|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | On the combined effect of soil fertility and topography on tree growth in subtropical forest ecosystems—a study from SE China显示文摘Aims The aim of our research was to understand small-scale effects of topography and soil fertility on tree growth in a forest biodiversity and ecosystem functioning(BEF)experiment in subtropical SE China.Methods Geomorphometric terrain analyses were carried out at a spatial resolution of 5×5 m.Soil samples of different depth increments and data on tree height were collected from a total of 566 plots(667 m2 each).The soils were analyzed for carbon(soil organic carbon[SOC]),nitrogen,acidity,cation exchange capacity(CEC),exchangeable cations and base saturation as soil fertility attributes.All plots were classified into geomorphological units.Analyses of variance and linear regressions were applied to all terrain,soil fertility and tree growth attributes.Important Findings In general,young and shallow soils and relatively small differences in stable soil properties suggest that soil erosion has truncated the soils to a large extent over the whole area of the experiment.This explains the concurrently increasing CEC and SOC stocks downslope,in hollows and in valleys.However,colluvial,carbon-rich sediments are missing widely due to the convexity of the footslopes caused by uplift and removal of eroded sediments by adjacent waterways.The results showed that soil fertility is mainly influenced by topography.Monte-Carlo flow accumulation(MCCA),curvature,slope and aspect significantly affected soil fertility.Furthermore,soil fertility was affected by the different geomorphological positions on the experimental sites with ridge and spur positions showing lower exchangeable base cation contents,especially potassium(K),due to leaching.This geomorphological effect of soil fertility is most pronounced in the topsoil and decreases when considering the subsoil down to 50 cm depth.Few soil fertility attributes affect tree height after 1-2 years of growth,among which C stocks proved to be most important while pH_(KCl)and CEC only played minor roles.Nevertheless,soil acidity and a high proportion of Al on the exchange complex affected tree height even after only 1-2 years growth.Hence,our study showed that forest nutrition is coupled to a recycling of litter nutrients,and does not only depend on subsequent supply of nutrients from the mineral soil.Besides soil fertility,topography affected tree height.We found that especially MCCA as indicator of water availability affected tree growth at small-scale,as well as aspect.Overall,our synthesis on the interrelation between fertility,topography and tree growth in a subtropical forest ecosystem in SE China showed that topographic heterogeneity lead to ecological gradients across geomorphological positions.In this respect,small-scale soil-plant interactions in a young forest can serve as a driver for the future development of vegetation and biodiversity control on soil fertility.In addition,it shows that terrain attributes should be accounted for in ecological research. | Thomas Scholten Philipp Goebes Peter Kühn Steffen Seitz Thorsten Assmann Jürgen Bauhus Helge Bruelheide Francois Buscot Alexandra Erfmeier Markus Fischer Werner Härdtle Jin-Sheng He Keping Ma Pascal A.Niklaus Michael Scherer-Lorenzen Bernhard Schmid Xuezheng Shi Zhengshan Song Goddert von Oheimb Christian Wirth Tesfaye Wubet Karsten Schmidt | 2017 | Journal of Plant Ecology2017，10，1： | 22 |
| 2 | Single-operator cholangioscopy for biliary complications in liver transplant recipients显示文摘AIM To evaluate cholangioscopy in addition to endoscopic retrograde cholangiopancreatography(ERCP) for management of biliary complications after liver transplantation(LT).METHODS Twenty-six LT recipients with duct-to-duct biliary reconstruction who underwent ERCP for suspected biliary complications between April and December2016 at the university hospital of Muenster were consecutively enrolled in this observational study. After evaluating bile ducts using fluoroscopy, cholangioscopy using a modern digital single-operator cholangioscopy s y s t e m(S py G la s s D S ?) wa s pe r fo r me d dur ing the same procedure with patients under conscious sedation. All patients received peri-interventional antibiotic prophylaxis and bile was collected during the intervention for microbial analysis and for antibiotic susceptibility testing.RESULTS Thirty-three biliary complications were found in a total of 22 patients, whereas four patients showed normal bile ducts. Anastomotic strictures were evident in 14(53.8%) patients, non-anastomotic strictures in seven(26.9%), biliary cast in three(11.5%), and stones in six(23.1%). A benefit of cholangioscopy was seen in 12(46.2%) patients. In four of them, cholangioscopy was crucial for selective guidewire placement prior to planned intervention. In six patients, biliary cast and/or stones failed to be diagnosed by ERCP and were only detectable through cholangioscopy. In one case, a bile duct ulcer due to fungal infection was diagnosed by cholangioscopy. In another case, signs of bile duct inflammation caused by acute cholangitis were evident. One patient developed post-interventional cholangitis. No further procedure-related complications occurred. Thirty-seven isolates were found in bile. Sixteen of these were gram-positive(43.2%), 12(32.4%) were gram-negative bacteria, and Candida species accounted for 24.3% of all isolated microorganisms. Interestingly, only 48.6% of specimens were sensitive to prophylactic antibiotics.CONCLUSION Single-operator cholangioscopy can provide important diagnostic information, helping endoscopists to plan and perform interventional procedures in LT-related biliary complications. | Anna Hüsing-Kabar Hauke Sebastian Heinzow Hartmut Hans-Jürgen Schmidt Carina Stenger Hans Ulrich Gerth Michele Pohlen Gerold Tholking Christian Wilms Iyad Kabar | 2017 | World Journal of Gastroenterology2017，23，22： | 4 |
| 3 | Role of HSP-90 for increased nNOS-mediated vasodilation in mesenteric arteries in portal hypertension显示文摘AIM:To explore the role of heat shock protein-90 (HSP-90) for nitrergic vasorelaxation in the splanchnic circulation in rats with and without portal hypertension. METHODS: Neuronal nitric oxide synthase (nNOS) and HSP-90 were analyzed by immunofluorescence, western blotting and co-immunoprecipitation in the mesenteric vasculature and isolated nerves of portal-vein-ligated (PVL) rats and sham operated rats. In vitro perfused de-endothelialized mesenteric arterial vasculature was preconstricted with norepinephrine (EC80) and tested for nNOS-mediated vasorelaxation by periarterial nerve stimulation (PNS, 2-12 Hz, 45V) before and after incubation with geldanamycin (specific inhibitor of HSP-90 signalling, 3 μg/mL) or L-NAME (non-specific NOSblocker, 10-4 mol/L). RESULTS: nNOS and HSP-90 expression was significantly increased in mesenteric nerves from PVL as compared to sham rats. Moreover, nNOS and HSP-90 were visualized in mesenteric nerves by immunofluorescence and immunoprecipitation of nNOS co-immunoprecitated HSP-90 in sham and PVL rats. PNS induced a frequencydependent vasorelaxation which was more pronounced in PVL as compared to sham rats. L-NAME and geldanamycin markedly reduced nNOS-mediated vasorelaxation abrogating differences between the study groups. The effect of L-NAME and geldanamycin on nNOS-mediated vasorelaxation was significantly greater in PVL than in sham animals. However, no difference in magnitude of effect between L-NAME and geldanamycin was noted. CONCLUSION: HSP-90 acts as a signalling mediator of nNOS-dependent nerve mediated vascular responses in mesenteric arteries, and the increased nitrergic vasorelaxation observed in portal hypertension is mediated largely by HSP-90. | Lukas Moleda Lars Jurzik Matthias Froh Erwin Gbele Claus Hellerbrand Rainer H Straub Jürgen Schlmerich Reiner Wiest | 2010 | World Journal of Gastroenterology2010，16，15： | 4 |
| 4 | Second European evidence-based consensus on the diagnosis and management of ulcerative colitis: Special situations显示文摘 | Gert Van Assche Axel Dignass Bernd Bokemeyer Silvio Danese Paolo Gionchetti Gabriele Moser Laurent Beaugerie Fernando Gomollón Winfried H?user Klaus Herrlinger Bas Oldenburg Julian Panes Francisco Portela Gerhard Rogler Jürgen Stein Herbert Tilg Simon Tra | 2012 | Journal of Crohn’s and Colitis2012，，： | 4 |
| 5 | Clinical course during the first 10 years of ulcerative colitis: results from a population-based inception cohort (IBSEN Study)显示文摘 | Inger Camilla Solberg Idar Lygren J?rgen Jahnsen Erling Aadland Ole H?ie Milada Cvancarova Tomm Bernklev Magne Henriksen Jostein Sauar Morten H. Vatn Bj?rn Moum And the IBSEN Study Group | 2009 | Scandinavian Journal of Gastroenterology2009，，4： | 3 |
| 6 | Distribution and effects of polymorphic RANTES gene alleles in HIV/HCV coinfection - A prospective cross-sectional study显示文摘AIM: Chemokines and their receptors are crucial for immune responses in HCV and HIV infection. RANTES gene polymorphisms lead to altered gene expression and influence the natural course of HIV infection. Therefore,these mutations may also affect the course of HIV/HCV coinfection.METHODS: We determined allele frequencies of RANTES-403 (G→A), RANTES-28 (C→G) and RANTESIN1.1 (T→C) polymorphisms using real-time PCR and hybridization probes in patients with HIV (n = 85), HCV (n= 112), HIV/HCV coinfection (n = 121), and 109 healthy controls. Furthermore, HIV and HCV loads as well as CD4+ and CD8+ cell counts were compared between different RANTES genotypes.RESULTS: Frequencies of RANTES-403 A, RANTES-28 G and RANTES-IN1.1 C alleles were higher in HIV infected patients than in healthy controls (-403: 28.2% vs 15.1%,P = 0.002; -28: 5.4% vs 2.8%, not significant; IN1.1:19.0% vs 11.0%, P = 0.038). In HIV/HCV coinfected patients, these RANTES alleles were less frequent than in patients with HIV infection alone (15.4% P = 0.002;1.7%; P = 0.048; 12.0%; not significant). Frequencies of these alleles were not significantly different between HIV/HCV positive patients, HCV positive patients and healthy controls.CONCLUSION: All three RANTES polymorphisms showed increased frequencies of the variant allele exclusively in patients with HIV monoinfection. The finding that the frequencies of these alleles remained unaltered in HIV/HCV coinfected patients suggests that HCV coinfection interferes with selection processes associated with these alleles in HIV infection. | Golo Ahlenstiel Agathe Iwan Jacob Nattermann Karin Bueren Jürgen K Rockstroh Hans H Brackmann Bernd Kupfer Olfert Landt Amnon Peled Tilman Sauerbruch Ulrich Spengler Rainer P Woitas | 2005 | World Journal of Gastroenterology2005，11，48： | 3 |
| 7 | High Hepatic SCD1 Activity Is Associated with Low Liver Fat Content in Healthy Subjects under a Lipogenic Diet显示文摘 | Günther Silbernagel Marketa Kovarova Alexander Cegan Jürgen Machann Fritz Schick Rainer Lehmann Hans-Ulrich H?ring Norbert Stefan Erwin Schleicher Andreas Fritsche Andreas Peter | 2012 | The Journal of Clinical Endocrinology & Metabolism2012，，12： | 3 |
| 8 | National Forest Inventories capture the multifunctionality of managed forests in Germany显示文摘Background:Forests perform various important ecosystem functions that contribute to ecosystem services.In many parts of the world,forest management has shifted from a focus on timber production to multi-purpose forestry,combining timber production with the supply of other forest ecosystem services.However,it is unclear which forest types provide which ecosystem services and to what extent forests primarily managed for timber already supply multiple ecosystem services.Based on a comprehensive dataset collected across 150 forest plots in three regions differing in management intensity and species composition,we develop models to predict the potential supply of 13 ecosystem services.We use those models to assess the level of multifunctionality of managed forests at the national level using national forest inventory data.Results:Looking at the potential supply of ecosystem services,we found trade-offs(e.g.between both bark beetle control or dung decomposition and both productivity or soil carbon stocks)as well as synergies(e.g.for temperature regulation,carbon storage and culturally interesting plants)across the 53 most dominant forest types in Germany.No single forest type provided all ecosystem services equally.Some ecosystem services showed comparable levels across forest types(e.g.decomposition or richness of saprotrophs),while others varied strongly,depending on forest structural attributes(e.g.phosphorous availability or cover of edible plants)or tree species composition(e.g.potential nitrification activity).Variability in potential supply of ecosystem services was only to a lesser extent driven by environmental conditions.However,the geographic variation in ecosystem function supply across Germany was closely linked with the distribution of main tree species.Conclusions:Our results show that forest multifunctionality is limited to subsets of ecosystem services.The importance of tree species composition highlights that a lack of multifunctionality at the stand level can be compensated by managing forests at the landscape level,when stands of complementary forest types are combined.These results imply that multi-purpose forestry should be based on a variety of forest types requiring coordinated planning across larger spatial scales. | Nadja K.Simons María R.Felipe-Lucia Peter Schall Christian Ammer Jürgen Bauhus Nico Blüthgen Steffen Boch François Buscot Markus Fischer Kezia Goldmann Martin M.Gossner Falk Hänsel Kirsten Jung Peter Manning Thomas Nauss Yvonne Oelmann Rodica Pena Andrea Polle Swen C.Renner Michael Schloter Ingo Schöning Ernst-Detlef Schulze Emily F.Solly Elisabeth Sorkau Barbara Stempfhuber Tesfaye Wubet Jörg Müller Sebastian Seibold Wolfgang W.Weisser | 2021 | Forest Ecosystems2021，8，1： | 2 |
| 9 | Color Doppler sonography in hypothyroidism显示文摘 | Susanne L Schulz Uwe Seeberger Jürgen H Hengstmann | 2002 | European Journal of Ultrasound2002，，3： | 2 |
| 10 | Clinical efficacy of cardiac resynchronization therapy using left ventricular pacing in heart failure patients stratified by severity of ventricular conduction delay显示文摘 | Angelo Auricchio Christoph Stellbrink Christian Butter Stefan Sack Jürgen Vogt Anand Ramdat Misier Dirk B?cker Michael Block Johannes H Kirkels Andrew Kramer Etienne Huvelle | 2003 | Journal of the American College of Cardiology2003，，12： | 1 |
| 11 | 肿瘤18F-FDG PET/MRI全身显像专家共识(德国)显示文摘PET/MRI一体机在2006年被首次提出可应用于临床;2010年,首台临床型PET/MRI一体机诞生。在20世纪早期,PET/CT和SPECT/CT一体机的广泛应用体现了融合显像的优势,为PET/MRI一体机的产生奠定了基础。目前,全球大约有150台全身PET/MRI一体机投入了临床应用,其中肿瘤显像是PET/MRI的主要应用领域之一。迄今为止,尽管PET/MRI临床应用在增加,但标准化的PET/MRI扫描方案还很少。因此,有必要制定患者检查和多中心研究都可遵循的标准化且一致性好的显像方案。该文总结了18F-脱氧葡萄糖(FDG)PET/MRI全身显像的患者就诊、检查准备、工作流程、显像方案以及报告书写等主要方面的专家共识,由长期使用PET、MRI和较早使用PET/MRI的相关资深专家制定。 | 王洋洋 杨光杰(译) 王振光(审校) Lale Umutlu Thomas Beyer Johannes Stefan Grueneisen Christoph Rischpler Harald H Quick Veit-Haibach Patrick Matthias Eiber Sandra Purz Gerald Antoch Sergios Gatidis Konstantin Nikolaou Jürgen FSchaefer IvoRausch Herrmann Ken K.Herrmann B.J.Krause S.O.Schoenberg L.Umutlu F.Anton G.Antoch M.Hacker M.Luster S.Neumann D.Vorwerk | 2020 | 中华核医学与分子影像杂志2020，40，9： | 1 |
| 12 | Survival of the flexible:hormonal growth control and adaptation in plant development显示文摘 | WOLTERS H J(U)RGENS G | | 0，，05： | 1 |
| 13 | La-boratory met-hods for the diagnosis of Legionella infections显示文摘 | Matthias Maiwalda Jürgen H Helbigb P Christian Lück | 1998 | Journal of Microbiological Methods1998，33，6： | 1 |
| 14 | The potential importance of grazing- resistant bacteria in planktonic systems显示文摘 | J u rgens K G 0 de H | 1994 | Mar Ecol Prog Ser1994，112，： | 1 |
| 15 | Organic carbon content in surface sediments-defining regional provinces显示文摘 | SEITER K CHRISTIAN H JRGEN S | 2004 | Deep Sea Research I2004，51，： | 1 |
| 16 | Theantiepileptic drug topiramate is a substrate for human P-gly-coprotein but not multidrug resistance proteins显示文摘 | Luna-Tortós C Rambeck B Jürgens U H | 2009 | PharmRes2009，26，11： | 1 |
| 17 | Role of river bed sediments as sources and sinks of phosphorus across two major eutrophic UK river basins: the Hampshire Avon and Hertfordshire Wye显示文摘 | JARVIE H P JI]RGENS M D WILLIAMS R J | 2005 | J Hydro12005，304，： | 1 |
| 18 | Variance components and genetic trend for somatic cell count in Norwegian cattle显示文摘 | Jφrgen φ Gunnar K Bjφrg H | 2003 | Livest Prod Sci2003，79，： | 1 |
| 19 | Laparoscop ic ovarian drilling in polycystic ovary syndrome显示文摘 | Api M G rgen H Cetin A | 2005 | Eur J Obstet Gynecol Rep rod Biol2005，119，1： | 1 |
| 20 | Inter-individual variability of oscillatory responses to subject’s own name. A single-subject analysis显示文摘 | Yvonne H?ller Martin Kronbichler Jürgen Bergmann Julia Sophia Crone Elisabeth Verena Schmid Stefan Golaszewski Gunther Ladurner | 2011 | International Journal of Psychophysiology2011，，3： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员