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This paper presents continuous, high resolution fossil pollen and microcharcoal records from Bo Langvlei, a lake in the Wilderness Embayment on South Africa’s southern Cape coast. Spanning the past ~1300 years and encompassing the Medieval Climate Anomaly (MCA; c. AD 950–1250) and the Little Ice Age (LIA; c. AD 1300–1850), these records provide a rare southern African perspective on past temperature, moisture and vegetation change during these much debated periods of the recent geological past. Considered together with other records from the Wilderness Embayment, we conclude that conditions in the region during the MCA chronozone were – in the context of the last 1300 years – likely relatively dry (reduced levels of Afrotemperate forest pollen) and perhaps slightly cooler (increased percentages of Stoebe-type pollen) than present. The most significant phase of forest expansion, and more humid conditions, occurred during the transition between the MCA and the most prominent cooling phase of the LIA. The LIA is clearly identified at this locality as a period of cool, dry conditions between c. AD 1600 and 1850. The mechanisms driving the changes observed in the Bo Langvlei pollen record appear to be generally linked to changes in temperature, and changes in the influence of tropical circulation systems. During warmer periods, moisture availability was higher at Bo Langvlei, and rainfall was perhaps less seasonal. During colder periods, precipitation resulting from tropical disturbances was more restricted, resulting in drier conditions. While increased precipitation has been reported during the LIA from Verlorenvlei in the Western Cape as a result of an equatorward displacement of the westerly storm-track at this time, the opposing response at Bo Langvlei suggests that any increased influence of westerlies was insufficient to compensate for the concurrent reduction in tropical/local rainfall in the region.
In recent years, negative impact of pharmaceutical products on natural environment became an issue of high public interest. Pharmaceutical residues are detected in various ecosystems worldwide. Due to increasing production and consumption of medicines this problem is intensified. Therefore, an efficient way to restrain release into the world’s water system is required.
This work presents an enzymatic approach for the degradation of pharmaceuticals in wastewater treatment plants, using laccase and cytochrome P450 — two enzymes of high biotechnological and industrial potential. Laccase genes from fungi Trametes versicolor and Pycnoporus cinnabarinus were isolated and overexpressed in the non-conventional yeast Arxula adeninivorans. This organism served also as cytochrome P450 gene donor.
Recombinant laccase Tvlcc5 was purified by immobilized-metal ion affinity chromatography and biochemically characterized using 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) as substrate for enzyme activity assays. The optimal temperature and pH were found to be 50 °C and 4.5–5.5, respectively. The half-life of Tvlcc5 at 60 °C was around 20 min. It was demonstrated that the presence of copper ions is essential for the synthesis of active protein. Moreover, negative impact of chloride anions on laccase activity was shown.
Cultivation conditions for the Tvlcc5 producing strain A. adeninivorans G1212/YRC102-TEF1-TVLCC5-6H were optimized. It was found that maintaining the pH at a constant level between pH 6.0 and 7.0 is essential for the production of active enzyme. Optimal cell growth and laccase accumulation were reached at 20 °C and in medium supplemented with 0.5 mM CuSO4. Performed fed-batch cultivation resulted in a laccase activity of 4986.3 U L-1.
Factors influencing the synthesis of Tvlcc5 leading to increased production of this protein were investigated. It was found that using three non-native signal peptides (cutinase 2 from A. adeninivorans (ACut2), α-mating factor from S. cerevisiae (MFα), and acid phosphatase from P. pastoris (PHO1) signal peptides) enhances the secretion of active enzyme by 20–80%. Besides that, additional overexpression of copper transporters positively affects laccase production.
Finally, it was proven that recombinant Tvlcc5 is a promising agent for the degradation of certain pharmaceuticals. After 24 h of incubation, the concentration of diclofenac and sulfamethoxazole decreased to 46.8% and 51.1%, respectively. Furthermore, it was shown that the addition of the redox mediator ABTS significantly shortens the degradation time of these substances.
Mathematical phylogenetics provides the theoretical framework for the reconstruction and analysis of phylogenetic trees and networks. The underlying theory is based on various mathematical disciplines, ranging from graph theory to probability theory.
In this thesis, we take a mostly combinatorial and graph-theoretical position and study different problems concerning phylogenetic trees and networks.
We start by considering phylogenetic diversity indices that rank species for conservation. Two such indices for rooted trees are the Fair Proportion index and the Equal Splits index, and we analyze how different they can be from each other and under which circumstances they coincide. Moreover, we define and investigate analogues of these indices for unrooted trees.
Subsequently, we study the Shapley value of unrooted trees, another popular phylogenetic diversity index. We show that it may fail as a prioritization criterion in biodiversity conservation and is outcompeted by an existing greedy approach. Afterwards, we leave the biodiversity setting and consider the Shapley value as a tree reconstruction tool. Here, we show that non-isomorphic trees may have permutation-equivalent Shapley transformation matrices and identical Shapley values, implying that the Shapley value cannot reliably be employed in tree reconstruction.
In addition to phylogenetic diversity indices, another class of indices frequently discussed in mathematical phylogenetics, is the class of balance indices. In this thesis, we study one of the oldest and most popular of them, namely the Colless index for rooted binary trees. We focus on its extremal values and analyze both its maximum and minimum values as well as the trees that achieve them.
Having analyzed various questions regarding phylogenetic trees, we finally turn to phylogenetic networks. We focus on a certain class of phylogenetic networks, namely tree-based networks, and consider this class both in a rooted and in an unrooted setting.
First, we prove the existence of a rooted non-binary universal tree-based network with n leaves for all positive integers n, that is, we show that there exists a rooted non-binary tree-based network with $n$ leaves that has every non-binary phylogenetic tree on the same leaf set as a base tree.
Finally, we study unrooted tree-based networks and introduce a class of networks that are necessarily tree-based, namely edge-based networks. We show that edge-based networks are closely related to a family of graphs in classical graph theory, so-called generalized series-parallel graphs, and explore this relationship in full detail.
In summary, we add new insights into existing concepts in mathematical phylogenetics, answer open questions in the literature, and introduce new concepts and approaches. In doing so, we make a small but relevant contribution to current research in mathematical phylogenetics.
An experimental investigation of particle parallel flows has been carried out at Wendelstein 7-X (W7-X), one of the most advanced stellarators in the world. The studies are restricted to the outermost plasma region, the scrape-off layer (SOL), which is shaped to tackle the exhaust problem in vision of future fusion reactors based on plasma magnetic confinement. The aim of the measurements is to set the basis for a physics analysis of the SOL dynamics by obtaining direct information on convective heat transport, together with the assessment of the predominant flow directions of the main plasma ions and of fusion-products or wall-released impurities. In this way, a better comprehension of the interplay between the transport parallel and perpendicular to the SOL field lines can be achieved, contributing to the understanding of the effectiveness of the island divertor configuration.
The chosen instrument for the experimental studies is the Coherence Imaging Spectroscopy (CIS) diagnostic, a camera-based interferometer capable of measuring 2D Doppler particle flows associated with a selected visible line from the plasma. The diagnostic is distinguished by its high time resolution and spatial coverage, allowing the visualisation and measurements of flow velocities for a full module of W7-X simultaneously. A CIS diagnostic has been fully designed for W7-X with an improved level of accuracy achieved thanks to the implementation of a new calibration source, a continuous-wave-emission tunable laser. The laser allowed a full characterization of the diagnostic and a frequent precise calibration, making the CIS system reliable for parallel flow investigations during the operational campaign OP1.2. The validity and importance of the CIS measurements have been further confirmed with dedicated simulation of the SOL plasma parameters by the EMC3-EIRENE code, and by comparisons with other edge diagnostics. The CIS results show the effects related to dynamical changes in the SOL due to impurity gas puffs or the development of a plasma current. Moreover, CIS can be used as a powerful tool to test the limits of the current theoretical models, for example in the case of forward and reversed field experiments.
The non-renewable energy sources coal, oil and natural gas that contribute the major share of the world's energy, will be running out in the next 40-80 years. With the growing energy demands especially in developing countries, which is likely to surpass that of the developed countries in next 50 years, an alternate energy source is the need to the hour. The nuclear fusion energy is foreseen as one of the potential candidates to solve the current global energy crisis. One of the major challenges faced by the fusion community is the problem of power exhaust. With the larger fusion devices to be built in the future, the heat load on the plasma facing components are expected to grow higher. The present work explores two numerical studies performed on the Wendelstein 7-X, the world's largest stellarator type fusion device, to cope with this problem.
The first project on `'Numerical Studies on the impact of Connection Length in Wendelstein 7-X'' identifies magnetic configuration with long connection lengths, which could bring down the peak heat fluxes onto the divertor to manageable levels, by greater role of cross-field transport which may assist to get a wider heat deposition profile. The second project on `'Development of Heating Scenario to Reduce the Impact of Bootstrap Currents in Wendelstein 7-X'' advocates a novel self-consistent approach to reach high plasma density at full heating power without overloading the divertor during the transient phase of the evolution of the toroidal plasma current, by controlling two parameters; density and power. The aim of both the projects is to contribute to tackling the challenge of the tremendous power exhaust from fusion plasma which, if solved, will be a large step closer to a fusion power plant.
Research on the science and the fiction of supercritical fluid chromatography (SFC) has been ongoing for more than five decades. Today, packed column SFC promises speedy solutions to chiral and semi-preparative separation problems, but academia has been reluctant to incorporate SFC into its curriculum, as doubts linger concerning its practicability. This work sought to explore the merits of SFC in hyphenation with electrospray ionization--single quadrupole mass spectrometry (ESI-MS) and supercritical fluid extraction (SFE) in various aspects of medicinal chemistry and bioanalysis within an academic setting.
SFC was investigated for its usefulness in assessing the purity and the stability of synthesis products, and the quantification of chiral and achiral metabolites - domains conventionally occupied by high performance liquid chromatography (HPLC).
Confronted with analytes prone to hydrolysis (cyclic polysulfides) and UV-induced configurational changes (aza-stilbenes), fast elution by water-free SFC-MS proved complementary to traditional chromatographic techniques.
The quantification of antidepressant ketamine metabolites presented an opportunity to assess supercritical fluid techniques within a bioanalytical context. While SFC hyphenated to single quadrupole MS did not reach the sensitivity levels of HPLC coupled to triple quadrupole MS/MS, exploitation of supercritical CO2 reduced analysis times more than six-fold (60 minutes by HPLC vs 10 minutes by SFC). When coopted for both extraction and analysis, SFE-SFC-MS simplified sample preparation and promoted the transition from off- to on-line bioanalysis. Similar results were obtained when SFC was applied to acidic and basic metabolites of the controversial anodyne flupirtine. Again, SFC featured shorter run times but also expanded the target metabolite spectrum covered within one run.
Finally, a tiered approach to validation demonstrated the reliability achievable by SFC. Critical applications such as quantification of the newly approved antidepressant ketamine or the recently withdrawn analgesic flupirtine were comprehensively validated according to guidelines on bioanalytical method validation by the European Medicines Agency. Notably, this included the first fully validated chromatographic methods for the putative antidepressant (2R,6R)-6-hydroxynorketamine, and the first report of EMA-conforming quantification by on-line SFE-SFC-MS from urine.
Separation scientists find themselves confronted with diverse problems and tools. Although parsing only a microscopic subsection of the available chemical and analytical space, the results obtained here suggest SFC to be a fast and versatile addition to conventional chromatographic methods employed at the intersection of medicinal chemistry and bioanalysis.
In this work, studies with respect to the exhaust problem were performed
in the stellarator experiment Wendelstein 7-X with different target concepts and different magnetic field geometries. Different infrared cameras were used to study the heat flux from the plasma onto the PFC. In the first publication, the limiter set-up was used with a simpler magnetic topology in the plasma edge. The radial fall-off of the parallel heat flux for inboard limiters in W7-X shows, similar to inboard limiters in tokamaks, two different radial fall-off lengths, a short (narrow) one, characterizing the near-SOL, and a long (broad) characterizing the far-SOL. For the far-SOL, the heating power and connection length have been identified as the main scaling parameters, while for the near-SOL, the electron temperature close to the LCFS has been identified as the main scaling parameter. The two fall-off lengths differ by a factor 10, and the found scalings for both regimes differ from known models and experimental scalings in tokamaks. A turbulent-driven feature was discussed in the publication as a possible explanation for the behavior of the fall-off length in W7-X.
The gained information and data have been further used to support many
other publications, covering the symmetry of the heat loads, the
energy balance of the machine, and seeding experiments.
The heat exhaust in W7-X with an island divertor was studied in the second
and third publication. Definitions of parameters such as peaking factor and
wetted area were applied for the heterogeneous heat flux pattern on the
W7-X divertor. It was shown that the island divertor concept is capable
of spreading out the heat efficiently, resulting in large wetted areas of up to 1.5 m2. The reached values for the wetted area are comparable to the ones of the larger tokamak JET but with a much smaller ratio of wetted
area to the area of the last closed flux surface. Furthermore, a positive
scaling of the wetted area with the power in the SOL was observed. This
scaling is beneficial for future reactors but needs further investigation of the involved transport processes. The peaking factor (discussed in the second publication) describes how concentrated the heat load is within the region of the strike line. It was shown that this factor is decreasing for increasing densities without affecting the wetted area. The present work paves the way for further analysis of the transport processes of the heat flux towards the island divertor of Wendelstein 7-X.
Species have to cope with climate change either by migration or by adaptation and acclimatisation. Especially for long-living tree species with a low seed dispersal capacity (e.g. European beech, hereafter called beech), the in situ responses through genetic adaptation and phenotypic plasticity play an important role for their persistence. Beech, the dominant climax tree species in Central Europe, shows a high drought sensitivity and its distribution range is expected to shift northwards. On the other hand, projected northward shifts need to be taken with caution, as some studies suggest a sensitivity of beech to frost events in winter and spring. However, studies on the growth performance of cold-marginal beech populations are still rare. Previous studies on beech populations found local adaptation to drought and phenotypic plasticity in fitness-related traits as well as phenological traits. However, studies on the regeneration of beech under natural conditions are yet missing, although germination and establishment of young trees are a very first selective bottleneck and are crucial for tree population persistence and for successful range shifts.
This PhD-thesis aimed to identify the potential of plasticity and local adaptation in the important early life-history traits germination, establishment after the 1st year, and survival after the 2nd year in a reciprocal transplantation experiment at 11 sites across and even beyond the distribution range of beech (Manuscript 1). Moreover, this thesis investigated the climate sensitivity and the adaptation potential of beech populations by conducting dendroecological studies along a large climatic gradient across the distribution range (Manuscript 2) and along a strong winter temperature gradient towards the cold distribution margin in Poland (Manuscript 3). In addition, the impact of local climatic singularities was studied in a local study at the southern margin (Manuscript 4).
Warm and dry conditions limited natural regeneration, which was indicated by very low survival of young trees, even though germination rates increased with increasing temperature (Manuscript 1). This was also the case in parts of the distribution centre due to the hot and dry conditions in 2018. Although the transplantation experiment revealed high plasticity in the early life-history traits, this plasticity might thus not buffer against climate change under dry conditions. Local adaptation was not detected for any of these traits along the climatic gradient. In contrast, the results of the dendroecological study across the gradient (Manuscript 2) hint towards an adaptation potential of adult trees to drought at the southern margin. Thus, adult trees seemed to be adapted to drought at the southern margin, whereas tree growth in the distribution centre was sensitive to drought. These results indicate that parts of the centre may become ecologically marginal with increasing drought frequency in times of climate change. Interestingly, Manuscript 4 shows that beech growth was positively influenced by frequent fog immersion at the southern distribution margin in north-eastern Spain. This study underlines the importance of local climatic singularities, as they may allow marginal populations to grow in climate refugia in an otherwise unfavourable climate.
At the cold distribution margin, the study in Manuscript 1 found a remarkably higher survival of young trees in Sweden than in Poland. Moreover, the dendroecological studies revealed that beech was hampered by both drought at the cold-dry margin (Manuscript 2) and by winter cold at the cold-wet margin in Poland (Manuscript 3). All these results highlight the importance to study climate sensitivity of adult trees and the response of early life-history traits at the cold margin with a more differentiated view comparing cold-dry against the cold-wet populations and growing conditions. However, the high plasticity of the early life-history traits may allow for an increasing germination rate with climate warming at the northern margin and may thus facilitate natural regeneration there. In contrast, the dendroecological studies suggest that adult trees at the cold distribution margin may suffer either from drought or from winter cold and that the risk for spring frost may increase. Thus, the often-predicted compensation of dry-marginal population decline by a northward range expansion should be discussed more critically.
In conclusion, my PhD thesis provides new knowledge about the potential of natural regeneration and about climate sensitivity of adult trees across the distribution range of beech. Moreover, it underlines the importance to study both the young tree stages as well as adult trees to assess the performance and vulnerability of tree species under climate change, as both showed differences in their response to changing environmental conditions.
Lipoproteins of Staphylococcus aureus represent a major class of surface proteins, which are anchored to the outer leaflet of the cell membrane. Although they play a key role in the immune response and virulence, the majority of lipoproteins in this organism is still of unknown function. The aim of our study was to investigate the function of so far poorly or uncharacterized lipoproteins in S. aureus strain Newman. To this end, an integrated bioinformatical approach was applied to define the pan-lipoproteome of 123 completely sequenced S. aureus strains. In total, this analysis predicted 192 different potential lipoproteins, with a core lipoproteome of 39 and a variable lipoproteome of 153 lipoproteins. Out of those 192 lipoproteins, 141 are so far functionally uncharacterized. Primarily focusing on members of the core-lipoproteome with unknown or poorly characterized function, 24 lipoproteins or co-encoded neighbor proteins were selected for further characterization. Of those 24 proteins, 20 S. aureus markerless deletion mutants were constructed (S. aureus delta l01 - delta l20) and screened for an altered growth behavior under various conditions. Here, three mutants showed a temperature-sensitive phenotype, two mutants formed aggregates in the TSB of the manufacturer Merck (TSBMerck), and four mutants showed reduced growth under osmotic stress with 8% NaCl. An altered aggregation behavior was observed for four mutants in the presence of Triton X-100 and for eleven mutants in the presence of SDS. Furthermore, ten mutants revealed an impaired biofilm formation capacity as well as reduced hemolytic activity. Interestingly, S. aureus deletion mutants delta l14 (delta NWMN_1435) and delta l16 (delta NWMN_0646) showed an altered phenotype under nearly all tested growth and stress conditions. Most strikingly, both deletion mutants demonstrated dramatic defects in cell morphology and cell division during the transient growth phase in TSBMerck and were therefore selected for further detailed characterization. Electron microscopy imaging of the two mutants revealed an irregular cell shape, increased cell size, multiple displaced division septa, and incomplete separation of daughter cells resulting in the formation of cell aggregates in TSBMerck. Complementarily, microarray-based transcriptome analysis and whole-genome sequencing of S. aureus delta l14 and delta l16 suppressor mutants strongly point to a functional association of both lipoproteins with cell envelope- or cell division-related processes. Specifically, multiple hints suggest a functional connection of both lipoproteins with lipo- or wall teichoic acids. Of note, the phenotypes of S. aureus delta l14 and delta l16 are conditional and appear under some, but not all growth conditions. Thus, it is conceivable that the function of L14 and L16 is modulated by metabolic processes, or that the proteins might be part of a “backup system” becoming important only under certain conditions. Collectively, we propose that L14 and L16 fulfill a basic role in cell envelope- or cell division-related processes under specific growth conditions. Particularly, the activity of L14 and L16 might be necessary for the function or localization of lipo- or wall teichoic acids, and thus, might be linked to the regulation of autolysins. In conclusion, this study reveals important insights into the function of two so far uncharacterized but highly conserved lipoproteins in S. aureus.
The global prevalence of kidney diseases has been steadily rising over the last decades. Today, around 10% of the world population suffers from relevant chronic kidney disease. Podocytes are highly specialized and terminally differentiated cells residing in the filtering units of the kidneys, the so-called glomeruli. With their interdigitating foot-processes, these cells are a crucial part of the renal filtration barrier. As podocytes are post-mitotic, injury or loss of these cells results in an impairment of the filtration barrier with subsequent loss of global kidney function. Therefore, the question whether a relevant amount of podocytes can be regenerated and if this regeneration can be influenced is crucial for future therapeutic developments. As in vivo microscopic imaging of podocytes in higher animals like mice or rats is rather challenging, larval zebrafish have been applied as an animal model for podocyte development and kidney filtration. 48 hours post fertilization, zebrafish larvae develop a single filtering glomerulus with a similar morphology and molecular construction to that in mammals. For evaluation of podocyte morphology and filtration, we used transgenic zebrafish strains in which podocytes were labeled with fluorescence proteins. Additionally, podocytes expressed the bacterial enzyme nitroreductase fused to the fluorescence protein mCherry. In this model, application of the antibiotic metronidazole leads to podocyte-specific cell death. Through cross-breeding we established strains that additionally express an eGFP-labeled protein in the blood plasma. Using in vivo two-photon microscopy, we could image podocyte-loss induced impairments of the glomerular filtration barrier. Additionally, we tracked characteristic morphological changes of podocyte morphology including podocyte foot process effacement, development of sub-podocyte pseudocysts and finally detachment of whole cells from the glomerular basement membrane. These changes have been before described histologically in different animal models as well as in patient biopsies. Using the in vivo microscopy approach, we could clearly describe the temporal sequence of these alterations. Finally, we also tracked individual, non-detached podocytes over up to 24 hours, and found that these cells were non-migratory. These results show that early podocyte-regeneration through immigration of intra- or extraglomerular cells is unlikely within the first 24 hours of acute glomerular injury.