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By introduction of four hydroxy (HO) groups into the two perylene bisimide (PBI) bay areas, new HO‐PBI ligands were obtained which upon deprotonation can complex ZnII ions and photosensitize semiconductive zinc oxide thin films. Such coordination is beneficial for dispersing PBI photosensitizer molecules evenly into metal oxide films to fabricate organic–inorganic hybrid interlayers for organic solar cells. Supported by the photoconductive effect of the ZnO:HO‐PBI hybrid interlayers, improved electron collection and transportation is achieved in fullerene and non‐fullerene polymer solar cell devices, leading to remarkable power conversion efficiencies of up to 15.95 % for a non‐fullerene based organic solar cell.
T-Zell-Charakterisierung im peripheren Blut bei Kindern mit chronisch entzündlichen Darmerkrankungen
(2019)
Die Inzidenz von chronisch entzündlichen Darmerkrankungen (CED), insbesondere von Morbus Crohn (MC), nimmt weltweit zu, was auch eine Vielzahl an Kindern betrifft. Obwohl die Krankheit in den letzten Jahrzehnten Gegenstand zahlreicher Forschungsarbeiten war, ist die Pathogenese nicht abschließend geklärt.
Diese Arbeit vergleicht T-Zellen gesunder pädiatrischer Probanden mit T-Zellen pädiatrischer CED Patienten mittels Flowcytometrie unter Berücksichtigung von Differenzierungsstadium, Krankheitsaktivität, Therapie und CMV-Status.
Die Verteilung der T-Zell-Subpopulationen zeigt keine signifikanten Unterschiede zwischen Patienten und Kontrollen, jedoch zeigen sich für TH1 und TH17 Zellen Unterschiede zwischen MC Patienten und Kontrollen, welche auch mit Krankheitsaktivität und Therapie korrelieren. Der Anteil von CXCR3+ Zellen ist innerhalb der CD4+ Memory-Populationen und innerhalb der CD8+ Memory- und Effektor-Populationen bei MC Patienten – vor allem mit aktiver Erkrankung bzw. ohne Therapie – deutlich geringer als bei Kontrollen. Gleichzeitig zeigt sich der Anteil an CCR6+ Zellen sowie der Anteil an IL 17+CCR6+ Zellen bei MC Patienten in Remission sowie unter Therapie mit TNFα-Blockern höher als bei Kontrollen. Zudem sind die Effektor-Zell-Gleichgewichte bei MC zugunsten von TH17 Zellen verschoben. Somit unterstützt die Arbeit die weitverbreitete Hypothese einer gesteigerten TH17-Antwort bei MC. Auch zeigt sich eine Verminderung der TH1-Zellen im peripheren Blut bei aktiv erkrankten MC Patienten im Vergleich zu Kontrollen, was sich möglicherweise durch eine Abwanderung oder Umwandlung dieser Zellen bei aktivem MC erklären lässt.
Desweiteren zeigt sich, dass CED Patienten eine verstärkte Neigung zur vorzeitigen Immunoseneszenz aufzuweisen scheinen, was durch eine latente CMV-Infektion nochmals verstärkt erscheint. Einige CMV-assoziierte Veränderungen der T-Zell-Differenzierung, wie z.B. die CD45RA-Reexpression sowie die TNFα- und IFNγ-Mehrexpression, zeigen sich bei CMV+ CED Patienten zudem ausgeprägter als bei CMV+ Kontrollen. Interessant ist daher, dass CMV+ Probanden und CED Patienten Veränderungen aufweisen, die sich teilweise zu addieren scheinen.
Human actions are generally not determined by external stimuli, but by internal goals and by the urge to evoke desired effects in the environment. To reach these effects, humans typically have to act. But at times, deciding not to act can be better suited or even the only way to reach a desired effect. What mental processes are involved when people decide not to act to reach certain effects? From the outside it may seem that nothing remarkable is happening, because no action can be observed. However, I present three studies which disclose the cognitive processes that control nonactions.
The present experiments address situations where people intentionally decide to omit certain actions in order to produce a predictable effect in the environment. These experiments are based on the ideomotor hypothesis, which suggests that bidirectional associations can be formed between actions and the resulting effects. Because of these associations, anticipating the effects can in turn activate the respective action. The results of the present experiments show that associations can be formed between nonactions (i.e., the intentional decision not to act) and the resulting effects. Due to these associations, perceiving the nonaction effects encourages not acting (Exp. 1–3). What is more, planning a nonaction seems to come with an activation of the effects that inevitably follow the nonaction (Exp. 4–5). These results suggest that the ideomotor hypothesis can be expanded to nonactions and that nonactions are cognitively represented in terms of their sensory effects. Furthermore, nonaction effects can elicit a sense of agency (Exp. 6–8). That is, even though people refrain from acting, the resulting nonaction effects are perceived as self-produced effects.
In a nutshell, these findings demonstrate that intentional nonactions include specific mechanisms and processes, which are involved, for instance, in effect anticipation and the sense of agency. This means that, while it may seem that nothing remarkable is happening when people decide not to act, complex processes run on the inside, which are also involved in intentional actions.
Die Liste der interessanten nachzuweisenden Analyte ist lang. Deswegen besteht ein großer Bedarf zur Entwicklung neuer fluoreszierender und kolorimetrischer Chemosensoren. Ziel der vorliegenden Arbeit war daher die Synthese und Charakterisierung neuer optischer bzw. fluoreszierender und kolorimetrischer Chemosensoren mit dem Fokus auf die beiden Substanzklassen der Naphthalinbisimide und Perylenbisimide.
Der erste Arbeitsschwerpunkt befasste sich mit wasserlöslichen Naphthalinbisimiden und ist in drei Unterkapitel aufgeteilt (Kapitel III – 1.1.-1.3., Abbildung 79). Im ersten Unterkapitel (Kapitel III – 1.1.) wurden die Synthesen und optischen Eigenschaften der am Kern Amino-substituierten NBIs 60a-h, mit Dicarbonsäureresten in Imid-Position und 61a-h, mit 2-Dimethylaminoethyl-Gruppen, in polaren Lösungsmitteln beschrieben. Die systematische Anbringung verschiedener Amino-Substituenten mit steigendem elektronenziehendem Charakter der Aminoreste diente der mechanistischen Aufklärung der optischen Eigenschaften. Eine vollständige Untersuchung der optischen Eigenschaften erfolgte in wässriger Pufferlösung bei pH 2.1 sowie in Methanol und Acetonitril. Der Einfluss der Imid-Substituenten auf die optischen Eigenschaften war wie zu erwarten gering. Die verschiedenen Kern-Substituenten verursachten hingegen eine hypsochrome Verschiebung der Absorptions- und Fluoreszenzmaxima mit steigendem elektronenziehendem Charakter der an der Aminogruppe angebrachten Reste. Ein unerwarteter Trend konnte im Fall der Fluoreszenzquantenausbeute beobachtet werden. In den protischen Lösungsmitteln Wasser und Methanol wurde eine lineare Abhängigkeit gegenüber der Hammett-σmeta-Konstante ermittelt. Mit steigendem elektronenziehendem Charakter der Kern-Amino-Substituenten erfuhr die Quantenausbeute einen Anstieg auf bis zu 39% in Wasser für NBI 60h, 61h und 45% in Methanol für 60h. Die Tatsache, dass in Acetonitril keine solche Abhängigkeit gegenüber der Hammett-Konstante beobachtet werden konnte legte eine intermolekulare Wasserstoffbrücken-Bindung im angeregten Zustand als konkurrierenden Prozess zur Fluoreszenz nahe. Dieser Prozess tritt zwischen den Lösungsmittel-Molekülen und der Akzeptorgruppe (Carbonyl-Sauerstoff) der NBIs, welcher einen strahlungslosen Relaxationsprozess bzw. Fluoreszenzlöschung zur Folge hat, auf. Der Einfluss dieses Prozesses lässt sich durch die Stärke des elektronenziehenden Amino-Substituentens steuern. Die NBIs 60a-h zeigten zudem in potentiometrischen Titrationen in Wasser eine pH-Unabhängigkeit der optischen Eigenschaften bezüglich des Imid-Substituentens. Dies macht die NBIs mit Dicarbonsäureresten für die Anwendung in biologischen Systemen im neutralen pH-Milieu oder als chemische Sensoren besonders geeignet.
Aufgrund dieser interessanten Befunde wurde im zweiten Unterkapitel (Kapitel III – 1.2.) das dihalogenierte NBI 58 hinsichtlich der Sensoreigenschaften gegenüber primären, sekundären und tertiären Amin- bzw. Diamindampf sowie zur Frischekontrolle von Fleisch untersucht. Die Absorptions- und Fluoreszenz-spektroskopische Untersuchung des Dünnschichtfilms von NBI 58 zeigte die erfolgreiche, selektive Detektion von primären Aminen und Diaminen bzw. biogenen Aminen. Zum einen konnte mit bloßen Auge ein Farbumschlag von gelb nach rot und zum anderen Änderungen in den Absorptionsspektren wie die Entstehung einer neuen bathochrom verschobenen Bande im Dünnschichtfilm beobachtet werden. Die Erhöhung der Fluoreszenz wie auch die NMR-spektroskopische Untersuchung konnte hingegen ausschließlich in Lösung detektiert werden. Hiermit konnte die kovalente Wechselwirkung der Amin-Moleküle mit dem NBI 58 nachgewiesen werden. Trotz der erfolgreichen Detektion biogener Amindämpfe erwies sich NBI 58 aufgrund der zu geringen Reaktivität als ungeeigneter chemischer Sensor zur Frischekontrolle von Fleisch.
Das dritte und letzte Unterkapitel (Kapitel III – 1.3.) dieses Abschnittes bestand in der Synthese monochlor-monoamino-substituierter NBIs am Kern (65a,b und 66) und der Wechselwirkungen dieser Farbstoffe mit DNS/RNS. Die NBIs 65a,b und 66 wiesen in der Imidstellung 3-Trimethylammoniumpropyl auf, um die Wasserlöslichkeit zu gewährleisten und die elektrostatische Wechselwirkung mit dem negativ geladenen Phosphatrückgrad der DNS/RNS zu bewirken. Am Kern wurden die Aminosäuren (S)-2,3-Diaminopropionsäure (L-Dap) (65a) und (S)-2,6-Diaminohexansäure (L-Lys) (65b) sowie 2-Trimethylammoniumethylamin (66) eingefügt. Die Untersuchungen mit Hilfe von thermischen Denaturierungsstudien zeigten mit allen NBIs eine deutliche Schmelzpunkterhöhung der DNS/RNS (ΔTm-Werte zwischen 17 und 35 °C), was die Bildung von NBI/Polynukleotid-Komplexen nahelegte. Diese Komplex-Bildung konnte erneut aufgrund enormer Fluoreszenzlöschung in fluorimetrischen Titrationsstudien bestätigt werden. Hier wurden Bindungskonstanten zwischen logK = 5.9 und 7.2 M-1 ermittelt, wobei NBI 65a und poly(dG-dC)2 der stärksten Bindungsaffinität und NBI 65a und poly(dA-dT)2 der schwächste zugeordnet werden konnte. Für NBI 66 wurde die zweithöchste Bindungsaffinität zu Polynukleotid ct-DNS (logK = 7.08 M-1) beobachtet, während dieser Farbstoff sowie 65a,b nur geringe Bindungskonstanten mit dem Polynukleotid polyA-polyU zeigten. Mit Hilfe der CD-spektroskopischen Messungen wurde der Bindungsmodus und die Unterschiede in den Bindungseigenschaften der Farbstoffe mit DNS/RNS ermittelt. Der Großteil aller NBI-Verbindungen interkalierte in einer parallelen Anordnung zwischen die Basenpaare der Polynukleotide. Für NBI 65a und poly(dG-dC)2 ließ sich jedoch eine perpendikulare Anordnung zu den Basenpaaren beobachten. ITC-Titrationsstudien komplettierten letztendlich die Untersuchungen zwischen NBIs und Polynukleotiden. Neben Interkalation als Bindungsmodus konnte zusätzlich aufgrund der relativ hohen Entropiewerte eine Wechselwirkung zwischen den Substituenten am Kern und den Phosphatgruppen in der kleinen Furche festgestellt werden. Zusammengefasst sind die sterischen Hinderungen der Amino-Substituenten und die Furcheneigenschaften von ds-DNS/RNS entscheidend.
Der zweite Arbeitsschwerpunkt ist ebenfalls in drei Unterkapitel (Kapitel III – 2.1.-2.3.) aufgeteilt und befasste sich mit der Synthese und den Sensoreigenschaften kernfunktionalisierter Perylenbisimide (Abbildung 80). Im ersten Abschnitt (Kapitel III – 2.1) wurde die Synthese und die optischen Eigenschaften in Lösung der am Kern einfach und zweifach Kronenether-funktionalisierten PBIs 77a,b und 71a,b untersucht. In Imidstellung waren alle PBIs mit 2-Trimethylammoniumethyl-Resten funktionalisiert, um eine Löslichkeit in polaren Lösungsmitteln zu gewährleisten. Die Buchtpositionen wurden jeweils ein- bzw. zweifach mit den Kronenether-Einheiten 2-Hydroxymethyl-15-Krone-5 und 2-Hydroxymethyl-18-Krone-6 substituiert. Die anschließende Untersuchung der optischen Eigenschaften der PBIs zeigten bei einer Konzentration von 10-5 M in Acetonitril den monomeren Zustand und in Wasser die Ausbildung von H-Aggregaten. Die Fluoreszenzquantenausbeuten erfuhren in Acetonitril mit steigender Kronenether-Ringgröße eine Zunahme von 73% auf 81% für die PBIs 71a,b und eine vernachlässigbare geringe Zunahme von 49% auf 51% für die PBIs 77a,b. Die Abnahme der Quantenausbeute vom zweifach funktionalisierten zum einfach funktionalisierten PBI um ca. 30% ließ sich durch die stärker ausgeprägten strahlungslosen Relaxationsprozesse dieses flexibleren Moleküls im angeregten Zustand erklären.
Im zweiten Unterkapitel (Kapitel III – 2.2.) wurden die Selbstassemblierungseigenschaften der synthetisierten PBIs 71a,b und 77a,b in Gegenwart verschiedener Metallionen (Na+, K+, Rb+, Mg2+, Ca2+ und Ba2+) untersucht. Hier konnte eine Abhängigkeit von der Größe des Kronenether-Rezeptors sowie von der Art der Metallionen gezeigt werden. Die Absorptions- und Fluoreszenz-spektroskopischen Studien der zweifach funktionalisierten PBIs 71a und 71b bei einer PBI-Konzentration von c = 10-5 M zeigten ausschließlich für das 15-Krone-5-Derivat 71a und Ba2+ eine erfolgreiche Ausbildung von PBI-Stapeln mit H-artiger exzitonischer Kopplung. Aufgrund dessen erfuhr das Absorptionsmaximum eine stetige Abnahme einhergehend mit einer hypsochromen Verschiebung und die Fluoreszenz eine vollständige Löschung. Zudem konnte eine 1:1-Stöchiometrie der PBI-Stapeln ermittelt werden. Die Anpassung der spektroskopischen Änderungen an die Hill-Gleichung bestätigte letztendlich die Bildung eines [2+2]-Sandwich- bzw. Dimer-Komplexes in einem positiv kooperativen Bindungsprozess, in dem mittels ITC eine enorme Stabilisierung der Ba2+-Komplexierung aufgrund der π-π-Wechselwirkung zwischen zwei PBI-Molekülen, beobachtet wurde. Die Durchführung der Titrationsexperimente bei einer höheren PBI-Konzentration (c = 10-4 M) zusammen mit DOSY-Experimenten versicherten auch in diesem Fall die Formation diskreter Dimerkomplexe. Das einfach funktionalisierte PBI 77a zeigte in der Anwesenheit von Ba2+ ähnliche optische Änderungen. Die nachfolgenden Untersuchungen bzw. Interpretationen bestätigten die Bildung eines [1+2]-Dimerkomplexes mit H-artiger exzitonischer Kopplung, welches aufgrund der flexibleren Komplexstruktur keine Stabilisierung der Ba2+-Komplexierung erfuhr.
Neben der Metallionen-Komplexierung war PBI 71b auch in der Lage, in einer 1:2-Stöchiometrie aromatische Aminosäuren und Dipeptide zu erkennen (Kapitel III – 2.3.), da hier sowohl die Ammoniumgruppen der Aminosäuren und Dipeptide mit den Kronenethereinheiten als auch die aromatischen Einheiten mit dem PBI-Kern wechselwirken können. Fluoreszenz-Titrationsexperimente zeigten, dass die Aminosäuren L-Tryptophan und L-Tyrosin, welche elektronenreiche aromatische Gruppen aufweisen, und Dipeptide, die diese Aminosäuren enthalten, die Fluoreszenz des PBIs stark löschen. Die Bindungskonstanten der Wirt-Gast-Komplexierung in Acetonitril konnten aufgrund eines statischen Löschungsprozesses aus den Fluoreszenztitrationsdaten bestimmt werden. Hier wurde beobachtet, dass die Bindungsstärke von der Größe und der elektronischen Natur der aromatischen Einheiten sowie von dem Abstand zwischen der Ammoniumgruppe und der aromatischen Einheit in Aminosäuren und Dipeptiden abhängt. Die stärkste Bindung konnte zwischen Ala-Trp und PBI 71b mit einem Wert von 3.1 x 105 M-1 beobachtet werden. NMR-Studien bestätigten ebenfalls die Wirt-Gast-Komplexierung, ließen jedoch offen, ob es zu der Bildung von zwei Diastereomeren aufgrund der eingeschränkten Umwandlung der Atrop-Enantiomere (P und M) des PBI 71b kommt oder zu der Bildung von vier Diastereomeren infolge des Chiralitätszentrums im Kronenether.
Zusammenfassend wurden in dieser Arbeit Naphthalinbisimde und Perylenbisimide hinsichtlich ihrer Eignung als optische Chemosensoren untersucht. Die NBI-Derivate agierten aufgrund ihrer interessanten optischen Eigenschaften als chemische Sensoren selektiv für primären Amindampf und für die DNS/RNS-Wechselwirkung. Im Fall der PBI-Verbindungen wurden hervorragende fluorometrische Chemosensoren ermittelt, die Ba2+-Ionen und elektronenreiche aromatische Aminosäuren und Dipeptide in einer deutlichen Fluoreszenzlöschung detektieren können.
The Myb-MuvB (MMB) multiprotein complex is a master regulator of cell cycle-dependent gene expression. Target genes of MMB are expressed at elevated levels in several different cancer types and are included in the chromosomal instability (CIN) signature of lung, brain, and breast tumors.
This doctoral thesis showed that the complete loss of the MMB core subunit LIN9 leads to strong proliferation defects and nuclear abnormalities in primary lung adenocarcinoma cells. Transcriptome profiling and genome-wide DNA-binding analyses of MMB in lung adenocarcinoma cells revealed that MMB drives the expression of genes linked to cell cycle progression, mitosis, and chromosome segregation by direct binding to promoters of these genes. Unexpectedly, a previously unknown overlap between MMB-dependent genes and several signatures of YAP-regulated genes was identified. YAP is a transcriptional co-activator acting downstream of the Hippo signaling pathway, which is deregulated in many tumor types. Here, MMB and YAP were found to physically interact and co-regulate a set of mitotic and cytokinetic target genes, which are important in cancer. Furthermore, the activation of mitotic genes and the induction of entry into mitosis by YAP were strongly dependent on MMB. By ChIP-seq and 4C-seq, the genome-wide binding of MMB upon YAP overexpression was analyzed and long-range chromatin interaction sites of selected MMB target gene promoters were identified. Strikingly, YAP strongly promoted chromatin-association of B-MYB through binding to distal enhancer elements that interact with MMB-regulated promoters through chromatin looping.
Together, the findings of this thesis provide a so far unknown molecular mechanism by which YAP and MMB cooperate to regulate mitotic gene expression and suggest a link between two cancer-relevant signaling pathways.
The present dissertation investigates the management of RFID implementations in retail trade. Our work contributes to this by investigating important aspects that have so far received little attention in scientific literature. We therefore perform three studies about three important aspects of managing RFID implementations. We evaluate in our first study customer acceptance of pervasive retail systems using privacy calculus theory. The results of our study reveal the most important aspects a retailer has to consider when implementing pervasive retail systems. In our second study we analyze RFID-enabled robotic inventory taking with the help of a simulation model. The results show that retailers should implement robotic inventory taking if the accuracy rates of the robots are as high as the robots’ manufacturers claim. In our third and last study we evaluate the potentials of RFID data for supporting managerial decision making. We propose three novel methods in order to extract useful information from RFID data and propose a generic information extraction process. Our work is geared towards practitioners who want to improve their RFID-enabled processes and towards scientists conducting RFID-based research.
Hintergrund
In einer retrospektiven Studie in der Augenklinik Würzburg wurde die Ranibizumabtherapie bei Patienten mit altersabhängiger Makuladegeneration (AMD) im klinischen Alltag ausgewertet.
Methoden
Patientenakten von Patienten mit AMD, die im Jahr 2007 mit der Ranibizumabtherapie begannen, wurden untersucht. Daten wurden bis zum Ende der Behandlung und/oder Nachbeobachtung bis 2009 gesammelt. Der primäre Endpunkt war das Verhältnis der Patienten, die weniger als 15 Buchstaben (bzw. 0,3 logMAR Einheiten) an Visus verloren zwischen Beginn und nach 12 Monaten.
Ergebnisse
375 Patienten wurden einbezogen, nur 298 Patienten beendeten die Untersuchung nach einem Jahr. Nach 12 Monaten verloren 72% der Patienten weniger als 15 Buchstaben. Die Sehschärfe verbesserte sich bis 12 Wochen nach der ersten Injektion und verschlechterte sich danach wieder. Patienten mit mehr als 3 Injektionen profitierten mehr als Patienten mit weniger Injektionen. Durchschnittlich wurden 4,25 Injektionen innerhalb eines Jahres gegeben. Der durchschnittliche Rückgang der Netzhautdicke betrug 50 µm.
Schlussfolgerung
Intravitreale Injektionen von Ranibizumab in der Augenklinik Würzburg führten zu einer Visusverbesserung. Der Visusgewinn konnte nach 3 Monaten nicht gehalten werden. Bessere Reinjektionskriterien, mehr OCT Untersuchungen und besseres Nachsorgemanagement sollten entwickelt werden.
Herzschrittmachersysteme sind eine weitverbreitete Möglichkeit Herz-Kreislauf-Erkrankungen zu behandeln. Wegen der natürlichen Reaktion des Immunsystems auf Fremdkörper, erfolgt aber eine fortschreitende Verkapselung der Herzschrittmacherelektrode. Die Folge ist eine ansteigende Verminderung der Stimulationseffizienz durch Erhöhung der Anregungsschwelle. Die Integration der Elektrode in das Gewebe ist dabei mangelhaft und wird bestimmt durch Implantateigenschaften wie Größe, Flexibilität und Dimensionalität. Um die Integration zu verbessern, stellen dreidimensionale (3D) bzw. gewebeartige Elektroden eine Alternative zu den derzeit verwendeten planaren Metallelektroden dar. Zur Entwicklung einer leitfähigen, 3D und faserförmigen Elektrode wurden in dieser Arbeit Kohlenstoff-Nanofaser-Scaffolds über Elektrospinnen hergestellt. Durch die Modifikation des Fasergerüstes mit Natriumchlorid (NaCl) während der Scaffoldherstellung, konnte das Fasernetzwerk aufgelockert und Poren generiert werden. Die Kohlenstofffaser-Elektroden zeigten einen effizienten Energieübertrag, welcher vergleichbar mit heutigen Titannitrid (TiN) -Elektroden ist. Die Auflockerung des Fasergewebes hatte eine verbesserte Flexibilität des Faserscaffolds zu Folge. Neben der Flexibilität, konnte auch die Infiltration von Zellen in das poröse Faserscaffold erheblich verbessert werden. Dabei konnten Fibroblasten durch das gesamte Scaffold migrieren. Die Kompatibilität mit kardialen Zellen, die Grundvoraussetzung von Herzschrittmacherelektroden, wurde in vitro nachgewiesen. Durch die Kombination aus dem 3D-Elektrodengerüst mit einer Co-Kultur aus humanen Kardiomyozyten, mesenchymalen Stammzellen und Fibroblasten, erfolgte eine Einbettung der Elektrode in funktionelles kardiales Gewebe. Dadurch konnte ein lebender Gewebe-Elektroden-Hybrid generiert werden, welcher möglicherweise die Elektrode vor Immunzellen in vivo abschirmen kann. Eine Zusammenführung der hybriden Elektrode mit einen Tissue-Engineerten humanen kardialen Patch in vitro, führte zu Bildung einer nahtlosen Elektronik-Gewebe-Schnittstelle. Die fusionierte Einheit wurde abschließend auf ihre mechanische Belastbarkeit getestet und konnte über einen Elektroden-Anschluss elektrisch stimuliert werden.
Human health is known to be affected by the physical environment. Various environmental influences have been identified to benefit or challenge people's physical condition. Their heterogeneous distribution in space results in unequal burdens depending on the place of living. In addition, since societal groups tend to also show patterns of segregation, this leads to unequal exposures depending on social status. In this context, environmental justice research examines how certain social groups are more affected by such exposures. Yet, analyses of this per se spatial phenomenon are oftentimes criticized for using “essentially aspatial” data or methods which neglect local spatial patterns by aggregating environmental conditions over large areas. Recent technological and methodological developments in satellite remote sensing have proven to provide highly detailed information on environmental conditions. This narrative review therefore discusses known influences of the urban environment on human health and presents spatial data and applications for analyzing these influences. Furthermore, it is discussed how geographic data are used in general and in the interdisciplinary research field of environmental justice in particular. These considerations include the modifiable areal unit problem and ecological fallacy. In this review we argue that modern earth observation data can represent an important data source for research on environmental justice and health. Especially due to their high level of spatial detail and the provided large-area coverage, they allow for spatially continuous description of environmental characteristics. As a future perspective, ongoing earth observation missions, as well as processing architectures, ensure data availability and applicability of ’big earth data’ for future environmental justice analyses.
Converging evidence suggests a role of serotonin (5-hydroxytryptamine, 5-HT) and tryptophan hydroxylase 2 (TPH2), the rate-limiting enzyme of 5-HT synthesis in the brain, in modulating long-term, neurobiological effects of early-life adversity. Here, we aimed at further elucidating the molecular mechanisms underlying this interaction, and its consequences for socio-emotional behaviors, with a focus on anxiety and social interaction. In this study, adult, male Tph2 null mutant (Tph2\(^{-/-}\)) and heterozygous (Tph2\(^{+/-}\)) mice, and their wildtype littermates (Tph2\(^{+/+}\)) were exposed to neonatal, maternal separation (MS) and screened for behavioral changes, followed by genome-wide RNA expression and DNA methylation profiling. In Tph2\(^{-/-}\) mice, brain 5-HT deficiency profoundly affected socio-emotional behaviors, i.e., decreased avoidance of the aversive open arms in the elevated plus-maze (EPM) as well as decreased prosocial and increased rule breaking behavior in the resident-intruder test when compared to their wildtype littermates. Tph2\(^{+/-}\) mice showed an ambiguous profile with context-dependent, behavioral responses. In the EPM they showed similar avoidance of the open arm but decreased prosocial and increased rule breaking behavior in the resident-intruder test when compared to their wildtype littermates. Notably, MS effects on behavior were subtle and depended on the Tph2 genotype, in particular increasing the observed avoidance of EPM open arms in wildtype and Tph2\(^{+/-}\) mice when compared to their Tph2\(^{-/-}\) littermates. On the genomic level, the interaction of Tph2 genotype with MS differentially affected the expression of numerous genes, of which a subset showed an overlap with DNA methylation profiles at corresponding loci. Remarkably, changes in methylation nearby and expression of the gene encoding cholecystokinin, which were inversely correlated to each other, were associated with variations in anxiety-related phenotypes. In conclusion, next to various behavioral alterations, we identified gene expression and DNA methylation profiles to be associated with TPH2 inactivation and its interaction with MS, suggesting a gene-by-environment interaction-dependent, modulatory function of brain 5-HT availability.
In einer Studie wurde der Zusammenhang pathologischer Werte von C-Reaktivem Protein (295 Fälle)- - sowie Leukozyten-Anzahlen (292 Fälle) einerseits und dosiskorrigierter Serumkonzentration der Antipsychotika Haloperidol, Risperidon, Olanzapin, Quetiapin und Aripiprazol andererseits mittels therapeutischem Drug Monitoring bestimmter Serumkonzentrationen sowie pathologische CRP (295 Fälle)- und Leukozyten (292 Fälle)-Werte ausgewertet.
Zielsetzung der vorliegenden Arbeit war es, den Einfluss von Entzündung, gemessen durch CRP-Wert und Leukozyten, auf die dosiskorrigierten Antipsychotika-Serumkonzentrationen zu untersuchen.
In der Quetiapin-Stichprobe konnte ein signifikanter Zusammenhang von pathologischen CRP-Werten und der dosiskorrigierten Serumkonzentration berechnet werden. In der Olanzapin-Stichprobe ergab sich ein trendmäßiger Zusammenhang von pathologischen CRP-Werten und der dosiskorrigierten Serumkonzentration. Dosiskorrigierte Serumkonzentrationen über der therapeutischen Obergrenze waren in der Quetiapin-Stichprobe mit pathologischen CRP-Werten assoziiert.
In keiner Stichprobe konnte ein signifikanter Zusammenhang von Leukozyten-Anzahl und dosiskorrigierter Serumkonzentration aufgezeigt werden.
Wir konnten damit erstmals einen signifikanten Zusammenhang von Entzündung und Serumkonzentration für Quetiapin (und partiell auch Olanzapin) zeigen. Klinische Konsequenz sollte - vor allem bei älteren Patienten - eine Quetiapin (und auch Olanzapin-)-Dosisanpassung unter inflammatorischen Bedingungen sein, um das Risiko verstärkter bzw. sogar toxischer Nebenwirkungen durch einen Anstieg der Serumkonzentration zu minimieren.
Weitere Studien mit einer größeren Fallzahl für die anderen hier untersuchten und nicht signifikant assoziiert gefundenen Antipsychotika sind erforderlich, um das Risiko erhöhter Serumkonzentrationen unter inflammatorischen Bedingungen für diese ausschließen zu können. Darüber hinaus sind weitere Untersuchungen mit Berücksichtigung anderer auf CYP-Ebene interagierender Faktoren wie Komedikation, körperlichen Begleiterkrankungen, Raucherstatus oder Polymorphismen sinnvoll, um Risikogruppen noch genauer definieren zu können.
Die vorliegende Arbeit umfasst die Synthese und Charakterisierung 23 neuartiger, multifunktionaler Kompositmaterialien basierend auf lanthanidhaltigen Verbindungen sowie verschiedenen Nano- und Mikropartikeln.
Die dargestellten Materialien konnten als Core/Shell-Systeme mit einem nano- bzw. mikropartikelhaltigen Kern und einer lanthanidhaltigen Hülle charakterisiert werden und vereinen aufgrund ihres Kompositcharakters die spezifischen Eigenschaften der Einzelkomponenten wie Lumineszenz, Superparamagnetismus oder Reflexionseigen-schaften miteinander.
Zur Synthese multifunktionaler, lumineszierender Materialien wurden zirconylbasierte, lumineszierende Nanopartikel mit Lanthanidchloriden und lanthanidhaltigen MOFs funktionalisiert. Die Kompositsysteme LnCl3@ZrO(FMN) (FMN = Flavinmononukleotid, Ln = Y, Sc, La, Eu, Tb, Ho) ermöglichen eine Modifizierung der Lumineszenzeigenschaf-ten der Materialien abhängig von der Reaktionstemperatur sowie dem verwendeten Selten-Erd-Ion. Durch Variation der Nanopartikelkomponente konnte mittels der Kom-posite LnCl3@ZrO(MFP) (MFP = Methylfluoresceinphosphat) ein zusätzlicher sol-vatochromer Effekt der Systeme eingeführt werden, während das Kompositmaterial YCl3@ZrO(RP) (RP = Resorufinphosphat) eine andere Chromatizität zugänglich macht.
Durch Modifizierung von ZrO(FMN)- und ZrO(MFP)-Nanopartikeln mit 3∞[Eu2(BDC)3]·
2DMF·2H2O (BDC2- = Benzol-1,4-dicarboxylat) wurden Kompositmaterialien dargestellt, die zwei Lumineszenzprozesse mit unterschiedlicher Chromatizität und unterschiedli-cher Anregbarkeit miteinander kombinieren und somit eine reversible Schaltbarkeit zwischen beiden Prozessen durch Variation der Anregungswellenlänge ermöglichen.
Zur Synthese luminomagnetischer Materialien wurden superparamagnetische Fe3O4/SiO2-Mikropartikel mit einer Vielzahl lanthanidhaltiger MOFs, die sich hinsichtlich ihrer Lumineszenzeigenschaften und ihrer Stabilität gegenüber Luft und Wasser unterscheiden, modifiziert. Als MOFs wurden hierbei 2∞[Ln2Cl6(Bipy)3]·2Bipy (Bipy = 4,4‘-Bipyridin, Ln = Nd, Sm, Eu, Tb, Er), 3∞[Eu(Im)2], 3∞[Ba0.95Eu0.05(Im)2] (Im = Imidazolat) und 3∞[Eu2(BDC)3]·2DMF·2H2O eingesetzt. Die Variation der zur Funktionalisierung verwendeten Komponente oder eine Kombination mehrerer MOFs ermöglicht eine Anpassung der Lumineszenz der Kompositmaterialien innerhalb des kompletten sichtbaren Spektralbereichs sowie im NIR-Bereich.
Die dargestellten luminomagnetische Kompositmaterialien mit wasserempfindlichen MOFs können zur Detektion von Wasser in verschiedenen organischen Lösungsmitteln verwendet werden und stellen somit eine mobile und einfach anwendbare Alternative zur Karl-Fischer-Titration mit einer vergleichbaren Sensitivität dar. So eignen sich die Kompositsysteme 2∞[Eu2Cl6(Bipy)3]·2Bipy@Fe3O4/SiO2 und 2∞[Eu2Cl6(Bipy)3]·2Bipy,
2∞[Tb2Cl6(Bipy)3]·2Bipy@Fe3O4/SiO2 als optische turn-off-Sensoren, während das Kom-posit 3∞[Eu2(BDC)3]·2DMF·2H2O,2∞[Tb2Cl6(Bipy)3]·2Bipy@Fe3O4/SiO2 als ratiometrischer Sensor verwendet werden kann.
Als Alternative zu sphärischen Partikeln wurden auch anisotrope, stäbchenförmige Fe3O4/SiO2-Mikropartikel mittels 3∞[Eu2(BDC)3]·2DMF·2H2O modifiziert. Das resul-tierende Kompositmaterial vereint die isotropen Lumineszenzeigenschaften der MOF-Hülle mit der anisotropen Reflexion von sichtbarem Licht der. Durch die Wahl der Anregungswellenlänge und Richtung eines externen Magnetfelds wird eine stufenlose und reversible Schaltbarkeit zwischen isotropen und anisotropen Eigenschaften ermöglicht.
Durch mechanochemische Umsetzung der MOF-Edukte [LnCl3(Py)4]·0.5Py (Ln = Eu, Ho) und 4,4‘-Bipyridin konnte eine Vielzahl von literaturbekannten lanthanidhaltigen Komplexen und Koordinationspolymeren mittels einer neuen und zeiteffizienten Syntheseroute dargestellt werden. Hierbei kann die Verknüpfungsdimension der resultierenden Produkte abhängig von verschiedenen Reaktionsparametern, die den Energieeintrags der Kugelmühle beeinflussen, gesteuert werden.
Purpose: The effective point of measurement (EPOM) of cylindrical ionization chambers differs from their geometric center. The exact shift depends on chamber construction details, above all the chamber size, and to some degree on the field-size and beam quality. It generally decreases as the chamber dimensions get smaller. In this work, effective points of measurement in small photon fields of a range of cylindrical chambers of different sizes are investigated, including small chambers that have not been studied previously.
Methods: In this investigation, effective points of measurement for different ionization chambers (Farmer type, scanning chambers, micro-ionization chambers) and solid state detectors were determined by measuring depth-ionization curves in a 6 MV beam in field sizes between 2 9 2 cm2 and 10 9 10 cm2 and comparing those curves with curves measured with plane-parallel chambers.
Results: It was possible to average the results to one shift per detector, as the results were sufficiently independent of the studied field sizes. For cylindrical ion chambers, shifts of the EPOM were determined to be between 0.49 and 0.30 times the inner chamber radius from the reference point.
Conclusions: We experimentally confirmed the previously reported decrease of the EPOM shift with decreasing detector size. Highly accurate data for a large range of detectors, including new very small ones, were determined. Thus, small chambers noticeably differ from the 0.5-times to 0.6-times the inner chamber radius recommendations in current dosimetry protocols. The detector-individual EPOMs need to be considered for measurements of depth-dose curves.
Für die Dosimetrie in der Strahlentherapie sind eine Reihe von Detektoren unterschiedlicher Bauform und Funktionsweise erhältlich. Detektoreigenschaften wie die Größe des aktiven Volumens,
energieabhängiges Ansprechen und Feldstörungen durch Bauteile beeinflussen ihr Signal, so dass kein idealer, universell einsetzbarer Detektor existiert. Insbesondere unter Messbedingungen, bei denen sich die Teilchenfluenz am Ort der Messung stark ändert, können die Detektorsignale stark von den wahren Dosisverhältnissen abweichen, z.B. in kleinen Feldern. Im Rahmen dieser Arbeit wurde das Ansprechen verschiedener Detektortypen in solchen Extremsituationen analysiert. Dioden und Ionisationskammern verschiedener Bauformen und Größen wurden in verschiedenen Experimenten gegen Gafchromic-EBT3-Film verglichen.
Das Ansprechen auf Streustrahlung konnte durch Ausblockung der Feldmitte untersucht werden,
wobei zusätzlich geometrisch der Volumeneffekt korrigiert wurde. Dabei zeigte sich teils ein starkes Überansprechen. Ferner wurde gezeigt, dass die bei der Messung von Querprofilen, also sowohl in der Feldmitte, in Bereichen starker Dosisgradienten und außerhalb des Nutzfeldes, auftretenden Abweichungen durch die Verwendung einer Detektorkombination kompensiert werden können. Somit verbessert sich auch die Übereinstimmung mit den auf Film gemessenen Profilen.
Für Ionisationskammern wurden effektive Messpunkte bestimmt, wobei die notwendigen Verschiebungen teils deutlich geringer waren als in den gängigen Dosimetrieprotokollen empfohlen. Insbesondere für kleinvolumige Ionisationskammern mit geringen Signalstärken kam es bei der Verwendung von im Bestrahlungsraum positionierten Elektrometern zu Störeinflüssen durch Streustrahlung. Diese Effekte konnten durch Reduzierung der das Elektrometer erreichenden Streustrahlung verringert werden.
Anschließend ließ sich das Ansprechen im Aufbaubereich vergleichen. Hier zeigten sich insbesondere Unterschiede zwischen den Detektortypen, aber auch zwischen den verwendeten Polaritäten der Kammerspannung. Durch die Verwendung einer Bleifolie wurde der Einfluss von
Elektronenkontamination herausgefiltert. Zusätzlich wurden das Ansprechen verschiedener Detektoren im oberflächennahen Bereich auch bei angelegten magnetischen Feldern von Feldstärken
bis zu 1,1 T untersucht.
In allen Fällen wurden Detektorgebrauchsgrenzen aufgezeigt. Die Erkenntnisse ermöglichen es, in den verschiedenen Extremsituationen geeignete Detektoren zu wählen, und eine Abschätzung der residualen Abweichungen durchzuführen. Gezeigt wurde auch, wo eine Detektorkombination die Genauigkeit verbessern kann.
In dieser Dissertation wurden Unterschiede hinsichtlich der Fähigkeit zur Erfassung depressiver Symp¬to¬matik der drei Screeninginstrumente PHQ-2, ESAS-Dpr und DT im palliativ-onkologischen Kontext für den deutschsprachigen Raum untersucht. Ziel war es eine Empfehlung abzugeben, ob für das Screening nach depressiver Symptomatik, die Empfehlungen der kanadischen Guideline von Cancer Care Ontario oder die Empfehlungen der S3-Leitlinie Palliativmedizin anzuwenden sind. Weiterhin sollte die Frage geklärt werden, ob im deutschsprachigen Raum die Instrumente ESAS-Dpr und DT als äquivalente Instrumente verwendet werden können.
Die Ergebnisse der Hauptfragestellung dieser Dissertation demonstrieren die schwache Übereinstimmung von ESAS-Dpr mit den anderen Ultra-Kurz-Screening-Instrumenten PHQ-2 und DT. Dabei wurde zum ersten Mal ein Vergleich zwischen ESAS-Dpr und PHQ-2 durchgeführt und eine limitierte Screening-Fähigkeit von ESAS-Dpr bei palliativ erkrankten Patienten gemessen. Des Weiteren konnte in dieser Arbeit gezeigt werden, dass im vorliegenden Patientenkollektiv das DT und ESAS-Dpr keine ausreichende Übereinstimmung besitzen um im deutschen Raum synonym verwendet werden zu können. Die zugrundeliegende deutsche Übersetzung der englischen Begrifflichkeiten 'distress' als Belastung und 'depression' als Depression wurde als ausschlaggebend für dieses Ergebnis vermutet.
In der Zusammenschau der Ergebnisse dieser Studie entstand ein Algorithmus für das Erfassen von Depressivität bei palliativ-onkologisch erkrankten Erwachsenen im alltäglichen und praktischen Gebrauch.
Mobile health interventions (i.e., “apps”) are used to address mental health and are an increasingly popular method available to both individuals and organizations to manage workplace stress. However, at present, there is a lack of research on the effectiveness of mobile health interventions in counteracting or improving stress-related health problems, particularly in naturalistic, non-clinical settings. This project aimed at validating a mobile health intervention (which is theoretically grounded in the Job Demands-Resources Model) in preventing and managing stress at work. Within the mobile health intervention, employees make an evidence-based, personalized, psycho-educational journey to build further resources, and thus, reduce stress. A large-scale longitudinal randomized control trial, conducted with six European companies over 6 weeks using four measurement points, examined indicators of mental health via measures of stress, wellbeing, resilience, and sleep. The data were analyzed by means of hierarchical multilevel models for repeated measures, including both self-report measures and user behavior metrics from the app. The results (n = 532) suggest that using the mobile health intervention (vs. waitlist control group) significantly improved stress and wellbeing over time. Higher engagement in the intervention increased the beneficial effects. Additionally, use of the sleep tracking function led to an improvement in sleeping troubles. The intervention had no effects on measures of physical health or social community at work. Theoretical and practical implications of these findings are discussed, focusing on benefits and challenges of using technological solutions for organizations to support individuals’ mental health in the workplace.
This work deals with the development and application of novel quantum Monte Carlo methods to simulate fermion-boson models. Our developments are based on the path-integral formalism, where the bosonic degrees of freedom are integrated out exactly to obtain a retarded fermionic interaction. We give an overview of three methods that can be used to simulate retarded interactions. In particular, we develop a novel quantum Monte Carlo method with global directed-loop updates that solves the autocorrelation problem of previous approaches and scales linearly with system size. We demonstrate its efficiency for the Peierls transition in the Holstein model and discuss extensions to other fermion-boson models as well as spin-boson models. Furthermore, we show how with the help of generating functionals bosonic observables can be recovered directly from the Monte Carlo configurations. This includes estimators for the boson propagator, the fidelity susceptibility, and the specific heat of the Holstein model. The algorithmic developments of this work allow us to study the specific heat of the spinless Holstein model covering its entire parameter range. Its key features are explained from the single-particle spectral functions of electrons and phonons. In the adiabatic limit, the spectral properties are calculated exactly as a function of temperature using a classical Monte Carlo method and compared to results for the Su-Schrieffer-Heeger model.
Fungi of the order Mucorales colonize all kinds of wet, organic materials and represent a permanent part of the human environment. They are economically important as fermenting agents of soybean products and producers of enzymes, but also as plant parasites and spoilage organisms. Several taxa cause life-threatening infections, predominantly in patients with impaired immunity. The order Mucorales has now been assigned to the phylum Mucoromycota and is comprised of 261 species in 55 genera. Of these accepted species, 38 have been reported to cause infections in humans, as a clinical entity known as mucormycosis. Due to molecular phylogenetic studies, the taxonomy of the order has changed widely during the last years. Characteristics such as homothallism, the shape of the suspensors, or the formation of sporangiola are shown to be not taxonomically relevant. Several genera including Absidia, Backusella, Circinella, Mucor, and Rhizomucor have been amended and their revisions are summarized in this review. Medically important species that have been affected by recent changes include Lichtheimia corymbifera, Mucor circinelloides, and Rhizopus microsporus. The species concept of Rhizopus arrhizus (syn. R. oryzae) is still a matter of debate. Currently, species identification of the Mucorales is best performed by sequencing of the internal transcribed spacer (ITS) region. Ecologically, the Mucorales represent a diverse group but for the majority of taxa, the ecological role and the geographic distribution remain unknown. Understanding the biology of these opportunistic fungal pathogens is a prerequisite for the prevention of infections, and, consequently, studies on the ecology of the Mucorales are urgently needed.
Das hellenistische Hohelied
(2019)
Automation in Software Performance Engineering Based on a Declarative Specification of Concerns
(2019)
Software performance is of particular relevance to software system design, operation, and evolution because it has a significant impact on key business indicators. During the life-cycle of a software system, its implementation, configuration, and deployment are subject to multiple changes that may affect the end-to-end performance characteristics. Consequently, performance analysts continually need to provide answers to and act based on performance-relevant concerns. To ensure a desired level of performance, software performance engineering provides a plethora of methods, techniques, and tools for measuring, modeling, and evaluating performance properties of software systems. However, the answering of performance concerns is subject to a significant semantic gap between the level on which performance concerns are formulated and the technical level on which performance evaluations are actually conducted. Performance evaluation approaches come with different strengths and limitations concerning, for example, accuracy, time-to-result, or system overhead. For the involved stakeholders, it can be an elaborate process to reasonably select, parameterize and correctly apply performance evaluation approaches, and to filter and interpret the obtained results. An additional challenge is that available performance evaluation artifacts may change over time, which requires to switch between different measurement-based and model-based performance evaluation approaches during the system evolution. At model-based analysis, the effort involved in creating performance models can also outweigh their benefits.
To overcome the deficiencies and enable an automatic and holistic evaluation of performance throughout the software engineering life-cycle requires an approach that: (i) integrates multiple types of performance concerns and evaluation approaches, (ii) automates performance model creation, and (iii) automatically selects an evaluation methodology tailored to a specific scenario. This thesis presents a declarative approach —called Declarative Performance Engineering (DPE)— to automate performance evaluation based on a humanreadable specification of performance-related concerns. To this end, we separate the definition of performance concerns from their solution. The primary scientific contributions presented in this thesis are:
A declarative language to express performance-related concerns and a corresponding processing framework:
We provide a language to specify performance concerns independent of a concrete performance evaluation approach. Besides the specification of functional aspects, the language allows to include non-functional tradeoffs optionally. To answer these concerns, we provide a framework architecture and a corresponding reference implementation to process performance concerns automatically. It allows to integrate arbitrary performance evaluation approaches and is accompanied by reference implementations for model-based and measurement-based performance evaluation.
Automated creation of architectural performance models from execution traces:
The creation of performance models can be subject to significant efforts outweighing the benefits of model-based performance evaluation. We provide a model extraction framework that creates architectural performance models based on execution traces, provided by monitoring tools.The framework separates the derivation of generic information from model creation routines. To derive generic information, the framework combines state-of-the-art extraction and estimation techniques. We isolate object creation routines specified in a generic model builder interface based on concepts present in multiple performance-annotated architectural modeling formalisms. To create model extraction for a novel performance modeling formalism, developers only need to write object creation routines instead of creating model extraction software from scratch when reusing the generic framework.
Automated and extensible decision support for performance evaluation approaches:
We present a methodology and tooling for the automated selection of a performance evaluation approach tailored to the user concerns and application scenario. To this end, we propose to decouple the complexity of selecting a performance evaluation approach for a given scenario by providing solution approach capability models and a generic decision engine. The proposed capability meta-model enables to describe functional and non-functional capabilities of performance evaluation approaches and tools at different granularities. In contrast to existing tree-based decision support mechanisms, the decoupling approach allows to easily update characteristics of solution approaches as well as appending new rating criteria and thereby stay abreast of evolution in performance evaluation tooling and system technologies.
Time-to-result estimation for model-based performance prediction:
The time required to execute a model-based analysis plays an important role in different decision processes. For example, evaluation scenarios might require the prediction results to be available in a limited period of time such that the system can be adapted in time to ensure the desired quality of service. We propose a method to estimate the time-to-result for modelbased performance prediction based on model characteristics and analysis parametrization. We learn a prediction model using performancerelevant features thatwe determined using statistical tests. We implement the approach and demonstrate its practicability by applying it to analyze a simulation-based multi-step performance evaluation approach for a representative architectural performance modeling formalism.
We validate each of the contributions based on representative case studies. The evaluation of automatic performance model extraction for two case study systems shows that the resulting models can accurately predict the performance behavior. Prediction accuracy errors are below 3% for resource utilization and mostly less than 20% for service response time. The separate evaluation of the reusability shows that the presented approach lowers the implementation efforts for automated model extraction tools by up to 91%. Based on two case studies applying measurement-based and model-based performance evaluation techniques, we demonstrate the suitability of the declarative performance engineering framework to answer multiple kinds of performance concerns customized to non-functional goals. Subsequently, we discuss reduced efforts in applying performance analyses using the integrated and automated declarative approach. Also, the evaluation of the declarative framework reviews benefits and savings integrating performance evaluation approaches into the declarative performance engineering framework. We demonstrate the applicability of the decision framework for performance evaluation approaches by applying it to depict existing decision trees. Then, we show how we can quickly adapt to the evolution of performance evaluation methods which is challenging for static tree-based decision support systems. At this, we show how to cope with the evolution of functional and non-functional capabilities of performance evaluation software and explain how to integrate new approaches. Finally, we evaluate the accuracy of the time-to-result estimation for a set of machinelearning algorithms and different training datasets. The predictions exhibit a mean percentage error below 20%, which can be further improved by including performance evaluations of the considered model into the training data. The presented contributions represent a significant step towards an integrated performance engineering process that combines the strengths of model-based and measurement-based performance evaluation. The proposed performance concern language in conjunction with the processing framework significantly reduces the complexity of applying performance evaluations for all stakeholders. Thereby it enables performance awareness throughout the software engineering life-cycle. The proposed performance concern language removes the semantic gap between the level on which performance concerns are formulated and the technical level on which performance evaluations are actually conducted by the user.
Promising initial insights show that offices designed to permit physical activity (PA) may reduce workplace sitting time. Biophilic approaches are intended to introduce natural surroundings into the workplace, and preliminary data show positive effects on stress reduction and elevated productivity within the workplace. The primary aim of this pilot study was to analyze changes in workplace sitting time and self-reported habit strength concerning uninterrupted sitting and PA during work, when relocating from a traditional office setting to “active” biophilic-designed surroundings. The secondary aim was to assess possible changes in work-associated factors such as satisfaction with the office environment, work engagement, and work performance, among office staff. In a pre-post designed field study, we collected data through an online survey on health behavior at work. Twelve participants completed the survey before (one-month pre-relocation, T1) and twice after the office relocation (three months (T2) and seven months post-relocation (T3)). Standing time per day during office hours increased from T1 to T3 by about 40 min per day (p < 0.01). Other outcomes remained unaltered. The results suggest that changing office surroundings to an active-permissive biophilic design increased standing time during working hours. Future larger-scale controlled studies are warranted to investigate the influence of office design on sitting time and work-associated factors during working hours in depth.
Macrophages stand in the first line of defense against a variety of pathogens but are also involved in the maintenance of tissue homeostasis. To fulfill their functions macrophages sense a broad range of pathogen- and damage-associated molecular patterns (PAMPs/DAMPs) by plasma membrane and intracellular pattern recognition receptors (PRRs). Intriguingly, the overwhelming majority of PPRs trigger the production of the pleiotropic cytokine tumor necrosis factor-alpha (TNF). TNF affects almost any type of cell including macrophages themselves. TNF promotes the inflammatory activity of macrophages but also controls macrophage survival and death. TNF exerts its activities by stimulation of two different types of receptors, TNF receptor-1 (TNFR1) and TNFR2, which are both expressed by macrophages. The two TNF receptor types trigger distinct and common signaling pathways that can work in an interconnected manner. Based on a brief general description of major TNF receptor-associated signaling pathways, we focus in this review on research of recent years that revealed insights into the molecular mechanisms how the TNFR1-TNFR2 signaling network controls the life and death balance of macrophages. In particular, we discuss how the TNFR1-TNFR2 signaling network is integrated into PRR signaling.
An intricate network of molecular and cellular actors orchestrates the delicate balance between effector immune responses and immune tolerance. The pleiotropic cytokine tumor necrosis factor-alpha (TNF) proves as a pivotal protagonist promoting but also suppressing immune responses. These opposite actions are accomplished through specialist cell types responding to TNF via TNF receptors TNFR1 and TNFR2. Recent findings highlight the importance of TNFR2 as a key regulator of activated natural FoxP3+ regulatory T cells (Tregs) in inflammatory conditions, such as acute graft-vs.-host disease (GvHD) and the tumor microenvironment. Here we review recent advances in our understanding of TNFR2 signaling in T cells and discuss how these can reconcile seemingly conflicting observations when manipulating TNF and TNFRs. As TNFR2 emerges as a new and attractive target we furthermore pinpoint strategies and potential pitfalls for therapeutic targeting of TNFR2 for cancer treatment and immune tolerance after allogeneic hematopoietic cell transplantation.
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and its death receptors TRAILR1/death receptor 4 (DR4) and TRAILR2/DR5 trigger cell death in many cancer cells but rarely exert cytotoxic activity on non-transformed cells. Against this background, a variety of recombinant TRAIL variants and anti-TRAIL death receptor antibodies have been developed and tested in preclinical and clinical studies. Despite promising results from mice tumor models, TRAIL death receptor targeting has failed so far in clinical studies to show satisfying anti-tumor efficacy. These disappointing results can largely be explained by two issues: First, tumor cells can acquire TRAIL resistance by several mechanisms defining a need for combination therapies with appropriate sensitizing drugs. Second, there is now growing preclinical evidence that soluble TRAIL variants but also bivalent anti-TRAIL death receptor antibodies typically require oligomerization or plasma membrane anchoring to achieve maximum activity. This review discusses the need for oligomerization and plasma membrane attachment for the activity of TRAIL death receptor agonists in view of what is known about the molecular mechanisms of how TRAIL death receptors trigger intracellular cell death signaling. In particular, it will be highlighted which consequences this has for the development of next generation TRAIL death receptor agonists and their potential clinical application.
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) and its death receptors TRAILR1/death receptor 4 (DR4) and TRAILR2/DR5 trigger cell death in many cancer cells but rarely exert cytotoxic activity on non-transformed cells. Against this background, a variety of recombinant TRAIL variants and anti-TRAIL death receptor antibodies have been developed and tested in preclinical and clinical studies. Despite promising results from mice tumor models, TRAIL death receptor targeting has failed so far in clinical studies to show satisfying anti-tumor efficacy. These disappointing results can largely be explained by two issues: First, tumor cells can acquire TRAIL resistance by several mechanisms defining a need for combination therapies with appropriate sensitizing drugs. Second, there is now growing preclinical evidence that soluble TRAIL variants but also bivalent anti-TRAIL death receptor antibodies typically require oligomerization or plasma membrane anchoring to achieve maximum activity. This review discusses the need for oligomerization and plasma membrane attachment for the activity of TRAIL death receptor agonists in view of what is known about the molecular mechanisms of how TRAIL death receptors trigger intracellular cell death signaling. In particular, it will be highlighted which consequences this has for the development of next generation TRAIL death receptor agonists and their potential clinical application.
Brain serotonin (5-hydroxytryptamine, 5-HT) system dysfunction is implicated in exaggerated fear responses triggering various anxiety-, stress-, and trauma-related disorders. However, the underlying mechanisms are not well understood. Here, we investigated the impact of constitutively inactivated 5-HT synthesis on context-dependent fear learning and extinction using tryptophan hydroxylase 2 (Tph2) knockout mice. Fear conditioning and context-dependent fear memory extinction paradigms were combined with c-Fos imaging and electrophysiological recordings in the dorsal hippocampus (dHip). Tph2 mutant mice, completely devoid of 5-HT synthesis in brain, displayed accelerated fear memory formation and increased locomotor responses to foot shock. Furthermore, recall of context-dependent fear memory was increased. The behavioral responses were associated with increased c-Fos expression in the dHip and resistance to foot shock-induced impairment of hippocampal long-term potentiation (LTP). In conclusion, increased context-dependent fear memory resulting from brain 5-HT deficiency involves dysfunction of the hippocampal circuitry controlling contextual representation of fear-related behavioral responses.
Two chiral chemical molecules being mirror images of each other, also referred to as enantiomers, may have different pharmacokinetic, pharmacodynamic, and toxicological effects. Thus, pharmaceutical manufacturers and authorities are increasingly interested in the approval of enantiopure drugs. However, the isomeric purity and the limits for isomeric impurities have to be specified applying enantioselective analytical methods, such as capillary electrophoresis.
The separation of enantiomers in capillary electrophoresis may be improved by the addition of ionic liquids to the background electrolyte. The aim of this work was to investigate the influence of different separation conditions on the enantioseparation of phenethylamines in background electrolytes containing ionic liquids based on tetrabutylammonium cations.
Best chiral separations were achieved at acidic pH values using phosphate buffers containing 125 mmol/L tetrabutylammonium based salts. Different reasons explaining enhanced enantioseparations in buffers containing ionic liquids were found. First, due to an improvement of the cyclodextrin solubility, the addition of ionic liquids to the background electrolyte enables the use of higher concentrations of these chiral selector. Furthermore, the adsorption of tetrabutylammonium cations to the negatively charged capillary surface results in a reduction of the electroosmotic flow. Hence, the resulting prolongation of migration times leads to a longer period of time for the separation of temporarily formed diastereomeric analyte cyclodextrin complexes, which yields improved enantioseparation. Additionally, due to a decrease of the adsorption of positively charged phenethylamine analyte molecules to capillary surface silanol groups, the adsorption of ionic liquid cations inhibits peak broadening. A further reason explaining an enhanced enantioseparation by the addition of ionic liquids to the background electrolyte is a competition between tetrabutylammonium cations and analyte enantiomers for the inclusion into cyclodextrin cavities.
Furthermore, the influence of different chiral counterions, combined with tetrabutylammonium cations, on the enantioseparation of phenethylamines was investigated. Solely anions based on the basic proteinogenic amino acids L lysine and L arginine yielded chiral separation results superior to those achieved using achiral tetrabutylammonium chloride as background electrolyte additive. Especially the application of tetrabutylammonium L argininate gave very good enantioseparations of all investigated ephedrine derivatives, which might be explained by the ability of L arginine to affect the formation of complexes between analytes and cyclodextrins.
Besides the investigation of the influence of ionic liquids on the enantioseparation, complexes between phenethylamine enantiomers and β cyclodextrin derivatives were characterized by affinity capillary electrophoresis. The binding constants between analyte enantiomers and cyclodextrins and the electrophoretic mobilities of the temporarily formed complexes were determined and compared to the observed chiral resolution values. While neither the calculated binding constants nor their differences correlated with the quality of the enantioseparation, a strong correlation between the differences of the electrophoretic mobilities of the complexes and the chiral resolution values was found.
Supramolecular Block Copolymers by Seeded Living Supramolecular Polymerization of Perylene Bisimides
(2019)
The research on supramolecular polymerization has undergone a rapid development in the last two decades, particularly since supramolecular polymers exhibit a broad variety of functionalities and applications in organic electronics, biological science or as functional materials (Chapter 2.1). Although former studies have focused on investigation of the thermodynamics of supramolecular polymerization (Chapter 2.2), the academic interest in the recent years shifted towards gaining insight into kinetically controlled self-assembly and pathway complexity to generate novel out-of-equilibrium architectures with interesting nanostructures and features (Chapter 2.3). Along this path, the concepts of seeded and living supramolecular polymerization were recently developed to enable the formation of supramolecular polymers with controlled length and low polydispersity under precise kinetic control (Chapter 2.4). Besides that, novel strategies were developed to achieve supramolecular copolymerization resulting in complex multicomponent nanostructures with different structural motives. The classification of these supramolecular copolymers on the basis of literature examples and an overview of previously reported principles to create such supramolecular architectures are provided in Chapter 2.5.
The aim of the thesis was the non-covalent synthesis of highly desirable supramolecular block copolymers by the approach of living seeded supramolecular polymerization and to study the impact of the molecular shape of the monomeric building blocks on the supramolecular copolymerization. Based on the structure of the previously investigated PBI organogelator H-PBI a series of novel PBIs, bearing identical hydrogen-bonding amide side-groups in imide-position and various kind or number of substituents in bay-position, was synthesized and analyzed within this thesis. The new PBIs were successfully obtained in three steps starting from the respective bromo-substituted perylene-3,4:9,10-tetracarboxylic acid tetrabutylesters or from the N,N’-dicyclohexyl-1,7-dibromoperylene-3,4:9,10-tetracarboxylic acid bisimide. All target compounds were obtained in the final step by imidization reactions of the respective perylene tetracarboxylic acid bisanhydride precursors with N-(2-aminoethyl)-3,4,5-tris(dodecyloxy)-benzamide and were fully characterized by 1H and 13C NMR spectroscopy as well as high resolution mass spectrometry.
The variation of bay-substituents strongly changes the optical properties of the monomeric PBIs which were investigated by UV/vis and fluorescence spectroscopy. The increase of the number of the methoxy-substituents provokes, for example, a red-shift of the absorption maxima concomitant with a decrease of extinction coefficients and leads to a drastic increase of the fluorescence quantum yields. Furthermore, the molecular geometry of the PBIs is also affected by variations of the bay-substituents. Thus, increasing the steric demand of the bay-substituents leads to an enlargement of the twist angles of the PBI cores as revealed by DFT calculations.
Especially the 1,7-dimethoxy bay-substituted MeO-PBI proved to be very well-suited for the studies envisioned within this thesis. The self-assembly of this PBI derivative was analyzed in detail by UV/vis, fluorescence and FT-IR spectroscopy as well as atomic force microscopy (Chapter 3). These studies revealed that MeO-PBI forms in a solvent mixture of methylcyclohexane and toluene (2:1, v/v) kinetically trapped off-pathway H-aggregated nanoparticles upon fast cooling of a monomeric solution from 90 to 20 °C. However, upon slow cooling of the monomer solution fluorescent J-type nanofibers are formed by π π interactions and intermolecular hydrogen-bonding.
The kinetically metastable off-pathway H-aggregates can be transformed into the thermodynamically more favored J-type aggregates by addition of seeds, which are produced by ultrasonication of the polymeric nanofibers. Interestingly, the living character of this seed-induced supramolecular polymerization process was proven by a newly designed multicycle polymerization experimental protocol. This living polymerization experiment clearly proves, that the polymerization can only occur at the “active” ends of the polymeric seed and that almost no recombination or chain termination processes are present. Hence, the approach of living supramolecular polymerization enables the formation of supramolecular polymers with controlled length and narrow polydispersity.
In Chapter 4 the copolymerization of MeO-PBI with the structurally similar 1,7-dichloro (Cl-PBI) and 1,7-dimethylthio (MeS-PBI) bay-substituted PBIs is studied in detail. Both PBIs form analogous to MeO-PBI kinetically trapped off-pathway aggregates, which can be converted into the thermodynamically stable supramolecular polymers by seed-induced living supramolecular polymerization under precise kinetic control. However, the stability of the kinetically trapped aggregates of Cl-PBI and MeS-PBI is distinctly reduced compared to that of MeO-PBI, because the π-π-interactions of the kinetically metastable aggregates are hampered through the increased twisting of the PBI-cores of the former PBIs. UV/vis studies revealed that the two-component seeded copolymerization of the kinetically trapped state of MeO-PBI with seeds of Cl-PBI leads to the formation of unprecedented supramolecular block copolymers with A-B-A pattern by a living supramolecular polymerization process at the termini of the seeds. Remarkably, the resulting A-B-A block pattern of the obtained copolymers was clearly confirmed by atomic force microscopy studies as the respective blocks formed by the individual monomeric units could be distinguished by the pitches of the helical nanofibers.
Moreover, detailed UV/vis and AFM studies have shown that by inverted two-component seed-induced polymerization, e.g., upon addition of seeds of MeO-PBI to the kinetically trapped aggregates of Cl-PBI, triblock supramolecular copolymers with B-A-B pattern can be generated. The switching of the block pattern could only be achieved because of the perfectly matching conditions for the copolymerization process and the tailored molecular geometry of the individual building blocks of both PBIs. These studies have demonstrated for the first time, that the block pattern of a supramolecular copolymer can be modulated by the experimental protocol through the approach of living supramolecular polymerization. Furthermore, by UV/vis analysis of the living copolymerization of MeO-PBI and MeS-PBI similar results were obtained showing also the formation of both A-B-A and B-A-B type supramolecular block copolymers. Although for these two PBIs the individual blocks could not be identified by AFM because the helical nanofibers of both PBIs exhibit identical helical pitches, these studies revealed for the first time that the approach of seeded living polymerization is not limited to a special pair of monomeric building blocks.
In the last part of the thesis (Chapter 5) a systematic study on the two-component living copolymerization of PBIs with various sterical demanding bay-substituents is provided. Thus, a series of PBIs containing identical hydrogen-bonding amide groups in imide position but variable number (1-MeO-PBI, MeO-PBI, 1,6,7-MeO-PBI, 1,6,7,12-MeO-PBI) or size (EtO-PBI, iPrO-PBI) of alkoxy bay-substituents was investigated. The molecular geometry of the monomeric building blocks has a strong impact on the thermodynamically and even more pronounced on the kinetically controlled aggregation in solvent mixtures of MCH and Tol. While the mono- and dialkoxy-substituted PBIs form kinetically metastable species, the self-assembly of the tri- and tetramethoxy-substituted PBIs (1,6,7-MeO-PBI and 1,6,7,12-MeO-PBI) is completely thermodynamically controlled. The two 1,7-alkoxy substituted PBIs (EtO-PBI, iPrO-PBI) form very similar to MeO-PBI kinetically off-pathway H-aggregates and thermodynamically more favored J-type aggregates. However, the stability of the kinetically metastable state is drastically lower and the conversion into the thermodynamically favored state much faster than for MeO-PBI. In contrast, the monomethoxy-substituted PBI derivative (1-MeO-PBI) forms a kinetically trapped species by intramolecular hydrogen-bonding of the monomers, which can be transformed into the thermodynamically favored nanofibers by seeded polymerization.
Importantly, the two-component seeded copolymerization of the kinetically trapped MeO PBI with seeds of other PBIs of the present series was studied by UV/vis and AFM revealing that the formation of supramolecular block copolymers is only possible for appropriate combinations of PBI building blocks. Thus, the seeded polymerization of the trapped state of the moderately core-twisted MeO-PBI with the, according to DFT-calculations, structurally similar PBIs (EtO-PBI and iPrO-PBI) leads to the formation of A-B-A block copolymers, like in the seeded copolymerization of MeO-PBItrapped with seeds of Cl-PBI and MeS-PBI already described in Chapter 4. However, by addition of seeds of the almost planar PBIs (H-PBI and 1-MeO-PBI) or seeds of the strongly core-twisted PBIs (1,6,7-MeO-PBI and 1,6,7,12-MeO-PBI) to the kinetically trapped state of MeO-PBI no block copolymers can be obtained. The mismatching geometry of these molecular building blocks strongly hampers both the intermolecular hydrogen-bonding and the π-π-interactions between the two different PBIs and consequently prevents the copolymerization process.
Furthermore, the studies of the two-component seeded copolymerization of the kinetically trapped species of 1-MeO-PBI with seeds of the other PBIs also corroborated that a precise shape complementarity is crucial to generate supramolecular block copolymers. Thus, by addition of seeds of H-PBI to the kinetically trapped monomers of 1-MeO-PBI supramolecular block copolymers were generated. Both PBIs exhibit an almost planar PBI core according to DFT-calculations leading to strong non-covalent interactions between these PBIs. This perfectly matching geometry of both PBIs also enables the inverted seeded copolymerization of the kinetically trapped monomers of H-PBI with 1-MeO-PBIseed concomitant with a switching of the block pattern of the supramolecular copolymer from A-B-A to B-A-B type. In contrast, the seeding with the moderately twisted (MeO-PBI, EtO-PBI and iPrO-PBI) and the strongly twisted PBIs (1,6,7-MeO-PBI and 1,6,7,12 MeO-PBI) has no effect on the kinetically trapped state of 1-MeO-PBI, because the copolymerization of these PBIs is prevented by the mismatching geometry of the molecular building blocks.
In conclusion, the supramolecular polymerization and two-component seeded copolymerization of a series of PBI monomers was investigated within this thesis. The studies revealed that the thermodynamically and kinetically controlled self-assembly can be strongly modified by subtle changes of the monomeric building blocks. Moreover, the results have shown that living supramolecular polymerization is an exceedingly powerful method to generate unprecedented supramolecular polymeric nanostructures with controlled block pattern and length distribution. The formation of supramolecular block copolymers can only be achieved under precise kinetic control of the polymerization process and is strongly governed by the shape complementarity already imparted in the individual components. Thus, these insightful studies might enable a more rational design of monomeric building blocks for the non-covalent synthesis of highly complex supramolecular architectures with interesting properties for possible future applications, e.g., as novel functional materials.
Kostimulatorische Signalwege spielen beim Zustandekommen einer T-Zell-gebundenen Effektor-Immunantwort eine entscheidende Rolle. In dieser Arbeit wurde die Expression der Signalwege PD-1/PD-L1 und CD137/CD137L im kolorektalen Karzinom untersucht. Hierzu wurde die Expression in den Karzinomen SW480, SW620 und HT-29 mittels qRT-PCR, Western Blot und FACS analysiert.
Es konnte gezeigt werden, dass PD-1 und CD137 sowie deren Rezeptoren PD-L1 und CD137L im Kolonkarzinom auf Gen- und Proteinebene exprimiert werden. Zunehmendes Tumorzellwachstum sowie mangelnde Nährstoffversorgung führten zu deutlichen Veränderungen im Expressionsmuster, wobei sich zwischen den Kolonkarzinomen SW480/SW620 und dem Kolonkarzinom HT-29 Unterschiede aufzeigen ließen.
Durch die Untersuchungen für diese Arbeit konnten wertvolle Informationen über das Expressionsverhalten der untersuchten kostimulatorischen Signalwege gewonnen werden. Eine mögliche Schlussfolgerung ist, dass eine inhibierende PD-1/PD-L1- als auch eine CD137/CD137L-Tumorzell-vermittelte Therapie die Tumorimmunantwort gegen das kolorektale Karzinom stärken und damit das Überleben betroffener Patienten verbessern könnte.
Bestimmung von genetischen Veränderungen auf PANX 1-3 anhand von Einzelnukleotid Polymorphismen (SNP). Test auf Assoziation von Allelen und Haplotypen mit den schizophrenen Psychosen nach ICD-10 und der Klassifikation von Karl Leonhard in Form einer Fall-Kontroll-Studie mit 1163 Patienten und 479 Kontrollen.
Chronic Kidney Disease as an Important Co-morbid Condition in Coronary Heart Disease Patients
(2019)
In patients with coronary heart disease (CHD) the control of the modifiable “traditional” cardiovascular risk factors such as hypertension, dyslipidemia, diabetes, achieving/maintaining normal body weight and smoking cessation is of major importance to improve prognosis. Guideline recommendations for secondary CHD prevention include specific treatment targets for blood pressure, lipid levels, and markers of glucose metabolism for both younger and older patients. Chronic kidney disease (CKD) has been identified as a “non-traditional” risk factor for worse outcome in CHD patients, as it is associated with a markedly increased risk for subsequent CV events and mortality.
The specific objectives of the current thesis-project are to investigate (a) the quality of care in a recent sample of German CHD patients and to investigate variation of risk factor control between younger and elder patients (≤70 versus >70 years), (b) to analyze the prevalence of CKD across Europe in stable CHD patients in the outpatient setting and during a hospital stay for CHD, (c) to investigate the level of awareness of CKD in German CHD patients and their treating physicians.
Data from the European-wide EUROASPIRE IV study were used that include data on 7998 CHD patients in the ambulatory setting (study visit) and during a hospital stay for CHD (index). The German EUROASPIRE IV study center in Würzburg recruited 536 patients in 2012-2013. Risk factor control was compared against the current recommendations of the European Society of Cardiology. CKD was described by stages of glomerular filtration rate (eGFR) and albuminuria. German patients were asked in an additional kidney specific module whether they have ever been told by a physician about renal impairment. The fact that CKD or acute kidney injury (AKI) was mentioned in prominent parts of the hospital discharge letter as well as correct ICD-coding of CKD or AKI served as a proxy for physician’s awareness of CKD.
The majority of German CHD patients was treated with the recommended drug therapies including e.g. β-blockers, anti-platelets and statins. However, treatment targets for blood pressure and LDL-cholesterol levels were not achieved in many patients (45% and 53%, respectively) and glycemic control in diabetic CHD patients with HbA1-levels <7% was insufficient (61%). A minority of patients reported on current smoking (10%), but unhealthy life-styles e.g. overweight/obesity (85%/37%) were frequent. Patterns of care differed between younger and older CHD patients while older patients were less likely to receive the recommended medical CHD-therapy, were more likely to have uncontrolled blood pressure and also to be diabetic. However, a greater proportion of diabetic patients >70 years was achieving the HbA1c target, and less elder patients were current smokers or were obese. About 17% of patients on average had CKD (eGFR< 60 ml/min/1.73m²) in the entire European sample at the study visit, and an additional 10% had albuminuria despite preserved eGFR, with considerable variation among countries. Impaired kidney function was observed in every fifth patient admitted for CHD in the entire European dataset of the EUROASPIRE IV study. Of the German CHD patients with CKD at the study visit, only a third were aware of their renal impairment. A minority of these patients was being seen by nephrologists, however, with a higher likelihood of CKD awareness and specialist care in more advanced stages of CKD. About a third of patients admitted for CHD showed either CKD or AKI during the hospital stay, but the discharge letter mentioned chronic or acute kidney disease only in every fifth of these patients. In contrast, correct ICD coding of CKD or AKI was more complete, but still suboptimal.
In summary, quality of secondary prevention in German CHD patients indicates considerably room for improvement, with life-style modifications may become an even greater factor in prevention campaigns than medical treatment into certain target ranges. Preventive therapies should also consider different needs in older individuals acknowledging physical and mental potential, other comorbidities and drug-interactions with co-medication. CKD is common in CHD patients, not only in the elderly. Since CHD and CKD affect each other and impact on worse prognosis of each other, raising the awareness of CKD among patients and physicians and considering CKD in medical therapy may improve prognosis and slow disease progression of CHD as well as CKD.
Background
Epidural catheters are state of the art for postoperative analgesic in abdominal surgery. Due to neurolysis it can lead to postoperative urinary tract retention (POUR), which leads to prolonged bladder catheterization, which has an increased risk for urinary tract infections (UTI). Our aim was to identify the current perioperative management of urinary catheters and, second, to identify the optimal time of suprapubic bladder catheter removal in regard to the removal of the epidural catheter.
Methods
We sent a questionnaire to 102 German hospitals and analyzed the 83 received answers to evaluate the current handling of bladder drainage and epidural catheters. Then, we conducted a retrospective study including 501 patients, who received an epidural and suprapubic catheter after abdominal surgery at the University Hospital Würzburg. We divided the patients into three groups according to the point in time of suprapubic bladder drainage removal in regard to the removal of the epidural catheter and analyzed the onset of a UTI.
Results
Our survey showed that in almost all hospitals (98.8%), patients received an epidural catheter and a bladder drainage after abdominal surgery. The point in time of urinary catheter removal was equally distributed between before, simultaneously and after the removal of the epidural catheter (respectively: ~28–29%). The retrospective study showed a catheter-associated UTI in 6.7%. Women were affected significantly more often than men (10,7% versus 2,5%, p<0.001). There was a non-significant trend to more UTIs when the suprapubic catheter was removed after the epidural catheter (before: 5.7%, after: 8.4%).
Conclusion
The point in time of suprapubic bladder drainage removal in relation to the removal of the epidural catheter does not seem to correlate with the rate of UTIs. The current handling in Germany is inhomogeneous, so further studies to standardize treatment are recommended.
Die hier vorgelegte geographisch-historische Abhandlung basiert auf dem Vergleich von zwei im zeitlichen Abstand von ca 60 Jahren (1958/59 = Dissertation und 2016/17 = wiederholendes Geländeprojekt) erfolgten Untersuchungen zum Verlauf und zum morphologischen Ergebnis von Bodenerosion nach akuten Starkregen sowie infolge schleichend-langfristiger Abspülung von Feinboden in verschiedenen Relieftypen des Taubertalgebietes. Alle Vorgänge der Bodenabtragung erfuhren erhebliche Differenzierung durch die unterschiedlichen Verfahren der landwirtschaftlichen Nutzung (z.B. Weinbau, Ackerbau,Viehhaltung). In zeitlichem Vergleich der einzelnen Lokalitäten und Fallstudien (Kartierung, Fotografie, Datenerfassung)konnte einerseits Abschwächung, andererseits Verstärkung der Bodenabspülung festgesetllt werden. Um längerfristig rückblickend die Wirkungsweise der flächen- u. linienhaften Bodenabtragung einzubeziehen, wurden historisch-archivalische Berichte über Folgen von Witterungsereignissen einbezogen und als Auswahl entsprechend der verschiedenen Bodennutzungsarten zusammengestellt. Diese Belege geben Aufschluss über historische Methoden und Techniken zur Verminderung erosionsbedingter Bodenverluste und damit zur Vermeidung existenzmindernder Ernteschäden. Mit diesem Rückblick ergaben sich auch Hinweise auf Phasen historisch-klimatisch veränderter Niederschlagsregime. Im Hinblick auf die durch den Klimawandel zu erwartende Zunahme der Starkregenanteile ergibt sich die Notwendigkeit, den Oberflächenabfluss von Regenmengen und damit deren Erosionskraft durch bodenschonende Nutzungsweisen zu verlangsamen.
Cristae architecture is important for the function of mitochondria, the organelles that play the central role in many cellular processes. The mitochondrial contact site and cristae organizing system (MICOS) together with the sorting and assembly machinery (SAM) forms the mitochondrial intermembrane space bridging complex (MIB), a large protein complex present in mammalian mitochondria that partakes in the formation and maintenance of cristae. We report here a new subunit of the mammalian MICOS/MIB complex, an armadillo repeat-containing protein 1 (ArmC1). ArmC1 localizes both to cytosol and mitochondria, where it associates with the outer mitochondrial membrane through its carboxy-terminus. ArmC1 interacts with other constituents of the MICOS/MIB complex and its amounts are reduced upon MICOS/MIB complex depletion. Mitochondria lacking ArmC1 do not show defects in cristae structure, respiration or protein content, but appear fragmented and with reduced motility. ArmC1 represents therefore a peripheral MICOS/MIB component that appears to play a role in mitochondrial distribution in the cell.
Solitary bees build their nests by modifying the interior of natural cavities, and they provision them with food by importing collected pollen. As a result, the microbiota of the solitary bee nests may be highly dependent on introduced materials. In order to investigate how the collected pollen is associated with the nest microbiota, we used metabarcoding of the ITS2 rDNA and the 16S rDNA to simultaneously characterize the pollen composition and the bacterial communities of 100 solitary bee nest chambers belonging to seven megachilid species. We found a weak correlation between bacterial and pollen alpha diversity and significant associations between the composition of pollen and that of the nest microbiota, contributing to the understanding of the link between foraging and bacteria acquisition for solitary bees. Since solitary bees cannot establish bacterial transmission routes through eusociality, this link could be essential for obtaining bacterial symbionts for this group of valuable pollinators.
Zahlreiche humanpathogene bakterielle Erreger können ihre Fähigkeit zur Kolonisation epithelialer Barrieren optimieren, indem sie mit dem Zellzyklus der infizierten Wirtszelle in Wechselwirkung treten und so die Abschilferung und Erneuerung des Epithels verzögern. Die hierbei wirksamen bakteriellen Effektoren sind als „Cyclomoduline“ bekannt und gelten als neue Klasse bakterieller Pathogenitätsfaktoren. Ziel der vorliegenden Promotionsarbeit war es zu untersuchen, ob durch die Infektion menschlicher pharyngealer Epithelzellen mit N. meningitidis der Zellzyklus der Wirtszelle beeinflusst wird. Mit zwei verschiedenen Untersuchungsmethoden konnte übereinstimmend gezeigt werden, dass die Infektion der Epithelzelllinie Detroit 562 mit verschiedenen Meningokokkenisolaten zu einer signifikanten Akkumulation von Epithelzellen in der G1-Phase führte. Dieser Effekt wurde sowohl von pathogenen Meningokokkenstämmen als auch von Trägerstämmen ausgelöst, jedoch nur durch Isolate, die fähig zur Adhärenz und zur Invasion in die Epithelzelle waren. Durch Hitzebehandlung der Bakterien konnte der Zellzyklusarrest vollständig aufgehoben werden. Ebenso konnte der Effekt durch Inkubation der Epithelzellen mit bakteriellen Kulturüberständen und durch Infektion der Zellen mit E. coli-Stämmen, welche die Meningokokkenadhäsine Opa und Opc überexprimieren, nicht ausgelöst werden.
Es konnte weiterhin nachgewiesen werden, dass die Infektion mit N. meningitidis in der Zielzelle zu einer signifikant gesteigerten Expression des CDK-Inhibitors p21WAF1/Cip1 führte, begleitet von einer vermehrten Lokalisation im Zellkern. Auch zeigte sich eine veränderte Proteinexpression der für die G1-Phase relevanten Cycline D und E. Diese scheint sich erst posttranslational zu ereignen, da die unterschiedliche Expression auf mRNA-Ebene nicht festgestellt werden konnte.
Zusammenfassend konnte dargestellt werden, dass die Infektion von Pharynxepithelzellen mit lebenden, zur Adhärenz und Invasion fähigen Meningokokkenstämmen in der menschlichen Zielzelle einen Zellzyklusarrest in der G1-Phase verursacht, vermutlich durch veränderte Expression der Zellzyklusregulatoren p21WAF1/Cip1, Cyclin D und Cyclin E. Möglicherweise stellt die Induktion dieses Zellzyklusarrestes einen wichtigen Schritt in der Pathogenese der bakteriellen Kolonisation des oberen Atemwegsepithels durch N. meningitidis dar.
Energy efficiency of computing systems has become an increasingly important issue over the last decades. In 2015, data centers were responsible for 2% of the world's greenhouse gas emissions, which is roughly the same as the amount produced by air travel.
In addition to these environmental concerns, power consumption of servers in data centers results in significant operating costs, which increase by at least 10% each year.
To address this challenge, the U.S. EPA and other government agencies are considering the use of novel measurement methods in order to label the energy efficiency of servers.
The energy efficiency and power consumption of a server is subject to a great number of factors, including, but not limited to, hardware, software stack, workload, and load level.
This huge number of influencing factors makes measuring and rating of energy efficiency challenging. It also makes it difficult to find an energy-efficient server for a specific use-case. Among others, server provisioners, operators, and regulators would profit from information on the servers in question and on the factors that affect those servers' power consumption and efficiency. However, we see a lack of measurement methods and metrics for energy efficiency of the systems under consideration.
Even assuming that a measurement methodology existed, making decisions based on its results would be challenging. Power prediction methods that make use of these results would aid in decision making. They would enable potential server customers to make better purchasing decisions and help operators predict the effects of potential reconfigurations.
Existing energy efficiency benchmarks cannot fully address these challenges, as they only measure single applications at limited sets of load levels. In addition, existing efficiency metrics are not helpful in this context, as they are usually a variation of the simple performance per power ratio, which is only applicable to single workloads at a single load level. Existing data center efficiency metrics, on the other hand, express the efficiency of the data center space and power infrastructure, not focusing on the efficiency of the servers themselves. Power prediction methods for not-yet-available systems that could make use of the results provided by a comprehensive power rating methodology are also lacking. Existing power prediction models for hardware designers have a very fine level of granularity and detail that would not be useful for data center operators.
This thesis presents a measurement and rating methodology for energy efficiency of servers and an energy efficiency metric to be applied to the results of this methodology. We also design workloads, load intensity and distribution models, and mechanisms that can be used for energy efficiency testing. Based on this, we present power prediction mechanisms and models that utilize our measurement methodology and its results for power prediction.
Specifically, the six major contributions of this thesis are:
We present a measurement methodology and metrics for energy efficiency rating of servers that use multiple, specifically chosen workloads at different load levels for a full system characterization.
We evaluate the methodology and metric with regard to their reproducibility, fairness, and relevance. We investigate the power and performance variations of test results and show fairness of the metric through a mathematical proof and a correlation analysis on a set of 385 servers. We evaluate the metric's relevance by showing the relationships that can be established between metric results and third-party applications.
We create models and extraction mechanisms for load profiles that vary over time, as well as load distribution mechanisms and policies. The models are designed to be used to define arbitrary dynamic load intensity profiles that can be leveraged for benchmarking purposes. The load distribution mechanisms place workloads on computing resources in a hierarchical manner.
Our load intensity models can be extracted in less than 0.2 seconds and our resulting models feature a median modeling error of 12.7% on average. In addition, our new load distribution strategy can save up to 10.7% of power consumption on a single server node.
We introduce an approach to create small-scale workloads that emulate the power consumption-relevant behavior of large-scale workloads by approximating their CPU performance counter profile, and we introduce TeaStore, a distributed, micro-service-based reference application. TeaStore can be used to evaluate power and performance model accuracy, elasticity of cloud auto-scalers, and the effectiveness of power saving mechanisms for distributed systems.
We show that we are capable of emulating the power consumption behavior of realistic workloads with a mean deviation less than 10% and down to 0.2 watts (1%). We demonstrate the use of TeaStore in the context of performance model extraction and cloud auto-scaling also showing that it may generate workloads with different effects on the power consumption of the system under consideration.
We present a method for automated selection of interpolation strategies for performance and power characterization. We also introduce a configuration approach for polynomial interpolation functions of varying degrees that improves prediction accuracy for system power consumption for a given system utilization.
We show that, in comparison to regression, our automated interpolation method selection and configuration approach improves modeling accuracy by 43.6% if additional reference data is available and by 31.4% if it is not.
We present an approach for explicit modeling of the impact a virtualized environment has on power consumption and a method to predict the power consumption of a software application. Both methods use results produced by our measurement methodology to predict the respective power consumption for servers that are otherwise not available to the person making the prediction.
Our methods are able to predict power consumption reliably for multiple hypervisor configurations and for the target application workloads. Application workload power prediction features a mean average absolute percentage error of 9.5%.
Finally, we propose an end-to-end modeling approach for predicting the power consumption of component placements at run-time. The model can also be used to predict the power consumption at load levels that have not yet been observed on the running system.
We show that we can predict the power consumption of two different distributed web applications with a mean absolute percentage error of 2.2%. In addition, we can predict the power consumption of a system at a previously unobserved load level and component distribution with an error of 1.2%.
The contributions of this thesis already show a significant impact in science and industry. The presented efficiency rating methodology, including its metric, have been adopted by the U.S. EPA in the latest version of the ENERGY STAR Computer Server program. They are also being considered by additional regulatory agencies, including the EU Commission and the China National Institute of Standardization. In addition, the methodology's implementation and the underlying methodology itself have already found use in several research publications.
Regarding future work, we see a need for new workloads targeting specialized server hardware. At the moment, we are witnessing a shift in execution hardware to specialized machine learning chips, general purpose GPU computing, FPGAs being embedded into compute servers, etc. To ensure that our measurement methodology remains relevant, workloads covering these areas are required. Similarly, power prediction models must be extended to cover these new scenarios.
Kationenkanäle der Canonical Transient Receptor (TRPC)-Familie spielen eine wichtige Rolle in der pathologischen Herzhypertrophie. Neben anderen Isoformen besitzt TRPC4 die Potenz, den strukturellen und funktionellen Umbau des Herzens im Rahmen der pathologischen Hypertrophie über Ca2+-Transienten zu bestärken. TRPC4-Kanäle sind nicht-selektive Kationenkanäle, die für Na+ und Ca2+ durchlässig sind. Sie setzen sich in der Plasmamembran zu Homo- oder Heterotetrameren zusammen. Die TRPC4-Kanalaktivität wird durch die Stimulation von Gq-Protein-gekoppelten Rezeptoren (GPCR) reguliert und führt zu einem Ca2+-Einstrom, der für die Aktivierung von Calcineurin und des nuclear factor of activated T-cells (NFAT) notwendig ist. Eine weitere Aktivierungsform lässt sich über die Entleerung von intrazellulären Ca2+-Speichern (SOCE) aus dem Sarkoplasmatischen Retikulum (SR) nachweisen. Die funktionelle Wirkung des TRPC4 ist von der Expression der beiden Splice-Varianten TRPC4α und TRPC4β abhängig.
Um diese funktionelle Abhängigkeit der Splice-Variante C4β genauer zu charakterisieren, wurden in der vorliegenden Studie zytosolische Ca2+-Signale und deren Aktivierungsmechanismen analysiert. Für die Untersuchungen wurden neonatale Rattenkardiomyozyten (NRC) verwendet, die mit adenoviralen Vektoren infiziert wurden und TRPC4beta (Ad-TRPC4β), TRPC4alpha (Ad-TRPC4α) und beta-Galaktosidase (Ad-ßgal) als Kontrolle exprimierten. Es erfolgte eine Auswertung der Ca2+-Transienten, in der gezeigt werden konnte, dass TRPC4β den Ca2+-Einstrom in schlagenden Kardiomyozyten beeinflusst. Dies machte sich in einer erhöhten Ca2+-Amplitude unter basalen Bedingungen bemerkbar. Ebenfalls konnte deutlich gemacht werden, dass eine Ca2+-Entleerung des SR TRPC4β als sogenannten SOC (speicher-regulierten Kanal, store-operated channel) aktiviert. Außerdem reagierten TRPC4β-infizierte NRCs mit einem gesteigerten Ca2+-Maximalspitzenwert (peak) unter Stimulation mit dem GPCR-Agonisten Angiotensin II. Die Amplitude der Ca2+-Transienten bei Überexpression von Ad-TRPC4β war im Vergleich zur Ad-ßgal-Kontrollgruppe deutlich gesteigert. Darüber hinaus war der Abfall der Ca2+-Transienten der TRPC4β-exprimierenden Zellen beschleunigt. Dies lässt einen kompensatorischen Mechanismus vermuten, mit dem Ziel, einer Ca2+-Überladung der Zelle durch den TRPC4β-induzierten Ca2+-Einstrom entgegenzuwirken. In zusätzlichen Experimenten zeigte sich TRPC4β ebenfalls deutlich sensitiver gegenüber der Angiotensin II-Stimulation als TRPC4α. Weiterführende Untersuchungen ließen erkennen, dass TRPC4β, im Gegensatz zu anderen TRPC-Isoformen, keinen pro-hypertrophen, sondern vielmehr einen pro-apoptotischen Einfluss auf Kardiomyozyten ausübt.
Zusammenfassend zeigt die vorliegende Studie, dass eine erhöhte Aktivität der Splice-Variante TRPC4β mit kritischen Veränderungen zytosolischer Ca2+-Signale verbunden ist und somit ein entscheidender Faktor für die Entstehung und Progression kardialer Pathologien sein könnte.
Kationenkanäle der Canonical Transient Receptor (TRPC)-Familie spielen eine wichtige Rolle in der pathologischen Herzhypertrophie. Neben anderen Isoformen besitzt TRPC4 die Potenz, den strukturellen und funktionellen Umbau des Herzens im Rahmen der pathologischen Hypertrophie über Ca2+-Transienten zu bestärken. TRPC4-Kanäle sind nicht-selektive Kationenkanäle, die für Na+ und Ca2+ durchlässig sind. Sie setzen sich in der Plasmamembran zu Homo- oder Heterotetrameren zusammen. Die TRPC4-Kanalaktivität wird durch die Stimulation von Gq-Protein-gekoppelten Rezeptoren (GPCR) reguliert und führt zu einem Ca2+-Einstrom, der für die Aktivierung von Calcineurin und des nuclear factor of activated T-cells (NFAT) notwendig ist. Eine weitere Aktivierungsform lässt sich über die Entleerung von intrazellulären Ca2+-Speichern (SOCE) aus dem Sarkoplasmatischen Retikulum (SR) nachweisen. Die funktionelle Wirkung des TRPC4 ist von der Expression der beiden Splice-Varianten TRPC4α und TRPC4β abhängig.
Um diese funktionelle Abhängigkeit der Splice-Variante C4β genauer zu charakterisieren, wurden in der vorliegenden Studie zytosolische Ca2+-Signale und deren Aktivierungsmechanismen analysiert. Für die Untersuchungen wurden neonatale Rattenkardiomyozyten (NRC) verwendet, die mit adenoviralen Vektoren infiziert wurden und TRPC4beta (Ad-TRPC4β), TRPC4alpha (Ad-TRPC4α) und beta-Galaktosidase (Ad-ßgal) als Kontrolle exprimierten. Es erfolgte eine Auswertung der Ca2+-Transienten, in der gezeigt werden konnte, dass TRPC4β den Ca2+-Einstrom in schlagenden Kardiomyozyten beeinflusst. Dies machte sich in einer erhöhten Ca2+-Amplitude unter basalen Bedingungen bemerkbar. Ebenfalls konnte deutlich gemacht werden, dass eine Ca2+-Entleerung des SR TRPC4β als sogenannten SOC (speicher-regulierten Kanal, store-operated channel) aktiviert. Außerdem reagierten TRPC4β-infizierte NRCs mit einem gesteigerten Ca2+-Maximalspitzenwert (peak) unter Stimulation mit dem GPCR-Agonisten Angiotensin II. Die Amplitude der Ca2+-Transienten bei Überexpression von Ad-TRPC4β war im Vergleich zur Ad-ßgal-Kontrollgruppe deutlich gesteigert. Darüber hinaus war der Abfall der Ca2+-Transienten der TRPC4β-exprimierenden Zellen beschleunigt. Dies lässt einen kompensatorischen Mechanismus vermuten, mit dem Ziel, einer Ca2+-Überladung der Zelle durch den TRPC4β-induzierten Ca2+-Einstrom entgegenzuwirken. In zusätzlichen Experimenten zeigte sich TRPC4β ebenfalls deutlich sensitiver gegenüber der Angiotensin II-Stimulation als TRPC4α. Weiterführende Untersuchungen ließen erkennen, dass TRPC4β, im Gegensatz zu anderen TRPC-Isoformen, keinen pro-hypertrophen, sondern vielmehr einen pro-apoptotischen Einfluss auf Kardiomyozyten ausübt.
Zusammenfassend zeigt die vorliegende Studie, dass eine erhöhte Aktivität der Splice-Variante TRPC4β mit kritischen Veränderungen zytosolischer Ca2+-Signale verbunden ist und somit ein entscheidender Faktor für die Entstehung und Progression kardialer Pathologien sein könnte.
Synapse-associated protein 1 (Syap1) is the mammalian homologue of synapse-associated protein of 47 kDa (Sap47) in Drosophila. Genetic deletion of Sap47 leads to deficiencies in short-term plasticity and associative memory processing in flies. In mice, Syap1 is prominently expressed in the nervous system, but its function is still unclear. We have generated Syap1 knockout mice and tested motor behaviour and memory. These mice are viable and fertile but display distinct deficiencies in motor behaviour. Locomotor activity specifically appears to be reduced in early phases when voluntary movement is initiated. On the rotarod, a more demanding motor test involving control by sensory feedback, Syap1-deficient mice dramatically fail to adapt to accelerated speed or to a change in rotation direction. Syap1 is highly expressed in cerebellar Purkinje cells and cerebellar nuclei. Thus, this distinct motor phenotype could be due to a so-far unknown function of Syap1 in cerebellar sensorimotor control. The observed motor defects are highly specific since other tests in the modified SHIRPA exam, as well as cognitive tasks like novel object recognition, Pavlovian fear conditioning, anxiety-like behaviour in open field dark-light transition and elevated plus maze do not appear to be affected in Syap1 knockout mice.
In der antiretroviralen Therapie bei Kindern bleibt die Rolle von Therapeutischem Drug Monitoring bisher unklar.
Es war Ziel vorliegender Arbeit, bei Kindern unter antiretroviraler Therapie (ART) in Südafrika die Lopinavir (LPV) und Efavirenz (EFV) Serumkonzentrationen in der klinischen Routine zu messen und Risikofaktoren für unzureichende Medikamentenexposition zu identifizieren.
Zu diesem Zweck wurde eine prospektive Erhebung im Tygerberg Hospital, Stellenbosch durchgeführt.
Siebenundfünfzig Serumkonzentrationen von 53 Patienten wurden mit einer etablierten High-performance liquid Chromatography (HPLC) Methode im Universitätsklinikum Würzburg gemessen.
Für Efavirenz wird in der Literatur ein therapeutischer Bereich von 1.000-4.000 ng/ml empfohlen. Bei Lopinavir wurden die Serumkonzentrationen vorliegender Arbeit ins Verhältnis zu der pharmakokinetischen Größe Cmin von 5.500 ng/ml gesetzt.
Es wurde das Serum von 53 HIV-infizierten Kindern im Alter von 0,2-15,8 Jahren untersucht. Insgesamt zeigten 12 Kinder Serumkonzentrationen außerhalb des therapeutischen Bereichs bei EFV oder kleiner Cmin bei LPV.
Eine LPV-haltige ART nahmen 29 der Kinder ein (Medianalter 1,83 Jahre). Eine Messung der Konzentration von Lopinavir zeigte eine mittlere Serumkonzentration von 8.618±6018 (nicht nachweisbar-24.629) ng/ml. 17% der LPV-Serumkonzentrationen waren kleiner Cmin. Bei der Untersuchung folgender Faktoren zeigten sich keine signifikanten Unterschiede der mittleren Serumkonzentrationen und keine Assoziation mit Serumkonzentrationen <Cmin: Geschlecht, Dauer der ART <12 Monate, Anzahl der CD4-Lymphozyten, Viruslast, Komorbiditäten und angegebene Therapieadhärenz.
Kinder im fortgeschrittenen HIV-Stadium nach World Health Organization (WHO) Stadium IV zeigten mit 6.817±4.273 ng/ml niedrigere LPV-Serumkonzentrationen als Kinder in WHO Stadien I, II, III mit 11.331±6.819 ng/ml. Der Unterschied war allerdings nicht signifikant. (p=0,074)
Tendenziell waren die LPV-Serumkonzentrationen bei Kindern mit Untergewicht (n=9) mit 6.859±4.322 ng/ml niedriger als bei normalgewichtigen Kindern (n=9) mit einer mittleren LPV-Serumkonzentration von 10.542±6.275 ng/ml (p=0,133). Es fiel weiterhin auf, dass 3 von 10 Kinder mit gastroenteritischen Symptomen in den letzten sieben Tagen Serumkonzentrationen <Cmin zeigten. (p=0,358)
Ein ART-Regime mit dem Nicht-Nukleosidischen Reverse-Transkriptase-Inhibitor Efavirenz nahmen 24 der untersuchten Kinder ein (Medianalter 9,3 Jahre). Die Zeit von EFV-Einnahme bis zur Blutentnahme variierte zwischen 12 und 19 Stunden. Es konnte eine große Varianz mit 156-36.340 ng/ml gemessen werden. Im Mittel war die Serumkonzentration 4.049±6862 ng/ml. 27% der Serumkonzentrationen lagen außerhalb des therapeutischen Bereichs.
Für folgende Faktoren zeigte sich keine signifikante Assoziation mit nicht-therapeutischen EFV-Serumkonzentrationen: Geschlecht, WHO Stadium, Dauer der ART >12 Monate, HI-Viruslast, Komorbiditäten, Untergewicht und angegebene Therapieadhärenz.
Kinder mit CD4-Lymphozyten <350 Zellen/µl Blut zeigten signifikant häufiger Serumkonzentrationen außerhalb des therapeutischen Bereichs als Kinder mit >350 CD4-Lymphozyten/µl Blut. (p=0,016)
Bei dem Vergleich des Anteils der EFV-Serumkonzentrationen im therapeutischen Bereich zeigte sich ein signifikanter Unterschied zwischen ambulant vorgestellten versus hospitalisierten Patienten (p=0.009). Es ließ sich eine Assoziation zwischen hospitalisierten Patienten und nicht-therapeutischen Serumkonzentrationen finden.
Es zeigte sich außerdem bei Kindern, die eine Rifampicin-haltige tuberkulostatische Therapie gleichzeitig zur ART einnahmen, ein Trend zu nicht therapeutischen EFV-Serumkonzentrationen (p=0,076) bei sehr kleiner Fallzahl.
Die Ergebnisse dieser Arbeit zeigen, zusammen mit den Ergebnissen anderer Studien, dass mithilfe von Therapeutischem Drug Monitoring von Efavirenz und Lopinavir Risikosituationen für Therapieversagen oder Medikamententoxizität frühzeitig erkannt werden können.
Magnetic Particle Imaging (MPI) is a promising new tomographic modality for fast as well as three-dimensional visualization of magnetic material. For anatomical or structural information an additional imaging modality such as computed tomography (CT) is required. In this paper, the first hybrid MPI-CT scanner for multimodal imaging providing simultaneous data acquisition is presented.
Among the Microbacteriaceae the species of Subtercola and Agreia form closely associated clusters. Phylogenetic analysis demonstrated three major phylogenetic branches of these species. One of these branches contains the two psychrophilic species Subtercola frigoramans and Subtercola vilae, together with a larger number of isolates from various cold environments. Genomic evidence supports the separation of Agreia and Subtercola species. In order to gain insight into the ability of S. vilae to adapt to life in this extreme environment, we analyzed the genome with a particular focus on properties related to possible adaptation to a cold environment. General properties of the genome are presented, including carbon and energy metabolism, as well as secondary metabolite production. The repertoire of genes in the genome of S. vilae DB165\(^T\) linked to adaptations to the harsh conditions found in Llullaillaco Volcano Lake includes several mechanisms to transcribe proteins under low temperatures, such as a high number of tRNAs and cold shock proteins. In addition, S. vilae DB165\(^T\) is capable of producing a number of proteins to cope with oxidative stress, which is of particular relevance at low temperature environments, in which reactive oxygen species are more abundant. Most important, it obtains capacities to produce cryo-protectants, and to combat against ice crystal formation, it produces ice-binding proteins. Two new ice-binding proteins were identified which are unique to S. vilae DB165\(^T\). These results indicate that S. vilae has the capacity to employ different mechanisms to live under the extreme and cold conditions prevalent in Llullaillaco Volcano Lake.
The identification of biomarker signatures is important for cancer diagnosis and prognosis. However, the detection of clinical reliable signatures is influenced by limited data availability, which may restrict statistical power. Moreover, methods for integration of large sample cohorts and signature identification are limited. We present a step-by-step computational protocol for functional gene expression analysis and the identification of diagnostic and prognostic signatures by combining meta-analysis with machine learning and survival analysis. The novelty of the toolbox lies in its all-in-one functionality, generic design, and modularity. It is exemplified for lung cancer, including a comprehensive evaluation using different validation strategies. However, the protocol is not restricted to specific disease types and can therefore be used by a broad community. The accompanying R package vignette runs in ~1 h and describes the workflow in detail for use by researchers with limited bioinformatics training.
Background
Early inflammatory processes may play an important role in the development of early brain injury (EBI) after subarachnoid hemorrhage (SAH). Experimental studies suggest that anti-inflammatory and membrane-stabilizing drugs might have beneficial effects, although the underlying mechanisms are not fully understood. The aim of this study was to investigate the effect of early treatment with methylprednisolone and minocycline on cerebral perfusion and EBI after experimental SAH.
Methods
Male Sprague-Dawley rats were subjected to SAH using the endovascular filament model. 30 minutes after SAH, they were randomly assigned to receive an intravenous injection of methylprednisolone (16mg/kg body weight, n=10), minocycline (45mg/kg body weight, n=10) or saline (n=11). Mean arterial blood pressure (MABP), intracranial pressure (ICP) and local cerebral blood flow (LCBF) over both hemispheres were recorded continuously for three hours following SAH. Neurological assessment was performed after 24 hours. Hippocampal damage was analyzed by immunohistochemical staining (caspase 3).
Results
Treatment with methylprednisolone or minocycline did not result in a significant improvement of MABP, ICP or LCBF. Animals of both treatment groups showed a non-significant trend to better neurological recovery compared to animals of the control group. Mortality was reduced and hippocampal damage significantly attenuated in both methylprednisolone and minocycline treated animals.
Conclusion
The results of this study suggest that inflammatory processes may play an important role in the pathophysiology of EBI after SAH. Early treatment with the anti-inflammatory drugs methylprednisolone or minocycline in the acute phase of SAH has the potential to reduce brain damage and exert a neuroprotective effect.
Hematopoietic stem cell transplantation is a curative therapy for malignant diseases of the haematopoietic system. The patients first undergo chemotherapy or irradiation therapy which depletes the majority of tumour cells before they receive the transplant, consisting of haematopoietic stem cells and mature T cells from a healthy donor. The donor T cells kill malignant cells that have not been eliminated by the conditioning therapy (graft versus leukaemia effect, GvL), and, therefore, are crucially required to prevent relapse of the tumour. However, the donor T cells may also severely damage the patient’s organs causing acute graft versus host disease (aGvHD). In mice, aGvHD can be prevented by interfering with the co-stimulatory CD28 signal on donor T cells. However, experimental models using conventional CD28 knockout mice as T cell donors or αCD28 antibodies have some disadvantages, i.e. impaired T cell development in the thymus of CD28 knockout mice and systemic CD28 blockade with αCD28 antibodies. Thus, it remains unclear how CD28 co-stimulation on different donor T cell subsets contributes to the GvL effect and aGvHD, respectively.
We developed mouse models of aGvHD and the GvL effect that allowed to selectively delete CD28 on certain donor T cell populations or on all donor T cells. CD4+ conventional T cells (Tconv cells), regulatory T cells (Treg cells) or CD8+ T cells were isolated from either Tamoxifen-inducible CD28 knockout (iCD28KO) mice or their wild type (wt) littermates. Allogeneic recipient mice were then transplanted with T cell depleted bone marrow cells and different combinations of iCD28KO and wt T cell subsets. Tamoxifen treatment of the recipients caused irreversible CD28 deletion on the iCD28KO donor T cell population. In order to study the GvL response, BCL-1 tumour cells were injected into the mice shortly before transfer of the T cells.
CD4+ Tconv mediated aGvHD was efficiently inhibited when wt Treg cells were co-transplanted. In contrast, after selective CD28 deletion on donor Treg cells, the mice developed a late and lethal flare of aGvHD, i.e. late-onset aGvHD. This was associated with a decline in iCD28KO Treg cell numbers around day 20 after transplantation. CD28 ablation on either donor CD4+ Tconv cells or CD8+ T cells reduced but did not abrogate aGvHD. Moreover, iCD28KO and wt CD8+ T cells were equally capable of killing allogeneic target cells in vivo and in vitro. Due to this sufficient anti-tumour activity of iCD28KO CD8+ T cells, they had a therapeutic effect in our GvL model and 25% of the mice survived until the end of the experiment (day 120) without any sign of the malignant disease. Similarly, CD28 deletion on all donor T cells induced long-term survival. This was not the case when all donor T cells were isolated from wt donor mice. In contrast to the beneficial outcome after CD28 deletion on all donor T cells or only CD8+ T cells, selective CD28 deletion on donor CD4+ Tconv cells completely abrogated the GvL effect due to insufficient CD4+ T cell help from iCD28KO CD4+ Tconv cells.
This study demonstrates that therapeutic inhibition of the co-stimulatory CD28 signal in either all donor T cells or only in CD8+ T cells might protect patients from aGvHD without increasing the risk of relapse of the underlying disease. Moreover, deletion of CD28 on donor Treg cells constitutes a mouse model of late-onset aGvHD which can be a useful tool in aGvHD research.
This study investigates synthetic aperture radar (SAR) time series of the Sentinel-1 mission acquired over the Atacama Desert, Chile, between March 2015 and December 2018. The contribution analyzes temporal and spatial variations of Sentinel-1 interferometric SAR (InSAR) coherence and exemplarily illustrates factors that are responsible for observed signal differences. The analyses are based on long temporal baselines (365–1090 days) and temporally dense time series constructed with short temporal baselines (12–24 days). Results are compared to multispectral data of Sentinel-2, morphometric features of the digital elevation model (DEM) TanDEM-X WorldDEM™, and to a detailed governmental geographic information system (GIS) dataset of the local hydrography. Sentinel-1 datasets are suited for generating extensive, nearly seamless InSAR coherence mosaics covering the entire Atacama Desert (>450 × 1100 km) at a spatial resolution of 20 × 20 meter per pixel. Temporal baselines over several years lead only to very minor decorrelation, indicating a very high signal stability of C-Band in this region, especially in the hyperarid uplands between the Coastal Cordillera and the Central Depression. Signal decorrelation was associated with certain types of surface cover (e.g., water or aeolian deposits) or with actual surface dynamics (e.g., anthropogenic disturbance (mining) or fluvial activity and overland flow). Strong rainfall events and fluvial activity in the periods 2015 to 2016 and 2017 to 2018 caused spatial patterns with significant signal decorrelation; observed linear coherence anomalies matched the reference channel network and indicated actual episodic and sporadic discharge events. In the period 2015–2016, area-wide loss of coherence appeared as strip-like patterns of more than 80 km length that matched the prevailing wind direction. These anomalies, and others observed in that period and in the period 2017–2018, were interpreted to be caused by overland flow of high magnitude, as their spatial location matched well with documented heavy rainfall events that showed cumulative precipitation amounts of more than 20 mm.
Regardless of political boundaries, river basins are a functional unit of the Earth’s land surface and provide an abundance of resources for the environment and humans. They supply livelihoods supported by the typical characteristics of large river basins, such as the provision of freshwater, irrigation water, and transport opportunities. At the same time, they are impacted i.e., by human-induced environmental changes, boundary conflicts, and upstream–downstream inequalities. In the framework of water resource management, monitoring of river basins is therefore of high importance, in particular for researchers, stake-holders and decision-makers. However, land surface and surface water properties of many major river basins remain largely unmonitored at basin scale. Several inventories exist, yet consistent spatial databases describing the status of major river basins at global scale are lacking. Here, Earth observation (EO) is a potential source of spatial information providing large-scale data on the status of land surface properties. This review provides a comprehensive overview of existing research articles analyzing major river basins primarily using EO. Furthermore, this review proposes to exploit EO data together with relevant open global-scale geodata to establish a database and to enable consistent spatial analyses and evaluate past and current states of major river basins.
Shisha-Tabak benötigt im Vergleich zur Zigarette höhere Konzentrationen des Feuchthaltemittels Glycerin. Seit Mai 2016 ist die bis dahin gültige Limitierung von Feuchthaltemitteln in Tabak auf 5 % aufgehoben. Derzeit ist das toxikologische Profil des Glycerins jedoch noch nicht hinreichend erforscht. Ziel dieser Arbeit war es, Glycerin auf mögliche zyto- und genotoxische
Effekte zu untersuchen, um so das Gefährdungspotenzial durch Glycerin im Shisha-Tabak zu beurteilen und die tabakkontrollpolitische Situation in Deutschland zu diskutieren.
Dafür wurden Lymphozyten sowie Nasenschleimhautzellen von 10 Patienten für eine Stunde Glycerin (0,001 mol/l bis 6,0 mol/l) exponiert. Durch den Trypanblau-Ausschlusstest wurden die Zellen auf Zytotoxizität, mittels Einzelzellgelelektrophorese (Comet Assay) und Mikrokern-Test auf Genotoxizität untersucht.
Im Trypanblau-Ausschlusstest traten bei Lymphozyten sowie nasalen Mukosazellen signifikante Vitalitätsabfälle ab Glycerin-Konzentrationen von 1,0 mol/l auf. Im Comet Assay konnten für beide Zellgruppen signifikante Unterschiede des Olive Tail Moments (OTM) ab 1,0 mol/l nachgewiesen werden. Beim Mikrokern-Test zeigten sich keine signifikanten Zunahmen der
Mikrokern-Anzahl.
Es konnten zyto- und genotoxische Effekte ab Konzentrationen von 1,0 mol/l nachgewiesen werden. Dies überschreitet die reale Glycerin-Belastung im Hauptstromrauch der Shisha jedoch deutlich. Dennoch handelt es sich bei Genotoxizität um ein stochastisches Risiko. Ebenso sind toxische Effekte, beispielsweise durch Erhitzung, bereits bei geringeren Konzentrationen denkbar. Für eine umfangreichere Beurteilung von Feuchthaltemitteln im Shisha-Tabak sind weitere Untersuchungen indiziert. Darüber hinaus besteht enormer Handlungsbedarf zur weiteren Einführung tabakkontrollpolitischer Maßnahmen in Deutschland.
Ziel der Arbeit war die Untersuchung eines möglichen Zusammenhangs zwischen Lebensqualität bzw. sozialer Unterstützung und dem Bedürfnis nach bzw. der Inanspruchnahme von psychosozialer Unterstützung bei Tumorpatienten.
Die Datenerhebung erfolgte im Rahmen einer deutschlandweiten Multicenterstudie am Studienstandort Würzburg. Eingeschlossen wurden 128 Patienten mit Melanom, gynäkologischen und gastrointestinalen Tumoren. Die Studiendaten wurden mittels Fragebögen erhoben. Hierzu zählten der SF-12-Fragebogen zur Lebensqualität, der SSUK-8-Fragebogen zur sozialen Unterstützung und jeweils ein Fragebogen zum Bedürfnis und zur Inanspruchnahme psychosozialer Unterstützung.
Ein Zusammenhang ergab sich zwischen psychischer Lebensqualität und dem Bedürfnis nach psychosozialer Unterstützung. Patienten, die ein Bedürfnis nach psychosozialer Unterstützung äußerten, wiesen eine signifikant niedrigere psychische Lebensqualität auf. Ebenso konnte ein Zusammenhang zwischen der Inanspruchnahme psychosozialer Unterstützung und der Lebensqualität gesehen werden. Patienten, die psychosoziale Unterstützungsangebote in Anspruch genommen hatten, wiesen eine niedrigere körperliche und psychische Lebensqualität auf.
Es konnten keine Zusammenhänge zwischen positiver sozialer Unterstützung und dem Bedürfnis nach bzw. der Inanspruchnahme von psychosozialer Unterstützung gesehen werden.