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In course of the recent results from Wendelstein 7-X, stellarators are on the brink for assessing their maturity as a fusion reactor. To this end, stellarator specific transport regimes need detailed exploration both with appropriate systematic experimental investigations and models. A way to enhance the efficiency of this process is seen in an systematic evaluation of existing experimental data. We propose appropriate tools developed in information theory for examining large datasets. Information entropy calculations, that have proven to assist the systematic assessment of datasets in many other scientific fields, are used for novelty detection.
Potentially, as a first use-case of this holistic process, this thesis attempts to link and to develop approaches to examine the stellarator specific core-electron-root-confinement (CERC) regime. The specific interest for CERC emerges from the behavior of the radial electric field. While ion-root conditions exhibit negative radial electric fields, CERC’s positive field in the very core of fusion grade plasmas adds an outward thermodynamic force to high-Z impurities and could add to potential actuators to control impurity influx as to be examined for full-metal wall operation in large stellarators. Recently, this feature received revived intent for reactor scale stellarators.
Also, in this work, parameter regions close to the transition from ion-root to CERC are
examined. At lower rotational transform (a characteristic feature of the magnetic field confining fusion grade plasmas), transitions were detected when the plasma current evolved. As in smaller stellarators, it is concluded that low-order rationals and magnetic islands are related to the transitions. This is widely supported by extensive MHD simulations which finally provide indications for the role of zonal flow oscillations. As one of the outcomes, gyrokinetic instabilities are seen interacting for the first time with the neoclassical mechanisms in experiments.
In order to cope with the vast number of highly sampled spatio-temporal plasma data, new
techniques for novelty detection are required. Fundamental prerequisites for the detailed
physics investigations were the feasibility study of entropy-based data analysis techniques, and their adaptation to detect previously unrevealed transition mechanisms. These tools were applied to multivariate bulk plasma emissivity data, which allowed the exploration of large parameter spaces and provided insights in the spatio-temporal dynamics of CERC transitions.
In this manner, this research highlights the feasibility of information flow measure analysis in fusion studies. Applications of different entropy-based complexity measures are explored and this work sheds light on the capabilities, added value and limitations of these techniques. This investigation presents the integration of information flow measures to gain deeper understanding of plasma transport phenomena, by providing an approach to fast systematic data mining suited for real-time analysis. This work paves the way for further development and implementation of information-theoretic methods for plasma data analysis.
In summary, this research highlights the gained insight on CERC transitions, while showcasing the feasibility, added values and limitations of information flow measure analysis for fusion studies, to induce theory based analysis revealing new insights in fundamental, stellarator-specific transport mechanisms.
Global change is one of the major challenges our society faces in recent times and is becoming increasingly noticeable in all aspects of our lives. In the last ten years, reports about droughts in Europe increased, contrary to expected natural climate variations and are attributed as indicators of climate change. Droughts resulted in a severe decrease in water levels of lakes, rivers and reservoirs, posing socio-economic and environmental challenges. Climate scenarios by the Intergovernmental Panel on Climate Change (IPCC) project increasing temperatures, more frequent, longer and/or more intense heat waves and warm spells, and an increase in aridity with short-term droughts in the upcoming decades for Western and Central Europe. Some areas – such as Northeast Germany – are already affected by negative water balances and the lowering of lake and groundwater levels. Additionally to possible challenges in water availability, excess nutrients and heavy metals from industrial emissions, agricultural fertilisers and land use changes lead to declining water quality. In the past century, extensive eutrophication and environmental pollution have become major water quality issues in many freshwater bodies.
Nonetheless, water and its availability in a sufficient quantity and quality are prerequisites for life and must be prioritised in future development. The European Union aims for a good status in all surface and groundwater bodies by 2027 regarding their ecological, chemical and quantitative status. However, a profound understanding of eutrophication, pollution sources, and water bodies' reference conditions – referring to pre-anthropogenic conditions – should be available for each system to apply integrated restoration strategies. Moreover, an in-depth understanding of long-term climate variability and its dynamics is indispensable to approach these climate change challenges and reliably predict water availability.
During the past decades, numerous paleoenvironmental studies have been carried out on Northern German sediment archives, using mainly lacustrine sediments to reconstruct hydroclimatic variability, often inferring lake-level variations as key indicators. However, most studies were carried out in areas affected by more maritime or continental climate. Studies from the transition zone are rare. Only few existing studies offer high-resolution records and/or robust chronologies, which limits the understanding of past environmental changes significantly. Besides, the Northern German lowlands have been anthropogenically affected since at least the Neolithic (~5.6 ka cal BP) and, in particular, forest composition and density have recently been shown to have at least partially an impact on lake-level variations. However, a reliable distinction between climatic impacts and anthropogenic interferences is widely missing, which is a problem because many studies were conducted on rather small lacustrine systems in which expected anthropogenic signals are higher, and single events may overprint the climatic signals. These biases lead to an incoherent picture of the past hydroclimatic variability in Northern Germany during the Holocene. To overcome this situation, it is inevitable to identify a suitable sedimentary archive from the transition zone – preferably a large lacustrine system in which natural (supra-)regional paleoenvironmental signals are expected to be not overprinted by single events. Moreover, it is necessary to establish robust chronologies and apply high-resolution methods to infer past environmental changes in a high temporal resolution. Taken together, this could contribute to an enhanced understanding of past environmental and climatic changes in Northern Germany.
This thesis consolidates the evidence for Schweriner See to act as a suitable sedimentary archive in Northern Germany for (supra-)regional climate reconstructions. Schweriner See is a large lowland lake in Northern Germany located within the transition zone from maritime to continental climate. In the first step, (paleo)lacustrine landforms, i.e. beach ridges, subaerial nearshore bar, and a silting-up sequence, are investigated along the north-eastern shoreline using a combined approach of sedimentology (e.g. grain size variations) and the relatively novel method of luminescence profiling offering relative age determinations to understand depositional processes and their chronological framework. Absolute age information is mainly inferred by OSL dating. Secondly, an important prerequisite to interpreting information obtained from lacustrine sediment archives is a thorough understanding of processes controlling sedimentation. Schweriner See is characterized by a complex morphometry, which influences in-lake processes, i.e. i) in-lake productivity, ii) carbonate precipitation and iii) wind- and wave-induced processes, resulting in a distinct spatial heterogeneity. This thesis shows that it is crucial first to understand sedimentary depositional processes and controlling mechanisms to i) select suitable coring location(s) and ii) reconstruct paleoenvironmental and hydroclimatic variations reliably.
Based on bathymetric considerations and inferred in-lake processes, two main coring locations were identified to infer i) the anthropogenic impacts and ii) hydroclimatic variations. Short sediment records from the shallow water areas (< 15 m water depth) cover the most recent environmental history of Schweriner See. A well-dated sedimentary record (210Pb/137Cs and 14C dating) links distinct sedimentary and geochemical changes with historical events. Schweriner See was extensively affected by lake-wide eutrophication and contamination, closely related to sewage and population dynamics within the catchment. The water quality only improved after the German Reunification in 1990 CE when sewage was precluded from Schweriner See. Contamination trends at Schweriner See showed similar trends to different archives along the southern Baltic Sea, implying a common regional driving mechanism, e.g. environmental legalisation.
A well-dated sediment record from the profundal zone (52 m water depth) allowed the reconstruction of large-scale atmospheric conditions during the past 3 ka cal BP by inferring winter temperature variability, the moisture source region and/or evaporative lake water enrichment, which resemble variations in the North Atlantic Oscillation (NAO). The NAO greatly influences the Central European climate, affecting, for example, surface air temperature, precipitation or storm tracks. During 3-2.8 ka and 2.1-0.8 ka cal BP, predominantly positive NAO conditions are reconstructed, which are characterized by warmer winter temperatures, moisture conditions bringing isotopically enriched precipitation from the southern/central North Atlantic to Northern Central Europe and/or warmer temperatures that may result in a higher evaporative isotopic lake water enrichment as a result of northwards displaced westerlies. Conversely, during 2.8-2.1 ka and 0.8-0.1 ka cal BP, results correspond to predominantly negative NAO phases influenced by southwards displaced westerlies. Frequent atmospheric blocking allows for the intrusion of northerly or easterly winds, resulting in colder winter temperatures, isotopically depleted precipitation from the Northern Atlantic and Arctic region and/or a lower evaporative lake water enrichment. In addition to these long-term changes in atmospheric conditions, short-term hydroclimatic variations have been reconstructed, mainly reflecting lake-level variations in conjunction with precipitation variability, with the proxy signal being additionally amplified by wind speed and wave motion. Comparisons with other archives support these results.
So far, the paleoenvironmental reconstruction is limited to the Late Holocene, but initial dating results imply possible interferences until the Late Pleistocene. Therefore, future studies should focus on extending the profundal record from Schweriner See further back in time, providing a high-resolution record covering both the Holocene and possibly the Late Pleistocene.
Pregnancy involves adaptations of the cellular composition in utero to establish a functioning fetal-maternal interface. Different subsets of leukocytes populate the endometrium and contribute to tolerance of the fetal allograft while protecting it from potentially threatening infections or rejection. ¬¬Innate lymphoid cells are recently discovered immune cells that, besides the gut, lung and skin, possess immunoregulatory functions in the female reproductive tract, especially during gestation. Although present at the fetal-maternal interface, the dynamics of ILC migration during pregnancy remains poorly investigated. The involvement of homing receptors in ILC migration to the uterus was the main subject of the present work.
First, the expression of homing receptors on ILCs from miscellaneous organs was assessed across the course of murine pregnancy in vivo by means of flow cytometry. Then, their migratory capacity towards pregnancy-relevant chemokines was investigated in vitro. The impact of pregnancy related hormones on the migration and homing of ILCs was then analysed in vitro via migration assays.
The results confirm altered proportions of ILCs in utero and the altered expression of homing receptors in ILCs in pregnancy. Different murine lymphoid organs showed augmented expression of chemokine receptors and decreased levels of homing integrin α4β7 in the first trimester, suggesting enhanced migration patterns of ILCs during early pregnancy. Subsequently, migration assays were used to demonstrate the role of different chemokine ligands in enhancing ILC migration.
Eventually, the alterations in homing receptor expression were correlated with female pregnancy hormones. Progesterone treatment caused similar effects on homing receptor expression in ILCs as observed during early gestation. These results represent the first study evaluating the effect of sex steroid hormones on ILC chemokine receptor distribution.
Taken together, our results indicate the involvement of pregnancy-relevant chemokines, including CCL4, CCL20 and CCL28, in the recruitment of ILCs to the uterus during pregnancy. The data highlight an endocrinological-immune crosstalk in the regulation of ILC homing to the female reproductive tract. Gestation alters chemokine receptor expression in order to regulate the access of immune cell subsets to the fetal-maternal interface. An adequate regulation is highly needed, as a lack or abundance of different subgroups could result in pregnancy complications, including fetal loss, pre-eclampsia or pre-term birth. Thus, the role of ILC chemotaxis to the pregnant uterus and its regulation are of interest in the understanding, prevention and treatment of the clinically relevant obstetric diseases.
The combination of the Layer-by-Layer (LbL) method, a nano-material such as carbon nanotubes (CNTs), and charged polyelectrolytes (PEs) is a reliable approach to produce highly functionalized surface coatings. These coatings are stable, controllable, ultra-thin, and most importantly, biocompatible. The ability to tune their properties by varying the preparation conditions and the terminating layer opens up a wide range of applications in the fields of biology and medicine. Here, the goal was to create electrically conductive coatings on which cells grow and proliferate. To achieve this goal, a coating with a stable conductive film structure, a suitable film surface topography, and suitable surface potential (and 𝜁-potential) must be prepared.
At the beginning of this thesis, the focus was on the fabrication of electrically conductive multilayer films, whose electrical properties should be stable and adjustable in a controlled manner (Article 1). The combination of chemically modified CNTs as polyanions, a strong linear polycation like poly(diallyldimethylammonium chloride) (PDADMA), and the LbL-method allowed us to prepare such films. Their characterization was carried out in air at ambient conditions. Since PDADMA is non-conductive, the charge transfer within the film and thus the electrical conductivity itself depends mainly on the CNTs and their arrangement. It was found that four CNT/PDADMA bilayers (BL) were always necessary to create a lateral network structure with multiple CNT crossing points to enable and support electron transport within the film. Moreover, additional CNT/PDADMA BL resulted in decreasing sheet resistance, while the conductivity remained constant at ≈ 4 kS/m regardless of the number of bilayers. Increasing the PDADMA molecular weight (Mw) from 44.4 kDa to 322 kDa did not affect film properties such as thickness or electrical conductivity.
However, increasing the CNT concentration from 0.15 mg/ml to 0.25 mg/ml in the deposition suspension resulted in thicker and less conductive films. This is attributed to a faster adsorption process of the CNTs leading to more adsorption sites for the polycation. We found an increased PDADMA monomer/CNT ratio compared to films prepared with the lower CNT concentration in the deposition suspension. The electrical conductivity decreased by a factor of four down to 1.1 kS/m, which can be attributed to fewer contact points between the CNTs. Overall, we were able to prepare stable and electrically conductive multilayer films. Additionally, by varying the preparation conditions tuning of the electrical conductivity is possible.
To fulfill requirements regarding i.e., medical implants, film properties not only have to be stable and controllable in a dry state (described in Article 1) but also in a biological aqueous environment. Therefore, in Article 2 we immersed our coated samples in three different solutions usually employed in biological research and compared their properties with their dry state, respectively. Also, hydration/swelling effects that normally occur for polyelectrolyte multilayer films (PEMs) in solutions were investigated.
For the film preparation, PDADMA (Mw = 322 kDa) and a deposition suspension of modified CNTs with two different concentrations (0.15 mg/ml and 0.25 mg/ml), which aged for two years, were used. Independent of the CNT suspension concentration, it turned out that the film thickness of the samples, prepared from the aged suspension, decreased significantly compared to the film thickness previously measured in Article 1. As a cross-check a new and fresh CNT suspension was made, which allowed us to reproduce the film thickness described in Article 1.
These results indicated that something happened with the CNT suspension over a two-year period. An analysis via X-ray photoelectron spectroscopy (XPS) showed a decrease in the percentage of functional groups in the CNTs from the aged suspension. The loss of functional groups resulted in less negatively charged CNTs and thus in fewer adsorption sites for the polycation PDADMA. Consequently, the PDADMA monomer/CNT ratio decreased, which lowered the thickness per bilayer by a factor of three, compared to films prepared with a freshly prepared CNT suspension. The lower linear charge density of the aged CNTs also enhanced their hydrophobicity, which is, in combination with the electrostatic forces, another important factor for multilayer cohesion. In contrast to PEMs made from polycations and polyanions, no swelling of the films occurred when immersed in solutions. This can be attributed to the fact that the increased hydrophobicity of the CNTs and the hydrophobic nature of the PDADMA backbone prevent the incorporation of water into the multilayer film. In solution, the films slightly shrink (by ≈ 2 nm), which makes them even more compact. Yet they remain stable. The result is an increased electrical conductivity from 9.6 kS/m, in the dry state, up to 15.3 kS/m immersed in solutions. To summarize, we showed that by tuning the interpolyelectrolyte forces the swelling and the ensuing decrease of the electrical conductivity of the films can be prevented.
Regarding the application in biology and medicine, we must consider that long-term exposure of cells to nano-materials like CNTs could lead to damage and inflammation of adjacent tissue. Therefore, it is necessary to prevent direct contact between the electrically conductive multilayer, i.e., CNT/PDADMA film, and the cells. The solution to this problem is a biocompatible top film that covers the CNT/PDADMA multilayer completely and still provides a lateral surface structure that supports cell adhesion and proliferation. Additional layers consisting solely of PEs could provide such a top film.
In Article 3 we investigated the self-patterning of PEM films as function of deposition steps. After preparation in water, the films were dried, characterized in air, and in vacuum. The films were built with high and low molecular weight PEs. PDADMA was used as polycation and poly(styrene sulfonate) sodium salt (PSS) as polyanion. The observation via Atomic Force Microscopy (AFM) showed that films prepared with high molecular weight PEs are laterally homogeneous and form no patterns, due to the chain immobility. The flat surfaces are ineligible as a substrate for cell adhesion.
In contrast, films built with a short PSS, especially at Mw, PSS = 10.7 kDa, began to self-pattern after seven deposited PDADMA/PSS bilayers. With each additionally deposited bilayer, the surface got more and more structured, from grooves over stripes to circular domains. Increasing film thickness led to an increased lateral mean distance between the surface structures. Scanning Electron Microscopy (SEM) images showed that exposure to a vacuum resulted in a decrease in the film thickness attributed to water removal, while the mean distance between the domains increased. Thus, by using this self-pattering process we are able to prepare PEMs with a highly structured surface. By adding PDADMA/PSS bilayers, not only the CNT/PDADMA film can be covered completely, but also a suitable surface morphology for cells can be created. Controlling the number of deposited bilayers allows the preparation of suitable coatings for cells.
To further improve the interaction of the cell and coated substrate not only the lateral structure but also the interacting electrostatic forces between cells and substrate are important for the nature of cell adhesion, function, and proliferation. In Article 4 we investigated PEMs, consisting of strong PEs with a low (PDADMA) and high (PSS) linear charge density. We performed asymmetric force measurements with the help of the colloidal probe technique (CP). Here, the forces between a PEM-covered surface and a colloidal probe (silica sphere) glued to a cantilever were investigated. The colloidal probe was either bare or covered with polycation poly(ethylenimine) (PEI). The surfaces were immersed in NaCl solutions with different ionic strengths (INaCl), starting with deionized water, then enriched up to 1 mol/L NaCl. The interaction force between a CP and the surface was measured. Thus, insight into the surface potential/charge was obtained.
During film preparation, two growth regimes (parabolic and linear) exist. These regimes and the terminating layer determine the surface force of the PEM. PEMs with a terminating PSS layer are predominantly flat and negatively charged when the ion concentration is low and the film is in the parabolic growth regime (between 1 and ≈ 15 BL). This indicates charge reversal on PSS adsorption. At the transition point between the parabolic and linear growth regimes, the ratio between polyanion and polycation monomers starts to switch and some cationic monomers are neutralized not by anionic monomers but by monovalent ions. Therefore, the surface charge density in diluted NaCl solutions changed from slightly positive near the transition to positive in the linear growth regime. At the lowest ionic strengths (INaCL) the range of the surface potential goes from – 40.5 mV (9 BL, parabolic) up to + 50 mV (19 BL, linear).
In contrast, polycation (PDADMA) terminated films are overall positive in diluted NaCl solutions. At the beginning of the parabolic growth regime, the layers are more compact and flat. However, with each additional layer deposited, the film becomes less compact and the chains begin to loosen. The now more loosely bound chains start to protrude into the solution and form pseudo-brushes. This could already be observed for 10.5 BL.
It intensifies in the linear growth regime (begin at ≈ 15 BL) and results in steric surface forces. Changing the surrounding INaCl affects this behavior and the pseudo-brushes scale as polyelectrolyte brushes.
By controlling the number of bilayers (thus the growth regime), the surrounding ionic strength, and the conformation of PEs at the PEM surface, it is possible to prepare a suitable range of surface properties i.e., for cell adhesion and proliferation. To prove that these multilayers can provide a suitable surface and have a positive effect on cell behavior, we coated in Article 5 titanium-covered samples with PEMs. Investigated was the cell interaction with the surface at different zeta(ζ) - potentials, a parameter for dynamic surface potential. Here the cell activity is measured by the mobilization of calcium (Ca2+) within the cell as a function of the ζ - potential of the substrate and the externally applied electrical potential. The cell activity indicates if the ζ - potential, provided by the sample surface, is suitable or not for the cells. The favorable interaction with the substrate is also reflected in the cell morphology and proliferation. The results showed that highly negative ζ - potentials between - 90 and - 3 mV led to a decreasing/reduced Ca2+ mobilization which correlates with reduced cell activity. Nearly neutral to moderate positive surfaces (ζ - potential + 1 to + 10 mV) i.e., PSS-terminated PEMs are able to promote cell adhesion and growth as demonstrated by an increased Ca2+ mobilization. The access to the intracellular Ca2+ stores, provided by the external stimulus, is now more effective and suggests a higher cell activity. Increasing the ζ - potentials up to ≈ + 50 mV (highly positive), i.e., PDADMA - terminated PEMs with pseudo-brushes, resulted in restricted cell viability and impaired Ca2+ mobilization, which led to a disturbed cell morphology and proliferation. In conclusion, only surfaces, terminated with i.e., PEI, with moderate positive charges (ζ - potential + 1 to + 10 mV) are able to improve the Ca2+ mobilization and thus the cell activity and proliferation. PEMs with a PSS termination provide negative 𝜁−potentials, onto which cells adhere, and proliferate. Therefore, they are a good alternative for surface functionalization for implant surfaces. In summary, the objective set at the beginning of the thesis is addressed within articles written as part of this thesis. It is possible to fabricate PEMs with modified CNTs to produce coatings that are electrically conductive with tunable sheet resistance, whether dry in air or immersed in an aqueous solution (Articles 1 and 2). Also, for pure PEMs, it is shown that with the right molecular weight of PEs and a certain number of bilayers, a suitable surface structure for cell adhesion can be produced (Article 3). Additional surface properties such as a suitable surface charge density can be provided by PEMs which can improve the cell activity as monitored with Ca2+ mobilization (Articles 4 and 5). The next step is to combine the knowledge gained from Articles 1 – 5 and link it to the application of external electrical fields to cells.
In Zeiten von youtube und tiktok sind Musikvideos immer noch beliebte populäre Texte, die es gilt lesen zu können. Die Analyse von Musikvideos ist eine gute Übung in Visual Literacy, knüpft sie doch an die Lebenswelten junger Menschen an und durchdringt aufgrund der intertextuellen Zusammenhänge von Text, Musik, Bild und Celebrity Culture viele Bereiche des (pop-)kulturell geprägten sozialen Zusammenlebens.
Mit diesem Arbeitsblatt lässt sich die visuelle Ebene des Musikvideos, deren Komposition, Bedeutung und Interpretation in einfachen Schritten erarbeiten. Das Arbeitsblatt ist in englischer Sprache konzipiert und fördert so auch die Ausdrucksfähigkeit in derselben.
During infections, innate immune cells are crucial for initiating a pro-inflammatory immune response and clearing the invading pathogen. Delay in pathogen clearance or initiation of an immune response due to impaired functionality of immune cells can result in devastating consequences. The cellular compartment of the innate immune system comprises an array of specialized cell types: Macrophages are tissue-resident professional phagocytes that clear cellular debris, pathogens, and foreign objects. Dendritic cells (DCs) are immune sentinels specialized in antigen uptake and subsequent T cell priming. They are primary sources of cytokines in response to infection. Neutrophils are efficient effector cells that respond rapidly to infection and clear bacteria by different mechanisms. If effector mechanisms of these cells are affected by either bacterial or other factors, infections might not be resolved and can spread throughout the host. Cobalt-chromium-molybdenum biomaterial is widely used in arthroplasty. Implant-derived wear particles and ions lead to macrophage-driven adverse local tissue reactions: Such reactions have been linked to an increased risk of periprosthetic joint infection after revision arthroplasty. While metal-induced cytotoxicity is well characterized in human macrophages, direct effects on their functionality remain elusive. In Paper I, we show that local peri-implant tissue is exposed to Co and Cr in situ. Influx of macrophages is also evident. Exposure of isolated human monocytes/macrophages to Cr3+ in vitro had only minor effects. However, exposure of monocytes/macrophages to pathologic concentrations of Co2+ significantly impaired both phenotype and functionality. High concentrations of Co2+ induced loss of surface markers, including CD14 and CD16. Both Co2+ and Cr3+ impaired macrophage responses to Staphylococcus aureus infection. Co2+ -exposed macrophages, in particular, showed decreased phagocytic activity. These findings demonstrate the immunosuppressive effects of locally elevated metal ions on the innate immune response. Streptococcus pyogenes (group A streptococcus, GAS) causes a variety of diseases ranging from mild to severe necrotizing soft tissue infections (NSTIs). In the host environment hypervirulent GAS variants carrying mutations within the genes encoding for control of virulence (Cov)R/S two component system are enriched. This adaptation is associated with loss of SpeB secretion. In Paper II, we show that in vitro infections with hyper-virulent GAS variants harboring dysfunctional CovR/S suppress secretion of IL-8 and IL-18 by human monocytic cells. This phenotype was mediated by a caspase-8 dependent mechanism. Knockout of streptococcal SLO in a GAS strain carrying functional CovR/S even increased secretion of IL1β and IL-18 by moDCs. Of 67 fully sequenced GAS NSTI isolates, 28 contained covS or covR mutations that rendered the TCS dysfunctional. However, no differences in systemic IL-8 and IL-18 were detected in these patients. GAS isolates recovered from patients often display a mixed phenotype, consisting of SpeB positive (SpeB+ ) and SpeB negative (SpeB- ) clones. Irreversible loss of SpeB expression is often caused by loss of function mutations in regulatory components (CovR/S, RopB). Loss of SpeB is often associated with hyper-virulence. In Paper III, we show that the host environment induces transiently abrogated secretion of SpeB by GAS. Tissue inflammation, neutrophil influx, and degranulation correlated with increased frequencies of SpeB- GAS clones. Isolates recovered from tissue expressed but did not secrete SpeB, which was reversible. Neutrophilderived ROS were identified as the main factor responsible for abrogated SpeB secretion. Hyper-virulent SpeB- clones also exhibit better survival within and induce excessive degranulation of neutrophils.
Medieval texts reveal the normalised presence of Saami peoples in medieval Fennoscandia, suggesting close interactions involving trade, relationships, rituals, and magic. Despite growing recognition of these relations, the Saami remain overlooked in general studies of the Middle Ages, often relegated to symbolic roles or footnotes. As a result, Saami characters are typically depicted as the exotic Other within Norse society, often being stripped of agency and humanity in historical narratives. To counter these biases and distorted narratives, an essential step is analysing exclusionary structures in medieval literature and critically reviewing existing research on Saami representation. This process challenges dehumanising portrayals and confronts present-day stereotypes. The present study aims to ‘re-humanize’ (as Paulette F. C. Steeves puts it) the medieval Saami past by using decolonising frameworks and perspectives offered by the so-called ‘Indigenous turn’ of medieval studies, bridging medieval studies and Indigenous studies within a Norse context.
Semiosis is the process in which a sign unfolds its effect—the meaning that humans ‘suddenly’ see in acts, objects or facts. The semiotic tenet is applied to the event and the question of why we narrate it. The graphics are dedicated to the author’s contribution: ‘The event and its consequences: a semiotic analysis.’
Our study examined whether potentially critical indications from depression questionnaires, interviews, and single items on suicidal ideation among partici-pants in a large prospective population-based study are related to short-term sui-cides within one year. For this purpose, we studied the association between (a) the severity of depressive symptoms according to the M-CIDI and the PHQ-9, BDI-II, and CID-S depression screening and (b) elevated scores on single sui-cidal ideation items and mortality according to claims databases.
In the baseline cohort, the frequency of depressive symptoms measured by CID-S was 12.90% (SHIP-START-0). The frequency for “Moderate” to “Severe de-pression” measured by the PHQ-9 (≥ 10 points) and BDI-II (≥ 20 points) ques-tionnaires ranged from 5.40% (SHIP-LEGENDE) to 8.80% (SHIP-TREND Morbid-ity follow-up). The 1-month prevalence of unipolar depression, measured by the M-CIDI in SHIP LEGENDE, was 2.31%.
Between 5.90% (SHIP-TREND Morbidity follow-up) and 6.60% (SHIP-LEGENDE) of respondents showed a certain degree of suicidal ideation in the two weeks preceding the assessment, according to BDI-II and PHQ-9.
Our results show the high frequency of depressive symptoms in the study region, with women being affected more frequently than men, especially in the higher categories. Furthermore, women were more frequently affected by suicidal idea-tion, although this difference was not evident in the highest categories.
There was one potential suicide in the year after a SHIP examination.
From our results, we cannot conclude that severe self-reported symptoms from depression questionnaires should be reported back to participants of an obser-vational population-based study to prevent suicide deaths within one year.
Clear cell renal cell carcinoma is the most frequent malignant kidney tumor in adults. It is often associated with biallelic VHL mutations. We characterized our cell lines according to their HIF expression pattern. Cell lines RCC4, UOK-220 and CaKi-2 were assigned to subtype H1H2, cell lines 786-O and A-498 were assigned to subtype H2 and cell lines CaKi-1 and Rc-124 were assigned to subtype VHLwt.
Previous work of our group had shown, that p53 can be activated in ccRCC following irradiation but is not able to induce apoptosis. An important link to p53 activity with strong antiapoptotic qualities is the NFB pathway, which can be activated e. g. by irradiation.
We irradiated the three subtypes previously established as well as two control cell lines, SAOS-2 (p53 negative cell line) and HEK 293 (contains functioning p53) with 2 Gy and 10 Gy and analyzed several proteins of the pathway by using western blots. Several target genes with antiapoptotic qualities were analyzed by using rt-PCR.
We found, that out of the cell lines analyzed, both control cell lines (SAOS-2, HEK 293) showed the strongest response (activation of the NFB pathway) following irradiation. Among the three ccRCC subtypes the VHLwt cell lines showed the strongest response. H2 cell lines showed almost no response at all.
A connection between the missing ability of p53 to induce apoptosis and an induction of transcription factors by the NFB pathway could not be determined. We also could not determine biological differences between the subtypes.
We analyzed, whether any NFB proteins were present in the nucleus following irradiation and found, that only p50 homodimers were present in the nucleus. This might point towards p50 homodimers, which have been described to have different characteristics than heterodimers. More research is needed to analyze this important finding.
The maintenance of protein homeostasis in muscle by degradation systems, e.g. the autophagy lysosomal pathway (ALP) and the ubiquitin-proteasome system (UPS), is of great importance. It prevents the accumulation of nonfunctioning and not properly folded proteins, which can lead to protein aggregate myopathies (PAMs) and several other protein storage diseases. Degradation by the UPS depends on the transfer of ubiquitin to a target protein. This happens in a cascade of E1-E2-E3 proteins. This process is also involved in protein location and regulation of protein activity. E3 ligases are often tissue specific. Muscle RING-finger proteins (MuRFs) are a family of really interesting new gene (RING)-Finger E3 ubiquitin ligases, that are almost exclusively expressed in the striated muscle. They play a role in muscle wasting, but are also important for the maintenance of the structure of striated muscle. MuRF proteins are also involved in the regulation of the striated muscle energy metabolism. Previous work has demonstrated that MuRF1/MuRF3 DKO mice show a protein surplus myopathy characterized by an accumulation of myosin heavy chain proteins in striated muscles and a reduction in function of both heart and skeletal muscle. The aim of this study was to test the hypothesis that the myopathic phenotype of MuRF1/MuRF3 DKO mice is mediated by a disturbed energy homeostasis in the heart and skeletal muscle, with focus on mitochondrial function. Because sex-specific differences have not been investigated in these mice so far, a further aim was to investigate any differences between male and female mice.
To test these hypotheses, we measured the weight of the heart and the hindlimb muscles tibialis anterior and soleus to detect a possible hypertrophy in the DKO mice. Hematoxylin and eosin staining of histological cross sections of the tibialis anterior were performed to investigate protein accumulations. Muscle function was quantitated via grip strength and specific force measurements. Possible changes in protein amounts were detected via mass spectrometry analyses and western blot analyses. Changes in gene expression were investigated by qRT-PCR. Coimmunoprecipitation was used to determine direct interactions between proteins. Protein stability and ubiquitination were investigated by cycloheximide (CHX) and ubiquitination assays, respectively.
DKO mice showed an increase in heart and skeletal muscle weights. Grip strength assays revealed limb weakness of DKO mice. H&E staining of histological cross sections of the tibialis anterior muscle (TA) showed protein aggregates within myofibers. Mass spectrometry analyses of proteins isolated from TA and heart muscle revealed an increase of muscle stress markers and structural proteins in DKO mice, while proteins involved in the energy metabolism were reduced. Especially interesting here were the proteins of the mitochondrial electron transport chain (ETC), which play a major role in the energy production of the mitochondria by catalyzing the phosphorylation of ADP to ATP, the universal energy carrier in all living organisms. These changes were more pronounced in TA compared to heart. Western blot and qRT-PCR results of ETC subunits supported our proteome data. They also revealed a sex-specific difference, in which the reduction ETC subunits was more pronounced in females than males. In female
TA NDUFB8, SDHB, UQCRC2, MTCO1 and ATP5 were significantly reduced compared to controls, while only UQCRC2 and ATP5 were decreased in male TA compared to controls. A significant reduction in gene expression of Ndufb8, Sdhb, Mtco1 and Atp5 was detected in TA of female mice compared to controls, while only Ndufb8, Sdhb and Atp5 were decreased in male TA compared to controls. We observed the same pattern in Heart of male (protein: NDUFB8; mRNA: Mtco1) and female (protein: UQCRC2, MTCO1, ATP5; mRNA: Sdhb, Mtco1) DKO mice compared to their controls. The reduction in ETC subunits was paralleled by a reduction in complex I and complex III activity in the TA of DKO mice, but not in heart. However, this was only significant in the TA of female but not male mice. Mechanistical analyses using coimmunoprecipitation, cycloheximide chase and ubiquitination assays showed that MuRF1 physically interacted with the transcriptional repressor histone deacetylase 5 (HDAC5), mediated its ubiquitination as well as its UPS-dependent degradation. The absence of MuRF1 and MuRF3 in DKO mice let to an increase in the amounts of HDAC5 in TA. Because HDAC5 binds to PGC-1α, the master regulator of mitochondrial biogenesis (encoded by Ppargc1a), we investigated its gene expression in DKO muscle and found it to be reduced.
These data connect MuRF1 and MuRF3 directly to the striated muscle energy metabolism, by regulating mitochondrial function. The results provide insights into the development of PAMs and possibly other protein storage diseases, where a decrease of mitochondrial function has already been described.
With high prevalence and mortality, myocardial infarction constitutes a social and economic burden in Germany and worldwide. Current guidelines for MI treatment require prompt reperfusion to salvage heart tissue and minimize short- and long-term complications. However, there are currently no treatments available to attenuate reperfusion injury. Ischemic as well as pharmacological post-conditioning have been identified as important clinical strategies to improve outcome. Membrane stabilizers, like Poloxamer 188 (P188), have been shown to improve myocardial ischemia reperfusion (IR) injury and mitochondrial function but have not yet been proven to directly offer mitochondrial protection. Mitochondrial function is crucial for cardiomyocyte function, and mitochondrial dysfunction plays an important role in myocardial injury.
In this study, hearts from 79 Sprague Dawley rats were isolated and perfused ex-vivo with oxygenated Krebs Buffer for 20 min before 30 min of no-flow ischemia. Hearts were reperfused for 10 min with Krebs buffer or 1 mM P188. Cardiac mitochondria were isolated with 1 mM P188 vs 1 mM polyethylene glycol (PEG) vs vehicle by differential centrifugation. Mitochondrial function was assessed as adenosine triphosphate (ATP) synthesis, oxygen consumption and calcium retention for complex I and II substrates of the respiratory chain.
An improvement of myocardial function with 10 min P188 post-conditioning could not be shown. Direct mitochondrial protection of P188 or PEG could not be observed in this model either. Further research is needed to ascertain whether P188 has a direct protective effect on mitochondria and, if so, on what pathways of IR injury it acts.
This anthology is about the representations and uses of medieval saints, heroes, and heroic events as elements of popular, local, and national culture during the 19th and 20th centuries in the Baltic Sea region: Scandinavia, Finland, Baltic countries, Northern Germany and North-Western Russia. Authors examine the processes of how medieval saints and heroes have been remembered, commemorated, interpreted, used, and reflected during modernity, and by whom. The focus of the anthology is on "doing" memory as a practice that commemorated the past and shaped spaces and identities in the present. It approaches the memory of saints and heroes, for example, Swedish Saints Birgitta and Eric, Danish Saint Knud, Kyivan Princess Olga, Swedish military leader in Finland Tyrgils Knutsson, Liv/Latvian warrior Imanta and Holsatian count Gerhard III as a shared heritage and as part of national, local and popular culture. The anthology contributes to the understanding of the Baltic Sea region through the study of saints, cults and heroic representations in the longue durée between the Middle Ages and modernity. It also adds nuance to the use of popular concepts of memory studies, particularly an update of Pierre Nora’s lieux de mémoire.
Numerous insertions of mitochondrial DNA in the genome of the northern mole vole, Ellobius talpinus
(2024)
Background
Ellobius talpinus is a subterranean rodent representing an attractive model in population ecology studies due to its highly special lifestyle and sociality. In such studies, mitochondrial DNA (mtDNA) is widely used. However, if nuclear copies of mtDNA, aka NUMTs, are present, they may co-amplify with the target mtDNA fragment, generating misleading results. The aim of this study was to determine whether NUMTs are present in E. talpinus.
Methods and results
PCR amplification of the putative mtDNA CytB-D-loop fragment using ‘universal’ primers from 56 E. talpinus samples produced multiple double peaks in 90% of the sequencing chromatograms. To reveal NUMTs, molecular cloning and sequencing of PCR products of three specimens was conducted, followed by phylogenetic analysis. The pseudogene nature of three out of the seven detected haplotypes was confirmed by their basal positions in relation to other Ellobius haplotypes in the phylogenetic tree. Additionally, ‘haplotype B’ was basal in relation to other E. talpinus haplotypes and found present in very distant sampling sites. BLASTN search revealed 195 NUMTs in the E. talpinus nuclear genome, including fragments of all four PCR amplified pseudogenes. Although the majority of the NUMTs studied were short, the entire mtDNA had copies in the nuclear genome. The most numerous NUMTs were found for rrnL, COXI, and D-loop.
Conclusions
Numerous NUMTs are present in E. talpinus and can be difficult to discriminate against mtDNA sequences. Thus, in future population or phylogenetic studies in E. talpinus, the possibility of cryptic NUMTs amplification should always be taken into account.
Changes in the microcirculation of the skin are a frequently observed accompanying phenomenon of many diseases, far beyond the spectrum of dermatological diseases. Not all of these changes are pathological, many are transient and have no serious consequences. This is true for many inflammatory diseases such as psoriasis vulgaris or atopic eczema.
However, there are also diseases in which functionally and morphologically recognizable microangiopathies lead to severe disease consequences. One of the most important diseases in this context is systemic sclerosis, an autoimmune systemic disease with multiple organ manifestations. Investigations of the cutaneous microcirculation are of great importance for the initial diagnosis as well as for prognosis and assessment of disease progression.
In peripheral hemodynamic disorders such as peripheral arterial disease (PAD) and chronic venous insufficiency (CVI), understanding microcirculatory disturbances also plays an important role in therapy and in monitoring the success of therapeutic interventions.
Materials and Methods:
Literature search was conducted using electronic MEDLINE/ Cochrane databases, relevant references, citations and hand search was conducted. Academic Colleges were contacted to identify relevant studies and full texts. Inclusion Criteria were Randomized clinical trials, human cohort and case series reporting increasing vertical dimension and restoring worn dentition in adults suffering from tooth wear using fixed, minimal invasive and adhesive techniques.
The search period spanned from 2000 up to January 2023. Of the 550 articles identified, 111 went throw full text screening for eligibility and 12 studies were included in our study.
Failure, follow-up period for all the studies were assessed. Attrition , Bruxism, increase of vertical dimension rates and mean time of failure were calculated using random effect models.
Results:
Tooth wear was reported equally in anterior and posterior region, and restorations were done in direct and indirect manners, mostly with pre-evaluation of the needed increase of vertical dimension. The mean of increased vertical dimension was 2.3 mm. The mean observation time of the restorations was 41.3 months with a minimum observation period of 12 months and a maximum of 84 months. Failure rate of all the included studies was 9.9% (95% CI: 91.00 % to 95.80%) high heterogeneity was detected in Failure rate with I2 of (93.85). Time to fail was calculated to be 37.5 months for 2458 cases (95% CI:32.32 to 91.13%). A fixed effect model was performed to calculate the event of increasing vertical dimension , the event rate was 81.72% (95% CI: 0.00 to 88.10%).
Conclusion:
The performance of direct and indirect restorations is satisfactory, and the failure rate is low, which leads us to conclude that these non-invasive restorations are a reliable and cost-effective middle-term treatment method to restore vertical dimension in moderate to severe worn dentition.
Conflict of interest: None
In their idealized forms, enzymes can facilitate complex reactions with extreme specificity and selectivity. Additionally, in this imaginative form, they only require mild reaction conditions, resulting in low energy consumption, and they are biodegradable, efficient, reusable, and sustainable. Unfortunately, this idealized form often deviates significantly from reality, where enzymes are more likely to be associated with marginal stability and low reaction rates, leaving them less than desirable for many industrial applications. As such, if we could master the process of engineering the configuration of a protein towards a given task, the implications could be staggering.
This thesis aims to contribute to the process of protein engineering, mainly how computational tools can be used to make the protein engineering process more efficient and accessible.
Article I explores the current state of the art in machine learning-guided directed evolution and serves as a foundation for Article II, which is a concrete application of these techniques to an engineering campaign. Despite successfully improving overall activity and selectivity, we also observe limitations and constraints within the methodology. Article III then delves into these drawbacks and attempts to lay the foundation for a more generalizable and, more importantly, efficient engineering workflow, balancing the strengths and weaknesses of computational techniques with advances in gene synthesis. We then validated this novel pipeline in Article IV, where we show the potential of this methodology. Article V describes a more standard protein engineering campaign on squalene-hopene cyclases for potentially interesting products in the flavor and fragrance industry. Lastly, Article VI outlines a PyMol plugin for molecular docking.
Responses of bovine and human neutrophils to members of the Mycobacterium tuberculosis complex
(2023)
PMN are one of the most important cells of the innate immune system and are responsible for fast clearance of invading pathogens in most circumstances. The role of human PMN during mycobacterial infection have been widely studied. Nevertheless, there are contradicting results regarding their role in protection or pathology during TB. Similar studies focusing on bovine PMN and their role in M. bovis infection remain understudied. Also, not much is known about attenuation of M. tb in cattle and responses of PMN to this MTBC member.
The major aims of this study were to i) gain insights into bovine PMN biology and the cellular processes triggered by challenge with virulent mycobacteria and to ii) find out whether interspecies differences result in different outcomes upon in vitro challenge. In the first part of the work, a new isolation method for bovine PMN from whole blood was developed. Human and bovine PMN have different buoyant properties and hence need to be isolated using different procedures. The magnetic isolation method developed within this thesis is robust and results in very good yields of highly pure, viable bovine PMN populations. This is extremely advantageous and indispensable for downstream functional assays that are required to be performed on a single day.
The second goal of this study was to compare and contrast the functional differences between bovine and human PMN upon BCG infection. The findings reveal for the first time that human PMN phagocytose more BCG in comparison to bovine counterparts. Non-opsonized bacteria were internalized via the lectin-like C-domain, require cholesterol and an active cytoskeleton in human PMN, whereas opsonized bacteria entered cells via the CR3 and, in particular, CD11b. It remains unresolved why bovine PMN reacted differently, notably phagocytosis remained unaltered, to various treatments, including blocking monoclonal antibodies to CD11b and chemical inhibitors altering the cell membrane. Nonetheless, the increased uptake of BCG by human PMN correlates to more potent response of these cells in functional assays in comparison to bovine PMN. No PMN intrinsic differences were found in the basal cholesterol content. Comparative assays with the virulent strains would be essential in order to generalize these observations.
The third aim was to investigate the responses of bovine PMN to BCG, M. tb and M. bovis. While there was no difference in uptake between BCG and M. tb, serum opsonized BCG was taken up at a higher amount. This finding suggests differential binding of bacterial epitopes to host cell receptors which modulates mycobacteria uptake. However, between the virulent strains M. tb and M. bovis, the human-adapted bacillus was phagocytosed at a higher rate which hints towards the possibility of rapid recognition and clearance of M. tb in bovine host thereby possibly preventing pathology. The release of selective cytokines by PMN post infection with the virulent strains offers baseline information relevant for processes that probably occur in vivo. This work for the first time provides insights into responses of bovine PMN to mycobacteria in a two-tier approach: by cross-species analysis of PMN responses to selected mycobacterium and by head-to-head analysis of bovine PMN to animal-adapted and human-adapted mycobacteria.
As a prospect for future research in bovine PMN biology in the context of mycobacterial infection, it would be highly advantageous to compare the subcellular localization of M. tb and M. bovis in bovine PMN using confocal and/or electron microscopy. This analysis would confer proof on attachment or internalization of mycobacteria by PMN and identify the features of the mycobacteria-containing compartments. Also, in-depth investigations of additional entry pathways for the pathogen in bovine cells would be informative for unlocking downstream cell signaling events. In addition, PMN viability studies will be meaningful particularly in bovine PMN challenged with M. bovis and M. tb, given the impact of death patterns on tissue pathology. Current results and follow up studies will contribute to the understanding of the roles of PMN in controlling elimination or growth of M. bovis and M. tb in cattle.
Objective
Alexithymia is associated with various mental and physical disorders. Some rare evidence also suggested high alexithymia to affect the HPA axis based on small and selective samples. It was aimed to investigate the impact of alexithymia on basal cortisol levels in a large population-based cohort.
Methods
In a sample of N = 3444 individuals from the Study of Health in Pomerania (SHIP-TREND-0), the effect of alexithymia on basal serum cortisol levels was investigated in a cross-sectional design.
Multiple linear regressions utilizing cortisol levels as the response variable and alexithymia as the predictor of interest were calculated, while adjusting for conven-tional confounding covariates including depression. Multiple stratified, moderation and mediation analyses were performed to validate the results.
Results
Alexithymia was not significantly associated with basal cortisol levels (b = 0.23, 95 percent confidence interval (CI) of [-0.24, 0.69]; sr2 = 0.00, CI: [-0.00, 0.00]).
Sex- and age-stratified regression analyses as well as dichotomized models of non-alexithymic and alexithymic individuals substantiated the non-significance.
Additional mediation analyses with (1) depression and (2) physical health (R2 > 1 in both cases) and moderation analysis regarding the interaction of physical health and alexithymia (b = -1.45, 95 percent confidence interval (CI) of [-6.13, 3.32]; sr2 = 0.00, CI: [-0.00, 0.00]) corroborated the results.
Conclusion
This study does not support previous findings as it shows no association between alexithymia and basal cortisol; however, a consideration of the circadian rhythm, stress exposure or specific sample compositions heeding the methodological design should be the subject of further research.
In this work, 2-dimensional measurements in the THz frequency range with self-made spintronic THz emitters were presented. The STE were used to optimize the spatial resolution and determine the magnetization in geometric shapes. At the beginning, various combinations of FM and NM layers were produced and measured to achieve an optimal composition of the STE. The layer thickness of the ferromagnetic CoFeB layer and the nonmagnetic PT layer was also varied. The investigations have shown that a layer combination of 2 nm thick CoFeB and 2 nm thick Pt, applied to a fused silica glass substrate and covered with a 300 nm thick SiO2 layer, emits the highest THz amplitude. Based on these, a structured sample, consisting of an STE and an additional layer system of 5 nm Cr and 100 nm Au, was produced. Further, three wedge-shaped structures were removed from the gold layer by an etching process so that the THz radiation generated by the STE can pass through these areas. This enables the optimization of the resolution of the system. For this purpose, the sample was moved perpendicular to the laser beam by two stepping motors with a step size of 5 μm and imaged 2-dimensionally. By reducing the step size to 0.2 μm, the beam diameter could be measured at the edge of the structure using the knife-edge method. Based on this measurement, the resolution of the system could be determined as 5.1 ± 0.5 μm at 0.5 THz, 4.9 ± 0.4 μm at 1 THz, and 5.0 ± 0.5 μm at 1.5 THz. These results are confirmed by simulations considering the propagation of THz wave packets through the SiO2. The expansion of the FWHM of the waves, passing through the 300 nm thick layer, is about 1%. Only a SiO2 layer with a thickness in the μm range occurs an expansion of around 10%. This shows that it is possible to perform 2-dimensional THz spectroscopy with a resolution in the dimension of the exciting laser beam by using near-field optics. Afterward, the achieved spatial resolution was used to investigate the influence of external magnetic fields on the STE and the emitted THz radiation. By implementing a pair of coils above the sample, an external magnetic field could be applied parallel to the pattern. The used sample was designed in such a way that only certain geometric areas on the fused silica glass substrate were coated with an STE so that THz radiation is emitted only in those areas. The 2-dimensional images show the geometric structures for f = 1.0 THz and f = 1.5 THz clearly. By applying a permanent, positive magnetic field (+M), a positive course of the THz amplitude can be seen. A rotation of the magnetic field by 180° (-M) leads to a reversal of the orientation of the emitted THz radiation, whereby the magnetic field does not influence the corresponding frequency spectrum. By using minor loops, the sample was demagnetized by the constant reduction of the magnetic field strength with alternating magnetic field direction. The 2-dimensional representation of the pattern with a step size of 10 μm shows that the sample was demagnetized since both, positively and negatively magnetized structures, could be imaged. In addition, in the 2nd row from the top, a completely demagnetized circle and a rectangle with a division into two domains can be seen. These structures have both positive and negative magnetized areas, which are separated by a domain wall. To investigate this in more detail a 2-dimensional measurement of the divided regions was made with a step size of 2.5 μm. These images confirm the division of the structures into positive and negative domains, separated by a domain wall, which was verified by Kerr-microscope measurements. Both data show a similar course of the domains and the domain wall. However, to be able to examine the domain wall more precisely using 2-dimensional THz spectroscopy, the resolution of the system must be improved to a range of a few nm, because the expected domain wall width is between 𝑙𝑊 = 12.56 nm and 𝑙𝑊 = 125.6 nm. The improved resolution would make it possible to image foreign objects, such as microplastics in biological cells or tissue. For this purpose, different plastics, such as polypropylene, polyethylene, and polystyrene, were investigated in the THz frequency range up to 4 THz. While no specific absorption could be determined for PP, characteristic absorption peaks were found for PE and PS. The energy of the photons with a frequency of about 2.2 THz excites lattice vibrations in the PE. Therefore, this frequency is specifically absorbed, and the intensity in the transmission spectrum is lower than for other frequencies. PS absorbs especially THz radiation with a frequency of 3.2 THz. In addition, all of the investigated plastics are mostly transparent for THz radiation, which makes imaging of these materials feasible. Based on these basic properties, it will be possible to image and identify these types of plastic.
Until today, more than 17% of the population in Mecklenburg Western-Pomerania suffer from chronic kidney disease (CKD) which was revealed by the SHIP study (Study of Health in Pomerania). 20% of CKD cases can be traced back to glomerulopathies. One common characteristic of glomerulopathies is the morphologic change of the glomerular filtration barrier which consists of endothelial cells, the glomerular basement membrane and podocytes. Under healthy conditions, the foot processes of the podocytes interdigitate with the foot processes of the neighboring podocytes with a filtration slit in between. Apart from the slit membrane protein nephrin, typical adherens junction proteins like occludin or JAM-A are also expressed at this cell-cell junction. This junction is therefore considered to be a specialized type of adherens junction, necessary to maintain the size-selectivity of the filtration barrier. During podocyte injury, podocyte foot processes lose their characteristic morphology and the typical meandering filtration slit becomes linearized, a process which is described as foot process effacement.
Since morphological change is directly linked to change or loss of function, ultrastructural analysis of the foot processes is necessary for diagnostics and research. By using 3D-structured illumination microscopy (3D-SIM), we quantified these morphological changes as well as studied a possible biomarker, the tight junction protein claudin 5 (CLDN5). Our study showed a spatially restricted up-regulation of CLDN5 in effaced filtration slit areas in biopsies of patients suffering from minimal change disease (MCD), focal and segmental glomerulosclerosis (FSGS) as well as in mice after NTS injection and in the uninephrectomy DOCA-salt mouse model. CLDN5/nephrin ratios of biopsies from patients with glomerulopathies and of tissue received from NTS-treated mice were significantly higher compared to controls. We found that in patients the CLDN5/nephrin ratios were negatively correlated with the filtration slit density. Since CLDN5 up-regulation was observed in several areas of high filtration slit density, we hypothesized that CDLN5 upregulation preceded visible foot process effacement. Taken together, we suggest that CLDN5 could be a helpful biomarker to identify an early change of the foot process morphology in addition to filtration slit density measurement. Additionally, correlation analysis of foot process effacement with patient data showed a significant negative correlation of the filtration slit density with proteinuria in MCD patients.
Tafazzin is an acyltransferase with key functions in remodeling of the mitochondrial phospholipid cardiolipin (CL) by exchanging single fatty acids species in CL. Tafazzin-mediated CL remodeling determines the actual CL compositions and has been implicated in mitochondrial morphology and function. Thus, any deficiency of tafazzin leads to altered fatty acid composition of CL which is directly associated with impaired mitochondrial respiration and ATP production. Mutations in the tafazzin encoding gene TAZ, are the cause of the severe X-linked genetic disease, BARTH syndrome (BTHS).
Previous work provided first hints on a linkage of CL composition and subsequent limitations in the cellular ATP levels which may contribute to the restriction of growth. However, in C6 cells ATP levels remained unaltered due to compensatory activation of glycolysis. Moreover, it has been demonstrated that the substantial changes in CL composition are similarly resulting from knocking down either cardiolipin synthase (CRLS) or TAZ. This has also been shown in C6 glioma cells. Most notably only the knock down of TAZ, but not that of CRLS, compromised proliferation of C6 glioma cells. Therefore, a CL- independent role of TAZ in regulating cell proliferation is postulated.
In this study, any linkage of the lack of tafazzin to cellular proliferation should be investigated in more detail to allow first insight into underlying mechanisms.
The results of the current study demonstrate that the tafazzin knockout in C6 glioma cells show changes in global gene expression by applying transcriptome analysis using the- microarray Clarion S rat Affymetrix array. Out of 22,076 total number of genes detected, 1,099 genes were differentially expressed in C6 knockout cells which were either ≥2 and ≥4 fold up or down regulated genes. Furthermore, expression of selected target genes was validated using RT-qPCR. We have hypothesised that the changes in TAZ dependent gene expression is via PPAR transcription factor. According to eukaryotic promoter database (EPD) for selected target genes, exhibited at least one putative binding site for PPARG and PPARA transcription factors. However, pioglitazone and LG100268, synthetic ligands of PPARG and RXR, could not show any effect on changes in gene expression in C6 TAZ cells. Another class of cellular lipids, oxylipins were found to occur in significantly higher amounts in C6 TAZ cells compared to C6 cells which makes them candidates for mediating cellular effects and regulating gene expression via PPARs. A computational tool CiiiDER was used to for the prediction of transcription factor binding site. The transcription factors enriched in TAZ- regulated genes were found to be HOXA5 and PAX2, binding sites of which could be detected in 100 % of TAZ- regulated genes (>2-fold). By applying IPA to the differentially expressed genes we could identify lipid metabolism, and cholesterol superpathway in particular as the most affected pathway in C6 TAZ cells. This pathway consists of 20 genes, of which all (20/20) appeared to be differentially regulated in C6 TAZ cells. Of all the 20 genes, 4 of the differentially expressed genes were selected for further validation by RT-qPCR. By IPA it was possible to identify the upstream regulators that might be responsible for the differential expression of genes in C6 deficient cells. Some of the genes ACACA, HMGCR, FASN, ACSL1, 3 and, 5 identified was decreased by predicted activation and inhibition of the regulators. Further we have analysed the levels of cellular cholesterol content in C6 and C6 TAZ (w/o Δ5 and FL) cells. In C6 cells cholesterol is present more in its free form. C6 TAZ cells have increased amount of cholesterol compared to C6 cells. However, Δ5 and FL expressed C6 TAZ cells showed less amount of cholesterol.
Previous work established that knockout of tafazzin in C6 cells showed decreased cell proliferation in the absence of any changes in ATP content. To understand this phenomenon cellular senescence associated β-galactosidase in C6 and C6 TAZ cells was performed. C6 TAZ cells showed increased percentage of β-gal positive cells compared to C6 cells. Moreover, senescent associated secretory phenotype (SASP) represented by e.g. CXCL1, IL6, and IL1α was determined using RT-qPCR. Gene expression of these SASP factors was significantly upregulated in C6 TAZ cells.
Several human tafazzin isoforms exists due to alternate splicing. However, whether these isoforms differ in function and in CL remodelling activity or specificity, in particular, is unknown. The purpose of this work was to determine if specific isoforms, such as human isoform lacking exon 5 (Δ5), rat full length tafazzin (FL) and enzymatically dead full length tafazzin (H69L), can restore the wild type phenotype in terms of CL composition, cellular proliferation, and gene expression profile. Therefore, in the second part, it was demonstrated that expression of Δ5 to some extent and rat full length tafazzin can completely restore CL composition, in C6 TAZ cells which is naturally linked to the restoration of mitochondrial respiration. As expected, a comparable restoration of CL composition could not be seen after re-expressing an enzymatically dead full-length rat TAZ, (H69L; TAZ Mut). Furthermore, re-expression of the TAZ Mut largely failed to reverse the alterations in gene expression, in contrast re-expression of the TAZ FL and the Δ5 isoforms reversed gene expression to a larger extent. Moreover, only rat full length TAZ was able to reverse proliferation rate. Surprisingly, the expression of Δ5 in C6 TAZ cells did not promote proliferation of the wild type. Different effects of Δ5 and FL on CL composition and cell proliferation points to the specific and in part non-enzymatic functions of tafazzin isoforms, but this certainly requires further analysis.
A long-standing controversy in emotion research concerns the question whether stimuli must be conceptually interpreted, or semantically categorized, to evoke emotional reactions. According to the semantic primacy hypothesis, the answer to this question is positive; whereas according to the affective primacy hypothesis, it is negative: Emotions can also be, and perhaps often are, elicited by preconceptual stimulus representations, such as particular shapes or color patterns.
In the present dissertation project, the semantic primacy hypothesis was tested in eight experiments using different latency judgment paradigms in which the perceptual latencies of object recognition and affect onset were measured and compared. The chronometric measurement methods comprised temporal judgments (temporal order judgments and simultaneity judgments: Publication A, Experiments 1–4; the rotating spot / rotating clock hand method: Publication B, Experiments 1–2) and speeded reaction time measurements (Publication C, Experiments 1–2). To elicit affective responses, pictures of pleasant (e.g., cats, children) and unpleasant objects (e.g., spiders, moldy food) from everyday life were presented.
According to the semantic primacy hypothesis, object recognition is a necessary partial cause of affect. This implies the following three predictions that were tested in the studies: (1) Because causes must precede their effects, the time of the onset of object recognition must precede the time of the onset of affect. (2) The longer it takes a person to recognize an object, the longer it should also take them, other factors constant, to experience affect; therefore, the latencies of the two mental events should be positively correlated across individuals. (3) An experimental manipulation that delays the onset of object recognition (in this case a moderate blurring of the pictures) should also delay the onset of affect, and the effect of the manipulation on affect latency should be mediated by the delay in object recognition.
In agreement with Prediction 1, regardless of the chronometric method used, the latency of object recognition consistently proved to be shorter than the latency of affect onset. According to the meta-analytically integrated latency differences estimated in the temporal judgment experiments, affect followed object recognition with a delay of 117 ms. This result was obtained for both pleasant and unpleasant stimuli and was independent of task order. Supporting Prediction 2, the latencies for object recognition and affect onset were positively correlated across participants (meta-analytic r = .50). Supporting Prediction 3, delaying object recognition by blurring the affective pictures was found to also delay the onset of affect and the effect of blurring on the latency of affect was found to be partly mediated by delayed object recognition.
Two additional predictions tested and confirmed in Experiment C2 were: (4) False-coloring the affective pictures delays the onset of affect but not object recognition, and this effect is mediated by reduced affect intensity. (5) Judgments of the valence of the stimuli (i.e., whether the imaged object is pleasant or unpleasant) take more time than reports of object recognition, but less time than affect onset reports, for which valence judgments have often been used as a substitute in previous studies.
Taken together, the results of the eight experiments provided consistent support for semantic primacy in the generation of pleasant and unpleasant feelings evoked by affective pictures: Object recognition can be considered a necessary partial cause of affect in the reported experiments. The results are compared to previous findings, possible reasons for deviant response patterns found in a small minority of the participants are considered, and several implications of the findings for emotion research are derived. Possible adaptations of the chronometric approach to investigate other questions of emotion research are suggested. Finally, limitations of the dissertation project are pointed out and possible ways to address these in future research are proposed.
The present study deals with the spread and population genetics of the invasive Asian bush
mosquito Ae. japonicus in Europe and Germany. Since the first detection of Ae. japonicus
in Europe in 2000, the species spread rapidly through Europe, either actively by flying or
passively by human activities. In 2017, four confirmed populations of Ae. japonicus existed
in Europe. The largest population covered western Germany, parts of France, Switzerland,
Liechtenstein, Austria and Italy. The most northern population around Hanover, Germany,
did not spread since 2013. A very small population existed in Belgium and the second largest
population covered parts of Austria, Italy, Slovenia, Croatia and Hungary. By 2019, Ae.
japonicus had established in 15 European countries.
Most of the monitoring programmes in Europe dealing with the distribution and spread of
Ae. japoncus investigate cemeteries for juvenile stages. However, activities are not
harmonised, e.g. regarding numbers of investigated collection sites and declaration of
negative sites, making data comparison between different studies difficult. Therefore,
suggestions for a standardised Ae. japonicus monitoring method have been developed and
provided.
In the present study, 445 individuals of Ae. japonicus originating from five different
European countries were investigated for population genetic analyses by sequencing parts
of the nad4 gene and genotyping seven polymorphic microsatellite loci. In total, 16 different
nad4 haplotypes were identified with haplotype H1 being the most common and widespread
one through all populations.
Within Germany, Ae. japonicus has been spreading immensely over the last decade. Even
though the present results (2017) demonstrate incipient genetic admixture of populations as
compared to previous studies (2012-2015), no complete genetic mixture has taken place yet.
The populations of Ae. japonicus still fall into two genetic clusters, but the genetic diversity
on individual level had increased considerably (from three nad4 haplotypes in 2012 to 12
according to the present thesis). Both additional introductions and mutation are possible
reasons, but determining the origin of the German populations is not possible anymore.
In the years following the invasion of Germany, Ae. japonicus spread to southeastern
Europe. In 2013, it established in Croatia, in 2017 in Bosnia and Herzegovina and in 2018
in Serbia. In the current study, immature stages of Ae. japonicus were found at 19 sites in
Croatia, two sites in Bosnia and Herzegovina and one site in Serbia. The population genetic
analyses indicate at least two independent introductions in that area. Aedes japonicus collected west of Orahovica (Croatia) seemed to be genetically similar to samples previously
investigated from Southeast Germany/Austria and Austria/Slovenia. By contrast, samples
from east of Orahovica, together with those from Serbia and Bosnia and Herzegovina, were
characterised by another genetic make-up, but their origin could not be determined.
In 2021, individuals of Ae. japonicus were detected at two collection sites in the Czech
Republic for the first time: Prachatice close to the Czech-German border and Mikulov on
the Czech-Austrian border. Population genetics and comparison of genetic data showed a
close relationship of the Prachatice samples to a German population, while for Ae. japonicus
from Mikulov close relatives could not be identified.
In the future, the global spread and establishment of invasive mosquitoes through
international trade and travel will increase. Potential vectors, like the Asian bush mosquito
Ae. japonicus, can become a problem in Europe and Germany, especially in the course of
global warming which supports pathogen transmission. Monitoring the known populations
and identifying introduction and migration routes are therefore essential for vector
managing.
In vitro assays play a crucial role in the biopharmaceutical assessment of drugs. During the past two decades, biorelevant media became an indispensable tool to forecast the in vivo solubility and dissolution of pharmaceutical drug candidates, and to assess absorption risks like low solubility or drug precipitation. Nevertheless, in vitro set-ups are still a simplification of the conditions in the human GI tract. This thesis aimed to shed light on some of the remaining open questions, aiming at providing a better understanding of the effects of biorelevant media on solubility, dissolution, and precipitation processes, and providing guidance for a more streamlined usage in the future. The results of this work can be outlined in brief as follows: First, a new design of experiment-based method development was introduced which increased the robustness and accuracy of derivative UV spectrophotometric methods for drug quantification in biorelevant precipitation assays. Second, based on this new approach, the impact of SIF powder aging on the supersaturation and precipitation behavior of the model drug ketoconazole was investigated. Recommendations on the use of biorelevant media for precipitation assays were developed to further improve the reproducibility of transfer experiments and to enhance data reliability. Third, it was investigated under which circumstances the physiological bicarbonate buffer should be applied to Fasted State Simulated Intestinal Fluid medium for in vitro solubility, dissolution, and precipitation testing to resemble the in vivo conditions.
The need for the diversification of utilised species has emerged in the present aquaculture
production environment. Shifts in consumer interest, climate change-induced temperature
increases, and major fish disease outbreaks have put a strain on this industry. In this context,
the pikeperch (Sander lucioperca) has become a new target species for aquaculture in Central
Europe. This new aquaculture focus species exhibits high numbers of offspring, fast growth,
and high consumer acceptance. It can also effectively deal with higher temperatures and turbid
water. However, the rate of successful rearing is still low, as various developmental
transformations and environmental effects commonly lead to high mortality rates during the
early ontogenetic stages. The aim of this doctoral project was thus to obtain insight into
embryonic to larval developmental changes during pikeperch ontogeny. Specifically, the times
of change that influence survival were of focus. Based on the available literature, particular
attention was paid to general growth patterns and the connected developmental changes, the
determination of myogenesis gene marker expression changes, and the support of animal
welfare efforts for pikeperch rearing procedures. To achieve the aims of the study, a methodical
setup consisting of morphometric and developmental observations was combined with
transcriptome gene marker analysis for the different ontogenetic stages.
Three developmental phases were differentiated during the embryo-larval transition. Each of
these possessed distinct growth patterns with different growth rates. The intermediate
threshold phase showed internal organ development that focused on digestive, neuronal, and
heart tissues. Three activity phases of myogenesis were determined: during early embryonic
development, before hatching, and after hatching during the larval stages. Therefore, muscle
development seemed to be regulated to balance energy expenditures. Additionally, two
coinciding skeletogenic phases were found. Furthermore, a cell line from whole embryos was
developed to support the replacement of animals in future experimental setups. A software
system for video analyses was developed to support rearing procedures in aquaculture
facilities. This prototype can be used to automate the counting of specimens and thus allows
for faster responses to increasing mortalities. Based on the results of this thesis project, further
insights into the early development of pikeperches were obtained. This will facilitate the design
and adaptation of raising and husbandry protocols, which can help to further establish
pikeperch as an aquaculture species and support its application in modern recirculatory
systems.
The dissertation looks at bioeconomy innovation at different levels through the lens of economic geography. By progressing from the meta to the micro-scale, it tries to find answers to how the interrelated concepts of bioeconomy and innovation are embedded in these respective contexts while consecutively concretising bioeconomy and de-fuzzing it. To do that, it adopts a mixed-methods approach that starts general and ends specific, going from the meta-scale of literature over the macro-scale of three distinct areas in which bioeconomy is discussed to the meso-level of central actors of a European funding network before, lastly, considering case studies at the micro-scale. Throughout, the thesis aims to spatialise the bioeconomy by shedding light on the term and its drivers across multiple geographic layers. It thereby not only offers new insights into dimensions of innovation in the bioeconomy but also contributes to the discipline of economic geography by applying some of its essential theoretical ideas to an emerging political framework.
Interplay of reactive oxygen species with the mechanical properties of cells and mitochondria
(2023)
Cell mechanical properties are a popular label-free method for understanding basic cellular processes. In this thesis, I used Real-time deformability cytometry (RT-DC), a high-throughput microfluidic technology, to investigate the mechanical properties of cells and mitochondria under various conditions such as increased reactive oxygen species (ROS) levels and the application of different ligand coated gold nano-particles (Au-Nps) effect on cells. Initially, we showed the possibility to measure organelles, cells, and tissue-like structures (spheroids) in a single system by constructing a virtual fluidic channel. We investigated a potential application using cytochalasin D (cyto D) treatment, which revealed increased deformation and decreased stiffness in both the normal and virtual channels. Using mechanics as a marker, I investigated the effect of excessive ROS on the mechanical properties of human myeloid precursor cells (HL60). My findings suggest that the mechanical response of HL60 cells to increased ROS levels is mediated by re-localization of microtubules toward the cell center and F-actin to the cell periphery. Interestingly, I also observed intracellular acidification, which is a largely unexplored mechanism that may have contributed to our findings. I then extended our ROS and mechanics assay to investigate cell-AuNP interactions, demonstrating that cell properties vary depending on the cell culture media and ligand coating. The results showed that dextran coated gold nano-particels (Au-Nps) had low cytotoxicity, lower ROS release, and no change in cell mechanics, indicating a potential application for dextran Au NPs. Finally, I expanded our assays to include high-throughput microfluidic characterization of isolated mitochondria. Using both exogenously and endogenously induced ROS, we found an increase in mitochondrial deformation and a decrease in their size, which could have implications on mitochondrial function, i.e., fission and fusion. We believe that advanced applications of RT-DC technology will improve the comparability of results across different sample sizes while also promoting it as a disease detection technique.
Background
This study aimed to analyze the impact of low-value medications (Lvm), that is, medications unlikely to benefit patients but to cause harm, on patient-centered outcomes over 24 months.
Methods
This analysis was based on longitudinal data of patients with dementia. The impact of Lvm on health-related quality of life (HRQoL), hospitalizations, and health care costs were assessed using multiple regression models.
Results
Over 24 months, Lvm was highly prevalent and significantly increased the risk of hospitalization, increased health care costs, and reduced patients' HRQoL.
Conclusion
More than every second patient received Lvm, negatively impacting patient-reported HRQoL, hospitalizations, and costs. Innovative approaches are needed to encourage prescribers to avoid and replace Lvm in dementia care.
Posttranslational modifications are involved in the regulation of virtually all cellular processes, including immune response, nevertheless, they are also targets manipulated by invading pathogens. The first investigated example is protein citrullination which is an important posttranslational modification that acts on a multitude of processes like supervision of cell pluripotency and rheumatoid arthritis. Citrullination of targeted arginine residues is performed by the Peptidylarginine deiminase. Within the first published manuscript, being part of this thesis, it was possible to show the use of this posttranslational modification by the human pathogen Porphyromonas gingivalis to facilitate innate immune evasion at three distinct level. P. gingivalis was demonstrated to citrullinate proteins by Porphyromonas peptidylarginine deiminase resulting in diminished phagocytosis and subsequent killing by neutrophils. Furthermore, it was shown that citrullination of histone H3 enables P. gingivalis to survive in neutrophil extracellular traps and incapacitate the lysozyme-derived peptide LP9.
The second investigated posttranslational modification is ubiquitination and its role in respiratory tract infections. Ubiquitination is the covalent attachment of a small protein that consisting of only 76 amino acids to the ε-amino group of lysine residues to posttranslational modify proteins. Acute infections of the lower respiratory tract such as viral and bacterial co-infections are among the most prevalent reasons of fatal casualties worldwide. Therefore, the interactions between host and pathogens resulting in the impairment of the hosts immune response and immune evasion of the pathogens, need to be elucidated. To get new insights in the infection driven changes in protein polyubiquitination and alterations in the abundance of ubiquitin E3 ligases involved in ubiquitination, cellular proteomes were monitored in detail by high resolution mass spectrometry. Therefore, the epithelial cell lines 16HBE14o- (Manuscript II) and A549 (Manuscript III) were co-infected with influenza A virus H1N1 and Streptococcus pyogenes or Staphylococcus aureus or with influenza A virus H1N1 and Streptococcus pneumoniae, respectively. Here, it could be shown in 16HBE14o- cells that co-infection of epithelial cells is not characterized by decreased cell survival and that observable effects on the proteome and ubiquitinome are mostly additive rather than synergistic. S. pyogenes infection affected the mitochondrial function, cell-cell adhesion, endocytosis and actin organization. Viral infection affected mRNA processing and Rho signaling. Viral and bacterial co-infection was detected to affect processes that were already affected by both of the corresponding single infections. No further pathways were strongly affected by the co-infection. A similar result has been observed in A549 cells co-infected IAV and S. pneumoniae. Overrepresented gene ontology terms depict the sum of those observed in the viral and bacterial single infection. Moreover, no significant change in cell survival upon co-infection compared to single bacterial infection was noticed for A549 cells either. This led to the suggestion that co-infection of investigated epithelial cells under examined conditions possesses additive rather than synergistic effect and thus, may not worsen the outcome of the infection within the studied conditions. Infections in other systems, may provide varying results and thus should be examined in future studies.
Seas and oceans are essential for the global ecosystem. Entire societies, economies and countless livelihoods rely on their good environmental status. Yet, pressures on marine environments are increasing. An extensive assessment and monitoring of marine habitats is a vital precondition for understanding these systems and their sustainable conservation. Remote sensing methods can temporally accelerate the mapping, improve the spatial resolution and support the interpretation of large areas. Hydroacoustic becomes the method of choice for areas deeper than the coastal zone as optical signals are limited by strong attenuation in the water column. Apart from depth measurements for the creation of bathymetric charts, the recording of backscatter strength is useful for the characterization of the seafloor surface. The direct influence of the inhabiting benthic community on the backscattered signal is rarely considered, although it can be utilized for the detection of benthic life. Information about habitat-specific backscatter responses or a hydroacoustic remote sensing catalog for benthic habitats is missing so far.
The multibeam echosounder (MBES) has the advantage of recording both, bathymetry and backscatter strength simultaneously with related incidence angle. Further, recent technological developments allow to change between frequencies. Angular range curves supported the quantification of backscatter strength of different frequencies. Acoustic data sets were complemented by ground truthing in form of sedimentological and biological samples as well as video profiles. Study areas were located offshore the island of Sylt in the North Sea as well as in vicinity to Oder Bank and close to the coast offshore Hohe Düne/Rostock, both in the Baltic Sea. Investigated habitats included sand areas inhabited by tubeworms, loose mussel clusters on top of sand areas, seagrass meadows, coarse sand and gravel areas, and a reef covered by mussels.
Multifrequency backscatter maps, combining frequencies between 200 kHz and 700 kHz, illustrate small-scale features at the seafloor not visible in monofrequent maps. Key habitats showed a specific backscatter response, which can partly be related to macrobenthic flora and fauna. Data sets recorded with a (partly calibrated) MBES in three different month (May, August, October) revealed that backscatter strength can further detect spatial as well as temporal habitat dynamics. Alterations in the sediment composition at the seafloor surface of the ecologically valuable coarse sand and gravel areas were caused by seasonal changes in local hydrodynamics.
A newly developed 3D seismic lander has the ability to support hydroacoustic remote sensing as an additional, non-destructive ground truthing method utilizing a high frequency of 130 kHz to image the shallow subsurface. Buried objects, e.g., stones, shells, fruit gummy worms, as well as sediment disturbances could be detected and visualized in a laboratory experiment. The 3D seismic lander is likely to improve the investigation of volume scatter contribution to backscatter strength and is potentially applicable for the imaging of bioturbation.
Gram-negative bacteria secrete lipopolysaccharides (LPS), leading to a host immune
response of proinflammatory cytokine secretion. Those proinflammatory cytokines are
TNF-α and IFN-γ, which induce the production of indoleamine 2,3-dioxygenase (IDO). IDO production is increased during severe sepsis, and septic shock. High IDO
levels are associated with increased mortality. This enzyme catalyzes the degradation of tryptophan (TRP) to kynurenine (KYN) along the kynurenine pathway (KP).
KYN is further degraded to kynurenic acid (KYNA). Increased IDO levels accompany
with increased levels of KYNA, which is associated with immunoparalysis.
Due to its central role, the KP is a potential target of therapeutic intervention.
The degradation of TRP to KYN by IDO was intervened by 1-Methyltryptophan (1-
MT), which is assumed to inhibit IDO. By administering 1-MT, the survival of
1-MT-treated mice suffering from sepsis increased compared to mice not treated with
1-MT. The levels of downstream metabolites such as KYN and KYNA were
expected to be decreased. Surprisingly, in healthy mice and pigs, an increase in KYNA
after 1-MT administration was reported. Those unexpected metabolite alterations after 1-MT administration, and the mode of action, were not the focus of recent
research. Hence, there is no explanation for KYNA increase, while KYN did not change.
This thesis aims to postulate a possible degradation pathway of 1-MT along the KP
with the help of ordinary differential equation (ODE) systems.
Moreover, the developed ODE models were used to determine the ability of 1-MT to
inhibit IDO in vivo. Therefore, a multiplicity of ODE models were developed, including
a model of the KP, an extension by lipopolysaccharide (LPS) administration, and 1-MT
administration.
Moreover, seven ODE models were developed, all considering possible degradation pathways of 1-MT. The most likely degradation pathway was combined with the ODE model
of LPS administration, including the inhibitory effects of 1-MT.
Those models consist of several dependent equations describing the dynamics of the KP.
For each component of the KP, one equation describes the alterations over time. Equations for TRP, KYN, KYNA, and quinolinic acid (QUIN) were developed.
Moreover, the alterations of serotonin (SER) were also included. All together belong
to the TRP metabolism. They include the degradation of TRP to SER and to KYN,
which is further degraded to KYNA and QUIN. Every degradation is catalyzed by an enzyme. Therefore, Michaelis-Menten (MM) equations were used employing the substrate
constant Km and the maximal degradation velocity Vmax. To reduce the complexity of
parameter calculation, Km values of the different enzymes were fixed to literature values.
The remaining parameters of the equations were determined so that the trajectories of
the calculated metabolite levels correspond to data. The parameters of different models were determined. To propose a degradation pathway of 1-MT leading to increased
KYNA levels, seven models were developed and compared. The most likely model was
extended to test whether the inhibitory effects of 1-MT on IDO can be determined.
Three different approaches determined the ODE model parameters of the different hypothesis of 1-MT degradation. In the first approach, ODE model parameters were fixed
to values fitted to an independent data set. In the second approach, parameters were
fitted to a subset of the data set, which was used for simulations of the different hypotheses. The third approach calculated ODE model parameters 100 times without
fixed parameters. The parameter set ending up in trajectories of the TRP metabolites,
which have the smallest distance to the data, was assumed to be the most likely. The
ODE model parameters were fitted to data measured in pigs. Two different
experimental models delivered data used in this thesis. The first experimental model
activates IDO by LPS administration in pigs. The second one combines the IDO
activation by LPS with the administration of 1-MT in pigs.
The most likely hypothesis, according to approach 1 was the degradation of 1-MT to
KYNA and TRP. For the second data set the most likely one was the direct degradation of 1-MT to KYNA. With approach 2 the most likely degradation pathways were
the combination of all degradation pathways and the degradation of 1-MT to TRP and
TRP to KYNA. With approach 3 the most likely way of KYNA increase was given by
the direct degradation of 1-MT to KYNA. In summary, the three approaches revealed
hypothesis 2, the direct degradation of 1-MT to KYNA most frequently. A cell-free
assay validated this result. This experiment combined 1-MT or TRP with or without
the enzyme kynurenine aminotransferase (KAT). KAT was already shown to degrade
TRP directly to KYNA. The levels of TRP, KYN and KYNA were measured. The
highest KYNA levels were yielded with an assay adding KAT to 1-MT, corresponding
to hypothesis 2. The models describing the inhibitory effects of 1-MT revealed that
the model without inhibitory effects of 1-MT on IDO was more likely for all three approaches.
The correctness of hypothesis 2 has to be confirmed by further in vitro experiments. It
also has to be investigated which reactions promote the degradation of 1-MT to KYNA.
The missing inhibitory properties of 1-MT on IDO, determined by the in silico ODE
models, align with previous research. It was shown that the saturation of 1-MT was too
low, e.g. in pigs, to inhibit IDO efficiently.
In this study, the first possible degradation pathway of 1-MT along the KP is proposed.
The reliability of the results depends on the quality of the experimental data, and the
season, when data were measured. Moreover, the results vary between the different
approaches of parameter fitting. Different approaches of parameter fitting have to be
included in the analysis to get more evidence for the correctness of the results.
Until today, more than 100 years after its first description in Italy, the highly pathogenic avian influenza virus (HPAIV) has not lost its fearsome character for wild birds, poultry and humans. On the contrary, the number of outbreaks with high casualty rates in wild birds and poultry has multiplied in recent years and cases of zoonotic infections are also increasingly reported from HPAI endemic areas. The epidemiology of these infections is complex and also involves surface water and possibly sediments of shallow standing waters, which could play a role as a vector medium and/or virus reservoir. The goal of this project was to expand current knowledge of the influence of water on the spread of AIV. As part of this project, we were able to ...
1. ...improve AIV detection methods using real time RT-PCR in terms of sensitivity and breadth of viruses detected. In addition, we succeeded in economizing the procedure so that fewer resources are required and results are obtained faster (publication I: [173]).
2. ...develop an ultrafiltration-based enrichment method for AIV from surface water and evaluate it with field samples from HPAI outbreak areas in wild bird habitats (Wadden Sea coast of Schleswig-Holstein) and previously unaffected regions (Antarctic Weddell Sea) (publication II: [174]). Furthermore, protocols for testing different environmental sample matrices for AIV screening were tested and compared to results of passive monitoring by dabbing diseased or dead wild birds. AIV was detected in more than half (61%) of 44 water samples. We received additional sediment samples from 36 of the 44 water samples. In 18 of 36 of the sediments tested, as well as in 4.16% of 1705 fecal samples tested AIV was detected. However, the studies of the environmental samples mostly yielded only generic AIV detections, with viral loads in the range of the detection limit. This massively hampered further investigations for sub- and pathotyping. In contrast, 79.41% of 68 samples from passive monitoring showed high to very high HPAIV viral loads which also allowed sub- and pathotyping.
3. ...demonstrate in animal experiments that even very low titers (0.1 TCID50 ml-1) of HPAI viral infectivity in water can induce productive infection in susceptible but clinically largely resistant mallard ducks (publication III: [175]). Furthermore, we were able to develop evidence that there is a difference in virus spread that depends on the type of (contaminated) water source. This means that infections on poultry farms with inverted or nipple drinkers may follow a different course than infections in the wild, which are mediated via larger surface waters.
Overall, the results of this project highlight the important role of surface and drinking water, as well as aquatic sediments, in the spread of AIV. The methods developed here for AIV detection extend the possibilities for surveillance of AIV infections; however, passive remains superior to active surveillance of HPAIV infections in several aspects. Examination of various environmental samples did not yield a significant advantage in terms of an early warning system that would indicate the presence or spread of HPAIV in wild bird habitats prior to the occurrence of lethal infections in wild birds.
The deep geological underground represents an important georesource for the short-
term storage of renewable energy and the long-term reduction of greenhouse gas emissions. To ensure the economic viability and safety of any subsurface storage project, detailed characterisation of the quality and integrity of the reservoir and its cap rock is required. This characterisation includes the accurate determination of the petrophysical properties, such as porosity and permeability, as well as the potential mineral reactions, such as the dissolution of reactive phases, which may occur during the lifespan of such a project. Clay minerals are common components of many reservoir systems and, depending on their type and structure, can have a significant impact on storage and transport properties. These processes are, however, currently not well understood. In order to address these issues, the main focus of this thesis is on mineralogical analyses using X-ray diffraction (XRD) and microstructural studies using focused ion beam scanning electron microscopy (FIB-SEM) together with micro X-ray computed tomography (µXCT) to gain a better understanding of the influence of clay minerals on reservoir and cap rock properties.
A central part of this thesis focuses on the analysis of clay minerals and pore structures of the Bebertal Sandstone of the Parchim Formation (Early Permian, Upper Rotliegend), which is considered a natural analogue for the tight reservoir sandstones of the North German Basin. Two illite polytypes with a variety of characteristic structures have been identified in the Bebertal sandstone. Disordered 1Md illite forms the majority of the observed structures, which include omnipresent grain coatings, altered permeable feldspar grains and pore-filling meshwork structures. Trans-vacant 1M illite represents the second and youngest generation of authigenic illite and occurs as fibrous to lath-shaped particles that grew into open pore spaces and led to a significant reduction in porosity and permeability during late diagenesis. Based on these results, a model for the formation of illite polytypes in the aeolian layers of the Bebertal sandstone was developed that describes the temporal and spatial evolution of porosity and permeability during diagenesis. Information from this model was then used to improve the prediction of permeability of the Bebertal sandstone based on µXCT pore space models and direct numerical simulations. To achieve this, a micro-scale pore space model was created that allowed the simulation of permeability reduction by clay minerals by including nanoporous illite domains based on a novel morphological algorithm. By performing Navier-Stokes-Brinkman simulations, more accurate predictions of permeabilities with respect to experimentally determined values were obtained compared to conventional Navier-Stokes simulations.
The detailed characterisation of the Bebertal sandstone has shown that natural reservoir rocks are usually complex heterogeneous systems with small-scale variations in texture,
composition, porosity and permeability. Flow-through experiments on the Bebertal sandstone revealed that the coupled geochemical and hydrodynamic processes that occur during the dissolution of calcite could not be predicted by reactive transport models. Therefore, as part of this thesis, a novel approach for developing synthetic sandstones at low temperatures based on geopolymer binder was developed. It is shown that simpler and more homogeneous porous materials can be produced with porosity and permeability values in the range of natural sandstones. These can be used to better understand the dynamic and coupled processes relevant to the storage of renewable energy in reservoir rocks through improved experimental constraints.
The final part of this thesis reports on a detailed clay mineral and pore space study of
three shale formations and one mudstone that were identified as potential seals for the Mt. Simon sandstone reservoir in the Illinois Basin. During the Illinois Basin - Decatur Project, this reservoir was used for the sequestration of one megaton of supercritical carbon dioxide. In order to better assess the quality of the sealing units and to better understand the role of the intergranular clay mineral matrix as potential pathway for fluid migration, a multi-scale evaluation was conducted that included thin section analysis, quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN), mercury intrusion capillary pressure (MICP) measurements, quantitative XRD and high-resolution FIB-SEM. The results allow for the classification of the studied formations into primary and secondary seals and emphasise the importance of three-dimensional clay-mineral-related pore structure characterisations in cap rock studies. XRD proved the most reliable method for the identification and quantification of clay minerals in the studied cap rocks and mudstones. In contrast, FIB-SEM and QEMSCAN provided the spacial constraints for reconstructing fluid flow pathways within the clay mineral matrix.
Overall, this thesis highlights the importance of the precise identification of clay minerals in geological reservoirs and their cap rocks. It also illustrates the need for three-dimensional characterisation and modelling of the associated small pore structures for an improved understanding of the rocks diagenetic history as well as the prediction of the transport and storage properties of these crustal reservoir systems.
Background: Intact socio-cognitive abilities, such as theory of mind (ToM), facial emotion recognition (FER), social decision making (SDM) and visual perspective taking (VPT), are essential for human well-being and quality of life. Impairment in social cognition can have major implications for health in affected individuals and society as a whole. Evidence for changes in social cognition in healthy and pathological aging processes, such as subjective cognitive decline (SCD) and mild cognitive impairment (MCI), is currently either sparse or inconclusive. It is important to determine how social cognition changes in healthy and pathological aging and provide grounds for targeted and early assessment and intervention. The aims of this thesis were to investigate social cognition across four domains, in particular, ToM, FER, SDM and VPT, in healthy young and older individuals, as well as in individuals with cognitive deficits, such as SCD and MCI. In the case of a decline, further goals were to investigate the degree of impairment and the domains affected.
Methods: A systematic literature search was conducted in four major academic databases, MEDLINE, Web of Science Core Collection, CENTRAL, and PsycInfo, for studies investigating social cognition in healthy young and old individuals as well as individuals affected by SCD and MCI which met the inclusion criteria. The primary outcome was ToM and secondary outcomes were FER, SDM and VPT. After a systematic review was performed, studies eligible for meta-analysis were divided according to comparison groups and outcomes. Random-effects meta-analyses were conducted using standardized mean differences (SMD). Risk of Bias was assessed using the “Tool to assess risk of bias in cohort studies” modified for the present study design.
Results: After a thorough systematic literature search, 86 studies containing 88 comparisons were included in the systematic review, of which 47 were eligible for quantitative analysis. The meta-analysis revealed a progressive decline in ToM and FER abilities from young adulthood to MCI. Varying effect sizes demonstrated different trajectories of change for specific domains. Due to a lack of research, data investigating SDM and VPT, as well as SCD were insufficient for quantitative analysis.
Conclusion: ToM and FER decline gradually from healthy to pathological aging. Therefore, assessment of social cognition is important and should be incorporated in routine neurocognitive testing, so that targeted interventions can be introduced when needed. With this information in mind, future research should focus on the development of new assessment tools, as well as preventive and treatment strategies. This review also identified research gaps in certain populations (e.g. SCD, middle age, MCI-subtypes) as well as domains (VPT and SDM) that need to be addressed in the future.
The skull is an extremely informative part of the vertebrate body. Skulls are
involved to hunt, feed and drink, to nurse, fight, dig, and to many other activities.
Also, main sensory organs are situated on the head in order to enable a given
animal to see, smell, taste, feel, listen, equilibrate and think; hence, the head is the
main connection to the external world. It follows that a skull, with and without soft
tissue, can tell a lot about its owner. Each skull consists of many individual bones
constituting regions (e.g., snout and braincase) that represent different aspects of an
anatomical mosaic, which in turn allows deeper (palaeo)biological insights.
In the past three centuries, palaeontologists dug out countless fossils from all
over the world and from many preserved periods and groups, including dinosaurs.
Hence, public and private collections house numerous fossil skull specimens. To
further enlighten our understanding of palaeoecological, physiological and
phylogenetic affinities of dinosaurian representatives belonging to different groups,
and in order to reveal new aspects on their (neuro)anatomy, behaviour, ontogeny
and evolution, a thoroughly examination with modern techniques is the aim of this
thesis.
In order to get a phylogenetically broad understanding, fossil remains from at
least four extinct species, including Irritator challengeri (a theropod: mostly bipedal
carnivores) from the Early Cretaceous of northeastern Brazil, Europasaurus holgeri
(a sauropod: long-necked, quadrupedal herbivores) from the Late Jurassic of Lower
Saxony, Emausaurus ernsti together with an unnamed taxon from the Early Jurassic
of Mecklenburg-Western Pomerania, and Struthiosaurus austriacus, Late
Cretaceous of eastern Austria (the latter three are thyreophorans: armoured, mostly
quadrupedal herbivores), were in closer focus. To document and digitally reconstruct
cranial bones and cavities therein, the material was examined with micro computed
tomography (microCT). On this basis, the full morphology of the preserved anatomy
was revealed, described and contextualized, for example, in conjunction with
comparative anatomy and biomechanical considerations. During this process, further
methods were used to investigate and depict individual fossils: macro- and microphotography,
photogrammetry and phylogenetic analyses, each encompassing
multiple sub-tasks and being supported by 3D prints.
As part of the result, it was possible to formulate reasoned assumptions about
the lifestyle of the taxa in focus. For instance, the neuroanatomy and the osteological
characteristics of the spinosaurid Irritator challengeri implicate that this taxon was an
agile hunter with a habitually inclined snout that was specialized in catching relatively
small prey with a robust dentition and a comparably weak - but fast - bite, with a
remarkable jaw mechanism which enabled the animal to kinetically widen the
pharynx during lower jaw depression. The (neuro)anatomy of I. challengeri, S.
austriacus, E. ernsti and E. holgeri presented here, enrich our knowledge about a
plethora of (lifestyle-related) aspects of these animals, their closer relatives and the
prehistoric world they lived in.
External effects of agglomeration and human capital is a more than a century old research topic. Their theory and empirics have evolved over time to interact with more economic factors and to dig more deeply into heterogeneous effects, whose empirical evidence remains scarce, especially for developing countries. Furthermore, local human capital and agglomeration are often introduced in separate models rather than a single model in explaining productivity. These limitations motivate the implementation of this thesis. To achieve this, firm-level panel data from Vietnam is employed. This developing country provides an interesting case because its level of agglomeration and human capital is still low but its socio-economic conditions are highly dynamic with the high growth rates of urbanization and university-educated labor force (production inputs) as well as income (production output), in comparison with developed countries. The heart of this thesis lies on its chapter 2 and chapter 3, which are summarized as follows.
Chapter 2 aims at finding which agglomeration forces play the dominant role in affecting firms’ productivity and how agglomeration induces unequal influences across various firm characteristics. To achieve this, a six-year panel data set is employed, and the estimation is based on a production function that the left-hand side is firm’s total factor productivity while the righthand side is local technology which contains the agglomeration terms. In the first step of regression, consistent values of productivity are obtained following a strategy that combines the control function approach with the instrumental variables technique to tackle endogeneity caused by a possibility that firms choose their production inputs based on their productivity. In the second step, log of productivity is regressed on agglomeration proxies and controls, using multiple fixedeffects terms to control for unobserved factors and local shocks. Estimated results show that urbanization rather than specialization has a positive impact on productivity. Besides, the agglomeration effects are stronger for foreign-owned, small-sized, or young firms.
Chapter 3 shows attempts to find evidence of human capital externalities along with urbanization economies, given that the two external terms are rarely placed together in a single specification in literature. The estimation is implemented based on a production function whose context is an unique spatial equilibrium resulting from migration behaviors of entrepreneurs and workers. In this function, the externalities play the role of a region-specific productivity shifter. The model is regressed primarily with the instrumental variables technique to tackle possible identification problems. Between the two external terms, the resulting estimates confirm only the existence of urbanization economies. However, human capital externalities are found to be strong and significant in high-tech industries, implying that the effects of local human capital are very heterogeneous across different technological levels.
Objectives:
This study investigates the effectiveness of the Cold AP on the alteration of the enamel surface
without using acid etchant by using Conventional photo-activated resin bond to bond the
orthodontic brackets.
Materials and Methods:
One hundred and twenty-five Enamel specimens are prepared from disinfected bovine
mandibular incisors are divided into five groups. Group I: brackets are attached on the enamel
surface with the standard adhesive technique (etch + primer +bond). Group II: the brackets are
attached with the Standard Orthodontic adhesive technique without etching. Group III: the
enamel surface is conditioned with pure Argon Cold atmospheric plasma before the application
of the primer without using an acid etchant. Group IV: the enamel surface is conditioned with
the admixture of Argon Cold atmospheric plasma with 0.5 % Oxygen before the application of
the primer without using acid etchant Group V: after the application of Argon Cold atmospheric
plasma with 0.5 % Oxygen the surface is rewetted by deionized water before the application
of the primer and adhesive. After that, the samples are exposed to thermal cycling. The shear
bond strength of the samples is tested by the universal testing machine which measured the
maximum force at which the brackets are deboned from the tooth surface at a speed of
1mm/minute is measured.
Results:
Significant intergroup differences were found. Group V showed the highest shear bond
strength followed by Group I, VI, III, II respectively. There isn’t a statistical difference in the
values of The Shear bond strength values between Group III and IV.
Conclusions:
this study implies that Cold Atmospheric Plasma is a safe method to change the chemical
surface characteristics of the enamel surface.in addition to the significant importance of plasma
treatment followed by water rewetting, which could enhance adhesion between the orthodontic
attachments and the enamel layer
Podocytes are highly specialized kidney cells that are attached to the outer aspect of the glomerular capillaries and are damaged in more than 75% of patients with an impaired renal function. This specific cell type is characterized by a complex 3D morphology which is essential for proper filtration of the blood. Any changes of this unique morphology are directly associated with a deterioration of the size-selectivity of the filtration barrier. Since podocytes are postmitotic, there is no regenerative potential and the loss of these cells is permanent. Therefore, identification of small molecules that are able to protect podocytes is highly important. The aim of this work was to establish an in vivo high-content drug screening in zebrafish larvae. At first, we looked for a reliable podocyte injury model which is fast, reproducible and easy to induce. Since adriamycin is commonly used in rodents to damage podocytes, we administered it to the larvae and analyzed the phenotype by in vivo microscopy, (immuno-) histology and RT-(q)PCR. However, adriamycin did not result in a podocyte-specific injury in zebrafish larvae. Subsequently, we decided to use a genetic ablation model which specifically damages podocytes in zebrafish larvae. Treatment of transgenic zebrafish larvae with 80 µM metronidazole for 48 hours generated an injury resembling focal and segmental glomerulosclerosis which is characterized by podocyte foot process effacement, cell depletion and proteinuria. Following this, we established an in vivo high-content screening system by the use of a specific screening zebrafish strain. This screening strain expresses a circulating 78 kDa eGFP-labeled Vitamin D-binding fusion protein, which passes the filtration barrier only after glomerular injury. Therefore, we had an excellent readout to follow podocyte injury in vivo. We generated a custom image analysis software that measures the fluorescence intensity of podocytes and the vasculature automatically on a large scale. Furthermore, we screened a specific drug library consisting of 138 compounds for protective effects on larval podocytes using this in vivo high-content system. The analysis identified several initial hits and the subsequent validation experiments identified belinostat as a reliable and significant protective agent for podocytes. These results led to a patent request and belinostat is a promising candidate for a clinical use and will be tested in mammalian podocyte injury models.
Methane (CH4) is a potent greenhouse gas with rising atmospheric concentrations.
Microorganisms are essential players in the global methane cycle. In fact, the largest part of methane emissions derives from microbial production by methanogenic Archaea (methanogens). Microorganisms do not only produce methane: methanotrophs can also oxidize the methane produced by methanogens. In addition, soil methanotrophs are the only biological methane sink, oxidizing up to 30-40 Tg of this potent greenhouse gas per year worldwide.
However, intensified management of grasslands and forests may reduce the methane sink capacity of soils.
In general, the interaction of methanogens and methanotrophs determines whether a soil is a source or a sink for methane. It is, therefore, crucial to understand the microbial part of the methane cycle and which factors influence the abundance and activity of methane-cycling microbes. However, capturing the soil microbiome's abundances, activity, and identity is
challenging. There are numerous target molecules and myriad methods, each with certain
limitations. Linking microbial markers to methane fluxes is therefore challenging. This thesis aimed to understand how methane-cycling microbes in the soil are related to soil methane fluxes and how soil characteristics and human activity influence them.
The first publication investigated the biotic and abiotic drivers of the atmospheric methane sink of soils. It assessed the influence of grassland land-use intensity (150 sites) and forest management type (149 sites) on potential atmospheric methane oxidation rates (PMORs) and the abundance and diversity of CH4-oxidizing bacteria (MOB) with qPCR in topsoils of three temperate regions in Germany. PMORs measured in microcosms under defined conditions were approximately twice as high in forest than in grassland soils. High land-use intensity of grasslands negatively affected PMORs (−40%) in almost all regions. Among the different aspects of land-use intensity, fertilization had the most adverse effect reducing PMORs by 20%.
In contrast, forest management did not affect PMORs in forest soils. Upland soil cluster (USC)α was the dominant group of MOBs in the forests. In contrast, USCγ was absent in more than half of the forest soils but present in almost all grassland soils. USCα abundance had a direct positive effect on PMOR in forests, while in grasslands, USCα and USCγ abundance affected PMOR positively with a more pronounced contribution of USCγ than USCα.
In the second publication, we used quantitative metatranscriptomics to link methane-cycling microbiomes to net surface methane fluxes throughout a year in two grassland soils. Methane fluxes were highly dynamic: both soils were net methane sources in autumn and winter and net methane sinks in spring and summer. Correspondingly, methanogen mRNA abundances per
gram soil correlated well with methane fluxes. Methanotroph to methanogen mRNA ratios were higher in spring and summer when the soils acted as net methane sinks. Furthermore, methane uptake was associated with an increased proportion of USCα and γ pmoA and pmoA2 transcripts. High methanotroph to methanogen ratios would indicate methane sink properties.
Our study links the seasonal transcriptional dynamics of methane-cycling soil microbiomes for the first time to gas fluxes in situ. It suggests mRNA transcript abundances as promising indicators of dynamic ecosystem-level processes.
We conclude that reduction in grassland land-use intensity and afforestation can potentially increase the methane sink function of soils and that different parameters determine the microbial methane sink in forest and grassland soils. Furthermore, this thesis suggests mRNA transcript abundances as promising indicators of dynamic ecosystem-level processes. Methanogen transcript abundance may be used as a proxy for changes in net surface methane emissions from grassland soils.
This work first sets out to find if economic, ecological, or social incentives drive consumers towards or against dietary decisions (Contribution A). It then develops a framework of TCA for food to describe economically conveyed incentives that are tied to ecological and social indicators within the food market (Contribution B). The framework is subsequently enhanced and broadened to include a deeper understanding and broader field of indicators for more holistic TCA calculations (Contributions C and D). Lastly, based on these calculations, TCA of food is implemented in a factual use case as the framework and calculations are deployed for commodities of a German supermarket chain; then consumer, as well as expert feedback is used for the discussion on socially responsible campaigning and policy change (Contribution E).
Emerging infectious diseases are among the greatest threats to human, animal and plant health as well as to global biodiversity. They often arise following the human-mediated transport of a pathogen beyond its natural geographic range, where host species are typically not well adapted due to a lack of co-evolutionary host-pathogen dynamics. One such pathogen is the fungus Pseudogymnoascus destructans (Pd), which causes White-Nose disease in hibernating bats. While Pd was first observed in North America where it has led to mass-mortalities in some bat species, the pathogen originates from Eurasia where infection is not associated with mortality. Most of the Pd research has focused on the invasive North American range, which likely underestimated the genetic structure of the pathogen and the role it might play in the disease dynamics.
In my work, I therefore evaluated the genetic structure of Pd in its native range with the aim of uncovering cryptic diversity and further use population genetic data to address some key ecological aspects of the disease dynamics. With an extensive reference collection of more than 5,000 isolates from 27 countries I first demonstrated strong differentiation between two monophyletic clades across several genetic measures (multi-locus genotypes, full genome long-read sequencing and Illumina NovaSeq on isolate pools). These findings are consistent with the presence of two cryptic species which are both causative agents of bat White-Nose disease (‘Pd-1’, which corresponds to P. destructans sensu stricto, and ‘Pd-2’). Both species exist in the same geographic range and co-occur in the same hibernacula (i.e., in sympatry), though with specialised host preferences. I further described the fine-scale population structure in Eurasia which revealed that most genotypes are unique to single hibernacula (more than 95% of genotypes). The associated differences in microsatellite allele frequencies among hibernacula allowed the use of assignment methods to assign the North American isolates (exclusively Pd-1) to regions in Eurasia. Hence, a region in Ukraine (Podilia) is the most likely origin of the North American introduction.
To gain further insights into the spatial and temporal dynamics of White-Nose disease on a localised scale, several hibernacula were sampled with high intensity (artificial hibernaculum in Germany and natural karst caves in Bulgaria). Low rates of Pd gene flow were observed even among closely situated hibernacula. This indicates that Pd does not remain viable on bats over summer or it would be frequently exchanged among bats (and hence hibernacula) resulting in a homogenous distribution of genotypes. Instead, bats need to become re-infected each hibernation season to explain the yearly re-occurrence of White-Nose disease. Given the distribution and richness of Pd genotypes on hibrnacula walls and infected bats of the same hibernacula, bats become infected from the hibernacula walls when they return after summer. This means that environmental reservoirs exist within hibernacula (i.e., the walls) on which Pd spores persist during bat absence and which drive the yearly re-occurrence of White-Nose disease. In an experimental setup, I confirmed the long-term viability of Pd spores on abiotic substrate for at least two years and furthermore discovered temporal variations in Pd spores’ ability to germinate. In fact, these variations followed a seasonal pattern consistent with the timing of bats absence (reduced germination) and presence (increased germination) and could indicate adaptations of Pd to the bats’ life-cycle. The infection of bats from environmental reservoirs hence seems to be a central aspect of White-Nose disease dynamics and Pd biology.
Pds ability to remain viable for extended periods outside the host increases its risk of being anthropogenically transported and might have played a role in the emergence of White-Nose disease in North America. The existence of a second species (Pd-2) poses a great additional danger to North American bats considering that its introduction there could lead to deaths and associated population declines in so-far unaffected species given what is known about differing host species preferences in Eurasian bats. Even within the native range of Pd, the movement of Pd between differentiated fungal populations could facilitate genetic exchanges (e.g., through sexual reproduction) between genetically distant genotypes. Such genetic exchanges could lead to phenotypic jumps in pathogenicity or host-species preferences and should hence be prevented.
The native range of a pathogen holds great potential to better understand the genetic and ecological basis of a (wildlife) disease. My work informs about the dangers associated with the accidental transport of Pd (and other pathogens) and highlights the need for ‘prezootic’ biosecurity-oriented strategies to prevent disease outbreaks globally. Once a pathogen has arrived in a new geographic range, and particularly if it has environmentally durable spores (as demonstrated for Pd), it will be difficult/impossible to eradicate. Furthermore, a pathogen’s ability to remain viable outside the host and infect them from environmental reservoirs has been associated with an increased risk of species extinctions and needs to be considered when designing management strategies to mitigate disease impact.
Ion traps such as Paul traps and MR-ToF (multi-reflection time-of-flight) devices are indispensable tools at radioactive ion beam facilities for the preparation of high-quality radioactive ion beams for subsequent experiments or for precise measurements of the properties of radioactive ions, such as nuclear binding energies or nuclear charge radii.
Within the work of this thesis, Doppler- and sympathetic cooling is implemented in a linear Paul-trap cooler-buncher enabling a reduction of the longitudinal emittance of radioactive ion beams resulting in a significant improvement of the ion beam quality. Moreover, a next-generation MR-ToF device is conceptualized in order to achieve isobaric pure beams with a higher ion intensity than state-of-the-art MR-ToF devices can provide. Once fully constructed and commissioned, it will operate at an unprecedented ion beam energy of 30 keV. Both of these advances are expected to become important for a wide range of experimental programs pursued at low-energy branches of RIB facilities ranging from fundamental symmetry studies, nuclear structure, rare isotope studies with antimatter, searches of physics beyond the standard model to material science and the production of medical isotopes.
The next-generation MR-ToF mass separator is based on MIRACLS’ 30-keV MR-ToF device for highly sensitive and high-resolution collinear laser spectroscopy. By storing the ions in the Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS), the same ion bunch is probed by a spectroscopic laser for thousands of times compared to a single passage in traditional collinear laser spectroscopy (CLS). Dedicated simulation studies show that the accuracy and resolution will be close to traditional single-passage CLS while the sensitivity is significantly enhanced. Hence, measurements of nuclear properties via fluorescence-based CLS of very rare radionuclides as well as highly sensitive and high-precision measurements of electron affinities via laser-photodetachment-threshold spectroscopy of negatively-charged (radioactive) ions will become possible.
First measurement campaigns employing MIRACLS’ 1.5-keV MR-ToF device confirm the outstanding boost in signal sensitivity and provide confidence in the application of the MIRACLS technique for the measurement of scarcely produced radioactive ions that have been so far beyond the reach of conventional techniques. Furthermore, the electron affinity of 35Cl was measured, which is in perfect agreement with the literature value. These measurements will serve as important benchmarks for modern atomic and nuclear theory, especially in its description of nuclear charge radii.
In summary, the implementation of Doppler and sympathetic cooling at RIB facilities, the conceptualization of a 30-keV MR-ToF apparatus for highly selective and high-flux mass separation as well as for highly sensitive and high-resolution fluorescence-based laser spectroscopy and the expansion of the MIRACLS technique for the study of negatively-charged ions will enable unprecedented new measurement opportunities at RIB facilities.
Increasing environmental changes primarily due to anthropogenic impacts, are affecting organisms all over the planet. In general, scientists distinguish between three different ways in which organisms can respond to environmental changes in their habitat: extinction, dispersal and adaptation. An example of organisms which are highly adaptable and can easily cope with new and changing environments are invasive species which are able to colonize new habitats with only few individuals. To successfully survive in their new environment, invasive species adapt fast to novel abiotic and biotic parameters, such as different temperature regimes. Phenotypic plasticity which enables organisms to quickly modify their phenotype to new environmental conditions, explains the success in adaptation of invasive species.
While underlying mechanisms of phenotypic plasticity are not fully understood, one possible “motor” of phenotypic plasticity is epigenetics. Especially DNA methylation could explain the fast changes of the organism’s phenotype due to plasticity when experiencing changing environments, as invasive species do. DNA methylation could even contribute to the adaptation of invasive species via phenotypic plasticity, especially with clonally reproducing species. Methods such as common garden experiments with clonally reproducing species are a useful tool to differentiate between phenotypic plasticity and genetic adaptation because the confusing effects of genetic variation are lowered in clonally reproducing species.
Our overall goal was to evaluate the genetic adaptive potential of New Zealand mud snail (Potamopyrgus antipodarum) populations from Europe since they went through an extreme bottleneck after colonizing Europe only 180-360 generations ago. Seemingly, two different clonal lineages colonized Europe because two 16 s rRNA and cytochrome b haplotypes were found across different European countries, haplotypes t and z. The NZMS is a highly successful invasive species that is nowadays nearly globally distributed. The shells of the NZMS show a habitat-dependent high variability and are a fitness-relevant trait. The high variability in shell morphology is due to both genetic variation and phenotypic plasticity. To disentangle genetic from environmental effects on the shell morphology NZMS, we conducted a common garden experiment. We kept asexually reproducing females from eleven European populations in climate cabinets with three different temperatures to produce offspring. We compared shell size and shape across three generations using the geometric morphometrics approach. Furthermore, we estimated reaction norms, maternal effects, broad-sense heritability, the coefficient of genetic variation (CVA) and evolvability (IA) in shell size and shape across different temperature conditions. Additionally, we investigated the reproductive rate of the parental generation.
Results showed that the shell morphology of the parental generation differed across populations. In contrast, the shell morphology of offspring generations became more similar. The reaction norms of the F1 generation were rather variable across the three temperatures. However, we were able to observe a haplotype-dependent pattern across the reaction norms suggesting a restricted genetic differentiation among NZMS in Europe. We detected high heritability values in size indicating a high genetic influence. Heritability values for shape were lower than in size. Generally, heritability varied slightly depending on temperature. Size seemed to have a higher evolvability than shape. However, the values of all our calculations were very low which indicates that the European NZMS populations are genetically diminished. The reproductive rate of the parental generation was rather haplotype than temperature dependent. In summary, we were able to display that the NZMS is capable to plastically adapt its shell morphology to different temperatures showing significant differences between the two haplotypes. Nevertheless, the low evolvability values indicate that little genetic variation has formed since the arrival of the NZMS in Europe and therefore, European NZMS seem to have a reduced ability to react to selection.
These results implied that phenotypic plasticity is important for the adaptation to different environmental conditions in the NZMS and maybe other molluscan species. Since classical experimental approaches can only describe the resulting phenotypes, we also intended to shed more light on the mechanistic side of environmentally induced phenotypic modifications using DNA methylation analysis. Although molluscs represent one of the most diverse taxa within the metazoan and are found in many different habitats, our knowledge of the DNA methylation in molluscs is scarce. Therefore, we aimed at deepening and summarizing our understanding about DNA methylation in molluscs. Publicly available molluscan genomic and transcriptomic data of all eight mollusc classes was downloaded to search for DNA methyltransferases (DNMTs 1-3) responsible for DNA methylation. Additionally, we estimated the normalized CpG dinucleotide content (CpG o/e) indicating the presence/absence and the frequency of DNA methylation in the genome. The CpG o/e ratio refers to the level of DNA methylation in the genome. Based on the sensitivity of methylated cytosines to mutate into thymine residues, species having a high germline methylation in genomic regions over evolutionary time, also have a lower CpG content, which is called CpG depletion. In contrary, species with a limited germline methylation in genomic regions over evolutionary time, show a higher CpG content and lack CpG depletion. The presence or absence of CpG depletion can be calculated with the CpG o/e ratio. Ultimately, the goal of our analyses was to gain insight into the evolution of methylation in molluscs.
We detected DNMTs in all eight mollusc classes and in most of the species. It is therefore plausible that the last common ancestor of molluscs has already had the enzymatic machinery which is needed for DNA methylation. However, various species did not possess the complete DNMT toolkit indicating evolutionary modification in DNA methylation. In general, we found a wide distribution of the bimodal CpG o/e pattern in six mollusc classes, resulting from CpG depletion. The genes in these groups seem to be divided into genes with a high degree of methylation and genes with a lower degree of methylation. This implies that DNA methylation seems to be rather common in molluscs. Species of Solenogastres and Monoplacophora were not or only sparsely methylated. It seems that those mollusc groups have undergone a reduction in DNA methylation. We hope that our investigations will demonstrate the lacking knowledge in epigenetics of molluscs and encourage scientist to execute and continue genetic studies on molluscs.
Plus‐strand RNA [(+)RNA] viruses are the largest group of viruses, medically highly relevant human pathogens, and are a socio‐economic burden. The current global pandemic of the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) shows how a virus has been rapidly spreading around the globe and that– without an antiviral treatment– virus trans mission is solely dependent on human behavior. However, other (+)RNA viruses such as rhino‐, noro‐, dengue‐ (DENV), Zika, and hepatitis C virus (HCV) are constantly spreading and expanding geographically. As in the case of hepatitis C, since its first identification in the 1970s, it took more than 30 years to understand the HCV structure, genome organiza t ion, life cycle, and virus‐host interplay leading to the cure of a chronic and life‐threatening disease. However, no vaccination or antiviral treatment exists for most (+)RNA viruses. Con sequently, a precise and comprehensive analysis of the viruses, their life cycles, and parasitic interactions with their hosts remains an important field of research. In the presented thesis, we use mathematical modeling to study the life cycles of (+)RNA viruses. We analyze replication strategies of closely related (+)RNA viruses, namely HCV, DENV, and coxsackievirus B3 (CVB3), to compare their life cycles in the presence and ab sence of the host’s immune response and antiviral drug treatment and consider different viral spreading mechanisms. Host dependency factors shape the viral life cycle, contribut ing to permissiveness and replication efficiency. Our mathematical models predicted that host dependency factors, such as ribosomes, and thus the virus’ ability to hijack the host cell’s translation machinery play an essential role in the viral genome replication efficiency. Furthermore, our mathematical model suggested that the availability of ribosomes in the vi ral life cycle is a crucial factor in disease outcome: the development of an acute or chronic disease. Even though the host developed strategies to attack the virus, e.g., by degrading the viral genome, blocking the viral protein production, and preventing viral spread, viruses found strategies to countermeasure those so‐called host restriction factors derived from the immune system. Our mathematical models predicted that DENV might be highly effective in blocking the cell’s attempts to recognize the invader. Moreover, we found ongoing HCV RNAreplication even with highly effective antiviral drugs that block processes in the viral life cycle. Furthermore, we found alternative pathways of infection spread, e.g., by HCV RNA carrying exosomes, which may be a possible explanation for reported plasma HCV RNA at the end of treatment, found in a subset of patients. Hence, the mathematical models presented in this thesis provide valuable tools to study the viral replication mechanism in detail. Even though being a simplification of reality, our model predictions confirm and explain known and suggest novel biological mechanisms. In the pre sented thesis, I will summarize and discuss key findings and contextualize model predictions in the broader scientific literature to improve our understanding of the viral dynamics and the virus‐host interplay.
As the animal-to-human interface becomes increasingly narrow, transmission events of zoonotic pathogens between animals and humans become more and more probable. While SARS-CoV-2 already accomplished a spillover infection to humans and is responsible for the current pandemic, the bat H9N2 IAV with so far unknown zoonotic potential was only recently discovered. In order to identify I) the role and potential of a newly discovered, potentially pre-pandemic virus, such as the bat H9N2, or II) possible future prevailing virus mutant variants of an already known pandemic virus, such as SARS-CoV-2, it is important to characterize these emerging viruses in vivo as soon and as good as possible.
The first objective in this dissertation (Publications I and II) therefore deals with the characterization of bat H9N2 and the estimation of its zoonotic or even pandemic potential.
In Publication I, a general susceptibility of directly inoculated Egyptian fruit bats to bat H9N2 was confirmed by successful seroconversion, although exhibiting only moderate viral shedding. All three contact animals remained seronegative, though one contact bat showed slight lesions in the histopathological analysis.
Publication II further addressed the question of the zoonotic potential of this virus. Inoculation of day-old turkey hatchlings demonstrated moderate susceptibility to bat H9N2 infection with a measurable seroconversion, while day-old chicken hatchlings were not susceptible to bat H9N2. Ferrets proved to be highly susceptible to bat H9N2 with high viral shedding, a transmission efficiency rate of 100% to direct contact animals at 2 days post contact, but with only minimal clinical signs. Importantly, the virus demonstrated the ability to evade the MxA-restriction factor and to replicate efficiently in human lung tissue explants. Furthermore, seasonal IAV- and standard IAV-vaccines showed no cross reactivity against the bat-N2 protein in humans. Therefore, further research on such viruses is urgently needed in order to prevent a renewed pandemic situation in the future as caused by SARS-CoV-2.
The second objective in this dissertation dealt with the identification and characterization of emerging SARS-CoV-2 Variants of Concern (VOCs).
Therefore, in Publication III, competitive infection experiments were performed using the Syrian golden hamster, the ferret, and transgenic mouse models (K18-hACE2 and hACE2-KI). These studies revealed replicative and transmissive predominance of Alpha VOC over Beta VOC, but not over SARS-CoV-2 WT in the hamster model, although Beta VOC substantially replicated in the lungs of donor animals. In contrast, the Alpha VOC had an unambiguous replication and transmission advantage over WT SARS-CoV-2 in the ferret and both mouse models. A recombinant SARS-CoV-2 WT-SAlpha virus helped to assign the fitness advantage of this variant particularly to the spike protein-associated mutations.
In Publication IV, in vitro results inferred an early replicative fitness advantage of Omicron BA.1 over Delta VOC, although the opposite was observed in competitively inoculated hamsters, ferrets and naive hACE2-KI mice. In addition, Publication IV demonstrated a disadvantage in transmission for the VOC Omicron BA.1 over the Delta VOC and a lack of susceptibility of ferrets after a single infection with the VOC Omicron BA.1. An mRNA vaccination of K18-hACE2 mice caused a drastic reduction of infectious virus particles in organ material following an infection with a recombinant SARS-CoV-2 WT-SDelta, but not when challenged with the SARS-CoV-2 SOmicron BA.1 clone.
This dissertation includes numerous, comprehensive experimental studies that are generally important for the characterization of emerging, potentially pre-pandemic viruses and may provide crucial information about the future dominance of certain virus variants in an ongoing pandemic. Here, the need for the use of a variety of animal models becomes apparent. By characterizing and classifying potentially zoonotic strains, these methods will help to better prepare for potentially upcoming pandemics and, in the case of a zoonotic or even pandemic event, to better detect and understand the circulating strains and their evolution.
The respiratory epithelium acts as both, a barrier of the respiratory tract to Nipah virus (NiV) entry and at the same time as a significant determinant of virus shedding. Both, for humans and pigs, replication in the respiratory tract epithelia is considered a major factor in transmission to other hosts. To understand why the virus constitutes a high-risk pathogen for livestock and humans, knowledge about
viral replication and host responses in relevant cells and tissues is crucial. Most in vitro studies, however, have been performed in conventional cell lines or non-differentiated lung cells. Only a few examples exist where Henipavirus infections have been investigated in fully-differentiated lung
epithelial cell models.
Thus, one aim of this thesis was to investigate infection, replication, spread and host protein dynamics of NiV in primary bronchial epithelial cells (BEC) cultivated at the air-liquid-interphase (ALI). By
immunofluorescence imaging, the NiV infection dynamics in BEC-ALI cultures were monitored over a 12 day time course, in order to provide detailed information about the infection process in the
respiratory epithelium of pigs and ferrets. Compared to undifferentiated primary BEC, the specific infectivity of NiV in BEC-ALI cultures was low. Infections remained focal and complete infection of the
cultures was not observed, even at 12 dpi. Analysis of viral titers and viral mRNA indicated a limited
virion release from the infected ALI-cultures while most of the newly synthesized NiV-RNA remained
cell associated. Immunofluorescence analysis of cross sections from infected ALI-cultures revealed
large infected areas that exhibited a strong cytopathic effect (CPE). Disruption of the epithelium
resulted in apical release of virus antigen-positive cell detritus while ciliated areas and basal cells were
less affected. From these data it was concluded, that NiV transmission could be supported by
exhalation of cell debris associated NiV and thus may contribute to rapid spread of infection in swine
populations.
A second aim was to explore the dynamics of host responses to NiV infection in differentiated BEC-ALI
culture and to assess whether this differs to conventional cell line data available from literature. Even
though strong CPE appeared in later phases of NiV infection, at least the porcine PBEC-ALI cultures
remained robust enough to allow protein sampling over 12 days infection course. Subsequent MS-based proteomics enabled unprecedent insight in complex cell culture response upon NiV infection.
Previous reports indicated a lack of efficient interferon type I induction in non-differentiated pig or
human BEC which were considered a prerequisite for efficient replication in the respiratory epithelium
and virusspread. In contrast to non-differentiated pig BEC (PBEC), in PBEC-ALI cultures multiple factors
involved in interferon responses were upregulated upon NiV infection. Thereby it was demonstrated
that NiV infection induced a robust innate immune response upon infection with elevated components of antigen processing and presentation resulting in the conversion from the constitutive proteasome to the immunoproteasome. In contrast to previous reports about NiV-infected non-differentiated
PBEC or endothelial cells, incomplete immunoproteasome formation and limitations in interferon
response could be excluded. Thus, a model is proposed in which NiV infection and spread in differentiated PBECs is slowed by potent innate immune responses to the virus infection. Overall, the
findings highlight the important role of the respiratory epithelium not only as a physical barrier to virus
infections but also indicate itsrole as a primary site of adaptive immune induction through NiV induced
antigen processing and MHC I presentation.
Finally, to allow functional studies of Henipaviruses at the BSL-2 biosafety level a recombinant CedPV
was generated and rescued. An imaging based screening and quantitative analysis pipeline was established to investigate the role of cellular factors and to screen for potential virus and host gene
directed inhibitory factors. Accordingly, different host and viral genes were targeted with a siRNA-pool
either targeting virus or selected cellular mRNAs followed by the infection with the CedPV and the
quantification of infected cells. With proof of concept of the siRNA screening pipeline, the recombinant
CedPV clone was used as a backbone to insert variousfluorescence reporter genesin order to optimize
the analysis workflow by allowing direct virus quantification in live, unstained samples. Consequently,
this thesis provides a valuable proof for future approaches related to the function of virus proteins,
influence of host-factors and virusreplication and Henipavirus-inhibitorscreens at low biosafety levels.
The role of cell-penetrating peptides in the induction of T cell responses by virus-like particles
(2023)
Many viral structural proteins can self-assemble into virus-like particles (VLPs). VLPs can serve as an effective vaccine or be used as a vaccine platform. One of these structural proteins is the hepatitis B virus core antigen (HBcAg), which appears to be suitable as an antigen carrier due to its high immunogenicity. HBcAg has a major immunodominant region (MIR) that is presented on the surface of the VLPs after self-assembly. Foreign antigens can be inserted into this region. Since HBcAg VLPs, unlike the Hepatitis B virus (HBV), do not have an envelope, they are not able to penetrate cell membranes efficiently. As an extracellular antigen, HBcAg VLPs primarily induce a strong humoral immune response.
In the present study, we investigated the extent to which HBcAg can be modified to also elicit an enhanced cellular, particularly a cytotoxic, immune response. A cytotoxic CD8+ T cell response is predominantly induced by intracellular antigens. Therefore, our goal was to increase the cell penetration capacity of VLPs. We aimed to achieve this by fusing cell-penetrating peptides (CPPs) to HBcAg. CPPs can spontaneously penetrate cell membranes to enter the cytoplasm of cells. To guarantee that the CCPs were localized to the surface of the VLPs, we fused CPPs to the N-terminus of HBcAg. The CCPs were followed by a tag to allow the purification of VLPs. The T cell epitopes, against which the induced CTL should be directed, were derived from the Large T antigen and inserted into the MIR of HBcAg. Finally, we fused fluorescent proteins to the C-terminus of HBcAg to track the entry of VLPs into cells.
Modifications of HBcAg may lead to reduced stability or altered structure of VLPs. To analyze the stability of VLPs, we used nanoscale differential scanning fluorimetry (nanoDSF) analysis. This revealed that the N-terminal fusion of CPPs or the tag to HBcAg does not reduce VLP stability. However, some peptides incorporated into the MIR had a significant effect on the structure and stability of the VLPs. While the incorporation of a Flag-tag or a peptide from ovalbumin had no negative effect on VLP stability, the incorporation of peptides representing T cell epitopes of Large T antigen interfered with VLP formation. Denaturation and reassembly of the aggregates significantly improved the homogeneity of the VLPs, and the C-terminal addition of arginine-rich domains enhanced stability.
Using live cell imaging and flow cytometry, we demonstrated that HBcAg VLPs functionalized with CPP exhibited up to 40% more efficient penetration into professional antigen-presenting cells (JAWS II) than HBcAg VLPs without CPP. This resulted in the increased presentation of integrated T cell epitopes by dendritic cells. In vivo, we detected significantly increased induction of SV40 Large T antigen-specific CTL in mice immunized with CPP-conjugated VLPs compared to unconjugated VLPs.
In this study, we demonstrated that a stronger cellular immune response can be induced by CPP-functionalized HBcAg VLPs than with the unmodified HBcAg VLPs in vitro as well as in vivo. This discovery may have positive implications for future vaccine development where an enhanced cellular component of the immune response is desirable.
Underground hard coal mining operations irreversibly disrupt the pre-existing mechanical equilibrium of the geological media. The employment of high-recovery methods modifies the stress field of the sedimentary sequence, generating movement and faulting of the rock layers above and below mined seams. These new fracture zones do affect the original conditions of the hydrogeological system by modifying flow pathways and increasing the permeability of the rock sequence. Moreover, the surface area of rock exposed to air and water is increased, conditioning the water-rock interaction. Despite this rather clear conceptualization, flow and reactive transport processes in fractured overburdens are rarely modeled simultaneously. Discrete setups that consider fractures and porous matrix require extensive characterization of both media, which is impractical for regional case studies. As a result, most post-mining models explicitly ignore fracture structures by employing the equivalent porous approach or even both media with lumped parameter models. However, omitting either medium represents a delicate simplification, considering that mining-related fractures control the rate and direction of water flow within moderately permeable but relatively highly porous rock sequences.
In this dissertation, the specific contribution of fractured and matrix continua to the transient discharge and water quality of a post-mining coal zone is quantified and evaluated. For this purpose, dual and multiple interacting continua models are employed to simulate fluid flow and reactive mass transport in fractured and variable water-saturated rock sequences. The effectiveness of the models is evaluated by simulating the origin, generation and transport of acid mine drainage (i.e., water with elevated concentrations of hydrogen, iron, sulfate and chloride) within the shallow overburden of the Ibbenbüren Westfield. Compared to other coal districts in Germany, this area is strongly delimited by the local geology and topography, resulting in a well-defined hydrogeological system to test the models. Petrographic and chemical analyses performed on core samples from the area show the strong influence of mining-derived fractures on the water-rock interaction within the Carboniferous sequence. The presence of oxidized pyrite along with amorphous iron hydroxide phases in weathering fronts on both sides of the fractures demonstrates the exchange of solutes and gases between the fractured and the porous matrix media.
Based on the previous evidence, the TOUGHREACT software is employed to characterize flow and reactive transport processes in the Westfield. However, each of the two processes is simulated at separate stages to have more control in the adjustment of sensitive parameters for which little information is available. For the flow component, a dual continuum model, with Richard’s equations is used to characterize the unsaturated water flow in both fractured and matrix media. Under this approach, the model adequately reproduces the bimodal flow behavior of the discharges measured in the mine drainage for the years 2008 and 2017. Simulation results show how the fractured continuum generates intense discharge events during the winter months while the rock matrix controls smooth discharge limbs in summer, when water is slowly released back to the fractures. With the flow component calibrated, the second part of the study incorporates the geochemical processes into the model based on actual data from the rock samples. Their simulation requires extending the two-continuum setup to a multiple continua model with five nested block strings: one for the fractures and four for the rock matrix. This further subdivision prevents under-representations of kinetic reactions with short equilibrium length scales and numerical instabilities due to lack of chemical and flow gradients. As a result, the new multiple continua model provides good agreement with respect to long- and short-term concentrations and discharge trends measured in the mine drainage. The flow of oxygen and meteoric water through the fractured continuum leads to a high and steady release of hydrogen, iron and sulfate ions derived from pyrite oxidation in the matrix continua closest to the fractures. Moreover, high chloride concentrations result from the mixing and gradual release of relatively immobile solutes in the matrix as they interact with percolating water in the fracture. Both findings are equally congruent with the reactive pyrite oxidation and iron hydroxide precipitation fronts identified in the fractured core samples.
In the end, the multiple continua models, the simulation procedure and the results of the benchmark and sensitivity analysis scenarios developed for the Westfield pave the way for the application of the approach in other mining zones. The first candidate emerges in the Ibbenbüren Eastfield, where a coupled elemental-isotopic approach included in this thesis has confirmed that water-conducting fracture zones are primary elements for solute generation and transport in the first 300 meters of the overburden. In the latter case, calibration and verification of the models can be complemented with measurements of δ34S in sulfates and δ18O, δ2H, and Tritium in water.
Introduction
The concept of thermal ablation has proven a minimally invasive alternative or accompaniment to conventional tumour therapy. Patients with hepatic primary tumours or metastases are able to profit from it. Several modalities of thermal ablation exist, including radiofrequency ablation, microwave ablation and laser ablation. They differ in regards to their indications and their physical backgrounds, yet they all share the same aim: the hyperthermic ablation of tumorous target tissue.
At this point in time the maximum ablation diameter attained in a singular session using a singular applicator is about 30 mm. The maximum attainable volume is about 23 cm3. However, the mean and median of hepatic lesions exceed that number with about 50 mm. Most hepatic tumours therefore cannot be easily ablated in toto.
One of the main limitations of thermal ablation is the periprocedural transformation of vital tissue into a boundary layer. This boundary layer prevents efficient energy transmission into peripheral tissue and thus limits the potential of thermal ablation. The boundary layer is usually located centrally around the ablation applicator. In laser ablation the formation of this boundary layer is called carbonisation.
A technically simple, yet potentially effective approach to delay or prevent the formation of this boundary layer is the usage of a spacer. This perfused spacer cools the central zone surrounding the applicator. Therefore central temperatures remain beyond the point of carbonisation.
Methods
The development of two spacer prototypes took place in cooperation with the AG “Experimentelle Radiologie” of the University Clinic Charité. The first fully closed prototype featured an internal circulation of cooling fluid without tissue perfusion. The second open prototype perfused into tissue through an opened tip.
The conduct of this study included ex vivo experiments on bovine livers (n = 15) by means of laser ablation. Ablation diameter and ablation volume were recorded through MR-guided volumetry and manual displacement volumetry. The mean values of diameter and volume that were recorded when the stand-alone applicator system was used were then compared to the mean values recorded when using the closed spacer-supported applicator system and the open spacer-supported applicator system. The difference in values between the three applicator types were then examined for statistical significance using SPSS.
To exclude covariates a preliminary experiment was conducted which aimed to maximise power input of the laser and time interval while minimising the chance of carbonisation. For that, one of the variables was increased in intervals and the ablation diameter of all three applicator types was measured until carbonisation occurred.
Results
In the preliminary experiment it was found that following the increase of the pre-set power input of the laser a proportional increase of ablation diameter followed. However when increasing power input above 25 Watt almost instantaneous carbonisation of the central tissue occurred. This was the same for all three applicator types.
When increasing the time interval > 10 minutes the stand-alone applicator system showed central carbonisation, which was not the case when using the closed spacer-supported applicator system or the open spacer-supported applicator system. The two spacer prototypes only experienced carbonisation when a time interval of > 25 minutes was set. Thus the comparison of all three applicator types was conducted at 25 Watt and 10 minutes, whereas the comparison between the closed spacer-supported applicator system and the open spacer-supported applicator system was conducted at 25 Watt and 25 minutes.
During the first experiment the stand-alone applicator system achieved mean values of 37.50 mm ablation diameter and 23.61 cm3 ablation volume. This was a statistically significant (p < 0.001) increase to the values either spacer was able to attain: the closed spacer-supported applicator system recorded a mean value of 28.67 mm ablation diameter and 18.12 cm3 ablation volume, whereas the open spacer-supported applicator system recorded a mean value of 31.00 mm ablation diameter and 18.49 cm3 ablation volume. However, setting a longer time interval was not possible when the stand-alone applicator system was used for ablation. Due to this, a second experiment comparing mean ablation diameter and volume between the two spacer prototypes followed.
During the second experiment with a time interval of 25 minutes the closed spacer-supported applicator system attained a mean value of 52.07 mm ablation diameter and 75.25 cm3 ablation volume. These values showed a statistically significant (p < 0.001) difference in comparison to the open spacer-supported applicator system with mean values of 47.60 mm ablation diameter und 72.20 cm3 ablation volume.
Discussion
Within the framework of this study it was proven that the presence of a spacer between laser applicator and hepatic tissue was able to achieve a significant increase in ablation diameter and ablation volume. By using a closed spacer an increase in volume by a 3.19 factor of change was possible. The open spacer obtained an increase in volume by a 3.06 factor of change. The concept of using a spacer in thermal ablation as a proof of concept study is therefore valid and suitable for further pre-clinical studies.