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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.
Recent experimental campaigns in the Wendelstein 7-X stellarator, a
plasma-confining device designed to investigate the Magnetic Confinement Fusion
(MCF) approach to generating electrical power, have shown that the injection of
fuelling pellets had an unexpected and considerable impact on the performance of
the plasma. Rather than simply refuelling the device and `diluting' the plasma
energy, pellet injection is followed by a significant increase in the ratio of
the ion temperature to the electron temperature. It has been suggested that this
is not merely due to the improved confinement following the reduction of
turbulent transport after the pellet material has homogenised with the bulk
plasma, but also due to a direct transfer of energy from electrons to ions. The
proposed mechanism for this energy transfer is the ambipolar expansion of the
pellet plasmoid, the localised plasma structure produced by the
ionisation of ablated pellet material, along magnetic field lines.
Early work on pellet plasmoid expansion predicted that half the heating power
deposited in plasmoid electrons by collisions with hot ambient electrons is
transferred to plasmoid ions in the form of flow velocity as the plasmoid
expands. The complicated nature of the system of the pellet plasmoid embedded in
the ambient plasma, particularly the behaviour of electrons, which experience
many collisional and collisionless phenomena on multiple disparate timescales,
means that early models of the expansion were not wholly self-consistent, but
rather made use of strong approximations that apply in some regions of the
plasmoid but not in others. For example, only electrons and ions associated with
the plasmoid were rigorously treated, meaning that the framework was one of
`expansion into vacuum'. Combined with the assumption of Maxwellian electrons,
this led to an electric potential that was unbounded at infinity. Naturally, the
validity of the conclusions of such a model are called into question because the
approximations lose their validity far from the plasmoid and as time advances,
yet predictions about the final state of the plasma are desired. A deeper
investigation is required: careful consideration of the phenomena in question
and the timescales (and lengthscales) on which they act must be made in order to
rigorously construct a model that is valid throughout the entire expansion.
The first two papers presented in this thesis iterate on the model established
in the paper that first predicted the electron-to-ion energy transfer; their aim
was to find out how the character of the expansion changes with a more
sophisticated and accurate description of various phenomena, while remaining
within the existing framework of expansion into vacuum. Ultimately, we find that
the qualitative character is unchanged, and that approximately half the heating
power deposited in plasmoid electrons is transferred to ions.
Two other papers in this thesis address the limitations of the original model.
This is achieved by properly considering the electron kinetic problem in a
plasmoid. One paper considers the electron kinetic problem when electrons are
highly isotropised. In this case the kinetic equation can be integrated to
remove all but two independent variables, which is the maximum possible
reduction considering it is a time-dependent problem. The full nonlinear
integro-differential Landau self-collision operator is integrated exactly and
few approximations are made, leading to a rather general kinetic equation.
However, for fuelling pellets some anisotropy in the electron distribution is
expected. Another paper considers the electron kinetic problem (and the entire
plasmoid expansion) allowing for electron anisotropy. Careful consideration of
the ordering of timescales of electron phenomena in a pellet plasmoid leads to a
steady-state kinetic problem that we call collisional quasi-equilibrium (QE). QE
appears in many ways similar to the collisional steady-state characterising a
true thermal equilibrium. It was found that the time-dependent kinetic problem
of the earlier paper, with isotropic electrons, produces the QE distribution
function, corroborating the existence of the QE state. We then take moments of
the electron kinetic equation that is valid on the expansion timescale, assuming
that the electron distribution is that given as the solution to the QE kinetic
problem. This is completely analogous to what is done to obtain the Braginskii
equations or any Chapman-Enskog theory. The result is a set of equations for the
long-term evolution of the macroscopic quantities that describe the distribution
function existing in a quasi-steady-state at each point in time. It is from this
point that one may feasibly describe the plasmoid expansion with an accurate
picture of the electron kinetics and finally obtain the electron-to-ion energy
transfer so desired in a rigorous model of the expansion.
From a broader point of view, the two frameworks provided by these rigorous
investigations of the electron kinetic problem serve as a basis for the future
study of plasmoids. Such a `first-principles' approach to plasmoid dynamics is
novel and interesting in its own right, but it will be demonstrated that such an
approach is essential for pellet plasmoids owing to the fact that they are
poorly described by the `standard tools' of plasma physics.
Using the QE framework it was found that, once more, about half the heating
power experienced by plasmoid electrons is transferred to plasmoid ions. The
incredible robustness of the prediction of such an energy transfer is, in the
author's opinion, the result of the self-similar nature of the expansion found
as a solution to the original model. As a rule, the profiles of self-similar
solutions tend to be attractors for the `real', more complicated, system, and
the qualitative predictions involving no parameters, of which the
electron-to-ion energy transfer is one, tend to be very sturdy.
Aside from fuelling pellets, composed of hydrogen or deuterium, one paper in
this thesis investigates the physics of high-Z pellets that are designed to
terminate the plasma safely in the event of a `disruption', where much of the
magnetic field energy is channelled into a runaway electron beam with
potentially disastrous consequences if the beam encounters a plasma-facing
component. The paper draws on the work carried out in the paper concerning the
kinetic problem of isotropised electrons in a plasmoid.
This thesis is `cumulative'; the vast majority of the work carried out is
described within a set of Papers, labelled A-E, placed at the back of the text.
There is a preceding `wrapper text' (given in numbered Sections) tasked with
introducing the reader to the topic, guiding the reader through the papers, and
expounding some of their main results. Some amount of material not present in
the papers is also provided in the wrapper text. Naturally, the wrapper text
mainly focusses on the results of the papers which are under my first
authorship. In the course of publishing papers over an extended period of time
the nomenclature is bound to vary. Although it is mostly consistent between the
papers, a few difference do arise, and the section `Common symbols and
subscripts' is provided in the frontmatter to alleviate confusion. Particular
care should be taken with the symbols x and z; both can refer to the
coordinate parallel to the magnetic field line, but in papers where z is used
for this purpose x tends to have another definition. In the wrapper text the
choice of symbols is generally chosen to reflect those in the corresponding
paper.
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.
In den Weltmeeren findet rund die Hälfte der jährlichen globalen Kohlenstofffixierung statt, davon ein großer Anteil in küstennahen Regionen. Hier kommt es zu wiederkehrenden saisonalen Algenblüten, die durch eine zeitlich begrenzte explosionsartige Vermehrung von Mikroalgen (hauptsächlich Diatomeen und Coccolithophoren) charakterisiert sind. Vor allem Frühjahrsblüten (März-Mai) haben aufgrund ihrer zeitlichen und räumlichen Vorhersagbarkeit einen hohen Stellenwert als Modellsysteme, anhand deren sich der Kohlenstoffkreislauf der Meere untersuchen lässt.
Mikroalgen produzieren eine große Vielfalt an Makromolekülen, die für die mit ihnen vergesellschafteten Bakterien als Nahrungsgrundlage dienen. Besonders im Fokus stehen hier die für den Kohlenstoffkreislauf relevanten Polysaccharide. Im Gegensatz zu anderen natürlichen Makromolekülen wie DNA oder Proteinen können Polysaccharide aus vielen verschiedenen Monomeren mit unterschiedlichsten Bindungen bestehen. Zusätzlich finden sich an diesen Zuckermonomeren viele Modifikationen wie Acetylierungen, Methylierungen oder Sulfatierungen, die die Komplexität weiter erhöhen. Diese Variabilität bedingt eine hohe strukturelle und funktionale Diversität. So können Polysaccharide Speicherstoffe, Zellwandbestandteile oder Teile der extrazellulären Matrix darstellen.
Komplementär hierzu besitzen Polysaccharid-verwertende Bakterien entsprechend komplexe, enzymatische Abbaumechanismen. Besonders hervorzuheben sind hier die Bakterien des Phylums Bacteroidota, die sich in verschiedensten Nischen auf den Abbau von Polysacchariden spezialisiert haben. Sie finden sich in Bodenproben, als Teil der menschlichen Darmflora, oder eben auch als bedeutende Begleiter von Algenblüten.
Bacteroidota (und in marinen Systemen hauptsächlich die zu ihnen gehörenden Flavobakterien) besitzen zum Abbau diverser Polysaccharide sogenannte Polysaccharide utilization loci (PULs), genomische Inseln, die alle notwendigen Proteine zur Aufnahme und Abbau eines bestimmten Polysaccharids codieren. Hierzu gehören hochspezifische Enzyme (Carbohydrate-active enzymes, CAZymes), transkriptionelle Regulatoren sowie Transportersysteme, die initial gespaltene Oligosaccharide über die Membran in das Bakterium transportieren, wo sie von weiteren Enzymen vollständig abgebaut werden. Diese Co-Lokalisation der benötigten Gene und deren gemeinsame Regulation stellt einen enormen Selektionsvorteil der Bacteroidota dar und ist der Grund, warum sie, ähnlich wie Algen, einer jährlich wiederkehrenden Sukzession folgen, die sich gut untersuchen lässt.Die Forschungsartikel, die Teil dieser Doktorarbeit sind, untersuchen das Zusammenspiel von Polysaccharid-produzierenden Algen mit den Bakterien, die sie abbauen, aber auch darauf basierende Beziehungen der Bakterien untereinander. Die erste Publikation beschäftigt sich mit dem weit verbreiteten Speicherpolysaccharid α-Glucan, für das der Großteil der blütenbegleitenden Bakterien einen spezifischen aktiven PUL besitzt. Eine Untersuchung der in der Blüte vorhandenen Algenarten bestätigte, dass die Blüte von β-Glucan-produzierenden Algen dominiert wird. Da Bakterien aber selbst α-Glucane als Speicherpolysaccharide verwenden, konnte gezeigt werden, dass nicht die Algen selbst, sondern die Bakterien Hauptproduzent dieser Polysaccharide während einer Phytoplanktonblüte sind. Bakterielle Proteine, die dem Abbau von Algen-β-Glucan und dem daraus folgenden Aufbau von bakteriellem α-Glucan dienen, waren in Umweltproben und in Laborkulturen unter ähnlichen Bedingungen abundant. Die Untersuchung von extrahiertem bakteriellem Polysaccharid bewies, dass dieses nicht nur α-Glucan enthält, sondern dass dieses Polysaccharid auch in der Lage war, α-Glucan PULs mariner Bakterien zu induzieren. Hier zeigte sich ein innerhalb des marinen Kohlenstoffkreislaufs bisher wenig berücksichtigter Kreislauf, indem Bakterien Polysaccharide anderer Bakterien nutzen, die z.B. durch Viren lysiert wurden.
Die anderen zwei Artikel dieser Arbeit befassen sich mit dem Abbau von Zellwandpolysacchariden durch blütenassoziierte Modellbakterien. In einer der Studien wird detailliert der Abbau eines β-Mannans (ein Polysaccharid das hauptsächlich aus dem Monosaccharid Mannose besteht) durch ein Bakterium des Genus Muricauda beschrieben. Die PUL-Struktur dieses Bakteriums kam in mehreren anderen Phytoplanktonblüten-assoziierten Bakterien vor. Diese Beobachtung wies darauf hin, dass es sich hier um ein Mannan mit zusätzlichen Galactose- und Glucose-Substitutionen handelte. Proteom-Untersuchungen bestätigten, dass das Bakterium derartige Substrate unter Induktion des β-Mannan-PULs nutzen können. β-Mannan konnte durch Antikörpermarkierung in Blütenproben sowie spezifischen Mikroalgenarten (Chaetoceros, Coscinodiscus) nachgewiesen werden. Die in dieser Publikation charakterisieren β-Mannan-PUL-codierten Enzyme waren in der Lage, dieses Signal zu löschen, was bewies, dass Muricauda sp. Mannan-basierte Zellwandpolysaccharide bestimmter Arten von Mikroalgen abbauen kann.
Die dritte Studie geht näher auf den Abbau von Xylanen (bestehend aus Xylose) durch ein blütenassoziiertes Bakterium des Genus Flavimarina ein. In diesem Bakterium wurden anhand der enthaltenen Xylanasen zwei putative Xylan-PULs annotiert. Wachstumsexperimente und Proteom-Untersuchungen zeigten, dass einer dieser PULs hauptsächlich bei Wachstum auf Glucoronoxylan induziert wird, während der andere PUL aufArabinoxylane stärker reagierte. Untersuchung der PUL-CAZymes bestätigte diese Ergebnisse durch Charakterisierung mehrerer Xylanasen sowie Glucoronidasen und Arabinofuranosidasen. Zusätzlich codierten beide PULs für Esterasen, die eine Modifikation der natürlichen Substrate durch Acetylierungen oder Methylierungen nahelegen. Da all diese Merkmale von terrestrischen Xylanen geteilt werden und in Blütenproben aus Küstennahen Regionen Xylane nachgewiesen wurden, ist es möglich, dass Bakterien aus solchen Regionen sowohl Xylane terrestrischen Ursprungs (z.B. durch Flusseinspeisung) sowie marinen Ursprungs abbauen können.
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.
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.
Ecological Impacts and Phenotypic Plasticity of a Global Invasive Cactus, Opuntia ficus-indica
(2023)
Biological invasions by non-native species pose one of the major threats to biodiversity, the way ecosystems function, and the well-being of humans. These invasions can occur through various means, including accidental or intentional introductions by humans, natural dispersal, and climate change. Non-native species can harm the native species and ecosystems, by homogenizing plant communities, competing for resources, changing how the ecosystem operates, and eventually causing native species to go extinct. Even though not all non-native species become invasive, changes in climate and ecosystems can cause the successful establishment and spread of non-native species. Despite the advancements in our understanding of biological invasions in recent years, research has been biased towards temperate regions, whereas arid and semi-arid regions that are highly impacted by climate change are underrepresented. Thus, particularly focusing on the impacts of biological invasions in subtropical arid and semi-arid regions, the goal of this PhD project was to explore the effects of an invasive cactus on the local native communities and investigate the mechanisms of its successful invasion. Certain species are found to take advantage of the ever-drying climates in the arid/ semi-arid regions of the world. Opuntia ficus-indica, native to Mexico, is an exceptionally successful drought-tolerant invasive cactus that successfully grows in these regions. O. ficus-indica, a most widespread invasive cactus, is considered an ecosystem engineer as it modifies the habitats of indigenous plant species and dependent animals. This project aimed to identify the ecological impacts of O. ficus-indica in the highlands of Eritrea, the competitive potential of O. ficus-indica and the plastic changes that enabled its spread and invasion (Chapters I-III). For this purpose, field observations and common garden experiments were carried out throughout the project.
We investigated the effects of Opuntia ficus-indica on the spatial diversity of native plant communities (Chapter I), its competitive ability against native species (Chapter II) and the phenotypic plasticity of O. ficus-indica (Chapter III). To investigate the main ecological effects of O. ficus-indica on the native community, field data was collected from the highlands of Eritrea and comparisons were made between O. ficus-indica invaded and noninvaded areas (Chapter I). The study aimed to understand the effects of O. ficus-indica by examining species composition, richness, and diversity across vegetation layers and revealed that O. ficus-indica homogenises the species composition of the native ecosystem. This provides evidence that the presence of O. ficus-indica reduces landscape-level heterogeneity or spatial diversity. However, O. ficus-indica did not influence the species richness and diversity of the local communities. The mechanisms of the successful homogenisation of the local communities by O. ficus-indica were attributed to the potential competitive abilities of O. ficus-indica against the native species, and the plastic and adaptive traits it developed in the non-native ranges. The first assumption was tested by setting up a common garden competition experiment between two native Eritrean species, Ricinus communis and Solanum marginatum (Chapter II). The experiment used two water availability treatments, wet and dry, and categorized plants into intraspecific (native or invasive only) and interspecific (native and invasive) competition. The study evaluated the impacts by comparing the growth of O. ficus-indica alone to the growth alongside native species which revealed the weak competitive potential of O. ficus-indica. However, O. ficus-indica was observed to outgrow the native species in several folds which can be attributed to its successful invasion. The second assumption of the successful spread of O. ficus-indica was attributed to the phenotypic plastic traits adapted by O. ficus-indica in the non-native ranges (Chapter III). The phenotypic plasticity of O. ficus-indica was assessed by exposing it to water stress across dry and wet environments. The species were cultivated from a diverse set of 12 populations, encompassing its native range in Mexico with three cultivars and nonnative ranges in Africa (Algeria, Eritrea, Ethiopia), the island of Madeira off the coast of Africa, and in Europe, Italy with two cultivars and in Portugal from three sites. In Mexico and Italy, we collected various cultivars to ensure a wide representation of genotypes. We found that the species originating from the native range of O. ficus-indica exhibited lower plasticity to conditions of elevated water availability. Furthermore, a trial gradient experiment on O. ficus-indica was conducted to determine the appropriate watering levels for the species and the experiment revealed not only the species' capacity to endure a lack of water for nine months but also its ability to withstand prolonged waterlogged conditions.
This thesis illustrates the fact that invasive species are a major threat to biodiversity and ecosystem functioning worldwide, especially in rarely studied regions with dry climates and limited resources. How can invasive plants spread and cause negative impacts on native ecosystems (Chapter I), despite their weak competitive abilities (Chapter II)? This thesis explored these questions by examining the case of O. ficus-indica, an invasive species in arid/ semi-arid climates (Chapter I). It showed that O. ficus-indica has a high growth potential that allows it to overcome resource limitations, that its growth is not affected by competition from native species (Chapter II), and that it exhibits adaptive plasticity that enhances its invasion success in different environments (Chapter III). This thesis revealed the complex mechanisms and consequences of biological invasions in dry climates and contributes to the understanding of invasive species. It also suggests that more research is needed in understudied regions to assess the impacts of O. ficus-indica or invasive species in general on native biodiversity and ecosystem services and to identify the factors that influence the competitive and adaptive potentials.
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.
Convolutional Neural Network-based image classification models are the current state-of-the-art for solving image classification problems. However, obtaining and using such a model to solve a specific image classification problem presents several challenges in practice. To train the model, we need to find good hyperparameter values for training, such as initial model weights or learning rate. However, finding these values is usually a non-trivial process. Another problem is that the training data used for model training is often class-imbalanced in practice. This usually has a negative impact on model training. However, not only is it challenging to obtain a Convolutional Neural Network-based model, but also to use the model after model training. After training, the model might be applied to images that were drawn from a data distribution that is different from the data distribution the training data was drawn from. These images are typically referred to as out-of-distribution samples. Unfortunately, Convolutional Neural Network-based image classification models typically fail to predict the correct class for out-of-distribution samples without warning, which is problematic when such a model is used for safety-critical applications. In my work, I examined whether information from the layers of a Convolutional Neural Network-based image classification model (pixels and activations) can be used to address all of these issues. As a result, I suggest a method for initializing the model weights based on image patches, a method for balancing a class-imbalanced dataset based on layer activations, and a method for detecting out-of-distribution samples, which is also based on layer activations. To test the proposed methods, I conducted extensive experiments using different datasets. My experiments showed that layer information (pixels and activations) can indeed be used to address all of the aforementioned challenges when training and using Convolutional Neural Network-based image classification models.
Hepatitis E virus (HEV) is emerging worldwide as a zoonotic pathogen that has remained largely undetected for decades, if not centuries. Its enormous success can be attributed to the wide range of host species, which can transmit the virus to humans, depending on the viral genotype. As a result, HEV is likely to remain a challenge even when the remaining hepatitis viruses (HAV, HBV, HCV), which are transmitted exclusively between humans, are under control. Although millions of HEV infections occur each year, little is known about this puzzling pathogen. One major issue in HEV research is the lack of reliable model systems. Established animal models are inefficient, expensive, or simply not representative of human HEV. On the other hand, cell culture systems are limited by the slow growth of the virus and inefficient replication and infection. The aim of this work is to with deepen the understanding of zoonotic HEV in animal hosts in Germany. For this purpose, a molecular and phylogenetic characterization of HEV sequences from rabbits and swine was conducted. A novel subtype of the zoonotic genotype HEV-3 was identified in a rabbit sample, further emphasizing the role of rabbits as HEV host species and possible reservoir of zoonotic HEV infections in Germany. On the other hand, a molecular biological screening of pigs and wild boars in Mecklenburg-Western Pomerania indicates a wide range of HEV-3 subtypes circulating in swine in north-east Germany. Furthermore, an optimized replicon system was established in order to enable characterization of various HEV sequences by reverse genetics. As a proof of concept, two rabbit HEV derived replicons were compared with two established, cell culture adapted HEV strains. The influence of different regions of the nonstructural protein on HEV replication was determined and quantified. In particular, a system was established, to reproducibly compare different strains and genotypes. This refined replicon system will enable the characterization of further HEV sequences and thus expand the knowledge on the determinants of the viral life cycle.
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.
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.
Study of the effect of the podocyte-specific palladin knockout in mice with a 129 genetic background
(2023)
Worldwide, chronic kidney disease is one of the leading public health problems. Podocytes, highly specialized postmitotic cells in the filtration unit of the kidney glomerulus, are essential for the size selectivity of the filtration barrier. Loss of the complex 3D morphology of their interdigitating foot processes, effacement and detachment of the cells from the capillaries lead to proteinuria and often loss of kidney function.
Since the morphology of podocyte foot processes is highly dependent on an intact actin cytoskeleton and actin-binding proteins, we investigated the role of the actin-binding protein palladin in podocytes from mice with a 129 genetic background, that is more susceptible to kidney injury. PodoPalld129-/- mice were examined at 6 and 12 months of age using immunofluorescence staining, electron and 3D super-resolution microscopy as well as qRT-PCR.
Our analysis of PodoPalld129-/- mice at 6 and 12 months of age showed that podocyte- specific knockout of palladin results in dilation of the capillary tuft accompanied by loss of mesangial cells, indicating the influence of palladin on glomerular tuft formation. Besides, we observed morphological abnormalities such as an enlarged sub-podocyte space, cyst formations and an increased number of cell-cell contacts between podocytes and parietal epithelial cells in PodoPalld129-/- mice compared to controls. Moreover, palladin knockout resulted in downregulation of the slit diaphragm protein nephrin as well as an age-dependent significant increase in podocyte foot process effacement. Although there was a significant change in foot process morphology, we did not detect albuminuria in PodoPalld129-/- mice of both age groups. However, we found an increase of trefoil factor 1 (Tff1) in the urine of the mice, indicating an altered, more permeable filtration barrier.
Considering that palladin has several binding sites for important actin-binding and regulatory proteins, we studied the expression of Lasp-1, Pdlim2, VASP and Klotho in dependence on palladin. We found a remarkable reduction in, for example, phosphorylated Lasp-1 as well as Klotho, which could influence the morphology of podocyte foot processes.
Compared with PodoPalldBL/6-/- mice, PodoPalld129-/- mice showed stronger glomerular tuft dilation and developed podocytes with increased morphological abnormalities, underlining the importance of the genetic background.
In conclusion, these results demonstrate the essential role of palladin for podocyte morphology in mice with a 129 genetic background.
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.
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.
Research into nuclear physics has enjoyed a long and rich history since the earliest experiments began investigating atomic constituents. The discovery of the atomic nucleus in the early 20th century started a complex field of research that has undergone many transformations with the advancements of modern technology. Today, atomic nuclei are not only studied to advance our understanding of the strong force but also to gain more information on the synthesis of elements in the universe, to exploit nuclear decay to investigate the weak interaction, and to search for physics beyond the standard model.
In this work, we will study the strong force in atomic nuclei, i.e. the way nucleons (protons and neutrons) arrange themselves in a many-body system governed by the repulsive Coulomb interaction and the attractive strong interaction. In particular, we will focus on nuclear structure near nuclei with a "magic number" of Z protons and N neutrons, so-called doubly-magic nuclei, exhibiting a particularly stable configuration with respect to neighboring nuclei.
Within the nuclear shell model, similar to the atomic shells, the magic numbers indicate shell closures accompanied by energy gaps. Nuclei at double-shell closures and their direct vicinity provide an important playground to benchmark nuclear theories and models that aim to predict the intricate interplay of the nucleons that lead to enhanced nuclear binding energies, significant changes in charge radii and transition strengths, etc.
Of particular interest are nuclear isomers, long-lived excited states, in which the nucleon configuration with respect to its ground state is altered, resulting in a modification of their properties despite having the same number of protons and neutrons.
The main part of this work consists of three publications, which report on nuclear structure investigations through mass measurements and laser spectroscopy near the doubly magic nuclei nickel-78, tin-100, and lead-208.
The nuclides investigated in this work include neutron-deficient indium isotopes, neutron-rich zinc isotopes, and neutron-rich mercury isotopes.
Although the outcome of patients with acute myeloid leukemia (AML) has
improved in the past decades, the overall survival is below 50% [1, 2] and there
is still an unmet need for the development of new therapeutic strategies. Here,
we aimed to identify functional vulnerabilities in AML and investigated the
therapeutic potential of target structures involved in proteostasis, cell polarity and
RNA-binding molecular pathways.
We determined that genetic deletion of the cell fate determinant and polarity
regulator Scribble delays AML development, however, its deletion also seems to
affect the proliferative capacity of normal hematopoietic cells, lowering its value
as a therapeutic target. In contrast, inactivation of YBX1 (a pleiotropic protein with
DNA/RNA binding capacity that excerpts post-transcriptional control on its
targets) and PSMB8/LMP7 (a catalytic subunit of the immunoproteasome multiprotein
complex that belongs to the ubiquitin-proteasome system (UPS)) inhibit
leukemic cells without influencing normal hematopoietic stem and progenitor cell
function, establishing these targets as potential novel therapeutic strategies
against AML.
Genetic deletion of YBX1 caused reduced proliferation and colony forming
capacity in leukemic cells independent of the oncogenic driver mutation and
delayed AML development in vivo. The role of Ybx1 in leukemia maintenance
was investigated using a conditional knockout model, confirming the functional
requirement of Ybx1 in AML maintenance. Mechanistically, YBX1 recruited
oncogenic transcripts to polysomes, increasing their translation. Displacement of
these transcripts from polysomes after YBX1 deletion decreased their protein
expression.
Genetic and pharmacologic inhibition of PSMB8/LMP7 decreased proliferation
and colony forming capacity selectively in KMT2A (MLL)-rearranged leukemic
cells. In vivo treatment with a PSMB8/LMP7 inhibitor delayed disease
development in KMT2A-rearranged leukemic mice or patient derived xenografts
(PDX). We identified the transcriptional corepressor BASP1 as a functional
effector of the immunoproteasome. BASP1 was enriched after PSMB8/LMP7
inhibition and it was found binding to KMT2A-target genes. Moreover,
pharmacologic inhibition of PSMB8/LMP7 led to decreased expression of bonafide
KMT2A-fusion target genes and enrichment for genes deregulated by
inhibitors of the KMT2A complex partners DOT1L and MEN1. This prompted us
to investigate a potential synergism between MEN1 inhibition and
immunoproteasome inhibition. Combination treatment in AML cells revealed
decreased proliferation in vitro and increased survival in vivo as compared to the
single treatments, demonstrating the therapeutic potential of combining
immunoproteasome and MEN1 inhibitors.
This thesis presents the production of polyanionic clusters within two ion storage devices:
Considering a Penning trap, the accessible range of polyanionic aluminium clusters has been expanded up to the 10th charge state. In particular, abundance curves for clusters with 5 to 9 excess electrons have been measured for the first time and analysed with respect to their lifetime-dependent appearance sizes. These sizes reveal a nearly quadratic dependency on the charge state for experimentally accessible lifetimes.
Additionally, the production of polyanionic clusters has been enabled in a radiofrequency ion trap. Therefore, the transition from a harmonic to a digital 2- and 3-state guiding signal has been investigated with respect to the ion storage. The passing of electrons through the trap during field-free periods of the guiding signal led to the first production of polyanionic clusters within a radiofrequency ion trap.
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 thesis investigates the occurrence of the Early Modern European witch-hunt within the distinctively diverse society of the Grand Duchy of Lithuania. Positioned at the intersection of Latin and post-Byzantine cultures, along with Western and Eastern Christianity, this region lay on the frontlines of the Reformation and Counter-Reformation. The research aims to analyze the specific characteristics of the witch-hunt in this area, considering it a case study of social and cultural interaction within a borderland. It focuses particularly on identifying the distinctive aspects of the Lithuanian witch-hunt, examining the social and cultural roots of the witch trials, and exploring their relationship to the broader social and cultural developments of the period.
Central to this study is a detailed examination of the witch trials and an analysis of court materials. The thesis posits a socio-cultural interpretation of witch persecutions, arguing that they were culturally influenced manifestations of social tensions, enacted through legal mechanisms. The emergence of new Early Modern challenges, such as the social consequences of agrarian reform, the expansion of manorialism, and serfdom, led to novel tensions, conflicts, and responses, including accusations of witchcraft. The importation of authoritative foreign ideas about witchcraft reinvigorated, facilitated, and shaped pre-existing moderate indigenous beliefs, a process facilitated by religious struggles and Catholic post-Tridentine confessionalization. The Lithuanian legal system provided an environment conducive to an intensive witch-hunt, with witchcraft being a secular grave felony tried in highly decentralized and poorly supervised courts. However, this potential was largely unrealized. The study argues that the cultural diversity of the society played a major role in inhibiting the spread of Western witchcraft discourse, thereby limiting the extent of the witch-hunt in the Grand Duchy of Lithuania.