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Sonstige beteiligte Institutionen
- VolkswagenStiftung (24)
- Johns Hopkins School of Medicine (2)
- Bio-Imaging Center Würzburg (1)
- CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - the development agency of the Brazilian Federal Government (1)
- Center for Nanosystems Chemistry (CNC), Universität Würzburg (1)
- DAAD - Deutscher Akademischer Austauschdienst (1)
- Department of Hematology and Oncology, Sana Hospital Hof, Hof, Germany (1)
- Department of Laboratory Medicine and Medicine Huddinge, Karolinska Institutet and University Hospital, Stockholm, Sweden (1)
- Department of Medicine A, University Hospital of Münster, Münster, Germany (1)
- Ernst Strüngmann Institute for Neuroscience in Cooperation with Max Planck Society (ESI) (1)
ResearcherID
- B-4606-2017 (1)
The work at hand discusses various universality results for locally univalent and conformal metrics.
In Chapter 2 several interesting approximation results are discussed. Runge-type Theorems for holomorphic and meromorphic locally univalent functions are shown. A well-known local approximation theorem for harmonic functions due to Keldysh is generalized to solutions of the curvature equation.
In Chapter 3 and 4 these approximation theorems are used to establish universality results for locally univalent functions and conformal metrics. In particular locally univalent analogues for well-known universality results due Birkhoff, Seidel & Walsh and Heins are shown.
The phytohormone auxin performs important functions in the initiation of plant tissues and organs, as well as in the control of root growth in conjunction with external stimuli such as gravity, water and nutrient availability. These functions are based primarily on the auxin-dependent regulation of cell division and elongation. Important for the latter is the control of the cell turgor by the vacuole. As storage for nutrients, metabolites and toxins, vacuoles are of vital importance. Vacuolar stored metabolites and ions are exchanged across the vacuolar membrane with the cytoplasm via active transport processes as well as passively through ion channels. In their function as second messenger, calcium ions are important regulators but also subject to vacuolar transport processes. Changes in the cytosolic calcium concentration not only act locally, but are also associated with signal transduction over longer distances. In this work, electrophysiological methods were combined with imaging techniques to gain insights into the interaction between cytosolic calcium signals, vacuolar transport processes and auxin physiology in the intact plant organism.
Calcium signals are involved in the regulation of vacuolar ion channels and transporters. In order to investigate this in the intact organism, intracellular microelectrode measurements were performed in the model system of bulging Arabidopsis thaliana root hairs. By means of the two-electrode voltage-clamp technique, it could be confirmed that the vacuolar membrane is the limiting electrical resistance during intravacuolar measurements and thus measured ion currents actually represent only the currents across the vacuolar membrane. The already known time-dependent decrease of vacuolar conductivity during intravacuolar experiments could be further correlated with an impalement-related, transient increase of the cytosolic calcium concentration. Intravacuolar voltage-clamp experiments in root hair cells of calcium reporter plants confirmed this relationship between vacuolar conductivity and the cytosolic calcium concentration.
However, the vacuole is not just a recipient of cytosolic calcium signals. Since the vacuole represents the largest intracellular calcium reservoir, it has long been argued that it is also involved in the generation of such signals. This could be confirmed in intact root hair cells. Changes in the vacuolar membrane potential affected the cytosolic calcium concentration in these cells. While depolarizing potentials led to an increase of the cytosolic calcium concentration, hyperpolarization of the vacuolar membrane caused the opposite. Thermodynamic considerations of passive and active calcium transport across the vacuolar membrane suggested that the results described herein reflect the behaviour of vacuolar H+/Ca2+ exchangers whose activity is determined by the proton motive force.
In addition, cytosolic calcium has been shown to be a key regulator of a rapid auxin-induced signaling pathway that regulates polar transport of the hormone.
In the same model system of bulging root hairs it could be shown that the external application of auxin results in a very fast, auxin concentration- and pH-dependent depolarization of the plasma membrane potential. Synchronous with the depolarization of the plasma membrane potential, transient calcium signals were recorded in the cytosol. These were caused by an auxin-activated influx of calcium ions through the ion channel CNGC14. Experiments on loss-of-function mutants as well as pharmacological experiments showed that the auxin-induced activation of the calcium channel requires auxin-perception by the F-box proteins of the TIR1/AFB family.
Investigations of auxin-dependent depolarization as well as the auxin-induced influx of protons into epidermal root cells of loss-of-function mutants showed that the secondary active uptake of auxin by the high-affinity transport protein AUX1 is responsible for the rapid depolarization
Not only the cytosolic calcium signals correlated with CNGC14 function, but also the AUX1-mediated depolarization of root hairs. An unchanged expression of AUX1 in the cngc14 loss-of-function mutant suggested that the activity of AUX1 must be post-translationally regulated. This hypothesis was supported by experiments in which treatment with the calcium channel blocker lanthanum led to inactivation of AUX1 in the wild type.
The cytosolic loading of individual epidermal root cells with auxin resulted in the spread of lateral and acropetal calcium waves. These correlated with a shift of the auxin gradient at the root apex and thus supported a hypothetical calcium-dependent regulation of polar auxin transport. A model for a rapid, auxin-induced and calcium-dependent signaling pathway is presented and its importance for gravitropic root growth is discussed. Since AUX1-mediated depolarization varied with external phosphate concentration, the importance of this rapid signaling pathway is also discussed for the adaptation of root hair growth to an inadequate availability of phosphate.
It is the aim of this thesis to present a visual body weight estimation, which is suitable for medical applications. A typical scenario where the estimation of the body weight is essential, is the emergency treatment of stroke patients: In case of an ischemic stroke, the patient has to receive a body weight adapted drug, to solve a blood clot in a vessel. The accuracy of the estimated weight influences the outcome of the therapy directly. However, the treatment has to start as early as possible after the arrival at a trauma room, to provide sufficient treatment. Weighing a patient takes time, and the patient has to be moved. Furthermore, patients are often not able to communicate a value for their body weight due to their stroke symptoms. Therefore, it is state of the art that physicians guess the body weight. A patient receiving a too low dose has an increased risk that the blood clot does not dissolve and brain tissue is permanently damaged. Today, about one-third gets an insufficient dosage. In contrast to that, an overdose can cause bleedings and further complications. Physicians are aware of this issue, but a reliable alternative is missing.
The thesis presents state-of-the-art principles and devices for the measurement and estimation of body weight in the context of medical applications. While scales are common and available at a hospital, the process of weighing takes too long and can hardly be integrated into the process of stroke treatment. Sensor systems and algorithms are presented in the section for related work and provide an overview of different approaches.
The here presented system -- called Libra3D -- consists of a computer installed in a real trauma room, as well as visual sensors integrated into the ceiling. For the estimation of the body weight, the patient is on a stretcher which is placed in the field of view of the sensors. The three sensors -- two RGB-D and a thermal camera -- are calibrated intrinsically and extrinsically. Also, algorithms for sensor fusion are presented to align the data from all sensors which is the base for a reliable segmentation of the patient.
A combination of state-of-the-art image and point cloud algorithms is used to localize the patient on the stretcher. The challenges in the scenario with the patient on the bed is the dynamic environment, including other people or medical devices in the field of view.
After the successful segmentation, a set of hand-crafted features is extracted from the patient's point cloud. These features rely on geometric and statistical values and provide a robust input to a subsequent machine learning approach. The final estimation is done with a previously trained artificial neural network.
The experiment section offers different configurations of the previously extracted feature vector. Additionally, the here presented approach is compared to state-of-the-art methods; the patient's own assessment, the physician's guess, and an anthropometric estimation. Besides the patient's own estimation, Libra3D outperforms all state-of-the-art estimation methods: 95 percent of all patients are estimated with a relative error of less than 10 percent to ground truth body weight. It takes only a minimal amount of time for the measurement, and the approach can easily be integrated into the treatment of stroke patients, while physicians are not hindered.
Furthermore, the section for experiments demonstrates two additional applications: The extracted features can also be used to estimate the body weight of people standing, or even walking in front of a 3D camera. Also, it is possible to determine or classify the BMI of a subject on a stretcher. A potential application for this approach is the reduction of the radiation dose of patients being exposed to X-rays during a CT examination.
During the time of this thesis, several data sets were recorded. These data sets contain the ground truth body weight, as well as the data from the sensors. They are available for the collaboration in the field of body weight estimation for medical applications.
The field of human-computer interaction (HCI) strives for innovative user interfaces. Innovative and novel user interfaces are a challenge for a growing population of older users and endanger older adults to be excluded from an increasingly digital world. This is because older adults often have lower cognitive abilities and little prior experiences with technology.
This thesis aims at resolving the tension between innovation and age-inclusiveness by developing user interfaces that can be used regardless of cognitive abilities and technology-dependent prior knowledge.
The method of image-schematic metaphors holds promises for innovative and age-inclusive interaction design. Image-schematic metaphors represent a form of technology-independent prior knowledge. They reveal basic mental models and can be gathered in language (e.g. bank account is container from "I put money into my bank account").
Based on a discussion of previous applications of image-schematic metaphors in HCI, the present work derives three empirical research questions regarding image-schematic metaphors for innovative and age-inclusive interaction design.
The first research question addresses the yet untested assumption that younger and older adults overlap in their technology-independent prior knowledge and, therefore, their usage of image-schematic metaphors. In study 1, a total of 41 participants described abstract concepts from the domains of online banking and everyday life. In study 2, ten contextual interviews were conducted. In both studies, younger and older adults showed a substantial overlap of 70% to 75%, indicating that also their mental models overlap substantially.
The second research question addresses the applicability and potential of image-schematic metaphors for innovative design from the perspective of designers. In study 3, 18 student design teams completed an ideation process with either an affinity diagram as the industry standard, image-schematic metaphors or both methods in combination and created paper prototypes. The image-schematic metaphor method alone, but not the combination of both methods, was readily adopted and applied just as a well as the more familiar standard method.
In study 4, professional interaction designers created prototypes either with or without image-schematic metaphors. In both studies, the method of image-schematic metaphors was perceived as applicable and creativity stimulating.
The third research question addresses whether designs that explicitly follow image-schematic metaphors are more innovative and age-inclusive regarding differences in cognitive abilities and prior technological knowledge. In two experimental studies (study 5 and 6) involving a total of 54 younger and 53 older adults, prototypes that were designed with image-schematic metaphors were perceived as more innovative compared to those who were designed without image-schematic metaphors. Moreover, the impact of prior technological knowledge on interaction was reduced for prototypes that had been designed with image-schematic metaphors. However, participants' cognitive abilities and age still influenced the interaction significantly.
The present work provides empirical as well as methodological findings that can help to promote the method of image-schematic metaphors in interaction design. As a result of these studies it can be concluded that the image-schematic metaphors are an applicable and effective method for innovative user interfaces that can be used regardless of prior technological knowledge.
Texts, Animals, Environments. Zoopoetics and Ecopoetics probes the multiple links between ecocriticism and animal studies, assessing the relations between animals, environments and poetics. While ecocriticism usually relies on a relational approach to explore phenomena related to the environment or ecology more broadly, animal studies tends to examine individual or species-specific aspects. As a consequence, ecocriticism concentrates on ecopoetical, animal studies on zoopoetical elements and modes of representation in literature (and the arts more generally). Bringing key concepts of ecocriticism and animal studies into dialogue, the volume explores new ways of thinking about and reading texts, animals, and environments – not as separate entities but as part of the same collective.
Assay and impurity profiling of the pharmaceuticals are the key routine quality control methods employed worldwide for which High Performance Liquid Chromatography (HPLC) is the most widely used technique. The ability to carry out these routine laboratory procedures in low- and middle- income countries (LMICs) need the methods to be based upon simple instruments manageable with moderate levels of personnel skill and costs involved.
Simple, convenient, and cost effective reverse phase HPLC methods were developed using phosphate buffer and methanol as mobile phase with C18 column as stationary phase for the impurity profiling and assay of beta lactam antibiotics. Isocratic elution and UV detection was employed in these methods. Impurity profiling method was developed for coamoxiclav tablets and ceftriaxone bulk drug. The method for ceftriaxone included a supplementary method to quantify one of its known impurity (Impurity D of ceftriaxone). This method involved use of acetonitrile where as the two main methods were achieved on the targeted method design, described above. With the exception of impurity A of ceftriaxone, the methods developed can successfully quantify impurities to the concentration as low as ≤0.05%, which is in accordance with the current guidelines for the impurity profiling of antibiotics issued by European Medicines Agency.
As ensuring cost reduction was one of the key objectives of carrying out the method development exercise, in situ methods for the preparation of impurities were also identified and some new methods were introduced. The stability of beta lactam antibiotics and the choice of solvent were given due attention during the process of method development revealing information on the presence of new impurities. Deacetyl cefotaxime and 2-mercaptobenzathiazole were identified in this process as new impurities of ceftriaxone currently not listed under known impurities by United States Pharmacopoeia and European Pharmacopoeia. However, deacetyl cefotaxime is a known impurity of cefotaxime whereas the latter molecule is a degradation product of one of the synthesis impurities of ceftriaxone. This substance is reported to be carcinogenic and is resolved using the supplementary method developed for ceftriaxone, hence making its detection and quantification possible. A known inactive impurity of ceftriaxone (Impurity A, E-isomer of ceftriaxone) was` also shown to be produced by exposure to day light, thus warranting the light protection of the ceftriaxone solution, an information that is of critical importance in the clinical settings.
A series of experimentation was carried out on the finished products of beta lactam antibiotics sampled from Pakistan and few other countries, to identify key quality issues in the samples. Though the limited sample size and convenient sampling did not provide results that could yield a decisive figure for the country status for prevalence of substandard and falsified medical products, but the experiments have clearly indicated that the problems in drug quality do exist and beta lactam antibiotics form a class of high-risk medicine with respect to surveillance for poor-quality medicines. Isolation of unknown impurities was also carried out along with the introduction of new and modified methods for preparation of impurities of beta-lactam antibiotics.
In addition, detailed literature survey was carried out for understanding the complex problem of the poor-quality medicine, impact of poor quality antimicrobials on health care system and the magnitude of the problem at the global level. The country status of Pakistan regarding quality of medicines was recorded based upon the available documentary evidence. The current technologies and strategic options available for low- and middle-income countries in aiding fight for combating poor quality medicines was also laid down to design recommendations for Pakistan. A comprehensive review of the information technology tools used for identification and control of substandard and falsified medicines was also conducted.
With the introduction of Software-defined Networking (SDN) in the late 2000s, not only a new research field has been created, but a paradigm shift was initiated in the broad field of networking. The programmable network control by SDN is a big step, but also a stumbling block for many of the established network operators and vendors. As with any new technology the question about the maturity and the productionreadiness of it arises. Therefore, this thesis picks specific features of SDN and analyzes its performance, reliability, and availability in scenarios that can be expected in production deployments.
The first SDN topic is the performance impact of application traffic in the data plane on the control plane. Second, reliability and availability concerns of SDN deployments are exemplary analyzed by evaluating the detection performance of a common SDN controller. Thirdly, the performance of P4, a technology that enhances SDN, or better its impact of certain control operations on the processing performance is evaluated.
Human actions are generally not determined by external stimuli, but by internal goals and by the urge to evoke desired effects in the environment. To reach these effects, humans typically have to act. But at times, deciding not to act can be better suited or even the only way to reach a desired effect. What mental processes are involved when people decide not to act to reach certain effects? From the outside it may seem that nothing remarkable is happening, because no action can be observed. However, I present three studies which disclose the cognitive processes that control nonactions.
The present experiments address situations where people intentionally decide to omit certain actions in order to produce a predictable effect in the environment. These experiments are based on the ideomotor hypothesis, which suggests that bidirectional associations can be formed between actions and the resulting effects. Because of these associations, anticipating the effects can in turn activate the respective action. The results of the present experiments show that associations can be formed between nonactions (i.e., the intentional decision not to act) and the resulting effects. Due to these associations, perceiving the nonaction effects encourages not acting (Exp. 1–3). What is more, planning a nonaction seems to come with an activation of the effects that inevitably follow the nonaction (Exp. 4–5). These results suggest that the ideomotor hypothesis can be expanded to nonactions and that nonactions are cognitively represented in terms of their sensory effects. Furthermore, nonaction effects can elicit a sense of agency (Exp. 6–8). That is, even though people refrain from acting, the resulting nonaction effects are perceived as self-produced effects.
In a nutshell, these findings demonstrate that intentional nonactions include specific mechanisms and processes, which are involved, for instance, in effect anticipation and the sense of agency. This means that, while it may seem that nothing remarkable is happening when people decide not to act, complex processes run on the inside, which are also involved in intentional actions.
With the late twentieth-century reform of the labour market in China, jobs ceased to be guaranteed by the government, and higher education became more and more a requirement for even low-level positions. A surplus of academics and a lack of skilled workers are consequences of these developments - yet vocational education, a clear solution to this problem, has had a persistently negative reputation as a second-class education, suitable only for weak students whose results are too low for an academic middle school.
Against this background, Entering Society analyses the social environments, personalities, values and perceptions of vocational education students over three years in Shanghai. The results show how adolescents stigmatized by society view themselves, their education, their identities and their futures.
Two chiral chemical molecules being mirror images of each other, also referred to as enantiomers, may have different pharmacokinetic, pharmacodynamic, and toxicological effects. Thus, pharmaceutical manufacturers and authorities are increasingly interested in the approval of enantiopure drugs. However, the isomeric purity and the limits for isomeric impurities have to be specified applying enantioselective analytical methods, such as capillary electrophoresis.
The separation of enantiomers in capillary electrophoresis may be improved by the addition of ionic liquids to the background electrolyte. The aim of this work was to investigate the influence of different separation conditions on the enantioseparation of phenethylamines in background electrolytes containing ionic liquids based on tetrabutylammonium cations.
Best chiral separations were achieved at acidic pH values using phosphate buffers containing 125 mmol/L tetrabutylammonium based salts. Different reasons explaining enhanced enantioseparations in buffers containing ionic liquids were found. First, due to an improvement of the cyclodextrin solubility, the addition of ionic liquids to the background electrolyte enables the use of higher concentrations of these chiral selector. Furthermore, the adsorption of tetrabutylammonium cations to the negatively charged capillary surface results in a reduction of the electroosmotic flow. Hence, the resulting prolongation of migration times leads to a longer period of time for the separation of temporarily formed diastereomeric analyte cyclodextrin complexes, which yields improved enantioseparation. Additionally, due to a decrease of the adsorption of positively charged phenethylamine analyte molecules to capillary surface silanol groups, the adsorption of ionic liquid cations inhibits peak broadening. A further reason explaining an enhanced enantioseparation by the addition of ionic liquids to the background electrolyte is a competition between tetrabutylammonium cations and analyte enantiomers for the inclusion into cyclodextrin cavities.
Furthermore, the influence of different chiral counterions, combined with tetrabutylammonium cations, on the enantioseparation of phenethylamines was investigated. Solely anions based on the basic proteinogenic amino acids L lysine and L arginine yielded chiral separation results superior to those achieved using achiral tetrabutylammonium chloride as background electrolyte additive. Especially the application of tetrabutylammonium L argininate gave very good enantioseparations of all investigated ephedrine derivatives, which might be explained by the ability of L arginine to affect the formation of complexes between analytes and cyclodextrins.
Besides the investigation of the influence of ionic liquids on the enantioseparation, complexes between phenethylamine enantiomers and β cyclodextrin derivatives were characterized by affinity capillary electrophoresis. The binding constants between analyte enantiomers and cyclodextrins and the electrophoretic mobilities of the temporarily formed complexes were determined and compared to the observed chiral resolution values. While neither the calculated binding constants nor their differences correlated with the quality of the enantioseparation, a strong correlation between the differences of the electrophoretic mobilities of the complexes and the chiral resolution values was found.
Myocardial infarction (MI) is a major cause of health problems and is among the leading deadly ending diseases. Accordingly, regenerating functional myocardial tissue and/or cardiac repair by stem cells is one of the most desired aims worldwide. Indeed, the human heart serves as an ideal target for regenerative intervention, because the capacity of the adult myocardium to restore itself after injury or infarct is limited. Thus, identifying new sources of tissue resident adult stem or progenitor cells with cardiovascular potential would help to establish more sophisticated therapies in order to either prevent cardiac failure or to achieve a functional repair. Ongoing research worldwide in this field is focusing on a) induced pluripotent stem (iPS) cells, b) embryonic stem (ES) cells and c) adult stem cells (e. g. mesenchymal stem cells) as well as cardiac fibroblasts or myofibroblasts. However, thus far, these efforts did not result in therapeutic strategies that were transferable into the clinical management of MI and heart failure. Hence, identifying endogenous and more cardiac-related sources of stem cells capable of differentiating into mature cardiomyocytes would open promising new therapeutic opportunities. The working hypothesis of this thesis is that the vascular wall serves as a niche for cardiogenic stem cells. In recent years, various groups have identified different types of progenitors or mesenchymal stem cell-like cells in the adventitia and sub-endothelial zone of the adult vessel wall, the so called vessel wall-resident stem cells (VW-SCs). Considering the fact that heart muscle tissue contains blood vessels in very high density, the physiological relevance of VW-SCs for the myocardium can as yet only be assumed. The aim of the present work is to study whether a subset of VW-SCs might have the capacity to differentiate into cardiomyocyte-like cells. This assumption was challenged using adult mouse aorta-derived cells cultivated in different media and treated with selected factors. The presented results reveal the generation of spontaneously beating cardiomyocyte-like cells using specific media conditions without any genetic manipulation. The cells reproducibly started beating at culture days 8-10. Further analyses revealed that in contrast to several publications reporting the Sca-1+ cells as cardiac progenitors the Sca-1- fraction of aortic wall-derived VW-SCs reproducibly delivered beating cells in culture. Similar to mature cardiomyocytes the beating cells developed sarcomeric structures indicated by the typical cross striated staining pattern upon immunofluorescence analysis detecting α-sarcomeric actinin (α-SRA) and electron microscopic analysis. These analyses also showed the formation of sarcoplasmic reticulum which serves as calcium store. Correspondingly, the aortic wall-derived beating cardiomyocyte-like cells (Ao-bCMs) exhibited calcium oscillations. This differentiation seems to be dependent on an inflammatory microenvironment since depletion of VW-SC-derived macrophages by treatment with clodronate liposomes in vitro stopped the generation of Ao bCMs. These locally generated F4/80+ macrophages exhibit high levels of VEGF (vascular endothelial growth factor). To a great majority, VW-SCs were found to be positive for VEGFR-2 and blocking this receptor also stopped the generation VW-SC-derived beating cells in vitro. Furthermore, the treatment of aortic wall-derived cells with the ß-receptor agonist isoproterenol or the antagonist propranolol resulted in a significant increase or decrease of beating frequency. Finally, fluorescently labeled aortic wall-derived cells were implanted into the developing chick embryo heart field where they became positive for α-SRA two days after implantation. The current data strongly suggest that VW-SCs resident in the vascular adventitia deliver both progenitors for an inflammatory microenvironment and beating cells. The present study identifies that the Sca-1- rather than Sca-1+ fraction of mouse aortic wall-derived cells harbors VW-SCs differentiating into cardiomyocyte-like cells and reveals an essential role of VW-SCs-derived inflammatory macrophages and VEGF-signaling in this process. Furthermore, this study demonstrates the cardiogenic capacity of aortic VW-SCs in vivo using a chimeric chick embryonic model.
Development and application of computational tools for RNA-Seq based transcriptome annotations
(2019)
In order to understand the regulation of gene expression in organisms, precise genome annotation is essential. In recent years, RNA-Seq has become a potent method for generating and improving genome annotations. However, this Approach is time consuming and often inconsistently performed when done manually. In particular, the discovery of non-coding RNAs benefits strongly from the application of RNA-Seq data but requires significant amounts of expert knowledge and is labor-intensive. As a part of my doctoral study, I developed a modular tool called ANNOgesic that can detect numerous transcribed genomic features, including non-coding RNAs, based on RNA-Seq data in a precise and automatic fashion with a focus on bacterial and achaeal species. The software performs numerous analyses and generates several visualizations. It can generate annotations of high-Resolution that are hard to produce using traditional annotation tools that are based only on genome sequences. ANNOgesic can detect numerous novel genomic Features like UTR-derived small non-coding RNAs for which no other tool has been developed before. ANNOgesic is available under an open source license (ISCL) at https://github.com/Sung-Huan/ANNOgesic.
My doctoral work not only includes the development of ANNOgesic but also its application to annotate the transcriptome of Staphylococcus aureus HG003 - a strain which has been a insightful model in infection biology. Despite its potential as a model, a complete genome sequence and annotations have been lacking for HG003. In order to fill this gap, the annotations of this strain, including sRNAs and their functions, were generated using ANNOgesic by analyzing differential RNA-Seq data from 14 different samples (two media conditions with seven time points), as well as RNA-Seq data generated after transcript fragmentation. ANNOgesic was
also applied to annotate several bacterial and archaeal genomes, and as part of this its high performance was demonstrated. In summary, ANNOgesic is a powerful computational tool for RNA-Seq based annotations and has been successfully applied to several species.
Development of Novel Quinolone Amides Against the African Sleeping Sickness - A Fluorine Walk
(2019)
In recent years the transmission of the Human African Trypanosomiasis could be significantly reduced. The reported cases in 2016 reached a historic low level of 2184 cases and these achievements can be ascribed to intense control and surveillance programmes.118 However, most of the reported cases (>1000 in 2015) occurred in the Democratic Republic of the Congo and thus, need to be treated adequately. In particular, when the parasites have traversed the blood-brain barrier (BBB), treatment proved to be even more difficult. In addition, the number of cases always came in waves due to many reasons, e.g., development of resistances. Thus, it can be expected from experiences of the past that the number of cases will increase again. Hence, novel chemical entities are desperately needed in order to overcome the drawbacks which are associated with the current treatment options.
Our drug discovery approach included an initial drug repurposing strategy combined with a phenotypic screening. S. Niedermeier found novel active compounds derived from commercial fluoroquinolones. The most promising hit compound was further developed by G. Hiltensperger resulting in the lead quinolone amide GHQ168 (IC50 = 0.047 µM).
This doctoral thesis is about new insights into the SAR of the quinolone amides and the enhancement of the lead compound. Special consideration was given to the fluorine atom in the quinolone amides and how certain fluorine substitution patterns influence the antitrypanosomal activity, physicochemical properties and pharmacokinetics (i.e. ‘fluorine walk’). Moreover, the ability of the compound class crossing the BBB should be investigated. This feature is inevitable necessary in order to potentially treat African sleeping sickness stage II.
The Gould-Jacobs protocol was predominantly used for the synthesis of the quinolone core. Since former SAR studies mainly concentrated on the variation in positions 1, 3 and 7, quinolone scaffolds (2a-i) with diverse substitution patterns regarding positions 5, 6, 7 and 8 were synthesised in this thesis. The resulting quinolone amides were evaluated for their antitrypanosomal activity.
Voluminous residues in position C-5 resulted in diminished activities (compounds 13, 16 and 18) and solely small-sized moieties were tolerated. In particular the fluorine atom in position 5 revealed beneficial trypanocidal effects as shown for compounds 6 (IC50 = 0.05 µM), 8 (IC50 = 0.04 µM), and 24 (IC50 = 0.02 µM). Furthermore, having fluorine only in position 5 of the quinolone core could considerably reduce the cytotoxic effects (CC50 >100 µM, SI = >2000 for 6). Hence, the 5-fluoro-substituted quinolone amides were considered superior to GHQ168.
Regarding the C-6 position all other moieties (e.g., H in 9, OCH3 in 10, CF3 in 12) except of a fluorine atom decreased the activity against Trypanosoma brucei brucei. A double fluorination in C-6 and C-8 was not beneficial (IC50 = 0.06 µM for 7) and a single fluorine atom in C-8 even showed a negative effect (IC50 = 0.79 µM for 5).
The logP value is considered a surrogate parameter for lipophlicity and thus, affecting permeability and solubility processes. In particular the fluorine atom influences the lipophilicity due to versatile effects: Lipophilicity is increased by additional fluorine atoms on aromatic rings (7, 23) and reduced by fluorine atoms at an alkyl chain (49), respectively. Additionally, the 5-fluoro-substituted quinolone amides (6, 8, and 24) could prove the contrary effect of decreasing lipophilicity when the aromatic fluorine substituent is in vicinity to a carbonyl group.
For the most promising drug candidates 6, 23, and 24 the respective metabolites and the metabolic turnover were investigated by C. Erk. In comparison to GHQ168 the hydroxylation of the benzylamide was prevented by the para-fluorine atom. Hence, half-life was extended for compound 23 (t1/2 = 6.4 h) and N-desalkylation was the predominant pathway. Moreover, the respective fluorine substitution pattern of the quinolone core affected the metabolism of compound 6. The 5-fluoro-substituted quinolone amide was less prone for biotransformation (t1/2 = 7.2 h) and half-life could even be further prolonged for compound 24 (t1/2 = 7.7 h).
Due to the most appropriate safety profile of compound 6, this particular drug candidate was considered for in vivo study. Its poor solubility made a direct intraperitoneal administration unfeasible. Thus, an amorphous solid dispersion of 6 was generated using the spray-drying method according to the previous protocol. Unfortunately, the required solubility for the predicted in vivo study was not achieved.
Furthermore, the compound class of the quinolone amide was evaluated for its ability for brain penetration. The methanesulfonyl precursor 48 was synthesised and subsequently radiofluorinated in the group of Prof. Dr. Samnick (Department of Nuclear Medicine, University Hospital of Würzburg). The labelled compound [18F]49 was administered to mice, and its distribution throughout the body was analysed using positron emission tomography and autoradiography, respectively. The autoradiography of the murine brains revealed medium to high concentrations of [18F]49. Therefore, the quinolone amides are generally suitable for treating Human African Trypanosomiasis stage II.
A scaffold hopping approach was performed starting from the quinolone amides and concluding with the compound class of pyrazoloquinolin-3-ones. The intramolecular hydrogen bond between the sec. amide and the C-4 carbonyl moiety was replaced by a covalent bond. The two compound classes were comparable regarding the antitrypanosomal activity to some degree (IC50 = 7.9 µM (EK02) vs. 6.37 µM (53a)). However, a final evaluation of 59 was not possible due to poor solubility.
Endogenous clocks regulate physiological as well as behavioral rhythms within all organisms. They are well investigated in D. melanogaster on a molecular as well as anatomical level. The neuronal clock network within the brain represents the center for rhythmic activity control. One neuronal clock subgroup, the pigment dispersing factor (PDF) neurons, stands out for its importance in regulating rhythmic behavior. These neurons express the neuropeptide PDF (pigment dispersing factor). A small neuropil at the medulla’s edge, the accessory medulla (AME), is of special interest, as it has been determined as the main center for clock control. It is not only highly innervated by the PDF neurons but also by terminals of all other clock neuron subgroups. Furthermore, terminals of the photoreceptors provide light information to the AME. Many different types of neurons converge within the AME and afterward spread to their next target. Thereby the AME is supplied with information from a variety of brain regions. Among these neurons are the aminergic ones whose receptors’ are expressed in the PDF neurons. The present study sheds light onto putative synaptic partners and anatomical arrangements within the neuronal clock network, especially within the AME, as such knowledge is a prerequisite to understand circadian behavior. The aminergic neurons’ conspicuous vicinity to the PDF neurons suggests synaptic communication among them. Thus, based on former anatomical studies regarding this issue detailed light microscopic studies have been performed. Double immunolabellings, analyses of the spatial relation of pre- and postsynaptic sites of the individual neuron populations with respect to each other and the identification of putative synaptic partners using GRASP reenforce the hypothesis of synaptic interactions within the AME between dopaminergic/ serotonergic neurons and the PDF neurons. To shed light on the synaptic partners I performed first steps in array tomography, as it allows terrific informative analyses of fluorescent signals on an ultrastructural level. Therefore, I tested different ways of sample preparation in order to achieve and optimize fluorescent signals on 100 nm thin tissue sections and I made overlays with electron microscopic images. Furthermore, I made assumptions about synaptic modulations within the neuronal clock network via glial cells. I detected their cell bodies in close vicinity to the AME and PDFcontaining clock neurons. It has already been shown that glial cells modulate the release of PDF from s-LNvs’ terminals within the dorsal brain. On an anatomical level this modulation appears to exist also within the AME, as synaptic contacts that involve PDF-positive dendritic terminals are embedded into glial fibers. Intriguingly, these postsynaptic PDF fibers are often VIIAbstract part of dyadic or even multiple-contact sites in opposite to prolonged presynaptic active zonesimplicating complex neuronal interactions within the AME. To unravel possible mechanisms of such synaptic arrangements, I tried to localize the ABC transporter White. Its presence within glial cells would indicate a recycling mechanism of transmitted amines which allows their fast re-provision. Taken together, synapses accompanied by glial cells appear to be a common arrangement within the AME to regulate circadian behavior. The complexity of mechanisms that contribute in modulation of circadian information is reflected by the complex diversity of synaptic arrangements that involves obviously several types of neuron populations
This work deals with the development and application of novel quantum Monte Carlo methods to simulate fermion-boson models. Our developments are based on the path-integral formalism, where the bosonic degrees of freedom are integrated out exactly to obtain a retarded fermionic interaction. We give an overview of three methods that can be used to simulate retarded interactions. In particular, we develop a novel quantum Monte Carlo method with global directed-loop updates that solves the autocorrelation problem of previous approaches and scales linearly with system size. We demonstrate its efficiency for the Peierls transition in the Holstein model and discuss extensions to other fermion-boson models as well as spin-boson models. Furthermore, we show how with the help of generating functionals bosonic observables can be recovered directly from the Monte Carlo configurations. This includes estimators for the boson propagator, the fidelity susceptibility, and the specific heat of the Holstein model. The algorithmic developments of this work allow us to study the specific heat of the spinless Holstein model covering its entire parameter range. Its key features are explained from the single-particle spectral functions of electrons and phonons. In the adiabatic limit, the spectral properties are calculated exactly as a function of temperature using a classical Monte Carlo method and compared to results for the Su-Schrieffer-Heeger model.
Telemedicine uses telecommunication and information technology to provide health care services over spatial distances. In the upcoming demographic changes towards an older average population age, especially rural areas suffer from a decreasing doctor to patient ratio as well as a limited amount of available medical specialists in acceptable distance. These areas could benefit the most from telemedicine applications as they are known to improve access to medical services, medical expertise and can also help to mitigate critical or emergency situations. Although the possibilities of telemedicine applications exist in the entire range of healthcare, current systems focus on one specific disease while using dedicated hardware to connect the patient with the supervising telemedicine center.
This thesis describes the development of a telemedical system which follows a new generic design approach. This bridges the gap of existing approaches that only tackle one specific application. The proposed system on the contrary aims at supporting as many diseases and use cases as possible by taking all the stakeholders into account at the same time. To address the usability and acceptance of the system it is designed to use standardized hardware like commercial medical sensors and smartphones for collecting medical data of the patients and transmitting them to the telemedical center. The smartphone can also act as interface to the patient for health questionnaires or feedback.
The system can handle the collection and transport of medical data, analysis and visualization of the data as well as providing a real time communication with video and audio between the users.
On top of the generic telemedical framework the issue of scalability is addressed by integrating a rule-based analysis tool for the medical data. Rules can be easily created by medical personnel via a visual editor and can be personalized for each patient. The rule-based analysis tool is extended by multiple options for visualization of the data, mechanisms to handle complex rules and options for performing actions like raising alarms or sending automated messages.
It is sometimes hard for the medical experts to formulate their knowledge into rules and there may be information in the medical data that is not yet known. This is why a machine learning module was integrated into the system. It uses the incoming medical data of the patients to learn new rules that are then presented to the medical personnel for inspection. This is in line with European legislation where the human still needs to be in charge of such decisions.
Overall, we were able to show the benefit of the generic approach by evaluating it in three completely different medical use cases derived from specific application needs: monitoring of COPD (chronic obstructive pulmonary disease) patients, support of patients performing dialysis at home and councils of intensive-care experts. In addition the system was used for a non-medical use case: monitoring and optimization of industrial machines and robots. In all of the mentioned cases, we were able to prove the robustness of the generic approach with real users of the corresponding domain. This is why we can propose this approach for future development of telemedical systems.
The quest for finding a unifying theory for both quantum theory and gravity lies at the heart of much of the research in high energy physics. Although recent years have witnessed spectacular experimental confirmation of our expectations from Quantum Field Theory and General Relativity, the question of unification remains as a major open problem. In this context, the perturbative aspects of quantum black holes represent arguably the best of our knowledge of how to proceed in this pursue.
In this thesis we investigate certain aspects of quantum gravity in 2 + 1 dimensional anti-de Sitter space (AdS3), and its connection to Conformal field theories in 1 + 1 dimensions (CFT2), via the AdS/CFT correspondence.
We study the thermodynamics properties of higher spin black holes. By focusing on the spin-4 case, we show that black holes carrying higher spin charges display a rich phase diagram in the grand canonical ensemble, including phase transitions of the Hawking-Page type, first order inter-black hole transitions, and a second order critical point.
We investigate recent proposals on the connection between bulk codimension-1 volumes and computational complexity in the CFT. Using Tensor Networks we provide concrete evidence of why these bulk volumes are related to the number of gates in a quantum circuit, and exhibit their topological properties. We provide a novel formula to compute this complexity directly in terms of entanglement entropies, using techniques from Kinematic space.
We then move in a slightly different direction, and study the quantum properties of black holes via de Functional Renormalisation Group prescription coming from Asymptotic safety. We avoid the arbitrary scale setting by restricting to a narrower window in parameter space, where only Newton’s coupling and the cosmological constant are allowed to vary. By one assumption on the properties of Newton’s coupling, we find black hole solutions explicitly. We explore their thermodynamical properties, and discover that very large black holes exhibit very unusual features.
Non-steroidal antiinflammatory drugs are most commonly used for inflammatory and postoperative pain. But they lack effectiveness and specificity, leading to severe side effects, like gastric ulcers, asthma and severe bleeding. Oxidized 1-palmitoyl-2-arachinidonoyl-sn-glycero-3-phosphocholine (OxPAPC) plays an important role in inflammatory pain. PAPC is a common phosphatidylcholine of membranes, which can be oxidized by reactive oxygen species. In preliminary experiments, our group found that local injection of OxPAPC in rat paws induces hyperalgesia.
In this study we examined the effect of OxPAPC on transient receptor potential A1 (TRPA1), an ion channel expressed in C-fiber neurons. Furthermore, we investigated if intracellular cysteine residues of TRPA1 were necessary for agonist-channel-interactions and if a subsequent TRPA1 activation could be prevented by OxPAPC scavengers.
To answer these questions, we performed calcium imaging using HEK-293 cells stably expressing hTRPA1, or transiently expressing the triple mutant channel hTRPA1-3C and naïve DRG neurons. Cells were incubated with the ratiometric, fluorescent dye Fura-2/AM and stimulated with OxPAPC. The change of light emission after excitation with 340 and 380 nm wavelengths allowed conclusions regarding changes of intracellular calcium concentrations after TRPA1 activation.
In our investigation we proved evidence that OxPAPC activates TRPA1, which caused a flow of calcium ions into the cytoplasm. The TRPA1-specific channel blocker HC-030031 eliminated this agonist-induced response. TRPA1-3C was not completely sensitive to OxPAPC. The peptide D-4F and the monoclonal antibody E06 neutralized OxPAPC-induced TRPA1 activation.
In this work, the importance of OxPAPC as a key mediator of inflammatory pain and as a promising target for drug design is highlighted. Our results indicate that TRPA1 activation by OxPAPC involves cysteine-dependent mechanisms, but there are other, cysteine-independent activation mechanisms as well. Potential pharmaceuticals for the treatment of inflammatory pain are D-4F and E06, whose efficiency has recently been confirmed in the animal model by our research group.
Staphylococcus aureus asymptomatically colonizes the skin and anterior nares of 20-30% of the healthy human population. As an opportunistic human pathogen it elicits a variety of infections ranging from skin and soft tissue infections to highly severe manifestations such as pneumonia, endocarditis and osteomyelitis. Due to the emergence of multi resistant strains, treatment of staphylococcal infections becomes more and more challenging and the WHO therefore classified S. aureus as a “superbug”. The variety of diseases triggered by S. aureus is the result of a versatile expression of a large set of virulence factors. The most prominent virulence factor is the cytotoxic and haemolytic pore-forming α-toxin whose expression is mediated by a complex regulatory network involving two-component systems such as the agr quorum-sensing system, accessory transcriptional regulators and alternative sigma-factors. However, the intricate regulatory network is not yet understood in its entirety. Recently, a transposon mutation screen identified the AraC-family transcriptional regulator ‘Repressor of surface proteins’ (Rsp) to regulate haemolysis, cytotoxicity and the expression of various virulence associated factors. Deletion of rsp was accompanied by a complete loss of transcription of a 1232 nt long non-coding RNA, SSR42.
This doctoral thesis focuses on the molecular and functional characterization of SSR42. By analysing the transcriptome and proteome of mutants in either SSR42 or both SSR42 and rsp, as well as by complementation of SSR42 in trans, the ncRNA was identified as the main effector of Rsp-mediated virulence. Mutants in SSR42 exhibited strong effects on transcriptional and translational level when compared to wild-type bacteria. These changes resulted in phenotypic alterations such as strongly reduced haemolytic activity and cytotoxicity towards epithelial cells as well as reduced virulence in a murine infection model. Deletion of SSR42 further promoted the formation of small colony variants (SCV) during long term infection of endothelial cells and demonstrated the importance of this molecule for intracellular bacteria. The impact of this ncRNA on staphylococcal haemolysis was revealed to be executed by modulation of sae mRNA stability and by applying mutational studies functional domains within SSR42 were identified.
Moreover, various stressors modulated the transcription of SSR42 and antibiotic challenge resulted in SSR42-dependently increased haemolysis and cytotoxicity. Transcription of SSR42 itself was found under control of various important global regulators including AgrA, SaeS, CodY and σB, thereby illustrating a central position in S. aureus virulence gene regulation.
The present study thus demonstrates SSR42 as a global virulence regulatory RNA which is important for haemolysis, disease progression and adaption of S. aureus to intracellular conditions via formation of SCVs.
Chronic Kidney Disease as an Important Co-morbid Condition in Coronary Heart Disease Patients
(2019)
In patients with coronary heart disease (CHD) the control of the modifiable “traditional” cardiovascular risk factors such as hypertension, dyslipidemia, diabetes, achieving/maintaining normal body weight and smoking cessation is of major importance to improve prognosis. Guideline recommendations for secondary CHD prevention include specific treatment targets for blood pressure, lipid levels, and markers of glucose metabolism for both younger and older patients. Chronic kidney disease (CKD) has been identified as a “non-traditional” risk factor for worse outcome in CHD patients, as it is associated with a markedly increased risk for subsequent CV events and mortality.
The specific objectives of the current thesis-project are to investigate (a) the quality of care in a recent sample of German CHD patients and to investigate variation of risk factor control between younger and elder patients (≤70 versus >70 years), (b) to analyze the prevalence of CKD across Europe in stable CHD patients in the outpatient setting and during a hospital stay for CHD, (c) to investigate the level of awareness of CKD in German CHD patients and their treating physicians.
Data from the European-wide EUROASPIRE IV study were used that include data on 7998 CHD patients in the ambulatory setting (study visit) and during a hospital stay for CHD (index). The German EUROASPIRE IV study center in Würzburg recruited 536 patients in 2012-2013. Risk factor control was compared against the current recommendations of the European Society of Cardiology. CKD was described by stages of glomerular filtration rate (eGFR) and albuminuria. German patients were asked in an additional kidney specific module whether they have ever been told by a physician about renal impairment. The fact that CKD or acute kidney injury (AKI) was mentioned in prominent parts of the hospital discharge letter as well as correct ICD-coding of CKD or AKI served as a proxy for physician’s awareness of CKD.
The majority of German CHD patients was treated with the recommended drug therapies including e.g. β-blockers, anti-platelets and statins. However, treatment targets for blood pressure and LDL-cholesterol levels were not achieved in many patients (45% and 53%, respectively) and glycemic control in diabetic CHD patients with HbA1-levels <7% was insufficient (61%). A minority of patients reported on current smoking (10%), but unhealthy life-styles e.g. overweight/obesity (85%/37%) were frequent. Patterns of care differed between younger and older CHD patients while older patients were less likely to receive the recommended medical CHD-therapy, were more likely to have uncontrolled blood pressure and also to be diabetic. However, a greater proportion of diabetic patients >70 years was achieving the HbA1c target, and less elder patients were current smokers or were obese. About 17% of patients on average had CKD (eGFR< 60 ml/min/1.73m²) in the entire European sample at the study visit, and an additional 10% had albuminuria despite preserved eGFR, with considerable variation among countries. Impaired kidney function was observed in every fifth patient admitted for CHD in the entire European dataset of the EUROASPIRE IV study. Of the German CHD patients with CKD at the study visit, only a third were aware of their renal impairment. A minority of these patients was being seen by nephrologists, however, with a higher likelihood of CKD awareness and specialist care in more advanced stages of CKD. About a third of patients admitted for CHD showed either CKD or AKI during the hospital stay, but the discharge letter mentioned chronic or acute kidney disease only in every fifth of these patients. In contrast, correct ICD coding of CKD or AKI was more complete, but still suboptimal.
In summary, quality of secondary prevention in German CHD patients indicates considerably room for improvement, with life-style modifications may become an even greater factor in prevention campaigns than medical treatment into certain target ranges. Preventive therapies should also consider different needs in older individuals acknowledging physical and mental potential, other comorbidities and drug-interactions with co-medication. CKD is common in CHD patients, not only in the elderly. Since CHD and CKD affect each other and impact on worse prognosis of each other, raising the awareness of CKD among patients and physicians and considering CKD in medical therapy may improve prognosis and slow disease progression of CHD as well as CKD.
The current treatment strategies for diseases are assessed on the basis of diagnosed phenotypic changes due to an accumulation of asymptomatic events in physiological processes. Since a diagnosis can only be established at advanced stages of the disease, mainly due to insufficient early detection possibilities of physiological disorders, doctors are forced to treat diseases rather than prevent them. Therefore, it is desirable to link future therapeutic interventions to the early detection of physiological changes. So-called sensor-effector systems are designed to recognise disease-specific biomarkers and coordinate the production and delivery of therapeutic factors in an autonomous and automated manner. Such approaches and their development are being researched and promoted by the discipline of synthetic biology, among others.
Against this background, this paper focuses on the in vitro design of cytokine-neutralizing sensor-effector cells designed for the potential treatment of recurrent autoimmune diseases, especially rheumatoid arthritis.
The precise control of inducible gene expression was successfully generated in human cells. At first, a NF-κB-dependent promoter was developed, based on HIV-1 derived DNA-binding motives. The activation of this triggerable promoter was investigated using several inducers including the physiologically important NF-κB inducers tumor necrosis factor alpha (TNFα) and interleukin 1 beta (IL-1β). The activation strength of the NF-κB-triggered promoter was doubled by integrating a non-coding RNA. The latter combined expressed RNA structures, which mimic DNA by double stranded RNAs and have been demonstrated to bind to p50 or p65 by previous publications. The sensitivity was investigated for TNFα and IL-1β. The detection limit and the EC50 values were in in the lower picomolar range. Besides the sensitivity, the reversibility and dynamic of the inducible system were characterized. Hereby a close correlation between pulse times and expression profile was shown.
The optimized NF-κB-dependent promoter was then coupled to established TNFα- and IL-1-blocking biologicals to develop sensor-effector systems with anti-inflammatory activity, and thus potential use against autoimmune diseases such as rheumatoid arthritis. The biologicals were differentiated between ligand-blocking and receptor-blocking biologicals and different variants were selected: Adalimumab, etanercept and anakinra. The non-coding RNA improved again the activation strength of NF-κB-dependent expressed biologicals, indicating its universal benefit. Furthermore, it was shown that the TNFα-induced expression of NF-κB-regulated TNFα-blocking biologics led to an extracellular negative feedback loop. Interestingly, the integration of the non-coding RNA and this negative feedback loop has increased the dynamics and reversibility of the NF-κB-regulated gene expression. The controllability of drug release can also be extended by the use of inhibitors of classical NF-κB signalling such as TPCA-1. The efficacy of the expressed biologicals was detected through neutralization of the cytokines using different experiments. For future in vivo trials, first alginate encapsulations of the cells were performed. Furthermore, the activation of NF-κB-dependent promoter was demonstrated using co-cultures with human plasma samples or using synovial liquids.
With this generated sensor-effector system we have developed self-adjusting cytokine neutralizer cells as a closed-loop delivery system for anit-inflammatory biologics.
Insulin-like growth factor-I (IGF-I) is a 70-amino acid polypeptide with a molecular weight of approximately 7.6 kDa acting as an anabolic effector. It is essential for tissue growth and remodeling. Clinically, it is used for the treatment of growth disorders and has been proposed for various other applications including musculoskeletal diseases. Unlike insulin, IGF-I is complexed to at least six high-affinity binding proteins (IGFBPs) exerting homeostatic effects by modulating IGF-I availability to its receptor (IGF-IR) on most cells in the body as well as changing the distribution of the growth factor within the organism.1-3 Short half-lived IGF-I have been the driving forces for the design of localized IGF-I depot systems or protein modification with enhanced pharmacokinetic properties. In this thesis, we endeavor to present a versatile biologic into which galenical properties were engineered through chemical synthesis, e.g., by site-specific coupling of biomaterials or complex composites to IGF-I. For that, we redesigned the therapeutic via genetic codon expansion resulting in an alkyne introduced IGF-I, thereby becoming a substrate for biorthogonal click chemistries yielding a site-specific decoration.
In this approach, an orthogonal pyrrolysine tRNA synthetase (PylRS)/tRNAPyl CUA pair was employed to direct the co-translational incorporation of an unnatural amino acid—¬propargyl-L-lysine (plk)—bearing a clickable alkyne functional handle into IGF-I in response to the amber stop codon (UAG) introduced into the defined position in the gene of interest. We summarized the systematic optimization of upstream and downstream process alike with the ultimate goal to increase the yield of plk modified IGF-I therapeutic, from the construction of gene fusions resulting in (i) Trx-plk-IGF-I fusion variants, (ii) naturally occurring pro-IGF-I protein (IGF-I + Ea peptide) (plk-IGF-I Ea), over the subsequent bacterial cultivation and protein extraction to the final chromatographic purification. The opportunities and hurdles of all of the above strategies were discussed. Evidence was provided that the wild-type IGF-I yields were pure by exploiting the advantages of the pHisTrx expression vector system in concert with a thrombin enzyme with its highly specific proteolytic digestion site and multiple-chromatography steps. The alkyne functionality was successfully introduced into IGF-I by amber codon suppression. The proper folding of plk-IGF-I Ea was assessed by WST-1 proliferation assay and the detection of phosphorylated AKT in MG-63 cell lysate. The purity of plk-IGF-I Ea was monitored with RP-HPLC and SDS-PAGE analysis. This work also showed site-specific coupling an alkyne in plk-IGF-I Ea by copper (I)-catalyzed azide-alkyne cycloaddition (CuAAC) with potent activities in vitro. The site-specific immobilization of plk-IGF-I Ea to the model carrier (i.e., agarose beads) resulted in enhanced cell proliferation and adhesion surrounding the IGF-I-presenting particles. Cell proliferation and differentiation were enhanced in the accessibility of IGF-I decorated beads, reflecting the multivalence on cellular performance.
Next, we aimed at effectively showing the disease environment by co-delivery of fibroblast growth factor 2 (FGF2) and IGF-I, deploying localized matrix metalloproteinases (MMPs) upregulation as a surrogate marker driving the response of the drug delivery system. For this purpose, we genetically engineered FGF2 variant containing an (S)-2-amino-6-(((2-azidoethoxy)carbonyl)amino)hexanoic acid incorporated at its N-terminus, followed by an MMPs-cleavable linker (PCL) and FGF2 sequence, thereby allowing site-directed, specific decoration of the resultant azide-PCL-FGF2 with the previously mentioned plk-IGF-I Ea to generate defined protein-protein conjugates with a PCL in between. The click reaction between plk-IGF-I Ea and azide-PCL-FGF2 was systematically optimized to increase the yield of IGF-FGF conjugates, including reaction temperature, incubation duration, the addition of anionic detergent, and different ratios of the participating biopharmaceutics. The challenge here was that CuAAC reaction components or conditions might oxidize free cysteines of azide-PCL-FGF2 and future work needs to present the extent of activity retention after conjugation. Furthermore, our study provides potential options for dual-labeling of IGF-I either by the introduction of unnatural amino acids within two distinct positions of the protein of interest for parallel “double-click” labeling of the resultant plk-IGF-I Ea-plk or by using a combination of enzymatic-catalyzed and CuAAC bioorthogonal coupling strategies for sequentially dual-labeling of plk-IGF-I Ea.
In conclusion, genetic code expansion in combination with click-chemistry provides the fundament for novel IGF-I analogs allowing unprecedented site specificity for decoration. Considerable progress towards IGF-I based therapies with enhanced pharmacological properties was made by demonstrating the feasibility of the expression of plk incorporated IGF-I using E. coli and retained activity of unconjugated and conjugated IGF-I variant. Dual-labeling of IGF-I provides further insights into the functional requirements of IGF-I. Still, further investigation warrants to develop precise IGF-I therapy through unmatched temporal and spatial regulation of the pleiotropic IGF-I.
Ovarian cancer is one of the most common gynecological malignancies in the world. The prevalence of a microbial signature in ovarian cancer has been reported by several studies till date. In these microorganisms, Human herpesvirus 6 (HHV-6) and Chlamydia trachomatis (C.tr) are especially important as they have significantly high prevalence rate. Moreover, these pathogens are directly involved in causing DNA damage and thereby disrupting the integrity of host genome which is the underlying cause of any cancer. This study focuses on how the two pathogens, HHV-6 and C. trachomatis can affect the genome integrity in their individual capacities and thereby may drive ovarian epithelial cells towards transformation. HHV-6 has unique tendency to integrate its genome into the host genome at subtelomeric regions and achieve a state of latency. This latent virus may get reactivated during the course of life by stress, drugs such as steroids, during transplantation, pregnancy etc. The study presented here began with an interesting observation wherein the direct repeat (DR) sequences flanking the ends of double stranded viral genome were found in unusually high numbers in human blood samples as opposed to normal ratio of two DR copies per viral genome. This study was corroborated with in vitro data where cell lines were generated to mimic the HHV-6 status in human samples. The same observation of unusually high DR copies was found in these cell lines as well. Interestingly, fluorescence in situ hybridization (FISH) and inverse polymerase chain reaction followed by southern blotting showed that DR sequences were found to be integrated in nontelomeric regions as opposed to the usual sub-telomeric integration sites in both human samples and in cell lines. Sanger sequencing confirmed the non-telomeric integration of viral DR sequences in the host genome. Several studies have shown that C. trachomatis causes DNA damage and inhibits the signaling cascade of DNA damage response. However, the effect of C. trachomatis infection on process of DNA repair itself was not addressed. In this study, the effect of C. trachomatis infection on host base excision repair (BER) has been addressed. Base excision repair is a pathway which is responsible for replacing the oxidized bases with new undamaged ones. Interestingly, it was found that C. trachomatis infection downregulated polymerase β expression and attenuated polymerase β- mediated BER in vitro. The mechanism of the polymerase β downregulation was found to be associated with the changes in the host microRNAs and downregulation of tumor suppressor, p53. MicroRNA-499 which has a binding site in the polymerase β 3’UTR was shown to be upregulated during C. trachomatis infection. Inhibition of miR-499 using synthetic miR-499 inhibitor indeed improved the repair efficiency during C. trachomatis infection in the in vitro repair assay. Moreover, p53 transcriptionally regulates polymerase β and stabilizing p53 during C. trachomatis infection enhanced the repair efficiency. Previous studies have shown that C. trachomatis can reactivate latent HHV-6. Therefore, genomic instability due to insertions of unstable ‘transposon-like’ HHV-6 DR followed by compromised BER during C. trachomatis infection cumulatively support the hypothesis of pathogenic infections as a probable cause of ovarian cancer
Statistical Procedures for modelling a random phenomenon heavily depend on the choice of a certain family of probability distributions. Frequently, this choice is governed by a good mathematical feasibility, but disregards that some distribution properties may contradict reality. At most, the choosen distribution may be considered as an approximation. The present thesis starts with a construction of distributions, which uses solely available information and yields distributions having greatest uncertainty in the sense of the maximum entropy principle. One of such distributions is the monotonic distribution, which is solely determined by its support and the mean. Although classical frequentist statistics provides estimation procedures which may incorporate prior information, such procedures are rarely considered. A general frequentist scheme for the construction of shortest confidence intervals for distribution parameters under prior information is presented. In particular, the scheme is used for establishing confidence intervals for the mean of the monotonic distribution and compared to classical procedures. Additionally, an approximative procedure for the upper bound of the support of the monotonic distribution is proposed. A core purpose of auditing sampling is the determination of confidence intervals for the mean of zero-inflated populations. The monotonic distribution is used for modelling such a population and is utilised for the procedure of a confidence interval under prior information for the mean. The results are compared to two-sided intervals of Stringer-type.
All living organisms need timekeeping mechanisms to track and anticipate cyclic changes in their environment. The ability to prepare for and respond to daily and seasonal changes is endowed by circadian clocks. The systemic features and molecular mechanisms that drive circadian rhythmicity are highly conserved across kingdoms. Therefore, Drosophila melanogaster with its relatively small brain (ca. 135.000 neurons) and the outstanding genetic tools that are available, is a perfect model to investigate the properties and relevance of the circadian system in a complex, but yet comprehensible organism.
The last 50 years of chronobiological research in the fruit fly resulted in a deep understanding of the molecular machinery that drives circadian rhythmicity, and various histological studies revealed the neural substrate of the circadian system. However, a detailed neuroanatomical and physiological description on the single-cell level has still to be acquired. Thus, I employed a multicolor labeling approach to characterize the clock network of Drosophila melanogaster with single-cell resolution and additionally investigated the putative in- and output sites of selected neurons.
To further study the functional hierarchy within the clock network and to monitor the “ticking clock“ over the course of several circadian cycles, I established a method, which allows us to follow the accumulation and degradation of the core clock genes in living brain explants by the means of bioluminescence imaging of single-cells.
Errors in Prospective Memory
(2019)
Prospective memory is the ability to implement intentions at a later point in time in response to a specified cue. Such prospective memory tasks often occur in daily living and workplace situations. However, in contrast to retrospective memory there has been relatively little research on prospective memory. The studies by Harris (1984) and Einstein and MacDaniel (1990) served as a starting point for a now steadily growing area of research. Based on this emerging field of study this dissertation presents and connects and five journal articles, which further explore prospective memory by focusing on its potential errors.
The first article addresses the question if additional cognitive resources are needed after a prospective memory cue occurs to keep the intention active until it is implemented. The theory by Einstein, McDaniel, Williford, Pagan and Dismukes (2003), which suggested this active maintenance, could not be replicated. The second article demonstrated that interruptions between cue and the window of opportunity to implement the intention reduce prospective memory performance, especially if the interruption is tied with a change of context. Article three to five were focused on the erroneous implementation of a no longer active prospective memory task, so called commission errors. The suggested mechanism for their occurrence, the dual-mechanism account (Bugg, Scullin, & Rauvola, 2016), was not suited to explain the present results. A modification for the dual-mechanism account was formulated, which can account for prior work, as well as for the present data.
The results of all five articles also indicate that the moment of cue retrieval is even more relevant for prospective memory and its errors than previously accounted for.
Biofabrication is an advancing new research field that might, one day, lead to complex products like tissue replacements or tissue analogues for drug testing. Although great progress was made during the last years, there are still major hurdles like new types of materials and advanced processing techniques. The main focus of this thesis was to help overcoming this hurdles by challenging and improving existing fabrication processes like extrusion-based bioprinting but also by developing new techniques. Furthermore, this thesis assisted in designing and processing materials from novel building blocks like recombinant spider silk proteins or inks loaded with charged nanoparticles.
A novel 3D printing technique called Melt Electrospinning Writing (MEW) was used in Chapter 3 to create tubular constructs from thin polymer fibers (roughly 12 μm in diameter) by collecting the fibers onto rotating and translating cylinders. The main focus was put on the influence of the collector diameter and its rotation and translation on the morphology of the constructs generated by this approach. In a first step, the collector was not moving and the pattern generated by these settings was analyzed. It could be shown that the diameter of the stationary collectors had a big impact on the morphology of the constructs. The bigger the diameter of the mandrel (smallest collector diameters 0.5 mm, biggest 4.8 mm) got, the more the shape of the generated footprint converged into a circular one known from flat collectors. In a second set of experiments the mandrels were only rotated. Increasing the rotational velocity from 4.2 to 42.0 rpm transformed the morphology of the constructs from a figure-of-eight pattern to a sinusoidal and ultimately to a straight fiber morphology. It was possible to prove that the transformation of the pattern was comparable to what was known from increasing the speed using flat collectors and that at a critical speed, the so called critical translation speed, straight fibers would appear that were precisely stacking on top of each other. By combining rotation and translation of the mandrel, it was possible to print tubular constructs with defined winding angles. Using collections speeds close to the critical translation speed enabled higher control of fiber positioning and it was possible to generate precisely stacked constructs with winding angles between 5 and 60°.
In Chapter 4 a different approach was followed. It was based on extrusion-based bioprinting in combination with a hydrogel ink system. The ink was loaded with nanoparticles and the nanoparticle release was analyzed. In other words, two systems, a printable polyglycidol/hyaluronic acid ink and mesoporous silica nanoparticles (MSN), were combined to analyze charge driven release mechanism that could be fine-tuned using bioprinting. Thorough rheological evaluations proved that the charged nanoparticles, both negatively charged MSN-COOH and positively charged MSN-NH2, did not alter the shear thinning properties of the ink that revealed a negative base charge due to hyaluronic acid as one of its main components. Furthermore, it could be shown that the particles did also not have a negative effect on the recovery properties of the material after exposure to high shear. During printing, the observations made via rheological testing were supported by the fact that all materials could be printed at the same settings of the bioprinter. Using theses inks, it was possible to make constructs as big as 12x12x3 mm3 composed of 16 layers. The fiber diameters produced were about 627±31 μm and two-component constructs could be realized utilizing the two hydrogel print heads of the printer to fabricate one hybrid construct. The particle distribution within those constructs was homogeneous, both from a microscopic and a macroscopic point of view. Particle release from printed constructs was tracked over 6 weeks and revealed that the print geometry had an influence on the particle release. Printed in a geometry with direct contact between the strands containing different MSN, the positively charged particles quickly migrated into the strand previously containing only negatively charged MSN-COOH. The MSN-COOH seemed to be rather released into the surrounding liquid and also after 6 weeks no MSN-COOH signal could be detected in the strand previously only containing MSN-NH2. In case of a geometry without direct contact between the strands, the migration of the positively charged nanoparticles into the MSN-COOH containing strand was strongly delayed. This proved that the architecture of the printed construct can be used to fine-tune the particle release from nanoparticle containing printable hydrogel ink systems.
Chapter 5 discusses an approach using hydrogel inks based on recombinant spider silk proteins processed via extrusion-based bioprinting. The ink could be applied for printing at protein concentrations of 3 % w/v without the addition of thickeners or any post process crosslinking. Both, the recombinant protein eADF4(C16) and a modification introducing a RGD-sequence to the protein (eADF4(C16)-RGD), could be printed revealing a very good print fidelity. The RGD modification had positive effect on the adhesion of cells seeded onto printed constructs. Furthermore, human fibroblasts encapsulated in the ink at concentrations of 1.2 million cells per mL did not alter the print fidelity and did not interfere with the crosslinking mechanism of the ink. This enabled printing cell laden constructs with a cell survival rate of 70.1±7.6 %. Although the cell survival rate needs to be improved in further trials, the approach shown is one of the first leading towards the shift of the window of biofabrication because it is based on a new material that does not need potentially harmful post-process crosslinking and allows the direct encapsulation of cells staying viable throughout the print process.
Calcium phosphate cements (CPC) represent valuable synthetic bone grafts, as they are self-setting, biocompatible, osteoconductive and in their composition similar to the inorganic phase of human bone. Due to their long shelf-life, neutral setting and since water is sufficient for setting, hydroxyapatite (HA) forming cements are processed in different paste formulations. Those comprise dual setting, Ca2+ binding and premixed cement systems. With dual setting formulations, both dissolution and precipitation of the cement raw powder occur simultaneously to the polymerization of water-soluble monomers to form a hydrogel. Chelating agents are able to form complexes with Ca2+ released from the raw powder. Premixed systems mostly contain the raw powder of the cement and a non-aqueous binder liquid which delays the setting reaction until application in the moist physiological environment. In the present work, two of those reaction mechanisms allowed the development of HA based cement applications.
Drillable cements are of high clinical interest, as the quality of screw and plate osteosynthesis techniques can be improved by cement augmentation. A drillable, dual setting composite from HA and a poly(2-hydroxyethyl methacrylate) hydrogel was analyzed with respect to the influence of monomer content and powder-to-liquid ratio on setting kinetics and mechanical outcome. While the conversion to HA and crystal growth were constantly confined with increased monomer amount, a minimum concentration of 50 % was required to see impressive ameliorations including a low bending modulus and high fracture energy at improved bending strength. Increasing the liquid amount enabled injection of the paste as well as drilling after 10 min of pre-setting.
While classic bone wax formulations have drawbacks such as infection, inflammation, hindered osteogenesis and a lack of biodegradability, the as-presented premixed formulation is believed to exhibit outmatching properties. It consisted of HA raw powders and a non-aqueous, but water-miscible carrier liquid from poly(ethylene glycol) (PEG). The bone wax was proved to be cohesive and malleable, it withstood blood pressure conditions and among deposition in an aqueous environment, PEG was exchanged such that porous, nanocrystalline HA was formed. Incorporation of a model antibiotic proved the suitability of the novel bone wax formulation for drug release purposes.
Prefabricated laminates from premixed carbonated apatite forming cement and poly(ε-caprolactone) fiber mats with defined pore architecture were presented as a potential approach for the treatment of 2-dimensional, curved cranial defects. They are flexible until application and were produced in a layer-by-layer approach from both components such that the polymer scaffold prevents the cement from flowing. It was demonstrated that solution electrospinning with a patterned collector for the fabrication of perforated fiber mats was suitable, as high fiber volume contents in combination with an appropriate interface enabled the successful fabrication of mechanically reinforced laminates. Mild immersion of the scaffolds under alkaline conditions additionally improved the interphase followed by an increase in bending-strength.
Since few years, magnesium phosphate cements (MPC) have attracted increasing attention for bone replacement. Compared to CPC, MPC exhibit a higher degradation potential and high early strength and they release biologically valuable Mg2+. However, common systems offer some challenges while using them in non-classic cement formulations such as the need for foreign ion supply, the potential acidity of the reaction or the fast setting kinetics. Here, it was possible to develop a chelate-setting MPC paste with a broad spectrum of potential applications.
The general mechanism of the novel setting principle was tested in a proof-of-principle manner. The cement paste consisted of farringtonite with differently concentrated phytic acid solution for chelate formation with Mg2+ from the raw powder. Adjusting the phytic acid content and adding a magnesium oxide as setting regulator to compensate its retarding effect resulted in drillable formulations. Additionally, there is a strong clinical demand for well working bone adhesives especially in a moist environment. Mostly the existing formulations are non-biodegradable. Ex vivo adhesion of the above presented MPC under wet conditions on bone demonstrated over a course of 7 d shear strengths of 0.8 MPa. Further, the hardened cement specimens showed a mass loss of 2 wt.% within 24 d in an aqueous environment and released about 0.17 mg/g of osteogenic Mg2+ per day. Together with the demonstrated cytocompatibility towards human fetal osteoblasts, this cement system showed promising characteristics in terms of degradable biocements with special application purposes.
Despite its history of more than one hundred years, the phenomenon of
superconductivity has not lost any of its allure. During that time the concept
and perception of the superconducting state - both from an experimental and
theoretical point of view - has evolved in way that has
triggered increasing interest. What was initially believed to simply be the
disappearance of electrical resistivity, turned out to be a universal and
inevitable result of quantum statistics, characterized by many more
aspects apart from its zero resistivity. The insights of
BCS-theory eventually helped to uncover its deep connection to particle physics
and consequently led to the formulation of the Anderson-Higgs-mechanism. The
very core of this theory is the concept of gauge symmetry (breaking). Within the
framework of condensed-matter theory, gauge invariance is only one of several
symmetry groups which are crucial for the description and classification of
superconducting states. \\
In this thesis, we employ time-reversal, inversion, point group and spin
symmetries to investigate and derive possible Hamiltonians featuring spin-orbit
interaction in two and three spatial dimensions.
In particular, this thesis aims at a generalization of existing numerical
concepts to open up the path to spin-orbit coupled (non)centrosymmetric
superconductors in multi-orbital models.
This is done in a two-fold way: On the one hand, we formulate - based on the
Kohn-Luttinger effect - the perturbative renormalization group in the
weak-coupling limit. On the other hand, we define the spinful flow equations of
the effective action in the framework of functional renormalization, which is
valid for finite interaction strength as well. Both perturbative and functional
renormalization groups produce a low-energy effective (spinful) theory that
eventually gives rise to a particular superconducting state, which is investigated
on the level of the irreducible two-particle vertex. The symbiotic relationship
between both perturbative and functional renormalization can be traced back to
the fact that, while the perturbative renormalization at infinitesimal coupling
is only capable of dealing with the Cooper instability, the functional
renormalization can investigate a plethora of instabilities both in the
particle-particle and particle-hole channels. \\
Time-reversal and inversion are the two key symmetries, which are being used to
discriminate between two scenarios. If both time-reversal and inversion symmetry
are present, the Fermi surface will be two-fold degenerate and characterized by a
pseudospin degree of freedom. In contrast, if inversion symmetry is broken, the
Fermi surface will be spin-split and labeled by helicity. In both cases, we
construct the symmetry allowed states in the particle-particle as well as the
particle-hole channel. The methods presented are formally unified and implemented
in a modern object-oriented reusable and extendable C++ code.
This methodological implementation is employed to one member of both families of
pseudospin and helicity characterized systems. For the pseudospin case, we choose
the intriguing matter of strontium ruthenate, which has been heavily
investigated for already twenty-four years, but still keeps puzzling researchers.
Finally, as the helicity based application, we consider the oxide heterostructure
LaAlO$_{3}$/SrTiO$_{3}$, which became famous for its highly mobile two-
dimensional electron gas and is suspected to host topological superconductivity.
An efficient foraging strategy is one of the most important traits for the fitness of animals. The theory of optimal foraging tries to predict foraging behaviour through the overarching question: how animals should forage so as to minimize costs while maximizing profits? Social insects, having occupied nearly every natural niche through widely different strategies, offer themselves as an ideal group to study how well optimal foraging theory can explain their behaviour and success.
Specialization often leads to unique adaptations in morphology and behaviour. I therefore decided to investigate the behaviour of Megaponera analis. This ponerine ant species is specialized on hunting only termites of the subfamily Macrotermitinae at their foraging sites. Their foraging behaviour is regulated by a handful of individual scouts (10-20) that search for termite foraging sites before returning to the nest to recruit a large number of nestmates (200-500 ants). These ants then follow the scout in a column formation to the termites and after the hunt return together to the nest, these raids occur two to five times per day.
Predators of highly defensive prey likely develop cost reducing adaptations. The evolutionary arms race between termites and ants led to various defensive mechanisms in termites, e.g. a caste specialized in fighting predators. As M. analis incurs high injury/mortality risks when preying on termites, some risk mitigating adaptations have evolved. I show that a unique rescue behaviour in M. analis, consisting of injured nestmates being carried back to the nest, reduces combat mortality. These injured ants “call for help” with pheromones present in their mandibular gland reservoirs. A model accounting for this rescue behaviour identifies the drivers favouring its evolution and estimates that rescuing allows for maintaining a 29% larger colony size. Heavily injured ants that lost too many legs during the fight on the other hand are not helped. Interestingly, this was regulated not by the helper but by the uncooperativeness of the injured ant. I further observed treatment of the injury by nestmates inside the nest through intense allogrooming directly at the wound. Lack of treatment increased mortality from 10% to 80% within 24 hours, with the cause of death most likely being infections.
Collective decision-making is one of the main mechanisms in social insects through which foraging is regulated. However, individual decision-making can also play an important role, depending on the type of foraging behaviour. In M. analis only a handful of individuals (the scouts) hold all the valuable information about foraging sites. I therefore looked at predictions made by optimal foraging theory to better understand the interplay between collective and individual decision-making in this obligate group-raiding predator. I found a clear positive relation between raid size and termite abundance at the foraging site. Furthermore, selectivity of the food source increased with distance. The confirmation of optimal foraging theory suggests that individual scouts must be the main driver behind raid size, choice and raiding behaviour. Therefore most central place foraging behaviours in M. analis were not achieved by collective decisions but rather by individual decisions of scout ants. Thus, 1% of the colony (10–20 scouts) decided the fate and foraging efficiency of the remaining 99%.
Division of labour is one of the main reasons for the success of social insects. Worker polymorphism, age polyethism and work division in more primitive ants, like the ponerines, remain mostly unexplored though. Since M. analis specializes on a defensive prey, adaptations to reduce their foraging costs can be expected. I found that the work division, task allocation and column-formation during the hunt were much more sophisticated than was previously thought. The column-formation was remarkably stable, with the same ants resuming similar positions in subsequent raids and front ants even returning to their positions if displaced in the same raid. Most of the raid tasks were not executed by predetermined members of the raid but were filled out as need arose during the hunt, with a clear preference for larger ants to conduct most tasks.
I show that specialization towards a highly defensive prey can lead to very unique adaptations in the foraging behaviour of a species. I explored experimentally the adaptive value of rescue behaviour focused on injured nestmates in social insects. This was not only limited to selective rescuing of lightly injured individuals by carrying them back (thus reducing predation risk) but moreover includes a differentiated treatment inside the nest. These observations will help to improve our understanding of the evolution of rescue behaviour in animals. I further show that most optimal foraging predictions are fulfilled and regulated by a handful of individuals in M. analis. Lastly, I propose that the continuous allometric size polymorphism in M. analis allows for greater flexibility in task allocation, necessary due to the unpredictability of task requirements in an irregular system such as hunting termites in groups. All of my observations help to further understand how a group-hunting predator should forage so as to minimize costs while maximizing profits.
Economists (should) care about regions! On the one hand this is true because macroeconomic shocks have vastly different effects across regions. The pressing topics of robotization
and artificial intelligence, Brexit, or U.S. tariffs will affect Würzburg differently than Berlin,
implying varying interests among its population, firms and politicians. On the other hand,
shocks in individual regions, such as inventions, bankruptcies or the attraction of a major
plant can, through trade and input-output linkages, magnify to aggregate effects of macroe-
conomic importance. Yet, regional heterogeneities in Germany and the complicated network
of linkages that connect regions are still not well documented nor understood. A fact that
is especially true for local labor markets that are of core interest to regional policy makers
and that also feature substantial heterogeneity.
This thesis provides a thorough quantification of such heterogeneities and an in-depth analysis of the sources and mechanisms that drive these differences.