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Das Borna Disease Virus (BDV, Bornavirus) besitzt ein einzelsträngiges RNA-Genom negativer Polarität und ist innerhalb der Ordnung Mononegavirales der Prototyp einer eigenen Virusfamilie, die der Bornaviridae. Eine außergewöhnliche Eigenschaft des Virus ist seine nukleäre Transkription und Replikation, eine weitere besteht in seiner Fähigkeit, als neurotropes Virus sowohl in vivo als auch in vitro persistente Infektionen zu etablieren. Die zugrunde liegenden Mechanismen sowohl der Replikation als auch der Persistenz sind derzeit noch unzureichend verstanden, auch deshalb, weil das Virus noch relativ „jung“ ist: Erste komplette Sequenzen des RNA-Genoms wurden 1994 publiziert und erst vor einigen Monaten gelang die Generierung rekombinanter Viren auf der Basis klonierter cDNA. Im Mittelpunkt dieser Arbeit standen das p10 Protein und das Phosphoprotein (P), die von der gemeinsamen Transkriptionseinheit II in überlappenden Leserahmen kodiert werden. Als im Kern der Wirtszelle replizierendes Virus ist das Bornavirus auf zelluläre Importmechanismen angewiesen, um den Kernimport aller an der Replikation beteiligten viralen Proteine zu gewährleisten. Das p10 Protein ist ein negativer Regulator der viralen RNA-abhängigen RNA-Polymerase (L). In vitro Importexperimente zeigten, dass p10 über den klassischen Importin alpha/beta abhängigen Kernimportweg in den Nukleus transportiert wird. Dies war unerwartet, da p10 kein vorhersagbares klassisches Kernlokalisierungssignal (NLS) besitzt und weist darauf hin, dass der zelluläre Importapparat offensichtlich flexibler ist als allgemein angenommen. Die ersten 20 N-terminalen AS vermitteln sowohl Kernimport als auch die Bindung an den Importrezeptor Importin alpha. Durch Di-Alanin-Austauschmutagenese wurden die für diesen Transportprozess essentiellen AS identifiziert und die Bedeutung hydrophober und polarer AS-Reste demonstriert. Die Fähigkeit des Bornavirus, persistente Infektionen zu etablieren, wirft die Frage auf, wie das Virus die zellulären antiviralen Abwehrmechanismen, insbesondere das Typ I Interferon (IFN)-System, unterwandert. Das virale P Protein wurde in dieser Arbeit als potenter Antagonist der IFN-Induktion charakterisiert. Es verhindert die Phosphorylierung des zentralen Transkriptionsfaktors IRF3 durch die zelluläre Kinase TBK1 und somit dessen Aktivierung. Der Befund, dass P mit TBK1 Komplexe bildet und zudem auch als Substrat für die zelluläre Kinase fungiert, erlaubt es, erstmalig einen Mechanismus zu postulieren, in dem ein virales Protein (BDV-P) als putatives TBK1-Pseudosubstrat die IRF3-Aktivierung kompetitiv hemmt.
Deciphering the functioning of biological networks is one of the central tasks in systems biology. In particular, signal transduction networks are crucial for the understanding of the cellular response to external and internal perturbations. Importantly, in order to cope with the complexity of these networks, mathematical and computational modeling is required. We propose a computational modeling framework in order to achieve more robust discoveries in the context of logical signaling networks. More precisely, we focus on modeling the response of logical signaling networks by means of automated reasoning using Answer Set Programming (ASP). ASP provides a declarative language for modeling various knowledge representation and reasoning problems. Moreover, available ASP solvers provide several reasoning modes for assessing the multitude of answer sets. Therefore, leveraging its rich modeling language and its highly efficient solving capacities, we use ASP to address three challenging problems in the context of logical signaling networks: learning of (Boolean) logical networks, experimental design, and identification of intervention strategies. Overall, the contribution of this thesis is three-fold. Firstly, we introduce a mathematical framework for characterizing and reasoning on the response of logical signaling networks. Secondly, we contribute to a growing list of successful applications of ASP in systems biology. Thirdly, we present a software providing a complete pipeline for automated reasoning on the response of logical signaling networks.
Gegenstand der Untersuchung sind individuelle und kollektive Einstellungen zu Frauenerwerbstätigkeit im Ländervergleich. Inhalt: Erklärungsansätze - Makrosoziologische Ansätze - Mikrosoziologische Ansätze - Einstellungen zu Frauenerwerbstätigkeit - Einstellungen im Zusammenhang von Makro- und Mikroebene Kulturelle Leitbilder und Wohlfahrtsregimes - Westdeutschland - Ostdeutschland - Großbritannien Arbeitsmarkt und Frauenerwerbsbeteiligung - Frauenerwerbsbeteiligung - Berufsstruktur im Vergleich Der Einstellungsindex zu Frauenerwerbstätigkeit - Einstellungen zu Frauenerwerbstätigkeit - Einstellungsindex zu Frauenerwerbstätigkeit Variation der Einstellungen zu Frauenerwerbstätigkeit - Modell der Binnenvariation - Länderanalyse: Westdeutschland, Ostdeutschland, Großbritannien - Länderspezifische Erklärungsmuster im Vergleich - Interstaatliche Variation der Einstellungen zu Frauenerwerbstätigkeit
Mediterranean ecosystems are particularly vulnerable to climate change and the associated increase in climate anomalies. This study investigates extreme ecosystem responses evoked by climatic drivers in the Mediterranean Basin for the time span 1999–2019 with a specific focus on seasonal variations as the seasonal timing of climatic anomalies is considered essential for impact and vulnerability assessment. A bivariate vulnerability analysis is performed for each month of the year to quantify which combinations of the drivers temperature (obtained from ERA5-Land) and soil moisture (obtained from ESA CCI and ERA5-Land) lead to extreme reductions in ecosystem productivity using the fraction of absorbed photosynthetically active radiation (FAPAR; obtained from the Copernicus Global Land Service) as a proxy.
The bivariate analysis clearly showed that, in many cases, it is not just one but a combination of both drivers that causes ecosystem vulnerability. The overall pattern shows that Mediterranean ecosystems are prone to three soil moisture regimes during the yearly cycle: they are vulnerable to hot and dry conditions from May to July, to cold and dry conditions from August to October, and to cold conditions from November to April, illustrating the shift from a soil-moisture-limited regime in summer to an energy-limited regime in winter. In late spring, a month with significant vulnerability to hot conditions only often precedes the next stage of vulnerability to both hot and dry conditions, suggesting that high temperatures lead to critically low soil moisture levels with a certain time lag. In the eastern Mediterranean, the period of vulnerability to hot and dry conditions within the year is much longer than in the western Mediterranean. Our results show that it is crucial to account for both spatial and temporal variability to adequately assess ecosystem vulnerability. The seasonal vulnerability approach presented in this study helps to provide detailed insights regarding the specific phenological stage of the year in which ecosystem vulnerability to a certain climatic condition occurs.
How to cite.
Vogel, J., Paton, E., and Aich, V.: Seasonal ecosystem vulnerability to climatic anomalies in the Mediterranean, Biogeosciences, 18, 5903–5927, https://doi.org/10.5194/bg-18-5903-2021, 2021.
The Arctic plays a key role in Earth’s climate system as global warming is predicted to be most pronounced at high latitudes and because one third of the global carbon pool is stored in ecosystems of the northern latitudes. In order to improve our understanding of the present and future carbon dynamics in climate sensitive permafrost ecosystems, the present study concentrates on investigations of microbial controls of methane fluxes, on the activity and structure of the involved microbial communities, and on their response to changing environmental conditions. For this purpose an integrated research strategy was applied, which connects trace gas flux measurements to soil ecological characterisation of permafrost habitats and molecular ecological analyses of microbial populations. Furthermore, methanogenic archaea isolated from Siberian permafrost have been used as potential keystone organisms for studying and assessing life under extreme living conditions. Long-term studies on methane fluxes were carried out since 1998. These studies revealed considerable seasonal and spatial variations of methane emissions for the different landscape units ranging from 0 to 362 mg m-2 d-1. For the overall balance of methane emissions from the entire delta, the first land cover classification based on Landsat images was performed and applied for an upscaling of the methane flux data sets. The regionally weighted mean daily methane emissions of the Lena Delta (10 mg m-2 d-1) are only one fifth of the values calculated for other Arctic tundra environments. The calculated annual methane emission of the Lena Delta amounts to about 0.03 Tg. The low methane emission rates obtained in this study are the result of the used remotely sensed high-resolution data basis, which provides a more realistic estimation of the real methane emissions on a regional scale. Soil temperature and near soil surface atmospheric turbulence were identified as the driving parameters of methane emissions. A flux model based on these variables explained variations of the methane budget corresponding to continuous processes of microbial methane production and oxidation, and gas diffusion through soil and plants reasonably well. The results show that the Lena Delta contributes significantly to the global methane balance because of its extensive wetland areas. The microbiological investigations showed that permafrost soils are colonized by high numbers of microorganisms. The total biomass is comparable to temperate soil ecosystems. Activities of methanogens and methanotrophs differed significantly in their rates and distribution patterns along both the vertical profiles and the different investigated soils. The methane production rates varied between 0.3 and 38.9 nmol h-1 g-1, while the methane oxidation ranged from 0.2 to 7.0 nmol h-1 g-1. Phylogenetic analyses of methanogenic communities revealed a distinct diversity of methanogens affiliated to Methanomicrobiaceae, Methanosarcinaceae and Methanosaetaceae, which partly form four specific permafrost clusters. The results demonstrate the close relationship between methane fluxes and the fundamental microbiological processes in permafrost soils. The microorganisms do not only survive in their extreme habitat but also can be metabolic active under in situ conditions. It was shown that a slight increase of the temperature can lead to a substantial increase in methanogenic activity within perennially frozen deposits. In case of degradation, this would lead to an extensive expansion of the methane deposits with their subsequent impacts on total methane budget. Further studies on the stress response of methanogenic archaea, especially Methanosarcina SMA-21, isolated from Siberian permafrost, revealed an unexpected resistance of the microorganisms against unfavourable living conditions. A better adaptation to environmental stress was observed at 4 °C compared to 28 °C. For the first time it could be demonstrated that methanogenic archaea from terrestrial permafrost even survived simulated Martian conditions. The results show that permafrost methanogens are more resistant than methanogens from non-permafrost environments under Mars-like climate conditions. Microorganisms comparable to methanogens from terrestrial permafrost can be seen as one of the most likely candidates for life on Mars due to their physiological potential and metabolic specificity.
Lehramtsstudierende äußern vielfach den Wunsch nach umfangreichen praktischen Lerngelegenheiten. Insbesondere fallbasierte Lehr-Lern-Konzepte scheinen diesen Ansprüchen gerecht zu werden. Dieser Beitrag stellt ein an der Universität Potsdam entwickeltes Seminarkonzept vor, welches diesen Transfer zu fördern versucht. Die Basis des Konzepts bildet der Einsatz erfahrungsbasiert entwickelter Textvignetten pädagogischer Situationen. Im Rahmen der Begleitseminare zum Praktikum in pädagogisch-psychologischen Handlungsfeldern (PppH) wurde die kollegiale Fallbesprechung als eine Form zur angestrebten Transferförderung in dieses Seminarkonzept integriert. Dieser Beitrag skizziert zunächst die erfahrungsbasierte Entwicklung der Vignetten sowie die theoretischen Grundlagen des Seminarkonzepts. Im Anschluss werden die praktische Implementation und erfahrungsbasierte konzeptionelle Änderung (design-based-research) in der Lehre beschrieben sowie erste Ergebnisse der systematischen empirischen Erprobung im Rahmen des PppH vorgestellt. Abschließend diskutieren die Autoren die Herausforderungen der praktischen Umsetzung auch mit Blick auf das Verstetigungsvorhaben.
How do different reset protocols affect ergodicity of a diffusion process in single-particle-tracking experiments? We here address the problem of resetting of an arbitrary stochastic anomalous-diffusion process (ADP) from the general mathematical points of view and assess ergodicity of such reset ADPs for an arbitrary resetting protocol. The process of stochastic resetting describes the events of the instantaneous restart of a particle’s motion via randomly distributed returns to a preset initial position (or a set of those). The waiting times of such resetting events obey the Poissonian, Gamma, or more generic distributions with specified conditions regarding the existence of moments. Within these general approaches, we derive general analytical results and support them by computer simulations for the behavior of the reset mean-squared displacement (MSD), the new reset increment-MSD (iMSD), and the mean reset time-averaged MSD (TAMSD). For parental nonreset ADPs with the MSD(t)∝ tμ we find a generic behavior and a switch of the short-time growth of the reset iMSD and mean reset TAMSDs from ∝ _μ for subdiffusive to ∝ _1 for superdiffusive reset ADPs. The critical condition for a reset ADP that recovers its ergodicity is found to be more general than that for the nonequilibrium stationary state, where obviously the iMSD and the mean TAMSD are equal. The consideration of the new statistical quantifier, the iMSD—as compared to the standard MSD—restores the ergodicity of an arbitrary reset ADP in all situations when the μth moment of the waiting-time distribution of resetting events is finite. Potential applications of these new resetting results are, inter alia, in the area of biophysical and soft-matter systems.
Background
Relatively little is known about protective factors and the emergence and maintenance of positive outcomes in the field of adolescents with chronic conditions. Therefore, the primary aim of the study is to acquire a deeper understanding of the dynamic process of resilience factors, coping strategies and psychosocial adjustment of adolescents living with chronic conditions.
Methods/design
We plan to consecutively recruit N = 450 adolescents (12–21 years) from three German patient registries for chronic conditions (type 1 diabetes, cystic fibrosis, or juvenile idiopathic arthritis). Based on screening for anxiety and depression, adolescents are assigned to two parallel groups – “inconspicuous” (PHQ-9 and GAD-7 < 7) vs. “conspicuous” (PHQ-9 or GAD-7 ≥ 7) – participating in a prospective online survey at baseline and 12-month follow-up. At two time points (T1, T2), we assess (1) intra- and interpersonal resiliency factors, (2) coping strategies, and (3) health-related quality of life, well-being, satisfaction with life, anxiety and depression. Using a cross-lagged panel design, we will examine the bidirectional longitudinal relations between resiliency factors and coping strategies, psychological adaptation, and psychosocial adjustment. To monitor Covid-19 pandemic effects, participants are also invited to take part in an intermediate online survey.
Discussion
The study will provide a deeper understanding of adaptive, potentially modifiable processes and will therefore help to develop novel, tailored interventions supporting a positive adaptation in youths with a chronic condition. These strategies should not only support those at risk but also promote the maintenance of a successful adaptation.
Trial registration
German Clinical Trials Register (DRKS), no. DRKS00025125. Registered on May 17, 2021.
Background
Eating in absence of hunger is quite common and often associated with an increased energy intake co-existent with a poorer food choice. Intuitive eating (IE), i.e., eating in accordance with internal hunger and satiety cues, may protect from overeating. IE, however, requires accurate perception and processing of one’s own bodily signals, also referred to as interoceptive sensitivity. Training interoceptive sensitivity might therefore be an effective method to promote IE and prevent overeating. As most studies on eating behavior are conducted in younger adults and close social relationships influence health-related behavior, this study focuses on middle-aged and older couples.
Methods
The present pilot randomized intervention study aims at investigating the feasibility and effectiveness of a 21-day mindfulness-based training program designed to increase interoceptive sensitivity. A total of N = 60 couples participating in the NutriAct Family Study, aged 50–80 years, will be recruited. This randomized-controlled intervention study comprises three measurement points (pre-intervention, post-intervention, 4-week follow-up) and a 21-day training that consists of daily mindfulness-based guided audio exercises (e.g., body scan). A three-arm intervention study design is applied to compare two intervention groups (training together as a couple vs. training alone) with a control group (no training). Each measurement point includes the assessment of self-reported and objective indicators of interoceptive sensitivity (primary outcome), self-reported indicators of intuitive and maladaptive eating (secondary outcomes), and additional variables. A training evaluation applying focus group discussions will be conducted to assess participants’ overall acceptance of the training and its feasibility.
Discussion
By investigating the feasibility and effectiveness of a mindfulness-based training program to increase interoceptive sensitivity, the present study will contribute to a deeper understanding of how to promote healthy eating in older age.
Die Arbeit beschreibt die Synthese, Charakterisierung und Anwendung von meso- und mikroporösen Hochleistungspolymeren. Im ersten Teil wird die Synthese von mesoporösen Polybenzimidazol (PBI) auf der Basis einer Templatierungsmethode vorgestellt. Auf der Grundlage kommerzieller Monomere und Silikatnanopartikel sowie eines neuen Vernetzers wurde ein Polymer-Silikat-Hybridmaterial aufgebaut. Das Herauslösen des Silikats mit Ammoniumhydrogendifluorid führt zu mesoporösen Polybenzimidazolen mit spherischen Poren von 9 bis 11 nm Durchmesser. Die Abhängigkeit der beobachteten Porosität vom Massenverhältnis Silikat zu Polymer wurde ebenso untersucht wie die Abhängigkeit der Porosität vom Vernetzergehalt. Die Porosität vollvernetzter Proben zeigt eine lineare Abhängigkeit vom Verhältnis Silikat zu Polymer bis zu einem Grenzwert von 1. Wird der Grenzwert überschritten, ist teilweiser Porenkollaps zu beobachten. Die Abhängigkeit der Porosität vom Vernetzergehalt bei festem Silikatgehalt ist nichtlinear. Oberhalb einer kritischen Vernetzerkonzentration wird eine komplette Replikation der Nanopartikel gefunden. Ist die Vernetzerkonzentration dagegen kleiner als der kritische Wert, so ist der völlige Kollaps einiger Poren bei Stabilität der verbleibenden Poren zu beobachten. Ein komplett unporöses PBI resultiert bei Abwesenheit des Vernetzers. Die mesoporösen PBI-Netzwerke konnten kontrolliert mit Phosphorsäure beladen werden. Die erhaltenen Addukte wurden auf ihre Protonenleitfähigkeit untersucht. Es kann gezeigt werden, dass die Nutzung der vordefinierten Morphologie im Vergleich zu einem unstrukturierten PBI in höheren Leitfähigkeiten resultiert. Durch die vernetzte Struktur war des Weiteren genügend mechanische Stabilität gegeben, um die Addukte reversibel und bei sehr guten Leitfähigkeiten bis zu Temperaturen von 190°C bei 0% relativer Feuchtigkeit zu untersuchen. Dies ist für unstrukturierte Phosphorsäure/PBI - Addukte aus linearem PBI nicht möglich. Im zweiten Teil der Arbeit wird die Synthese intrinsisch mikroporöser Polyamide und Polyimide vorgestellt. Das Konzept intrinsisch mikroporöser Polymere konnte damit auf weitere Polymerklassen ausgeweitet werden. Als zentrales, strukturinduzierendes Motiv wurde 9,9'-Spirobifluoren gewählt. Dieses Molekül ist leicht und vielfältig zu di- bzw. tetrafunktionellen Monomeren modifizierbar. Dabei wurden bestehende Synthesevorschriften modifiziert bzw. neue Vorschriften entwickelt. Ein erster Schwerpunkt innerhalb des Kapitels lag in der Synthese und Charakterisierung von löslichen, intrinsisch mikroporösen, aromatischen Polyamid und Polyimid. Es konnte gezeigt werden, dass das Beobachten von Mikroporosität stark von der molekularen Architektur und der Verarbeitung der Polymere abhängig ist. Die Charakterisierung der Porosität erfolgte unter Nutzung von Stickstoffsorption, Kleinwinkelröntgenstreuung und Molecular Modeling. Es konnte gezeigt werden, dass die Proben stark vom Umgebungsdruck abhängigen Deformationen unterliegen. Die starke Quellung der Proben während des Sorptionsvorgangs konnte durch Anwendung des "dual sorption" Modells, also dem Auftreten von Porenfüllung und dadurch induzierter Henry-Sorption, erklärt werden. Der zweite Schwerpunkt des Kapitels beschreibt die Synthese und Charakterisierung mikroporöser Polyamid- und Polyimidnetzwerke. Während Polyimidnetzwerke auf Spirobifluorenbasis ausgeprägte Mikroporosität und spezifische Oberflächen von ca. 1100 m²/g aufwiesen, war die Situation für entsprechende Polyamidnetzwerke abweichend. Mittels Stickstoffsorption konnte keine Mikroporosität nachgewiesen werden, jedoch konnte mittels SAXS eine innere Grenzfläche von ca. 300 m²/g nachgewiesen werden. Durch die in dieser Arbeit gezeigten Experimente kann die Grenze zwischen Polymeren mit hohem freien Volumen und mikroporösen Polymeren somit etwas genauer gezogen werden. ausgeprägte Mikroporosität kann nur in extrem steifen Strukturen nachgewiesen werden. Die Kombination der Konzepte "Mesoporosität durch Templatierung" und "Mikroporosität durch strukturierte Monomere" hatte ein hierarchisch strukturiertes Polybenzimidazol zum Ergebnis. Die Präsenz einer Strukturierung im molekularen Maßstab konnte SAXS bewiesen werden. Das so strukturierte Polybenzimidazol zeichnete sich durch eine höhere Protonenleitfähigkeit im Vergleich zu einem rein mesoporösen PBI aus. Der letzte Teil der Arbeit beschäftigte sich mit der Entwicklung einer neuen Synthesemethode zur Herstellung von Polybenzimidazol. Es konnte gezeigt werden, dass lineares PBI in einer eutektischen Salzschmelze aus Lithium- und Kaliumchlorid synthetisiert werden kann. Die Umsetzung der spirobifluorenbasierten Monomere zu löslichem oder vernetztem PBI ist in der Salzschmelze möglich.
Ziel der Arbeit ist es, einen Vorschlag zur Untersuchung des Mikro-Makro Links zu unterbreiten. Die zentrale These ist, daß die in der westlichen Welt entstandenen Wohlfahrtsstaaten seit ihrer Entstehung wesentlich die Einstellungen der in ihnen lebenden Bevölkerung beeinflußt haben. Inhalt: Die Unterscheidung von Wohlfahrtsstaaten Die Untersuchung von Mikro- Makrozusammenhängen Der Zusammenhang zwischen wohlfahrtsstaatlichen Regimetypen und individuellen Einstellungen - Der Markt-Staat Index - Der Akzeptanz arbeitender Mütter Index
Verfassungsgerichtsbarkeit in der Russischen Föderation und in der Bundesrepublik Deutschland
(2013)
Der Tagungsband enthält die Referate und Diskussionsbeiträge des in Moskau an der Staatlichen Juristischen Kutafin-Universität am 9. und 10. Oktober 2012 durchgeführten Rundtischgespräches zur Verfassungsgerichtsbarkeit. Behandelt werden ausgewählte rechtshistorische und -politische Fragen sowie aktuelle rechtliche Probleme der Verfassungsgerichtsbarkeit in der Russischen Föderation und der Bundesrepublik Deutschland sowohl aus der Sicht der Rechtspraxis als auch der Wissenschaft: insbesondere die Entwicklung der Verfassungsgerichtsbarkeit in Geschichte und Gegenwart, Status, Rechtsnatur und Aufgaben des Verfassungsgerichts in den Subjekten der Föderation und in den Ländern sowie Verfassungsgericht und Gesetzgebung. Zudem werden Spezialfragen der Verfassungsgerichtsbarkeit erörtert, z.B. die Institution des Bevollmächtigten Vertreters des Präsidenten im Verfassungsgericht in Russland, der Eilrechtsschutz durch das BVerfG und der Rechtsschutz bei überlangen Verfahren vor dem BVerfG in Deutschland.
Ziel der hier durchgeführten Analyse war es herauszufinden, ob und inwieweit sich unterschiedliche Wohlfahrtsstaaten auf das Erwerbsverhalten von Frauen nach der Geburt des ersten Kindes auswirken. Dazu wurde ein deutsch-britischer Ländervergleich angestellt. Die beiden Länder dienten exemplarisch für den konservativ-korporatistischen (Deutschland) und den liberalen (Großbritannien) Wohlfahrtsstaatstypus. Inhalt: Teil I Theoretischer Hintergrund 1 Zum Begriff des "Wohlfahrtsstaates" 1.1 Wohlfahrtsstaatstypologien nach Esping-Andersen 2 Wohlfahrtsstaat und Geschlechterverhältnisse 2.1 Kulturelle Rahmenbedingungen zur Erklärung unterschiedlichen Erwerbsverhaltens 3 Der deutsche und der britische Wohlfahrtsstaat 3.1 Wohlfahrtsstaatliche Rahmenbedingungen 3.1.1 Möglichkeiten der Kinderbetreuung 3.1.2 Systeme der Ehegattenbesteuerung 3.1.3 Familienpolitische Regulierungen 3.2 Kulturelle Unterschiede – Entwicklungen der Geschlechterverhältnisse in Deutschland und Großbritannien 3.2.1 Die Entwicklung der Geschlechterverhältnisse in Ost- und Westdeutschland 3.2.2 Die Entwicklung der Geschlechterverhältnisse in Großbritannien 4 Die Bedeutung von Teilzeitbeschäftigung für Frauen 5 Der Einfluss von Bildung und Bildungssystemen auf die Erwerbstätigkeit von Frauen Teil II Empirische Analyse 6 Hypothesenbildung 7 Der Datensatz 8 Ergebnisse 8.1 Deutschland und Großbritannien im Vergleich 8.2 Deutschland – Großbritannien nach Bildungsgruppen Fazit
Extreme habitats often harbor specific communities that differ substantially from non-extreme habitats. In many cases, these communities are characterized by archaea, bacteria and protists, whereas the number of species of metazoa and higher plants is relatively low. In extremely acidic habitats, mostly prokaryotes and protists thrive, and only very few metazoa thrive, for example, rotifers. Since many studies have investigated the physiology and ecology of individual species, there is still a gap in research on direct, trophic interactions among extremophiles. To fill this gap, we experimentally studied the trophic interactions between a predatory protist (Actinophrys sol, Heliozoa) and its prey, the rotifers Elosa woralli and Cephalodella sp., the ciliate Urosomoida sp. and the mixotrophic protist Chlamydomonas acidophila (a green phytoflagellate, Chlorophyta). We found substantial predation pressure on all animal prey. High densities of Chlamydomonas acidophila reduced the predation impact on the rotifers by interfering with the feeding behaviour of A. sol. These trophic relations represent a natural case of intraguild predation, with Chlamydomonas acidophila being the common prey and the rotifers/ciliate and A. sol being the intraguild prey and predator, respectively. We further studied this intraguild predation along a resource gradient using Cephalodella sp. as the intraguild prey. The interactions among the three species led to an increase in relative rotifer abundance with increasing resource (Chlamydomonas) densities. By applying a series of laboratory experiments, we revealed the complexity of trophic interactions within a natural extremophilic community.
Transitional Justice
(2022)
This publication deals with the topic of transitional justice. In six case studies, the authors link theoretical and practical implications in order to develop some innovative approaches. Their proposals might help to deal more effectively with the transition of societies, legal orders and political systems.
Young academics from various backgrounds provide fresh insights and demonstrate the relevance of the topic. The chapters analyse transitions and conflicts in Sierra Leone, Argentina, Nicaragua, Nepal, and South Sudan as well as Germany’s colonial genocide in Namibia. Thus, the book provides the reader with new insights and contributes to the ongoing debate about transitional justice.
To meet the demands of a growing world population while reducing carbon dioxide (CO2) emissions, it is necessary to capture CO2 and convert it into value-added compounds. In recent years, metabolic engineering of microbes has gained strong momentum as a strategy for the production of valuable chemicals. As common microbial feedstocks like glucose directly compete with human consumption, the one carbon (C1) compound formate was suggested as an alternative feedstock. Formate can be easily produced by various means including electrochemical reduction of CO2 and could serve as a feedstock for microbial production, hence presenting a novel entry point for CO2 to the biosphere and a storage option for excess electricity. Compared to the gaseous molecule CO2, formate is a highly soluble compound that can be easily handled and stored. It can serve as a carbon and energy source for natural formatotrophs, but these microbes are difficult to cultivate and engineer. In this work, I present the results of several projects that aim to establish efficient formatotrophic growth of E. coli – which cannot naturally grow on formate – via synthetic formate assimilation pathways. In the first study, I establish a workflow for growth-coupled metabolic engineering of E. coli. I demonstrate this approach by presenting an engineering scheme for the PFL-threonine cycle, a synthetic pathway for anaerobic formate assimilation in E. coli. The described methods are intended to create a standardized toolbox for engineers that aim to establish novel metabolic routes in E. coli and related organisms. The second chapter presents a study on the catalytic efficiency of C1-oxidizing enzymes in vivo. As formatotrophic growth requires generation of both energy and biomass from formate, the engineered E. coli strains need to be equipped with a highly efficient formate dehydrogenase, which provides reduction equivalents and ATP for formate assimilation. I engineered a strain that cannot generate reducing power and energy for cellular growth, when fed on acetate. Under this condition, the strain depends on the introduction of an enzymatic system for NADH regeneration, which could further produce ATP via oxidative phosphorylation. I show that the strain presents a valuable testing platform for C1-oxidizing enzymes by testing different NAD-dependent formate and methanol dehydrogenases in the energy auxotroph strain. Using this platform, several candidate enzymes with high in vivo activity, were identified and characterized as potential energy-generating systems for synthetic formatotrophic or methylotrophic growth in E. coli. In the third chapter, I present the establishment of the serine threonine cycle (STC) – a synthetic formate assimilation pathway – in E. coli. In this pathway, formate is assimilated via formate tetrahydrofolate ligase (FtfL) from Methylobacterium extorquens (M. extorquens). The carbon from formate is attached to glycine to produce serine, which is converted into pyruvate entering central metabolism. Via the natural threonine synthesis and cleavage route, glycine is regenerated and acetyl-CoA is produced as the pathway product. I engineered several selection strains that depend on different STC modules for growth and determined key enzymes that enable high flux through threonine synthesis and cleavage. I could show that expression of an auxiliary formate dehydrogenase was required to achieve growth via threonine synthesis and cleavage on pyruvate. By overexpressing most of the pathway enzymes from the genome, and applying adaptive laboratory evolution, growth on glycine and formate was achieved, indicating the activity of the complete cycle. The fourth chapter shows the establishment of the reductive glycine pathway (rGP) – a short, linear formate assimilation route – in E. coli. As in the STC, formate is assimilated via M. extorquens FtfL. The C1 from formate is condensed with CO2 via the reverse reaction of the glycine cleavage system to produce glycine. Another carbon from formate is attached to glycine to form serine, which is assimilated into central metabolism via pyruvate. The engineered E. coli strain, expressing most of the pathway genes from the genome, can grow via the rGP with formate or methanol as a sole carbon and energy source.
Cosmic rays (CRs) constitute an important component of the interstellar medium (ISM) of galaxies and are thought to play an essential role in governing their evolution. In particular, they are able to impact the dynamics of a galaxy by driving galactic outflows or heating the ISM and thereby affecting the efficiency of star-formation. Hence, in order to understand galaxy formation and evolution, we need to accurately model this non-thermal constituent of the ISM. But except in our local environment within the Milky Way, we do not have the ability to measure CRs directly in other galaxies. However, there are many ways to indirectly observe CRs via the radiation they emit due to their interaction with magnetic and interstellar radiation fields as well as with the ISM.
In this work, I develop a numerical framework to calculate the spectral distribution of CRs in simulations of isolated galaxies where a steady-state between injection and cooling is assumed. Furthermore, I calculate the non-thermal emission processes arising from the modelled CR proton and electron spectra ranging from radio wavelengths up to the very high-energy gamma-ray regime.
I apply this code to a number of high-resolution magneto-hydrodynamical (MHD) simulations of isolated galaxies, where CRs are included. This allows me to study their CR spectra and compare them to observations of the CR proton and electron spectra by the Voyager-1 satellite and the AMS-02 instrument in order to reveal the origin of the measured spectral features.
Furthermore, I provide detailed emission maps, luminosities and spectra of the non-thermal emission from our simulated galaxies that range from dwarfs to Milk-Way analogues to starburst galaxies at different evolutionary stages. I successfully reproduce the observed relations between the radio and gamma-ray luminosities with the far-infrared (FIR) emission of star-forming (SF) galaxies, respectively, where the latter is a good tracer of the star-formation rate. I find that highly SF galaxies are close to the limit where their CR population would lose all of their energy due to the emission of radiation, whereas CRs tend to escape low SF galaxies more quickly. On top of that, I investigate the properties of CR transport that are needed in order to match the observed gamma-ray spectra.
Furthermore, I uncover the underlying processes that enable the FIR-radio correlation (FRC) to be maintained even in starburst galaxies and find that thermal free-free-emission naturally explains the observed radio spectra in SF galaxies like M82 and NGC 253 thus solving the riddle of flat radio spectra that have been proposed to contradict the observed tight FRC.
Lastly, I scrutinise the steady-state modelling of the CR proton component by investigating for the first time the influence of spectrally resolved CR transport in MHD simulations on the hadronic gamma-ray emission of SF galaxies revealing new insights into the observational signatures of CR transport both spectrally and spatially.
We present the first systematic literature review on stress and burnout in K−12 teachers during the COVID-19 pandemic. Based on a systematic literature search, we identified 17 studies that included 9,874 K−12 teachers from around the world. These studies showed some indication that burnout did increase during the COVID-19 pandemic. There were, however, almost no differences in the levels of stress and burnout experienced by K−12 teachers compared to individuals employed in other occupational fields. School principals' leadership styles emerged as an organizational characteristic that is highly relevant for K−12 teachers' levels of stress and burnout. Individual teacher characteristics associated with burnout were K−12 teachers' personality, self-efficacy in online teaching, and perceived vulnerability to COVID-19. In order to reduce stress, there was an indication that stress-management training in combination with training in technology use for teaching may be superior to stress-management training alone. Future research needs to adopt more longitudinal designs and examine the interplay between individual and organizational characteristics in the development of teacher stress and burnout during the COVID-19 pandemic and beyond.
Im 19. Jahrhundert waren Konversationslexika, wie der Name schon andeutet, dazu gedacht, die Konversation in Salon und Vereinen mit Informationen zu bereichern. In den einzelnen Artikeln wurde auf Präzision, Genauigkeit und Überprüfbarkeit gesetzt, um der Leserschaft auch ein eigenes Urteil zu ermöglichen. Die „Seehandlungs-Societät in Preußen“ oder „Seehandlung, preußische“, wie sie in deutschen Lexika vorkommt, wandelte sich im 19. Jahrhundert zur Staatsbank. In der ersten Hälfte des 19. Jahrhunderts fielen die Urteile der Lexika meist ablehnend aus: Die Seehandlung erschien als eine wirtschaftspolitisch katastrophale Fehlentwicklung. Eine besondere Rolle spielte der Präsident Christian (von) Rother, der die Seehandlung zum selbständigen Unternehmen gemacht hatte. Der Wandel der allgemeinen Lexika in der zweiten Hälfte des 19. Jahrhunderts veränderte auch die Sicht auf die Seehandlung. Die Geschäfte der Bank wurden positiv hervorgehoben, die Beurteilungen verwiesen auf Statistiken und Bilanzen. Der Fokus rückte von den leitenden Personen der Seehandlung hin zum Kampf um Handelsmonopole und den preußischen Landtag als öffentlichem Forum. Das vernichtende Urteil der ersten Hälfte des 19. Jahrhunderts war einer differenzierten Bewertung der Bankentätigkeit gewichen.