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310篇 您的检索式:作者名="Lars J"
    题名 作者 年代 出处 被引量
1高原泥炭记录揭示的全新世季风快速变化显示文摘利用青藏高原东北缘的泥炭沉积记录,重建了该地区全新世冬、夏季风快速波动历史,清晰地识别出9次可与北大西洋浮冰碎屑事件及低纬海面降温事件相对比的气候干冷事件。总有机碳含量频谱分析揭示的1 428、512、2552、17 a气候准周期,表明中纬度地区百年至千年尺度气候韵律的存在,全新世气候快速变化具有全球性。鲜锋 周卫健 于学峰 卢雪峰 A J T Jull Lars G Franzén 2006海洋地质与第四纪地质2006,26,1:9
2Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 2012The Lancet2012,,9853:5
3Effects of sleep bruxism on functional and occlusal parameters:a prospective controlled investigation显示文摘This study was conducted to verify the results of a preceding retrospective pilot study by means of a prospective controlled investigation including a larger sample size.Therefore,the aim of this clinical investigation was to analyze the relationship between sleep bruxism and several functional and occlusal parameters.The null hypothesis of this study was that there would be no differences among sleep bruxism subjects and non-sleep bruxism controls regarding several functional and occlusal parameters.Fifty-eight sleep bruxism subjects and 31 controls participated in this study.The diagnosis sleep bruxism was based on clinical criteria of the American Academy of Sleep Medicine.Sixteen functional and occlusal parameters were recorded clinically or from dental study casts.Similar to the recently published retrospective pilot study,with a mean slide of 0.77 mm(s.d.,0.69 mm) in the sleep bruxism group and a mean slide of 0.4 mm(s.d.,0.57 mm) in the control group,the evaluation of the mean comparison between the two groups demonstrated a larger slide from centric occlusion to maximum intercuspation in sleep bruxism subjects(Mann-Whitney U-test;P50.008).However,following Bonferroni adjustment,none of the 16 occlusal and functional variables differed significantly between the sleep bruxism subjects and the non-sleep bruxism controls.The present study shows that the occlusal and functional parameters evaluated do not differ between sleep bruxism subjects and non-sleep bruxism subjects.However,as the literature reveals a possible association between bruxism and certain subgroups of temporomandibular disorders,it appears advisable to incorporate the individual adaptive capacity of the stomatognathic system into future investigations.Michelle Alicia Ommerborn Maria Giraki Christine Schneider Lars Michael Fuck Jrg Handschel Matthias Franz Wolfgang Hans-Michael Raab Ralf Schfer 2012International Journal of Oral Science2012,4,3:4
4Role 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 Gbele Claus Hellerbrand Rainer H Straub Jürgen Schlmerich Reiner Wiest 2010World Journal of Gastroenterology2010,16,15:4
5Silvicultural alternatives to conventional even-aged forest man-agement-what limits global adoption?显示文摘Background: The development of forestry as a scientific and management discipline over the last two centuries has mainly emphasized intensive management operations focused on increased commodity production, mostly wood. This 'conventional' forest management approach has typically favored production of even-aged, single-species stands. While alternative management regimes have generally received less attention, this has been changing over the last three decades, especially in countries with developed economies. Reasons for this change include a combination of new information and concerns about the ecological consequences of intensive forestry practices and a willingness on the part of many forest owners and society to embrace a wider set of management objectives. Alternative silvicultural approaches are characterized by a set of fundamental principles, including avoidance of clearcutting, an emphasis on structural diversity and small-scale variability, deployment of mixed species with natural regeneration,and avoidance of intensive site-preparation methods.Methods: Our compilation of the authors' experiences and perspectives from various parts of the world aims to initiate a larger discussion concerning the constraints to and the potential of adopting alternative silvicultural practices.Results: The results suggest that a wider adoption of alternative silvicultural practices is currently hindered by a suite of ecological, economic, logistical, informational, cultural, and historical constraints. Individual contexts display their own unique combinations and relative significance of these constraints, and accordingly, targeted efforts, such as regulations and incentives, may help to overcome specific challenges.Conclusions: In a broader context, we propose that less emphases on strict applications of principles and on stand structures might provide additional flexibility and facilitate the adoption of alternative silvicultural regimes in a broader set of circumstances. At the same time, the acceptance of alternative silvicultural systems as the 'preferred or default mode of management' wil necessitate and benefit from the continued development of the scientific basis and valuation of a variety of ecosystem goods and services. This publication is aimed to further the discussion in this context.Klaus J Puettmann Scott McG Wilson Susan C Baker Pablo J Donoso Lars Dr?ssler Girma Amente Brian D Harvey Thomas Knoke Yuanchang Lu Susanna Nocentini Francis E Putz Toshiya Yoshida Jürgen Bauhus 2015Forest Ecosystems2015,2,2:4
6Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 20122012 (9853)2012,,9853:3
7镉暴露和健康危害——最近的发现显示文摘环境和/或职业性接触绩能引起人的肾小管功能障碍。如果所接触的镉浓度高、接触时间长则可能发展到更加综合性的肾伤害和骨科疾病。最近的科学研究表明:发生早期肾效应的镉浓度比以前预料的要低。对于镉的早期危险评估,主要是根据对健康男性工人的研究得出的。但是,一般人群,特别是易受影响的部分人群,例如老年人和有病的人(例如糖尿病患者),他们容易患有镉诱发的疾病。有很大一部分人在尿液中镉浓度含量约3nmol/mmo肌酐酸时,就有早期的中毒迹象。在相对低水平暴露时,除了早期肾小管影响外,镉还在矿物质代谢和骨骼矿化作用上产生直接或间接的影响,这可能有重要的健康含意,因为骨质脆弱和易骨折是所有工业化国家老年人中的主要问题。Carl-G.Elinder Lars Jrup 续曙光 1996人类环境杂志1996,25,5:3
8Ultrasound Doppler system for two-dimensional flow mapping in liquid metals显示文摘Sven Franke Lars Büttner Jürgen Czarske Dirk R?biger Sven Eckert 2010Flow Measurement and Instrumentation2010,,3:3
9IL-6 and Stat3 Are Required for Survival of Intestinal Epithelial Cells and Development of Colitis-Associated Cancer显示文摘Sergei Grivennikov Eliad Karin Janos Terzic Daniel Mucida Guann-Yi Yu Sivakumar Vallabhapurapu Jürgen Scheller Stefan Rose-John Hilde Cheroutre Lars Eckmann Michael Karin 2009Cancer Cell2009,,2:3
10Current status of cadmium as an environmental health problem显示文摘Lars J?rup Agneta ?kesson 2009Toxicology and Applied Pharmacology2009,,3:2
11Hazards of heavy metal contamination显示文摘Lars rup 2003British Medical Bulletin2003,,:2
12DNA polymorphism of HLA class II genes in primary biliary cirrhosis显示文摘Niels Morling Kim Dalhoff Lars Fugger J?rgen Georgsen Bodil Jakobsen Leo Ranek Niels ?dum Arne Svejgaard 1992Immunogenetics1992,,2:2
13Is Preoperative Chemotherapy Followed by Surgery the Appropriate Treatment for Signet Ring Cell Containing Adenocarcinomas of the Esophagogastric Junction and Stomach?显示文摘Ulrike Heger Susanne Blank Christiane Wiecha Rupert Langer Wilko Weichert Florian Lordick Thomas Bruckner Martin Dobritz Maria Burian Christoph Springfeld Lars Grenacher J?rg-Rüdiger Siewert Markus Büchler Katja Ott 2014Annals of Surgical Oncology2014,,5:2
14Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 2012The Lancet . 2012 (9853)2012,,:2
15Shot-noise limited, supercontinuum-based optical coherence tomography显示文摘We present the first demonstration of shot-noise limited supercontinuum-based spectral domain optical coherence tomography(SD-OCT)with an axial resolution of 5.9μm at a center wavelength of 1370 nm.Current supercontinuumbased SD-OCT systems cannot be operated in the shot-noise limited detection regime because of severe pulse-topulse relative intensity noise of the supercontinuum source.To overcome this disadvantage,we have developed a low-noise supercontinuum source based on an all-normal dispersion(ANDi)fiber,pumped by a femtosecond laser.The noise performance of our 90 MHz ANDi fiber-based supercontinuum source is compared to that of two commercial sources operating at 80 and 320 MHz repetition rate.We show that the low-noise of the ANDi fiber-based supercontinuum source improves the OCT images significantly in terms of both higher contrast,better sensitivity,and improved penetration.From SD-OCT imaging of skin,retina,and multilayer stacks we conclude that supercontinuumbased SD-OCT can enter the domain of shot-noise limited detection.Shreesha Rao D.S. Mikkel Jensen Lars Grüner-Nielsen Jesper Toft Olsen Peter Heiduschka Björn Kemper Jürgen Schnekenburger Martin Glud Mette Mogensen Niels Møller Israelsen Ole Bang 2021Light(Science & Applications)2021,10,7:2
16Ulcerative colitis显示文摘Ingrid Ordás Lars Eckmann Mark Talamini Daniel C Baumgart William J Sandborn 2012The Lancet2012,,9853:2
17A simple method for reconstructing a high-quality NDVI time-series data set based on the Savitzky–Golay filter显示文摘Jin Chen Per. J?nsson Masayuki Tamura Zhihui Gu Bunkei Matsushita Lars Eklundh 2004Remote Sensing of Environment2004,,3:2
18TIMESAT—a program for analyzing time-series of satellite sensor data显示文摘Per J?nsson Lars Eklundh 2004Computers and Geosciences2004,,8:2
19Identification of Gene Expression–Based Prognostic Markers in the Hematopoietic Stem Cells of Patients With Myelodysplastic Syndromes显示文摘Andrea Pellagatti Axel Benner Ken I. Mills Mario Cazzola Aristoteles Giagounidis Janet Perry Luca Malcovati Matteo G. Della Porta Martin J?dersten Amit Verma Emma-Jane McDonald Sally Killick Eva Hellstr?m-Lindberg Lars Bullinger James S. Wainscoat Jacquel 2013Journal of Clinical Oncology2013,,28:2
20Oligonucleotide-priming methods for the chromosome-specific labelling of alpha satellite DNA in situ显示文摘J?rn E. Koch Steen K?lvraa Kirsten B. Petersen Niels Gregersen Lars Bolund 1989Chromosoma1989,,4:1
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