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The impact of salps(Salpa thompsoni)on the Antarctic krill population(Euphausia superba):an individual-based modelling study

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Ecological Processes 2023年第1期12卷 680-695页

作者： Bruno Walter Pietzsch Aaron Schmidt Jürgen Groeneveld Dominik Bahlburg Bettina Meyer uta berger Faculty of Environmental Sciences Institute of Forest Growth and Forest Computer SciencesTechnische Universität Dresden01062 DresdenGermany Department of Ecological Modelling Helmholtz Centre for Environmental Research-UFZLeipzigGermany Section Polar Biological Oceanography Alfred Wegener Institute Helmholtz Centre for Polar and Marine ResearchBremerhavenGermany Institute for Chemistry and Biology of the Marine Environment(ICBM) Carl-Von-Ossietzky UniversityOldenburgGermany Helmholtz Institute for Marine Functional Biodiversity(HIFMB) OldenburgGermany

Background Krill(Euphausia superba)and salps(Salpa thompsoni)are key macrozooplankton grazers in the Southern Ocean ***,due to differing habitat requirements,both species previously exhibited little spatial *** ongoing climate change-induced seawater temperature increase and regional sea ice loss,salps can now extend their spatial distribution into historically krill-dominated areas and increase rapidly due to asexual reproduction when environmental conditions are *** the potential effects on krill is crucial,since krill is a species of exceptional trophic significance in the Southern Ocean food *** impacts on krill could trigger cascading effects on its predators and *** address this question,we combined two individual-based models on salps and krill,which describe the whole life cycle of salp individuals and the dynamic energy budget of individual *** resulting new model PEKRIS(PErformance of KRIll ***)simulates a krill population for 100 years under varying chlorophyll-a concentrations in the presence or absence of *** All of the investigated krill population properties(abundance,mean length,and yearly egg production)were significantly impacted by the presence of *** the other hand,salp density was not impacted if krill were *** medians of krill population properties deviated during variable maximum chlorophyll-a density per year when salps were introduced by−99.9%(−234 individuals per 1000 m3)for krill density,−100%(−22,062 eggs per 1000 m3)for krill eggs and−0.9%(−0.3 mm)for mean length of *** If both species compete for the same food resource in a closed space,salps seem to inhibit krill *** simulation studies should investigate whether this effect prevails if different phytoplankton sizes and consumption preferences of krill are ***,direct predation of the two species or consumption of krill fecal pellets by salps could c

关键词： Euphausia superba Salpa thompsoni Individual-based model Food competition Population dynamics DEB theory

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Haemorrhage after thrombectomy with adjuvant thrombolysis in unknown onset stroke depends on high early lesion water uptake

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Stroke & Vascular Neurology 2024年第4期9卷 390-398页

作者： Gabriel Broocks Lukas Meyer uta Hanning Tobias Djamsched Faizy Matthias Bechstein Helge Kniep Noel Van Horn Gerhard Schön Ewgenia Barow Götz Thomalla Jens Fiehler Andre Kemmling Department of Diagnostic and Interventional Neuroradiology University Medical Center Hamburg-EppendorfHamburgGermany Department of Medical Biometry and Epidemiology University Medical Center Hamburg EppendorfHamburgGermany Department of Neurology University Medical Center Hamburg-EppendorfHamburgGermany Department of Neuroradiology University MarburgMarburgGermany

Background and purpose In wake-up stroke,CT-based quantitative net water uptake(NWU)might serve as an alternative tool to MRI to guide intravenous thrombolysis with alteplase(IVT).An important complication after IVT is symptomatic intracerebral haemorrhage(sICH).As NWU directly implies ischaemic lesion progression,reflecting blood-brain barrier injury,we hypothesised that NWU predicts sICH in patients who had a ischaemic stroke undergoing thrombectomy with unknown *** Consecutive analysis of all patients who had unknown onset anterior circulation ischaemic stroke who underwent CT at baseline and endovascular treatment between December 2016 and October *** NWU was assessed on baseline *** primary endpoint was *** association of NWU and other baseline parameters to sICH was investigated using inverse-probability weighting(IPW)*** A total of 88 patients were included,of which 46 patients(52.3%)received *** median NWU was 10.7%(IQR:5.1–17.7).The proportion of patients with any haemorrhage and sICH were 35.2%and 13.6%.NWU at baseline was significantly higher in patients with sICH(19.1%vs 9.6%,p<0.0001)and the median Alberta Stroke Program Early CT Score(ASPECTS)was lower(5 vs 8,p<0.0001).Following IPW,there was no association between IVT and sICH in unadjusted ***,after adjusting for ASPECTS and NWU,there was a significant association between IVT administration and sICH(14.6%,95%CI:3.3%to 25.6%,p<0.01).Conclusion In patients with ischaemic stroke with unknown onset,the combination of high NWU with IVT is directly linked to higher rates of *** ASPECTS for evaluating the extent of the early infarct lesion,quantitative NWU could be used as an imaging biomarker to assess the degree of blood-brain barrier damage in order to predict the risk of sICH in patients with wake up stroke.

关键词： throm thrombolysis high

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Expressionism Norbert Wolf ; uta Grosenick (ed.).

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作者： (1949-)Wolf Norbert Grosenick uta.

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World Journal of Gastrointestinal Oncology 2020年第11期12卷 1288-1295页

作者： Anne Katrin berger Michael Allgäuer Leonidas Apostolidis Anna Elisa Schulze-Schleithoff uta Merle Dirk Jaeger Georg Martin Haag Department of Medical Oncology National Center for Tumor DiseasesUniversity Hospital of HeidelbergHeidelberg 69120Germany Department of Pathology Institute of PathologyUniversity Hospital of HeidelbergHeidelberg 69120Germany Department of Gastroenterology University Hospital of HeidelbergHeidelberg 69120Germany Department of Gastroenterology and Hepatology University Hospital of HeidelbergHeidelberg 69120Germany

BACKGROUND Microangiopathic hemolytic anemia(MAHA) with thrombocytopenia and organ failure caused by tumor-associated thrombotic microangiopathy(TMA) is a lifethreatening oncological emergency. Rapid diagnosis and precise distinction from other forms of TMA is crucial for appropriate therapy, which aims at treating the underlying malignancy. However, the prognosis of patients with cancer-related(CR)-MAHA is limited. To date, less than 50 patients with gastric cancer and CRMAHA have been reported, mainly as single case reports, and detailed information on treatment strategies and outcome are scarce. We analyzed the characteristics and outcomes data of CR-MAHA patients with gastric cancer treated at our center between 2012 and *** To gain knowledge about CR-MAHA and the course of *** We retrospectively analyzed patients using an institutional prospectively maintained database. Patients who had CR-MAHA but other cancer types or cancer of unknown primary were excluded. The basic requirements for inclusion were: Histologically proven gastric adenocarcinoma;and clinical diagnosis of hemolytic anemia with schistocytes with or without thrombocytopenia. The observation period for each patient started with the first day of documented symptoms. The follow-up period for this analysis ended on February 1, *** We identified eight patients with a median age of 54 years. Histologically, all patients had(partial) diffuse subtypes of gastric adenocarcinoma with partial or complete signet cell morphology. All patients had metastatic disease and one patient had a microsatellite instability-high(MSI-H) tumor. In three patients, clinical signs of MAHA preceded the diagnosis of cancer, and in two patients, CRMAHA indicated recurrent disease. All patients had severe hemolytic anemia and thrombocytopenia. Six patients experienced severe bone pain, and five patients had dyspnea. Systemic, 5-fluorouracil-based combination chemotherapy was initiated in six patients, w

关键词： Microangiopathic hemolytic anemia Gastric cancer Chemotherapy Secondline chemotherapy Thrombocytopenia Microsatellite instability-high tumor

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Spatiality of the urban commons:Typo-morphology of the open common spaces in New Belgrade mass housing blocks

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Frontiers of Architectural Research 2023年第3期12卷 444-457页

作者： Anica Dragutinovic Wido Quist uta Pottgiesser Faculty of Architecture and the Built Environment Delft University of TechnologyDelft 2628 BLthe Netherlands Institute for Design Strategies Technische Hochschule OWL32756 DetmoldGermany

The article examines the existing infrastructure of open common spaces within two New Belgrade mass housing blocks(Blocks 23 and 70a)through a typo-morphological *** spaces between the buildings,although the most neglected,underused,and deteriorated components of mass housing neighbourhoods,are at the same time crucial to the quality,vitality and integrated governance of these *** represent the primary tangible commons in cities and *** question of urban commons is increasingly present in scientific literature,urban and architectural ***,approaches exploring the spatiality of the urban commons are scarce,leading to insufficient understanding of the spatial aspect and potentials of the already existing ***,this study includes(1)identification,typological decoding and classification of the common spaces,focusing on the case of New Belgrade blocks,followed by(2)analysis of the spatial patterns and integration of the identified spaces within the *** study confirms the complexity and diverse typology of the common *** finds that the in-between,common spaces contribute to higher integration of different segments of the *** open common spaces have an essential role in humanisation of the blocks,and thus the quality of life in the blocks as integrated *** findings indicate that the spatial setting of the open common spaces in New Belgrade blocks allows for(re)emergence of collective practices,leading to inclusive and integrated rehabilitation of the neighbourhoods.

关键词： Common spaces Mass housing Spatial patterns Analytical framework Typo-morphology

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Non-alcoholic fatty liver disease and COVID-19: Harmless companions or disease intensifier?

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World Journal of Gastroenterology 2023年第2期29卷 367-377页

作者： Christoph G Dietrich Andreas Geier uta Merle Gastro-Praxis Wiesbaden Leberzentrum WiesbadenWiesbaden 65189Germany Division of Hepatology Department of Medicine IIUniversity Hospital WuerzburgWuerzburg 97080Germany Department of Gastroenterology and Hepatology University Hospital HeidelbergHeidelberg 69120Germany

The pandemics of coronavirus disease 2019(COVID-19)and non-alcoholic fatty liver disease(NAFLD)*** liver function tests are frequent in COVID-19 and may influence liver damage in NAFLD,while preexisting liver damage from NAFLD may influence the course of ***,the prognostic relevance of this interaction,though,is *** is a risk factor for the presence of NAFLD as well as a severe course of *** studies reveal conflicting results regarding the influence of NAFLD presence on COVID-19 illness *** molecular similarities of cytokine pathways in both diseases,including postacute sequelae of COVID-19,suggest common pathways for chronic low-activity *** review will summarize existing data regarding the interaction of both diseases and discuss possible mechanisms of the influence of one disease on the other.

关键词： COVID-19 Postacute sequelae of COVID-19 Non-alcoholic fatty liver disease Non-alcoholic steatohepatitis Inflammation Fatty liver

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Destabilization of acrosome and elastase influence mediate the release of secretory phospholipase A2 from human spermatozoa

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Asian Journal of Andrology 2008年第6期10卷 829-836页

作者： Jacqueline Leβig uta Reibetanz Jiirgen Arnhold Hans-Jtirgen Glander Institute for Medical Physics and Biophysics Medical Faculty University of Leipzig Leipzig D-04107 Germany Department of Dermatology/Andrological Training Centre of the European Academy of Andrology University of Leipzig Leipzig D-04103 Germany

Aim： To determine the cellular distribution of secretory phospholipase A2 （sPLA2） in dependence on the acrosomal state and under the action of elastase released under inflammatory processes from leukocytes. Methods： Acrosome reaction of spermatozoa was triggered by calcimycin. Human leukocyte elastase was used to simulate inflammatory conditions. To visualize the distribution of sPLA2 and to determine the acrosomal state, immunofluorescence techniques and lectin binding combined with confocal laser scanning fluorescence microscopy and flow cytometry were used. Results： Although sPLA2 was detected at the acrosome and tail regions in intact spermatozoa, it disappeared from the head region after triggering the acrosome reaction. This release of sPLA2 was associated with enhanced binding of annexin V-fluoroscein isothiocyanate （FITC） to spermatozoa surfaces, intercalation of ethidium-homodimer I, and binding of FITC-labelled concanavalin A at the acrosomal region. Spermatozoa from healthy subjects treated with elastase were characterized by release of sPLA2, disturbance of acrosome structure, and loss of vitality. Conclusion： The ability of spermatozoa to release secretory phospholipase A2 is related to the acrosomal state. Premature destabi- lization of the acrosome and loss of sPLA2 can occur during silent inflammations in the male genital tract. The distribution pattern of sPLA2 in intact spermatozoa might be an additional parameter for evaluating sperm quality.

关键词： acrosome reaction elastase human spermatozoa inflammation secretory phospholipase A2

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Laser additive manufactured high-performance Fe-based composites with unique strengthening structure

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Journal of Materials Science & Technology 2021年第30期89卷 242-252页

作者： Hongyu Chen Dongdong Gu Liang Deng Tiwen Lu uta Kühn Konrad Kosiba College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components Nanjing University of Aeronautics and AstronauticsNanjing 210016China Leibniz IFW Dresden Institute for Complex MaterialsP.O.Box 270116D-01069 DresdenGermany

Steel matrix composites(SMCs),reinforced by ceramic particles,have received a consistent attention in recent *** conventional methods to prepare SMCs is generally challenging,and the mechanical properties of conventionally fabricated SMCs are *** this study,we successfully fabricated highperformance SMCs by laser powder bed fusion(LPBF)of a composite powder consisting of Fe-based alloy powder and submicron-sized WC *** effect of laser energy density on the phase formation,microstructural evolution,overall density and resulting mechanical properties of LPBF-fabricated composites was *** present results show that a novel Fe_(2)W_(4)C carbidic network precipitates in the solidified microstructure entailing segregations along the boundaries of cellular *** presence of this carbidic network hampers the growth of sub-grains even at elevated temperatures,and hence,stabilizes the grain size though prepared at a broad range of different energy *** exact distribution of the Fe_(2)W_(4)C carbides depends on the employed laser energy densities,as for instance they are more uniformly distributed at higher energy *** density of LPBF samples reaches the maximum value of 99.4%at 150 J/mm^(3).In this parameter set,high microhardness of~753 HV,compression strength of~3350 MPa and fracture strain of~24.4%are *** enhanced mechanical properties are ascribed to less metallurgical defects,higher volume fraction of the martensitic phase and increasing pile-up dislocations resulting from the pinning effect by Fe_(2)W_(4)C carbide.

关键词： Laser additive manufacturing Laser powder bed fusion Steel matrix composite Microstructures Mechanical properties

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Diagnostic criteria for acute liver failure due to Wilson disease

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World Journal of Gastroenterology 2007年第11期13卷 1711-1714页

作者： Christoph Eisenbach Olivia Sieg Wolfgang Stremmel Jens Encke uta Merle University Hospital of Heidelberg Department of Gastroenterology and Hepatology Im Neuenheimer Feld 410 Heidelberg D-69120 Germany

AIM： To describe the diagnostic criteria for acute liver failure due to Wilson disease （WD）, which is an uncommon cause of acute liver failure （ALF）. METHODS： We compared findings of patients presenting with ALF due to WD to those with ALF of other etiologies. RESULTS： Previously described criteria, such as low alkaline phosphatase activity, ratio of low alkaline phosphatase to total bilirubin or ratio of high aspartate arninotransferase （AST） to alanine arninotransferase （ALT）, failed to identify patients with ALF due to WD. There were significant differences in low ALT and AST activities （53 ± 43 vs 1982 ± 938, P 〈 0.0001 and 87 ± 44 vs 2756 ± 2941, P = 0.037, respectively）, low choline esterase activity （1.79 ± 1.2 vs 4.30 ± 1.2, P = 0.009）, high urine copper concentrations （93.4 ± 144.0 vs 3.5 ± 1.8, P = 0.001） and low hemoglobin （7.0 ± 2.2 vs 12.6 ± 1.8, P 〈 0.0001） in patients with ALF caused by WD as compared with other etiologies. Interestingly, 4 of 7 patients with ALF due to WD survived without liver transplantation. CONCLUSION： In ALF, these criteria can help establish a diagnosis of WD. Where applicable, slitlamp examination for presence of Kayser-Fleischer rings and liver biopsy for determination of hepatic copper concentration still remain important for the diagnosis of ALF due to WD. The need for liver transplantation should be evaluated carefully as the prognosis is not necessarily fatal.

关键词： Acute liver failure Copper metabolism Fulminant hepatic failure Wilson disease Liver transplantation

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Plant diversity and community history shift colonization success from early- to mid-successional species

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Journal of Plant Ecology 2015年第3期8卷 231-241页

作者： Christiane Roscher uta Gerighausen Bernhard Schmid Ernst-Detlef Schulze UFZ Helmholtz Centre for Environmental ResearchDepartment of Community EcologyTheodor-Lieser-Strasse 4D-06120 HalleGermany Max Planck Institute for Biogeochemistry PO Box 100164D-07701 JenaGermany Institute of Evolutionary Biology and Environmental Studies and Zurich-Basel Plant Science Center University of ZurichWinterthurerstrasse 1908057 ZurichSwitzerland

Aims Functional traits are supposed to play an important role in deter-mining the colonization success of new species into established ***-term experimental studies have documented higher resistance of more diverse grasslands against coloni-zation by new ***,little is known about which traits colonizers should have to successfully invade diverse plant communities in the longer term and how community his-tory may modify the resistance of diverse communities against *** In a grassland biodiversity experiment(Jena Experiment)established with different species richness(s;1,2,4,8 and 16)and functional group(Fg)number and composition(1 to 4;legumes,grasses,small herbs,tall herbs),we studied colonization of naturally dispersed species in split-plots(i)with different duration of weeding(never weeded,weeded for 3 or 6 years and then un-weeded for 1 year)and(ii)with different duration of colonization(7 years,4 years and 1 year after cessation of weeding).Important Findingsresistance against colonization by new species declined with increased duration of weeding(on average 13,17 and 22 col-onizer species in 1-,4-and 7-year-old communities,respec-tively).Communities established at low diversity accumulated more colonizer species with a longer duration of weeding than more diverse *** of colonization had only small effects on the number of colonizer *** with early successional traits,*** life cycle,reproduction by seeds,small seeds,long-lived seeds and an earlier start of a longer flowering period,were favoured in species-poor newly established experimental plant communities(short duration of weeding)and early after cessation of weeding(short duration of colonization).a change from early-to mid-successional traits,*** growth,perennial life cycle,vegetative reproduction,characterized colonization at increased plant diversity and in communities with legumes or without *** absence/gr

关键词： abundance-weighted community mean traits biodiversity colonization simple community mean traits species richness

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