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Cisplatin is a commonly used chemotherapeutic agent; however, its potential side effects, including gonadotoxicity and infertility, are a critical problem. Oxidative stress has been implicated in the pathogenesis of cisplatin-induced testicular dysfunction. We investigated whether kinetin use at different concentrations could alleviate gonadal injury associated with cisplatin treatment, with an exploration of the involvement of its antioxidant capacity. Kinetin was administered in different doses of 0.25, 0.5, and 1 mg/kg, alone or along with cisplatin for 10 days. Cisplatin toxicity was induced via a single IP dose of 7 mg/kg on day four. In a dose-dependent manner, concomitant administration of kinetin with cisplatin significantly restored testicular oxidative stress parameters, corrected the distorted sperm quality parameters and histopathological changes, enhanced levels of serum testosterone and testicular StAR protein expression, as well as reduced the up-regulation of testicular TNF-α, IL-1β, Il-6, and caspase-3, caused by cisplatin. It is worth noting that the testicular protective effect of the highest kinetin dose was comparable/more potent and significantly higher than the effects of vitamin C and the lowest kinetin dose, respectively. Overall, these data indicate that kinetin may offer a promising approach for alleviating cisplatin-induced reproductive toxicity and organ damage, via ameliorating oxidative stress and reducing inflammation and apoptosis.
Readers use prior knowledge to evaluate the validity of statements and detect false information without effort and strategic control. The present study expands this research by exploring whether people also non-strategically detect information that threatens their social identity. Participants (N = 77) completed a task in which they had to respond to a “True” or “False” probe after reading true, false, identity-threatening, or non-threatening sentences. Replicating previous studies, participants reacted more slowly to a positive probe (“True”) after reading false (vs. true) sentences. Notably, participants also reacted more slowly to a positive probe after reading identity-threatening (vs. non-threatening) sentences. These results provide first evidence that identity-threatening information, just as false information, is detected at a very early stage of information processing and lends support to the notion of a routine, non-strategic identity-defense mechanism.
Objectives
Handball is associated with a high risk of overuse shoulder injury. This study investigated if an injury prevention programme effectively reduces overuse injury to the throwing shoulder of handball athletes.
Methods
61 men’s and women’s handball teams (u-19 and senior athletes) were cluster-randomised into an intervention and a control group in the 2019–2020 season. Players of the intervention group regularly carried out an injury prevention programme. Both groups documented overuse shoulder injuries via an online questionnaire every second week. The primary endpoint was the prevalence of overuse injury to the throwing shoulder. Secondary endpoints were the influence of compliance on the primary endpoint and intensity of overuse shoulder symptoms measured by a shortened, handball-specific Western Ontario Shoulder Index (WOSI).
Results
31 teams (295 players) in the intervention group and 30 teams (284 players) in the control group were included for analyses. The overall questionnaire response rate was 61%. The average prevalence of overuse shoulder injury did not significantly differ between the intervention group (n=109, 38.4% (95% CI 32.9% to 44.2%)) and the control group (n=106, 35.9% (95% CI 30.7% to 41.6%), p=0.542). Compliance with the intervention programme did not significantly affect overuse shoulder injury (p=0.893). Using generalised estimating equations for WOSI, the estimated mean for the intervention group was 44.6 points (95% CI 42.0 to 47.1) and 47.6 points for the control group (95% CI 44.9 to 50.3, p=0.111).
Conclusions
A multicomponent exercise programme using rubber bands and stretching did not significantly reduce the prevalence or symptoms of overuse throwing shoulder injury in handball athletes of both sexes. Randomised controlled study; level of evidence I.
To date, no consensus exists regarding the best surgical management of isolated, micro-traumatic long thoracic nerve (LTN) paresis. Our hypothesis was that a combined decompression of the LTN at two potential locations for entrapment would be effective in the management of dynamic LTN paresis. We report on twelve patients with isolated LTN parersis, with tenderness at two entrapment sites, who underwent bifocal LTN decompression after undergoing unsuccessful conservative treatment for at least 6 months; all patients had preoperative electrodiagnostic studies that confirmed the paresis and ruled out peripheral neuritis. Clinical and electrical improvements were observed in eight patients (67%) regarding shoulder flexion, shoulder abduction, and Quick-DASH scores. Four patients (33%) did not improve after surgery. The results corroborate our hypothesis that a bifocal LTN decompression can be an effective and reliable therapeutic option in more than half of a very selective patient population suffering from serratus anterior muscle deficiency.
We quantify the contemporaneous relationships among stock markets in the euro area, the United States, and a group of emerging economies over the period from 2008 to 2017. Exploiting the heteroskedasticity in the stock market data, we identify shocks that originated in the respective domestic markets and shocks that are common to all markets. Our results underline the leading role of the United States in international equity markets, but also point to the importance of indirect spillovers for all economies. Variance decompositions show that while domestic shocks explain the bigger part of the variation in each stock market, a substantial part of the variation in the euro area and the emerging economies can be attributed to foreign shocks. A comparison with a sample covering the pre‐crisis period from 1999 to 2007 suggests a strengthening of the linkages among global stock markets in recent years. In particular, the spillovers from advanced to emerging economies have become more pronounced.
Bei der vorliegenden Arbeit handelt es sich um eine klinische und radiologische Nachuntersuchung von insgesamt 114 Patientinnen und Patienten, die zwischen 2009 und 2012 in der Poliklinik für Zahnerhaltung und Parodontologie der Universität Würzburg von approbierten Zahnärztinnen und Zahnärzten endodontisch behandelt wurden. Dabei kamen drei verschiedene Obturationsmethoden zum Einsatz.
1. Single-Cone-Technik mit Guttapercha und AH Plus® (SCGP)
2. Single-Cone-Technik mit Guttapercha und GuttaFlow® (SCGF)
3. Adhäsive Obturation in Continuous-Wave-Technik mit Resilon® (CWR)
Die Erhebung der Ausgangsvariablen (zum Behandlungszeitpunkt) erfolgte retrospektiv unter Zuhilfenahme der klinischen und radiologischen Dokumentation. Die Reevaluation des periapikalen Zustands der Zähne und die Erhebung weiterer klinischer Parameter erfolgte im Rahmen eines aktiven Patientenrecalls nach durchschnittlich 6,3 Jahren. Dabei wurden mit möglichst hoher Standardisierung postoperative Einzelzahnaufnah-men angefertigt. Diese wurden anhand der PAI-Klassifikation ausgewertet, um den pe-riapikalen Zustand der Zähne vor und nach Therapie zu bestimmen. PAI-Werte von 1 und 2 galten als Behandlungserfolg, Grad 3 bis 5 als Misserfolg. Im Hinblick auf die de-finierten Arbeitshypothesen wurden die Erfolgsraten innerhalb der Kohorten miteinander verglichen. Das vorrangige Ziel der hier vorliegenden Arbeit war, zu untersuchen, ob der endodontische Behandlungserfolg abhängig von der jeweiligen Obturationsmethode ist und ob technikspezifische Unterschiede sich einerseits auf die Qualität der Obturation und andererseits auf das Auftreten möglicher Komplikationen, wie der periapikalen Extrusion von Wurzelfüllmaterial, auswirken. Ferner sollten diese Aspekte neben weite-ren zahn- und patientenbezogenen Variablen bezüglich ihres Einflusses auf die Erfolgs-rate der endodontischen Therapie analysiert werden.
Es konnten keine signifikanten Unterschiede der endodontischen Erfolgsraten zwischen den hier untersuchten Obturationsmethoden ermittelt werden (p = ,16). In der SCGP-Kohorte lag die Erfolgsrate bei 85 % (34/40) verglichen mit 68,8 % (44/64) für CWR und 80 % (8/10) für SCGF. Die Homogenität der Obturation (p = ,2) und die Extrusion von Wurzelfüllmaterial in das periapikale Gewebe (p = ,93) zeigten keine Abhängigkeit von der gewählten Obturationstechnik. Die Länge der Wurzelkanalfüllung hingegen unter-schied sich signifikant zwischen den Kohorten (p = ,04*). Die Obturation mittels SCGP-Technik erzielte den höchsten Anteil adäquater Wurzelkanalfüllungen (92,5 %, 37/40) gegenüber SCGF (80 %, 8/10) und CWR (71,88 %, 46/64). Die CWR-Methode zeigte mit 18,8 % (12/64) den höchsten Anteil an unterfüllten Obturationen (SCGP: 7,5 %, 3/40; SCGF: 0 %).
Unabhängig von der Obturationsmethodik zeigte sich der endodontische Behandlungs-erfolg im Allgemeinen unbeeinflusst von der Qualität der Wurzelkanalfüllungen. Die Va-riablen Obturationslänge (p = ,12) und -homogenität (p = ,11) sowie die Extrusion von Wurzelfüllmaterial in die periapikale Region (p = 1,00) zeigten keinen signifikanten Ein-fluss auf die Erfolgsrate.
Das Durchschnittsalter im Patientenkollektiv betrug 60 Jahre mit einer tendenziellen Überrepräsentation weiblicher Probandinnen (60,5 %, 69/114). 73 % (81/111, 3 Mis-sings) der Studienteilnehmer/-innen wurden ab einem PSI-Grad von 3 als parodontal erkrankt eingestuft und 23,7 % (27/114) zeigten eine positive Raucheranamnese. Der BMI betrug im Durchschnitt 26,3 kg/m2. 42,3 % (47/111, 3 Missings) der Studienteil-nehmer/-innen wurden anhand der Einnahme von Medikamenten zur Therapie bzw. Prävention von kardiovaskulären Erkrankungen und/oder oraler Antidiabetika als chro-nisch erkrankt klassifiziert (chronic disease medication, CDM). Das Recallintervall be-trug durchschnittlich 6,3 Jahre mit einem Minimum von 4,7 und einem Maximum von 8,7 Jahren. Die patientenbezogenen Variablen Alter (p = ,45), Geschlecht (p = ,67), Pa-rodontitis (p = ,08), BMI (p = ,58), CDM (p = ,19), Recallintervall (p = ,08) und Rauchen (p = ,34) zeigten keinen signifikanten Einfluss auf den endodontischen Behandlungser-folg.
Unter den zahnbezogenen Variablen beeinflusste lediglich der präoperative apikale Sta-tus den endodontischen Erfolg signifikant (p = ,007*). Zähne mit präoperativer apikaler Läsion zeigten eine Erfolgsrate von 66,2 % (47/71) gegenüber 90,7 % (n = 39/43) bei Fällen ohne apikale Läsion. Die Misserfolgswahrscheinlichkeit bei Vorliegen einer präoperativen Läsion war um den Faktor 4,98 erhöht (OR = 4,98, 95 % KI: 1.60, 15,57, p = ,006*). Zwischen Kompositfüllungen, Teilkronen, Vollkronen, Teleskopkronen und Brückenversorgungen konnten keine relevanten Unterschiede in den Erfolgsraten er-mittelt werden (p = ,29). Gleiches galt für adäquate (76,6 %, 82/107) und inadäquate (57,1 %, 4/7) Restaurationen (p = ,36). Ebenso zeigten die Erfolgsraten von Wurzelka-nalrevisionen (70,5 %, 31/44) und Primärbehandlungen (78,6 %, 55/70) keine signifikan-ten Abweichungen voneinander (p = ,45). Molaren waren im Studienkollektiv mit 56,1 % (64/114) gegenüber Prämolaren und Frontzähnen mit je 21,9 % (25/114) überrepräsen-tiert. Der Zahntyp (p = ,07) und die Ausgangsdiagnose (p = ,22) stellten keine relevanten Einflussfaktoren des endodontischen Erfolgs dar.
Die AML stellt mit einem Anteil von 80 % an den akuten Leukämien bei Erwachsenen eine bedeutende Erkrankung für die Gesellschaft dar. Aufgrund fehlender durchbrechender Erfolge in der Therapieentwicklung liegt die durchschnittliche Fünfjahresüberlebensrate dennoch nur bei etwa 25 %. Der Blick auf die Kraft des Graft-versus-Leukämie-Effekts nach allogener Stammzelltransplantation, eine Langzeitremission der AML erzielen zu können, weist jedoch auf die Immunogenität und Eignung der Erkrankung für neue immuntherapeutische Ansätze hin.
Anhand der Kartierung der in-vivo präsentierten MHC-Klasse-I-Peptidome auf
AML-Blasten sollten in dieser Arbeit potenziell geeignete Therapietargets identifiziert werden, um eine breitere Anwendung immuntherapeutischer Strategien bei AML-Patienten zu ermöglichen. Auf primären Patientenmaterialien, Zelllinien und benignen Zellen wurden hierzu über eine Immunoaffinitätschromatographie mit nachfolgenden Purifizierungsschritten
die MHC-präsentierten Peptide massenspekrometrisch-basiert
identifiziert. Zusätzlich erfolgte eine Quantifizierung der Oberflächen- und intrazellulären MHC-Klasse-I-Moleküle der verwendeten Proben durch einen indirekten Immunfluoreszenz-Assay.
Unter der Gesamtheit von 17.750 identifizierten nicht-redundanten MHC-Klasse-
I-präsentierten Peptiden konnte eine Vielzahl von 5.626 Peptiden mit Präsentationsfrequenzen bis zu 72 % als AML-exklusiv beschrieben werden. Hierunter wurden 240 kryptische Peptide vermeintlich nicht-codierenden Ursprungs identifiziert. Zudem wurden mehrere potenziell CMV-kreuzreaktive AML-Peptide erfasst, die zu der reduzierten Rezidivrate bei CMV-Infektion nach allogener Stammzelltransplantation führen könnten. Bei der MHC-Quantifizierung wiesen die AML-Blasten keine verminderte MHC-Expression auf und stellten sich somit als geeignete Target-Zellen für eine T-Zell-Immuntherapie dar.
Die nächtliche (24-stündige) Überwachung des intraokularen Drucks (IOD) bei stationären Glaukompatienten wird in Europa seit mehr als 100 Jahren eingesetzt, um Spitzenwerte zu erkennen, die während der regulären Sprechstundenzeiten übersehen werden. Daten, die diese Praxis unterstützen, fehlen, zum Teil weil es schwierig ist, manuell erstellte IOD-Kurven mit dem objektiven Verlauf des Glaukoms zu korrelieren. Um dieses Problem zu beheben, haben wir automatisierte IOD-Datenextraktionswerkzeuge eingesetzt und auf eine Korrelation mit einem fortschreitenden Verlust der retinalen Nervenfaserschicht auf der optischen Kohärenztomographie im Spektralbereich (SDOCT) getestet.
Compared to cell therapy, where cells are injected into a defect region, the treatment of heart infarction with cells seeded in a vascularized scaffold bears advantages, such as an immediate nutrient supply or a controllable and persistent localization of cells. For this purpose, decellularized native tissues are a preferable choice as they provide an in vivo-like microenvironment. However, the quality of such scaffolds strongly depends on the decellularization process. Therefore, two protocols based on sodium dodecyl sulfate or sodium deoxycholate were tailored and optimized for the decellularization of a porcine heart. The obtained scaffolds were tested for their applicability to generate vascularized cardiac patches. Decellularization with sodium dodecyl sulfate was found to be more suitable and resulted in scaffolds with a low amount of DNA, a highly preserved extracellular matrix composition, and structure shown by GAG quantification and immunohistochemistry. After seeding human endothelial cells into the vasculature, a coagulation assay demonstrated the functionality of the endothelial cells to minimize the clotting of blood. Human-induced pluripotent-stem-cell-derived cardiomyocytes in co-culture with fibroblasts and mesenchymal stem cells transferred the scaffold into a vascularized cardiac patch spontaneously contracting with a frequency of 25.61 ± 5.99 beats/min for over 16 weeks. The customized decellularization protocol based on sodium dodecyl sulfate renders a step towards a preclinical evaluation of the scaffolds.
Olea europaea L. Cv. Arbequina (OEA) (Oleaceae) is an olive variety species that has received little attention. Besides our previous work for the chemical profiling of OEA leaves using LC–HRESIMS, an additional 23 compounds are identified. An excision wound model is used to measure wound healing action. Wounds are provided with OEA (2% w/v) or MEBO\(^®\) cream (marketed treatment). The wound closure rate related to vehicle-treated wounds is significantly increased by OEA. Comparing to vehicle wound tissues, significant levels of TGF-β in OEA and MEBO\(^®\) (p < 0.05) are displayed by gene expression patterns, with the most significant levels in OEA-treated wounds. Proinflammatory TNF-α and IL-1β levels are substantially reduced in OEA-treated wounds. The capability of several lignan-related compounds to interact with MMP-1 is revealed by extensive in silico investigation of the major OEA compounds (i.e., inverse docking, molecular dynamics simulation, and ΔG calculation), and their role in the wound-healing process is also characterized. The potential of OEA as a potent MMP-1 inhibitor is shown in subsequent in vitro testing (IC\(_{50}\) = 88.0 ± 0.1 nM). In conclusion, OEA is introduced as an interesting therapeutic candidate that can effectively manage wound healing because of its anti-inflammatory and antioxidant properties.
Candida glabrata ist die zweithäufigste Ursache von Candidämien und invasiven Hefepilzinfektionen in Europa. Im Gegensatz zu C. albicans zeigt C. glabrata eine reduzierte Empfindlichkeit gegen bestimmte Antimykotika und kann unter Therapie rasch Resistenzen entwickeln.
Diese Arbeit umfasst eine systematische geno- und phänotypische Resistenzanalyse einer der größten europäischen - durch das NRZMyk in 5 Jahren zusammengetragenen - C. glabrata Stammsammlungen bestehend aus 176 klinisch relevanter Isolate. 84 der Stämme wurden anhand Referenztestung nach EUCAST zunächst als Anidulafungin (AND) resistent eingestuft. 71 wiesen konkordante Mutationen in den für die Glucan-Synthetase kodierenden FKS-Genen auf (13 % in FKS1, 87 % in FKS2). Vor allem die Position Ser-663 (FKS2-HS1) imponierte mit signifikant erhöhten AND MHK-Werten. 11 FKS-Wildtyp-Isolate, die ursprünglich als AND resistent klassifiziert wurden, wiesen in multiplen Nachtestungen um den Breakpoint undulierende AND MHK-Werte auf. 2 FKS-Wildtyp Isolate zeigten durchgängig hohe AND MHK-Werte und mussten daher - trotz fehlender Zielgenmutationen - als resistent eingestuft werden. Diese extremen Phänotypen wurden durch einen verblindeten nationalen Ringversuch bestätigt. Über ein Drittel der Isolate war multiresistent. Stämme aus Blutstrominfektionen und Ser-663 Mutation waren mit einer erhöhten Mortalität assoziiert. Ein weiteres Kernelement war die Detektion von Azol-resistenten C. glabrata petite-Phänotypen in der Routinediagnostik. Hier wurden innerhalb von 8 Monaten 20 relevante Isolate identifiziert.
Die Ergebnisse belegen das regelmäßige Auftreten single- / multidrug-resistenter C. glabrata Isolate in Deutschland. Phänotypische Resistenztestungen können zu Fehlklassifizierung von sensiblen Isolaten führen. FKS-Genotypisierungen hingegen sind ein nützliches Tool zur Identifizierung relevanter Resistenzen. In seltenen Fällen scheint jedoch eine Echinocandin-Resistenz ohne genotypisches Korrelat möglich zu sein.
Candida auris was first described as a yeast pathogen in 2009. Since then, the species has emerged worldwide. In contrast to most other Candida spp., C. auris frequently exhibits multi-drug resistance and is readily transmitted in hospital settings. While most detections so far are from colonised patients, C. auris does cause superficial and life-threatening invasive infections. During management of the first documented C. auris transmission in a German hospital, experts from the National Reference Centers for Invasive Fungal Infections (NRZMyk) and the National Reference Center for Surveillance of Nosocomial Infections screened available literature and integrated available knowledge on infection prevention and C. auris epidemiology and biology to enable optimal containment. Relevant recommendations developed during this process are summarised in this guidance document, intended to assist in management of C. auris transmission and potential outbreak situations. Rapid and effective measures to contain C. auris spread require a multi-disciplinary approach that includes clinical specialists of the affected unit, nursing staff, hospital hygiene, diagnostic microbiology, cleaning staff, hospital management and experts in diagnostic mycology / fungal infections. Action should be initiated in a step-wise process and relevant interventions differ between management of singular C. auris colonised / infected patients and detection of potential C. auris transmission or nosocomial outbreaks.
Utilizing multiple access technologies such as 5G, 4G, and Wi-Fi within a coherent framework is currently standardized by 3GPP within 5G ATSSS. Indeed, distributing packets over multiple networks can lead to increased robustness, resiliency and capacity. A key part of such a framework is the multi-access proxy, which transparently distributes packets over multiple paths. As the proxy needs to serve thousands of customers, scalability and performance are crucial for operator deployments. In this paper, we leverage recent advancements in data plane programming, implement a multi-access proxy based on the MP-DCCP tunneling approach in P4 and hardware accelerate it by deploying the pipeline on a smartNIC. This is challenging due to the complex scheduling and congestion control operations involved. We present our pipeline and data structures design for congestion control and packet scheduling state management. Initial measurements in our testbed show that packet latency is in the range of 25 μs demonstrating the feasibility of our approach.
A Case Study of the Basic Learners’ Struggles in Guessing from Context to Retain Words Learned
(2022)
Guessing meaning from context is a challenging strategy for Second Language Learners (SLLs). In using the strategy, research found that poor students or low proficiency learners struggled in their attempts to use it. Mainly, it was reported that it was due to their vocabulary knowledge was limited. In another aspect, retaining vocabulary learnt is also important. Such is essential since learning vocabulary does not mean knowing the definition only. Yet, learners must also be able to use the vocabulary as they engage in language skills such as reading, writing, speaking and listening. The study aims at finding the hindrances faced among poor students’ using contextual clues in retaining vocabulary. The study employed a case study to collect data from two basic students studying at a tertiary level. The study found that their hindrances in guessing meaning contexts were due to their being confused in guessing meaning when reading a sentence. Also, it was found that they were not able to find clues since they lacked vocabulary to guess correctly. The study implied that guessing meaning from context required sizeable vocabulary knowledge. Therefore, more training is necessary to assist basic learners in being successful in guessing from contexts.
Prediction of tinnitus perception based on daily life mHealth data using country origin and season
(2022)
Tinnitus is an auditory phantom perception without external sound stimuli. This chronic perception can severely affect quality of life. Because tinnitus symptoms are highly heterogeneous, multimodal data analyses are increasingly used to gain new insights. MHealth data sources, with their particular focus on country- and season-specific differences, can provide a promising avenue for new insights. Therefore, we examined data from the TrackYourTinnitus (TYT) mHealth platform to create symptom profiles of TYT users. We used gradient boosting engines to classify momentary tinnitus and regress tinnitus loudness, using country of origin and season as features. At the daily assessment level, tinnitus loudness can be regressed with a mean absolute error rate of 7.9% points. In turn, momentary tinnitus can be classified with an F1 score of 93.79%. Both results indicate differences in the tinnitus of TYT users with respect to season and country of origin. The significance of the features was evaluated using statistical and explainable machine learning methods. It was further shown that tinnitus varies with temperature in certain countries. The results presented show that season and country of origin appear to be valuable features when combined with longitudinal mHealth data at the level of daily assessment.
La situation au Xinjiang, région du Nord-Ouest de la Chine, a ces dernières années suscité une attention internationale croissante. Les rapports sur les internements massifs de Ouïghours et d’autres groupes ethniques dans des camps de rééducation, le travail forcé, les stérilisations forcées et autres atteintes aux droits humains font la une de l’actualité et affectent les relations entre la Chine et ceux qui la critiquent. Le gouvernement chinois, en revanche, justifie sa manière d’agir par la lutte contre le terrorisme, l’extrémisme islamique et le séparatisme ethnique. << Le Xinjiang – la Chine et les Ouïghours >> présente pour la première fois en français une analyse scientifique plus approfondie de ce sujet très controversé. La première partie du livre constitue une introduction prégnante, claire et vivante de l’histoire complexe de la région. La deuxième partie présente l’évolution au XXIe siècle, dressant un tableau à multiples facettes du développement économique, de l’identité ethnique et de la politique linguistique et religieuse. La troisième partie remet en question les interprétations courantes du conflit au Xinjiang, analyse les protestations et les actes de terrorisme de même que les mesures de répression de l’État et la dimension internationale du conflit. Proche des sources, basé sur les résultats de la recherche la plus récente et avec un souci constant de neutralité, << Le Xinjiang – la Chine et les Ouïghours >> offre une image équilibrée des conflits actuels.
The interaction between circadian clocks and metabolism is of increasing interest, since clock dysfunction often correlates with metabolic pathologies. Many research articles have been published analysing the impact of factors such as circadian clock, light, feeding time and diet-type on energy homeostasis in various tissues/organs of organisms with most of the findings done in mammals. Little is known about the impact of circadian clock and the above-mentioned factors on circulating lipids, especially the transport form of lipids - diacylglycerol (DG) and membrane lipids such as phosphatidylethanolamine (PE) and phosphatidylcholine (PC) in the Drosophila hemolymph. The fruit fly Drosophila is a prime model organism in circadian, behaviour and metabolism research.
To study the role of circadian clock and behaviour in metabolism, we performed an extensive comparative hemolymph lipid (diacylglycerol: DG, phosphatidylethanolamine: PE, phosphatidylcholine: PC) analysis using ultra performance liquid chromatography coupled to time-of-flight mass spectrometry (UPLC-MS) between wild-type flies (WTCS) and clock disrupted mutants (per01). In addition, clock controlled food intake– feeding behaviour was investigated. Time-dependent variation of transport (DG) and membrane lipids (PE and PC) were not rhythmic in WTCS under constant darkness and in per01 under LD, suggesting an impact of light and clock genes on daily lipid oscillations. Day-time and night-time restriction of food led to comparable lipid profiles, suggesting that lipid oscillations are not exclusively entrained by feeding but rather are endogenously regulated. Ultradian oscillations in lipid levels in WTCS under LD were masked by digested fatty acids since lipid levels peaked more robustly at the beginning and end of light phase when flies were fed a lipid- and protein-free diet. These results suggest that metabolite (DG, PE and PC) oscillation is influenced by complex interactions between nutrient-type, photic conditions, circadian clock and feeding time.
In conclusion, the results of this thesis suggest that circadian clocks determine transport and membrane lipid oscillation in Drosophila hemolymph in complex interactions between nutrient-type, photic conditions and feeding behaviour.
Central European forests experience a substantial loss of open-forest organisms due to forest management and increasing nitrogen deposition. However, management strategies, removing different levels of nitrogen, have been rarely evaluated simultaneously.
We tested the additive effects of coppicing and topsoil removal on communities of dung-inhabiting beetles compared to closed forests. We sampled 57 021 beetles, using baited pitfall traps exposed on 27 plots.
Experimental treatments resulted in significantly different communities by promoting open-habitat species. While alpha diversity did not differ among treatments, gamma diversity of Geotrupidae and Scarabaeidae and beta diversity of Staphylinidae were higher in coppice than in forest. Functional diversity of rove beetles was higher in both, coppice and topsoil-removed plots, compared to control plots. This was likely driven by higher habitat heterogeneity in established forest openings. Five dung beetle species and four rove beetle species benefitted from coppicing, one red-listed dung beetle and two rove beetle species benefitted from topsoil removal.
Our results demonstrate that dung-inhabiting beetles related to open forest patches can be promoted by both, coppicing and additional topsoil removal. A mosaic of coppice and bare-soil-rich patches can hence promote landscape-level gamma diversity of dung and rove beetles within forests.
Im Zellkern eukaryotischer Zellen werden Gene in mRNAs transkribiert, welche umfangreich prozessiert und aus dem Zellkern exportiert werden. Im Zytoplasma erfolgt die Translation der mRNAs in Proteine, ein Prozess, welcher viel Energie benötigt und daher mittels vielfältiger Mechanismen streng reguliert wird. Ein Beispiel hierfür stellt die Klasse der TOP-mRNAs dar, eine RNA-Spezies, welche hauptsächlich Transkripte von Genen umfasst, die selbst in die Translation involviert sind. Die prominentesten Vertreter dieser Klasse sind die Proteine der kleinen und großen ribosomalen Untereinheiten. TOP-mRNAs zeichnen sich durch ein gemeinsames Sequenz-Motiv am Anfang Ihrer 5’-UTR aus, welches aus einem Pyrimidinstrang besteht und unmittelbar nach dem Cap mit einem Cytosin beginnt. Dieses allen TOP-RNAs gemeinsame Motiv ermöglicht die zeitgleiche Translationskontrolle dieser RNA-Klasse. So kann die Translation der TOP-mRNAs unter Stressbedingungen wie z.B. Nährstoffmangel koordiniert inhibiert werden, wodurch Energie eingespart wird.
Bereits lange wird nach einem Regulator gesucht, der an dieses TOP-Motiv bindet und die koordinierte Regulation ermöglicht. Man kann sich hier einen Inhibitor oder auch einen Aktivator vorstellen. Verschiedene Proteine wurden bereits in Erwägung gezogen. In dieser Arbeit wurde das Protein TIAR mittels Massenspektrometrie als TOP-interagierender Faktor identifiziert und dessen Bindungseigenschaften mit dem TOP-Motiv durch Shift Assays untersucht. Hierbei konnten Minimalkonstrukte verschiedener Organismen sowie RNA-TOP – Sequenzen identifiziert werden, welche sich für Strukturanalysen eignen würden. Als weiterer TOP-interagierender Faktor wurde über verschiedene sequenzielle Reinigungsschritte das Protein 14-3-3ε identifiziert.
Weiterhin wurden die TOP-Motiv-bindenden Proteine LARP1 und LARP7 auf Ihre Bindungseigenschaften mit Ihren Zielsequenzen untersucht. Während gezeigt werden konnte, dass LARP1 einen inhibierenden Einfluss auf TOP-RNAs hat, wurde in weiteren Shift-Assays die Bindungseigenschaften von LARP7 mit 7SK untersucht, wobei ebenfalls ein minimales LARP7–Konstrukt sowie 7SK-Konstrukte für Strukturanalysen identifiziert werden konnten. Weiterhin konnte gezeigt werden, dass verschiedene Substanzen wie tRNA und Arginin einen starken Einfluss auf die LARP7-7SK – Interaktion ausüben, welcher in weiteren Studien berücksichtigt werden sollte.
Animal models are important tools to investigate the pathogenesis and develop treatment strategies for breast cancer in humans. In this study, we developed a new three-dimensional in vivo arteriovenous loop model of human breast cancer with the aid of biodegradable materials, including fibrin, alginate, and polycaprolactone. We examined the in vivo effects of various matrices on the growth of breast cancer cells by imaging and immunohistochemistry evaluation. Our findings clearly demonstrate that vascularized breast cancer microtissues could be engineered and recapitulate the in vivo situation and tumor-stromal interaction within an isolated environment in an in vivo organism. Alginate–fibrin hybrid matrices were considered as a highly powerful material for breast tumor engineering based on its stability and biocompatibility. We propose that the novel tumor model may not only serve as an invaluable platform for analyzing and understanding the molecular mechanisms and pattern of oncologic diseases, but also be tailored for individual therapy via transplantation of breast cancer patient-derived tumors.
Background
Pancreatic adenocarcinoma (PDAC) patients with preoperative carbohydrate antigen 19-9 (CA19-9) serum levels higher than 500 U/ml are classified as biologically borderline resectable (BR-B). To date, the impact of cholestasis on preoperative CA19-9 serum levels in these patients has remained unquantified.
Methods
Data on 3079 oncologic pancreatic resections due to PDAC that were prospectively acquired by the German Study, Documentation and Quality (StuDoQ) registry were analyzed in relation to preoperative CA19-9 and bilirubin serum values. Preoperative CA19-9 values were adjusted according to the results of a multivariable linear regression analysis of pathologic parameters, bilirubin, and CA19-9 values.
Results
Of 1703 PDAC patients with tumor located in the pancreatic head, 420 (24.5 %) presented with a preoperative CA19-9 level higher than 500 U/ml. Although receiver operating characteristics (ROC) analysis failed to determine exact CA19-9 cut-off values for prognostic indicators (R and N status), the T, N, and G status; the UICC stage; and the number of simultaneous vein resections increased with the level of preoperative CA19-9, independently of concurrent cholestasis. After adjustment of preoperative CA19-9 values, 18.5 % of patients initially staged as BR-B showed CA19-9 values below 500 U/ml. However, the postoperative pathologic results for these patients did not change compared with the patients who had CA19-9 levels higher than 500 U/ml after bilirubin adjustment.
Conclusions
In this multicenter dataset of PDAC patients, elevation of preoperative CA19-9 correlated with well-defined prognostic pathologic parameters. Bilirubin adjustment of CA19-9 is feasible but does not affect the prognostic value of CA19-9 in jaundiced patients.
In der vorliegenden prospektiven Pilotstudie wurden die Hypothesen überprüft, dass es durch die nicht-invasive aurikuläre Vagusnervstimulation, jedoch nicht durch eine Kontrollstimulation am Ohrläppchen, zu einer Steigerung der Befindlichkeit, einer Verbesserung der Kognition und einem positiven Effekt auf die Herzratenvariabilität kommt.
Zusammenfassend konnten dabei in dieser Studie geringe Effekte der t-VNS auf einen kognitiven Parameter (F%-Wert des d2-Tests) sowie einen einzelnen HRV-Parameter (pNN50) gezeigt werden, wobei es Hinweise auf eine Intensitätsabhängigkeit der einzelnen Effekte gab. Auf die übrigen erfassten kognitiven Parameter und die weiteren gemessenen HRV-Parameter sowie die Befindlichkeit konnte kein Einfluss der t-VNS nachgewiesen werden. Bestätigt werden konnte das gute Sicherheitsprofil und die gute Tolerabilität der t-VNS.
The Niger Delta belongs to the largest swamp and mangrove forests in the world hosting many endemic and endangered species. Therefore, its conservation should be of highest priority. However, the Niger Delta is confronted with overexploitation, deforestation and pollution to a large extent. In particular, oil spills threaten the biodiversity, ecosystem services, and local people. Remote sensing can support the detection of spills and their potential impact when accessibility on site is difficult. We tested different vegetation indices to assess the impact of oil spills on the land cover as well as to detect accumulations (hotspots) of oil spills. We further identified which species, land cover types, and protected areas could be threatened in the Niger Delta due to oil spills. The results showed that the Enhanced Vegetation Index, the Normalized Difference Vegetation Index, and the Soil Adjusted Vegetation Index were more sensitive to the effects of oil spills on different vegetation cover than other tested vegetation indices. Forest cover was the most affected land-cover type and oil spills also occurred in protected areas. Threatened species are inhabiting the Niger Delta Swamp Forest and the Central African Mangroves that were mainly affected by oil spills and, therefore, strong conservation measures are needed even though security issues hamper the monitoring and control.
Understanding the causal relationship between genotype and phenotype is a major objective in biology. The main interest is in understanding trait architecture and identifying loci contributing to the respective traits. Genome-wide association mapping (GWAS) is one tool to elucidate these relationships and has been successfully used in many different species. However, most studies concentrate on marginal marker effects and ignore epistatic and gene-environment interactions. These interactions are problematic to account for, but are likely to make major contributions to many phenotypes that are not regulated by independent genetic effects, but by more sophisticated gene-regulatory networks. Further complication arises from the fact that these networks vary in different natural accessions. However, understanding the differences of gene regulatory networks and gene-gene interactions is crucial to conceive trait architecture and predict phenotypes.
The basic subject of this study – using data from the Arabidopsis 1001 Genomes Project – is the analysis of pre-mature stop codons. These have been incurred in nearly one-third of the ~ 30k genes. A gene-gene interaction network of the co-occurrence of stop codons has been built and the over and under representation of different pairs has been statistically analyzed. To further classify the significant over and under- represented gene-gene interactions in terms of molecular function of the encoded proteins, gene ontology terms (GO-SLIM) have been applied. Furthermore, co- expression analysis specifies gene clusters that co-occur over different genetic and phenotypic backgrounds. To link these patterns to evolutionary constrains, spatial location of the respective alleles have been analyzed as well. The latter shows clear patterns for certain gene pairs that indicate differential selection.
Die Covid-19-Pandemie gilt in vielen gesellschaftlichen Teilbereichen als Beschleuniger für Transformationsprozesse. Auch im Bereich der Organisation urbaner Logistik und Einzelhandelslandschaften etablieren sich neue Akteur*innen und Funktionen. Logistiker*innen integrieren lokale Onlinemarktplätze in ihre Profile und der stationäre Einzelhandel generiert Wettbewerbsfähigkeit gegenüber großen Onlinehändler*innen über die Nutzung lokaler Radlogistiknetzwerke, mittels derer Lieferungen noch am Tag der Bestellung (Same-Day-Delivery) verteilt werden können. Damit leisten die involvierten Akteur*innen potenziell auch einen Beitrag zur Nachhaltigkeitstransformation im Bereich urbaner Logistiksysteme. Im Fokus steht das Fallbeispiel WüLivery, ein Kooperationsprojekt des Stadtmarketingvereins, der Wirtschaftsförderung, Radlogistiker*innen sowie Einzelhändler*innen in Würzburg, welches während des zweiten coronabedingten Lockdowns im November 2020 umgesetzt wurde. Die entstehenden Dynamiken und Organisationsformen werden auf Basis von 11 Expert*inneninterviews dargestellt und analysiert. Es kann gezeigt werden, dass städtische Akteur*innen grundlegende Mediator*innen für Transformationsprozesse darstellen und Einzelhändler*innen und lokale Onlinemarktplätze als Katalysator*innen fungieren können. Das ist auch vor dem Hintergrund planerischer und politischer Kommunikationsprozesse zur Legitimation neuer Verkehrsinfrastrukturen nutzbar, da die einzelnen Akteur*innengruppen in Austausch kommen und ein gesteigertes Bewusstsein für die jeweiligen Bedarfe entsteht.
We give a collection of 16 examples which show that compositions \(g\) \(\circ\) \(f\) of well-behaved functions \(f\) and \(g\) can be badly behaved. Remarkably, in 10 of the 16 examples it suffices to take as outer function \(g\) simply a power-type or characteristic function. Such a collection of examples may serve as a source of exercises for a calculus course.
Diabetes Mellitus Is a Possible Risk Factor for Nodo-paranodopathy With Antiparanodal Autoantibodies
(2022)
Background and Objectives
Nodo-paranodopathies are peripheral neuropathies with dysfunction of the node of Ranvier. Affected patients who are seropositive for antibodies against adhesion molecules like contactin-1 and neurofascin show distinct clinical features and a disruption of the paranodal complex. An axoglial dysjunction is also a characteristic finding of diabetic neuropathy. Here, we aim to investigate a possible association of antibody-mediated nodo-paranodopathy and diabetes mellitus (DM).
Methods
We retrospectively analyzed clinical data of 227 patients with chronic inflammatory demyelinating polyradiculoneuropathy and Guillain-Barré syndrome from multiple centers in Germany who had undergone diagnostic testing for antiparanodal antibodies targeting neurofascin-155, pan-neurofascin, contactin-1–associated protein 1, and contactin-1. To study possible direct pathogenic effects of antiparanodal antibodies, we performed immunofluorescence binding assays on human pancreatic tissue sections.
Results The frequency of DM was 33.3% in seropositive patients and thus higher compared with seronegative patients (14.1%, OR = 3.04, 95% CI = 1.31–6.80). The relative risk of DM in seropositive patients was 3.4-fold higher compared with the general German population. Seropositive patients with DM most frequently harbored anti–contactin-1 antibodies and had higher antibody titers than seropositive patients without DM. The diagnosis of DM preceded the onset of neuropathy in seropositive patients. No immunoreactivity of antiparanodal antibodies against pancreatic tissue was detected.
Discussion
We report an association of nodo-paranodopathy and DM. Our results suggest that DM may be a potential risk factor for predisposing to developing nodo-paranodopathy and argue against DM being induced by the autoantibodies. Our findings set the basis for further research investigating underlying immunopathogenetic connections.
Nationwide and consistent information on agricultural land use forms an important basis for sustainable land management maintaining food security, (agro)biodiversity, and soil fertility, especially as German agriculture has shown high vulnerability to climate change. Sentinel-1 and Sentinel-2 satellite data of the Copernicus program offer time series with temporal, spatial, radiometric, and spectral characteristics that have great potential for mapping and monitoring agricultural crops. This paper presents an approach which synergistically uses these multispectral and Synthetic Aperture Radar (SAR) time series for the classification of 17 crop classes at 10 m spatial resolution for Germany in the year 2018. Input data for the Random Forest (RF) classification are monthly statistics of Sentinel-1 and Sentinel-2 time series. This approach reduces the amount of input data and pre-processing steps while retaining phenological information, which is crucial for crop type discrimination. For training and validation, Land Parcel Identification System (LPIS) data were available covering 15 of the 16 German Federal States. An overall map accuracy of 75.5% was achieved, with class-specific F1-scores above 80% for winter wheat, maize, sugar beet, and rapeseed. By combining optical and SAR data, overall accuracies could be increased by 6% and 9%, respectively, compared to single sensor approaches. While no increase in overall accuracy could be achieved by stratifying the classification in natural landscape regions, the class-wise accuracies for all but the cereal classes could be improved, on average, by 7%. In comparison to census data, the crop areas could be approximated well with, on average, only 1% of deviation in class-specific acreages. Using this streamlined approach, similar accuracies for the most widespread crop types as well as for smaller permanent crop classes were reached as in other Germany-wide crop type studies, indicating its potential for repeated nationwide crop type mapping.
There is no approved drug for fibromyalgia syndrome (FMS) in Europe. In the German S3 guideline, amitriptyline, duloxetine, and pregabalin are recommended for temporary use. The aim of this study was to cross-sectionally investigate the current practice of medication in FMS patients in Germany. We systematically interviewed 156 patients with FMS, while they were participating in a larger study. The patients had been stratified into subgroups with and without a decrease in intraepidermal nerve fiber density. The drugs most commonly used to treat FMS pain were nonsteroidal anti-inflammatory drugs (NSAIDs) (41.0% of all patients), metamizole (22.4%), and amitriptyline (12.8%). The most frequent analgesic treatment regimen was “on demand” (53.9%), during pain attacks, while 35.1% of the drugs were administered daily and the remaining in other regimens. Median pain relief as self-rated by the patients on a numerical rating scale (0–10) was 2 points for NSAIDS, 2 for metamizole, and 1 for amitriptyline. Drugs that were discontinued due to lack of efficacy rather than side effects were acetaminophen, flupirtine, and selective serotonin reuptake inhibitors. Reduction in pain severity was best achieved by NSAIDs and metamizole. Our hypothesis that a decrease in intraepidermal nerve fiber density might represent a neuropathic subtype of FMS, which would be associated with better effectiveness of drugs targeting neuropathic pain, could not be confirmed in this cohort. Many FMS patients take “on-demand” medication that is not in line with current guidelines. More randomized clinical trials are needed to assess drug effects in FMS subgroups.
CNS imaging characteristics in fibromyalgia patients with and without peripheral nerve involvement
(2022)
We tested the hypothesis that reduced skin innervation in fibromyalgia syndrome is associated with specific CNS changes. This prospective case–control study included 43 women diagnosed with fibromyalgia syndrome and 40 healthy controls. We further compared the fibromyalgia subgroups with reduced (n = 21) and normal (n = 22) skin innervation. Brains were analysed for cortical volume, for white matter integrity, and for functional connectivity. Compared to controls, cortical thickness was decreased in regions of the frontal, temporal and parietal cortex in the fibromyalgia group as a whole, and decreased in the bilateral pericalcarine cortices in the fibromyalgia subgroup with reduced skin innervation. Diffusion tensor imaging revealed a significant increase in fractional anisotropy in the corona radiata, the corpus callosum, cingulum and fornix in patients with fibromyalgia compared to healthy controls and decreased FA in parts of the internal capsule and thalamic radiation in the subgroup with reduced skin innervation. Using resting-state fMRI, the fibromyalgia group as a whole showed functional hypoconnectivity between the right midfrontal gyrus and the posterior cerebellum and the right crus cerebellum, respectively. The subgroup with reduced skin innervation showed hyperconnectivity between the inferior frontal gyrus, the angular gyrus and the posterior parietal gyrus. Our results suggest that the subgroup of fibromyalgia patients with pronounced pathology in the peripheral nervous system shows alterations in morphology, structural and functional connectivity also at the level of the encephalon. We propose considering these subgroups when conducting clinical trials.
Background:
Methylphenidate (MPH) is the first-line pharmacological treatment of attention-deficit/hyperactivity disorder (ADHD). MPH binds to the dopamine (DA) transporter (DAT), which has high density in the striatum. Assessments of the striatal dopamine transporter by single positron emission computed tomography (SPECT) in childhood and adolescent patients are rare but can provide insight on how the effects of MPH affect DAT availability. The aim of our within-subject study was to investigate the effect of MPH on DAT availability and how responsivity to MPH in DAT availability is linked to clinical symptoms and cognitive functioning.
Methods
Thirteen adolescent male patients (9–16 years) with a diagnosis of ADHD according to the DSM-IV and long-term stimulant medication (for at least 6 months) with MPH were assessed twice within 7 days using SPECT after application of I-123-β-CIT to examine DAT binding potential (DAT BP). SPECT measures took place in an on- and off-MPH status balanced for order across participants. A virtual reality continuous performance test was performed at each time point. Further clinical symptoms were assessed for baseline off-MPH.
Results
On-MPH status was associated with a highly significant change (−29.9%) of striatal DAT BP as compared to off-MPH (t = −4.12, p = 0.002). A more pronounced change in striatal DAT BP was associated with higher off-MPH attentional and externalizing symptom ratings (Pearson r = 0.68, p = 0.01). Striatal DAT BP off-MPH, but not on-MPH, was associated with higher symptom ratings (Pearson r = 0.56, p = 0.04).
Conclusion
Our findings corroborate previous reports from mainly adult samples that MPH changes striatal DAT BP availability and suggest higher off-MPH DAT BP, likely reflecting low baseline DA levels, as a marker of symptom severity.
Background
Children with different underlying malignant diseases require long-term central venous access. As for port systems in a pectoral position, peripherally implanted port systems in the forearm revealed high levels of technical and clinical success in adult cohorts.
Objective
To investigate the technical and clinical outcomes of percutaneous central venous port implantation in the forearm in adolescents.
Materials and methods
Between April 2010 and August 2020, 32 children ages 9 to 17 years with underlying malignancy received 35 totally implantable venous access ports (TIVAPs) in the forearm. All venous port systems were peripherally inserted under ultrasound guidance. Correct catheter placement was controlled by fluoroscopy. As primary endpoints, the technical success, rate of complications and catheter maintenance were analyzed. Secondary endpoints were the side of implantation, vein of catheter access, laboratory results on the day of the procedure, procedural radiation exposure, amount of contrast agent and reasons for port device removal.
Results
Percutaneous TIVAP placement under sonographic guidance was technically successful in 34 of 35 procedures (97.1%). Procedure-related complications did not occur. During the follow-up, 13,684 catheter days were analyzed, revealing 11 complications (0.8 per 1,000 catheter-duration days), Of these 11 complications, 7 were major and 10 occurred late. In seven cases, the port device had to be removed; removal-related complications did not occur.
Conclusion
Peripheral TIVAP placement in the forearms of children is a feasible, effective and safe technique with good midterm outcome. As results are comparable with standard access routes, this technique may be offered as an alternative when intermittent venous access is required.
Purpose
To evaluate the technical and clinical outcome of Sinus-XL stent placement in patients with malignant obstruction syndrome of the inferior vena cava.
Methods
Between October 2010 and January 2021, 21 patients with different malignant primary disease causing inferior vena cava obstruction were treated with Sinus-XL stent implantation. Procedural data, technical and clinical outcome parameters were retrospectively analyzed.
Results
Technical success was 100%. Analysis of available manometry data revealed a significant reduction of the mean translesional pressure gradient following the procedure (p = 0.008). Reintervention rate was 4.8% (1/21). The available follow-up imaging studies showed primary and primary-assisted stent patency rates of 93% (13/14) and 100% (14/14), respectively. Major complications did not occur. The clinical success regarding lower extremity edema was 82.4% (14/17) for the first and 85.7% (18/21) for the last follow-up. Longer lengths of IVC obstruction were associated with reduced clinical improvement after the procedure (p = 0.025). Improvement of intraprocedural manometry results and lower extremity edema revealed only minor correlation. Ascites and anasarca were not significantly positively affected by the procedure.
Conclusion
Sinus-XL stent placement in patients with malignant inferior vena cava obstruction showed high technical success and low complication rates. Regarding the clinical outcome, significant symptom improvement could be achieved in lower extremity edema, whereas ascites and anasarca lacked satisfying symptom relief. Based on our results, this procedure should be considered as a suitable therapy in a palliative care setting for patients with advanced malignant disease.
Background
To analyze the benefit of color-coded summation images in the assessment of target lumen perfusion in patients with aortic dissection and malperfusion syndrome before and after fluoroscopy-guided aortic fenestration.
Methods
Between December 2011 and April 2020 25 patients with Stanford type A (n = 13) or type B dissection (n = 12) and malperfusion syndromes were treated with fluoroscopy-guided fenestration of the dissection flap using a re-entry catheter. The procedure was technically successful in 100% of the cases and included additional iliofemoral stent implantation in four patients. Intraprocedural systolic blood pressure measurements for gradient evaluation were performed in 19 cases. Post-processed color-coded DSA images were obtained from all DSA series before and following fenestration. Differences in time to peak (dTTP) values in the compromised aortic lumen and transluminal systolic blood pressure gradients were analyzed retrospectively. Correlation analysis between dTTP and changes in blood pressure gradients was performed.
Results
Mean TTP prior to dissection flap fenestration was 6.85 ± 1.35 s. After fenestration, mean TTP decreased significantly to 4.96 ± 0.94 s (p < 0.001). Available systolic blood pressure gradients between the true and the false lumen were reduced by a median of 4.0 mmHg following fenestration (p = 0.031), with significant reductions in Stanford type B dissections (p = 0.013) and minor reductions in type A dissections (p = 0.530). A moderate correlation with no statistical significance was found between dTTP and the difference in systolic blood pressure (r = 0.226; p = 0.351).
Conclusions
Hemodynamic parameters obtained from color-coded DSA confirmed a significant reduction of TTP values in the aortic target lumen in terms of an improved perfusion in the compromised aortic region. Color-coded DSA might thus be a suitable complementary tool in the assessment of complex vascular patterns prevailing in aortic dissections, especially when blood pressure measurements are not conclusive or feasible.
The Amduat is one of the most important Netherworld Books which was recorded in various kinds of Ancient Egyptian sources since the beginning of the 18th dynasty, especially the walls of the royal tombs. The main theme of the Amduat is the journey of the sun god through the underworld where the solar bark and its crew is the central scene of the journey. The study focuses on finding the reasons of choosing the crew’s members who manage the sun bark’s journey in the Amduat. It also aims at illustrating the functions and responsibilities of each crew member. Following a historical approach, the study analyzes the Pyramid Texts and Coffin Texts as the most important documents before the New Kingdom, and proceeding to the inscriptions and writings of the monuments which contain portrayals and inscriptions of the Amduat in the New Kingdom. Furthermore, it sheds some light on the solar cycle’s main features and primary aspects, and tries to scrutinize the date, meaning, and symbolisms of the Amduat and its indications in the earlier sources.
High rates of land conversion due to urbanization are causing fragmented and dispersed spatial patterns in the wildland-urban interface (WUI) worldwide. The occurrence of anthropogenic fires in the WUI represents an important environmental and social issue, threatening not only vegetated areas but also periurban inhabitants, as is the case in many Latin American cities. However, research has not focused on the dynamics of the local climate in the WUI. This study analyzes whether wildfires contribute to the increase in land surface temperature (LST) in the WUI of the metropolitan area of the city of Guanajuato (MACG), a semi-arid Mexican city. We estimated the pre- and post-fire LST for 2018–2021. Spatial clusters of high LST were detected using hot spot analysis and examined using ANOVA and Tukey’s post-hoc statistical tests to assess whether LST is related to the spatial distribution of wildfires during our study period. Our results indicate that the areas where the wildfires occurred, and their surroundings, show higher LST. This has negative implications for the local ecosystem and human population, which lacks adequate infrastructure and services to cope with the effects of rising temperatures. This is the first study assessing the increase in LST caused by wildfires in a WUI zone in Mexico.
Nucleic acid motifs consist of conserved and variable nucleotide regions. For functional action, several motifs are combined to modules. The tool AIModules allows identification of such motifs including combinations of them and conservation in several nucleic acid stretches. AIModules recognizes conserved motifs and combinations of motifs (modules) allowing a number of interesting biological applications such as analysis of promoter and transcription factor binding sites (TFBS), identification of conserved modules shared between several gene families, e.g. promoter regions, but also analysis of shared and conserved other DNA motifs such as enhancers and silencers, in mRNA (motifs or regulatory elements e.g. for polyadenylation) and lncRNAs. The tool AIModules presented here is an integrated solution for motif analysis, offered as a Web service as well as downloadable software. Several nucleotide sequences are queried for TFBSs using predefined matrices from the JASPAR DB or by using one’s own matrices for diverse types of DNA or RNA motif discovery. Furthermore, AIModules can find TFBSs common to two or more sequences. Demanding high or low conservation, AIModules outperforms other solutions in speed and finds more modules (specific combinations of TFBS) than alternative available software. The application also searches RNA motifs such as polyadenylation site or RNA–protein binding motifs as well as DNA motifs such as enhancers as well as user-specified motif combinations (https://bioinfo-wuerz.de/aimodules/; alternative entry pages: https://aimodules.heinzelab.de or https://www.biozentrum.uni-wuerzburg.de/bioinfo/computing/aimodules). The application is free and open source whether used online, on-site, or locally.
A modular synthesis of both difurooxa‐ and difuroazadiborepins from a common precursor is demonstrated. Starting from 2,2′‐bifuran, after protection of the positions 5 and 5’ with bulky silyl groups, formation of the novel polycycles proceeds through opening of the furan rings to a dialkyne and subsequent re‐cyclization in the borylation step. The resulting bifuran‐fused diborepins show pronounced stability, highly planar tricyclic structures, and intense blue light emission. Deprotection and transformation into dibrominated building blocks that can be incorporated into π‐extended materials can be performed in one step. Detailed DFT calculations provide information about the aromaticity of the constituent rings of this polycycle.
Im Zeitraum vom 30.01.2019 bis zum 26.05.2020 wurden aus dem Universitätsklinikum Würzburg alle Patienten, die sowohl eine Charmi-Erstellung als auch eine Anlage des ASD-Dokuments erhalten haben, in das zu untersuchende Patientenkollektiv aufgenommen. Von diesen, so ermittelten, 1458 Patienten werden die stattgefundenen Operationen der Patienten eruiert. Die Bewegungswerte werden mithilfe des hierarchisch angeordneten Charmi-Systems von 0 bis 10 von den Physiotherapeuten erhoben. Dabei stellt der Charité Mobilitätsindex (Charmi-Index) ein neuartiges Diagnostikum dar, welches als Bewertungssystem zu Beginn 2019 erstmalig von den Physiotherapeuten an der Universität Würzburg eingesetzt wurde.
Der Schmerzzustand und Schmerzverlauf wird im Rahmen der Schmerzvisiten durch den Akutschmerzdienst (ASD) mithilfe der NRS-Skala festgehalten. Auch die NRS-Skala stellt eine hierarchisch aufgebaute Skala von 0 bis 10 dar. Schmerzwerte werden täglich im Verlauf der postoperativen Visiten erhoben. Charmi-Werte werden zu Beginn der postoperativen Phase, bei Zwischenereignissen und am Ende des stationären Aufenthalts oder bei Verlegung in einen anderen Fachbereich erhoben. Bei zeitgleich erhobenen Charmi-Werten und Schmerzwerten können diese zueinander in Bezug gesetzt werden.
Dabei kommt heraus, dass das Schmerzniveau in Ruhe und bei Belastung in der frühen postoperativen Phase negativ mit der Mobilität assoziiert ist. Zusätzlich zeigt sich, dass bei zunehmender Medikamentendosis die Mobilität sinkt. Je größer die Schmerzen der Patienten sind, desto schlechter die Mobilität. Wegen fehlender Charmi-Zwischenbefunde und zeitlich versetzt erhobener Charmi-Endbefunde ist kaum ein Zusammenhang zur Mobilität ersichtlich. Bei zeitlich passenden Charmi-Endwerten zeigt sich dennoch, dass bei steigenden Belastungsschmerzen die Mobilität abnimmt.
Eine weitere Erkenntnis ist, dass der Belastungsschmerz bei niedrigen Schmerzwerten durchschnittlich um 1,5-1,6 höher ist als der Ruheschmerz, bei mittleren Schmerzwerten um 1,5-1,4 höher und bei hohen Schmerzwerten um 1,4-1,2 höher.
Bei steigendem Ruheschmerz wird von den Patienten mehr Medikament angefordert als bei steigendem Belastungsschmerz, was die Vermutung zulässt, dass Patienten eher auf die Bewegung verzichten. Ein Therapieregime vermehrt mit Blickrichtung auf den Belastungsschmerz scheint daher an Bedeutung zuzunehmen.
Background
Regulatory CD4\(^+\)CD25\(^+\)FoxP3\(^+\) T cells (Treg) are a subgroup of T lymphocytes involved in maintaining immune balance. Disturbance of Treg number and impaired suppressive function of Treg correlate with Parkinson’s disease severity. Superagonistic anti-CD28 monoclonal antibodies (CD28SA) activate Treg and cause their expansion to create an anti-inflammatory environment.
Methods
Using the AAV1/2-A53T-α-synuclein Parkinson’s disease mouse model that overexpresses the pathogenic human A53T-α-synuclein (hαSyn) variant in dopaminergic neurons of the substantia nigra, we assessed the neuroprotective and disease-modifying efficacy of a single intraperitoneal dose of CD28SA given at an early disease stage.
Results
CD28SA led to Treg expansion 3 days after delivery in hαSyn Parkinson’s disease mice. At this timepoint, an early pro-inflammation was observed in vehicle-treated hαSyn Parkinson’s disease mice with elevated percentages of CD8\(^+\)CD69\(^+\) T cells in brain and increased levels of interleukin-2 (IL-2) in the cervical lymph nodes and spleen. These immune responses were suppressed in CD28SA-treated hαSyn Parkinson’s disease mice. Early treatment with CD28SA attenuated dopaminergic neurodegeneration in the SN of hαSyn Parkinson’s disease mice accompanied with reduced brain numbers of activated CD4\(^+\), CD8\(^+\) T cells and CD11b\(^+\) microglia observed at the late disease-stage 10 weeks after AAV injection. In contrast, a later treatment 4 weeks after AAV delivery failed to reduce dopaminergic neurodegeneration.
Conclusions
Our data indicate that immune modulation by Treg expansion at a timepoint of overt inflammation is effective for treatment of hαSyn Parkinson’s disease mice and suggest that the concept of early immune therapy could pose a disease-modifying option for Parkinson’s disease patients.
Quantifying tree defoliation by insects over large areas is a major challenge in forest management, but it is essential in ecosystem assessments of disturbance and resistance against herbivory. However, the trajectory from leaf-flush to insect defoliation to refoliation in broadleaf trees is highly variable. Its tracking requires high temporal- and spatial-resolution data, particularly in fragmented forests.
In a unique replicated field experiment manipulating gypsy moth Lymantria dispar densities in mixed-oak forests, we examined the utility of publicly accessible satellite-borne radar (Sentinel-1) to track the fine-scale temporal trajectory of defoliation. The ratio of backscatter intensity between two polarizations from radar data of the growing season constituted a canopy development index (CDI) and a normalized CDI (NCDI), which were validated by optical (Sentinel-2) and terrestrial laser scanning (TLS) data as well by intensive caterpillar sampling from canopy fogging.
The CDI and NCDI strongly correlated with optical and TLS data (Spearman's ρ = 0.79 and 0.84, respectively). The ΔNCDII\(_{Defoliation(A−C)}\) significantly explained caterpillar abundance (R\(^{2}\) = 0.52). The NCDI at critical timesteps and ΔNCDI related to defoliation and refoliation well discriminated between heavily and lightly defoliated forests.
We demonstrate that the high spatial and temporal resolution and the cloud independence of Sentinel-1 radar potentially enable spatially unrestricted measurements of the highly dynamic canopy herbivory. This can help monitor insect pests, improve the prediction of outbreaks and facilitate the monitoring of forest disturbance, one of the high priority Essential Biodiversity Variables, in the near future.
Usher syndrome, the most prevalent cause of combined hereditary vision and hearing impairment, is clinically and genetically heterogeneous. Moreover, several conditions with phenotypes overlapping Usher syndrome have been described. This makes the molecular diagnosis of hereditary deaf-blindness challenging. Here, we performed exome sequencing and analysis on 7 Mexican and 52 Iranian probands with combined retinal degeneration and hearing impairment (without intellectual disability). Clinical assessment involved ophthalmological examination and hearing loss questionnaire. Usher syndrome, most frequently due to biallelic variants in MYO7A (USH1B in 16 probands), USH2A (17 probands), and ADGRV1 (USH2C in 7 probands), was diagnosed in 44 of 59 (75%) unrelated probands. Almost half of the identified variants were novel. Nine of 59 (15%) probands displayed other genetic entities with dual sensory impairment, including Alström syndrome (3 patients), cone-rod dystrophy and hearing loss 1 (2 probands), and Heimler syndrome (1 patient). Unexpected findings included one proband each with Scheie syndrome, coenzyme Q10 deficiency, and pseudoxanthoma elasticum. In four probands, including three Usher cases, dual sensory impairment was either modified/aggravated or caused by variants in distinct genes associated with retinal degeneration and/or hearing loss. The overall diagnostic yield of whole exome analysis in our deaf-blind cohort was 92%. Two (3%) probands were partially solved and only 3 (5%) remained without any molecular diagnosis. In many cases, the molecular diagnosis is important to guide genetic counseling, to support prognostic outcomes and decisions with currently available and evolving treatment modalities.
Synthese einer Bibliothek von Aminosäure-basierten Oligopeptid-Amphiphilen mittels Festphasensynthese, deren kovalente Knüpfung an einen nukleophilen Kern zu C3-symmetrischen Sternmesogenen und die Analyse der Einflüsse der verwendeten Aminosäuren auf die Sekundärstruktur des synthetisierten Moleküls.
Hintergrund - Die Multiple Sklerose (MS) ist bis heute eine nur teilweise verstandene Autoimmunerkrankung des zentralen Nervensystems (ZNS). Das Tiermodell der experimentellen autoimmunen Enzephalomyelitis (EAE) ermöglicht die Erforschung von Teilaspekten der Pathogenese der MS und kann zur Etablierung von Therapeutika herangezogen werden. Die MP4-abhängige EAE ermöglicht als Mausmodell die gezielte Erforschung der Rolle der B-Zelle als Akteur in der Pathogenese der MS. Diese Dissertation untersuchte den Effekt des S1P1-Rezeptor-Modulators FTY720 (Fingolimod) auf die Immunantwort der autoreaktiven B-Zellen in der Peripherie sowie im ZNS.
Methoden - MP4-immunisierte Mäuse erhielten 50 Tage nach dem EAE-Krankheitsbeginn oral appliziertes FTY720 über einen Zeitraum von 30 Tagen. Die Tiere wurden nach dem Auftreten der Krankheitssymptome täglich klinisch evaluiert. Die MP4-spezifische B-Zell-Immunantwort und die MP4-spezifische humorale Immunreaktion wurden mittels ELISPOT und ELISA ausgewertet. Die Verteilung der T- und B-Zell-Anteile im peripheren Blut der Mäuse sowie die Aufteilung der B-Zell-Subsets in der Milz wurden mittels Durchflusszytometrie quantifiziert. Mittels Immunhistochemie wurden die B- und T-Zell-Ansammlungen im ZNS der Mäuse hinsichtlich ihrer Entwicklung in tertiär lymphatische Organe (TLOs) untersucht.
Ergebnisse - In diesem Versuchsaufbau zeigte FTY720 keine signifikante Verbesserung des klinischen Krankheitsverlaufes der Tiere. Der Anteil von T-Zellen im peripheren Blut der Mäuse war unter der Therapie mit FTY720 signifikant reduziert, während die Anzahl an B-Zellen nicht-signifikant beeinflusst wurde. Bei der Untersuchung der B-Zell-Subtypen in der Milz fiel zunächst ein erhöhter Anteil an B220+-B-Zellen auf, während die Verteilung der weiteren Subsets nicht-signifikant verändert war. Unter der Therapie mit FTY720 zeigte sich keine Reduktion bereits etablierter B-Zell-Aggregate im ZNS, allerdings ist eine inhibierte Entwicklung in TLOs zu diskutieren.
Zusammenfassung - Diese Arbeit impliziert unterschiedliche Effekte von FTY720 auf die B-Zellen in einem B-Zell-abhängigen chronischen Mausmodell der MS.
Die Raumfahrt ist eine der konservativsten Industriebranchen. Neue Entwicklungen von Komponenten und Systemen beruhen auf existierenden Standards und eigene Erfahrungen der Entwickler. Die Systeme sollen in einem vorgegebenen engen Zeitrahmen projektiert, in sehr kleiner Stückzahl gefertigt und schließlich aufwendig qualifiziert werden. Erfahrungsgemäß reicht die Zeit für Entwicklungsiterationen und weitgehende Perfektionierung des Systems oft nicht aus. Fertige Sensoren, Subsysteme und Systeme sind Unikate, die nur für eine bestimme Funktion und in manchen Fällen sogar nur für bestimmte Missionen konzipiert sind. Eine Neuentwicklung solcher Komponenten ist extrem teuer und risikobehaftet. Deswegen werden flugerprobte Systeme ohne Änderungen und Optimierung mehrere Jahre eingesetzt, ohne Technologiefortschritte zu berücksichtigen.
Aufgrund des enormen finanziellen Aufwandes und der Trägheit ist die konventionelle Vorgehensweise in der Entwicklung nicht direkt auf Kleinsatelliten übertragbar. Eine dynamische Entwicklung im Low Cost Bereich benötigt eine universale und für unterschiedliche Anwendungsbereiche leicht modifizierbare Strategie. Diese Strategie soll nicht nur flexibel sein, sondern auch zu einer möglichst optimalen und effizienten Hardwarelösung führen.
Diese Arbeit stellt ein Software-Tool für eine zeit- und kosteneffiziente Entwicklung von Sternsensoren für Kleinsatelliten vor. Um eine maximale Leistung des Komplettsystems zu erreichen, soll der Sensor die Anforderungen und Randbedingungen vorgegebener Anwendungen erfüllen und darüber hinaus für diese Anwendungen optimiert sein. Wegen der komplexen Zusammenhänge zwischen den Parametern optischer Sensorsysteme ist keine
„straightforward" Lösung des Problems möglich. Nur durch den Einsatz computerbasierter Optimierungsverfahren kann schnell und effizient ein bestmögliches Systemkonzept für die gegebenen Randbedingungen ausgearbeitet werden.
G-protein-coupled receptors (GPCRs) are hypothesized to possess molecular mobility over a wide temporal range. Until now the temporal range has not been fully accessible due to the crucially limited temporal range of available methods. This in turn, may lead relevant dynamic constants to remain masked. Here, we expand this dynamic range by combining fluorescent techniques using a spot confocal setup. We decipher mobility constants of β\(_{2}\)-adrenergic receptor over a wide time range (nanosecond to second). Particularly, a translational mobility (10 µm\(^{2}\)/s), one order of magnitude faster than membrane associated lateral mobility that explains membrane protein turnover and suggests a wider picture of the GPCR availability on the plasma membrane. And a so far elusive rotational mobility (1-200 µs) which depicts a previously overlooked dynamic component that, despite all complexity, behaves largely as predicted by the Saffman-Delbrück model.
Protein-DNA interactions are central to many biological processes and form the bedrock of gene transcription, DNA replication, and DNA repair processes. Many proteins recognize specific sequences in DNA- a restriction enzyme must only cut at the correct sequence and a transcription factor should bind at its consensus sequence. Some proteins are designed to bind to specific structural or chemical features in DNA, such as DNA repair proteins and some DNA modifying enzymes. Target-specific DNA binding proteins initially bind to non-specific DNA and then search for their target sites through different types of diffusion mechanisms. Atomic force microscopy (AFM) is a single-molecule technique that is specifically well-suited to resolve the distinct states of target-specific as well as nonspecific protein-DNA interactions that are vital for a deeper insight into the target site search mechanisms of these enzymes. In this thesis, protein systems involved in epigenetic regulation, base excision repair (BER), and transcription are investigated by single-molecule AFM analyses complemented by biochemical and biophysical experiments.
The first chapter of this thesis narrates the establishment of a novel, user-unbiased MatLab-based tool for automated DNA bend angle measurements on AFM data. This tool has then been employed to study the initial lesion detection step of several DNA glycosylases. These results promoted a model describing the altered plasticities of DNA at the target lesions of DNA glycosylases as the fundamental mechanism for their enhanced efficiency of lesion detection.
In the second chapter of this thesis, the novel automated tool has been further extended to provide protein binding positions on the DNA along with corresponding DNA bend angles and applied to the study of DNMT3A DNA methyltransferase. These AFM studies revealed preferential co-methylation at specific, defined distances between two CpG sites by the enzyme and when combined with biochemical analyses and structural modelling supported novel modes of CpG co-methylation by DNMT3A.
In the third chapter of this thesis, the role of 8-oxo-guanine glycosylase (hOGG1) in Myc-mediated transcription initiation has been investigated. AFM analyses revealed that in the presence of oxidative damage in DNA, Myc is recruited to its target site (E-box) by hOGG1 through direct protein-protein interactions, specifically under oxidizing conditions. Intriguingly, oxidation of hOGG1 was further observed to result in dimerization of hOGG1, which may also play a role in the mechanism of transcription regulation by hOGG1 under oxidative stress.
Impacts of climate variability and change on Maize (\(Zea\) \(mays\)) production in tropical Africa
(2022)
Climate change is undeniable and constitutes one of the major threats of the 21st century. It impacts sectors of our society, usually negatively, and is likely to worsen towards the middle and end of the century. The agricultural sector is of particular concern, for it is the primary source of food and is strongly dependent on the weather. Considerable attention has been given to the impact of climate change on African agriculture because of the continent’s high vulnerability, which is mainly due to its low adaptation capac- ity. Several studies have been implemented to evaluate the impact of climate change on this continent. The results are sometimes controversial since the studies are based on different approaches, climate models and crop yield datasets. This study attempts to contribute substantially to this large topic by suggesting specific types of climate pre- dictors. The study focuses on tropical Africa and its maize yield. Maize is considered to be the most important crop in this region. To estimate the effect of climate change on maize yield, the study began by developing a robust cross-validated multiple linear regression model, which related climate predictors and maize yield. This statistical trans- fer function is reputed to be less prone to overfitting and multicollinearity problems. It is capable of selecting robust predictors, which have a physical meaning. Therefore, the study combined: large-scale predictors, which were derived from the principal component analysis of the monthly precipitation and temperature; traditional local-scale predictors, mainly, the mean precipitation, mean temperature, maximum temperature and minimum temperature; and the Water Requirement Satisfaction Index (WRSI), derived from the specific crop (maize) water balance model. The projected maize-yield change is forced by a regional climate model (RCM) REMO under two emission scenarios: high emission scenario (RCP8.5) and mid-range emission scenario (RCP4.5). The different effects of these groups of predictors in projecting the future maize-yield changes were also assessed. Furthermore, the study analysed the impact of climate change on the global WRSI. The results indicate that almost 27 % of the interannual variability of maize production of the entire region is explained by climate variables. The influence of climate predictors on maize-yield production is more pronounced in West Africa, reaching 55 % in some areas. The model projection indicates that the maize yield in the entire region is expected to decrease by the middle of the century under an RCP8.5 emission scenario, and from the middle of the century to the end of the century, the production will slightly recover but will remain negative (around -10 %). However, in some regions of East Africa, a slight increase in maize yield is expected. The maize-yield projection under RCP4.5 remains relatively unchanged compared to the baseline period (1982-2016). The results further indicate that large-scale predictors are the most critical drivers of the global year-to-year maize-yield variability, and ENSO – which is highly correlated with the most important predictor (PC2) – seems to be the physical process underlying this variability. The effects of local predictors are more pronounced in the eastern parts of the region. The impact of the future climate change on WRSI reveals that the availability of maize water is expected to decrease everywhere, except in some parts of eastern Africa.
Defects in DNA repair pathways have been associated with an improved response to immune checkpoint inhibition (ICI). In particular, patients with the nucleotide excision repair (NER) defect disease Xeroderma pigmentosum (XP) responded impressively well to ICI treatment. Recently, in melanoma patients, pretherapeutic XP gene expression was predictive for anti-programmed cell death-1 (PD-1) ICI response. The underlying mechanisms of this finding are still to be revealed. Therefore, we used CRISPR/Cas9 to disrupt XPA in A375 melanoma cells. The resulting subclonal cell lines were investigated by Sanger sequencing. Based on their genetic sequence, candidates from XPA exon 1 and 2 were selected and further analyzed by immunoblotting, immunofluorescence, HCR and MTT assays. In XPA exon 1, we established a homozygous (c.19delG; p.A7Lfs*8) and a compound heterozygous (c.19delG/c.19_20insG; p.A7Lfs*8/p.A7Gfs*55) cell line. In XPA exon 2, we generated a compound heterozygous mutated cell line (c.206_208delTTG/c.208_209delGA; p.I69_D70delinsN/p.D70Hfs*31). The better performance of the homozygous than the heterozygous mutated exon 1 cells in DNA damage repair (HCR) and post-UV-C cell survival (MTT), was associated with the expression of a novel XPA protein variant. The results of our study serve as the fundamental basis for the investigation of the immunological consequences of XPA disruption in melanoma.
Hematopoietic stem and progenitor cell (HSPC) maintenance and the differentiation of various lineages is a highly complex but precisely regulated process. Multiple signaling pathways and an array of transcription factors influence HSPC maintenance and the differentiation of individual lineages to constitute a functional hematopoietic system. Nuclear factor of activated T cell (NFAT) family transcription factors have been studied in the context of development and function of multiple mature hematopoietic lineage cells. However, until now their contribution in HSPC physiology and HSPC differentiation to multiple hematopoietic lineages has remained poorly understood. Here, we show that NFAT proteins, specifically NFATc1, play an indispensable role in the maintenance of HSPCs. In the absence of NFATc1, very few HSPCs develop in the bone marrow, which are functionally defective. In addition to HSPC maintenance, NFATc1 also critically regulates differentiation of lymphoid, myeloid, and erythroid lineage cells from HSPCs. Deficiency of NFATc1 strongly impaired, while enhanced NFATc1 activity augmented, the differentiation of these lineages, which further attested to the vital involvement of NFATc1 in regulating hematopoiesis. Hematopoietic defects due to lack of NFATc1 activity can lead to severe pathologies such as lymphopenia, myelopenia, and a drastically reduced lifespan underlining the critical role NFATc1 plays in HSPC maintenance and in the differentaion of various lineages. Our findings suggest that NFATc1 is a critical component of the myriad signaling and transcriptional regulators that are essential to maintain normal hematopoiesis.
The transcription factors of the nuclear factor of activated T cell (NFAT) family play a crucial role in multiple aspects of T cell function. It has recently been reported that NFATs play an important role in the suppressive function of CD4\(^+\)CD25\(^+\)Foxp3\(^+\) regulatory T (T\(_{reg}\)) cells. In this study, we have investigated the role of NFATs in the thymic development of T\(_{reg}\) cells in mice. We show that NFAT factors are dispensable for the development of Foxp3\(^+\) T\(_{reg}\) cells in the thymus but are critical for the maintenance of both the phenotype and survival of T\(_{reg}\) cells in the thymus as well as in peripheral lymphoid organs. Specifically, the homeostasis of CD4\(^+\)CD25\(^+\)Foxp3\(^+\) but not the CD4\(^+\)CD25\(^-\)Foxp3\(^+\) fraction is severely perturbed when NFAT signaling is blocked, leading to a strongly reduced T\(_{reg}\) population. We underscored this intriguing effect of NFAT on CD4\(^+\)CD25\(^+\)Foxp3\(^+\) T\(_{reg}\) cells to the disruption of survival signals provided by interleukin 2 (IL-2). Accordingly, blocking T\(_{reg}\) cell death by abolishing the activity of pro-apoptotic Bcl-2 family member Bim, compensated for the survival defects induced due to a lack of NFAT-IL-2-IL-2R signaling. Inhibition of NFAT activity led to a strong reduction in the number of Foxp3\(^+\) T\(_{reg}\) cells; however, it did not influence the level of Foxp3 expression on an individual cell basis. In addition, we show a differential effect of IL-2 and IL-7 signaling on Foxp3\(^+\) T\(_{reg}\) versus CD4\(^+\)CD25\(^-\) T cell development, again underlining the dispensability of NFAT signaling in the development, but not in the maintenance of Foxp3\(^+\) T\(_{reg}\) cells.
Photo‐initiated intramolecular charge transfer (ICT) processes play a pivotal role in the excited state reaction dynamics in donor‐bridge‐acceptor systems. The efficacy of such a process can be improved by modifying the extent of π‐conjugation, relative orientation/twists of the donor/acceptor entities and polarity of the environment. Herein, 4‐dimethylamino‐4′‐cyanodiphenylacetylene (DACN‐DPA), a typical donor‐π‐bridge‐acceptor system, was chosen to unravel the role of various internal coordinates that govern the extent of photo‐initiated ICT dynamics. Transient absorption (TA) spectra of DACN‐DPA in n‐hexane exhibit a lifetime of >2 ns indicating the formation of a triplet state while, in acetonitrile, a short time‐constant of ∼2 ps indicates the formation of charge transferred species. Ultrafast Raman loss spectroscopy (URLS) measurements show distinct temporal and spectral dynamics of Raman bands associated with C≡C and C=C stretching vibrations. The appearance of a new band at ∼1492 cm\(^{−1}\) in acetonitrile clearly indicates structural modification during the ultrafast ICT process. Furthermore, these observations are supported by TD‐DFT computations.
We present a technique for computing multi-branch-point covers with prescribed ramification and demonstrate the applicability of our method in relatively large degrees by computing several families of polynomials with symplectic and linear Galois groups.
As a first application, we present polynomials over \(\mathbb{Q}(\alpha,t)\) for the primitive rank-3 groups \(PSp_4(3)\) and \(PSp_4(3).C_2\) of degree 27 and for the 2-transitive group \(PSp_6(2)\) in its actions on 28 and 36 points, respectively. Moreover, the degree-28 polynomial for \(PSp_6(2)\) admits infinitely many totally real specializations.
Next, we present the first (to the best of our knowledge) explicit polynomials for the 2-transitive linear groups \(PSL_4(3)\) and \(PGL_4(3)\) of degree 40, and the imprimitive group \(Aut(PGL_4(3))\) of degree 80.
Additionally, we negatively answer a question by König whether there exists a degree-63 rational function with rational coefficients and monodromy group \(PSL_6(2)\) ramified over at least four points. This is achieved due to the explicit computation of the corresponding hyperelliptic genus-3 Hurwitz curve parameterizing this family, followed by a search for rational points on it. As a byproduct of our calculations we obtain the first explicit \(Aut(PSL_6(2))\)-realizations over \(\mathbb{Q}(t)\).
At last, we present a technique by Elkies for bounding the transitivity degree of Galois groups. This provides an alternative way to verify the Galois groups from the previous chapters and also yields a proof that the monodromy group of a degree-276 cover computed by Monien is isomorphic to the sporadic 2-transitive Conway group \(Co_3\).
In the heart the β\(_1\)-adrenergic receptor (AR) and the β\(_2\)-AR, two prototypical G protein-coupled receptors (GPCRs), are both activated by the same hormones, namely adrenaline and noradrenaline. Both receptors couple to stimulatory G\(_s\) proteins, mediate an increase in cyclic adenosine monophosphate (cAMP) and influence the contractility and frequency of the heart upon stimulation. However, activation of the β\(_1\)-AR, not the β\(_2\)-AR, lead to other additional effects, such as changes in gene transcription resulting in cardiac hypertrophy, leading to speculations on how distinct effects can arise from receptors coupled to the same downstream signaling pathway.
In this thesis the question of whether this distinct behavior may originate from a differential localization of these two receptors in adult cardiomyocytes is addressed. Therefore, fluorescence spectroscopy tools are developed and implemented in order to elucidate the presence and dynamics of these endogenous receptors at the outer plasma membrane as well as on the T-tubular network of intact adult cardiomyocytes. This allows the visualization of confined localization and diffusion of the β\(_2\)-AR to the T-tubular network at endogenous expression. In contrast, the β\(_1\)-AR is found diffusing at both the outer plasma membrane and the T-tubules. Upon overexpression of the β\(_2\)-AR in adult transgenic cardiomyocytes, the receptors experience a loss of this compartmentalization and are also found at the cell surface. These data suggest that distinct signaling and functional effects can be controlled by specific cell surface targeting of the receptor subtypes.
The tools at the basis of this thesis work are a fluorescent adrenergic antagonist in combination of fluorescence fluctuation spectroscopy to monitor the localization and dynamics of the lowly expressed adrenergic receptors. Along the way to optimizing these approaches, I worked on combining widefield and confocal imaging in one setup, as well as implementing a stable autofocus mechanism using electrically tunable lenses.
The Indigenous tribe called the Wiwa lives retracted in the Sierra Nevada de Santa Marta, Colombia. Little is known about their health status and whether the health care system in place covers their needs. In 2017 and 2018, a permanent physician was in charge for the Wiwa. Diseases and complaints were registered, ranked, and classified with the ICD-10 coding. Datasets from the Indigenous health care provider Dusakawi, collected from local health points and health brigades travelling sporadically into the fields for short visits, were compared. Furthermore, a list of provided medication was evaluated regarding the recorded needs. The most common complaints found were respiratory, infectious and parasitic, and digestive diseases. The top ten diagnoses collected in the health points and in the health brigade datasets were similar, although with a different ranking. The available medication showed a basic coverage only, with a critical lack of treatment for many severe, chronic, and life-threatening diseases. Most of the detected diseases in the Indigenous population are avoidable by an improvement in health care access, an expansion of the provided medication, and an increase in knowledge, hygiene, and life standards.
Objectives
To assess the impact of HIIT performed at school, i.e. both in connection with physical education (intra-PE) and extracurricular sports activities (extra-PE), on the physical fitness and health of children and adolescents.
Methods
PubMed and SPORTDiscus were searched systematically utilizing the following criteria for inclusion: (1) healthy children and adolescents (5–18 years old) of normal weight; (2) HIIT performed intra- and/or extra-PE for at least 5 days at an intensity ≥ 80% of maximal heart rate (HR\(_{max}\)) or peak oxygen uptake (VO\(_{2peak}\)) or as Functional HIIT; (3) comparison with a control (HIIT versus alternative interventions); and (4) pre- and post-analysis of parameters related to physical fitness and health. The outcomes with HIIT and the control interventions were compared utilizing Hedges’ g effect size (ES) and associated 95% confidence intervals.
Results
Eleven studies involving 707 participants who performed intra-PE and 388 participants extra-PE HIIT were included. In comparison with the control interventions, intra-PE HIIT improved mean ES for neuromuscular and anaerobic performance (ES jump performance: 5.89 ± 5.67 (range 1.88–9.90); ES number of push-ups: 6.22 (range n.a.); ES number of sit-ups: 2.66 ± 2.02 (range 1.24–4.09)), as well as ES fasting glucose levels (− 2.68 (range n.a.)) more effectively, with large effect sizes. Extra-PE HIIT improved mean ES for neuromuscular and anaerobic performance (ES jump performance: 1.81 (range n.a.); ES number of sit-ups: 2.60 (range n.a.)) to an even greater extent, again with large effect sizes. Neither form of HIIT was more beneficial for parameters related to cardiorespiratory fitness than the control interventions.
Conclusion
Compared to other forms of exercise (e.g. low-to-moderate-intensity running or walking), both intra- and extra-PE HIIT result in greater improvements in neuromuscular and anaerobic performance, as well as in fasting levels of glucose in school children.
Plattform für das integrierte Management von Kollaborationen in Wertschöpfungsnetzwerken (PIMKoWe)
(2022)
Das Verbundprojekt „Plattform für das integrierte Management von Kollaborationen in Wertschöpfungsnetzwerken“ (PIMKoWe – Förderkennzeichen „02P17D160“) ist ein Forschungsvorhaben im Rahmen des Forschungsprogramms „Innovationen für die Produktion, Dienstleistung und Arbeit von morgen“ der Bekanntmachung „Industrie 4.0 – Intelligente Kollaborationen in dynamischen Wertschöpfungs-netzwerken“ (InKoWe). Das Forschungsvorhaben wurde mit Mitteln des Bundesministeriums für Bildung und Forschung (BMBF) gefördert und durch den Projektträger des Karlsruher Instituts für Technologie (PTKA) betreut.
Ziel des Forschungsprojekts PIMKoWe ist die Entwicklung und Bereitstellung einer Plattformlösung zur Flexibilisierung, Automatisierung und Absicherung von Kooperationen in Wertschöpfungsnetzwerken des industriellen Sektors.
Chronische Nierenerkrankungen gehen mit einer erhöhten kardiovaskulären Morbidität und Mortalität einher. Charakteristisch für chronische Nierenerkrankungen, insbesondere im Stadium der Dialysepflichtigkeit, ist eine ausgeprägte Voralterung der Gefäße. Die Vorgänge, die den beschleunigten vaskulären Alterungsprozessen zugrunde liegen, umfassen ein Zusammenspiel aus einem gestörten Mineralstoffwechsel, der Akkumulation urämischer Toxine und chronischer Inflammation. Das Renin-Angiotensin-Aldosteron-System (RAAS) nimmt dabei eine zentrale Rolle ein. Eine gesteigerte Aktivität des RAAS ist ein Merkmal von kardiorenalen Syndromen und moduliert jenseits seiner Effekte auf den Blutdruck vaskuläre Entzündungs- und Remodelingprozesse. Durch das vaskuläre Altern kommt es zur Abnahme arterieller Compliance und zur Erhöhung der Pulswellengeschwindigkeit (PWV). Dadurch erhöht sich das Risiko für Endorganschäden. Die arterielle Gefäßsteifigkeit ist ein unabhängiger Prädiktor für Mortalität bei chronisch-dialysepflichtiger Niereninsuffizienz und eine Reduktion arterieller Rigidität geht mit einem verbesserten Überleben einher. Randomisierte Studien bei Dialysepatienten konnten bislang keinen eindeutigen Nutzen etablierter pharmakologischer Interventionen zur Reduktion des kardiovaskulären Risikos und vaskulärer «Stiffeningprozesse» feststellen. Als ein potentiell wirksamer Therapieansatz werden Mineralokortikoidrezeptorantagonisten (MRA) angesehen. Die vorliegende Arbeit evaluierte im Rahmen der Placebo-kontrollierten, randomisierten «Mineralocorticoid-Receptor Antagonists in End-Stage Renal Disease» (MiREnDa) Studie, ob die tägliche Einnahme von 50 mg Spironolacton über neun Monate einen Effekt auf die vaskuläre Funktion bei Patienten mit dialysepflichtiger chronischer Nierenerkrankung hat. Neben aortaler PWV, Augmentationsindex, zentralem Puls- und Blutdruck wurden zur Evaluation der vaskulären Funktion die Compliance der thorakalen Aorta und der A. carotis communis sowie die Distensibilität der A. carotis communis und die fluss-vermittelte Dilatation der A. brachialis vor Studienbeginn als sekundäre Endpunkte festgelegt. Ein weiterer Aspekt, der evaluiert wurde, war die Frage nach Korrelationen zwischen PWV und Augmentationsindex einerseits und weiteren Parametern vaskulärer Funktion, klinischen Merkmalen und Biomarkern andererseits. Die vorliegende Arbeit versuchte darüber hinaus, klinische Merkmale (Komorbiditäten, Inflammation), die ein Therapieansprechen von MRA potentiell modulieren, zu identifizieren. Das zentrale Ergebnis der Arbeit war, dass eine MRA-Therapie mit 50 mg Spironolacton täglich über neun Monate im untersuchten Kollektiv keinen Effekt auf die vaskuläre Funktion zeigte.
Stalk cell polar ion transport provide for bladder‐based salinity tolerance in Chenopodium quinoa
(2022)
Chenopodium quinoa uses epidermal bladder cells (EBCs) to sequester excess salt. Each EBC complex consists of a leaf epidermal cell, a stalk cell, and the bladder.
Under salt stress, sodium (Na\(^{+}\)), chloride (Cl\(^{−}\)), potassium (K\(^{+}\)) and various metabolites are shuttled from the leaf lamina to the bladders. Stalk cells operate as both a selectivity filter and a flux controller.
In line with the nature of a transfer cell, advanced transmission electron tomography, electrophysiology, and fluorescent tracer flux studies revealed the stalk cell’s polar organization and bladder‐directed solute flow.
RNA sequencing and cluster analysis revealed the gene expression profiles of the stalk cells. Among the stalk cell enriched genes, ion channels and carriers as well as sugar transporters were most pronounced. Based on their electrophysiological fingerprint and thermodynamic considerations, a model for stalk cell transcellular transport was derived.
Spectroscopic methods were established decades ago in a wide variety of fields. This also applies to the pharmaceutical field, although they initially were mostly used for identity testing or structure elucidation only. Technical developments, such as miniaturization (NMR benchtop devices), Fourier transformations (for NMR, MIR spectroscopy) or the combination with chemometric evaluation (e.g., in Process Analytical Technology, PAT), have further increased their importance and opened up new applications. The aim of this work was to investigate further new approaches and to find new applications for already established methods and to show their benefits.
By means of MIR, NIR and NMR data and their chemometric evaluation (principal component analysis, PCA; hierarchical cluster analysis, HCA; linear discriminant analysis, LDA), possibilities were presented to successfully determine the manufacturer or the pharmaceutical company of various paracetamol preparations. In the course of this, various similarities and correlations between the preparations of individual companies could also be identified. For this purpose, a suitable sample preparation was developed for each spectroscopic method, and suitable measurement parameters in order to obtain reproducible spectra for the chemometric evaluation were determined. Furthermore, the results of the two unsupervised methods (HCA, PCA) were compared with each other. The HCA was able to confirm those of the PCA for the very most part. Additionally, through these methods it was possible to characterize many of the preparations based on clusters formed by comparable tablet compositions.
In order to be able to measure unmortared, whole tablets using the NIR spectrometer, an attachment was developed and manufactured using 3D printing. Its functionality was demonstrated by measuring and analyzing the tablets of two different batches of nine paracetamol preparations. The batches were clearly distinguished on the basis of a PCA and a significant difference was also demonstrated by means of statistical tests.
For NMR spectroscopy, a method was developed to obtain optimized "fingerprint" spectra of drug formulations. For this purpose, a 1D DOSY measurement was elaborated, in which the signals of the active ingredient could be filtered out by the appropriate choice of measurement parameters. The chemometric evaluation can thus focus on the remaining signals of the excipients, on the basis of which the preparations of the same API can be distinguished. Especially in the case of formulations that consist largely of active ingredient, data pre processing of the spectra can thus be simplified and greater importance can be assigned to the originally very small excipient signals.
A quantitative 1H NMR method was developed for the comparison of a high field spectrometer (400 MHz) with a benchtop spectrometer (80 MHz) for two finished drugs. It was shown that it is possible to obtain comparable results with both instruments, but that the influence of the excipients on the signals and the lower resolution of the benchtop instrument must be taken into account. Therefore, it was not possible to obtain comparable results without further optimization of the method for one of the active ingredients.
In the investigation of various reactions between APIs and excipients using DOSY, its usefulness as a screening method in stability testing was demonstrated. For this purpose, three different APIs and excipients were stressed together and the reaction mixtures were subsequently measured using DOSY. Based on the translational diffusion coefficient, the reaction products could be identified and distinguished from the active ingredients and the excipients used. The importance of thoughtful processing could also be demonstrated. If all peak heights are selected when evaluating signals split by direct spin spin coupling, this allows the detection of hidden signals as long as not all signals have the same diffusion coefficient. The selective selection of individual peak heights in the case of split signals also enables the evaluation of signals that overlap slightly. However, the limitations of this method were also shown when two signals overlap too much and differ too little in their diffusion coefficients.
Hence, it has been successfully demonstrated in the various projects that the new chemometric approaches, as well as the new applications of already established methods, enable in depth findings and thus have a clear added value.
Regular physical activity during childhood and adolescence is associated with health benefits. Consequently, numerous health promotion programs for children and adolescents emphasize the enhancement of physical activity. However, the ActivityStat hypothesis states that increases in physical activity in one domain are compensated for by decreasing physical activity in another domain. Currently, little is known about how physical activity varies in children and adolescents within intervals of one day or multiple days. This systematic review provides an overview of studies that analyzed changes in (overall) physical activity, which were assessed with objective measurements, or compensatory mechanisms caused by increases or decreases in physical activity in a specific domain in children and adolescents. A systematic search of electronic databases (PubMed, Scopus, Web of Science, SportDiscus) was performed with a priori defined inclusion criteria. Two independent researchers screened the literature and identified and rated the methodological quality of the studies. A total of 77 peer-reviewed articles were included that analyzed changes in overall physical activity with multiple methodological approaches resulting in compensation or displacement. Of 40,829 participants, 16,265 indicated compensation associated with physical activity. Subgroup analyses separated by study design, participants, measurement instrument, physical activity context, and intervention duration also showed mixed results toward an indication of compensation. Quality assessment of the included studies revealed that they were of high quality (mean = 0.866). This review provides inconclusive results about compensation in relation to physical activity. A trend toward increased compensation in interventional studies and in interventions of longer duration have been observed.
Das fortgeschrittene Nebennierenkarzinom stellt Mediziner:innen im klinischen Alltag mit seinem aggressiven Verhalten vor eine große therapeutische Herausforderung. Bisher nimmt Mitotane die zentrale Rolle der medikamentösen Tumortherapie ein. Obwohl es seit über 60 Jahren im Einsatz ist, wurde die Frage der Effektivität einer Monotherapie im fortgeschrittenen Stadium in der Literatur bisher nur wenig untersucht. Daher wurden in dieser retrospektiven Studie Daten von 127 Patient:innen aus dem deutschen Nebennierenkarzinomregister untersucht, welche eine Mitotanemonotherapie bei Erst/- Rezidivdiagnose eines fortgeschrittenen ACC erhielten. Anhand dieses Datensatzes wurde die Ansprechrate, das progressionsfreie und Gesamtüberleben mithilfe der Kaplan- Meier- Methode ermittelt. Darüber hinaus wurde der Versuch einer Definition potenzieller Prädiktoren für ein verbessertes Ansprechen mittels Cox- Regressionsanalyse unternommen. Insgesamt wurde bei 26 Patient:innen (20,5%) ein objektives Ansprechen erzielt, von denen 3 Patient:innen eine komplette und 23 Patient:innen eine partielle Remission erreichten. Bei 32 weiteren Patient:innen (25,2%) wurde eine Stabilisierung der Erkrankung verzeichnet. Das progressionsfreie Überleben lag im Median bei 4,1 Monaten, das mediane Gesamtüberleben betrug 18,5 Monate. In der multivariaten Cox- Regressionsanalyse konnten zwei wesentliche, unabhängige Faktoren identifiziert werden: Patient:innen mit einer niedrigen Tumorlast (definiert als <10 Läsionen) scheinen im Vergleich zu Patient:innen mit einer höheren Tumorlast von der Therapie hinsichtlich des progressionsfreien Überlebens (HR:0,51; 95%-CI:0,33-0,79; p=0,02) und Gesamtüberlebens (HR:0,59; 95%-CI: 0,30-0,91; p=0,017) besser zu profitieren. Interessanterweise zeigen Patient:innen, die Mitotane erst zum Zeitpunkt eines Spätrezidivs (>360 Tage nach Erstdiagnose) erhalten haben, ein deutlich besseres Ansprechen im Vergleich zu Patient:innen, welche Mitotane unmittelbar nach Erstdiagnose erhielten: Es zeigte sich ein verlängertes progressionsfreies Überleben (HR: 0,35; 95%-CI: 0,23-0,55; p=0,001) und Gesamtüberleben (HR: 0,34; 95%-CI: 0,22-0,52; p=0,001). In der weiteren Analyse zeigte sich, dass sich ein Mitotanespiegel von >14mg/l günstig auf ein verbessertes Gesamtüberleben auswirkt. Zusammenfassend zeigt unsere bisher weltweit größte zu diesem Thema durchgeführte Studie, dass eine Mitotanemonotherapie unter bestimmten Voraussetzungen zu sehr guten Ergebnissen führen kann: Dabei scheinen Patient:innen mit einer niedrigen Tumorlast und dem späten Beginn einer Mitotanetherapie besonders geeignet für diese Therapiemodalität zu sein, während man Patient:innen mit Metastasen bei Erstdiagnose bzw. einer hohen Tumorlast zum Zeitpunkts des Rezidivs besser direkt mit einer Kombination aus Mitotane plus zytotoxischer Chemotherapie behandelt.
The neuropeptide pigment-dispersing factor (PDF) plays a prominent role in the circadian clock of many insects including honey bees. In the honey bee brain, PDF is expressed in about 15 clock neurons per hemisphere that lie between the central brain and the optic lobes. As in other insects, the bee PDF neurons form wide arborizations in the brain, but certain differences are evident. For example, they arborize only sparsely in the accessory medulla (AME), which serves as important communication center of the circadian clock in cockroaches and flies. Furthermore, all bee PDF neurons cluster together, which makes it impossible to distinguish individual projections. Here, we investigated the developing bee PDF network and found that the first three PDF neurons arise in the third larval instar and form a dense network of varicose fibers at the base of the developing medulla that strongly resembles the AME of hemimetabolous insects. In addition, they send faint fibers toward the lateral superior protocerebrum. In last larval instar, PDF cells with larger somata appear and send fibers toward the distal medulla and the medial protocerebrum. In the dorsal part of the medulla serpentine layer, a small PDF knot evolves from which PDF fibers extend ventrally. This knot disappears during metamorphosis and the varicose arborizations in the putative AME become fainter. Instead, a new strongly stained PDF fiber hub appears in front of the lobula. Simultaneously, the number of PDF neurons increases and the PDF neuronal network in the brain gets continuously more complex.
Die Symbiose zwischen Mensch und Hund ist die wohl engste und zugleich auch älteste Verbindung zwischen Mensch und Natur.
Dass Hunde als Rudeltiere vorurteilsfrei und ehrlich die bewusste Nähe zu Menschen suchen, wurde sich bereits im anglo-amerikanischen Raum im psychologisch-pädagogischen Bereich bedient.
Im Internatsbereich der Caritas Don Bosco gGmbH, bei dem das Promotionsprojekt ein halbes Jahr stattgefunden hat, sind die jungen Menschen, die aufgrund einer physischen bzw. psychischen Teilhabeeinschränkung eine berufliche Reha-Maßnahme durchlaufen, untergebracht.
Aufgrund des vorausgegangenen Versagens in ihrer vorigen (Bildungs-)Laufbahn, ihrer negativen Erfahrungen oder auch wegen ihrer Einschränkungen besitzen sie kaum bis keinerlei soziale Kompetenzen, die für ein späteres Leben in der Gesellschaft unerlässlich sind. Da das Tier mit keinerlei Erwartungshaltung an die Betroffenen herangeht, kann sich dies zunutze gemacht werden. Den jungen Menschen wird in diesem tiergestützten Trainingskonzept die Möglichkeit gegeben, in verschiedenen Übungsinteraktionen mit dem Hund ihr (non-)verbales Verhalten abzustimmen, um anschließend einen sozio-emotionalen Kompetenzzuwachs zu erlangen, der sich dann im Verlauf unterbewusst auf den zwischenmenschlichen Bereich transformieren lässt.
In dieser Arbeit zeigt sich, inwieweit der eingesetzte Hund, den jungen Menschen als assistierendes Erziehungsmittel der pädagogischen Studienleiterin dabei helfen kann, über die positiven, nonverbalen Interaktionserfahrungen mit dem Tier einen sozio-emotionalen Kompetenzzuwachs zu erlangen.
Echolocation behavior, a navigation strategy based on acoustic signals, allows scientists to explore neural processing of behaviorally relevant stimuli. For the purpose of orientation, bats broadcast echolocation calls and extract spatial information from the echoes. Because bats control call emission and thus the availability of spatial information, the behavioral relevance of these signals is undiscussable. While most neurophysiological studies, conducted in the past, used synthesized acoustic stimuli that mimic portions of the echolocation signals, recent progress has been made to understand how naturalistic echolocation signals are encoded in the bat brain. Here, we review how does stimulus history affect neural processing, how spatial information from multiple objects and how echolocation signals embedded in a naturalistic, noisy environment are processed in the bat brain. We end our review by discussing the huge potential that state-of-the-art recording techniques provide to gain a more complete picture on the neuroethology of echolocation behavior.
Die Arbeit untersucht Zusammenhänge zwischen der Veränderung geometrischer Parameter (gemessen an Röntgenaufnahmen) des Hüftgelenks durch den endoprothetischen Eingriff (primäre zementfreien Hüft-TEP) und dem patientenberichteten Outcome (EuroQol und WOMAC-Scores prä- sowie ein Jahr postoperativ) zu untersuchen. Hierzu wurden 655 Patienten (w: 336, m: 319) eingeschlossen (OP- Zeitraum von 2012–2014).
Im Mittel wurde der globale Offset (GO) um -1,14mm verringert (Vergrößerung des femoralen Offset (FO) durch den Eingriff um +4,61 mm und Verminderung des acetabulären Offsets (AO) um -5,74 mm). Bei den Frauen zeigte sich eine Vergrößerung des GO um +0,27 mm (AO -5,08 mm und FO +5,37 mm), bei den Männer eine Verkleinerung des GO um -2,62 mm (AO -6,43 mm und FO 3,81 mm).
In der Gesamtgruppe zeigten die Parameter der horizontalen Achse AO und FO keine Korrelationen zum Outcome. Jedoch konnte für den GO eine Korrelation zum EuroQol nachgewiesen werden (r=0,097; p<0,05) nachgewiesen werden. In der Gruppe der Frauen konnte eine positive Korrelation zwischen dem AO und dem WOMAC-Gesamtscore (r= 0,132; p<0,05) sowie den Subscores Schmerz (r=0,113; p<0,05) und Funktion (r=0,125; p<0,05) nachgewiesen werden. Die Ergebnisse bestätigen den Vorteil einer Medialisierung der Pfanne.
Bei der Analyse der Parameter der vertikale Achse (vertikaler Offset (VO), Hüftlänge (HL), Hip Center Height (HCH)) ergab sich in der Gesamtgruppe eine negative Korrelation des VO mit den WOMAC-Gesamtscore-Werten (r=-0,109; p<0,01) und den Werten des Subscores WOMAC-Schwierigkeit (r=0,106; p<0,01). Bei der HCH zeigte sich eine schwach positive Korrelation mit dem Subscore WOMAC-Schwierigkeit (r=0,081; p<0,05) und mit dem EurQol (r=0,0117; p<0,01). In der Subgruppe der Frauen ergaben sich bei der HCH eine Korrelation mit dem WOMAC-Gesamtscore (r=0,109; p<0,05) und dem Subscore WOMAC-Funktion (r=0,125; p<0,05). Die HL korrelierte in der Gruppe der Männer negativ mit dem WOMAC-Steifheit (r= -0,137; p<0,05). Die Daten bezüglich der vertikalen Achse deuten darauf hin, dass eine Vergrößerung des vertikalen Offsets sinnvoll zu sein scheint.
Bezüglich der diagonalen Achse konnte für den diagonalen Offset (def. als Vektor von GO und BL) ein positiver Zusammenhang mit dem EuroQol (r=0,110; p<0,01) nachgewiesen werden.
Mycobacterium tuberculosis (Mtb) inhibits host oxidative stress responses facilitating its survival in macrophages; however, the underlying molecular mechanisms are poorly understood. Here, we identified a Mtb acetyltransferase (Rv3034c) as a novel counter actor of macrophage oxidative stress responses by inducing peroxisome formation. An inducible Rv3034c deletion mutant of Mtb failed to induce peroxisome biogenesis, expression of the peroxisomal β-oxidation pathway intermediates (ACOX1, ACAA1, MFP2) in macrophages, resulting in reduced intracellular survival compared to the parental strain. This reduced virulence phenotype was rescued by repletion of Rv3034c. Peroxisome induction depended on the interaction between Rv3034c and the macrophage mannose receptor (MR). Interaction between Rv3034c and MR induced expression of the peroxisomal biogenesis proteins PEX5p, PEX13p, PEX14p, PEX11β, PEX19p, the peroxisomal membrane lipid transporter ABCD3, and catalase. Expression of PEX14p and ABCD3 was also enhanced in lungs from Mtb aerosol-infected mice. This is the first report that peroxisome-mediated control of ROS balance is essential for innate immune responses to Mtb but can be counteracted by the mycobacterial acetyltransferase Rv3034c. Thus, peroxisomes represent interesting targets for host-directed therapeutics to tuberculosis.
Einleitung: Für die Präzision und Genauigkeit einer Abformung ist die Dimensionsstabilität der Abformmaterialien eine wichtige Einflussgröße. Sie sollte über einen längeren Zeitraum bestehen, damit auch nach mehreren Stunden oder Tagen Abdrücke als Grundlage zur präzisen Modellherstellung verwendet werden können. Ziel der vorliegenden Studie war es, die Dimensionsstabilität von drei Abformmaterialien unterschiedlicher Materialklassen in Abhängigkeit der Lagerzeiten zu untersuchen.
Methoden: Als Referenzkörper diente ein Nichtedelmetall-Modell mit präparierten Zahnstümpfen und Messkugeln. Dieses wurde mit den drei Abformmaterialien (A-Silikon: Affinis, Polyether: ImpregumDuoSoft, Vinylsiloxanether: Identium) jeweils 50-mal abgeformt. Die Abformungen wurden nach fünf verschiedenen Lagerzeiten. 30min, 2h, 8h, 24h und einer Woche, mit Superhartqips ausgegossen. Nach der Digitalisierung des Referenzkörpers und der Gipsmodelle erfolgte die 2D-Auswertung der Streckenabweichungen und die 3D-Auswertung der Flächen- und Volumenabweichungen.
Resultate: Die drei Abformmaterialien wiesen alle geringe Abweichungswerte im Mikrometerbereich auf und unterschieden sich untereinander nur geringfügig. Die prozentualen Dimensionsänderungen lagen bei dem A- Silikon Affinis zwischen 0,05±0,02% bis 0,76±0,14%, bei dem Polyether Impregum zwischen 0,01±0,07% bzw 1,12±0,34% und bei dem Vinylsiloxanether Identium zwischen 0,04±0,05% bis 0,142±0,00%. Während Affinis keine Dimensionsänderungen über eine Lagerzeit von bis zu einer Woche aufwies, kam es bei Impregum und Identium tendenziell Zu einem Anstieg der Abweichungswerte.
Konklusion: Alle drei Abformmaterialien ermöglichen präzise Abformungen und sind zufriedenstellend dimensionsstabil bei einer Lagerzeit von bis zu einer Woche.
In ischemic stroke (IS) impairment of the blood-brain barrier (BBB) has an important role in the secondary deterioration of neurological function. BBB disruption is associated with ischemia-induced inflammation, brain edema formation, and hemorrhagic infarct transformation, but the underlying mechanisms are incompletely understood. Dysfunction of endothelial cells (EC) may play a central role in this process. Although neuronal NLR-family pyrin domain-containing protein 3 (NLRP3) inflammasome upregulation is an established trigger of inflammation in IS, the contribution of its expression in EC is unclear. We here used brain EC, exposed them to oxygen and glucose deprivation (OGD) in vitro, and analyzed their survival depending on inflammasome inhibition with the NLRP3-specific drug MCC950. During OGD, EC death could significantly be reduced when targeting NLRP3, concomitant with diminished endothelial NLRP3 expression. Furthermore, MCC950 led to reduced levels of Caspase 1 (p20) and activated Gasdermin D as markers for pyroptosis. Moreover, inflammasome inhibition reduced the secretion of pro-inflammatory chemokines, cytokines, and matrix metalloproteinase-9 (MMP9) in EC. In a translational approach, IS was induced in C57Bl/6 mice by 60 mins transient middle cerebral artery occlusion and 23 hours of reperfusion. Stroke volume, functional outcome, the BBB integrity, and-in good agreement with the in vitro results-MMP9 secretion as well as EC survival improved significantly in MCC950-treated mice. In conclusion, our results establish the NLRP3 inflammasome as a critical pathogenic effector of stroke-induced BBB disruption by activating inflammatory signaling cascades and pyroptosis in brain EC.
Thrombolysis with recombinant tissue plasminogen activator (rt-PA) is a mainstay of acute ischemic stroke treatment but is associated with bleeding complications, especially after prolonged large vessel occlusion. Recently, inhibition of the NLRP3 inflammasome led to preserved blood–brain barrier (BBB) integrity in experimental stroke in vivo. To further address the potential of NLRP3 inflammasome inhibition as adjunct stroke treatment we used immortalized brain derived endothelial cells (bEnd5) as an in vitro model of the BBB. We treated bEnd5 with rt-PA in combination with the NLRP3 specific inhibitor MCC950 or vehicle under normoxic as well as ischemic (OGD) conditions. We found that rt-PA exerted a cytotoxic effect on bEnd5 cells under OGD confirming that rt-PA is harmful to the BBB. This detrimental effect could be significantly reduced by MCC950 treatment. Moreover, under ischemic conditions, the Cell Index — a sensible indicator for a patent BBB — and the protein expression of Zonula occludens 1 stabilized after MCC950 treatment. At the same time, the extent of endothelial cell death and NLRP3 expression decreased. In conclusion, NLRP3 inhibition can protect the BBB from rt-PA-induced damage and thereby potentially increase the narrow time window for safe thrombolysis in stroke.
Chemotherapy, the standard treatment for pancreatic ductal adenocarcinoma (PDAC), has only a modest effect on the outcome of patients with late-stage disease. Investigations of the genetic features of PDAC have demonstrated a frequent occurrence of mutations in genes involved in homologous recombination (HR), especially in the breast cancer susceptibility gene 2 (BRCA2). Olaparib, a poly(ADP-ribose) polymerase (PARP) inhibitor, is approved as a maintenance treatment for patients with advanced PDAC with germline BRCA1/2 mutations following a platinum-containing first-line regimen. Limitations to the use of PARP inhibitors are represented by the relatively small proportion of patients with mutations in BRCA1/2 genes and the modest capability of these substances of inducing objective response. We have previously shown that pancreatic cancer with BRCA2 mutations exhibits a remarkably enhanced sensitivity towards tumor-necrosis-factor-related apoptosis-inducing ligand (TRAIL) receptor-stimulating agents. We thus aimed to investigate the effect of combined treatment with PARP inhibitors and TRAIL receptor-stimulating agents in pancreatic cancer and its dependency on the BRCA2 gene status. The respective effects of TRAIL-targeting agents and the PARP inhibitor olaparib or of their combination were assessed in pancreatic cancer cell lines and patient-derived organoids. In addition, BRCA2-knockout and -complementation models were investigated. The effects of these agents on apoptosis, DNA damage, cell cycle, and receptor surface expression were assessed by immunofluorescence, Western blot, and flow cytometry. PARP inhibition and TRAIL synergized to cause cell death in pancreatic cancer cell lines and PDAC organoids. This effect proved independent of BRCA2 gene status in three independent models. Olaparib and TRAIL in combination caused a detectable increase in DNA damage and a concentration-dependent cell cycle arrest in the G2/M and S cell cycle phases. Olaparib also significantly increased the proportion of membrane-bound death receptor 5. Our results provide a preclinical rationale for the combination of PARP inhibitors and TRAIL receptor agonists for the treatment of pancreatic cancer and suggest that the use of PARP inhibitors could be extended to patients without BRCA2 mutations if used in combination with TRAIL agonists.
The rapid development of green and sustainable materials opens up new possibilities in the field of applied research. Such materials include nanocellulose composites that can integrate many components into composites and provide a good chassis for smart devices. In our study, we evaluate four approaches for turning a nanocellulose composite into an information storage or processing device: 1) nanocellulose can be a suitable carrier material and protect information stored in DNA. 2) Nucleotide-processing enzymes (polymerase and exonuclease) can be controlled by light after fusing them with light-gating domains; nucleotide substrate specificity can be changed by mutation or pH change (read-in and read-out of the information). 3) Semiconductors and electronic capabilities can be achieved: we show that nanocellulose is rendered electronic by iodine treatment replacing silicon including microstructures. Nanocellulose semiconductor properties are measured, and the resulting potential including single-electron transistors (SET) and their properties are modeled. Electric current can also be transported by DNA through G-quadruplex DNA molecules; these as well as classical silicon semiconductors can easily be integrated into the nanocellulose composite. 4) To elaborate upon miniaturization and integration for a smart nanocellulose chip device, we demonstrate pH-sensitive dyes in nanocellulose, nanopore creation, and kinase micropatterning on bacterial membranes as well as digital PCR micro-wells. Future application potential includes nano-3D printing and fast molecular processors (e.g., SETs) integrated with DNA storage and conventional electronics. This would also lead to environment-friendly nanocellulose chips for information processing as well as smart nanocellulose composites for biomedical applications and nano-factories.
Über die klinische Präsentation von Knochenmetastasen (KM) und ihre Komplikationen, sog. Skeletal-related events (SRE), beim medullären Schilddrüsenkarzinom (MTC) ist aktuell wenig bekannt. Es ist Ziel dieser multizentrischen Studie, klinische und morphologische Eigenschaften von KM beim MTC zu beschreiben und die prognostische Rolle der Morphologie der KM herauszuarbeiten. Außerdem wird die Rolle der antiresorptiven Therapie (ART) sowie der tumorspezifischen Behandlung mit Tyrosinkinase-Inhibitoren (TKI) untersucht.
Insgesamt wurden 114 Patienten mit einem MTC und KM, welche zwischen 1973 und 2016 an vier deutschen Kliniken mit Schwerpunktversorgung diagnostiziert wurden, in die Analyse eingeschlossen.
Zeit-bis-Event Analysen wurden mittels Kaplan-Meier Kurve dargestellt und Gruppen mit dem Log-Rank Test verglichen. Risikofaktoren wurden mit Cox Regression identifiziert.
KM wurden im Median 2,1 Jahre nach der Erstdiagnose MTC diagnostiziert und traten in 79 % der Fälle multifokal auf. Die häufigste Lokalisation war die Wirbelsäule (86 %), gefolgt von der Hüfte (60 %). Die Morphologie der KM war in 32 % osteolytisch, in 25 % osteoblastisch und in 22 % wurde eine gemischte Morphologie beschrieben (unbekannt: 21 %).
Innerhalb einer medianen Beobachtungszeit von 26,6 Monaten nach der Erstdiagnose KM trat in 47 % der Fälle mindestens ein SRE auf (Knochenbestrahlung 50 %, pathologische Frakturen 32 %). Davon waren 42 % bei Patienten mit osteoytischen und 17 % bei osteoblastischen KM zu finden (P = 0,047). Osteolytische Metastasen (HR 3,85, 95 % KI 1,52-9,77, P = 0,005) waren mit einem schlechterem Gesamtüberleben assoziiert. Bei Patienten, die präventiv eine ART erhielten, traten signifikant weniger SREs auf als bei unbehandelten Patienten (P = 0,04). In einer Subanalyse der 10 Patienten, die vor dem Auftreten eines SREs einen TKI erhalten hatten, waren signifikant weniger SREs zu verzeichnen (p= 0,013).
Die Studie zeigt eine Assoziation zwischen osteolytischen KM und einer schlechteren Prognose. ART sowie TKI könnten eine protektive Rolle zur Vorbeugung von knochenbezogenen Ereignissen haben. Prospektive Studien sind notwendig, um diese möglichen Zusammenhänge zu prüfen.
Osmotic stress can be detrimental to plants, whose survival relies heavily on proteomic plasticity. Protein ubiquitination is a central post-translational modification in osmotic-mediated stress. In this study, we used the K-Ɛ-GG antibody enrichment method integrated with high-resolution mass spectrometry to compile a list of 719 ubiquitinated lysine (K-Ub) residues from 450 Arabidopsis root membrane proteins (58% of which are transmembrane proteins), thereby adding to the database of ubiquitinated substrates in plants. Although no ubiquitin (Ub) motifs could be identified, the presence of acidic residues close to K-Ub was revealed. Our ubiquitinome analysis pointed to a broad role of ubiquitination in the internalization and sorting of cargo proteins. Moreover, the simultaneous proteome and ubiquitinome quantification showed that ubiquitination is mostly not involved in membrane protein degradation in response to short osmotic treatment but that it is putatively involved in protein internalization, as described for the aquaporin PIP2;1. Our in silico analysis of ubiquitinated proteins shows that two E2 Ub-conjugating enzymes, UBC32 and UBC34, putatively target membrane proteins under osmotic stress. Finally, we revealed a positive role for UBC32 and UBC34 in primary root growth under osmotic stress.
This dissertation describes the synthesis of an unsymmetrically-substituted triarylborane. This term describes a three-coordinate boron atom that is bound to three different aromatic systems, namely 2,6-dimethylphenyl, mesityl, and 4-(N,N-dimethylamino)-2,6-dimethylphenyl. It is also demonstrated that the amine functionality can be converted with methyl triflate into an ammonium moiety. The investigation of photophysical and electrochemical properties of this compound in comparison with the non-aminated and di-aminated analogues of the triarylborane is described besides other investigations of e. g. singlet oxygen sensitization, rotational barriers, and fundamental DFT calculations. Based on these investigations, selectively mono-, bis- and tris-dimethylamino- and trimethylammonium-substituted bis-triarylborane bithiophene chromophores were synthesized and their photophysical, and electrochemical properties were investigated together with the water solubility and singlet oxygen sensitizing efficiency of the cationic compounds Cat1+, Cat2+, Cat(i)2+, and Cat3+. Comparing these properties with the results obtained for the mono-triarylboranes reveals a large influence of the bridging unit on the investigated properties of the bis-triarylboranes. In addition, the interaction of the cationic bis-triarylboranes with different polynucleotides were investigated in buffered solutions as well as the ability of these selectively charged compounds to enter and localize within organelles of human lung carcinoma and normal lung cells. All these investigations demonstrate that the number of charges and their distribution influences the interactions and staining properties as well as most of the other properties investigated.
In addition, preliminary investigations on H2O2-cleavable boronate esters in the presence of stochiometric amounts of H2O2 are described for three different aryl boronate esters.
For the past 20 years, chronic kidney disease (CKD) has remained one of the major causes of death worldwide. Cardiovascular events account for approximately 50% of deaths in CKD patients, underscoring the clinical relevance of the observed cardiac changes. These changes define uremic cardiomyopathy (UCM) and include left-ventricular hypertrophy (LVH), LV dilatation, and LV systolic and diastolic dysfunction. LVH is seen as the primary manifestation of UCM and is caused by a multitude of different systems including in-creased pre- and afterload and the renin-angiotensin system (RAS). More recent studies found that myocardial dysfunction is apparent before changes in the ventricular geome-try, like hypertrophy, occur to the uremic heart. This leads to the conclusion that LVH is not the cause of cardiac dysfunction, but one of the alterations caused by factors related to the uremic state itself. Among these factors that are independent of pressure and vol-ume overload, are cardiotonic steroids as well as the parathyroid hormone and the endo-thelin (ET-1) system. But we suggest a different substance to play an important role in UCM: Urea. Patients in end-stage renal disease (ESRD) display increased oxidative stress and urea has been found to increase levels of oxidative stress, at least in endothelial cells. Therefore, we investigated the effect that elevated urea levels, as seen in patients undergoing dialysis, have on cardiomyocytes. As the oxidative stress in a cell is regulated by mitochondrial processes, we suspected the mitochondrial orchestrator PGC-1α to play an important role.
The uremic heart is in a state of elevated oxidative stress. This has been presented by multiple authors before. By conducting immunofluorescent staining for reactive oxygen species (ROS), we tried to replicate their findings and illustrate elevated levels of ROS. As the fluorescence analysis did not bear significant results, we approached oxidative stress from a different angle: Via mass spectrometry, we looked at the amino acids methionine, cysteine and betaine which are highly involved in sustaining the oxidative balance in the cell. Our findings in the media of urea-treated HL-1 cells lead us to the conclusion, that these cardiomyocytes were in a state of low antioxidative resources.
Next, to find the intracellular mechanisms that connect uremia to oxidative stress and compromised energetics, we investigated possible downstream effectors of uremia. The urea-treated cardiomyocytes exhibited significant alterations regarding upstream effec-tors of PGC-1α: The protein kinases Akt and Erk were expressed and phosphorylated dif-ferently in a western blot analysis of uremic h9c2 cells and in mice with induced kidney failure. To combine these findings regarding the protein kinases Akt and Erk and oxidative stress, the Erk/p38 pathways seems conclusive (figure 20). This pathway links uremia and oxidative stress to intracellular effectors that have been found to influence the develop-ment of uremic cardiomyopathy.
Another life-threatening alteration in uremic cardiomyopathy is a corrupted cardiac func-tion. The myocardium of uremic patients has shown to be more susceptible to ischemic damage and most patients receiving dialysis experience repeated episodes of intradialytic impairments in cardiac function. The urea-treated cardiomyocytes had a significantly higher oxygen consumption rate due to an inefficiently increased metabolism, most likely caused by an increased level of uncoupling.
Taken together, the results of this study indicate that urea by itself plays a role in the de-velopment of uremic cardiomyopathy. So-called high-physiologic levels of urea have led to a mitochondrial inefficiency and an increase of oxidative stress in cardiomyocytes. The protein kinases Akt and Erk may work as effectors of urea to induce these changes via the Erk/p38 pathway. It seems very likely that the mitochondrial changes are mediated by the mitochondrial orchestrator PGC-1α. These observations might lead to further studies in-vestigating urea levels in dialysis patients. In the future, these might lead to a change of practice regarding tolerated urea levels in dialysis and help reduce the cardiac mortality of patients with chronic kidney disease.
In general, humans preferentially look at conspecifics in naturalistic images. However, such group-based effects might conceal systematic individual differences concerning the preference for social information. Here, we investigated to what degree fixations on social features occur consistently within observers and whether this preference generalizes to other measures of social prioritization in the laboratory as well as the real world. Participants carried out a free viewing task, a relevance taps task that required them to actively select image regions that are crucial for understanding a given scene, and they were asked to freely take photographs outside the laboratory that were later classified regarding their social content. We observed stable individual differences in the fixation and active selection of human heads and faces that were correlated across tasks and partly predicted the social content of self-taken photographs. Such relationship was not observed for human bodies indicating that different social elements need to be dissociated. These findings suggest that idiosyncrasies in the visual exploration and interpretation of social features exist and predict real-world behavior. Future studies should further characterize these preferences and elucidate how they shape perception and interpretation of social contexts in healthy participants and patients with mental disorders that affect social functioning.
Background
Research in the field of surgery is mainly driven by aiming for trauma reduction as well as for personalized treatment concepts. Beyond laparoscopy, other proposed approaches for further reduction of the therapeutic trauma have failed to achieve clinical translation, with few notable exceptions. We believe that this is mainly due to a lack of flexibility and high associated costs. We aimed at addressing these issues by developing a novel minimally invasive operating platform and a preoperative design workflow for patient-individual adaptation and cost-effective rapid manufacturing of surgical manipulators. In this article, we report on the first in-vitro cholecystectomy performed with our operating platform.
Methods
The single-port overtube (SPOT) is a snake-like surgical manipulator for minimally invasive interventions. The system layout is highly flexible and can be adapted in design and dimensions for different kinds of surgery, based on patient- and disease-specific parameters. For collecting and analyzing this data, we developed a graphical user interface, which assists clinicians during the preoperative planning phase. Other major components of our operating platform include an instrument management system and a non-sterile user interface. For the trial surgery, we used a validated phantom which was further equipped with a porcine liver including the gallbladder.
Results
Following our envisioned preoperative design workflow, a suitable geometry of the surgical manipulator was determined for our trial surgery and rapidly manufactured by means of 3D printing. With this setup, we successfully performed a first in-vitro cholecystectomy, which was completed in 78 min.
Conclusions
By conducting the trial surgery, we demonstrated the effectiveness of our PLAFOKON operating platform. While some aspects – especially regarding usability and ergonomics – can be further optimized, the overall performance of the system is highly promising, with sufficient flexibility and strength for conducting the necessary tissue manipulations.
Analysis of the Frequency of Kidney Toxicity in Preclinical Safety Studies using the eTOX Database
(2022)
This research aimed to obtain reliable data on the frequency of different
types of renal toxicity findings in 28-day oral gavage studies in Wistar rats, their
consistency across species and study duration, as well as the correlation between histopathological endpoints and routinely used clinical chemistry parameters indicative of kidney injury. Analysis of renal histopathological findings was
carried out through extraction of information from the IMI eTOX database.
Spontaneous renal histopathological findings in 28-day oral gavage studies in control Wistar rats and beagle dogs confirmed tubular basophilia and renal
dilation as the most frequent incidental findings in controls, whereas necrosis
and glomerulosclerosis were not identified at all or only rarely as a background
lesion.
Histopathological evidence of necrosis and glomerulosclerosis was associated with changes in clinical chemistry parameters in 28-day oral gavage
Wistar rat studies. Necrosis was frequently accompanied by a statistically significant rise in serum creatinine and serum urea, whereas serum albumin was
frequently found to decrease statistically significantly in treatment groups in
which necrosis was recorded. In contrast to necrosis, glomerulosclerosis was
not associated with statistically significant changes in serum creatinine and urea
in any of the 28-day oral gavage Wistar rat treatment groups, but appears to be
best reflected by a pattern of statistically significantly lowered serum albumin
and serum protein together with a statistically significant increase in serum cholesterol. As might have been expected based on the high background incidences
of tubular basophilia and dilation, no consistent changes in any of the clinical
chemistry parameters were evident in animals in which renal lesions were confined to renal tubular basophilia or dilation. In summary, the routinely provided
clinical chemistry parameters are rather insensitive - novel kidney biomarkers
such as Cystatin C, β-trace protein and Kidney injury molecule 1 should further
be evaluated and integrated into routine preclinical and clinical practice. However, evaluation of clinical chemistry data was limited by the lack of individual
animal data. Even though an extensive amount of preclinical studies is accessible
through the eTOX database, comparison of consistency across time was limited
by the limited number of shorter- and longer term studies conducted with the
compounds identified as causing renal histopathological changes within a 28-
day study in rats. A high consistency across time for both treatment-related tubular basophilia and treatment-related dilation cannot be confirmed for either of
the two effects as these two findings were both induced only rarely in studies
over a different treatment-duration other than 28 days after administration of the
compounds which provoked the respective effect in a 28-day study. For the
finding of necrosis consistency across time was low with the exception of
“AZ_GGA_200002321”, in which renal papillary necrosis was identified consistently throughout different treatment durations (2, 4, 26, 104 weeks). No shorter and longer-term studies were available for the compounds identified as causing
glomerulosclerosis within a 28-day study in rats.
No consistent findings of the selected histopathological endpoints were
identified in any of the corresponding 28-day oral gavage beagle dog studies
after treatment with the identical compounds, which caused the respective effect after 28-day treatment in rats. However, in the overwhelming majority of
cases, beagle dogs were administered lower doses in these studies in comparison to the corresponding 28-day Wistar rat studies.
Searching the eTOX database yielded no 28-day oral gavage studies in
Wistar and Wistar Han rats in which accumulation of hyaline droplets, tubular
atrophy or hyperplasia was recorded. Only one 28-day oral gavage Wistar rat
study was identified with the histopathological result of neutrophilic inflammation. Consequently, evaluation of these four renal findings in relation to clinical
chemistry parameters and consistency across time and species cannot be
made.
In summary, this work contributes knowledge through mining and evaluating the eTOX database on a variety of specific renal endpoints that frequently
occur after administration of trial substances in 28-day oral gavage studies in
Wistar rats in the field of preclinical toxicity with specific focus on their frequency relation to background findings, as well as consistency across time and species. Targeted statistical evaluation of in vivo data within joint research ventures
such as the eTOX project, presents an enormous opportunity for an innovative
future way of aiding preclinical research towards a more efficient research in the
preclinical stage of drug development. This could be achieved through the augmentation of methodological strategies and possibly novel software tools in order to predict in vivo toxicology of new molecular entities by means of information that is already available before early stages of the drug development
pipeline begin.
In this Doctoral Thesis we investigated the consequences of perturbed mitochondrial calcium handling in the context of a rare human disease, Barth syndrome, in which the altered phospholipid composition of the inner mitochondrial membrane affects the structural organization of several protein complexes, including the mitochondrial calcium uniporter. We discovered that loss of the mitochondrial calcium uniporter in cardiac, but not skeletal muscle mitochondria hinders the calcium-induced adaptation of mitochondrial oxidative metabolism during workload transitions. This mechano-energetic uncoupling impairs the physiological increase in contractile force during physical exercise and might predispose Barth syndrome patients to the development of arrhythmias.
In early 2022, the Coronavirus disease 2019 (COVID-19) remains a global challenge. COVID-19 is caused by an increasing number of variants of the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). Here, we report an outbreak of SARS-CoV-2 breakthrough infections related to a student festive event with 100 mostly vaccinated guests, which took place in Northern Bavaria, Germany, in October 2021. The data were obtained by retrospective guest interviews. In total, 95 students participated in the study, with 94 being fully vaccinated and 24 reporting infection by the delta variant. Correlation analyses among 15 examined variables revealed that time spent at the event, conversation with the supposed index person, and a homologous viral vector vaccination regime were significant risk factors for infection. Non-significant observations related to higher rates of infection included time since last vaccination, shared use of drinking vessels, and number of individual person-to-person contacts at the event. Our data suggest that a high rate of breakthrough infections with the delta variant occurs if no preventive measures are practiced. To limit infection risk, high-quality testing of participants should be considered a mandatory measure at gatherings, irrespective of the participants' vaccination status.
In this study, we aimed to understand how restaurants can contribute to climate change mitigation via menu design. We investigated two types of interventions: changing the configuration of menu entries with variable side dishes so that the most climate-friendly option is set as the default and indicating the greenhouse gas emission of each dish via carbon labels. In an online simulation experiment, 265 participants were shown the menus of nine different restaurants and had to choose exactly one dish per menu. In six menus, the main dishes were presented with different default options: the side dish was associated either with the highest or with the lowest greenhouse gas emissions. The other three menus consisted of unitary dishes for which the default rules did not apply. All menus were presented either with or without carbon labels for each dish option. The results indicated that more climate-friendly dish choices resulting in lower greenhouse gas emissions were made with the low-emission than the high-emission default condition, and when carbon labels were present rather than absent. The effects of both interventions interacted, which indicates that the interventions partly overlap with regard to cognitive predecessors of choice behavior, such as attentional focus and social norms. The results suggest that the design of restaurant menus has a considerable effect on the carbon footprint of dining.
Kavitäts-Exziton-Polaritonen (Polaritonen) sind hybride Quasiteilchen, die sich aufgrund starker Kopplung von Halbleiter-Exzitonen mit Kavitätsphotonen ausbilden. Diese Quasiteilchen weisen eine Reihe interessanter Eigenschaften auf, was sie einerseits für die Grundlagenforschung, andererseits auch für die Entwicklung neuartiger Bauteile sehr vielversprechend macht. Bei Erreichen einer ausreichend großen Teilchendichte geht das System in den Exziton-Polariton-Kondensationszustand über, was zur Emission von laserartigem Licht führt. Organische Halbleiter als aktives Emittermaterial zeigen in diesem Kontext großes Potential, da deren Exzitonen neben großen Oszillatorstärken auch hohe Bindungsenergien aufweisen. Deshalb ist es möglich, unter Verwendung organischer Halbleiter selbst bei Umgebungsbedingungen äußerst stabile Polaritonen zu erzeugen. Eine wichtige Voraussetzung zur Umsetzung von integrierten opto-elektronischen Bauteilen basierend auf Polaritonen ist der kontrollierte räumliche Einschluss sowie die Realisierung von frei konfigurierbaren Potentiallandschaften. Diese Arbeit beschäftigt sich mit der Entwicklung und der Untersuchung geeigneter Plattformen zur Erzeugung von Exziton-Polaritonen und Polaritonkondensaten in hemisphärischen Mikrokavitäten, in die organische Halbleiter eingebettet sind.
We analyze a variety of integration schemes for the momentum space functional renormalization group calculation with the goal of finding an optimized scheme. Using the square lattice t-t' Hubbard model as a testbed we define and benchmark the quality. Most notably we define an error estimate of the solution for the ordinary differential equation circumventing the issues introduced by the divergences at the end of the FRG flow. Using this measure to control for accuracy we find a threefold reduction in number of required integration steps achievable by choice of integrator. We herewith publish a set of recommended choices for the functional renormalization group, shown to decrease the computational cost for FRG calculations and representing a valuable basis for further investigations.
Mitochondria are central organelles in the homeostasis of the cardiovascular system via the integration of several physiological processes, such as ATP generation via oxidative phosphorylation, synthesis/exchange of metabolites, calcium sequestration, reactive oxygen species (ROS) production/buffering and control of cellular survival/death. Mitochondrial impairment has been widely recognized as a central pathomechanism of almost all cardiovascular diseases, rendering these organelles important therapeutic targets. Mitochondrial dysfunction has been reported to occur in the setting of drug-induced toxicity in several tissues and organs, including the heart. Members of the drug classes currently used in the therapeutics of cardiovascular pathologies have been reported to both support and undermine mitochondrial function. For the latter case, mitochondrial toxicity is the consequence of drug interference (direct or off-target effects) with mitochondrial respiration/energy conversion, DNA replication, ROS production and detoxification, cell death signaling and mitochondrial dynamics. The present narrative review aims to summarize the beneficial and deleterious mitochondrial effects of common cardiovascular medications as described in various experimental models and identify those for which evidence for both types of effects is available in the literature.
During ischemic stroke, infarct growth before recanalization diminishes functional outcome. Hence, adjunct treatment options to protect the ischemic penumbra before recanalization are eagerly awaited. In experimental stroke targeting two different pathways conferred protection from penumbral tissue loss: (1) enhancement of hypoxic tolerance of neurons by deletion of the calcium channel subunit Orai2 and (2) blocking of detrimental lymphocyte–platelet responses. However, until now, no preclinical stroke study has assessed the potential of combining neuroprotective with anti-thrombo-inflammatory interventions to augment therapeutic effects. We induced focal cerebral ischemia in Orai2-deficient (Orai2\(^{-/-}\)) mice by middle cerebral artery occlusion (MCAO). Animals were treated with anti-glycoprotein Ib alpha (GPIbα) Fab fragments (p0p/B Fab) blocking GPIbα–von Willebrand factor (vWF) interactions. Rat immunoglobulin G (IgG) Fab was used as the control treatment. The extent of infarct growth before recanalization was assessed at 4 h after MCAO. Moreover, infarct volumes were determined 6 h after recanalization (occlusion time: 4 h). Orai2 deficiency significantly halted cerebral infarct progression under occlusion. Inhibition of platelet GPIbα further reduced primary infarct growth in Orai2\(^{-/-}\) mice. During ischemia–reperfusion, upon recanalization, mice were likewise protected. All in all, we show that neuroprotection in Orai2\(^{-/-}\) mice can be augmented by targeting thrombo-inflammation. This supports the clinical development of combined neuroprotective/anti-platelet strategies in hyper-acute stroke.
Angiopoetin-like 4 (ANGPTL-4) ist ein Adipokin, das in der extrazellulären Matrix lokalisiert ist und das neben seinen Aufgaben im Fettstoffwechsel auch die Zellmigration, Zellinvasion und die Angioneogenese reguliert. Da es zusätzlich auch den Knochenabbau fördert, wirkt es als Tumorpromotor speziell für Knochentumore. Aufgrund der gesteigerten Expression in Tumorgewebe ist es potenzielles Ziel für molekulare Bildgebung. Mittels Expressionsanalysen auf mRNA- und Proteinebene sollte ein besseres Verständnis der Regulation von ANGPTL-4 erreicht werden. Dexamethason und die 9-cis-Retinsäure beeinflussten die Expression von ANGPTL-4 in MDA Zellen im positiven Sinne, wohingegen der Adenylatcyclase Aktivator Forskolin die Expression supprimierte. In MCF-7 Zellen wurde ANGPTL-4 durch den Phorbolester PMA und durch den Epidermalen Wachstumsfaktor (EGF) induziert. Eine Modulation von ANGPTL-4 könnte von klinischem Nutzen sein, speziell bei der Behandlung von Knochentumoren. Zusätzlich könnte die Trennschärfe von molekularen bildgebenden Verfahren gesteigert werden.
Transforming growth factor β (TGFβ) signaling has manifold functions such as regulation of cell growth, differentiation, migration, and apoptosis. Moreover, there is increasing evidence that it also acts in a neuroprotective manner. We recently showed that TGFβ receptor type 2 (Tgfbr2) is upregulated in retinal neurons and Müller cells during retinal degeneration. In this study we investigated if this upregulation of TGFβ signaling would have functional consequences in protecting retinal neurons. To this end, we analyzed the impact of TGFβ signaling on photoreceptor viability using mice with cell type-specific deletion of Tgfbr2 in retinal neurons and Müller cells (Tgfbr2\(_{ΔOC}\)) in combination with a genetic model of photoreceptor degeneration (VPP). We examined retinal morphology and the degree of photoreceptor degeneration, as well as alterations of the retinal transcriptome. In summary, retinal morphology was not altered due to TGFβ signaling deficiency. In contrast, VPP-induced photoreceptor degeneration was drastically exacerbated in double mutant mice (Tgfbr2\(_{ΔOC}\); VPP) by induction of pro-apoptotic genes and dysregulation of the MAP kinase pathway. Therefore, TGFβ signaling in retinal neurons and Müller cells exhibits a neuroprotective effect and might pose promising therapeutic options to attenuate photoreceptor degeneration in humans.
Atomically thin semiconductors from the transition metal dichalcogenide family are materials in which the optical response is dominated by strongly bound excitonic complexes. Here, we present a theory of excitons in two-dimensional semiconductors using a tight-binding model of the electronic structure. In the first part, we review extensive literature on 2D van der Waals materials, with particular focus on their optical response from both experimental and theoretical points of view. In the second part, we discuss our ab initio calculations of the electronic structure of MoS\(_2\), representative of a wide class of materials, and review our minimal tight-binding model, which reproduces low-energy physics around the Fermi level and, at the same time, allows for the understanding of their electronic structure. Next, we describe how electron-hole pair excitations from the mean-field-level ground state are constructed. The electron–electron interactions mix the electron-hole pair excitations, resulting in excitonic wave functions and energies obtained by solving the Bethe–Salpeter equation. This is enabled by the efficient computation of the Coulomb matrix elements optimized for two-dimensional crystals. Next, we discuss non-local screening in various geometries usually used in experiments. We conclude with a discussion of the fine structure and excited excitonic spectra. In particular, we discuss the effect of band nesting on the exciton fine structure; Coulomb interactions; and the topology of the wave functions, screening and dielectric environment. Finally, we follow by adding another layer and discuss excitons in heterostructures built from two-dimensional semiconductors.
The progressive motor neuropathy (PMN) mouse is a model of an inherited motor neuropathy disease with progressive neurodegeneration. Axon degeneration associates with homozygous mutations of the TBCE gene encoding the tubulin chaperone E protein. TBCE is responsible for the correct dimerization of alpha and beta-tubulin. Strikingly, the PMN mouse also develops a progressive hearing loss after normal hearing onset, characterized by degeneration of the auditory nerve and outer hair cell (OHC) loss. However, the development of this neuronal and cochlear pathology is not fully understood yet. Previous studies with pegylated insulin-like growth factor 1 (peg-IGF-1) treatment in this mouse model have been shown to expand lifespan, weight, muscle strength, and motor coordination. Accordingly, peg-IGF-1 was evaluated for an otoprotective effect. We investigated the effect of peg-IGF-1 on the auditory system by treatment starting at postnatal day 15 (p15). Histological analysis revealed positive effects on OHC synapses of medial olivocochlear (MOC) neuronal fibers and a short-term attenuation of OHC loss. Peg-IGF-1 was able to conditionally restore the disorganization of OHC synapses and maintain the provision of cholinergic acetyltransferase in presynapses. To assess auditory function, frequency-specific auditory brainstem responses and distortion product otoacoustic emissions were recorded in animals on p21 and p28. However, despite the positive effect on MOC fibers and OHC, no restoration of hearing could be achieved. The present work demonstrates that the synaptic pathology of efferent MOC fibers in PMN mice represents a particular form of “efferent auditory neuropathy.” Peg-IGF-1 showed an otoprotective effect by preventing the degeneration of OHCs and efferent synapses. However, enhanced efforts are needed to optimize the treatment to obtain detectable improvements in hearing performances.
Im Rahmen der vorliegenden Arbeit wurden vier Verbindungsklassen – Borylene, Borole, 9-Borafluorene und 9-Aluminafluorene – untersucht und neue Vertreter dieser Klassen, substituiert mit einem ortho-Dicarba-closo-dodecaboran, dargestellt und auf ihre Reaktivität hin untersucht. Dabei sollte mit den speziellen chemischen Eigenschaften des Carboranylsubstituenten, wie dem elektronenziehenden und gleichzeitig σ-aromatischen Charakter, eine erhöhte Reaktivität der Zielverbindung erreicht werden.
Recent analyses conducted by German official food control reported detection of the aromatic amides N-(2,4-dimethylphenyl)acetamide (NDPA), N-acetoacetyl-m-xylidine (NAAX) and 3-hydroxy-2-naphthanilide (Naphthol AS) in cold water extracts from certain food contact materials made from paper or cardboard, including paper straws, paper napkins, and cupcake liners. Because aromatic amides may be cleaved to potentially genotoxic primary amines upon oral intake, these findings raise concern that transfer of NDPA, NAAX and Naphthol AS from food contact materials into food may present a risk to human health. The aim of the present work was to assess the stability of NDPA, NAAX and Naphthol AS and potential cleavage to 2,4-dimethylaniline (2,4-DMA) and aniline during simulated passage through the gastrointestinal tract using static in vitro digestion models. Using the digestion model established by the National Institute for Public Health and the Environment (RIVM, Bilthoven, NL) and a protocol recommended by the European Food Safety Authority, potential hydrolysis of the aromatic amides to the respective aromatic amines was assessed by LC–MS/MS following incubation of the aromatic amides with digestive fluid simulants. Time-dependent hydrolysis of NDPA and NAAX resulting in formation of the primary aromatic amine 2,4-DMA was consistently observed in both models. The highest rate of cleavage of NDPA and NAAX was recorded following 4 h incubation with 0.07 M HCl as gastric-juice simulant, and amounted to 0.21% and 0.053%, respectively. Incubation of Naphthol AS with digestive fluid simulants did not give rise to an increase in the concentration of aniline above the background that resulted from the presence of aniline as an impurity of the test compound. Considering the lack of evidence for aniline formation from Naphthol AS and the extremely low rate of hydrolysis of the amide bonds of NDPA and NAAX during simulated passage through the gastrointestinal tract that gives rise to only very minor amounts of the potentially mutagenic and/or carcinogenic aromatic amine 2,4-DMA, risk assessment based on assumption of 100% cleavage to the primary aromatic amines would appear to overestimate health risks related to the presence of aromatic amides in food contact materials.
Despite considerable morbidity and mortality, numerous cases of endocrine hypertension (EHT) forms, including primary aldosteronism (PA), pheochromocytoma and functional paraganglioma (PPGL), and Cushing’s syndrome (CS), remain undetected. We aimed to establish signatures for the different forms of EHT, investigate potentially confounding effects and establish unbiased disease biomarkers. Plasma samples were obtained from 13 biobanks across seven countries and analyzed using untargeted NMR metabolomics. We compared unstratified samples of 106 PHT patients to 231 EHT patients, including 104 PA, 94 PPGL and 33 CS patients. Spectra were subjected to a multivariate statistical comparison of PHT to EHT forms and the associated signatures were obtained. Three approaches were applied to investigate and correct confounding effects. Though we found signatures that could separate PHT from EHT forms, there were also key similarities with the signatures of sample center of origin and sample age. The study design restricted the applicability of the corrections employed. With the samples that were available, no biomarkers for PHT vs. EHT could be identified. The complexity of the confounding effects, evidenced by their robustness to correction approaches, highlighted the need for a consensus on how to deal with variabilities probably attributed to preanalytical factors in retrospective, multicenter metabolomics studies.
Routine coronal paraffin-sections through the dorsal frontal and parieto-occipital cortex of a total of sixty cases with divergent causes of death were immunohistochemically (IHC) stained with an antibody against TMEM119. Samples of cerebrospinal fluid (CSF) of the same cases were collected by suboccipital needle-puncture, subjected to centrifugation and processed as cytospin preparations stained with TMEM119. Both, cytospin preparations and sections were subjected to computer-assisted density measurements. The density of microglial TMEM119-positive cortical profiles correlated with that of cytospin results and with the density of TMEM119-positive microglial profiles in the medullary layer. There was no statistically significant correlation between the density of medullary TMEM119-positive profiles and the cytospin data. Cortical microglial cells were primarily encountered in supragranular layers I, II, and IIIa and in infragranular layers V and VI, the region of U-fibers and in circumscribed foci or spread in a diffuse manner and high density over the white matter. We have evidence that cortical microglia directly migrate into CSF without using the glympathic pathway. Microglia in the medullary layer shows a strong affinity to the adventitia of deep vessels in the myelin layer. Selected rapidly fatal cases including myocardial infarcts and drowning let us conclude that microglia in cortex and myelin layer can react rapidly and its reaction and migration is subject to pre-existing external and internal factors. Cytospin preparations proved to be a simple tool to analyze and assess complex changes in the CNS after rapid fatal damage. There is no statistically significant correlation between cytospin and postmortem interval. Therefore, the quantitative analyses of postmortem cytospins obviously reflect the neuropathology of the complete central nervous system. Cytospins provide forensic pathologists a rather simple and easy to perform method for the global assessment of CNS affliction.
Bei einem ischämischen Schlaganfall bestehen neben dem Verlust von neuronalen Zellen auch dysfunktionale Signale, die sich pathologisch auf die tieferen motorischen Zentren des zentralen Nervensystems auswirken können. Mittels tiefer Hirnstimulation kann die Weiterleitung pathologischer Signale im Bereich des neuronalen Netzwerks unterbrochen werden. In dieser Arbeit wurde ein Tiermodell verwendet, in welchem bei insgesamt 18 Ratten ein photothrombotischer Schlaganfall des rechten sensomotorischen Kortex induziert wurde. Nachdem bei jedem Tier eine Mikroelektrode in den Bereich des pedunkulopontinen tegmentalen Nucleus implantiert worden war, wurde eine kontinuierliche tiefe Hirnstimulation über 10 Tage durchgeführt. Die Gegenüberstellung der Fall- und Kontrollgruppe im Beam-Walking- und Ladder-Rung-Walking-Test ergab hierbei keine Verbesserung der motorischen Defizite durch die Intervention. Das Ergebnis lässt sich vor dem Hintergrund neuerer Erkenntnisse einordnen, nach welchen der pedunkulopontine tegmentale Nucleus nicht für die Bewegungsinitiierung verantwortlich ist.
A series of donor-acceptor macrocyclic architectures comprising oligothiophene strands that connect the imide positions of a perylene bisimide have been synthesized via a platinum-mediated cross-coupling strategy. The target structures were characterized by steady-state UV/Vis absorption, fluorescence and transient absorption spectroscopy, as well as cyclic and differential pulse voltammetry. Crystal structure analysis of the macrocycles revealed insights into the bridge arrangements. The properties of the macrocyclic bridges were compared to linear oligothiophene reference compounds which itself exhibited an unusual electrochemical effect.
Two macrocyclic architectures comprising oligothiophene strands that connect the imide positions of a perylene bisimide (PBI) dye have been synthesized via a platinum-mediated cross-coupling strategy. The crystal structure of the double bridged PBI reveals all syn-arranged thiophene units that completely enclose the planar PBI chromophore via a 12-membered macrocycle. The target structures were characterized by steady-state UV/Vis absorption, fluorescence and transient absorption spectroscopy, as well as cyclic and differential pulse voltammetry. Both donor–acceptor dyads show ultrafast Förster Resonance Energy Transfer and photoinduced electron transfer, thereby leading to extremely low fluorescence quantum yields even in the lowest polarity cyclohexane solvent.
Macrocyclic Donor‐Acceptor Dyads Composed of Oligothiophene Half‐Cycles and Perylene Bisimides
(2022)
A series of donor‐acceptor (D−A) macrocyclic dyads consisting of an electron‐poor perylene bisimide (PBI) π‐scaffold bridged with electron‐rich α‐oligothiophenes bearing four, five, six and seven thiophene units between the two phenyl‐imide substituents has been synthesized and characterized by steady‐state UV/Vis absorption and fluorescence spectroscopy, cyclic and differential pulse voltammetry as well as transient absorption spectroscopy. Tying the oligothiophene strands in a conformationally fixed macrocyclic arrangement leads to a more rigid π‐scaffold with vibronic fine structure in the respective absorption spectra. Electrochemical analysis disclosed charged state properties in solution which are strongly dependent on the degree of rigidification within the individual macrocycle. Investigation of the excited state dynamics revealed an oligothiophene bridge size‐dependent fast charge transfer process for the macrocyclic dyads upon PBI subunit excitation.
(1) Background: The aim of this study is to assess perioperative therapy in stage IA-III pancreatic cancer cross-validating the German Cancer Registry Group of the Society of German Tumor Centers — Network for Care, Quality, and Research in Oncology, Berlin (GCRG/ADT) and the National Cancer Database (NCDB). (2) Methods: Patients with clinical stage IA-III PDAC undergoing surgery alone (OP), neoadjuvant therapy (TX) + surgery (neo + OP), surgery+adjuvantTX (OP + adj) and neoadjuvantTX + surgery + adjuvantTX (neo + OP + adj) were identified. Baseline characteristics, histopathological parameters, and overall survival (OS) were evaluated. (3) Results: 1392 patients from the GCRG/ADT and 29,081 patients from the NCDB were included. Patient selection and strategies of perioperative therapy remained consistent across the registries for stage IA-III pancreatic cancer. Combined neo + OP + adj was associated with prolonged OS as compared to neo + OP alone (17.8 m vs. 21.3 m, p = 0.012) across all stages in the GCRG/ADT registry. Similarly, OS with neo + OP + adj was improved as compared to neo + OP in the NCDB registry (26.4 m vs. 35.4 m, p < 0.001). (4) Conclusion: The cross-validation study demonstrated similar concepts and patient selection criteria of perioperative therapy across clinical stages of PDAC. Neoadjuvant therapy combined with adjuvant therapy is associated with improved overall survival as compared to either therapy alone.