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Schriftenreihe
- Frontiers in Psychology (2023) 14:1219915. https://doi.org/10.3389/fpsyg.2023.1219915 (1)
- Frontiers in Public Health (2023) 11:1153088. https://doi.org/10.3389/fpubh.2023.1153088 (1)
- International Archives of the History of Ideas / Archives internationales d’histoire des idées 242 (1)
- Methods in Molecular Biology; 2643 (1)
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Die Bodenfeuchte stellt eine essenzielle Variable für den Energie-, Feuchte- und Stoffaustausch zwischen Landoberfläche und Atmosphäre dar. Ihre Auswirkungen auf Temperatur und Niederschlag sind vielfältig und komplex. Die in Klimamodellen verwendeten Schemata zur Simulation der Bodenfeuchte, auch bodenhydrologische Schemata genannt, sind aufgrund des Ursprungs der Klimamodelle aus Wettermodellen jedoch häufig sehr stark vereinfacht dargestellt.
Bei Klimamodellen, die Simulationen mit einer groben Auflösung von mehreren Zehner- oder Hunderterkilometern rechnen, können viele Prozesse vernachlässigt werden. Da die Auflösung der Klimamodelle jedoch stetig steigt und mittlerweile beim koordinierten Projekt regionaler Klimamodelle CORDEX-CORE standardmäßig bei 0.22° Kantenlänge liegt, müssen auch höher aufgelöste Daten und mehr Prozesse simuliert werden. Dies gilt erst recht mit Blick auf konvektionsauflösende Simulationen mit wenigen Kilometern Kantenlänge. Mit steigenden Modellauflösungen steigt zugleich die Komplexität und Differenziertheit der Fragestellungen, die mit Hilfe von Klimamodellen beantwortet werden sollen. An diesem Punkt setzt auch das Projekt BigData@Geo an, in dessen Rahmen die vorliegende Arbeit entstand. Ziel dieses Projektes ist es, hochaufgelöste Klimainformationen für den bayerischen Regierungsbezirk Unterfranken für Akteure aus der Land- und Forstwirtschaft sowie dem Weinbau zur Verfügung zu stellen.
Auf diesen angewandten und grundlegenden Anforderungen und Zielsetzungen basierend, bedarf auch das in dieser Arbeit verwendete regionale Klimamodell REMO (Version 2015) der weiteren Entwicklung. So ist das Hauptziel der Arbeit das bestehende einschichtige bodenhydrologische Schema durch ein mehrschichtiges zu ersetzen. Der Vorteil mehrerer simulierter Bodenschichten besteht darin, dass nun die vertikale Bewegung des Wassers in Form von Versickerung und kapillarem Aufstieg simuliert werden kann. Dies geschieht auf der Basis bodenhydrologischer Parameter, deren Wert in Abhängigkeit vom Boden und der Bodenfeuchte über die Wasserrückhaltekurve bestimmt wird. Für diese Kurve existieren verschiedene Parametrisierungen, von denen die Ansätze von Clapp-Hornberger und van Genuchten verwendet wurden. Außerdem kann die Bodenfeuchte nun bis zu einer Tiefe von circa 10 m beziehungsweise der Tiefe des anstehenden Gesteins simuliert werden. Damit besteht im Gegensatz zum vorherigen Schema, dessen Tiefe auf die Wurzeltiefe beschränkt ist, die Möglichkeit, dass Wasser auch unterhalb der Wurzeln zur Verfügung stehen kann und somit die absolute im Boden verfügbare Wassermenge zunimmt. Die Schichtung erlaubt darüber hinaus die Verdunstung aus unbewachsenem Boden lediglich auf Basis des in der obersten Schicht verfügbaren Wassers. Ein weiterer Prozess, der dank der Schichtung und der weiter unten erläuterten Datensätze neu parametrisiert werden kann, ist die Infiltration.
Für die Verwendung des Schemas sind Informationen über bodenhydrologische Parameter, die Wurzeltiefe und die Tiefe bis zum anstehenden Gestein erforderlich. Entsprechende Datensätze müssen hierfür aufbereitet und in das Modell eingebaut werden. Bezüglich der Wurzeltiefe wurden drei sich bezüglich der Tiefe, der Definition und der verfügbaren Auflösung stark voneinander unterscheidende Datensätze verglichen. Letztendlich wird die Wurzeltiefe aus dem mit einer anderen REMO-Version gekoppelten Vegetationsmodul iMOVE verwendet, da zukünftig eine Kopplung dieses Moduls mit dem mehrschichtigen Boden geplant ist und die Wurzeltiefen damit konsistent sind. Zudem ist die zugrundeliegende Auflösung der Daten hoch und es werden maximale Wurzeltiefen berücksichtigt, die besonders wichtig für die Simulation von Landoberfläche-Atmosphäre-Interaktionen sind. Diese Vorteile brachten die anderen Datensätze nicht mit. In der finalen Modellversion werden für die Tiefe bis zum anstehenden Gestein und die Korngrößenverteilungen die Daten von SoilGrids verwendet. Ein Vergleich mit anderen Bodendatensätzen fand in einer parallel laufenden Dissertation statt (Ziegler 2022). Bei SoilGrids ist hervorzuheben, dass die Korngrößenverteilungen in einer hohen räumlichen Auflösung (1 km^2 oder höher) und mit mehreren vertikalen Schichten vorliegen. Gegenüber dem ursprünglich in REMO verwendeten Datensatz mit einer Kantenlänge von 0.5° und ohne vertikale Differenzierung ist dies eine starke Verbesserung der Eingangsdaten. Dazu kommt, dass die Korngrößenverteilungen die Verwendung kontinuierlicher Pedotransferfunktionen statt fünf diskreter Texturklassen, denen für die bodenhydrologischen Parameter fixe Tabellenwerte zugewiesen werden, ermöglichen. Dies führt zu einer deutlich besseren Differenzierung des heterogenen Bodens.
Im Rahmen der Arbeit wurden insgesamt 19 Simulationen für Europa und ein erweitertes Deutschlandgebiet mit Auflösungen von 0.44° beziehungsweise 0.11° für den Zeitraum 2000 bis 2018 gerechnet. Dabei zeigte sich, dass die Einführung des mehrschichtigen Bodenschemas gegenüber dem einschichtigen Schema zu einer Verringerung der Bodenfeuchte in der Wurzeltiefe führt. Nichtsdestotrotz nimmt die absolute Wassermenge des Bodens durch die Berücksichtigung des Bodens unterhalb der Wurzelzone zu. Bezogen auf die einzelnen Schichten wird die Bodenfeuchte damit zwar unterschätzt, im Laufe der Modellentwicklung kann jedoch eine Verbesserung im Vergleich zu ERA5 erzielt werden. Das neue Schema führt zu einer Verringerung der Evapotranspiration, die über alle Schritte der Modellentwicklung und besonders während der Sommermonate auftritt. Im Vergleich zu Validationsdaten von ERA5 und GLEAM zeigt sich, dass dies eine Verbesserung dieser Größe bedeutet, die sowohl in der Fläche als auch beim Fehler und in der Verteilung auftritt.
Gleiches lässt sich für den Oberflächenabfluss sagen. Hierfür implementierte Schemata (Philip, Green-Ampt), die anders als das standardmäßig verwendete Improved-Arno-Schema bodenhydrologische Parameter berücksichtigen, konnten eine weitere Verbesserung im Flachland zeigen. In Gebirgsregionen nahm der Fehler durch die nicht enthaltene Berücksichtigung der Hangneigung jedoch zu, sodass in der finalen Modellversion auf das Improved-Arno-Schema zurückgegriffen wurde. Die Temperatur steigt durch die ursprüngliche Version des mehrschichtigen Schemas zunächst an, was zu einer Über- statt der vorherigen Unterschätzung gegenüber E-OBS führt. Die Modellentwicklung resultiert zwar in einer Reduzierung der Temperatur, jedoch fällt diese zu stark aus, sodass der Temperaturfehler letztendlich größer als in der einschichtigen Modellversion ist. Da die Evapotranspiration jedoch maßgeblich verbessert wurde, kann dieser Fehler eventuell auf ein übermäßiges Tuning der Temperatur zurückgeführt werden.
Die Betrachtung von Hitzeereignissen am Beispiel der Sommer 2003 und 2018 hat gezeigt, dass die Modellentwicklung dazu beiträgt, diese Ereignisse besser als das einschichtige Schema zu simulieren. Zwar trifft dies nicht auf das räumliche Verhalten der mittleren Temperatur zu, jedoch auf deren zeitlichen Verlauf. Hinzu kommt die bessere Simulation der täglichen Extrem- und besonders der Minimaltemperatur, was zu einer Erhöhung der täglichen Temperaturspanne führt. Diese wird von Klimamodellen in der Regel zu stark unterschätzt.
Durch die Berücksichtigung der vertikalen Wasserflüsse hat sich jedoch auch gezeigt, dass noch enormes Entwicklungspotenzial mit Blick auf (boden)hydrologische Prozesse besteht. Dies gilt in besonderem Maße für zukünftige Simulationen mit konvektionserlaubender Auflösung. So sollten subskalige Informationen des Bodens und der Orographie berücksichtigt werden. Dies dient einerseits der Repräsentation vorliegender Heterogenitäten und kann andererseits, wie am Beispiel der Infiltrationsschemata dargelegt, zur Verbesserung bestehender Prozesse beitragen. Da die simulierte Drainage durch das mehrschichtige Bodenschema im gleichen Maße zu- wie der Oberflächenabfluss abnimmt und das Wasser dem Modell in der Folge nicht weiter zur Verfügung steht, sollte zukünftig auch Grundwasser im Modell berücksichtigt werden. Eine Vielzahl von Studien konnte einen Mehrwert durch die Implementierung dieser Variable und damit verbundener Prozesse feststellen. Mittelfristig ist jedoch insgesamt die Kopplung an ein hydrologisches Modell zu empfehlen, um die bei hochauflösenden Simulationen relevanten Prozesse angemessen repräsentieren zu können. Hierfür bieten sich beispielsweise ParFlow oder mHM an.
Insgesamt ist festzuhalten, dass das mehrschichtige Bodenschema einen Mehrwert liefert, da schwer zu simulierende und in der Postprozessierung zu korrigierende Variablen wie die Evapotranspiration und der Oberflächenabfluss deutlich besser modelliert werden können als mit dem einschichtigen Schema. Dies gilt auch für die Extremtemperaturen. Beides ist klar auf die Schichtung des Bodens und damit einhergehender Prozesse zurückzuführen. Bezüglich der Daten zeigt sich, dass die Wurzeltiefe, die Berücksichtigung von SoilGrids und die vertikale Bodeninformation für die weitere Optimierung verantwortlich sind. Darüber hinaus ist der höhere Informationsgehalt, der anhand der geschichteten Bodenfeuchte zur Verfügung steht, ebenfalls als Mehrwert einzustufen.
Given the growing interest of corporate stakeholders in Metaverse applications, there is a need to understand accessibility of these technologies for marginalized populations such as people living with dementia to ensure inclusive design of Metaverse applications. We assessed the accessibility of extended reality technology for people living with mild cognitive impairment and dementia to develop accessibility guidelines for these technologies. We used four strategies to synthesize evidence for barriers and facilitators of accessibility: (1) Findings from a non-systematic literature review, (2) guidelines from well-researched technology, (3) exploration of selected mixed reality technologies, and (4) observations from four sessions and video data of people living with dementia using mixed reality technologies. We utilized template analysis to develop codes and themes towards accessibility guidelines. Future work can validate our preliminary findings by applying them on video recordings or testing them in experiments.
In dieser Dissertation wird beschrieben, wie es durch systematische Anwendung unterschiedlicher Methoden zur Herstellung und Modifizierung von Diamant gezielt und verlässlich möglich ist, die Eigenschaften von Diamanten zu beeinflussen. Es wird gezeigt, wie durch Variation der Parameter bei dem Wachstum von Diamant Einfluss auf dessen Morphologie und Eigenschaften genommen werden kann. Des Weiteren wird ein Verfahren vorgestellt, mit dem die Oberfläche des Diamanten durch Ozon effizient oxidiert beziehungsweise reduziert werden kann. Um diese veränderte Oberflächenbelegung möglichst genau zu analysieren, wird im letzten Teil der Dissertation eine Methode zur qualitativen und quantitativen Analytik der Oberflächen von Kohlenstoffnanomaterialien beschrieben.
Insights;
(2023)
The cluster of texts assembled here were imagined, crafted, and brought together as a collaborative writing project that emerged from the seminar titled "Words Matter Worlds: Activist Scholarship and Literary Praxis," which convened over the course of the 2021/22 winter semester as an offering of the American Studies department of the Julius-Maximilians-Universität Würzburg. Like the seminar that nurtured the considerations that evolve here, these contributions engage with how scholarly writing practices in general, and literary and cultural studies in particular, can remake the world.
Platelets play an important role in the body, since they are part of the hemostasis
system, preventing and stopping blood loss. Nevertheless, when platelet or
coagulation system function are impaired, uncontrolled bleedings but also irreversible
vessel occlusion followed by ischemic tissue damage can occur. Therefore,
understanding platelet function and activation, mechanisms which are controlled by a
variety of platelet membrane receptors and other factors is important to advance out
knowledge of hemostasis and platelet malfunction. For a complete picture of platelet
function and their modulating behavior it is desired to be able to quantify receptor
distributions and interactions of these densely packed molecular ensembles in the
membrane. This challenges scientists for several reasons. Most importantly, platelets
are microscopically small objects, challenging the spatial resolution of conventional
light microscopy. Moreover, platelet receptors are highly abundant on the membrane
so even super-resolution microscopy struggles with quantitative receptor imaging on
platelets.
With Expansion microscopy (ExM), a new super-resolution technique was introduced,
allowing resolutions to achieve super-resolution without using a super-resolution
microscope, but by combining a conventional confocal microscopy with a highly
processed sample that has been expanded physically. In this doctoral thesis, I
evaluated the potential of this technique for super-resolution platelet imaging by
optimizing the sample preparation process and establishing an imaging and image
processing pipeline for dual-color 3D images of different membrane receptors. The
analysis of receptor colocalization using ExM demonstrated a clear superiority
compared to conventional microscopy. Furthermore, I identified a library of
fluorescently labeled antibodies against different platelet receptors compatible with
ExM and showed the possibility of staining membrane receptors and parts of the
cytoskeleton at the same time.
In the recent years, translational studies comparing imaging data of animals and humans have gained increasing
scientific interests with crucial findings stemming from both, human and animal work. In order to harmonize
statistical analyses of data from different species and to optimize the transfer of knowledge between them, shared
data acquisition protocols and combined statistical approaches have to be identified. Following this idea, methods
of data analysis, which have until now mainly been used to model neural responses of electrophysiological
recordings from rodent data, were applied on human hemodynamic responses (i.e. Blood-Oxygen-Level-
Dependent BOLD signal) as measured via functional magnetic resonance imaging (fMRI).
At the example of two attention and impulsivity networks, timing dynamics and amplitude of the fMRI signal were
determined (study 1). Study 2 described the same parameters frequency-specifically, and in study 3, the
complexity of neural processing was quantified in terms of fractality. Determined parameters were compared with
regard to the subjects’ task performance / impulsivity to validate findings with regard to reports of the current
scientific debate.
In a general discussion, overlapping as well as additional information of methodological approaches were
discussed with regard to its potential for biomarkers in the context of neuropsychiatric disorders.
In dieser Arbeit wird die intraoperative Boost-Bestrahlung mit 9 oder 20 Gy bei Mammakarzinompatientinnen evaluiert. Es werden das onkologische Ergebnis, die bestrahlungsassoziierte Toxizität, das kosmetische Therapieergebnis und die Lebensqualität ausgewertet. Die Analyse bezieht sich auf 124 Fälle im frühen Brustkrebsstadium.
We propose that false beliefs about own current economic status are an important factor for explaining populist attitudes. Eliciting subjects’ receptiveness to rightwing populism and their perceived relative income positions in a representative survey of German households, we find that people with pessimistic beliefs about their income position are more attuned to populist statements. Key to understanding the misperception-populism relationship are strong gender differences in the mechanism: men are much more likely to channel their discontent into affection for populist ideas. A simple information provision does neither sustainably reduce misperception nor curb populism.
Background and Objectives: Chronic painful midportion Achilles combined with plantaris tendinopathy can be a troublesome condition to treat. The objective was to prospectively follow patients subjected to ultrasound (US)- and color doppler (CD)-guided wide awake, local anesthetic, no-tourniquet (WALANT) surgery in a private setting. Material and Methods: Twenty-six Swedish patients (17 men and 9 women, mean age 50 years (range 29–62)) and eight international male patients (mean age of 38 years (range 25–71)) with combined midportion Achilles and plantaris tendinopathy in 45 tendons altogether were included. All patients had had >6 months of pain and had tried non-surgical treatment with eccentric training, without effect. US + CD-guided surgical scraping of the ventral Achilles tendon and plantaris removal under local anesthesia was performed on all patients. A 4–6-week rehabilitation protocol with an immediate full-weight-bearing tendon loading regime was used. The VISA-A score and a study-specific questionnaire evaluating physical activity level and subjective satisfaction with the treatment were used for evaluation. Results: At the 1-year follow-up, 32/34 patients (43 tendons) were satisfied with the treatment result and had returned to their pre-injury Achilles tendon loading activity. There were two dropouts (two tendons). For the Swedish patients, the mean VISA-A score increased from 34 (0–64) before surgery to 93 (61–100) after surgery (p < 0.001). There were two complications, one wound rupture and one superficial skin infection. Conclusions: For patients suffering from painful midportion Achilles tendinopathy and plantaris tendinopathy, US + CD-guided surgical Achilles tendon scraping and plantaris tendon removal showed a high satisfaction rate and good functional results 1 year after surgery.
“In Other News”: China’s International Media Strategy on Xinjiang — CGTN and New China TV on YouTube
(2023)
In the Western world China stands accused of severe human rights violations regarding its treatment of the Uyghurs and other predominantly Muslim minorities in its northwestern Xinjiang Uyghur Autonomous Region. This is the first article to systematically analyze the response of China’s international state media to these allegations. By studying the YouTube channels of two leading Chinese state media, China Global Television Network (CGTN) and New China TV (operated by Xinhua News Agency), it presents an indepth understanding of how China’s foreign-facing propaganda works in a crucial case. The quantitative content analysis highlights how China reacted to increasing international (mostly United States) pressure regarding its Xinjiang policies by producing higher volumes of videos and putting out new counternarratives. The qualitative analysis that follows provides in-depth treatment of the most important discourses that Chinese media engage in to salvage the nation’s international image, namely those on development, culture, nature, and terrorism. It finds several ways of countering criticism, ranging from presenting a positive image of China, in line with traditional propaganda guidelines and President Xi Jinping’s assignment to state media to “tell the China story well,” to more innovative approaches. Thus the development narrative becomes more personalized, the discourse on culture supports the “heritagization process” to incorporate minority cultures into a harmonized “Chinese civilization,” representations of nature firmly tie Xinjiang into the discourse of “beautiful China,” the “terror narrative” strategically employs shocking footage in an attempt to gain international “discourse power,” etc. The article provides an up-to-date picture of China’s state media strategy on a highly contentious international issue.
Background: Large Cell Neuroendocrine Carcinoma (LCNEC) is a rare subtype of lung cancer with poor clinical outcomes. Data on recurrence-free survival (RFS) in early and locally advanced pure LCNEC after complete resection (R0) are lacking. This study aims to evaluate clinical outcomes in this subgroup of patients and to identify potential prognostic markers. Methods: Retrospective multicenter study including patients with pure LCNEC stage I-III and R0 resection. Clinicopathological characteristics, RFS, and disease-specific survival (DSS) were evaluated. Univariate and multivariate analyses were performed. Results: 39 patients (M:F = 26:13), with a median age of 64 years (44–83), were included. Lobectomy (69.2%), bilobectomy (5.1%), pneumonectomy (18%), and wedge resection (7.7%) were performed mostly associated with lymphadenectomy. Adjuvant therapy included platinum-based chemotherapy and/or radiotherapy in 58.9% of cases. After a median follow-up of 44 (4–169) months, the median RFS was 39 months with 1-, 2- and 5-year RFS rates of 60.0%, 54.6%, and 44.9%, respectively. Median DSS was 72 months with a 1-, 2- and 5-year rate of 86.8, 75.9, and 57.4%, respectively. At multivariate analysis, age (cut-off 65 years old) and pN status were independent prognostic factors for both RFS (HR = 4.19, 95%CI = 1.46–12.07, p = 0.008 and HR = 13.56, 95%CI 2.45–74.89, p = 0.003, respectively) and DSS (HR = 9.30, 95%CI 2.23–38.83, p = 0.002 and HR = 11.88, 95%CI 2.28–61.84, p = 0.003, respectively). Conclusion: After R0 resection of LCNEC, half of the patients recurred mostly within the first two years of follow-up. Age and lymph node metastasis could help to stratify patients for adjuvant therapy.
This work developed during the first funding period of the subproject B05 in the framework of the interdisciplinary research consortium TRR 225 ‘From the Fundamentals of Biofabrication toward functional Tissue Models’ and was part of a cooperation between the Orthopedic Department represented by Prof. Dr. Regina Ebert and the Institute of Organic Chemistry represented by Prof. Dr. Jürgen Seibel.
This project dealed with cellular behavior during the bioprinting process and how to influence it by modifying the cell glycocalyx with functional target molecules. The focus was on the impact of potential shear stress, that cells experience when they get processed in thermoresponsive bioinks, and a way to increase the cell stiffness via metabolic glycoengineering to attenuate shear forces. For the characterization of the metabolic glycoengineering, four different peracetylated and four non-acetylated modified monosaccharides (two mannose and two sialic acid sugars) were tested in primary human mesenchymal stromal cells (hMSC) and telomerase-immortalized hMSC (hMSC-TERT). Viability results demonstrated a dose-dependent correlation for all sugars, at which hMSC-TERT seemed to be more susceptible leading to lower viability rates. The assessment of the incorporation efficiencies was performed by click chemistry using fluorescent dyes and revealed also a dose-dependent correlation for all mannose and sialic acid sugars, while glucose and galactose variants were not detected in the glycocalyx. However, incorporation efficiencies were highest when using mannose sugars in the primary hMSC. A subsequent analysis of the temporal retention of the incorporated monosaccharides showed a constant declining fluorescence signal up to 6 d for azido mannose in hMSC-TERT, whereas no signal could be detected for alkyne mannose after 2 d. Investigation of the differentiation potential and expression of different target genes revealed no impairment after incubation with mannose sugars, indicating a normal phenotype for hMSC-TERT. Following the successful establishment of the method, either a coumarin derivative or an artificial galectin 1 ligand were incorporated into the cell glycocalyx of hMSC-TERT as functional target molecule. The biophysical analysis via shear flow deformation cytometry revealed a slightly increased cell stiffness and lowered fluidity for both molecules. A further part of this project aimed to control lectin-mediated cell adhesion by artificial galectin 1 ligands. As that hypothesis was settled in the work group of Prof. Dr. Jürgen Seibel, this work supported with an initial characterization of galectin 1 as part of the hMSC biology. A stable galectin 1 expression at gene and protein level in both hMSC and hMSC-TERT could be confirmed, at which immunocytochemical stainings could detect the protein only in the glycocalyx. The treatment of hMSC-TERT with a galectin 1 ligand in different concentrations did not show an altered gene expression of galectin 1. However, these first data in addition to the investigation of stiffness confirmed the applicability of specific and artificial
IV
galectin 1 ligands in biofabrication approaches to alter cell properties of hMSC. To conclude, metabolic glycoengineering has been successfully implemented in hMSC and hMSC-TERT to introduce glycocalyx modifications which reside there for several days. A proof of concept was carried out by the increase of cell stiffness and fluidity by the incorporation of a coumarin derivative or an artificial galectin 1 ligand.
For the characterization of shear stress impact on cells after printing in thermoresponsive bioinks, the processing of hMSC-TERT (mixing or additionally printing) with Pluronic F127 or Polyoxazoline-Polyoxazine (POx-POzi) polymer solution was investigated. While there were no changes in viability when using POx-POzi bioink, processing with Pluronic F127 indicated slightly lower viability and increased apoptosis activity. Assessment of cellular responses to potential shear stress showed no reorganization of the cytoskeleton independent of the bioink, but highly increased expression of the mechanoresponsive proto-oncogene c Fos which was more pronounced when using Pluronic F127 and just mixed with the bioinks. Interestingly, processing of the mechanoresponsive reporter cell line hMSC-TERT-AP1 revealed slightly elevated mechanotransduction activity when using POx-POzi polymer and just mixed with the bioinks as well. In conclusion, hMSC-TERT embedded in thermoresponsive bioinks might shortly experience shear stress during the printing process, but that did not lead to remarkable cell damage likely due to the rheological properties of the bioinks. Furthermore, the printing experiments also suggested that cells do not sense more shear stress when additionally printed.
Infectious diseases caused by pathogenic microorganisms are one of the largest socioeconomic burdens today. Although infectious diseases have been studied for decades, in numerous cases, the precise mechanisms involved in the multifaceted interaction between pathogen and host continue to be elusive. Thus, it still remains a challenge for researchers worldwide to develop novel strategies to investigate the molecular context of infectious diseases in order to devise preventive or at least anti-infective measures. One of the major drawbacks in trying to obtain in-depth knowledge of how bacterial pathogens elicit disease is the lack of suitable infection models to authentically mimic the disease progression in humans. Numerous studies rely on animal models to emulate the complex temporal interactions between host and pathogen occurring in humans. While they have greatly contributed to shed light on these interactions, they require high maintenance costs, are afflicted with ethical drawbacks, and are not always predictive for the infection outcome in human patients. Alternatively, in-vitro two-dimensional (2D) cell culture systems have served for decades as representatives of human host environments to study infectious diseases. These cell line-based models have been essential in uncovering virulence-determining factors of diverse pathogens as well as host defense mechanisms upon infection. However, they lack the morphological and cellular complexity of intact human tissues, limiting the insights than can be gained from studying host-pathogen interactions in these systems.
The focus of this thesis was to establish and innovate intestinal human cell culture models to obtain in-vitro reconstructed three-dimensional (3D) tissue that can faithfully mimic pathogenesis-determining processes of the zoonotic bacterium Campylobacter jejuni (C. jejuni). Generally employed for reconstructive medicine, the field of tissue engineering provides excellent tools to generate organ-specific cell culture models in vitro, realistically recapitulating the distinctive architecture of human tissues. The models employed in this thesis are based on decellularized extracellular matrix (ECM) scaffolds of porcine intestinal origin. Reseeded with intestinal human cells, application of dynamic culture conditions promoted the formation of a highly polarized mucosal epithelium maintained by functional tight and adherens junctions. While most other in-vitro infection systems are limited to a flat monolayer, the tissue models developed in this thesis can display the characteristic 3D villi and crypt structure of human small intestine.
First, experimental conditions were established for infection of a previously developed, statically cultivated intestinal tissue model with C. jejuni. This included successful isolation of bacterial colony forming units (CFUs), measurement of epithelial barrier function, as well as immunohistochemical and histological staining techniques. In this way, it became possible to follow the number of viable bacteria during the infection process as well as their translocation over the polarized epithelium of the tissue model. Upon infection with C. jejuni, disruption of tight and adherens junctions could be observed via confocal microscopy and permeability measurements of the epithelial barrier. Moreover, C. jejuni wildtype-specific colonization and barrier disruption became apparent in addition to niche-dependent bacterial localization within the 3D microarchitecture of the tissue model. Pathogenesis-related phenotypes of C. jejuni mutant strains in the 3D host environment deviated from those obtained with conventional in-vitro 2D monolayers but mimicked observations made in vivo. Furthermore, a genome-wide screen of a C. jejuni mutant library revealed significant differences for bacterial factors required or dispensable for interactions with unpolarized host cells or the highly prismatic epithelium provided by the intestinal tissue model. Elucidating the role of several previously uncharacterized factors specifically important for efficient colonization of a 3D human environment, promises to be an intriguing task for future research.
At the frontline of the defense against invading pathogens is the protective, viscoelastic mucus layer overlying mucosal surfaces along the human gastrointestinal tract (GIT). The development of a mucus-producing 3D tissue model in this thesis was a vital step towards gaining a deeper understanding of the interdependency between bacterial pathogens and host-site specific mucins. The presence of a mucus layer conferred C. jejuni wildtype-specific protection against epithelial barrier disruption by the pathogen and prevented a high bacterial burden during the course of infection. Moreover, results obtained in this thesis provide evidence in vitro that the characteristic corkscrew morphology of C. jejuni indeed grants a distinct advantage in colonizing mucous surfaces.
Overall, the results obtained within this thesis highlight the strength of the tissue models to combine crucial features of native human intestine into accessible in-vitro infection models. Translation of these systems into infection research demonstrated their ability to expose in-vivo like infection outcomes. While displaying complex organotypic architecture and highly prismatic cellular morphology, these tissue models still represent an imperfect reflection of human tissue. Future advancements towards inclusion of human primary and immune cells will strive for even more comprehensive model systems exhibiting intricate multicellular networks of in-vivo tissue. Nevertheless, the work presented in this thesis emphasizes the necessity to investigate host-pathogen interactions in infection models authentically mimicking the natural host environment, as they remain among the most vital parts in understanding and counteracting infectious diseases.
Modern lifestyle is often at odds with endogenously driven rhythmicity, which can lead to circadian disruption and metabolic syndrome. One signature for circadian disruption is a reduced or altered metabolite cycling in the circulating tissue reflecting the current metabolic status. Drosophila is a well-established model in chronobiology, but day-time dependent variations of transport metabolites in the fly circulation are poorly characterized. Here, we sampled fly hemolymph throughout the day and analyzed diacylglycerols (DGs), phosphoethanolamines (PEs) and phosphocholines (PCs) using LC-MS. In wild-type flies kept on sugar-only medium under a light-dark cycle, all transport lipid species showed a synchronized bimodal oscillation pattern with maxima at the beginning and end of the light phase which were impaired in period01 clock mutants. In wild-type flies under constant dark conditions, the oscillation became monophasic with a maximum in the middle of the subjective day. In strong support of clock-driven oscillations, levels of the targeted lipids peaked once in the middle of the light phase under time-restricted feeding independent of the time of food intake. When wild-type flies were reared on full standard medium, the rhythmic alterations of hemolymph lipid levels were greatly attenuated. Our data suggest that the circadian clock aligns daily oscillations of DGs, PEs, and PCs in the hemolymph to the anabolic siesta phase, with a strong influence of light on phase and modality.
The presented thesis deals with the investigation of the characteristic physical properties of lead-free double perovskites. For this purpose lead-free double perovskite single crystals were grown from solution. In order to assess the influence of growth temperature on tail states in the material, the crystals were studied using Photoluminescence Excitation (PLE) and Transmission measurements. Additionally, lead-free double perovskite solar cells and thin films were investigated to address the correlation of precursor stoichiometry and solar cell efficiency. In a last step a new earth abundant lead-free double perovskite was introduced and its physical properties were studied by photoluminescene and absorptance. Like this it was possible to assess the suitability of this material for solar cell applications in the future.
The present cumulative dissertation summarizes three clinical studies, which examine
subgroups of patients within the fibromyalgia syndrome (FMS). FMS entails chronic pain and
associated symptoms, and its pathophysiology is incompletely understood (1). Previous studies
show that there is a subgroup of patients with FMS with objective histological pathology of the
small nerve fibers of the peripheral nervous system (PNS). Another subgroup of FMS patients
does not show any signs of pathological changes of the small nerve fibers. The aim of this
dissertation was to compare FMS patients with healthy controls, and these two FMS subgroups
for differences in the central nervous system (CNS) in order to explore possible interactions
between PNS and the CNS. Regarding the CNS, differences of FMS patients with healthy
controls have already been found in studies with small sample sizes, but no subgroups have yet
been identified. Another aim of this thesis was to test whether the subgroups show a different
response to different classes of pain medication. The methods used in this thesis are structural
and functional magnetic resonance imaging (MRI), magnetic resonance diffusion imaging and
magnetic resonance spectroscopy. For the evaluation of clinical symptoms, we used
standardized questionnaires. The subgroups with and without pathologies of the PNS were
determined by skin biopsies of the right thigh and lower leg based on the intraepidermal nerve
fiber density (IENFD) of the small nerve fibers.
1) In the first MRI study, 43 female patients with the diagnosis of FMS and 40 healthy
control subjects, matched in age and body mass index, were examined with different MRI
sequences. Cortical thickness was investigated by structural T1 imaging, white matter integrity
by diffusion tensor imaging and functional connectivity within neuronal networks by functional
resting state MRI. Compared to the controls, FMS patients had a lower cortical volume in
bilateral frontotemporoparietal regions and the left insula, but a higher cortical volume in the
left pericalcarine cortex. Compared to the subgroup without PNS pathology, the subgroup with
PNS pathology had lower cortical volume in both pericalcarine cortices. Diffusion tensor
imaging revealed an increased fractional anisotropy (FA) of FMS patients in corticospinal
pathways such as the corona radiata, but also in regions of the limbic systems such as the fornix
and cingulum. Subgroup comparison again revealed lower mean FA values of the posterior
thalamic radiation and the posterior limb of the left internal capsule in the subgroup with PNS
pathology. In the functional connectivity analysis FMS patients, compared to controls, showed
a hypoconnectivity between the right median frontal gyrus and the posterior cerebellum and
the right crus cerebellum, respectively. In the subgroup comparisons, the subgroup with PNS
pathology showed a hyperconnectivity between both inferior frontal gyri, the right posterior
parietal cortex and the right angular gyrus. In summary, these results show that differences in
brain morphology and functional connectivity exist between FMS patients with and without
PNS pathology. These differences were not associated with symptom duration or severity and,
in some cases, have not yet been described in the context of FMS. The differences in brain
morphology and connectivity between subgroups could also lead to a differential response to
treatment with centrally acting drugs. Further imaging studies with FMS patients should take
into account this heterogeneity of FMS patient cohorts.
2) Following the results from the first MRI study, drug therapies of FMS patients and
their treatment response were compared between PNS subgroups. As there is no licensed drug
for FMS in Europe, the German S3 guideline recommends amitriptyline, duloxetine and
pregabalin for temporary use. In order to examine the current drug use in FMS patients in
Germany on a cross-sectional basis, 156 patients with FMS were systematically interviewed.
The drugs most frequently used to treat pain in FMS were non-steroidal anti-inflammatory
drugs (NSAIDs) (28.9%), metamizole (15.4%) and amitriptyline (8.8%). Pain relief assessed by
patients on a numerical rating scale from 0-10 averaged 2.2 points for NSAIDs, 2.0 for
metamizole and 1.5 for amitriptyline. Drugs that were discontinued for lack of efficacy and not
for side effects were acetaminophen (100%), flupirtine (91.7%), selective serotonin reuptake
inhibitors (81.8%), NSAIDs (83.7%) and weak opioids (74.1%). Patients were divided into
subgroups with and without PNS pathology as determined by skin biopsies. We found no
differences in drug use and effect between the subgroups. Taken together, these results show
that many FMS patients take medication that is not in accordance with the guidelines. The
reduction of symptoms was best achieved with metamizole and NSAIDs. Further longitudinal
studies on medication in FMS are necessary to obtain clearer treatment recommendations.
3) Derived from previous pharmacological and imaging studies (with smaller case
numbers), there is a hypothesis in the FMS literature that hyperreactivity of the insular cortex
may have an impact on FMS. The hyperreactivity seems to be due to an increased concentration
of the excitatory neurotransmitter glutamate in the insular cortex of FMS patients. The
hypothesis is supported by magnetic resonance spectroscopy studies with small number of
cases, as well as results from pharmacological studies with glutamate-inhibiting medication.
Studies from animal models have also shown that an artificially induced increase in glutamate
in the insular cortex can lead to reduced skin innervation. Therefore, the aim of this study was
to compare glutamate and GABA concentrations in the insular cortex of FMS patients with
those of healthy controls using magnetic resonance imaging. There was no significant
difference of both neurotransmitters between the groups. In addition, there was no correlation
between the neurotransmitter concentrations and the severity of clinical symptoms. There
were also no differences in neurotransmitter concentrations between the subgroups with and
without PNS pathology. In conclusion, our study could not show any evidence of a correlation
of glutamate and GABA concentrations with the symptoms of FMS or the pathogenesis of
subgroups with PNS pathologies.
Copy number variations (CNVs) of the KITLG gene seem to be involved in the oncogenesis of digital squamous cell carcinoma (dSCC). The aims of this study were (1) to investigate KITLG CNV in giant (GS), standard (SS), and miniature (MS) schnauzers and (2) to compare KITLG CNV between black GS with and without dSCC. Blood samples from black GS (22 with and 17 without dSCC), black SS (18 with and 4 without dSSC; 5 unknown), and 50 MS (unknown dSSC status and coat colour) were analysed by digital droplet PCR. The results are that (1) most dogs had a copy number (CN) value > 4 (range 2.5–7.6) with no significant differences between GS, SS, and MS, and (2) the CN value in black GS with dSCC was significantly higher than in those without dSCC (p = 0.02). CN values > 5.8 indicate a significantly increased risk for dSCC, while CN values < 4.7 suggest a reduced risk for dSCC (grey area: 4.7–5.8). Diagnostic testing for KITLG CNV may sensitise owners to the individual risk of their black GS for dSCC. Further studies should investigate the relevance of KITLG CNV in SS and the protective effects in MS, who rarely suffer from dSCC.
Formic acid is the main component of the ant’s major weapon against enemies. Being mainly used as a chemical defense, the acid is also exploited for recruitment and trail marking. The repelling effect of the organic acid is used by some mammals and birds which rub themselves in the acid to eliminate ectoparasites. Beekeepers across the world rely on this effect to control the parasitic mite Varroa destructor. Varroa mites are considered the most destructive pest of honey bees worldwide and can lead to the loss of entire colonies. Formic acid is highly effective against Varroa mites but can also kill the honeybee queen and worker brood. Whether formic acid can also affect the behavior of honey bees is unknown. We here study the effect of formic acid on sucrose responsiveness and cognition of honey bees treated at different live stages in field-relevant doses. Both behaviors are essential for survival of the honey bee colony. Rather unexpectedly, formic acid clearly improved the learning performance of the bees in appetitive olfactory conditioning, while not affecting sucrose responsiveness. This exciting side effect of formic acid certainly deserves further detailed investigations.
Patienten mit NNI haben ein erhöhtes Risiko potenziell lebensbedrohliche NN- Krisen zu erleiden. Zur Verbesserung der Präventionsmaßnahmen untersuchte unsere Studie das pharmakokinetische Profil kommerziell verfügbarer Prednison- Suppositorien nach vaginaler und rektaler Applikation in weiblichen Patienten mit primärer NNI. Zwischen der rektalen und vaginalen Gabe von 100 mg Prednison ließ sich keine Bioäquivalenz nachweisen. Die AUC0-360 und die maximalen Prednisolon-Spiegel im Serum waren nach vaginaler Gabe signifikant niedriger. In fünf Patientinnen war kein Wirkstoffspiegel innerhalb von sechs Stunden nachweisbar. Darüber hinaus war der Abfall der ACTH-Spiegel, als indirekter Wirknachweis, nach vaginaler Gabe signifikant geringer. UEs traten nach vaginaler Gabe gehäuft auf und waren vor allem auf verminderte Resorption und damit einhergehendem Mangel an Glukokortikoiden zurückzuführen. Aufgrund der in dieser Studie erhobenen Daten wird eine vaginale Gabe von Rectodelt® zur Prävention und Therapie von NN-Krisen nicht empfohlen. Erklärungsansätze für diese verminderte Resorption nach vaginaler Gabe könnten das Fehlen eines vaginalen Verschlussmuskels, aber auch die galenische Formulierung mit einem hohen Hartfettanteil des Suppositoriums sein. Da nach vaginaler Verabreichung von diversen Medikamenten, z.B. Misoprostol, relevante Arzneimittelspiegel erzielt worden sind, ist eine Resorption über vaginales Epithel nicht generell ausgeschlossen.
Nach rektaler Gabe von Prednison konnten relevante Wirkspiegel erzielt werden. In einer Subanalyse wurden die ACTH-Spiegel nach Gabe von 100 mg Prednison-Suppositorien mit jenen nach Injektion von 100 mg Hydrokortison verglichen. Der minimale ACTH-Spiegel war nach rektaler Applikation jedoch deutlich höher als nach s. c. oder i. m. Injektion von Hydrokortison. Diese Ergebnisse korrelieren auch mit den gemessenen Prednisolon-Spiegeln nach rektaler Gabe. Die höhere glukokortikoide Potenz von Prednison wiegt nicht die langsamere Kinetik nach rektaler Applikation auf. Ferner besitzt Prednison eine niedrigere mineralkortikoide Potenz als Hydrokortison, was einen weiteren Nachteil darstellen könnte, da die Aktivierung des Mineralkortikoid-Rezeptors im Falle einer NN-Krisen-assoziierten Hypotension als wichtig erachtet wird.
Anhand der erhobenen Daten scheint die Injektion (i. m. oder s. c.) von Hydrokortison zur Prävention von NN-Krisen der rektalen Verabreichung von Prednison-Suppositorien deutlich überlegen. Prednison wird zunächst durch die 11ß-Hydroxysterid-Dehydrogenase Typ 1 in Prednisolon umgewandelt. Es wird vermutet, dass glukokortikoide Effekte nach Verabreichung eines Prednisolon- Suppositoriums schneller eintreten bzw. ACTH-Spiegel schneller supprimiert werden. Dies muss in weiteren Studien näher erörtert werden. Ebenso ist denkbar, dass eine höhere Prednison-Dosis bei Suppositorien-Gebrauch eine schnellere Pharmakokinetik besitzt.
Obwohl im Untersuchungszeitraum ausreichende Prednisolon-Konzentrationen nach rektaler Gabe beobachtet wurden, kann die rektale Applikation nicht als äquivalent zur parenteralen Gabe von Glukokortikoiden angesehen werden. Auf dieser Datengrundlage sollte die Injektion von Glukokortikoiden als Mittel der ersten Wahl zur Prävention oder Therapie von NN-Krisen empfohlen werden, bis adäquate medizinische Therapie gewährleistet ist. Die Überlegenheit von parenteralen Glukokortikoiden hält jedoch nur stand, wenn eine gleiche Akzeptanz der Patienten garantiert ist und die Behandlung im gleichen Zeitintervall erfolgt. Die Mehrzahl der untersuchten Patientinnen fürchtet weiterhin eine eigenständige Injektion, welche die Verabreichung verzögern kann und eine potenzielle Gefährdung darstellt. Eine patientenfreundliche ready-to- use Hydrokortison-Injektionsspritze ist weiterhin nicht verfügbar. Zusammenfassend lässt sich sagen, dass die vaginale Verabreichung von Prednison-Suppositorien, in der untersuchten galenischen Formulierung, zwar deutlich einfacher und ohne spezielle Schulung machbar ist, aber zur Prävention oder Behandlung von NN-Krisen nicht ausreicht. Generell sollte die parenterale Injektion von Hydrokortison als erste Wahl zur Prävention von NN-Krisen empfohlen werden, wobei neben regelmäßiger Schulung der Fokus zukünftig auf eine Vereinfachung der Injektion gelegt werden sollte.
Die Anzahl an Fahrradfahrern steigt in allen Altersgruppen. Mit zunehmender Popularität erhöht sich die Anzahl an Unfällen mit zum Teil schweren Verletzungen. Im Zuge dessen stellt sich die Frage, welchen Einfluss das Alter auf die Art und Schwere der Verletzungen, die Überlebenswahrscheinlichkeit und die Krankenhausverweildauer bei schwerverletzten Fahrradfahrern hat.
Methoden: Es wurde eine retrospektive Auswertung der Daten des TraumaRegisters DGU® der Jahre 2010-2019 durchgeführt. Alle schwerverletzten Fahrradfahrer mit einem MAIS 3+ (N=14.651) im TR-DGU wurden in diese Studie eingeschlossen und die vorliegenden Parameter ausgewertet. Es erfolgte eine Unterteilung in vier Altersgruppen (20 - 59, 60 - 69, 70 - 79 und ≥ 80 Jahre).
Ergebnisse: Verletzungen des Schädels traten mit 64,2% mit Abstand am häufigsten auf. Es zeigte sich eine deutliche Zunahme der schweren Kopfverletzungen in der Gruppe der über 60-Jährigen. Mit steigendem Alter nahm des Weiteren die Wahrscheinlichkeit einer präklinischen Intubation, die Katecholaminpflichtigkeit, die Intensiv- und Krankenhausverweildauer sowie die Sterblichkeit zu.
Schlussfolgerung: Kopfverletzungen stellen die häufigste schwere Verletzung bei Fahrradfahrern dar. Da das Helmtragen nicht erfasst wird kann auf dessen Effektivität kein Rückschluss gezogen werden. Ein höheres Alter korreliert des Weiteren mit einer höheren Sterblichkeit, stellt jedoch keinen unabhängigen Risikofaktor zum Versterben bei einem schwerverletzten Patienten dar.
Parkinson’s disease (PD) is the second most common neurodegenerative disease with still no cure available. The prominent feature of PD is the loss of dopaminergic neurons at the Substantia nigra (SN). Genetic and environmental insults affecting the SNCA gene encoding the alpha-Synuclein (alpha-Syn) protein result into an aberrant form of the protein with higher propensity towards oligomerization becoming part of insoluble inclusions called Lewy Bodies (LB). LB impart cytotoxicity leading to neurodegeneration, activate resident microglia and escape to the periphery where they get captured by dendritic cells and presented to naïve T cells. Proliferating effector T lymphocytes invade the brain releasing proinflammatory cytokines and performing a cytotoxic effect on neurons.
In this study, we examine the hypothesis that the expansion of regulatory T cells (Treg) could exert an anti-inflammatory effect that averts neurodegeneration in the AAV1/2-A53T-alpha-Syn mouse model for PD.
Mice brains were transfected by a unilateral stereotaxic injection at the SN region with a chimeric Adeno-Associated Viral vector of serotypes 1 and 2 (AAV1/2) carrying the A53T-mutated human SNCA gene encoding the readily aggregating aberrant alpha-Syn (AAV1/2-A53T-alpha-Syn). One week after injection, mice were treated with the CD28 superagonistic antibody (CD28SA), known to significantly expand the Treg population. Mice were then analyzed by behavioral analysis using the Rotarod performance test and the Cylinder test. The impact of CD28SA on the immune system was examined by flow cytometry. The integrity of the nigrostriatal system was assessed by stereological quantification of Tyrosine hydroxylase (TH)-stained dopaminergic neurons in SN and optical density measurements of TH-stained striatum. The mechanism of action of CD28SA was analyzed by treating PD mice alternatively with a Treg adoptive transfer, while CD28SA effect on levels of neurotrophic factors was quantified by ELISA.
We observed an expansion of Treg by FACS analyses three days after CD28SA treatment, demonstrating target engagement. CD28SA treatment of AAV1/2-A53T-alpha-Syn mice provided neuroprotection evident through elevated numbers of dopaminergic neurons in the SN and higher optical density of TH-staining in the striatum, in CD28SA-treated mice compared to PBS-treated control mice, and that was reflected in an enhanced performance in behavioral studies. Additionally, brain infiltration of proinflammatory activated T lymphocytes (CD4+CD69+ and CD8+CD69+ cells), that were obvious in PBS-treated AAV1/2-A53T-alpha-Syn control mice, was augmented in PD mice receiving CD28SA. The alternative treatment with Treg adoptive transfer did replicate the beneficial effects of CD28SA indicating that Treg expansion is the main effector mechanism by which it exerts its neuroprotective effect. CD28SA treatment of PD mice led to an increase of GDNF and BDNF in some brain structures that was not observed in untreated mice.
We conclude that in the AAV1/2-A53T-alpha-Syn PD mouse model, CD28SA suppresses proinflammation, reverses behavioral deficits and is neuroprotective on SN dopaminergic cells.
Die Auswirkungen der chirurgischen und konservativen Adipositastherapie auf das Metabolom sind bisher nicht eindeutig geklärt. Der Veränderung bestimmter Metaboliten, darunter den verzweigtkettigen Aminosäuren (BCAA) und den langkettigen Phosphatidylcholinen (PC) bzw. Lecithinen, wird eine tragende Rolle im Zucker- und Fettstoffwechsel zugesprochen. Eine Erhebung von metabolomischen Profilen und deren funktionelle Aufteilung in Aminosäuren- und Lipidprofile bietet eine neue Möglichkeit zur Charakterisierung des Stoffwechsels. Im Vergleich zu der konservativen Therapie wurde nach der RYGB Operation ein signifikanter Anstieg der Lecithine sowie ein signifikanter Abfall der BCAA festgestellt, welche als mögliche Biomarker des Zucker- und Fettstoffwechsels gezeigt wurden. In Zusammenschau der Ergebnisse kann angenommen werden, dass die chirurgische Therapie der konservativen Therapie, wie sie in der WAS durchgeführt wurde, im Hinblick auf den Gewichtsverlust und die Verbesserung des Zucker- und Fettstoffwechsels überlegen ist. Die Erhebung des Metaboloms bietet eine neue Möglichkeit Unterschiede im Stoffwechsel nach Adipositastherapie abzubilden und Metaboliten zu identifizieren, welche mit dem Zucker- und Fettstoffwechsel assoziiert sind.
Although bariatric surgery is known to change the metabolome, it is unclear if this is specific for the intervention or a consequence of the induced bodyweight loss. As the weight loss after Roux-en-Y Gastric Bypass (RYGB) can hardly be mimicked with an evenly effective diet in humans, translational research efforts might be helpful. A group of 188 plasma metabolites of 46 patients from the randomized controlled Würzburg Adipositas Study (WAS) and from RYGB-treated rats (n = 6) as well as body-weight-matched controls (n = 7) were measured using liquid chromatography tandem mass spectrometry. WAS participants were randomized into intensive lifestyle modification (LS, n = 24) or RYGB (OP, n = 22). In patients in the WAS cohort, only bariatric surgery achieved a sustained weight loss (BMI −34.3% (OP) vs. −1.2% (LS), p ≤ 0.01). An explicit shift in the metabolomic profile was found in 57 metabolites in the human cohort and in 62 metabolites in the rodent model. Significantly higher levels of sphingolipids and lecithins were detected in both surgical groups but not in the conservatively treated human and animal groups. RYGB leads to a characteristic metabolomic profile, which differs distinctly from that following non-surgical intervention. Analysis of the human and rat data revealed that RYGB induces specific changes in the metabolome independent of weight loss.
Explaining the baryon asymmetry of the Universe has been a long-standing problem of particle physics, with the consensus being that new physics is required as the Standard Model (SM) cannot resolve this issue. Beyond the Standard Model (BSM) scenarios would need to incorporate new sources of \(CP\) violation and either introduce new departures from thermal equilibrium or modify the existing electroweak phase transition. In this thesis, we explore two approaches to baryogenesis, i.e. the generation of this asymmetry.
In the first approach, we study the two-particle irreducible (2PI) formalism as a means to investigate non-equilibrium phenomena. After arriving at the renormalised equations of motions (EOMs) to describe the dynamics of a phase transition, we discuss the techniques required to obtain the various counterterms in an on-shell scheme. To this end, we consider three truncations up to two-loop order of the 2PI effective action: the Hartree approximation, the scalar sunset approximation and the fermionic sunset approximation. We then reconsider the renormalisation procedure in an \(\overline{\text{MS}}\) scheme to evaluate the 2PI effective potential for the aforementioned truncations. In the Hartree and the scalar sunset approximations, we obtain analytic expressions for the various counterterms and subsequently calculate the effective potential by piecing together the finite contributions. For the fermionic sunset approximation, we obtain similar equations for the counterterms in terms of divergent parts of loop integrals. However, these integrals cannot be expressed in an analytic form, making it impossible to evaluate the 2PI effective potential with the fermionic contribution. Our main results are thus related to the renormalisation programme in the 2PI formalism: \( (i) \)the procedure to obtain the renormalised EOMs, now including fermions, which serve as the starting point for the transport equations for electroweak baryogenesis and \( (ii) \) the method to obtain the 2PI effective potential in a transparent manner.
In the second approach, we study baryogenesis via leptogenesis. Here, an asymmetry in the lepton sector is generated, which is then converted into the baryon asymmetry via the sphaleron process in the SM. We proceed to consider an extension of the SM along the lines of a scotogenic framework. The newly introduced particles are charged odd under a \(\mathbb{Z}_2\) symmetry, and masses for the SM neutrinos are generated radiatively. The \(\mathbb{Z}_2\) symmetry results in the lightest BSM particle being stable, allowing for a suitable dark matter (DM) candidate. Furthermore, the newly introduced heavy Majorana fermionic singlets provide the necessary sources of \(CP\) violation through their Yukawa interactions and their out-of-equilibrium decays produce a lepton asymmetry. This model is constrained from a wide range of observables, such as consistency with neutrino oscillation data, limits on branching ratios of charged lepton flavour violating decays, electroweak observables and obtaining the observed DM relic density. We study leptogenesis in this model in light of the results of a Markov chain Monte Carlo scan, implemented in consideration of the aforementioned constraints. Successful leptogenesis in this model, to account for the baryon asymmetry, then severely constrains the available parameter space.
The aim of this research was to characterize cognitive abilities in patients with Glut1-Deficiency syndrome (Glut1DS) following ketogenic diet therapy (KDT). Methods: The cognitive profiles of eight children were assessed using the Wechsler Intelligence Scale (WISC-IV). The effect of ketogenic diet therapy (KDT) on individual subareas of intelligence was analyzed considering the potential influence of speech motor impairments. Results: Patients with Glut1DS showed a wide range of cognitive performance levels. Some participants showed statistically and clinically significant discrepancies between individual subdomains of intelligence. Both variables, KDT initiation as well as duration, had a positive effect on the overall IQ score. Significant correlations were partially found between the time of KDT initiation and the level of IQ scores, depending on the presence of expressive language test demands of the respective subtests of the WISC-IV. Accordingly, the participants benefited les in the linguistic cognitive domain. The discrepancies in cognitive performance profiles of patients with Glut1DS can be attributed to the possibility of a negative distortion of the results due to the influence of speech motor impairments. Conclusions: The individual access skills of test persons should be more strongly considered in test procedures for the assessment of intelligence to reduce the negative influence of motor deficits on test performance. Specific characterization and systematization of the speech disorder are indispensable for determining the severity of speech motor impairment in Glut1DS. Therefore, a stronger focus on dysarthria during diagnosis and therapy is necessary.
Salivary gland tumors (SGTs) are a relevant, highly diverse subgroup of head and neck tumors whose entity determination can be difficult. Confocal Raman imaging in combination with multivariate data analysis may possibly support their correct classification. For the analysis of the translational potential of Raman imaging in SGT determination, a multi-stage evaluation process is necessary. By measuring a sample set of Warthin tumor, pleomorphic adenoma and non-tumor salivary gland tissue, Raman data were obtained and a thorough Raman band analysis was performed. This evaluation revealed highly overlapping Raman patterns with only minor spectral differences. Consequently, a principal component analysis (PCA) was calculated and further combined with a discriminant analysis (DA) to enable the best possible distinction. The PCA-DA model was characterized by accuracy, sensitivity, selectivity and precision values above 90% and validated by predicting model-unknown Raman spectra, of which 93% were classified correctly. Thus, we state our PCA-DA to be suitable for parotid tumor and non-salivary salivary gland tissue discrimination and prediction. For evaluation of the translational potential, further validation steps are necessary.
The collection at hand is concerned with learning curve effects in hospitals as highly specialized expert organizations and comprises four papers, each focusing on a different aspect of the topic. Three papers are concerned with surgeons, and one is concerned with the staff of the emergency room in a conservative treatment.
The preface compactly addresses the steadily increasing health care costs and economic pressure, the hospital landscape in Germany as well as its development. Furthermore, the DRG lump-sum compensation and the characteristics of the health sector, which is strongly regulated by the state and in which ethical aspects must be omnipresent, are outlined. Besides, the benefit of knowing about learning curve effects in order to cut costs and to keep quality stable or even improve it, is addressed.
The first paper of the collection investigates the learning effects in a hospital which has specialized on endoprosthetics (total hip and knee replacement). Doing so, the specialized as well as the non-specialized interventions are studied. Costs are not investigated directly, but cost indicators. The indicator of costs in the short term are operating room times. The one of medium- to long-term costs is quality. It is operationalized by complications in the post-anesthesia care unit. The study estimates regression models (OLS and logit). The results indicate that the specialization comes along with advantages due to learning effects in terms of shorter operating room times and lower complication rates in endoprosthetic interventions. For the non-specialized interventions, the results are the same. There are no possibly negative effects of specialization on non-specialized surgeries, but advantageous spillover effects. Altogether, the specialization can be regarded as reasonable, as it cuts costs of all surgeries in the short, medium, and long term. The authors are Carsten Bauer, Nele Möbs, Oliver Unger, Andrea Szczesny, and Christian Ernst.
In the second paper surgeons’ learning curves effects in a teamwork vs. an individual work setting are in the focus of interest. Thus, the study combines learning curve effects with teamwork in health care, an issue increasingly discussed in recent literature. The investigated interventions are tonsillectomies (surgical excision of the palatine tonsils), a standard intervention. The indicator of costs in the short and medium to long term are again operating room times and complications as a proxy for quality respectively. Complications are secondary bleedings, which usually occur a few days after surgery. The study estimates regression models (OLS and logit). The results show that operating room times decrease with increasing surgeon’s experience. Surgeons who also operate in teams learn faster than the ones always operating on their own. Thus, operating room times are shorter for surgeons who also take part in team interventions. As a special feature, the data set contains the costs per case. This enables assuring that the assumed cost indicators are valid. The findings recommend team surgeries especially for resident physicians. The authors are Carsten Bauer, Oliver Unger, and Martin Holderried.
The third paper is dedicated to stapes surgery, a therapy for conductive hearing loss caused by otosclerosis (overflow bone growth). It is conceptually simple, but technically difficult. Therefore, it is regarded as the optimum to study learning curve effects in surgery. The paper seeks a comprehensive investigation. Thus, operating room times are employed as short-term cost indicator and quality as the medium to long term one. To measure quality, the postoperative difference between air and bone conduction threshold as well as a combination of this difference and the absence of complications. This paper also estimates different regression models (OLS and logit). Besides investigating the effects on department level, the study also considers the individual level, this means operating room times and quality are investigated for individual surgeons. This improves the comparison of learning curves, as the surgeons worked under widely identical conditions. It becomes apparent that the operating room times initially decrease with increasing experience. The marginal effect of additional experience gets smaller until the direction of the effect changes and the operating room times increase with increasing experience, probably caused by the allocation of difficult cases to the most experienced surgeons. Regarding quality, no learning curve effects are observed. The authors are Carsten Bauer, Johannes Taeger, and Kristen Rak.
The fourth paper is a systematic literature review on learning effects in the treatment of ischemic strokes. In case of stroke, every minute counts. Therefore, there is the inherent need to reduce the time from symptom onset to treatment. The article is concerned with the reduction of the time from arrival at the hospital to thrombolysis treatment, the so-called “door-to-needle time”. In the literature, there are studies on learning in a broader sense caused by a quality improvement program as well as learning in a narrower sense, in which learning curve effects are evaluated. Besides, studies on the time differences between low-volume and high-volume hospitals are considered, as the differences are probably the result of learning and economies of scale. Virtually all the 165 evaluated articles report improvements regarding the time to treatment. Furthermore, the clinical results substantiate the common association of shorter times from arrival to treatment with improved clinical outcomes. The review additionally discusses the economic implications of the results. The author is Carsten Bauer.
The preface brings forward that after the measurement of learning curve effects, further efforts are necessary for using them in order to increase efficiency, as the issue does not admit of easy, standardized solutions. Furthermore, the postface emphasizes the importance of multiperspectivity in research for the patient outcome, the health care system, and society.
In this thesis, the usage of onion-like carbon (OLC) for energy storage applications was researched regarding sustainability, performance and processability. This work targets to increase the scientific understanding regarding the role of OLC in electrodes and to facilitate a large-scale production, which is the foundation for commercial application. Research was devoted to increase the knowledge in the particular field, to yield synergistic approaches and a shared value regarding sustainability and performance.
Für die Steinartefakte der ältesten Linearbandkeramik (LBK) liegen bisher kaum mikrofossile oder chemische Analysen zur Herkunftsbestimmung der Rohmaterialien vor, was das Bild der Rohmaterialversorgung auf einem sehr allgemeinen Niveau hält. Es werden die Rohmaterialanalysen des Inventars Langenbach-Niederhummel, Lkr. Freising, Obb., vorgestellt und mit dem bisherigen Forschungsstand diskutiert. Es zeigt sich die intensive Anbindung an das Revier des Ortenburger Raumes, was die Bedeutung der Isar als Verbindungsweg unterstreicht. Aufgrund der technologischen Analyse des Inventars ist von einer Produktion innerhalb der Siedlung auszugehen, was auf eine Selbstversorgung der Siedlung schließen lässt. Dies betont, dass sich die Siedlung in einer eher isolierten Position befand und es noch kein etabliertes Weitergabenetzwerk für Austauschprozesse gab. Mehrere Rohmaterialtypen weisen über das Verbreitungsgebiet der ältesten Linearbandkeramik hinaus. Vor allem die angezeigten transalpinen Verbindungen lassen sich durch weitere Beispiele in einen räumlichen und zeitlichen Kontext setzen. Die Ergebnisse bestätigen eine Kontinuität dieser Routen seit dem Mesolithikum, die sich nach der Linearbandkeramik auch in späteren neolithischen Phasen abzeichnen. Vor dem Hintergrund dieser Ergebnisse stellt sich die Frage nach dem Mobilitätsfaktor, der ursächlich für solche Rohmaterialbezüge ist.
No abstract available.
Two-dimensional (2D) topological insulators are a new class of materials with properties that are
promising for potential future applications in quantum computers. For example, stanene represents
a possible candidate for a topological insulator made of Sn atoms arranged in a hexagonal
lattice. However, it has a relatively fragile low-energy spectrum and sensitive topology. Therefore,
to experimentally realize stanene in the topologically non-trivial phase, a suitable substrate
that accommodates stanene without compromising these topological properties must be found.
A heterostructure consisting of a SiC substrate with a buffer layer of adsorbed group-III elements
constitutes a possible solution for this problem. In this work, 2D adatom systems of Al and In
were grown epitaxially on SiC(0001) and then investigated structurally and spectroscopically by
scanning tunneling microscopy (STM) and photoelectron spectroscopy.
Al films in the high coverage regime \( (\Theta_{ML}\approx2\) ML\( ) \) exhibit unusually large, triangular- and
rectangular-shaped surface unit cells. Here, the low-energy electron diffraction (LEED)
pattern is brought into accordance with the surface topography derived from STM. Another Al
reconstruction, the quasi-one-dimensional (1D) Al phase, exhibits a striped surface corrugation,
which could be the result of the strain imprinted by the overlayer-substrate lattice mismatch.
It is suggested that Al atoms in different surface areas can occupy hexagonal close-packed and
face-centered cubic lattice sites, respectively, which in turn lead to close-packed transition regions
forming the stripe-like corrugations. On the basis of the well-known herringbone reconstruction
from Au(111), a first structural model is proposed, which fits well to the structural data from
STM. Ultimately, however, thermal treatments of the sample could not generate lower coverage
phases, i.e. in particular, a buffer layer structure.
Strong metallic signatures are found for In high coverage films \( (\Theta_{ML}\approx3\) to \(2\) ML\() \) by
scanning tunneling spectroscopy (STS) and angle-resolved photoelectron spectroscopy (ARPES),
which form a \( (7\times7) \), \( (6\times4\sqrt{3}) \), and \( (4\sqrt{3}\times4\sqrt{3}) \) surface reconstruction. In all these In phases
electrons follow the nearly-free electron model. Similar to the Al films, thermal treatments could
not obtain the buffer layer system.
Surprisingly, in the course of this investigation a triangular In lattice featuring a \( (1\times1) \)
periodicity is observed to host massive Dirac-like bands at \( K/K^{\prime} \) in ARPES. Based on this
strong electronic similarity with graphene at the Brillouin zone boundary, this new structure is
referred to as \textit{indenene}. An extensive theoretical analysis uncovers the emergence of an electronic
honeycomb network based on triangularly arranged In \textit{p} orbitals. Due to strong atomic spin-orbit
coupling and a comparably small substrate-induced in-plane inversion symmetry breaking this
material system is rendered topologically non-trivial. In indenene, the topology is intimately
linked to a bulk observable, i.e., the energy-dependent charge accumulation sequence within the
surface unit cell, which is experimentally exploited in STS to confirm the non-trivial topological
character. The band gap at \( K/K^{\prime} \), a signature of massive Dirac fermions, is estimated by
ARPES to approximately 125 meV. Further investigations by X-ray standing wave, STM, and
LEED confirm the structural properties of indenene. Thus, this thesis presents the growth and
characterization of the novel quantum spin Hall insulator material indenene.
The platelet cytoskeleton ensures normal size and discoid shape under resting conditions and undergoes immediate reorganization in response to changes in the extracellular environment through integrin-based adhesion sites, resulting in actomyosin-mediated contractile forces. Mutations in the contractile protein non-muscle myosin heavy chain IIA display, among others, macrothrombocytopenia and a mild to moderate bleeding tendency in human patients. It is insufficiently understood which factors contribute to the hemostatic defect found in MYH9-related disease patients. Therefore, a better understanding of the underlying biophysical mechanisms in thrombus formation and stabilization is warranted.
This thesis demonstrates that an amino acid exchange at the positions 702, 1424 and 1841 in the heavy chain of the contractile protein non-muscle myosin IIA, caused by heterozygous point mutations in the gene, resulted in macrothrombocytopenia and increased bleeding in mice, reflecting the clinical hallmark of the MYH9-related disease in human patients. Basic characterization of biological functions of Myh9 mutant platelets revealed overall normal surface glycoprotein expression and agonist-induced activation when compared to wildtype platelets. However, myosin light chain phosphorylation after thrombin-activation was reduced in mutant platelets, resulting in less contractile forces and a defect in clot retraction. Altered biophysical characteristics with lower adhesion and interaction forces of Myh9 mutant platelets led to reduced thrombus formation and stability. Platelets from patients with the respective mutations recapitulated the findings obtained with murine platelets, such as impaired thrombus formation and stiffness.
Besides biological and biophysical characterization of mutant platelets from mice and men, treatment options were investigated to prevent increased bleeding caused by reduced platelet forces. The antifibrinolytic agent tranexamic acid was applied to stabilize less compact thrombi, which are presumably more vulnerable to fibrinolysis. The hemostatic function in Myh9 mutant mice was improved by interfering with the fibrinolytic system. These results show the beneficial effect of fibrin stabilization to reduce bleeding in MYH9-related disease.
This thesis is aimed at establishing modalities of time-resolved photoelectron spectroscopy (tr-PES) conducted at a free-electron laser (FEL) source and at a high harmonic generation (HHG) source for imaging the motion of atoms, charge and energy at photoexcited hybrid organic/inorganic interfaces. Transfer of charge and energy across interfaces lies at the heart of surface science and device physics and involves a complex interplay between the motion of electrons and atoms. At hybrid organic/inorganic interfaces involving planar molecules, such as pentacene and copper(II)-phthalocyanine (CuPc), atomic motions in out-of-plane direction are particularly apparent. Such hybrid interfaces are of importance to, e.g., next-generation functional devices, smart catalytic surfaces and molecular machines. In this work, two hybrid interfaces – pentacene atop Ag(110) and copper(II)-phthalocyanine (CuPc) atop titanium disulfide (1T-TiSe2) – are characterized by means of modalities of tr-PES. The experiments were conducted at a HHG source and at the FEL source FLASH at Deutsches Elektronen-Synchrotron DESY (Hamburg, Germany). Both sources provide photon pulses with temporal widths of ∼ 100 fs and thus allow for resolving the non-equilibrium dynamics at hybrid interfaces involving both electronic and atomic motion on their intrinsic time scales. While the photon energy at this HHG source is limited to the UV-range, photon energies can be tuned from the UV-range to the soft x-ray-range at FLASH. With this increased energy range, not only macroscopic electronic information can be accessed from the sample’s valence and conduction states, but also site-specific structural and chemical information encoded in the core-level signatures becomes accessible. Here, the combined information from the valence band and core-level dynamics is obtained by performing time- and angle-resolved photoelectron spectroscopy (tr-ARPES) in the UV-range and subsequently performing time-resolved x-ray photoelectron spectroscopy (tr-XPS) and time-resolved photoelectron diffraction (tr-XPD) in the soft x-ray regime in the same experimental setup. The sample’s bandstructure in energy-momentum space and time is captured by a time-of-flight momentum microscope with femtosecond temporal and sub-Ångström spatial resolutions. In the investigated systems, out-of-equilibrium dynamics are traced that are connected to the transfer of charge and energy across the hybrid interfaces. While energetic shifts and complementary population dynamics are observed for molecular and substrate states, the shapes of involved molecular orbitals change in energy-momentum space on a subpicosecond time scale. In combination with theory support, these changes are attributed to iiiatomic reorganizations at the interface and transient molecular structures are reconstructed with sub-Ångström precision. Unique to the material combination of CuPc/TiSe2, a structural rearrangement on the macroscopic scale is traced simultaneously: ∼ 60 % of the molecules undergo a concerted, unidirectional in-plane rotation. This surprising observation and its origin are detailed in this thesis and connected to a particularly efficient charge transfer across the CuPc/TiSe2 interface, resulting in a charging of ∼ 45 % of CuPc molecules.
Neural processing of a desired moving direction requires the continuous comparison between the current heading and the goal direction. While the neural basis underlying the current heading is well-studied, the coding of the goal direction remains unclear in insects. Here, we used tetrode recordings in tethered flying monarch butterflies to unravel how a goal direction is represented in the insect brain. While recording, the butterflies maintained robust goal directions relative to a virtual sun. By resetting their goal directions, we found neurons whose spatial tuning was tightly linked to the goal directions. Importantly, their tuning was unaffected when the butterflies changed their heading after compass perturbations, showing that these neurons specifically encode the goal direction. Overall, we here discovered invertebrate goal-direction neurons that share functional similarities to goal-direction cells reported in mammals. Our results give insights into the evolutionarily conserved principles of goal-directed spatial orientation in animals.
Im Zuge des technischen Fortschritts ist das hochautomatisierte Fahren nach SAE Level 3 (SAE, 2018) in
den vergangenen Jahren in greifbare Nähe gerückt. Es ist damit zu rechnen, dass Fahrzeuge in naher Zukunft zumindest bei Vorliegen einer Reihe strikter Rahmenbedingungen den Fahrer phasenweise von der Fahraufgabe entbinden können. Letzterer muss die Fahrzeugautomation während dieser Phasen nicht überwa
chen und kann sich anderen Tätigkeiten zuwenden. An Systemgrenzen oder bei Systemfehlern (Gold,
Naujoks, Radlmayr, Bellem & Jarosch, 2017) stellt er jedoch die Rückfallebene dar und muss die Fahrzeugkontrolle innerhalb eines angemessenen Zeitraumes übernehmen, sobald ihn das Fahrzeug dazu auffordert. Diese Rückübertragung der Fahraufgabe an den Fahrer stellt ein kritisches Nadelöhr für die Sicherheit und Akzeptanz automatisierter Fahrsysteme dar. Aus psychologischer Perspektive handelt es sich hierbei um Aufgabenwechsel. Diese gehen in Experimenten der kognitiven und angewandten Psychologie zuverlässig mit Kosten einher, welche sich in verlängerten Reaktionszeiten und erhöhten Fehlerraten bei der Aufgabenbearbeitung niederschlagen. Insbesondere im Bereich des automatisierten Fahrens liegen zahlreiche Belege vor, dass der Wechsel zwischen automatisiertem und manuellem Fahren zu einer Verschlechterung der Fahrleistungen gegenüber dem manuellen Fahren führen kann.
Die vorliegende Arbeit beschäftigt sich mit diesen Übergängen und fokussiert dabei die Tätigkeiten, denen Fahrer während der hochautomatisierten Fahrabschnitte nachgehen können. Vier Experimente im Fahrsimulator betrachten die Auswirkungen unterschiedlicher Aspekte fahrfremder Tätigkeiten (FFT) in Übernahmesituationen sowie deren Zusammenwirken mit unterschiedlichen Übernahmeaufforderungen.
Im ersten Experiment wird zunächst der Frage nachgegangen, inwiefern sich die Vielzahl denkbarer und zu erwartender FFT durch übergeordnete und damit systematisch untersuchbare Merkmale auszeichnet und
welche dies gegebenenfalls sind. Im zweiten Experiment werden anschließend die relevantesten Merkmale,
Unterbrechungsaufwand und Anreiz zur Weiterbearbeitung der Aufgabe daraufhin untersucht, welchen Ein-
fluss sie auf Fahrerleistungen in Übernahmesituationen ausüben. Im dritten Experiment wird der Frage nachgegangen, welches Potenzial solche Übernahmeaufforderungen besitzen, deren Dringlichkeit adaptiv
ist hinsichtlich des jeweiligen Aufwandes der Aufgabenunterbrechung sowie des jeweiligen Anreizes zur
Weiterbearbeitung der Aufgabe. Im vierten Experiment wird ein Übernahmekonzept untersucht, bei dem der Zeitpunkt der Übernahmeaufforderung adaptiv ist hinsichtlich des jeweiligen Aufwandes der Aufgaben-
unterbrechung. Die vorliegende Arbeit kann mit dem Unterbrechungsaufwand und dem Bearbeitungsanreiz zwei in L3-Übernahmesituationen wesentliche Merkmale fahrfremder Tätigkeiten identifizieren (Studien 1 und 2). Darüber hinaus wird eine experimentelle Variation des Unterbrechungsaufwandes erbracht und deren Effekte abgebildet (Studie 2). Durch den Vergleich adaptiver und nicht adaptiver Transitionskonzepte werden die Vorteile von Adaptivität im Rahmen von L3-Übernahmesituationen experimentell herausgearbeitet (Studien 3 und 4).
In dieser Arbeit wurde die Krankheitsprogression im Parkinson-Mausmodell hm2α-SYN-39 mit zunehmendem Alter charakterisiert. Die Mäuse wurden in 4 Altersgruppen (2-3, 7-8, 11-12, 16-17 Monate) mit motorischen Verhaltenstests auf einen Parkinson-Phänotyp untersucht. Zudem erfolgten Untersuchungen des dopaminergen Systems zur Detektion von neurochemischen Veränderungen und einer Neurodegeneration im nigrostriatalen Trakt. Weiterhin wurden neuroinflammatorische Prozesse des adaptiven und angeborenen IS in der SN und im Striatum mittels immunhistochemischer Färbungen beurteilt.
Ein Parkinson-Phänotyp in diesem Mausmodell zeigte sich nur leicht ausgeprägt, sodass der Rotarod- und Zylinder-Test lediglich den Hinweis auf eine nicht-signifikante Einschränkung der Motorik erbrachte. Dennoch ergab die stereologische Quantifizierung TH- und Nissl-positiver Zellen in der SNpc der hm2α-SYN-39 Mäuse eine altersabhängige, signifikant-progrediente Reduktion der dopaminergen Neurone mit zunehmendem Alter. Eine signifikant niedrigere TH-positive Zellzahl dieser tg Mäuse zeigte sich ab einem Alter von 16-17 Monaten verglichen zu gleichaltrigen wt Tieren. Dagegen war die Neurodegeneration im Striatum etwas weniger ausgeprägt. Die tg Mäuse präsentierten im Alter von 16-17 Monaten eine nicht-signifikante Erniedrigung der dopaminergen Terminalen verglichen zu gleichaltrigen wt Tieren. Ein DA-Mangel im Striatum der tg Mäuse konnte mittels HPLC bestätigt werden. Bis zum Alter von 16-17 Monaten wurde eine signifikante Reduktion der DA-Level von 23,2 % verglichen zu gleichaltrigen wt Mäusen gezeigt. Außerdem erniedrigt waren die striatalen Level von NA und 5-HAT bei tg Mäusen, passend zu den bisherigen Ergebnissen bei Parkinson-Patienten.
Immunhistochemische Untersuchungen einer Neuroinflammation im nigrostriatalen Trakt ergaben eine tendenziell erhöhte Infiltration von CD4- und CD8-positiven T-Zellen bei hm2α-SYN-39 Mäusen mit zunehmendem Alter, wobei die Infiltration CD8-positiver Zellen ausgeprägter war als bei CD4-positiven Zellen. Eine noch deutlichere neuroinflammatorische Reaktion zeigte das angeborene IS. Hierbei ergab die immunhistologische Quantifizierung CD11b-positiver mikroglialer Zellen einen hochsignifikanten Anstieg im nigrostriatalen Trakt bei hm2α-SYN-39 Mäusen schon im jungen Alter.
Zusammenfassend präsentierte dieses Parkinson-Mausmodell eine langsam-progrediente Parkinson-Pathologie mit begleitender Neuroinflammation im nigrostriatalen Trakt während des Alterns, wobei die Immunantwort der mikroglialen Zellen zu einem früheren Zeitpunkt einsetzte als die T-Zellinfiltration und Neurodegeneration. Dieses Mausmodell bietet zahlreiche Möglichkeiten zur zukünftigen Erforschung der Pathophysiologie beim MP. Generell weist diese Arbeit auf eine bedeutende Rolle neuroinflammatorischer Prozesse in der Krankheitsprogression der Parkinsonerkrankung hin und soll dazu ermutigen Neuroinflammation durchaus intensiver in tg Tiermodellen zu untersuchen.
Der aus der in Frankreich kultivierten Meeres-Kiefer (Pinus pinaster) gewonnene und standardisierte Rindenextrakt Pycnogenol enthält neben Procyanidinen auch weitere polyphenolische sekundäre Naturstoffe und ist zudem weltweit als USP-gelistetes Nahrungsergänzungsmittel kommerziell erhältlich. Der Konsum von polyphenolreichen Lebensmitteln ist ebenso wie die Einnahme von Pycnogenol mit einer Vielzahl von positiven Effekten bei verschiedenen pathophysiologischen Prozessen assoziiert. Dazu zählen beispielsweise antioxidative oder antiinflammatorische Wirkungen, welche sowohl in vitro als auch in vivo beobachtet werden konnten. Bislang gelang es nach der Einnahme des Extraktes nicht alle in Humanserum oder -plasma detektierten Substanzen zu identifizieren; zudem ist nicht geklärt, von welchen Stoffen konkret eine Bioaktivität ausgeht oder ob diese durch synergistische Effekte zustande kommt. Aus diesen Gründen sollten in der vorliegenden Arbeit im Rahmen einer Klinischen Studie bislang nicht beschriebene Analyten in Humanserum mittels UHPLC-qTOF-MS charakterisiert werden. Hierbei wurde ein ungerichteter, metabolomischer Ansatz gewählt. Die Studienproben der Proband*innen wurden dabei also ohne etwaige Restriktionen analysiert, beispielsweise hinsichtlich möglicher Molekülstrukturen oder der Retentionszeiten der detektierten Analyten. Näher betrachtet werden sollten Analyten, die in einer individuellen Serumprobe nach Beginn der viertägigen Pycnogenol-Einnahme neu auftraten.
In Anschluss an eine Probenvorbereitung mittels methanolischer Proteinpräzipitation im sauren Milieu konnten in dem Humanserum der Proband*innen im ESI-Positiv-Modus fünf und im ESI-Negativ-Modus 23 interessante Analyten nachgewiesen werden, die auf die Einnahme von Pycnogenol zurückzuführen waren. Elf dieser Substanzen konnte eine Struktur zugeordnet werden, wobei alle ausschließlich als Sulfatkonjugate vorlagen. Zu diesen zählten neben Zimtsäure-Derivaten wie Ferulasäure-Sulfat zudem Flavonoide, z. B.
Taxifolin-Sulfat, aber auch Phenylvaleriansäure-Abkömmlinge, beispielsweise Hydroxydihydroxyphenylvaleriansäure-Sulfat, sowie Vertreter aus der Gruppe der Benzoesäuren und weitere Aromaten wie z. B. Pyrogallol-Sulfat oder Protocatechusäure-Sulfat.
Nach unserem besten Wissen war der Aspekt der ausschließlichen Sulfatierung neuartig. Wie aufgrund des interindividuell variablen Metabolismus zu erwarten, insbesondere durch das enterale Mikrobiom, war die Verteilung dieser sogenannten Marker innerhalb der 15 Studienteilnehmenden sehr heterogen. Nicht jeder Marker wurde bei jeder Person erfasst; die Spannweite reichte dabei von einem Teilnehmenden im Falle des mikrobiellen Metaboliten Hydroxyphenylvaleriansäure-Sulfat bis hin zu 14 Proband*innen bei einer nicht-identifizierbaren, jedoch wahrscheinlich endogenen Substanz im ESI-Positiv-Modus. Am häufigsten wurden die elf zuordenbaren Analyten vier Stunden nach der Einnahme von Pycnogenol über einen Zeitraum von vier Tagen bestimmt.
Im Anschluss sollte die Bioaktivität dieser Substanzen in einem endothelialen Zellkulturmodell untersucht werden. Das Endothel wurde als Zielstruktur gewählt, da eine endotheliale Dysfunktion in der Pathogenese einer Reihe von Krankheiten mit ausgeprägter Mortalität und Morbidität eine bedeutende Rolle spielt. Zudem wurde bereits eine positive Wirkung auf die Endothelfunktion nach der Einnahme von Pycnogenol beschrieben, wobei bis dato der Mechanismus auf molekularer Ebene unklar war.
Die Charakterisierung der Sulfatkonjugate bezüglich ihrer Bioaktivität ex vivo mit humanen Endothelzellen aus der Nabelschnurvene (HUVEC) gestaltete sich herausfordernd. Initial sollte untersucht werden, inwiefern diese Substanzen einer durch einen Entzündungsstimulus hervorgerufenen Schädigung der endothelialen Glycocalyx entgegenwirken oder diese vermeiden können. Allerdings ließen sich mit den verschiedenen inflammatorischen Stimuli Lipopolysaccharid (LPS), Tumornekrosefaktor-α (TNF-α) und Wasserstoffperoxid bezüglich Konzentration und Inkubationsdauer keine reproduzierbaren Kulturbedingungen für eine valide ELISA-Quantifizierung des endothelialen Markers Heparansulfat etablieren. Im Anschluss erfolgte unter dem Einfluss einer TNF-α-Stimulation ein orientierendes Screening mit den Monosubstanzen Ferulasäure und Protocatechusäure bzw. mit deren Sulfatkonjugaten in Konzentrationen von 0,1 und 0,5 µM. Dabei zeigten die Konjugate beider Analyten bei der niedrigeren Konzentration tendenziell eine glycocalyx-protektive Wirkung, welche bei der höheren Konzentration jedoch nicht mehr beobachtet werden konnte. Die endotheliale Permeabilität wurde mittels eines FITC-Dextran-Permeabilitäts-Assays untersucht. Hiermit sollte ebenfalls ein möglicher endothel-protektiver Einfluss der sulfatierten Substanzen unter entzündlichen Bedingungen (TNF-α-Stimulation) beleuchtet werden. Jedoch konnte weder bei Ferulasäure oder Protocatechusäure noch bei deren Sulfatkonjugate oder Taxifolin in diesem Modell ein Einfluss auf die endotheliale Barrierefunktion erfasst werden.
Ursprünglich war abschließend geplant in einem ex vivo-Modell die Humanserum-Proben mit dem darin enthaltenen Gemisch aus möglicherweise bioaktiven Metaboliten direkt im Zellkulturmodell auf ihre Wirkung zu testen. Dies hat den Vorteil, dass simultan synergistische Effekte und Einflüsse der Matrix untersucht werden können und ausschließlich in vivo erreichbare Konzentrationen eingesetzt werden. Aufgrund der limitierten Verfügbarkeit der Studienproben und der oben geschilderten heterogenen Ergebnisse wurde auf eine weitere Analyse im Rahmen eines ex vivo-Modells verzichtet.
Mit der vorliegenden Arbeit konnte gezeigt werden, dass nach der Einnahme von Pycnogenol resorbierte Bestandteile und Metabolite in Humanserum ausschließlich als Sulfatkonjugate vorlagen. Zudem wurde bezüglich der Evaluation der endothelialen Bioaktivität durch Polyphenole eine Grundlage für weitere Untersuchungen geschaffen. Damit konnte ein Beitrag zur pharmakokinetischen und -dynamischen Charakterisierung von Pycnogenol geleistet werden.
During the COVID-19 pandemic, the novel coronavirus had an impact not only on public health but also on the mental health of the population. Public sentiment on mental health and depression is often captured only in small, survey-based studies, while work based on Twitter data often only looks at the period during the pandemic and does not make comparisons with the pre-pandemic situation. We collected tweets that included the hashtags #MentalHealth and #Depression from before and during the pandemic (8.5 months each). We used LDA (Latent Dirichlet Allocation) for topic modeling and LIWC, VADER, and NRC for sentiment analysis. We used three machine-learning classifiers to seek evidence regarding an automatically detectable change in tweets before vs. during the pandemic: (1) based on TF-IDF values, (2) based on the values from the sentiment libraries, (3) based on tweet content (deep-learning BERT classifier). Topic modeling revealed that Twitter users who explicitly used the hashtags #Depression and especially #MentalHealth did so to raise awareness. We observed an overall positive sentiment, and in tough times such as during the COVID-19 pandemic, tweets with #MentalHealth were often associated with gratitude. Among the three classification approaches, the BERT classifier showed the best performance, with an accuracy of 81% for #MentalHealth and 79% for #Depression. Although the data may have come from users familiar with mental health, these findings can help gauge public sentiment on the topic. The combination of (1) sentiment analysis, (2) topic modeling, and (3) tweet classification with machine learning proved useful in gaining comprehensive insight into public sentiment and could be applied to other data sources and topics.
On a daily basis, political decisions are made, often with their full extent of impact being unclear. Not seldom, the decisions and policy measures implemented result in direct or indirect unintended negative impacts, such as on the natural environment, which can vary in time, space, nature, and severity. To achieve a more sustainable world with equitable societies requires fundamental rethinking of our policymaking. It calls for informed decision making and a monitoring of political impact for which evidence-based knowledge is necessary. The most powerful tool to derive objective and systematic spatial information and, thus, add to transparent decisions is remote sensing (RS). This review analyses how spaceborne RS is used by the scientific community to provide evidence for the policymaking process. We reviewed 194 scientific publications from 2015 to 2020 and analysed them based on general insights (e.g., study area) and RS application-related information (e.g., RS data and products). Further, we classified the studies according to their degree of science–policy integration by determining their engagement with the political field and their potential contribution towards four stages of the policy cycle: problem identification/knowledge building, policy formulation, policy implementation, and policy monitoring and evaluation. Except for four studies, we found that studies had not directly involved or informed the policy field or policymaking process. Most studies contributed to the stage problem identification/knowledge building, followed by ex post policy impact assessment. To strengthen the use of RS for policy-relevant studies, the concept of the policy cycle is used to showcase opportunities of RS application for the policymaking process. Topics gaining importance and future requirements of RS at the science–policy interface are identified. If tackled, RS can be a powerful complement to provide policy-relevant evidence to shed light on the impact of political decisions and thus help promote sustainable development from the core.
Background
Ischemic stroke immediately evokes a strong neuro-inflammatory response within the vascular compartment, which contributes to primary infarct development under vessel occlusion as well as further infarct growth despite recanalization, referred to as ischemia/reperfusion injury. Later, in the subacute phase of stroke (beyond day 1 after recanalization), further inflammatory processes within the brain parenchyma follow. Whether this second wave of parenchymal inflammation contributes to an additional/secondary increase in infarct volumes and bears the potential to be pharmacologically targeted remains elusive. We addressed the role of the NLR-family pyrin domain-containing protein 3 (NLRP3) inflammasome in the subacute phase of ischemic stroke.
Methods
Focal cerebral ischemia was induced in C57Bl/6 mice by a 30-min transient middle cerebral artery occlusion (tMCAO). Animals were treated with the NLRP3 inhibitor MCC950 therapeutically 24 h after or prophylactically before tMCAO. Stroke outcome, including infarct size and functional deficits as well as the local inflammatory response, was assessed on day 7 after tMCAO.
Results
Infarct sizes on day 7 after tMCAO decreased about 35% after delayed and about 60% after prophylactic NLRP3 inhibition compared to vehicle. Functionally, pharmacological inhibition of NLRP3 mitigated the local inflammatory response in the ischemic brain as indicated by reduction of infiltrating immune cells and reactive astrogliosis.
Conclusions
Our results demonstrate that the NLRP3 inflammasome continues to drive neuroinflammation within the subacute stroke phase. NLRP3 inflammasome inhibition leads to a better long-term outcome—even when administered with a delay of 1 day after stroke induction, indicating ongoing inflammation-driven infarct progression. These findings may pave the way for eagerly awaited delayed treatment options in ischemic stroke.
Abstract
Neuropathic pain affects 6.9 to 10% of the general population, arises from lesion or disease of the somatosensory nervous system and is still challenging to treat. Indeed, current treatments efficacy are relatively low and present strong side effects. To that extent, identifying new targets and developing new treatment strategies constitute a priority. The blood nerve barrier consists of the endoneurial micro-blood vessels and the perineurium sealed by tight junctions constituted of tight junction proteins such claudin-5 and claudin-1. As the functional blood nerve barrier allows nerve tissue protection from external elements and maintains homeostasis, a destabilization or a disruption leads to infiltration of immunocytes promoting neuroinflammation and increased inflammatory mediators that can sensitize nociceptors and enhance pain. Thus resealing the blood nerve barrier in case of neuropathic pain could be a possible treatment strategy.
Specialised proresolving mediators such lipoxin A4 and resolvin D1 are small lipids that bind to receptors such the formylpeptide recptor 2 (FPR2) and resolve inflammation. Specially resolvin D1 as anti-inflammatory and analgesic properties. Thus using resolvin D1 or eventually other specialized proresolving mediators in neuropathic pain could reseal the blood nerve barrier and resolve neuropathic pain. The present work aimed to characterize the blood nerve barrier in a preclinical model of diabetic polyneuropathy and nerve injury (chronic constriction injury) and to identify specialized proresolving mediators that seal the blood nerve barrier and thereby alleviate neuropathic pain.
In diabetic polyneuropathy, the blood nerve barrier is permeable only to small molecules, which is due to the loss of claudin-1 in the perineurium and a reduced number of blood vessel- associated macrophages. Interestingly, blood nerve barrier permeability did not occur until four to eight weeks after diabetes induction, whereas mechanical hyperalgesia was measurable as early as two weeks. This suggests a pain-maintaining rather than a pain-triggering role of the blood nerve barrier.
In case of chronic constriction injury, a resolution process of both mechanical and thermal hyperalgesia occurs between three to six weeks after injury. Here, the blood nerve barrier is permeable to both small and large molecules from the beginning. The pain recovery process occurs primarily in parallel with the sealing of the endoneurial barrier to large molecules such as fibrinogen from the plasma and its degradation. Perineurium is still permeable nine weeks after injury. Metabolomic analyses show that especially precursors of Resolvin D1 as well as its receptor FPR2, are upregulated at the beginning of pain resolution. Application of resolvin
D1 loaded nanoparticles or agonists of FPR2 at the injury site before the onset of pain resolution accelerates the process and fibrinogen is no longer detectable in the endoneurium. Depending on the nerve damage, the blood nerve barrier is affected to varying degrees. Direct mechanical trauma and the accompanying inflammation lead to a more pronounced and long-lasting permeability - independent hyperalgesia. Possibly permeability, at least for small molecules, is important for prolonged reparative processes. In the nerve, permeability of capillaries in particular depends not only on tight junctions but also on other cells: in addition to macrophages, pericytes could also have a sealing effect. Endoneurial fibrinogen triggers pain; the exact mechanism remains to be investigated. Resolvin-containing nanoparticles were particularly effective and could be used locally as they contain endogenous substances in non- toxic particles.
Natural DNA storage allows cellular differentiation, evolution, the growth of our children and controls all our ecosystems. Here, we discuss the fundamental aspects of DNA storage and recent advances in this field, with special emphasis on natural processes and solutions that can be exploited. We point out new ways of efficient DNA and nucleotide storage that are inspired by nature. Within a few years DNA-based information storage may become an attractive and natural complementation to current electronic data storage systems. We discuss rapid and directed access (e.g. DNA elements such as promotors, enhancers), regulatory signals and modulation (e.g. lncRNA) as well as integrated high-density storage and processing modules (e.g. chromosomal territories). There is pragmatic DNA storage for use in biotechnology and human genetics. We examine DNA storage as an approach for synthetic biology (e.g. light-controlled nucleotide processing enzymes). The natural polymers of DNA and RNA offer much for direct storage operations (read-in, read-out, access control). The inbuilt parallelism (many molecules at many places working at the same time) is important for fast processing of information. Using biology concepts from chromosomal storage, nucleic acid processing as well as polymer material sciences such as electronical effects in enzymes, graphene, nanocellulose up to DNA macramé , DNA wires and DNA-based aptamer field effect transistors will open up new applications gradually replacing classical information storage methods in ever more areas over time (decades).
Interpreting blood gas analysis results can be challenging for the clinician, especially in stressful situations under time pressure. To foster fast and correct interpretation of blood gas results, we developed Visual Blood. This computer-based, multicentre, noninferiority study compared Visual Blood and conventional arterial blood gas (ABG) printouts. We presented six scenarios to anaesthesiologists, once with Visual Blood and once with the conventional ABG printout. The primary outcome was ABG parameter perception. The secondary outcomes included correct clinical diagnoses, perceived diagnostic confidence, and perceived workload. To analyse the results, we used mixed models and matched odds ratios. Analysing 300 within-subject cases, we showed noninferiority of Visual Blood compared to ABG printouts concerning the rate of correctly perceived ABG parameters (rate ratio, 0.96; 95% CI, 0.92–1.00; p = 0.06). Additionally, the study revealed two times higher odds of making the correct clinical diagnosis using Visual Blood (OR, 2.16; 95% CI, 1.42–3.29; p < 0.001) than using ABG printouts. There was no or, respectively, weak evidence for a difference in diagnostic confidence (OR, 0.84; 95% CI, 0.58–1.21; p = 0.34) and perceived workload (Coefficient, 2.44; 95% CI, −0.09–4.98; p = 0.06). This study showed that participants did not perceive the ABG parameters better, but using Visual Blood resulted in more correct clinical diagnoses than using conventional ABG printouts. This suggests that Visual Blood allows for a higher level of situation awareness beyond individual parameters’ perception. However, the study also highlighted the limitations of today’s virtual reality headsets and Visual Blood.
Diabetes mellitus is an incurable, metabolic disease, which is associated with severe long-term complications. The in vitro generation of pancreatic β-cells from human induced pluripotent stem cells (hiPSCs) represent a promising strategy for a curative therapy of diabetes mellitus. However, current differentiation strategies largely fail to produce functional β-cells in vitro and require an additional in vivo transplantation to achieve terminal maturation. Previous studies demonstrated a beneficial effect of the extracellular matrix (ECM) on the survival and sustained function of adult, isolated islets of Langerhans. This raises the question whether organ-specific cell-ECM interactions might represent the missing link driving the final stage of β-cell development. In order to address this issue, this study investigated the impact of the pancreas ECM on in vitro β-cell differentiation and its use for the establishment of a pancreatic endocrine organ model.
To this purpose, a pancreas-specific ECM scaffolds (PanMa) was derived from porcine pancreata using whole organ decellularization with Sodium Deoxycholate. In a first step, the generated PanMa was thoroughly characterized using (immuno-) histological stainings, scanning electron microscopy and DNA quantification as well as perfusion and recellularization experiments with endothelial cells. Based on these data, a scoring system (PancScore) for a standardized PanMa generation was developed. Next, the generated PanMa was tested for the presence of tissue-specific ECM features. Therefore, the biophysical and physico-structural characteristics, such as rigidity, porosity and hygroscopy were analyzed using rheological measurements, particle diffusion analyses as well as a water evaporation assay and compared to the properties of ECM scaffolds derived from porcine small intestine (SISser) and lung (LungMa) to examine organ-specific scaffold cues. Following the thorough scaffold characterization, the impact of the PanMa on pluripotency and early development of hiPSC was studied. To this purpose, gene and protein expression of hiPSCs during maintenance culture and spontaneous differentiation on the PanMa were assessed. In a next step, the impact of the PanMa on the pancreatic endocrine differentiation of hiPSCs was tested. Therefore, the PanMa was used as a liquid media supplement or as a solid scaffold during the directed differentiation of hiPSC towards either pancreatic hormone-expressing cells (Rezania et al. 2012; Rezania et al. 2014) or maturing β-cells (Rezania et al. 2014). The impact of the PanMa on the generated cells was examined by gene expression analysis, immunohistochemical staining of important stage markers, as well as glucose stimulated insulin secretion assays. In a last part of this study, the potential of the PanMa for the prolonged culture of hiPSC derived endocrine cells for the establishment of an in vitro organ model of the endocrine pancreas was examined. Therefore, a PanMa-derived hydrogel was generated and used for the encapsulation and culture of hiPSC-derived hormone-expressing cells (HECs). The influence of the PanMa-hydrogel culture was analyzed on gene, protein and functional level by gene expression analysis, immunohistochemical stainings and glucose stimulated insulin secretion.
Whole organ decellularization resulted in the generation of an acellular PanMa scaffold, with low amounts of residual DNA and a preserved ECM micro- and ultrastructure, including important ECM components, such as collagen I, III and IV. Furthermore, the PanMa maintained an intact vessel system and was verified as cytocompatible as demonstrated by the successful recellularization of the arterial system with human endothelial cells. In comparison to SISser and LungMa, the PanMa was characterized as a relative soft, hygroscopic scaffold with a collagen-fiber based structure. Furthermore, the findings indicate that the ECM-specific properties have a relevant effect on the stem cell character and early multi-lineage decisions of hiPSCs. In this regard, maintenance of hiPSCs on the PanMa resulted in a slightly changed expression of pluripotency genes (OCT4, SOX2 and NANOG) and a weak immunohistochemical signal for NANOG protein, indicating a PanMa-dependent impact on hiPSC pluripotency. Strikingly, this presumption was corroborated by the finding that culture on the PanMa promoted an endodermal development of hiPSCs during spontaneous differentiation. In line with that, pancreatic differentiation of hiPSC on both the PanMa and SISser resulted in a significant decrease of glucagon and somatostatin gene expression as well as an unaltered insulin expression, suggesting an ECM-driven suppression of the development of non β-cell endocrine cells. However, this change did not result in an improved glucose stimulated insulin secretion of the generated HECs. Moreover, use of the PanMa as a hydrogel allowed prolonged culture of these cells in a defined culture system. HECs were viable after 21 days of culture, however already showed an altered islet morphology as well as a slightly decreased glucose stimulated insulin secretion.
Altogether, this study demonstrates a relevant biological effect of tissue specific ECM cues on the in vitro differentiation of hiPSCs. More specifically, the data indicate an involvement of the ECM in the endocrine commitment of hiPSC-derived pancreatic cells during directed differentiation highlighting the ECM as an important regulator of pancreatic development. Collectively, these findings emphasize the relevance of the ECM for the fabrication of functional hiPSC-derived cell types and suggest a much stronger consideration of organ specific ECM cues for tissue engineering approaches as well as clinical translation in regenerative medicine.
Most of the studies in cell biology primarily focus on models from the opisthokont group of eukaryotes. However, opisthokonts do not encompass the full diversity of eukaryotes. Thus, it is necessary to broaden the research focus to other organisms to gain a comprehensive understanding of basic cellular processes shared across the tree of life. In this sense, Trypanosoma brucei, a unicellular eukaryote, emerges as a viable alternative. The collaborative efforts in genome sequencing and protein tagging over the past two decades have significantly expanded our knowledge on this organism and have provided valuable tools to facilitate a more detailed analysis of this parasite. Nevertheless, numerous questions still remain.
The survival of T. brucei within the mammalian host is intricately linked to the endo-lysosomal system, which plays a critical role in surface glycoprotein recycling, antibody clearance, and plasma membrane homeostasis. However, the dynamics of the duplication of the endo-lysosomal system during T. brucei proliferation and its potential relationship with plasma membrane growth remain poorly understood. Thus, as the primary objective, this thesis explores the endo-lysosomal system of T. brucei in the context of the cell cycle, providing insights on cell surface growth, endosome duplication, and clathrin recruitment. In addition, the study revisits ferritin endocytosis to provide quantitative data on the involvement of TbRab proteins (TbRab5A, TbRab7, and TbRab11) and the different endosomal subpopulations (early, late, and recycling endosomes, respectively) in the transport of this fluid-phase marker. Notably, while these subpopulations function as distinct compartments, different TbRabs can be found within the same region or structure, suggesting a potential physical connection between the endosomal subpopulations. The potential physical connection of endosomes is further explored within the context of the cell cycle and, finally, the duplication and morphological plasticity of the lysosome are also investigated. Overall, these findings provide insights into the dynamics of plasma membrane growth and the coordinated duplication of the endo-lysosomal system during T. brucei proliferation. The early duplication of endosomes suggests their potential involvement in plasma membrane growth, while the late duplication of the lysosome indicates a reduced role in this process. The recruitment of clathrin and TbRab GTPases to the site of endosome formation supports the assumption that the newly formed endosomal system is active during cell division and, consequently, indicates its potential role in plasma membrane homeostasis.
Furthermore, considering the vast diversity within the Trypanosoma genus, which includes ~500 described species, the macroevolution of the group was investigated using the combined information of the 18S rRNA gene sequence and structure. The sequence-structure analysis of T. brucei and other 42 trypanosome species was conducted in the context of the diversity of Trypanosomatida, the order in which trypanosomes are placed. An additional analysis focused on Trypanosoma highlighted key aspects of the group’s macroevolution. To explore these aspects further, additional trypanosome species were included, and the changes in the Trypanosoma tree topology were analyzed. The sequence-structure phylogeny confirmed the independent evolutionary history of the human pathogens T. brucei and Trypanosoma cruzi, while also providing insights into the evolution of the Aquatic clade, paraphyly of groups, and species classification into subgenera.
Background
To cover soft tissue defects, the perforator-based propeller flap offers the option to rotate healthy tissue into complex wounds. By rotating the flap, the perforator is torqued. As a result, perfusion changes are possible.
Methods
A retrospective data analysis of patients was done, who received a propeller flap to cover soft tissue defects of the lower extremity as well as a peri- and postoperative perfusion monitoring with a laser-Doppler-spectrophotometry system. Additionally, patient-specific data were collected.
Results
Seven patients were identified. Four patients experienced early complications, two epidermolysis of the distal flap areas, three wound healing disorders, and one partial flap necrosis. Intraoperative perfusion monitoring showed a decline of blood flow after incision of the flap, especially at distal flap site. In case of complications, there were prolonged blood flow declines up to the first postoperative day.
Conclusion
Torqueing the perforator by rotating the flap can cause an impairment in inflow and outflow. If the impairment is prolonged, perfusion-associated complications are possible. The identification of a viable perforator is particularly important. In addition, a conservative postoperative mobilization is necessary to compensate for the impaired and adapting outflow.
Highlights
• Beta-Guided programming is an innovative approach that may streamline the programming process for PD patients with STN DBS.
• While preliminary findings from our study suggest that Beta Titration may potentially mitigate STN overstimulation and enhance symptom control,
• Our results demonstrate that beta-guided programming significantly reduces programming time, suggesting it could be efficiently integrated into routine clinical practice using a commercially available patient programmer.
Background
Subthalamic nucleus deep brain stimulation (STN-DBS) is an effective treatment for advanced Parkinson's disease (PD). Clinical outcomes after DBS can be limited by poor programming, which remains a clinically driven, lengthy and iterative process. Electrophysiological recordings in PD patients undergoing STN-DBS have shown an association between STN spectral power in the beta frequency band (beta power) and the severity of clinical symptoms. New commercially-available DBS devices now enable the recording of STN beta oscillations in chronically-implanted PD patients, thereby allowing investigation into the use of beta power as a biomarker for DBS programming.
Objective
To determine the potential advantages of beta-guided DBS programming over clinically and image-guided programming in terms of clinical efficacy and programming time.
Methods
We conducted a randomized, blinded, three-arm, crossover clinical trial in eight Parkinson's patients with STN-DBS who were evaluated three months after DBS surgery. We compared clinical efficacy and time required for each DBS programming paradigm, as well as DBS parameters and total energy delivered between the three strategies (beta-, clinically- and image-guided).
Results
All three programming methods showed similar clinical efficacy, but the time needed for programming was significantly shorter for beta- and image-guided programming compared to clinically-guided programming (p < 0.001).
Conclusion
Beta-guided programming may be a useful and more efficient approach to DBS programming in Parkinson's patients with STN-DBS. It takes significantly less time to program than traditional clinically-based programming, while providing similar symptom control. In addition, it is readily available within the clinical DBS programmer, making it a valuable tool for improving current clinical practice.
In dieser Arbeit wurde ein Kollektiv chronisch herzinsuffizienter Patienten aus der niedergelassenen kardiologischen Betreuung in Bayern analysiert und auf die Umsetzung der zum Zeitpunkt der HF-Bavaria Studie gültigen Leitlinien untersucht. Dabei wurde das Patientenkollektiv nach dem Geschlecht und zusätzlich auch nach den neu definierten Herzinsuffizienz-Klassen der aktuell gültigen Leitlinien eingeteilt, um Unterschiede und Gemeinsamkeiten innerhalb dieser Differenzierungen darstellen zu können und einen Vergleich zu den Studien der jüngeren Vergangenheit zu ermöglichen.
Die Patienten der HF-Bavaria Studie waren zu 65,9 % männlich (n = 3569) und zu 34,1 % weiblich (n = 1848). Die Frauen litten häufiger unter HFpEF, waren seit kürzerer Zeit herzinsuffizient und waren in der Vergangenheit seltener zur Therapieintensivierung oder Intervention hospitalisiert. Die Patientinnen berichteten dabei weniger häufig Komorbiditäten. So fanden sich bei den Frauen seltener KHK, Niereninsuffizienz oder Diabetes mellitus, hingegen häufiger Herzklappenerkrankungen und Vorhofflimmern. Weiterhin wurden die Patientinnen weniger häufig mit ACE-Hemmer, Betablocker und MRA, dagegen häufiger mit ARB und Digitalis behandelt.
Im Patientenkollektiv der HF-Bavaria Studie hatten 29,0 % eine HFrEF (n = 1581), 28,9 % eine HFmrEF (n = 1577) und 42,0 % eine HFpEF (n = 2291). Patienten mit HFrEF waren überwiegend männlich, zum größten Teil seit mehr als 5 Jahren herzinsuffizient und im Vergleich zu den anderen Herzinsuffizienz-Klassen häufiger in den NYHA-Stadien III und IV eingestuft. HFrEF Patienten hatten den größten Anteil an bereits erfolgten Interventionen und Device-Therapien und die durchschnittlich höchste Anzahl an Komorbiditäten. Das Komorbiditätenspektrum bei Patienten mit HFmrEF lag prozentual in den meisten Kategorien zwischen den beiden anderen Herzinsuffizienz-Klassen. Patienten mit HFpEF waren überThe ewiegend weiblich, wiesen vergleichsweise am häufigsten eine komorbide Hypertonie oder ein Vorhofflimmern auf, während eine KHK deutlich seltener vorlag, als es in den anderen Herzinsuffizienz-Klassen der Fall war.
Die Prüfung der leitliniengerechten Pharmakotherapie bei HFrEF-Patienten ergab eine insgesamt gleichwertige Verschreibungshäufigkeit im geschlechtsspezifischen Vergleich der nach NYHA-Stadium indizierten Medikamentenklassen und Kombinationstherapien. Lediglich im NYHA-Stadium III konnte gezeigt werden, dass Männer signifikant häufiger mit einem Betablocker therapiert wurden. Weiterhin zeigte sich, bis auf wenige Ausnahmen, eine auch im nationalen und internationalen Vergleich hohe prozentuale Einnahme der stadienabhängig indizierten Medikamente. Die Einnahmerate von MRAs war vergleichsweise noch geringer als zu erwarten wäre, jedoch konnte das begleitende Vorliegen relevanter Kontraindikationen nicht zuverlässig genug erfasst werden, um die tatsächliche Versorgungslücke zu quantifizieren.
Die Analyse der Pharmakotherapie von HFmrEF- und HFpEF-Patienten zeigte, trotz bisher fehlender wissenschaftlicher Erkenntnisse zur optimalen medikamentösen Therapie dieser Patientengruppen, sehr ähnliche Einnahmehäufigkeiten der verschiedenen Substanzklassen im Vergleich zu den HFrEF-Patienten.
Die Therapie mit Devices war im Patientenkollektiv der HF-Bavaria Studie vergleichsweise selten und dabei häufiger bei männlichen Patienten vorzufinden. Die Analyse der leitliniengetreuen Indikationen von ICDs, CRTs und CRT-ICDs zu den tatsächlich implantierten Devices ergab Hinweise auf eine Unterversorgung vermittels apparativer Therapiemöglichkeiten.
Die Auswertung der HF-Bavaria Studie bestätigte die von uns erwartete Heterogenität und Komplexität der herzinsuffizienten Patienten in der niedergelassenen kardiologischen Betreuung. In dieser Arbeit konnte gezeigt werden, dass bedeutsame Unterschiede im Hinblick auf das Profil, den Verlauf und die Therapie von männlichen und weiblichen herzinsuffizienten Patienten bestehen. Die Therapieempfehlungen der Leitlinien richten sich trotz dieser Unterschiede vorrangig nach der Herzinsuffizienz-Klasse der Patienten. Bisher existierten in den Leitlinien vorrangig Therapieempfehlungen für Patienten mit einer HFrEF (und LVEF <40 %). Im Patientenkollektiv fanden sich jedoch zu 71 % Patienten mit einer LVEF ≥40 %. Dies bedeutet, dass für den Großteil der Patienten in unserer Studie bisher keine evidenzbasierten Behandlungsalgorithmen existieren, insbesondere zur Pharmakotherapie. Künftig sollte die Forschung vermehrt auf diese Evidenzlücken eingehen und idealerweise eine personalisierte Therapie ermöglichen.
Abschließend lässt sich feststellen, dass die leitliniengerechte Therapie der herzinsuffizienten Patienten in der niedergelassenen kardiologischen Versorgung in Bayern eine im nationalen und internationalen Kontext fortgeschrittene Qualität besitzt. Dennoch wurden erwartungsgemäß Möglichkeiten zur Qualitätsverbesserung im vorliegenden Projekt identifiziert.