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- Graduate School of Life Sciences (85)
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- Institut für Anorganische Chemie (60)
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- Institut für Organische Chemie (37)
- Klinik und Poliklinik für Anästhesiologie (ab 2004) (37)
Schriftenreihe
Sonstige beteiligte Institutionen
- DFG Forschungsgruppe 2757 / Lokale Selbstregelungen im Kontext schwacher Staatlichkeit in Antike und Moderne (LoSAM) (2)
- Siemens AG (2)
- Agricultural Center, BASF SE, 67117 Limburgerhof, Germany (1)
- Akademie der Wissenschaften und der Literatur, Mainz (1)
- Bayer AG, Research & Development, Pharmaceuticals, Investigational Toxicology (1)
- Betriebsärztlicher Dienst der Universität Würzburg (1)
- Center of Excellence for Science and Technology - Integration of Mediterranean region (STIM), Faculty of Science, University of Split, Poljička cesta 35, 2100 Split, Croatia (1)
- Comprehensive Cancer Center Mainfranken (1)
- Core Unit Systemmedizin (1)
- Departamento de Química, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Madrid, Spain (1)
Background and Objective
The aim of this single‐centre, two‐arm, parallel‐group, double‐blinded, randomised controlled trial was to investigate the disputed specific effectiveness of acupuncture by comparing acupuncture on specific and non‐specific points among patients with non‐chronic, painful TMDs.
Methods
Following predefined eligibility criteria, 49 consecutive patients of both sexes were recruited to the study. All subjects were diagnosed with a non‐chronic (Graded Chronic Pain Scale grade <3) painful TMD, as assessed using the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). Patients were randomly assigned to group A (acupuncture on specific points) or group B (acupuncture on non‐specific points) after the initial examination (T0). Both acupuncture treatment sessions were conducted by a trained dentist once a week for four weeks. The examination was repeated five weeks (T5) after T0 by one calibrated examiner who was unaware of the study groups. Characteristic pain intensity (CPI) was evaluated as the main outcome criterion and compared between times and treatment groups by means of non‐parametric tests (significance level set at P = .05). Secondary outcomes comprised the maximum corrected active mouth‐opening without pain (MAO); patients’ expectations regarding acupuncture treatment and pain development; depressivity; and oral health‐related quality of life (OHRQoL).
Results
A total of 41 patients (38 female) successfully completed the study (mean age: 40.17 ± 16.61). The two groups did not differ significantly at any time in terms of age and CPI. However, CPI was significantly (P < .05) lower at T5 than at T0 for both groups (29.66 and 30.35% lower in group A and group B, respectively). An increase in MAO was observed at T5 for both groups but was significant for group B only (P = .016). All patients had positive expectations of acupuncture therapy, and the two groups did not differ significantly at T5 with regard to the extent to which their expectations had been fulfilled by the treatment (P = .717). Comparison of T0 and T5 showed a statistically significant reduction of depressivity for group A (P = .0205), but no significant change for group B (P = .329). At T5, OHRQoL had improved significantly for both groups (group A, P = .018; group B, P < .001) compared with at T0.
Conclusions
Acupuncture on both specific and non‐specific points reduces the non‐dysfunctional pain of TMD patients. The effect of acupuncture on painful TMD cannot be attributed to the specific point selection.
Objective: We investigated cerebral opioid receptor binding potential in patients with fibromyalgia syndrome (FMS) using positron-emission-tomography (PET) and correlated our results with patients’ systemic interleukin-4 (IL-4) gene expression.
Methods: In this pilot study, seven FMS patients (1 man, 6 women) agreed to participate in experimental PET scans. All patients underwent neurological examination, were investigated with questionnaires for pain, depression, and FMS symptoms. Additionally, blood for IL-4 gene expression analysis was withdrawn at two time points with a median latency of 1.3 years. Patients were investigated in a PET scanner using the opioid receptor ligand F-18-fluoro-ethyl-diprenorphine ([18F]FEDPN) and results were compared with laboratory normative values.
Results: Neurological examination was normal in all FMS patients. Reduced opioid receptor binding was found in mid cingulate cortex compared to healthy controls (p < 0.005). Interestingly, three patients with high systemic IL-4 gene expression had increased opioid receptor binding in the fronto-basal cortex compared to those with low IL-4 gene expression (p < 0.005).
Conclusion: Our data give further evidence for a reduction in cortical opioid receptor availability in FMS patients as another potential central nervous system contributor to pain in FMS.
Aging is a one-way process associated with profound structural and functional changes in the organism. Indeed, the neuromuscular system undergoes a wide remodeling, which involves muscles, fascia, and the central and peripheral nervous systems. As a result, intrinsic features of tissues, as well as their functional and structural coupling, are affected and a decline in overall physical performance occurs. Evidence from the scientific literature demonstrates that senescence is associated with increased stiffness and reduced elasticity of fascia, as well as loss of skeletal muscle mass, strength, and regenerative potential. The interaction between muscular and fascial structures is also weakened. As for the nervous system, aging leads to motor cortex atrophy, reduced motor cortical excitability, and plasticity, thus leading to accumulation of denervated muscle fibers. As a result, the magnitude of force generated by the neuromuscular apparatus, its transmission along the myofascial chain, joint mobility, and movement coordination are impaired. In this review, we summarize the evidence about the deleterious effect of aging on skeletal muscle, fascial tissue, and the nervous system. In particular, we address the structural and functional changes occurring within and between these tissues and discuss the effect of inflammation in aging. From the clinical perspective, this article outlines promising approaches for analyzing the composition and the viscoelastic properties of skeletal muscle, such as ultrasonography and elastography, which could be applied for a better understanding of musculoskeletal modifications occurring with aging. Moreover, we describe the use of tissue manipulation techniques, such as massage, traction, mobilization as well as acupuncture, dry needling, and nerve block, to enhance fascial repair.
Im Rahmen der vorliegenden Dissertation werden mit unterschiedlichen Analysemethoden die Korrelationen zwischen den strukturellen, elektronischen und magnetischen Eigenschaften von Selten Erd-basierten intermetallischen Oberflächenlegierungen anhand der beiden Probensysteme LaPt$_5$/Pt(111) und CePt$_5$/Pt(111) untersucht. Darüber hinaus werden die strukturellen Eigenschaften von Adsorbat-induzierten Oberflächenrekonstruktionen im sub-ML Bereich in reduzierten Dimensionen auf der Halbleiteroberfläche Si(111) anhand der beiden Materialsysteme Si(111)-(5$\times$2)-Au und Si(111)-($\sqrt{3}\times\sqrt{3}$)R30${\degree}$-Sn mit der Methode LEED-IV analysiert.
Das erste experimentelle Kapitel dieser Arbeit behandelt die intermetallische Oberflächenlegierung LaPt$_5$/Pt(111), die sich ausbildet wenn La-Atome auf einem sauberen Pt(111)-Substrat abgeschieden werden und anschließend thermische Energie hinzugefügt wird. Die Dicke der gebildeten Legierung lässt sich über die zuvor angebotene Menge an La-Atomen variieren und resultiert aufgrund der Gitterfehlanpassung von Pt(111) und den obenauf liegenden LaPt$_5$-Filmen in sechs unterschiedliche Beugungsmuster im LEED, deren Überstrukturvektoren durch zwei unterschiedliche Rotationsausrichtungen in Bezug auf das Gitter des Substrats und unterschiedlichen lateralen Gitterkonstanten der Filme gekennzeichnet sind. Die atomare Struktur kann auf eine gemeinsame Kristallstruktur zurückgeführt werden, deren Stöchiometrie aus dickenabhängigen AES-Messungen zu LaPt$_5$ mit einer Pt-reichen Oberflächenabschlusslage bestimmt werden konnte. Die Ergebnisse einer durchgeführten LEED-IV Studie bestätigen das Wachstum der Filme in der CaCu$_5$-Struktur, wobei die Oberflächenterminierungslage im Vergleich zum Volumengitter ein zusätzliches Pt-Atom pro Einheitszelle aufweist, das zusätzlich um einen Wert von \unit{0.26}{\angstrom} aus der Oberfläche hervorsteht. Die La-Atome, die direkt unterhalb der Terminierungslage liegen, erfahren eine Verschiebung in entgegengesetzter Richtung, so dass im Vergleich zum Volumen der Filme eine lokal veränderte Symmetrie im oberflächennahen Bereich vorherrscht und sich auf die elektronischen Eigenschaften der LaPt$_5$-Filme auswirkt. Darüber hinaus wurden die Schwingungseigenschaften der LaPt$_5$-Filme mittels der polarisierten in situ Raman-Spektroskopie bestimmt, bei der die auftretenden Schwingungspeaks durch die Kenntnis der atomaren Struktur und mit Überlegungen aus der Gruppentheorie unterschiedlichen Tiefenbereichen der LaPt$_5$-Filme (Volumen und Oberfläche) zugewiesen werden konnten.
Im zweiten experimentellen Kapitel liegt der Fokus auf der atomaren Struktur sowie auf den elektronischen und magnetischen Eigenschaften des Kondo- und Schwerfermionensystems CePt$_5$/Pt(111). In Abhängigkeit von der vor dem Legierungsprozess angebotenen Menge an Ce-Atomen auf dem Pt(111)-Substrat konnten insgesamt sieben verschiedene LEED-Phasen der CePt$_5$-Filme identifiziert werden, deren jeweilige Oberflächenrekonstruktionen durch eine unterschiedliche Rotationsausrichtung in Bezug auf das Pt(111)-Substrat gekennzeichnet sind. Zusätzlich ist die laterale Gitterkonstante einem Prozess aus Verspannung und Dehnung aufgrund der Gitterfehlanpassung von Film und Substrat ausgesetzt. Eine durchgeführte LEED-IV Analyse bestätigt das Wachstum der Filme in der CaCu$_5$-Struktur mit einer Pt-reichen Oberflächenabschlusslage, deren Pt$_3$-Kagom\'{e}-Lage im Vergleich zum Volumengitter mit einem zusätzlichen Pt-Atom pro Einheitszelle gefüllt ist. Die strukturellen Ergebnisse stimmen mit erzielten Resultaten aus früheren Arbeiten überein und verdeutlichen zudem die isostrukturellen Eigenschaften zur intermetallischen Oberflächenlegierung LaPt$_5$/Pt(111). Dies ermöglicht durch geeignete Vergleichsexperimente an LaPt$_5$/Pt(111) die induzierten Phänomene der $4f$-Elektronen bezüglich des Kondo- und Schwerfermionenverhaltens bei CePt$_5$/Pt(111) zu bestimmen, da La-Atome in ihrem atomaren Aufbau keine $4f$-Elektronen beherbergen. Mit der polarisierten in situ Raman-Spektroskopie aufgenommene Spektren anhand von unterschiedlich dicken CePt$_5$-Filmen beinhalten sowohl charakteristische Schwingungspeaks als auch elektronische Übergänge. Das spektroskopische Verhalten der Schwingungspeaks zeigt dabei nicht nur Gemeinsamkeiten zu LaPt$_5$/Pt(111) bei der Zuweisung der Schwingungsmoden zu den jeweiligen Tiefenbereichen in den CePt$_5$-Filmen, sondern es treten auch Unterschiede auf, da eine CePt$_5$-Schwingungsmode einem anormalen Temperaturverhalten unterliegt, das auf die Wechselwirkung mit den $4f$-Elektronen zurückzuführen ist. Weitere spezifische Raman-Signaturen, die elektronischen Übergängen in Form von Kristallfeldniveauaufspaltungen der $4f$-Elektronen von Ce zugewiesen werden konnten, resultieren ebenfalls aus unterschiedlichen Regionen der CePt$_5$-Filme (Oberfläche, inneres Volumen, Interface). Die magnetischen Eigenschaften der CePt$_5$-Filme wurden mit XAS und XMCD an den Ce M$_{4,5}$-Kanten in Abhängigkeit von der Temperatur, dem Einfallswinkel, der Filmdicke und der Stärke des Magnetfelds analysiert. Die markanten Übergänge zwischen unterschiedlichen Curie-Weiss-Regimen in der inversen Suszeptibilität erlauben Rückschlüsse über das Kristallfeldaufspaltungsschema, die Kondo- und die RKKY-Wechselwirkung und korrelieren mit der Ce-Valenz. Zudem konnte bei tiefen Temperaturen ein Übergang in den kohärenten Schwerfermionen-Zustand für alle untersuchten CePt$_5$-Filmdicken in dieser Arbeit nachgewiesen werden. Durch die Vorhersage eines metamagnetischen Lifshitz-Übergangs für diese Filme, der sich in der Magnetfeldabhängigkeit des magnetischen Moments äußert, konnte durch die Aufnahme von Magnetisierungskurven bei tiefen Temperaturen und hohen Magnetfeldern auf zwei weitere charakteristische Energieskalen der renormalisierten Bandstruktur zugegriffen werden.
Das dritte experimentelle Kapitel widmet sich der mit LEED und LEED-IV durchgeführten Aufklärung der atomaren Struktur eines quasi-eindimensionalen Elektronensystems, bei dem sich die gebildeten Au-Nanodrähte auf der Si(111)-Oberfläche durch eine Si(111)-(5$\times$2)-Au Rekonstruktion beschreiben lassen. Die aufgenommenen LEED-Bilder mit ihren markanten Beugungsreflexen und sogenannten Streifen deuten auf drei gleichwertige Rotationsdomänen, die jeweils um einen Winkel von \unit{120}{\degree} gegeneinander gedreht sind, auf der Oberfläche hin. Zudem konnte aus einer Simulation der Beugungsbilder das Auftreten von Streifen durch drei zusätzliche Spiegeldomänen, die eine Phasenverschiebung von einem halben Überstrukturvektor einführen und bei einer sorgfältigen LEED-IV Analyse ebenfalls berücksichtigt werden sollten, erklärt werden. Aus den in der Literatur nach einer zweiten Rekalibrierung der nötigen Menge an Au-Atomen zur Ausbildung der Si(111)-(5$\times$2)-Au Rekonstruktion in den letzten Jahren heftig diskutierten Strukturmodellen gibt das von Kwon und Kang aufgestellte Geometriemodell (KK-Modell) die beobachteten energieabhängigen Intensitätsmodulationen in den experimentellen Daten beim Vergleich mit theoretisch berechneten IV-Kurven am besten wieder. Für dieses Modell nimmt der R-Faktor nach Pendry bei den unabhängig voneinander betrachteten drei Energieserien unter verschiedenen Einfallswinkeln der Elektronen auf die Probenoberfläche stets den kleinsten Wert an. Unter der expliziten Berücksichtigung von Si-Adatomen, die sich zusätzlich auf der Oberfläche befinden und in einer (5$\times$4)-Einheitszelle beschrieben werden können, bleibt das KK-Modell das zu präferierende Strukturmodell zur Beschreibung der ausgebildeten Au-Ketten und der Si-Honigwabenstruktur bei der Si(111)-(5$\times$2)-Au Oberflächenrekonstruktion.
Im letzten experimentellen Kapitel wird ein zweidimensionales Elektronensystem -- die $\alpha$-Si(111)-($\sqrt{3}\times\sqrt{3}$)R30${\degree}$-Sn Oberflächenrekonstruktion, die sich bei 1/3 ML an Sn-Adsorbaten auf dem Si(111)-Substrat ausbildet -- im Hinblick auf die atomare Struktur bei Raumtemperatur mit LEED und LEED-IV untersucht. Aus den insgesamt sechs in die Analyse aufgenommenen Strukturmodellen, bei denen die Sn-Atome innerhalb der rekonstruierten ($\sqrt{3}\times\sqrt{3}$)R30${\degree}$-Einheitszelle unterschiedliche Adsorptionsplätze auf einer ideal terminierten Si(111)-Oberfläche einnehmen, konnte ein Legierungsverhalten, wie es bei der $\gamma$-Si(111)-($\sqrt{3}\times\sqrt{3}$)R30${\degree}$-Sn Phase auftritt, ausgeschlossen werden. Die Sn-Atome ordnen sich ausschließlich auf der Oberfläche neu an und führen zu einer Relaxation des darunterliegenden Substrats, deren atomare Verschiebungen sich bis in die sechste Si-Lage nachverfolgen lassen. Im Vergleich zu früheren Strukturaufklärungen an diesem Materialsystem bestätigt diese Analyse, dass sich die abgeschiedenen Sn-Atome auf T$_4$-Adsorptionsplätzen energetisch günstig anlagern, wobei die bei drei unterschiedlichen Einfallswinkeln aufgenommenen experimentellen Daten an unterschiedlichen Probenpositionen auf ein vorhandenes bzw. fehlendes Si-Atom auf einem S$_5$-Gitterplatz im darunterliegenden Si(111)-Substrat hindeuten. Außerdem konnte das theoretisch vorhergesagte dynamische Fluktuations-Modell aufgrund der sehr stark erhöhten thermischen Auslenkungen der Sn-Atome aus ihrer Gleichgewichtslage in den Modellrechnungen zur dynamischen Streutheorie nachgewiesen werden. Dies könnte neben den unregelmäßig angeordneten Si-Fehlstellen eine Ursache für das Ausbleiben des strukturell reversiblen Phasenübergangs von einer ($\sqrt{3}\times\sqrt{3}$)R30${\degree}$-Phase zu einer (3$\times$3)-Phase bei tiefen Temperaturen, wie er beispielsweise beim elektronisch vergleichbaren Adsorbatsystem Ge(111)-($\sqrt{3}\times\sqrt{3}$)R30${\degree}$-Sn auftritt, sein.
The eukaryotic parasite Trypanosoma brucei has evolved sophisticated strategies to persist within its mammalian host. Trypanosomes evade the hosts' immune system by antigenic variation of their surface coat, consisting of variant surface glycoproteins (VSGs). Out of a repertoire of thousands of VSG genes, only one is expressed at any given time from one of the 15 telomeric expression sites (ES). The VSG is stochastically exchanged either by a transcriptional switch of the active ES (in situ switch) or by a recombinational exchange of the VSG within the active ES. However, for infections to persist, the parasite burden has to be limited. The slender (sl) bloodstream form secretes the stumpy induction factor (SIF), which accumulates with rising parasitemia. SIF induces the irreversible developmental transition from the proliferative sl to the cell cycle-arrested but fly-infective stumpy (st) stage once a concentration threshold is reached. Thus, antigenic variation and st development ensure persistent infections and transmissibility. A previous study in monomorphic cells indicated that the attenuation of the active ES could be relevant for the development of trypanosomes. The present thesis investigated this hypothesis using the inducible overexpression of an ectopic VSG in pleomorphic trypanosomes, which possess full developmental competence. These studies revealed a surprising phenotypic plasticity: while the endogenous VSG was always down-regulated upon induction, the ESactivity determined whether the VSG overexpressors arrested in growth or kept proliferating. Full ES-attenuation induced the differentiation of bona fide st parasites independent of the cell density and thus represents the sole natural SIF-independent differentiation trigger to date. A milder decrease of the ES-activity did not induce phenotypic changes, but appeared to prime the parasites for SIF-induced differentiation. These results demonstrate that antigenic variation and development are linked and indicated that the ES and the VSG are independently regulated. Therefore, I investigated in the second part of my thesis how ES-attenuation and VSG-silencing can be mediated. Integration of reporters with a functional or defective VSG 3'UTR into different genomic loci showed that the maintenance of the active state of the ES depends on a conserved motif within the VSG 3'UTR. In situ switching was only triggered when the telomere-proximal motif was partially deleted, suggesting that it serves as a DNA-binding motif for a telomere-associated protein. The VSG levels seem to be additionally regulated in trans based on the VSG 3'UTR independent of the genomic context, which was reinforced by the regulation of a constitutively expressed reporter with VSG 3' UTR upon ectopic VSG overexpression.
Diabetes mellitus Typ 1 ist eine chronische Autoimmunerkrankung, die über eine Zerstörung pankreatischer Beta-Zellen der Langerhans-Inseln zu einem absoluten Insulinmangel führt. Ursächlich für die Zerstörung des Pankreasgewebes sind autoreaktive T-Zellen, die eine Entzündungsreaktion (Insulitis) im Pankreas bewirken.
Zentrales Thema der Promotionsarbeit ist die Erforschung grundlegender quantitativer
und qualitativer Eigenschaften von T-Zellen von Diabetikern im Vergleich zu gesunden, alters-gleichen Kontrollpersonen. Der Fokus der Arbeit liegt dabei auf der Analyse von naiven T-Zellen und ihrer Polarisierbarkeit in proinflammatorische Th17 (Interleukin-17-produzierende) Zellen und regulatorische T-Zellen (Tregs), die die Inflammation unterdrücken können. Voruntersuchungen der Arbeitsgruppe zeigten tendenziell eine proportionale Vermehrung von proinflammatorischen T-Zellen (Th17 Zellen) im peripheren Blut von Typ1 Diabetikern.
Aus dem Vollblut wurden mittels Ficoll-Dichtezentrifugation periphere mononukleäre
Zellen des Blutes (PBMC) gewonnen. Über magnetisch aktivierte Zell-Separation (MACS) wurden naive T-Zellen (CD4+CD45RA+CD27+) aus den PBMCs isoliert. Diese naiven Zellen wurden angeregt sich zu adulten, immunkompetenten Zellen zu differenzieren. Die Antigenstimulation der T-Zellen wurde imitiert durch Aktivierung mit Antikörpern gegen die Moleküle CD3 und CD28 oder einem C. albicans-Antigen. Die Stimulation wurde unter Co-Kultivierung mit autologen antigenpräsentierenden Zellen durchgeführt. Die Richtung der Differenzierung wurde durch Zugabe verschiedener Zytokin-Cocktails beeinflusst. Nach Abschluss der Kultivierung wurde sowohl der Phänotyp der Zellen als auch deren Fähigkeit bestimmte Zytokine zu produzieren mittels Durchflusszytometrie (FACS) bestimmt. Weiterhin wurden Suppressionsassays durchgeführt, bei denen die Suppressionsfähigkeit von aus naiven T-Zellen induzierten Tregs auf autologe PBMCs von Typ 1 Diabetes Patienten überprüft wurde. In dem zunächst durchgeführten Vergleich von Kindern mit einer Erstmanifestation mit gesunden Kontrollen konnte eine stärkere IFN-Produktion gezeigt
werden mit signifikanten Unterschieden innerhalb der Ki67+ Zellen. Interessanterweise zeigte sich diese stärkere IFN Sekretion der T-Zellen der Diabetiker unter Bedingungen, die die Expression von TH17-Zellen fördern sollten. Zusätzlich konnten T-Zellen nachgewiesen werden, die für IFN und IL17 doppelt positiv waren. In weiteren Versuchen wurden auch Vergleiche zwischen längere Zeit an Diabetes erkrankten Kindern und erwachsenen Diabetikern mit gesunden Kontrollen durchgeführt.
Bei den erwachsenen Diabetikern konnten dabei mehr IFN+/IL17+ T Zellen innerhalb der Ki67+ T-Zellen nachgewiesen werden als bei den Kontrollen. Die Zellkulturexperimente wurden im Weiteren mit C. albicans-Antigen als einem spezifischen Stimulus des Immunsystems durchgeführt. Die Untersuchung zeigte zunächst einmal, dass das C. albicans-Antigen bezüglich Proliferation und T-Zell-Differenzierung ein deutlich schwächerer Stimulus im Vergleich zur Stimulation mit aCD3/aCD28 war. Beobachtet werden konnte allerdings, dass es durch Stimulation mit dem C. albicans-Antigen insgesamt zu einer stärkeren Aktivierung des TH17-Zell-Systems kam mit Ausnahme der längere Zeit an einem Diabetes
erkrankten Kinder, die eine geringere IL17-Produktion im Vergleich zu den Kontrollen aufwiesen.
Insgesamt zeigten sich teils deutliche Unterschiede zwischen den Gruppen der Diabetiker, so dass von einer Beeinflussung der Ergebnisse durch Krankheitsdauer, Krankheitsaktivität, Alter der Probanden und Therapiedauer ausgegangen werden muss.
Die Untersuchung des Proliferationsverhaltens ergab sowohl bei den proinflammatorischen
T-Zellen als auch bei den Tregs keine Unterschiede zwischen den Diabetikern und den Kontrollpatienten, ebenso wie die quantitative Untersuchung der Ausbildung von CD25+FOXP3+ Tregs aus den naiven T-Zellen unter unspezifischer Stimulation. Unter spezifischer Stimulation hingegen zeigten sich mehr Tregs bei den Kindern mit einer Erstmanifestation und den erwachsenen Diabetikern.
Ebenfalls unter Stimulation mit dem C. albicans-Antigen zeigten sich unter proinflammatorischen Bedingungen bei den Kindern mit einer Erstmanifestation und unter antiinflammatorischen Bedingungen bei den erwachsenen Diabetikern ein signifikant höherer Anteil CD127- Tregs (CD25+FOXP3+) im Vergleich zu den Kontrollprobanden.
Interessanterweise zeigte sich bei den erwachsenen Diabetikern sowohl bei spezifischer
als auch bei unspezifischer Stimulation eine stärkere Produktion von IL17 durch die Tregs.
Die Untersuchung der Expression des Homing-Rezeptors CD62L auf den Tregs ergab keine signifikanten Unterschiede, aber eine höhere Expression bei allen Diabetikern im Vergleich zu den jeweiligen Kontrollgruppen und die Untersuchung des IFN-Rezeptors erbrachte keine signifikanten Unterschiede zwischen den Gruppen, allerdings zeigten sich die Mediane und Mittelwerte bei den Kindern mit einer Erstmanifestation im Vergleich zu den Kontrollen bei unspezifischer Stimulation erhöht.
Zur Ergänzung der Zellkulturexperimente wurden im Weiteren Suppressionsversuche mit aus naiven T-Zellen induzierten Tregs durchgeführt. Die Suppressionsversuche konnten eine geringere Hemmung der Proliferation durch die induzierten Tregs der Diabetiker zeigen und damit auf eine mögliche Dysfunktion der Tregs deuten.
Um Möglichkeiten der Beeinflussung des Immunsystems zu untersuchen wurden die Zellkulturen erneut unter Blockade von IFNy und Zugabe von TGFb durchgeführt. Die Blockade von IFNy führte zu einer geringer ausgeprägten Differenzierung und Proliferation der T-Zellen. Weiterhin konnten in der intrazellulären Färbung weniger IFN positive T-Zellen gefunden werden und es zeigte sich eine stärkere Expression des IFN-Rezeptors. Bei den Kindern mit einer Erstmanifestation zeigte sich zusätzlich auch eine geringere Ausprägung der IL17+ T-Zellen. Hier ergaben sich keine Unterschiede in der Quantität der Tregs. Die erwachsenen Diabetiker zeigten hier weniger Tregs, dafür aber eine stärkere Proliferation innerhalb der Tregs. Bei den Kindern mit einem längere Zeit bestehenden Diabetes hingegen zeigten sich keine quantitativen Unterschiede.
Die Beeinflussung durch Zugabe von TGFb bei den erwachsenen Diabetikern und den Kindern mit einer Erstmanifestation führte zu einer geringeren T-Zell Differenzierung mit mehr naiven T-Zellen und weniger Memory-T-Zellen sowie zu einer geringeren IFNy Expression. Bei den Erwachsenen zeigte sich ebenso eine geringere Proliferation, geringe Anzahlen für Tregs sowie eine geringe Ausprägung der Expression von CD62L und der Produktion von IL17 durch Tregs.
Insgesamt konnte gezeigt werden, dass es Unterschiede zwischen den proinflammatorischen
T-Zellen sowie den induzierten Tregs der Diabetiker im Vergleich zu den gesunden Kontrollen gibt. Insbesondere die Bedeutung von IFNy bei den Erstmanifestation konnte gezeigt werden. Aber auch die Sekretion von IL17 oder die Expression von CD62L auf den Tregs stellen interessante Ansatzpunkte zur weiteren Erforschung des Diabetes dar. Weiterhin zeigten die Suppressionsversuche eine gestörte Regulation durch die induzierten Tregs bei den Diabetikern. Sowohl die Blockade von IFNy als auch die Zugabe von TGFb zeigten inflammationshemmende Wirkung bei den Lymphozyten der Diabetiker in vitro und stellen
interessante Ansatzpunkt für eine mögliche Therapie dar.
Die Rückkehr des Realen
(2020)
We are witnessing a return of the real which philosophy seems illequipped to handle. I argue (1) that this return of the real must be read as a rejection of those philosophical tendencies which were prevalent in the past decades and which I call philosophies of mediation: They supplanted all references to something real by the sole reference to those processes in which reality was supposed to be given or shaped (in interpretations, linguistic structures, historical or social conditions, media…). The current urgency of the question of the real indicates that those philosophies have lost credibility. On the other hand (2), the contemporary attempts to resuscitate philosophical realism cannot be considered satisfactory either. It is curiously the real itself they fail to fully appreciate. All in all (3), the return of the real has to be interpreted as the effect of an event that has little to do with philosophy, namely the return of politics.
Statistical modeling of phenology in Bavaria based on past and future meteorological information
(2020)
Plant phenology is well known to be affected by meteorology. Observed changes in the occurrence of phenological phases arecommonly considered some of the most obvious effects of climate change. However, current climate models lack a representationof vegetation suitable for studying future changes in phenology itself. This study presents a statistical-dynamical modelingapproach for Bavaria in southern Germany, using over 13,000 paired samples of phenological and meteorological data foranalyses and climate change scenarios provided by a state-of-the-art regional climate model (RCM). Anomalies of severalmeteorological variables were used as predictors and phenological anomalies of the flowering date of the test plantForsythiasuspensaas predictand. Several cross-validated prediction models using various numbers and differently constructed predictorswere developed, compared, and evaluated via bootstrapping. As our approach needs a small set of meteorological observationsper phenological station, it allows for reliable parameter estimation and an easy transfer to other regions. The most robust andsuccessful model comprises predictors based on mean temperature, precipitation, wind velocity, and snow depth. Its averagecoefficient of determination and root mean square error (RMSE) per station are 60% and ± 8.6 days, respectively. However, theprediction error strongly differs among stations. When transferred to other indicator plants, this method achieves a comparablelevel of predictive accuracy. Its application to two climate change scenarios reveals distinct changes for various plants andregions. The flowering date is simulated to occur between 5 and 25 days earlier at the end of the twenty-first century comparedto the phenology of the reference period (1961–1990).
SLC2A3 encodes the predominantly neuronal glucose transporter 3 (GLUT3), which facilitates diffusion of glucose across plasma membranes. The human brain depends on a steady glucose supply for ATP generation, which consequently fuels critical biochemical processes, such as axonal transport and neurotransmitter release. Besides its role in the central nervous system, GLUT3 is also expressed in nonneural organs, such as the heart and white blood cells, where it is equally involved in energy metabolism. In cancer cells, GLUT3 overexpression contributes to the Warburg effect by answering the cell's increased glycolytic demands. The SLC2A3 gene locus at chromosome 12p13.31 is unstable and prone to non‐allelic homologous recombination events, generating multiple copy number variants (CNVs) of SLC2A3 which account for alterations in SLC2A3 expression. Recent associations of SLC2A3 CNVs with different clinical phenotypes warrant investigation of the potential influence of these structural variants on pathomechanisms of neuropsychiatric, cardiovascular, and immune diseases. In this review, we accumulate and discuss the evidence how SLC2A3 gene dosage may exert diverse protective or detrimental effects depending on the pathological condition. Cellular states which lead to increased energetic demand, such as organ development, proliferation, and cellular degeneration, appear particularly susceptible to alterations in SLC2A3 copy number. We conclude that better understanding of the impact of SLC2A3 variation on disease etiology may potentially provide novel therapeutic approaches specifically targeting this GLUT.
Der Einsatz von Regionalanästhesien nahm in den letzten Jahren stark zu. Durch die Blockade von spannungsabhängigen Natriumkanälen verhindern Lokalanästhetika eine Depolarisation sowie die neuronale Fortleitung der Schmerzimpulse. In höheren Dosierungen kann es jedoch zu ausgedehnten Blockaden im Myokard mit toxischen Wirkungen auf die Funktion der Muskelzellen kommen. Bis zur Einführung der Lipidemulsionen als Behandlungsoption bei einer Lokalanästhetikaintoxikation war eine prolongierte kardio-pulmonale Reanimation die einzige therapeutische Option.
In dieser Arbeit wurden die aktuell häufig verwendeten langwirksamen Substanzen Bupivacain und Ropivacain hinsichtlich einer divergierenden Kardiotoxizität verglichen und die Präinkubation mit Lipofundin® als Möglichkeit zur Reduktion der Kardiotoxizität getestet.
Mit Zustimmung der Ethikkommission wurden insgesamt 46 humane Herzmuskelbündel in einem Organbad untersucht.
Es erfolgte im Abstand von drei Minuten eine Inkubation mit Koffein in steigenden Konzentrationen (0,5; 1,0; 1,5; 2,0; 3,0; 4,0 mmol/l) und nachfolgend die Applikation von handelsüblichen Lösungen von Lokalanästhetika
(50 – 100 – 150 µl). Es wurden entweder Bupivacain (0,25, 0,5, 0,75 mg), Ropivacain (0,375, 0,75, 1,125 mg) oder Ropivacain in Kombination mit Lipofundin® 20% N (200µl in Verdünnung 1:100) appliziert. Abschließend erfolgte die hochdosierte Gabe von Koffein (Gesamtkonzentration 32 mmol/l), um eine maximale Kontraktur auszulösen.
Es zeigte sich kein signifikanter Unterschied zwischen Bupivacain und Ropivacain hinsichtlich der Kontraktionsamplitude und der Grundspannung bei ähnlichem Verhalten in beiden Gruppen. Die Präinkubation mit Lipofundin® ergab im Vergleich zur Kontrollgruppe keinen signifikanten Effekt.
Eine signifikante konzentrationsabhängige Abnahme der Kontraktionsamplitude und der Grundspannung zeigte sich während der initialen Inkubation mit Koffein.
Initiale Schädigungen, passagere Ermüdungserscheinungen oder hypoxische Stoffwechselzustände könnten trotz bestmöglicher Bedingungen die Ergebnisse beeinträchtigt haben. Die vorliegenden in-vitro-Ergebnisse lassen sich nur limitiert auf in-vivo-Bedingungen übertragen und verlangen nach weiteren Studien, die eine differenzierte und präzise Wirkweise sowie Dosierung von Lipidemulsionen evaluieren.
Blumeria graminis, the obligate biotrophic grass powdery mildew, is a highly pathogenic fungus capable of inflicting foliar diseases and of causing severe yield losses. There is asexual and sexual propagation in the life cycle of B. graminis. In the epidemiological processes of this pathogen, both types of spores - asexual conidia and sexual ascospores – are crucial.
Conidia of B. graminis are demonstrated to perceive cuticular very-long-chain aldehydes as molecular signal substances notably promoting germination and differentiation of the infection structure (the appressorium) – the prepenetration processes – in a concentration- and chain-length-dependent manner. Conidial germination and appressorium formation are known to be dramatically impeded by the presence of free water on the host surface. However, sexually formed ascospores are reported to easily germinate immersed in water. There are abundant assays on conidial prepenetration processes. However, with respect to the stimulating effects of very-long-chain aldehydes and to the influence of the presence of free water, ascosporic prepenetration processes are still obscure.
In order to study the effects of very-long-chain aldehydes on the ascosporic prepenetration processes of wheat powdery mildew fungus B. graminis f. sp. tritici, Formvar®-based in vitro systems were applied to exclude the secondary host effects (such as host resistance) and to reproducibly provide homogeneous hydrophobic substratum surfaces. By the presence of even-numbered very-long-chain aldehydes (C22 - C30), the appressorium formation of the ascospores was notably triggered in a chain-length dependent manner. N-octacosanal (C28) was the most inducing aldehyde tested. Unlike conidia, ascospores could easily differentiate immersed in water and showed a more variable differentiation pattern even with a single germ tube differentiating an appressorium.
To evaluate the alternative management against barley powdery mildew fungus Blumeria graminis f. sp. hordei, the suppressing effects of UV-C irradiation on the developmental processes of conidia on artificial surfaces (in vitro) and on host leaf surfaces (in vivo) were assayed. In vitro and in vivo, a single dose of 100 J m-2 UV-C was adequate to decrease conidial germination to < 20 % and to reduce appressorium formation to values < 5 %. UV-C irradiation negatively affected colony pustule size and vegetative propagation. Under photoperiodic conditions of 2h light/16h dark, 6h dark/12h light or 6h dark/18h light, UV-C-treated conidia showed photoreactivation (photo-recovery). White light-mediated photoreactivation was most effective immediately after UV-C irradiation, suggesting that a prolonged phase of darkness after UV-C application increased the efficacy of management against B. graminis. UV-C irradiation increased transcript levels of three putative photolyase genes in B. graminis, indicating those were probably involved in photoreactivation processes. However, mere white light or blue light (wavelength peak, 475 nm) could not induce the up-regulation of these genes.
To determine whether visible light directly impacted the prepenetration and penetration processes of this powdery mildew pathogen, conidia of Blumeria graminis f. sp. hordei and Blumeria graminis f. sp. tritici were inoculated onto artificial surfaces and on host leaf surfaces. Samples were analyzed after incubation periods under light conditions (white light intensity and spectral quality). Increasing white light intensities directly impaired conidial prepenetration processes in vitro but not in vivo. Applying an agar layer under the wax membrane compensated for conidial water loss as a consequence of high white light irradiation. Light stimulated in vitro and in vivo the appressorium elongation of B. graminis in a wavelength-dependent manner. Red light was more effective to trigger the elongation of appressorium than blue light or green light assayed.
Taken together, the findings of this study demonstrate that 1) a host surface recognition principle based on cuticular very-long-chain aldehydes is a common feature of B. graminis f. sp. tritici ascospores and conidia; 2) the transcriptional changes of three putative photolyase genes in B. graminis are mediated in a UV-C-dependent manner; 3) light directly affected the (pre)penetration processes of B. graminis.
We herein report the case of a 73‐year‐old male patient who was diagnosed with leukemic non‐nodal MCL. This patient had received six cycles of bendamustine, which resulted in a transient remission, and a second‐line therapy with ibrutinib, which unfortunately failed to induce remission. We started a treatment with single‐agent obinutuzumab at a dose of 20 mg on day 1, 50 mg on day 2‐4, 330 mg on day 5, and 1000 mg on day 6. The laboratory analysis showed a rapid decrease of leukocyte count. Four weeks later, we repeated the treatment with obinutuzumab at a dose of 1000 mg q4w and started a therapy with venetoclax at a dose of 400 mg qd, which could be increased to 800 mg qd from the third cycle. This combination therapy was well tolerated. The patient achieved a complete remission (CR) after three cycles of obinutuzumab and venetoclax. To date, the patient has a progression‐free survival of 17 months under ongoing obinutuzumab maintenance q4w. This is the first report about obinutuzumab and venetoclax induced CR in rituximab‐intolerant patient with an ibrutinib‐resistant MCL. This case suggests that obinutuzumab‐ and venetoclax‐based combination therapy might be salvage therapy in patients with ibrutinib‐resistant MCL.
Background
Even in the era of novel immunotherapies for multiple myeloma (MM), treatment of late‐stage relapsed/refractory (RR) patients remains challenging. The aim of our study was to analyze the efficacy and safety of the five‐drug combination pomalidomide, bortezomib, doxorubicin, dexamethasone, and daratumumab (“Pom‐PAD‐Dara”) in RRMM.
Methods
We retrospectively analyzed data of 56 patients with RRMM who received Pom‐PAD‐Dara between September 2016 and May 2019.
Results
Patients were heavily pretreated with a median of four prior lines of therapy, including autologous and allogenic stem cell transplant in 50 (89%) and six (11%) patients, respectively. The overall response rate (ORR) was 78% and we observed partial remission, very good partial remission, and complete remission in 27 (48%), 13 (23%) and four (7%) patients, respectively. Median progression‐free survival was 7 months (95% CI, 3.3‐10.7) and the median overall survival was not reached at 24 months. Adverse events grade ≥ 3 were observed 41 (73%) patients and included neutropenia (n = 28, 50%), anemia (n = 22, 39%), thrombocytopenia (n = 21, 38%), and pneumonia (n = 6, 11%).
Conclusion
Pom‐PAD‐Dara represents a promising multiagent regimen in heavily pretreated RRMM patients with high ORR and an acceptable safety profile.
In the last few years, monoclonal antibodies (mAbs) such as elotuzumab and daratutumab have brought the treatment of multiple myeloma (MM) into the new era of immunotherapy. More recently, chimeric antigen receptor (CAR) modified T cell, a novel cellular immunotherapy, has been developed for treatment of relapsed/refractory (RR) MM, and early phase clinical trials have shown promising efficacy of CAR T cell therapy. Many patients with end stage RRMM regard CAR T cell therapy as their “last chance” and a “hope of cure”. However, severe adverse events (AEs) and even toxic death related to CAR T cell therapy have been observed. The management of AEs related to CAR T cell therapy represents a new challenge, as the pathophysiology is not fully understood and there is still no well-established standard of management. With regard to CAR T cell associated toxicities in MM, in this review, we will provide an overview of experience from clinical trials, pathophysiology, and management strategies.
Published experience with carfilzomib in patients with relapsed/refractory multiple myeloma (RRMM) and extramedullary disease (EMD) is still limited. The current study aimed to assess the efficacy and safety of carfilzomib containing therapy regimens in EMD. We retrospectively analyzed 45 patients with extramedullary RRMM treated with carfilzomib from June 2013 to September 2019. The median age at the start of carfilzomib was 64 (range 40–80) years. Twenty (44%) and 25 (56%) patients had paraosseous manifestation and EMD without adjacency to bone, respectively. The serological overall response rate (ORR) was 59%. Extramedullary response was evaluable in 33 patients, nine (27%) of them achieved partial remission (PR) (ORR = 27%). In 15 (33%) patients, we observed no extramedullary response despite serological response. The median progression-free survival (PFS) and overall survival (OS) were five (95% CI, 3.5–6.5) and ten (95% CI, 7.5–12.5) months, respectively. EMD without adjacency to bone was associated with a significantly inferior PFS (p = 0.004) and OS (p = 0.04) compared to paraosseous lesions. Carfilzomib based treatment strategies showed some efficacy in heavily pretreated patients with extramedullary RRMM but could not overcome the negative prognostic value of EMD. Due to the discrepancy between serological and extramedullary response, evaluation of extramedullary response using imaging is mandatory in these patients.
Utilizing 18F-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET)/computed tomography (CT), we performed this pilot study to evaluate the link between cytogenetic/genomic markers and imaging patterns in relapsed/refractory (RR) multiple myeloma (MM). We retrospectively analyzed data of 24 patients with RRMM who were treated at our institution between November 2018 and February 2020. At the last relapse/progression, patients had been treated with a median of three (range 1–10) lines of therapy. Six (25%) patients showed FDG avid extramedullary disease without adjacency to bone. We observed significantly higher maximum standardized uptake values (SUV\(_{max}\)) in patients harboring del(17p) compared with those without del(17p) (p = 0.025). Moreover, a high SUV\(_{max}\) of >15 indicated significantly shortened progression-free survival (PFS) (p = 0.01) and overall survival (OS) (p = 0.0002). One female patient exhibited biallelic TP53 alteration, i.e., deletion and mutation, in whom an extremely high SUV\(_{max}\) of 37.88 was observed. In summary, this pilot study suggested a link between del(17p)/TP53 alteration and high SUV\(_{max}\) on 18F-FDG PET/CT in RRMM patients. Further investigations are highly warranted at this point.
This study aimed to explore the correlation between imaging patterns and clinical features in patients with smoldering multiple myeloma (SMM) who simultaneously underwent 18F-FDG, 11C-Methionine, and 68Ga-Pentixafor positron emission tomography/computed tomography (PET/CT). We retrieved and analyzed clinical characteristics and PET imaging data of 10 patients with SMM. We found a significant correlation between bone marrow (BM) plasma cell (PC) infiltration and mean standardized uptake values (SUV\(_{mean}\)) of lumbar vertebrae L2-L4 on 11C-Methionine PET/CT scans (r = 0.676, p = 0.031) and 68Ga-Pentixafor PET/CT scans (r = 0.839, p = 0.002). However, there was no significant correlation between BM involvement and SUV\(_{mean}\) of lumbar vertebrae L2-L4 on 18F-FDG PET/CT scans (r = 0.558, p = 0.093). Similarly, mean target-to-background ratios (TBR\(_{mean}\)) of lumbar vertebrae L2-L4 also correlated with bone marrow plasma cell (BMPC) infiltration in 11C-Methionine PET/CT (r = 0.789, p = 0.007) and 68Ga-Pentixafor PET/CT (r = 0.724, p = 0.018) PET/CT. In contrast, we did not observe a significant correlation between BMPC infiltration rate and TBR\(_{mean}\) in 18F-FDG PET/CT (r = 0.355, p = 0.313). Additionally, on 11C-Methionine PET/CT scans, we found a significant correlation between BMPC infiltration and TBR\(_{max}\) of lumbar vertebrae L2-L4 (r = 0.642, p = 0.045). In conclusion, 11C-Methionine and 68Ga-Pentixafor PET/CT demonstrate higher sensitivity than 18F-FDG PET/CT in detecting BM involvement in SMM.
Die Gottesknechtslieder gehören zu den Texten des Alten Testaments, die sehr häufig interpretiert worden sind. Das liegt zweifelsohne an der besonderen christlichen Rezeption, aber auch an der literaturgeschichtlichen und theologischen Bedeutung der Kapitel Jes 40–55. Eine weitere Studie dazu könnte in der Tat als Zeit- und Ressourcenverschwendung gewertet werden, wäre da nicht die theologisch herausragende Bedeutung der Gottesknechtslieder über den literarischen Horizont Deuterojesaja hinaus.
Spätestens seit den Arbeiten von Ulrich Berges steht die lange Zeit angenommene Eigenständigkeit der Textgruppe Gottesknechtslieder in Frage. Diese Sichtweise eröffnet einerseits die Möglichkeit, die Funktionalität der Lieder innerhalb Deuterojesajas neu zu beschreiben, andererseits vernachlässigt sie eine genauere Beschreibung der Funktion des Gottesknechts im historischen Kontext des zu Ende gehenden babylonischen Exils.
Diese Arbeit versucht mit den Methoden der historisch-kritischen Exegese zu rekonstruieren, wie eine prophetische Figur vom exilierten Teil Israels erwartet, als Gottesknecht zu wirken, aber zur Kenntnis nehmen muss, dass ihre Zeitgenossen dazu nicht bereit sind. Nach ihrem Scheitern, das in den Gottesknechtslieder verarbeitet ist, wird das prophetische Tun dieser Figur allerdings als Verwirklichung des Knechtsauftrags gedeutet. Die Besonderheit dieser Deutung des Knechtsauftrags im Kontext des Werkes Jes 40–55 liegt in seiner Erklärung des Leidens des Knechts: Der Knecht leidet wegen der Vergehen seiner Zeitgenossen. Innerhalb des alttestamentlichen Diskurses zum Problem der Theodizee liegt somit das Modell einer synchronen Schuldverkettung vor. Diese Bedeutung, die dem Tod des Knechts zugeschrieben wird, führt sogar im klassischen Tun-Ergehen-Zusammenhang zur Vorstellung eines guten Ergehens des Knechts im Jenseits. Die erste Vorstellung von Auferstehung kann somit im 4. Gottesknechtslied verortet werden.
Die Besonderheit des Knechtsauftrags zeigt eine weitere bedeutende theologische Weichenstellung im Alten Testament: Der Knechtsauftrag beinhaltet die Etablierung der göttlichen Rechts- und Heilsordnung für alle Nationen, dessen Licht der Knecht ist. Die Gottesknechtslieder sind also auch unverzichtbarer Bestandteil in der Wende zur Vorstellung eines Heilsuniversalismus. Diese Arbeit bietet demzufolge nicht nur eine Synthese der wichtigsten Forschungsfragen in Bezug auf die Gottesknechtslieder, sondern beschreibt ausführlich die Relevanz dieser Textzeugnisse innerhalb alttestamentlicher Theologie.
Marine organisms and their associated microbes are rich in diverse chemical leads. With the development of marine biotechnology, a considerable number of research activities are focused on marine bacteria and fungi-derived bioactive compounds. Marine bacteria and fungi are ranked on the top of the hierarchy of all organisms, as they are responsible for producing a wide range of bioactive secondary metabolites with possible pharmaceutical applications. Thus, they have the potential to provide future drugs against challenging diseases, such as cancer, a range of viral diseases, malaria, and inflammation. This review aims at describing the literature on secondary metabolites that have been obtained from Scleractinian-associated organisms including bacteria, fungi, and zooxanthellae, with full coverage of the period from 1982 to 2020, as well as illustrating their biological activities and structure activity relationship (SAR). Moreover, all these compounds were filtered based on ADME analysis to determine their physicochemical properties, and 15 compounds were selected. The selected compounds were virtually investigated for potential inhibition for SARS-CoV-2 targets using molecular docking studies. Promising potential results against SARS-CoV-2 RNA dependent RNA polymerase (RdRp) and methyltransferase (nsp16) are presented.
Die nicht-invasive Gefäßdiagnostik stellt einen wichtigen Pfeiler in der Prävention von Herz-Kreislauferkrankungen dar. Während lange Zeit die sonographische Messung der cIMT, als morphologisches Korrelat der Gefäßalterung, als Goldstandard galt, ist in den letzten Jahren in Gestalt der Pulswellenanalyse/PWV-Messung eine Technik weiterentwickelt worden, die, als funktionelles Korrelat der Gefäßalterung, aufgrund der leichteren Durchführbarkeit und geringerer Untersucherabhängigkeit und Kosten vielversprechend ist. So erlaubt die Messung der Pulswelle mittels gewöhnlicher Blutdruckmanschetten, genau wie die cIMT, die Berechnung des individuellen Gefäßalters und die Diagnostik für das Vorliegen eines Endorganschadens der Blutgefäße.
Um die Messergebnisse der beiden Untersuchungen miteinander zu vergleichen, wurden beide in der EUROASPIRE-IV Studie an Patienten mit koronarer Herzkrankheit durchgeführt. Die Auswertung der Messergebnisse der mit dem Vascular Explorer durchgeführten Pulswellenanalyse/PWV-Messung ergab überraschenderweise, dass die Mehrheit der herzkranken Patienten weder eine vaskuläre Voralterung noch einen Endorganschaden der Blutgefäße aufweisen. Im Falle der cIMT-Messung war Gegenteiliges der Fall, was trotz der medikamentösen Therapie der Patienten so zu erwarten war. Weiterhin zeigte sich lediglich eine geringe Korrelation zwischen den Messergebnissen beider Untersuchungen. Die Determinanten der einzelnen Messwerte aus cIMT und Pulswellenanalyse/PWV-Messung waren deckungsgleich mit den in der Literatur beschriebenen Faktoren, wenn auch viele der sonst signifikanten Regressoren das Signifikanzniveau in unserer Auswertung nicht unterschritten.
Eine Limitation der funktionellen Gefäßdiagnostik liegt derzeit darin, dass die Messergebnisse stark von dem verwendeten Messgerät abhängen. Es liegen noch zu wenig Vergleichsstudien vor, um die Messergebnisse, speziell von neueren Geräten wie dem Vascular Explorer, auf andere zu übertragen. Bei der Berechnung des Gefäßalters sollten daher optimalerweise gerätespezifische Normwerte vorliegen, was beim Vascular Explorer nicht der Fall ist. Gleiches gilt für die Verwendung des PWVcf-Grenzwerts für die Diagnose eines Endorganschadens der Blutgefäße.
Analog hat auch die Messung der cIMT gewisse Einschränkungen. So wäre eine weitere Standardisierung der Messorte (A. carotis communis vs Bulbus vs A. carotis interna), zwischen denen sich die durchschnittliche cIMT erheblich unterscheidet, sowie der Messparameter (Minimal- vs Maximal- vs Mittelwert) wünschenswert. Die universelle Anwendung eines cIMT-Grenzwerts zur Diagnose eines Endorganschadens der Blutgefäße ist daher kritisch zu sehen. Dies zeigt sich auch darin, dass in den neuesten Leitlinien der bislang geltende Grenzwert angezweifelt und kein aktuell gültiger Grenzwert mehr genannt wird.
Wir interpretieren unsere Ergebnisse dahingehend, dass unsere Messung der cIMT die zu erwartende pathologische Gefäßalterung bei Patienten mit koronarer Herzkrankheit besser widerspiegelt als die Messung der Pulswelle mit dem Vascular Explorer. Welche der beiden Untersuchungen hinsichtlich der prognostischen Wertigkeit überlegen ist, muss im Rahmen von Längsschnittstudien geklärt werden.
Purpose
To achieve a highly balanced comparison of trabecular bypass stenting (IS2, iStent inject) with ab interno trabeculectomy (T, Trabectome) by exact matching.
Methods
Fifty-three IS2 eyes were matched to 3446 T eyes. Patients were matched using exact matching by baseline intraocular pressure (IOP), the number of glaucoma medications, and glaucoma type, and using nearest neighbor matching by age. Individuals without a close match were excluded. All surgeries were combined with phacoemulsification.
Results
A total of 78 eyes (39 in each group) could be matched as exact pairs with a baseline IOP of 18.3 ± 5.1 mmHg and glaucoma medications of 2.7 ± 1.2 in each. IOP in IS2 was reduced to 14.6 ± 4.2 mmHg at 3 months and in T to a minimum of 13.1 ± 3.2 mmHg at 1 month. In IS2, IOP began to rise again at 6 months, eventually exceeding baseline. At 24 months, IOP in IS2 was 18.8 ± 9.0 mmHg and in T 14.2 ± 3.5 mmHg. IS2 had a higher average IOP than T at all postoperative visits (p < 0.05 at 1, 12, 18 months). Glaucoma medications decreased to 2.0 ± 1.5 in IS2 and to 1.5 ± 1.4 in T.
Conclusion
T resulted in a larger and sustained IOP reduction compared with IS2 where a rebound occurred after 6 months to slightly above preoperative values.
In der vorliegenden Studie wurde untersucht, ob laryngeale Konstriktionsphänomene regelhaft bei gesunden Säuglingen mit deutscher Umgebungssprache auftreten, ob es eine altersabhängige oder geschlechtsabhängige Entwicklung in der Auftrittshäufigkeit der Phänomene gibt und ob diese zusätzlich durch den Vokalisationstyp beeinflusst wird. Dazu wurden hier vier typische Vokalisationstypen im vorsprachlichen Alter definiert: spontanes Säuglingsweinen vor einer Mahlzeit in zwei Ausprägungsformen (Typ C und UC, letzterer als Typ weniger intensiven Säuglingsweinens) sowie Nichtschreivokalisationen in zwei Ausprägungsformen (UB: Übergangslaut zwischen UC und silbenartigem Vokalisieren (BB)).
In der vorliegenden Arbeit wurden solche Konstriktionsphänomene untersucht, die in der medizinischen Fachliteratur häufig mit pathologischen Zuständen der respiratorischen Regelung sowie Vokaltraktmalformationen bei Säuglingen mit Lippen-Kiefer-Gaumen-Segelspalten beschrieben werden. Es wurde hier untersucht, ob ähnliche Phänomene auch bei gesunden Säuglingen regelhaft auftreten.
Dazu wurde in einem kombinierten Längs- und Querschnittsdesign eine deskriptive Analyse von 20.406 Einzelvokalisationen von 20 Säuglingen in den ersten sieben Lebensmonaten vorgenommen. Die Vokalisationen lagen anonymisiert im Zentrum für vorsprachliche Entwicklung & Entwicklungsstörungen an der Poliklinik für Kieferorthopädie des Universitätsklinikums Würzburg vor. Es handelt sich um eine explorative, retrospektive Analyse.
Unter Verwendung von Frequenzspektren und Audiofiles wurden alle Einzelvokalisationen audio-visuell analysiert und drei Stufen mit unterschiedlicher Ausprägung der Konstriktionen einsortiert (Kategorie 1 – 3; Kategorie 0 = keine Konstriktionen in der Vokalisation). Die Kategoriendefinition wurde vom Autor der vorliegenden Arbeit in einer Voruntersuchung erarbeitet und durch weitere Kodierer getestet und als geeignet befunden.
Im Ergebnis der Arbeit konnte gezeigt werden, dass die hier untersuchten Konstriktionsphänomene regelhaft bei allen gesunden Säuglingen im Untersuchungszeitraum vorkommen. Die Auftrittshäufigkeit war dabei teilweise vom Geschlecht, vom Alter und vom Vokalisationstyp abhängig. Eine vergleichbare systematische Analyse lag bisher in der Literatur nicht vor. Die Ergebnisse werden aus physiologischer und linguistisch-phonetischer Perspektive interpretiert. Es konnte gezeigt werden, dass die im spontanen Weinen beobachteten Konstriktionsphänomene auch bei den Komfortvokalisationen (Nichtschreivokalisationen) vorkamen.
Dies stützt die Kontinuitätshypothese in der vorsprachlichen Entwicklung.
Die Arbeit hat auch widerlegt, dass alle Konstriktionsphänomene im Säuglingsweinen ein Pathologiemarker sind. Die Differenzierung zwischen physiologischen und pathologischen Konstriktionsphänomenen, die z.B. durch respiratorische Dysfunktion entstehen können (Stridor), ist eine Aufgabe für nachfolgende Arbeiten.
Für weiterführende Arbeiten mit dem Ziel der Anwendung von Stimmregisterphänomenen in der Vorsprachlichen Diagnostik sind methodisch erweiterte Ansätze bei gleichzeitig größerer Stichprobe erforderlich.
Folliculin Controls the Intracellular Survival and Trans-Epithelial Passage of Neisseria gonorrhoeae
(2020)
Neisseria gonorrhoeae, a Gram-negative obligate human pathogenic bacterium, infects human epithelial cells and causes sexually transmitted diseases. Emerging multi-antibiotic resistant gonococci and increasing numbers of infections complicate the treatment of infected patients. Here, we used an shRNA library screen and next-generation sequencing to identify factors involved in epithelial cell infection. Folliculin (FLCN), a 64 kDa protein with a tumor repressor function was identified as a novel host factor important for N. gonorrhoeae survival after uptake. We further determined that FLCN did not affect N. gonorrhoeae adherence and invasion but was essential for its survival in the cells by modulating autophagy. In addition, FLCN was also required to maintain cell to cell contacts in the epithelial layer. In an infection model with polarized cells, FLCN inhibited the polarized localization of E-cadherin and the transcytosis of gonococci across polarized epithelial cells. In conclusion, we demonstrate here the connection between FLCN and bacterial infection and in particular the role of FLCN in the intracellular survival and transcytosis of gonococci across polarized epithelial cell layers.
Chlamydia trachomatis (Ct) is an obligate intracellular human pathogen. It causes blinding trachoma and sexually transmitted disease such as chlamydia, pelvic inflammatory disease and lymphogranuloma venereum. Ct has a unique biphasic development cycle and replicates in an intracellular vacuole called inclusion. Normally it has two forms: the infectious form, elementary body (EB); and the non-infectious form, reticulate body (RB). Ct is not easily amenable to genetic manipulation. Hence, to understand the infection process, it is crucial to study how the metabolic activity of Ct exactly evolves in the host cell and what roles of EB and RB play differentially in Ct metabolism during infection. In addition, Ct was found regularly coinfected with other pathogens in patients who got sexually transmitted diseases (STDs). A lack of powerful methods to culture Ct outside of the host cell makes the detailed molecular mechanisms of coinfection difficult to study.
In this work, a genome-scale metabolic model with 321 metabolites and 277 reactions was first reconstructed by me to study Ct metabolic adaptation in the host cell during infection. This model was calculated to yield 84 extreme pathways, and metabolic flux strength was then modelled regarding 20hpi, 40hpi and later based on a published proteomics dataset. Activities of key enzymes involved in target pathways were further validated by RT-qPCR in both HeLa229 and HUVEC cell lines. This study suggests that Ct's major active pathways involve glycolysis, gluconeogenesis, glycerolphospholipid biosynthesis and pentose phosphate pathway, while Ct's incomplete tricarboxylic acid cycle and fatty acid biosynthesis are less active. EB is more activated in almost all these carbohydrate pathways than RB. Result suggests the survival of Ct generally requires a lot of acetyl-CoA from the host. Besides, both EB and RB can utilize folate biosynthesis to generate NAD(P)H but may use different pathways depending on the demands of ATP. When more ATP is available from both host cell and Ct itself, RB is more activated by utilizing energy providing chemicals generated by enzymes associated in the nucleic acid metabolism. The forming of folate also suggests large glutamate consumption, which is supposed to be converted from glutamine by the glutamine-fructose-6-phosphate transaminase (glmS) and CTP synthase (pyrG).
Then, RNA sequencing (RNA-seq) data analysis was performed by me in a coinfection study. Metatranscriptome from patient RNA-seq data provides a realistic overview. Thirteen patient samples were collected and sequenced by our collaborators. Six male samples were obtained by urethral swab, and seven female samples were collected by cervicovaginal lavage. All the samples were Neisseria gonorrhoeae (GC) positive, and half of them had coinfection with Ct. HISAT2 and Stringtie were used for transcriptomic mapping and assembly respectively, and differential expression analysis by DESeq2, Ballgown and Cuffdiff2 are parallelly processed for comparison. Although the measured transcripts were not sufficient to assemble Ct's transcriptome, the differential expression of genes in both the host and GC were analyzed by comparing Ct positive group (Ct+) against Ct-uninfected group. The results show that in the Ct+ group, the host MHC class II immune response was highly induced. Ct infection is associated with the regulation of DNA methylation, DNA double-strand damage and ubiquitination. The analysis also shows Ct infection enhances host fatty acid beta oxidation, thereby inducing mROS, and the host responds to reduce ceramide production and glycolysis. The coinfection upregulates GC's own ion transporters and amino acid uptake, while it downregulates GC's restriction and modification systems. Meanwhile, GC has the nitrosative and oxidative stress response and also increases the ability for ferric uptake especially in the Ct+ group compared to Ct-uninfected group.
In conclusion, methods in bioinformatics were used here in analyzing the metabolism of Ct itself, and the responses of the host and GC respectively in a coinfection study with and without Ct. These methods provide metabolic and metatranscriptomic details to study Ct metabolism during infection and Ct associated coinfection in the human microbiota.
3D cell culture models which closely resemble real human tissues are of high interest for disease modelling, drug screening as well as a deeper understanding of human developmental biology. Such structures are termed organoids. Within the last years, several human organoid models were described. These are usually stem cell derived, arise by self-organization, mimic mechanisms of normal tissue development, show typical organ morphogenesis and recapitulate at least some organ specific functions. Many tissues have been reproduced in vitro such as gut, liver, lung, kidney and brain. The resulting entities can be either derived from an adult stem cell population, or generated from pluripotent stem cells using a specific differentiation protocol. However, many organoid models only recapitulate the organs parenchyma but are devoid of stromal components such as blood vessels, connective tissue and inflammatory cells. Recent studies show that the incorporation of endothelial and mesenchymal cells into organoids improved their maturation and might be required to create fully functional micro-tissues, which will allow deeper insights into human embryogenesis as well as disease development and progression. In this review article, we will summarize and discuss recent works trying to incorporate stromal components into organoids, with a special focus on neural organoid models.
Aims
Chronic heart failure (CHF) can be caused by autoantibodies stimulating the heart via binding to first and/or second extracellular loops of cardiac β1-adrenoceptors. Allosteric receptor activation depends on conformational features of the autoantibody binding site. Elucidating these features will pave the way for the development of specific diagnostics and therapeutics. Our aim was (i) to fine-map the conformational epitope within the second extracellular loop of the human β\(_1\)-adrenoceptor (β1ECII) that is targeted by stimulating β\(_1\)-receptor (auto)antibodies and (ii) to generate competitive cyclopeptide inhibitors of allosteric receptor activation, which faithfully conserve the conformational auto-epitope.
Methods and results
Non-conserved amino acids within the β\(_1\)EC\(_{II}\) loop (compared with the amino acids constituting the ECII loop of the β\(_2\)-adrenoceptor) were one by one replaced with alanine; potential intra-loop disulfide bridges were probed by cysteine–serine exchanges. Effects on antibody binding and allosteric receptor activation were assessed (i) by (auto)antibody neutralization using cyclopeptides mimicking β1ECII ± the above replacements, and (ii) by (auto)antibody stimulation of human β\(_1\)-adrenoceptors bearing corresponding point mutations. With the use of stimulating β\(_1\)-receptor (auto)antibodies raised in mice, rats, or rabbits and isolated from exemplary dilated cardiomyopathy patients, our series of experiments unmasked two features of the β\(_1\)EC\(_{II}\) loop essential for (auto)antibody binding and allosteric receptor activation: (i) the NDPK\(^{211–214}\) motif and (ii) the intra-loop disulfide bond C\(^{209}\)↔C\(^{215}\). Of note, aberrant intra-loop disulfide bond C\(^{209}\)↔C\(^{216}\) almost fully disrupted the functional auto-epitope in cyclopeptides.
Conclusions
The conformational auto-epitope targeted by cardio-pathogenic β\(_1\)-receptor autoantibodies is faithfully conserved in cyclopeptide homologues of the β\(_1\)EC\(_{II}\) loop bearing the NDPK\(^{211–214}\) motif and the C\(^{209}\)↔C\(^{215}\) bridge while lacking cysteine C216. Such molecules provide promising tools for novel diagnostic and therapeutic approaches in β\(_1\)-autoantibodypositive CHF.
Die Entwicklung hochauflösender Fluoreszenzmikroskopiemethoden hat die Lichtmikroskopie revolutioniert. Einerseits ermöglicht die höhere erzielte räumliche Auflösung die Abbildung von Strukturen, die deutlich unterhalb der beugungsbedingten Auflösungsgrenze liegen. Andererseits erhält man durch Einzelmoleküllokalisationsmikroskopiemethoden
wie dSTORM (Direct Stochastic Optical Reconstruction Microscopy) Informationen, welche man für quantitative Analysen heranziehen kann. Aufgrund der sich dadurch bietenden neuen Möglichkeiten, hat sich die hochauflösende Fluoreszenzmikroskopie rasant entwickelt und kommt mittlerweile zur Untersuchung einer Vielzahl biologischer und medizinischer Fragestellungen zum Einsatz. Trotz dieses Erfolgs ist jedoch nicht zu verleugnen, dass auch diese neuen Methoden ihre Nachteile haben. Dazu zählt die Notwendigkeit relativ hoher Laserleistungen, welche Voraussetzung für hohe Auflösung ist und bei lebenden Proben zur Photoschädigung führen kann.
Diese Arbeit widmet sich sowohl dem Thema der Photoschädigung durch Einzelmoleküllokalisationsmikroskopie,
als auch der Anwendung von dSTORM und SIM (Structured Illumination Microscopy) zur Untersuchung neurobiologischer Fragestellungen auf Proteinebene.
Zur Ermittlung der Photoschädigung wurden lebende Zellen unter typischen Bedingungen bestrahlt und anschließend für 20−24 h beobachtet. Als quantitatives Maß für den Grad der Photoschädigung wurde der Anteil sterbender Zellen bestimmt. Neben der zu erwartenden Intensitäts- und Wellenlängenabhängigkeit, zeigte sich, dass die Schwere der Photoschädigung auch von vielen weiteren Faktoren abhängt und dass sich Einzelmoleküllokalisationsmikroskopie bei Berücksichtigung der gewonnenen Erkenntnisse durchaus mit Lebendzellexperimenten vereinbaren lässt.
Ein weiteres Projekt diente der Untersuchung der A- und B-Typ-Glutamatrezeptoren an der neuromuskulären Synapse von Drosophila melanogaster mittels dSTORM. Dabei konnte eine veränderte Anordnung beider Rezeptortypen infolge synaptischer Plastizität beobachtet, sowie eine absolute Quantifizierung des A-Typ-Rezeptors durchgeführt werden.
Im Mittelpunkt eines dritten Projekts standen Cadherin-13 (CDH13) sowie der Glucosetransporter Typ 3 (GluT3), welche beide mit der Aufmerksamkeitsdefizit-Hyperaktivitätsstörung in Verbindung gebracht werden. CDH13 konnte mittels SIM in serotonergen Neuronen, sowie radiären Gliazellen der dorsalen Raphekerne des embryonalen Mausgehirns nachgewiesen werden. Die Rolle von GluT3 wurde in aus induzierten pluripotenten Stammzellen differenzierten Neuronen analysiert, welche verschiedene Kopienzahlvariation des für GluT3-codierenden SLC2A3-Gens aufwiesen. Die Proteine GluT3, Bassoon und Homer wurden mittels dSTORM relativ quantifiziert. Während die Deletion des Gens zu einer erwartenden Verminderung von GluT3 auf Proteinebene führte, hatte die Duplikation keinen Effekt auf die GluT3-Menge. Für Bassoon und Homer zeigte sich weder durch die Deletion noch die Duplikation eine signifikante Veränderung.
Single molecule localization microscopy has seen a remarkable growth since its first
experimental implementations about a decade ago. Despite its technical challenges,
it is already widely used in medicine and biology and is valued as a unique tool
to gain molecular information with high specificity. However, common illumination techniques do not allow the use of single molecule sensitive super-resolution
microscopy techniques such as direct stochastic optical reconstruction microscopy
(dSTORM) for whole cell imaging. In addition, they can potentially alter the
quantitative information.
In this thesis, I combine dSTORM imaging in three dimensions with lattice lightsheet illumination to gain quantitative molecular information from cells unperturbed by the illumination and cover slip effects. Lattice light-sheet illumination
uses optical lattices for beam shaping to restrict the illumination to the detectable
volume. I describe the theoretical background needed for both techniques and detail
the experimental realization of the system as well as the software that I developed
to efficiently evaluate the data.
Eventually, I will present key datasets that demonstrate the capabilities of the
developed microscope system with and without dSTORM. My main goal here was
to use these techniques for imaging the neural cell adhesion molecule (NCAM, also
known as CD56) in whole cells. NCAM is a plasma membrane receptor known to
play a key role in biological processes such as memory and learning. Combining
dSTORM and lattice light-sheet illumination enables the collection of quantitative
data of the distribution of molecules across the whole plasma membrane, and shows
an accumulation of NCAM at cell-cell interfaces. The low phototoxicity of lattice
light-sheet illumination further allows for tracking individual NCAM dimers in living cells, showing a significant dependence of its mobility on the actin skeleton of
the cell.
Mass critical care caused by the severe acute respiratory syndrome corona virus 2 pandemic poses an extreme challenge to hospitals. The primary goal of hospital disaster preparedness and response is to maintain conventional or contingency care for as long as possible. Crisis care must be delayed as long as possible by appropriate measures. Increasing the intensive care unit (ICU) capacities is essential. In order to adjust surge capacity, the reduction of planned, elective patient care is an adequate response. However, this involves numerous problems that must be solved with a sense of proportion. This paper summarises preparedness and response measures recommended to acute care hospitals.
Purpose
Rescue missions during terrorist attacks are extremely challenging for all rescue forces (police as well as non-police forces) involved. To improve the quality and safety of the rescue missions during an active killing event, it is obligatory to adapt common rescue mission goals and strategies.
Methods
After the recent attacks in Europe, the Federal Office of Civil Protection and Disaster Assistance started an evaluation process on behalf of the Federal Ministry of the Interior and the Federal Ministry of Health. This was done to identify weaknesses, lessons learned and to formulate new adapted guidelines.
Results
The presented bullet point recommendations summarise the basic and most important results of the ongoing evaluation process for the Federal Republic of Germany. The safety of all the rescue forces and survival of the greatest possible number of casualties are the priority goals. Furthermore, the preservation and re-establishment of the socio-political integrity are the overarching goals of the management of active killing events. Strategic incident priorities are to stop the killing and to save as much lives as possible. The early identification and prioritised transportation of casualties with life-threatening non-controllable bleeding are major tasks and the shortest possible on-scene time is an important requirement with respect to safety issues.
Conclusion
With respect to hazard prevention tactics within Germany, we attributed the highest priority impact to the bullet points. The focus of the process has now shifted to intense work about possible solutions for the identified deficits and implementation strategies of such solutions during mass killing incidents.
Multifunctional calcium phosphate based coatings on titanium implants with integrated trace elements
(2020)
For decades, the main focus of titanium implants developed to restore bone functionality was on improved osseointegration. Additional antimicrobial properties have now become desirable, due to the risk that rising antibiotic resistance poses for implant-associated infections. To this end, the trace elements of copper and zinc were integrated into calcium phosphate based coatings by electrochemically assisted deposition. In addition to their antimicrobial activity, zinc is reported to attract bone progenitor cells through chemotaxis and thus increase osteogenic differentiation, and copper to stimulate angiogenesis. Quantities of up to 68.9 ± 0.1 μg cm\(^{-2}\) of copper and 56.6 ± 0.4 μg cm\(^{-2}\) of zinc were deposited; co-deposition of both ions did not influence the amount of zinc but slightly increased the amount of copper in the coatings. The release of deposited copper and zinc species was negligible in serum-free simulated body fluid. In protein-containing solutions, a burst release of up to 10 μg ml\(^{-1}\) was observed for copper, while zinc was released continuously for up to 14 days. The presence of zinc was beneficial for adhesion and growth of human mesenchymal stromal cells in a concentration-dependent manner, but cytotoxic effects were already visible for coatings with an intermediate copper content. However, co-deposited zinc could somewhat alleviate the adverse effects of copper. Antimicrobial tests with E. coli revealed a decrease in adherent bacteria on brushite without copper or zinc of 60%, but if the coating contained both ions there was almost no bacterial adhesion after 12 h. Coatings with high zinc content and intermediate copper content had the overall best multifunctional properties.
Bei Sportlern aber auch bei Nichtsportlern mit Bandläsionen im Bereich des Sprunggelenks ist die Bestimmung des Zeitpunktes der Wiederaufnahme sportlicher Aktivität von entscheidender Bedeutung – insbesondere um möglichen Folgeverletzungen in der Zukunft vorzubeugen.
Zur Beurteilung des richtigen Zeitpunkts zählt die Beurteilung der sportlichen Leistungsfähigkeit zu den wichtigsten Faktoren. Um diese Beurteilung vorzunehmen, ist das Vorhandensein von Referenzwerten für eine geeignete Testbatterie nötig.
Mit Hilfe der Ergebnisse dieser Arbeit sowie der gewählten Art der Darstellung kann so die Leistungsfähigkeit eines Probanden, welcher sich nicht im akuten Stadium einer Verletzung oder der direkt daran anschließenden Rekonvaleszens befindet, nach einer vorangegangenen Verletzung im Bereich des Sprunggelenks beurteilt werden. Ein adäquater Zeitpunkt zum Übergang von der Phase „Return to sports“ zu „Return to play“ beziehungsweise „Return to competition“ ohne das Risiko einer erneuten Verletzung kann so besser abgeschätzt werden.
Excitation energy transport in DNA modelled by multi-chromophoric field-induced surface hopping
(2020)
Absorption of ultraviolet light is known as a major source of carcinogenic mutations of DNA. The underlying processes of excitation energy dissipation are yet not fully understood. In this work we provide a new and generally applicable route for studying the excitation energy transport in multi-chromophoric complexes at an atomistic level. The surface-hopping approach in the frame of the extended Frenkel exciton model combined with QM/MM techniques allowed us to simulate the photodynamics of the alternating (dAdT)10 : (dAdT)10 double-stranded DNA. In accordance with recent experiments, we find that the excited state decay is multiexponential, involving a long and a short component which are due to two distinct mechanisms: formation of long-lived delocalized excitonic and charge transfer states vs. ultrafast decaying localized states resembling those of the bare nucleobases. Our simulations explain all stages of the ultrafast photodynamics including initial photoexcitation, dynamical evolution out of the Franck-Condon region, excimer formation and nonradiative relaxation to the ground state.
Die Phosphatase PDXP (auch bekannt als Chronophin) gehört zur Familie der HAD Phosphatasen, einer ubiquitär exprimierten Enzymklasse mit wichtigen physiologischen Funktionen. PDXP zeigt Phosphatase-Aktivität gegenüber seinem Substrat Pyridoxal 5´-Phosphat (PLP), der aktivierten Form von Vitamin B6. PDXP-defiziente Mäuse (Knockout-Mäuse) weisen im Vergleich zu Wildtypen verdoppelte PLP-Konzentrationen in Erythrozyten sowie im Gesamthirn auf. Vermutlich kommt PDXP daher eine wichtige Funktion in Erythrozyten und im Hirn zu. Ziel dieser Arbeit war es, erste Einblicke in diese Funktion(en) von PDXP zu erlangen.
Hierzu wurden HPLC-basierte Analysen der erythrozytären PLP-Konzentrationen in Wildtyp- sowie PDXP-defizienten Mäusen durchgeführt. Dabei ließen sich die rund doppelt so hohen erythrozytären PLP-Level in den KO-Mäusen bestätigen. Zudem ist es gelungen, eine Methode zur Messung der endogenen Phosphatase-Aktivität von PDXP in Erythrozytenlysaten zu etablieren. So konnte im Wildtyp anhand der Verringerung der PLP-Konzentrationen pro Zeiteinheit eine erythrozytäre PDXP-Aktivität nachgewiesen werden. Dazu waren die Inkubation mit Pyridoxin, sowie die Anwendung eines Inhibitors der PDXK notwendig. Eine bis dato vermutete Funktion der PDXP, zur Mobilisation von erythrozytärem PLP während Fastenzeiten, konnte ausgeschlossen werden. So zeigte der Vergleich der erythrozytären PLP-Konzentrationen aus gefasteten mit normal gefütterten Tieren in beiden Genotypen exakt dieselbe prozentuale PLP-Verringerung. Während Nahrungszufuhr ließ sich jedoch eine Funktion der Phosphatase PDXP als „Converter“ von Pyridoxin zu Pyridoxal erkennen. Ausgehend von PN konnte im Wildtyp (über die Zwischenprodukte PNP und PLP) eine PDXP-abhängige Dephosphorylierung von PLP zu PL erfolgen. So wies der Wildtyp eine rund vierfach höhere PL-Produktion auf, verglichen mit der PDXP-defizienten Maus. Die Phosphatase PDXP erwies sich als essenziell für die erythrozytäre Konversion von Pyridoxin zu Pyridoxal. Dadurch erreicht der Organismus eine metabolische Flexibilität, die ihn bis zu einem gewissen Grad unabhängig von der Nahrungsauswahl macht. Zudem können Zellen oder Organe, denen durch das Fehlen der PNPO, die Konversion zu PLP nicht möglich ist, mit PL versorgt werden.
Aus der hohen Reaktivität von PLP mit umliegenden Nucleophilen ergibt sich eine gewisse Problematik für die Zelle im Umgang mit freiem PLP. So liegt der Großteil des erythrozytären PLPs gebunden an Proteine (vor allem Hämoglobin) vor. Anhand von Filtern (MWCO, 3000) ließ sich zwischen der hier definiert als „freien“ und der „gebundenen“ Form von PLP differenzieren. So konnten erste Erkenntnisse zur Rolle von PDXP als Determinator freier PLP-Konzentrationen in Erythrozyten und insbesondere im Hippocampus erlangt werden. Im Hippocampus ergaben sich insgesamt deutlich höhere Konzentrationen an freiem PLP als in den Erythrozyten und es bestand zudem ein Unterschied zwischen den Genotypen. So wiesen die KO-Mäuse ~1/3 höhere freie PLP-Konzentrationen im Vergleich zu den Wildtypen auf. Schließlich konnte ein Effekt des Tieralters auf den PLP-Metabolismus festgestellt werden. Sowohl in den Erythrozyten als auch im Hippocampus ergaben sich alterskorrelierte Änderungen ihrer PLP-Konzentrationen. Zudem zeigten Western Blot Analysen altersbedingte Unterschiede ihrer Vitamin B6-Enzymexpressionen. So wiesen ältere Wildtypen im Hippocampus eine fünffach erhöhte PDXP-Expression verglichen mit jüngeren Tieren auf. In den Erythrozytenlysaten hingegen zeigten ältere Tiere beider Genotypen eine rund vierfach geringere PNPO-Expression gegenüber jüngeren Tieren. Die mit dem Alter eintretende physiologische Verringerung der erythrozytären PNPO-Expression würde somit für den Organismus einen Verlust seiner metabolischen Flexibilität bedeuten, die mit der Konversion von PN zu PL einhergeht.
Ziel der 6-monatigen Intervention Breakdance im Schulsport im Rahmen von "Sport nach 1" war es, Veränderungen bei physischen und psychosozialen Parametern zu betrachten. In einem Kontrollgruppendesign mit drei Messzeitpunkten wurden quantitative Methoden (motorische Tests, schriftliche Befragung) im Längsschnitt und qualitative Verfahren (mündliche Befragung) im Querschnitt am Ende des Untersuchungszeitraums eingesetzt. Mittels standardisierter Fragebögen wurden die Merkmale sportartspezifische- und allgemeine Selbstwirksamkeit sowie Kooperationsfähigkeit untersucht. Darüber hinaus wurde der Deutsche Motoriktest (DMT 6-18) durchgeführt, um die Entwicklung der Merkmale Kraftausdauer im Rumpf und den oberen Extremitäten, Schnellkraft in den Beinen, Koordination unter Präzisionsdruck sowie Koordination unter Zeitdruck zu betrachten.
This cumulative dissertation is organized as follows:
After the introduction, the second chapter, based on “Asymptotic independence of bivariate order statistics” (2017) by Falk and Wisheckel, is an investigation of the asymptotic dependence behavior of the components of bivariate order statistics. We find that the two components of the order statistics become asymptotically independent for certain combinations of (sequences of) indices that are selected, and it turns out that no further assumptions on the dependence of the two components in the underlying sample are necessary. To establish this, an explicit representation of the conditional distribution of bivariate order statistics is derived.
Chapter 3 is from “Conditional tail independence in archimedean copula models” (2019) by Falk, Padoan and Wisheckel and deals with the conditional distribution of an Archimedean copula, conditioned on one of its components. We show that its tails are independent under minor conditions on the generator function, even if the unconditional tails were dependent. The theoretical findings are underlined by a simulation study and can be generalized to Archimax copulas.
“Generalized pareto copulas: A key to multivariate extremes” (2019) by Falk, Padoan and Wisheckel lead to Chapter 4 where we introduce a nonparametric approach to estimate the probability that a random vector exceeds a fixed threshold if it follows a Generalized Pareto copula. To this end, some theory underlying the concept of Generalized Pareto distributions is presented first, the estimation procedure is tested using a simulation and finally applied to a dataset of air pollution parameters in Milan, Italy, from 2002 until 2017.
The fifth chapter collects some additional results on derivatives of D-norms, in particular a condition for the existence of directional derivatives, and multivariate spacings, specifically an explicit formula for the second-to-last bivariate spacing.
Design choices: Empirical recommendations for designing two-dimensional finger-tracking experiments
(2020)
The continuous tracking of mouse or finger movements has become an increasingly popular research method for investigating cognitive and motivational processes such as decision-making, action-planning, and executive functions. In the present paper, we evaluate and discuss how apparently trivial design choices of researchers may impact participants’ behavior and, consequently, a study’s results. We first provide a thorough comparison of mouse- and finger-tracking setups on the basis of a Simon task. We then vary a comprehensive set of design factors, including spatial layout, movement extent, time of stimulus onset, size of the target areas, and hit detection in a finger-tracking variant of this task. We explore the impact of these variations on a broad spectrum of movement parameters that are typically used to describe movement trajectories. Based on our findings, we suggest several recommendations for best practice that avoid some of the pitfalls of the methodology. Keeping these recommendations in mind will allow for informed decisions when planning and conducting future tracking experiments.
Comprehensive investigation in motor neuron disease is vital not to miss a treatable differential diagnosis. Neuroborreliosis should be considered during an ALS work‐up. However, false‐positive CSF results do occur, and thus, results should be interpreted carefully in context of all clinical test results.
Process model comprehension is essential in order to understand the five Ws (i.e., who, what, where, when, and why) pertaining to the processes of organizations. However, research in this context showed that a proper comprehension of process models often poses a challenge in practice. For this reason, a vast body of research exists studying the factors having an influence on process model comprehension. In order to point research towards a neuro-centric perspective in this context, the paper at hand evaluates the appropriateness of measuring the electrodermal activity (EDA) during the comprehension of process models. Therefore, a preliminary test run and a feasibility study were conducted relying on an EDA and physical activity sensor to record the EDA during process model comprehension. The insights obtained from the feasibility study demonstrated that process model comprehension leads to an increased activity in the EDA. Furthermore, EDA-related results indicated significantly that participants were confronted with a higher cognitive load during the comprehension of complex process models. In addition, the experiences and limitations we learned in measuring the EDA during the comprehension of process models are discussed in this paper. In conclusion, the feasibility study demonstrated that the measurement of the EDA could be an appropriate method to obtain new insights into process model comprehension.
The subject of this thesis is the fabrication and characterization of magnetic topological
insulator layers of (V,Bi,Sb)\(_2\)Te\(_3\) exhibiting the quantum anomalous Hall
effect. A major task was the experimental realization of the quantum anomalous
Hall effect, which is only observed in layers with very specific structural,
electronic and magnetic properties. These properties and their influence on the
quantum anomalous Hall effect are analyzed in detail.
First, the optimal conditions for the growth of pure Bi\(_2\)Te\(_3\) and Sb\(_2\)Te\(_3\) crystal
layers and the resulting structural quality are studied. The crystalline quality of
Bi\(_2\)Te\(_3\) improves significantly at higher growth temperatures resulting in a small
mosaicity-tilt and reduced twinning defects. The optimal growth temperature is
determined as 260\(^{\circ}\)C, low enough to avoid desorption while maintaining a high
crystalline quality.
The crystalline quality of Sb\(_2\)Te\(_3\) is less dependent on the growth temperature.
Temperatures below 230\(^{\circ}\)C are necessary to avoid significant material desorption,
though. Especially for the nucleation on Si(111)-H, a low sticking coefficient is
observed preventing the coalescence of islands into a homogeneous layer.
The influence of the substrate type, miscut and annealing sequence on the growth
of Bi\(_2\)Te\(_3\) layers is investigated. The alignment of the layer changes depending on
the miscut angle and annealing sequence: Typically, layer planes align parallel to
the Si(111) planes. This can enhance the twin suppression due to transfer of the
stacking order from the substrate to the layer at step edges, but results in a step
bunched layer morphology. For specific substrate preparations, however, the layer
planes are observed to align parallel to the surface plane. This alignment avoids
displacement at the step edges, which would cause anti-phase domains. This results
in narrow Bragg peaks in XRD rocking curve scans due to long-range order in
the absence of anti-phase domains. Furthermore, the use of rough Fe:InP(111):B
substrates leads to a strong reduction of twinning defects and a significantly reduced
mosaicity-twist due to the smaller lattice mismatch.
Next, the magnetically doped mixed compound V\(_z\)(Bi\(_{1−x}\)Sb\(_x\))\(_{2−z}\)Te\(_3\) is studied in
order to realize the quantum anomalous Hall effect. The addition of V and Bi to
Sb\(_2\)Te\(_3\) leads to efficient nucleation on the Si(111)-H surface and a closed, homogeneous
layer. Magneto-transport measurements of layers reveal a finite anomalous
Hall resistivity significantly below the von Klitzing constant. The observation of
the quantum anomalous Hall effect requires the complete suppression of parasitic
bulklike conduction due to defect induced carriers. This can be achieved by optimizing
the thickness, composition and growth conditions of the layers.
The growth temperature is observed to strongly influence the structural quality.
Elevated temperatures result in bigger islands, improved crystallographic orientation
and reduced twinning. On the other hand, desorption of primarily Sb is
observed, affecting the thickness, composition and reproducibility of the layers.
At 190\(^{\circ}\)C, desorption is avoided enabling precise control of layer thickness and
composition of the quaternary compound while maintaining a high structural
quality.
It is especially important to optimize the Bi/Sb ratio in the (V,Bi,Sb)\(_2\)Te\(_3\) layers,
since by alloying n-type Bi\(_2\)Te\(_3\) and p-type Sb\(_2\)Te\(_3\) charge neutrality is achieved at
a specific mixing ratio. This is necessary to shift the Fermi level into the magnetic
exchange gap and fully suppress the bulk conduction. The Sb content x furthermore
influences the in-plane lattice constant a significantly. This is utilized to
accurately determine x even for thin films below 10 nm thickness required for the
quantum anomalous Hall effect. Furthermore, x strongly influences the surface
morphology: with increasing x the island size decreases and the RMS roughness
increases by up to a factor of 4 between x = 0 and x = 1.
A series of samples with x varied between 0.56-0.95 is grown, while carefully
maintaining a constant thickness of 9 nm and a doping concentration of 2 at.% V.
Magneto-transport measurements reveal the charge neutral point around x = 0.86
at 4.2 K. The maximum of the anomalous Hall resistivity of 0.44 h/e\(^2\) is observed
at x = 0.77 close to charge neutrality. Reducing the measurement temperature
to 50 mK significantly increases the anomalous Hall resistivity. Several samples
in a narrow range of x between 0.76-0.79 show the quantum anomalous Hall effect
with the Hall resistivity reaching the von Klitzing constant and a vanishing
longitudinal resistivity. Having realized the quantum anomalous Hall effect as the
first group in Europe, this breakthrough enabled us to study the electronic and
magnetic properties of the samples in close collaborations with other groups.
In collaboration with the Physikalisch-Technische Bundesanstalt high-precision
measurements were conducted with detailed error analysis yielding a relative de-
viation from the von Klitzing constant of (0.17 \(\pm\) 0.25) * 10\(^{−6}\). This is published
as the smallest, most precise value at that time, proving the high quality of the
provided samples. This result paves the way for the application of magnetic topological
insulators as zero-field resistance standards.
Non-local magneto-transport measurements were conducted at 15 mK in close
collaboration with the transport group in EP3. The results prove that transport
happens through chiral edge channels. The detailed analysis of small anomalies in
transport measurements reveals instabilities in the magnetic phase even at 15 mK.
Their time dependent nature indicates the presence of superparamagnetic contributions
in the nominally ferromagnetic phase.
Next, the influence of the capping layer and the substrate type on structural properties
and the impact on the quantum anomalous Hall effect is investigated. To
this end, a layer was grown on a semi-insulating Fe:InP(111)B substrate using the
previously optimized growth conditions. The crystalline quality is improved significantly
with the mosaicity twist reduced from 5.4\(^{\circ}\) to 1.0\(^{\circ}\). Furthermore, a layer
without protective capping layer was grown on Si and studied after providing sufficient
time for degradation. The uncapped layer on Si shows perfect quantization,
while the layer on InP deviates by about 5%. This may be caused by the higher
crystalline quality, but variations in e.g. Sb content cannot be ruled out as the
cause. Overall, the quantum anomalous Hall effect seems robust against changes
in substrate and capping layer with only little deviations.
Furthermore, the dependence of the quantum anomalous Hall effect on the thickness
of the layers is investigated. Between 5-8 nm thickness the material typically
transitions from a 2D topological insulator with hybridized top and bottom surface
states to a 3D topological insulator. A set of samples with 6 nm, 8 nm, and
9 nm thickness exhibits the quantum anomalous Hall effect, while 5 nm and 15 nm
thick layers show significant bulk contributions. The analysis of the longitudinal
and Hall conductivity during the reversal of magnetization reveals distinct differences
between different thicknesses. The 6 nm thick layer shows scaling consistent
with the integer quantum Hall effect, while the 9 nm thick layer shows scaling expected
for the topological surface states of a 3D topological insulator. The unique
scaling of the 9 nm thick layer is of particular interest as it may be a result of
axion electrodynamics in a 3D topological insulator.
Subsequently, the influence of V doping on the structural and magnetic properties
of the host material is studied systematically. Similarly to Bi alloying, increased
V doping seems to flatten the layer surface significantly. With increasing V content,
Te bonding partners are observed to increase simultaneously in a 2:3 ratio
as expected for V incorporation on group-V sites. The linear contraction of the
in-plane and out-of-plane lattice constants with increasing V doping is quantitatively
consistent with the incorporation of V\(^{3+}\) ions, possibly mixed with V\(^{4+}\)
ions, at the group-V sites. This is consistent with SQUID measurements showing
a magnetization of 1.3 \(\mu_B\) per V ion.
Finally, magnetically doped topological insulator heterostructures are fabricated
and studied in magneto-transport. Trilayer heterostructures with a non-magnetic
(Bi,Sb)\(_2\)Te\(_3\) layer sandwiched between two magnetically doped layers are predicted
to host the axion insulator state if the two magnetic layers are decoupled and in
antiparallel configuration. Magneto-transport measurements of such a trilayer heterostructure
with 7 nm undoped (Bi,Sb)\(_2\)Te\(_3\) between 2 nm thick layers doped with
1.5 at.% V exhibit a zero Hall plateau representing an insulating state. Similar results
in the literature were interpreted as axion insulator state, but in the absence
of a measurement showing the antiparallel magnetic orientation other explanations
for the insulating state cannot be ruled out.
Furthermore, heterostructures including a 2 nm thin, highly V doped layer region
show an anomalous Hall effect of opposite sign compared to previous samples. A
dependency on the thickness and position of the doped layer region is observed,
which indicates that scattering at the interfaces causes contributions to the anomalous
Hall effect of opposite sign compared to bulk scattering effects.
Many interesting phenomena in quantum anomalous Hall insulators as well as axion
insulators are still not unambiguously observed. This includes Majorana bound
states in quantum anomalous Hall insulator/superconductor hybrid systems and
the topological magneto-electric effect in axion insulators. The limited observation
temperature of the quantum anomalous Hall effect of below 1 K could be increased
in 3D topological insulator/magnetic insulator heterostructures which utilize the
magnetic proximity effect.
The main achievement of this thesis is the reproducible growth and characterization
of (V,Bi,Sb)2Te3 layers exhibiting the quantum anomalous Hall effect. The
detailed study of the structural requirements of the quantum anomalous Hall effect
and the observation of the unique axionic scaling behavior in 3D magnetic
topological insulator layers leads to a better understanding of the nature of this
new quantum state. The high-precision measurements of the quantum anomalous
Hall effect reporting the smallest deviation from the von Klitzing constant
are an important step towards the realization of a zero-field quantum resistance
standard.
This thesis contributes to the understanding of the labor market effects of international trade, with a focus on the effects on wage and earnings inequality. The thesis draws on high-quality micro data and applies modern econometric techniques and theoretical concepts to improve our understanding of the distributional effects of international trade. The thesis focuses on the effects in Germany and the USA.
Investigation of processes that contribute to the maintenance of genomic stability is one crucial factor in the attempt to understand mechanisms that facilitate ageing. The DNA damage response (DDR) and DNA repair mechanisms are crucial to safeguard the integrity of DNA and to prevent accumulation of persistent DNA damage. Among them, base excision repair (BER) plays a decisive role. BER is the major repair pathway for small oxidative base modifications and apurinic/apyrimidinic (AP) sites. We established a highly sensitive non-radioactive assay to measure BER incision activity in murine liver samples. Incision activity can be assessed towards the three DNA lesions 8-oxo-2'-deoxyguanosine (8-oxodG), 5-hydroxy-2'-deoxyuracil (5-OHdU), and an AP site analogue. We applied the established assay to murine livers of adult and old mice of both sexes. Furthermore, poly(ADP-ribosyl)ation (PARylation) was assessed, which is an important determinant in DDR and BER. Additionally, DNA damage levels were measured to examine the overall damage levels. No impact of ageing on the investigated endpoints in liver tissue were found. However, animal sex seems to be a significant impact factor, as evident by sex-dependent alterations in all endpoints investigated. Moreover, our results revealed interrelationships between the investigated endpoints indicative for the synergetic mode of action of the cellular DNA integrity maintaining machinery.
Zeitliche Diskrimination somatosensorischer und kinästhetischer Stimuli wurde als neurophysiologisches Korrelat für propriozeptive Präzision postuliert und bei verschiedenen Bewegungsstörungen als pathologisch beschrieben. Ziel der Untersuchung war es, den Einfluss von Alter und Polyneuropathie auf die kinästhetische (TDMT) und taktile (STDT) zeitliche Wahrnehmungsschwelle sowie die propriozeptive Genauigkeit bei Zeigeversuchen systematisch zu untersuchen.
Hierfür wurden 54 gesunde Probanden und 25 Polyneuropathie-Patienten im Alter zwischen 30 und 76 Jahren untersucht. Die STDT-Messung erfolgte mit Oberflächenelektroden, die an der Zeigefingerspitze bzw. am Großzehengrundgelenk angebracht wurden. Die TDMT-Werte wurden mit Hilfe einer sterilen Nadelelektrode erfasst, welche in den Musculus flexor carpi radialis bzw. Musculus tibialis anterior inseriert wurde.
Die Daten zur Propriozeption wurden mit Hilfe eines Goniometers erhoben und beinhalteten dabei aktive Zeigeaufgaben (Zeigen auf eine LED, Nachahmung einer Bewegung anhand einer auf einem Computerbildschirm dargebotenen PFEIL-Darstellung unterschiedlicher Länge) und die Einschätzung der Position der jeweiligen Extremität nach passiver Bewegung (PASSIV). Die Messungen erfolgten jeweils ohne visuelle Rückmeldung. Die Zeigefehler (Abweichung von der Zielposition) bzw. Schätzfehler (Abweichung der geschätzten von der tatsächlichen Position nach passiver Auslenkung) wurden als Maß der propriozeptiven Präzision verwendet.
Die Ergebnisse der gesunden Probandengruppe zeigten, dass höheres Alter mit höheren STDT- und TDMT-Werten korrelierte. Die Polyneuropathie-Patienten erzielten in allen Bereichen (Diskriminationsschwellen und Propriozeptionsaufgaben) signifikant schlechtere Ergebnisse als die gesunde Kontrollgruppe.
Zusätzlich konnte eine statistisch signifikante positive Korrelation zwischen der propriozeptiven Präzision bei den aktiven Zeige-Aufgaben (LED und PFEIL) und den zeitlichen Diskriminationsschwellen (STDT und TDMT) gezeigt werden.
In Anbetracht dieser Ergebnisse sollten das Patienten-Alter und mögliche Störungen der peripheren Nervenleitung berücksichtigt werden, wenn STDT-und TDMT-Bestimmungen bei Patienten mit Bewegungsstörungen angewendet werden. Die Korrelation zwischen den Diskriminationsschwellen und der Performance bei aktiven Zeigeversuchen (PFEIL- und LED-Aufgabe) legt nahe, dass STDT und TDMT Indikatoren der propriozeptiven Funktion sein könnten. Es ist weitere Forschungsarbeit notwendig, um diese Beziehung exakt zu beleuchten. Im Falle einer Bestätigung der Befunde auch bei Patienten mit Bewegungsstörungen erscheint denkbar, dass sich STDT und TDMT als vergleichsweise leicht messbare und gut quantifizierbare Parameter der Propriozeption herausstellen mit Potenzial zur differenzialdiagnostischen Anwendung, möglicherweise aber auch als Surrogatparameter einer gezielten rehabilitativen Behandlung.
Die E-Zigarette gewinnt in den letzten Jahren immer mehr an Popularität. Die Frage der Toxizität ist jedoch noch nicht abschließend geklärt, und es besteht weltweite Unsicherheit bei der Verwendung der E-Zigarette.
Die vorliegende Arbeit untersucht menschliche Nasenschleimhautzellen nach Dampfexposition mit Propylenglykol, einem Hauptbestandteil der Liquide, auf mögliche akute Entzündungsreaktionen, zytotoxische und genotoxische Wirkungen.
Die Nasenschleimhautzellen von 10 Probanden wurden im Air-Liquid-Interface kultiviert und anschließend verschiedenen Konzentrationen von Propylenglykol ausgesetzt. Die Analyse erfolgte unter Verwendung eines Trypanblau-Tests, eines Comet-Assays, eines Mikrokern-Tests und eines IL-6- und IL-8-Sandwich-ELISAs.
Der Trypanblau-Test zeigte keine Reduktion der Vitalität. Im Sandwich-ELISA konnte kein Anstieg der IL-6- und IL-8-Konzentrationen festgestellt werden. Im Comet-Assay zeigte das Olive Tail Moment in allen untersuchten Konzentrationen eine Schädigung im Vergleich zur Negativkontrolle. Es zeigte sich auch eine dosisabhängige Schädigung. Ein Unterschied zwischen der Reinsubstanz und der Negativkontrolle konnte im Mikrokern-Test festgestellt werden.
Es wurden reparierbare Schäden im Comet-Assay gefunden. Im Mikrokern-Test konnten diese nur in der Reinsubstanzkonzentration bestätigt werden. Die E-Zigarette sollte restriktiv verwendet werden, bis Langzeitstudien vorliegen. Darüber hinaus sollten die Hersteller die Inhaltsstoffe der Flüssigkeiten eindeutig angeben.
In reconstructive and plastic surgery, there exists a growing demand of adequate tissue implants, since currently available strategies for autologous transplantation are limited by complications including transplant failure and donor site morbidity. By developing in vitro and in vivo autologous substitutes for defective tissue sites, adipose tissue engineering can address these challenges, although there are several obstacles to overcome. One of the major limitations is the sufficient vascularization of in vitro engineered large constructs that remains crucial and demanding for functional tissues. Decellularized jejunal segments may represent a suitable scaffolding system with preexisting capillary structures that can be repopulated with human microvascular endothelial cells (hMVECs), and a luminal matrix applicable for the adipogenic differentiation of human adipose-derived stem cells (hASCs). Hence, co-culture of these cells in jejunal segments, utilizing a custom-made bioreactor system, was characterized in terms of vascularization and adipose tissue development. Substantial adipogenesis of hASCs was demonstrated within the jejunal lumen in contrast to non-induced controls, and the increase of key adipogenic markers was verified over time upon induction. The development of major extracellular matrix components of mature adipose tissue, such as laminin and collagen IV, was shown within the scaffold in induced samples. Successful reseeding of the vascular network with hMVECs was demonstrated in long-term culture and co-localization of vascular structures and adipogenically differentiated hASCs was observed. Therefore, these results represent a novel approach for in vitro engineering of vascularized adipose tissue constructs that warrants further investigations in preclinical studies.
Another still existing obstacle in adipose tissue engineering is the insufficient knowledge about the applied cells, for instance the understanding of how cells can be optimally expanded and differentiated for successful engineering of tissue transplants. Even though hASCs can be easily isolated from liposuction of abdominal fat depots, yielding low donor site morbidity, huge numbers of cells are required to entirely seed complex and large 3D matrices or scaffolds. Thus, cells need to be large-scale expanded in vitro on the premise of not losing their differentiation capacity caused by replicative aging. Accordingly, an improved differentiation of hASCs in adipose tissue engineering approaches remains still desirable since most engineered constructs exhibit an inhomogeneous differentiation pattern. For mesenchymal stem cells (MSCs), it has been shown that growth factor application can lead to a significant improvement of both proliferation and differentiation capacity. Especially basic fibroblast growth factor (bFGF) represents a potent mitogen for MSCs, while maintaining or even promoting their osteogenic, chondrogenic and adipogenic differentiation potential. As there are currently different contradictory information present in literature about the applied bFGF concentration and the explicit effect of bFGF on ASC differentiation, here, the effect of bFGF on hASC proliferation and differentiation capacity was investigated at different concentrations and time points in 2D culture. Preculture of hASCs with bFGF prior to adipogenic induction showed a remarkable effect, whereas administration of bFGF during culture did not improve adipogenic differentiation capacity. Furthermore, the observations indicated as mode of action an impact of this preculture on cell proliferation capacity, resulting in increased cellular density at the time of adipogenic induction. The difference in cell density at this time point appeared to be pivotal for increased adipogenic capacity of the cells, which was confirmed in a further experiment employing different seeding densities. Interestingly, furthermore, the obtained results suggested a cell-cell contact-mediated mechanism positively influencing adipogenic differentiation. As a consequence, subsequently, studies were conducted focusing on intercellular communication of these cells, which has hardly been investigated to date.
Despite the multitude of literature on the differentiation capacity of ASCs, little is reported about the physiological properties contributing to and controlling the process of lineage differentiation. Direct intercellular communication between adjacent cells via gap junctions has been shown to modulate differentiation processes in other cell types, with connexin 43 (Cx43) being the most abundant isoform of the gap junction-forming connexins. Thus, in the present study we focused on the expression of Cx43 and gap junctional intercellular communication (GJIC) in hASCs, and its significance for adipogenic differentiation of these cells. Cx43 expression in hASCs was demonstrated histologically and on the gene and protein expression level and was shown to be greatly positively influenced by cell seeding density. Functionality of gap junctions was proven by dye transfer analysis in growth medium. Adipogenic differentiation of hASCs was shown to be also distinctly elevated at higher cell seeding densities. Inhibition of GJIC by 18α-glycyrrhetinic acid significantly compromised adipogenic differentiation, as demonstrated by histology, triglyceride quantification, and adipogenic marker gene expression. Flow cytometry analysis showed a lower proportion of cells undergoing adipogenesis when GJIC was inhibited, further indicating the importance of GJIC in the differentiation process. Altogether, these results demonstrate the impact of direct cell-cell communication via gap junctions on the adipogenic differentiation process of hASCs and may contribute to further integrate direct intercellular crosstalk in rationales for tissue engineering approaches.
Die Studie befasste sich mit den Veränderungen des oralen Mikrobioms bei Patienten, die mit einer herausnehmbaren oder festsitzenden kieferorthopädischen Apparatur behandelt wurden. Während des sechsmonatigen Studienzeitraums wurden 25 Probanden hinsichtlich Streptococcus mutans und Lactobacillus mit dem CRT bacteria Test der Firma Ivoclar Vivadent untersucht. Abgesehen davon wurde ihre gingivale Gesundheit mittels Approximalraum-Plaque Index nach Saxer und Mühlemann und Papillenblutungsindex nach Lange et. al. ermittelt.
Fahrzeughersteller haben die Verfügbarkeit sogenannter hochautomatisierter Fahrfunktionen (SAE Level 3; SAE, 2018) in ihren Modellen angekündigt. Hierdurch wird der Fahrer in der Lage sein, sich permanent von der Fahraufgabe abzuwenden und fahrfremden Tätigkeiten nachzugehen. Allerdings muss er immer noch als Rückfallebene zur Verfügung stehen, um im Fall von Systemgrenzen oder -fehlern (siehe Gold, Naujoks, Radlmayr, Bellem & Jarosch, 2017), die Fahrzeugkontrolle zu übernehmen. Das Übernahmeerfordernis wird dem Fahrer durch die Ausgabe einer Übernameaufforderung vermittelt. Die Übernahme der manuellen Fahrzeugführung aus dem hochautomatisierten Fahren stellt aus psychologischer Sicht einen Aufgabenwechsel dar. Bei der Untersuchung von Aufgabenwechseln im Bereich der kognitiven und angewandten Psychologie zeigte sich vielfach, dass Aufgabenwechsel mit verlängerten Reaktionszeiten und erhöhten Fehlerraten assoziiert sind. Für den Anwendungsfall des automatisierten Fahrens liegen ebenfalls eine Reihe empirischer Studien vor, die darauf hinweisen, dass der Wechsel zum manuellen Fahren mit einer Verschlechterung der Fahrleistung gegenüber dem manuellen Fahren verbunden ist. Da Erkenntnisse vorliegen, dass eine Vorbereitung auf den Aufgabenwechsel die zu erwartenden Kosten verringern kann, ist das Ziel dieser Arbeit die Konzeption und empirische Evaluation einer Mensch-Maschine-Schnittstelle, die Nutzer hochautomatisierter Fahrzeuge durch frühzeitige Vorinformationen über Systemgrenzen auf die Kontrollübernahme vorbereitet.
Drei Experimente im Fahrsimulator mit Bewegungssystem betrachteten jeweils unterschiedliche Aspekte frühzeitiger Vorinformationen über bevorstehende Übernahmen. Das erste Experiment untersuchte, ob Fahrer überhaupt von frühzeitigen Situationsankündigungen, beispielsweise im Sinne einer verbesserten Übernahmeleistung, profitieren. Das zweite Experiment befasste sich mit der Frage, wie solche Ankündigungen zeitlich und inhaltlich zu gestalten sind (d. h. wann sie präsentiert werden und welche Informationen sie enthalten sollten), und welchen Einfluss deren Gestaltung auf die Aufgabenbearbeitung (insbesondere deren Unterbrechung und spätere Wiederaufnahme) während der automatisierten Fahrt hat. Um herauszufinden, wie ein Anzeigekonzept zur längerfristigen Planung von fahrfremden Tätigkeiten während des automatisierten Fahrens beitragen könnte, fand im dritten Experiment ein Vergleich von Situationsankündigungen, die vor dem Erreichen einer Übernahmesituation ausgegeben wurden, mit kontinuierlich präsentierten Informationen über die verbleibende Distanz zur nächsten Systemgrenze statt. In allen Studien wurde neben den Auswirkungen frühzeitiger Vorinformationen auf die Übernahmeleistung und Bearbeitung von fahrfremden Tätigkeiten auch untersucht, welche Auswirkungen ein erweitertes Übernahmekonzept auf die Fahrerreaktion in Grenz- und Fehlerfällen, in denen Vorinformationen entweder nicht oder fehlerhaft angezeigt wurden, hat.
Für die Gestaltung zukünftiger Übernahmekonzepte für hochautomatisierte Fahrzeuge kann basierend auf den Ergebnissen empfohlen werden, frühzeitige Anzeigen von Systemgrenzen zur Ermöglichung eines sicheren und komfortablen Wechsels zwischen dem manuellen und dem automatisierten Fahren in die Mensch-Maschine-Schnittstelle zu integrieren. Basierend auf den Ergebnissen dieser Arbeit liegt der empfohlene Zeitpunkt für diskrete Ankündigungen bei einer Reisegeschwindigkeit von 120 km/h bei etwa 1000 Meter (d. h. ca. 30 Sekunden) vor der Ausgabe der Übernahmeaufforderung. Zudem wird empfohlen zur Abschätzung der verbleibenden Zeit im automatisierten Modus eine Anzeige der Entfernung zur nächsten Systemgrenze in das Konzept zu integrieren, die dem Fahrer eine längerfristige Aufgabenplanung ermöglicht. Neben der reinen Anzeige des Übernahmeerfordernisses sollten dem Fahrer auch Informationen über das erforderliche Fahrmanöver nach der Kontrollübernahme übermittelt werden.
In recent years, great progress has been made in the area of Artificial Intelligence (AI) due to the possibilities of Deep Learning which steadily yielded new state-of-the-art results especially in many image recognition tasks.
Currently, in some areas, human performance is achieved or already exceeded.
This great development already had an impact on the area of Optical Music Recognition (OMR) as several novel methods relying on Deep Learning succeeded in specific tasks.
Musicologists are interested in large-scale musical analysis and in publishing digital transcriptions in a collection enabling to develop tools for searching and data retrieving.
The application of OMR promises to simplify and thus speed-up the transcription process by either providing fully-automatic or semi-automatic approaches.
This thesis focuses on the automatic transcription of Medieval music with a focus on square notation which poses a challenging task due to complex layouts, highly varying handwritten notations, and degradation.
However, since handwritten music notations are quite complex to read, even for an experienced musicologist, it is to be expected that even with new techniques of OMR manual corrections are required to obtain the transcriptions.
This thesis presents several new approaches and open source software solutions for layout analysis and Automatic Text Recognition (ATR) for early documents and for OMR of Medieval manuscripts providing state-of-the-art technology.
Fully Convolutional Networks (FCN) are applied for the segmentation of historical manuscripts and early printed books, to detect staff lines, and to recognize neume notations.
The ATR engine Calamari is presented which allows for ATR of early prints and also the recognition of lyrics.
Configurable CNN/LSTM-network architectures which are trained with the segmentation-free CTC-loss are applied to the sequential recognition of text but also monophonic music.
Finally, a syllable-to-neume assignment algorithm is presented which represents the final step to obtain a complete transcription of the music.
The evaluations show that the performances of any algorithm is highly depending on the material at hand and the number of training instances.
The presented staff line detection correctly identifies staff lines and staves with an $F_1$-score of above $99.5\%$.
The symbol recognition yields a diplomatic Symbol Accuracy Rate (dSAR) of above $90\%$ by counting the number of correct predictions in the symbols sequence normalized by its length.
The ATR of lyrics achieved a Character Error Rate (CAR) (equivalently the number of correct predictions normalized by the sentence length) of above $93\%$ trained on 771 lyric lines of Medieval manuscripts and of 99.89\% when training on around 3.5 million lines of contemporary printed fonts.
The assignment of syllables and their corresponding neumes reached $F_1$-scores of up to $99.2\%$.
A direct comparison to previously published performances is difficult due to different materials and metrics.
However, estimations show that the reported values of this thesis exceed the state-of-the-art in the area of square notation.
A further goal of this thesis is to enable musicologists without technical background to apply the developed algorithms in a complete workflow by providing a user-friendly and comfortable Graphical User Interface (GUI) encapsulating the technical details.
For this purpose, this thesis presents the web-application OMMR4all.
Its fully-functional workflow includes the proposed state-of-the-art machine-learning algorithms and optionally allows for a manual intervention at any stage to correct the output preventing error propagation.
To simplify the manual (post-) correction, OMMR4all provides an overlay-editor that superimposes the annotations with a scan of the original manuscripts so that errors can easily be spotted.
The workflow is designed to be iteratively improvable by training better models as soon as new Ground Truth (GT) is available.