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2707篇 您的检索式:作者名="Kristensen"
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1利用地理信息系统数据库分析钉螺空间区域的分布显示文摘目的 利用地理信息系统(GIS)数据库分析中国大陆钉螺的空间区域分布。方法 收集中国九省34 个种群钉螺等位基因实验所得的种群遗传变异资料以及钉螺易感性实验资料,建立数据库。以世界数字地图为背景,在ArcView 3.0 a 软件上与钉螺的遗传变异和易感性数据库相联。采用ArcView 空间分析和GIS重叠分析功能进行区域划分。收集1995 年AVHRRNDVI卫星图像组合成流行季节的卫星图像,并重叠各种群钉螺的杂合指数、多态位点百分率和血吸虫感染率分布图,进行图像分类。结果 空间分析结果,将钉螺遗传杂合性指数、多态位点百分率和钉螺感染率的分布图,划分成西部和东部二大区域,各区域内有各种类型。三层分布图与AVHRRNDVI卫星图像重叠分析后,显示出西部四川、西部云南、中部江湖洲滩和东南部沿海4 个明显不同的区域。结论 首次运用GIS分析种群遗传学资料,佐证了中国大陆钉螺种群结构为分裂亚群结构,并可区分出多个亚种的理论。周晓农 TK Kristensen 洪青标 孙乐平 M Fuentes JB Malone 1999中华预防医学杂志1999,33,6:27
2Feasibility of progressive strength training shortly after hip fracture surgery显示文摘AIM: To investigate the feasibility of a 6-wk progressive strength-training programme commenced shortly after hip fracture surgery in community-dwelling patients.METHODS: This prospective, single-blinded cohort study evaluated 31 community-dwelling patients from four outpatient geriatric health centres aged 60 years or older, who started a 6-wk programme at a mean of 17.5 ± 5.7 d after hip fracture surgery. The intervention consisted primarily of progressive fractured kneeextension and bilateral leg press strength training(twice weekly), with relative loads commencing at 15 and increasing to 10 repetitions maximum(RM), with three sets in each session. The main measurements included progression in weight loads, hip fracture-related pain during training, maximal isometric knee-extension strength, new mobility score, the timed up and go test, the 6-min walk test and the 10-meter fast speed walk test, assessed before and after the programme.RESULTS: Weight loads in kilograms in the fractured limb knee-extension strength training increased from 3.3 ± 1.5 to 5.7 ± 1.7 and from 6.8 ± 2.4 to 7.7 ± 2.6, respectively, in the first and last 2 wk(P < 0.001). Correspondingly, the weight loads increased from 50.3 ± 1.9 to 90.8 ± 40 kg and from 108.9 ± 47.7 to 121.9 ± 54 kg in the bilateral leg press exercise(P < 0.001). Hip fracture-related pain was reduced, and large improvements were observed in the functional outcome measurements, e.g., the 6-min walk test improved from 200.6 ± 79.5 to 322.8 ± 68.5 m(P < 0.001). The fractured limb knee-extension strength deficit was reduced from 40% to 17%, compared with the non-fractured limb. Ten patients reported knee pain as a minor restricting factor during the last 10 RM knee-extension strength-training sessions, but with no significant influences on performance. CONCLUSION: Progressive strength training, initiated shortly after hip fracture surgery, seems feasible and does not increase hip fracture-related pain. Progressive strength training resulted in improvement, although a strength deficit of 17% persisted in the fractured limb compared with the non-fractured limb.Jan Overgaard Morten T Kristensen 2013World Journal of Orthopedics2013,4,4:9
3Important influent-water quality parameters at freshwater production sites in two salmon producing countries显示文摘T. Kristensen ?. ?tland T. Rosten H.A. Urke B.O. Rosseland 2009Aquacultural Engineering2009,,2:3
4用传统方法与计算机辅助精液分析软件CRISMAS分析166名丹麦青年男性精液样本的结果比较显示文摘本研究以166名丹麦青年男性精液为样本,通过评估精于浓度和活力来比较传统精液分析与计算机辅助精液分析方法(CASA)(哥本哈根Rigshospitalet图像屋精子运动分析系统,CRISMAS软件4.6版本)。CRISMAS软件测定精子的浓度把精子活力分为三类。传统分析方法将精子活力分为四种状态。为了便于二者的比较,本文将传统的四种状态根据精子速度等级重新分为三个状态:rapidly progressive(A),slowly progressive(B)和non-progressive(C+D)。两种方法所研究的参数之间都有显著差异(P〈0.001)。与传统方法相比,CRISMAS高估了精子浓度以及快速运动精子的比例,因而低估了慢速运动和非运动精子。为分析研究结果是否会随精液分析时间而起伏变动,将精液分析结果按分析同期分为四个层次。结果表明CRISMAS对活力的分析结果比传统分析方法稳定,但两种方法都未表现出任何趋势。显然,无法比较CRISMAS CASA和传统分析方法在精子浓度和精子活力方面的分析结果。在临床上使用该软件时以及用其研究这些精子特性时需要说明这一点。Anne Vested Cecilia H Ramlau-Hansen Jens P Bonde Ane M Thulstrup Susanne L Kristensen Gunnar Toft 2011Asian Journal of Andrology2011,13,3:3
5北欧岩高兰(Empetrum)生态系统:功能及其对环境变化的敏感性显示文摘本文回顾了关于北欧地区岩高兰(Empetrum nigrum sap.nigrum和ssp.hermaphroditum)生态系统的知识。因为岩高兰叶片及其枯枝落叶含有丰富的酚,分解缓慢,随着有机质表土层的形成,养分存储于有机养分库中,主要由具有石南状根的植物所吸收利用。黑果岩高兰(Empetrum nigrum)亚种Hermaphroditum是强有力的养分竞争者,并且在演替后期能战胜多数植物。这是化学干扰(他感作用)和资源竞争所致。岩高兰作为一种有机体耐大气污染,在适林海岸石南丛生地,由于大气中大量氮的沉积其生长活力甚至有所增加,但是它对机械干扰及火烧非常敏感。然而,有迹象表明,空气中无机气氮的输入可对岩高兰占优势时所形成的封闭式营养循环产生干扰。Knud Tybirk Marie-Charlotte Nilsson Anders Michelsen Hanne Lakkenborg Kristensen Anna shevtsova Morten Tune Strandberg Marianne Johansson Knud Erik Nielsen Torben Riis-Nielsen Beate Strandberg Ib Johansen 萨仁 2000AMBIO-人类环境杂志2000,29,2:3
6Long-term postoperative cognitive dysfunction in the elderly: ISPOCD1 study显示文摘JT Moller P Cluitmans LS Rasmussen P Houx H Rasmussen J Canet P Rabbitt J Jolles K Larsen CD Hanning O Langeron T Johnson PM Lauven PA Kristensen A Biedler H van Beem O Fraidakis JH Silverstein JEW Beneken JS Gravenstein 1998The Lancet . 1998 (9106)1998,,9106:2
7Challenges for land system science显示文摘Mark D.A. Rounsevell Bas Pedroli Karl-Heinz Erb Marc Gramberger Anne Gravsholt Busck Helmut Haberl S?ren Kristensen Tobias Kuemmerle Sandra Lavorel Marcus Lindner Hermann Lotze-Campen Marc J. Metzger David Murray-Rust Alexander Popp Marta Pérez-Soba Anett 2012Land Use Policy2012,,4:2
8Hypothalamic CART is a new anorectic peptide regulated by leptin显示文摘Kristensen P Judge M E Thim L 0,,:2
9Net absorption and liver metabolism of amino acids and heat production of portaldrained viscera and liver in multiparous sows during transition and lactation显示文摘Background:Determination of nutrient requirements in the late gestating and lactating sows is essential to optimize sow productivity.The objectives of the present study were to quantify amino acid(AA)fluxes and heat production across portal-drained viscera(PDV)and liver in multiparous sows during transition and lactation.Methods:Eight second parity sows were fitted with indwelling catheters in the femoral artery and in the mesenteric,portal and hepatic veins.Eight hourly sets of blood samples were taken starting 0.5 h before feeding at−10,−3,+3,and+17 d in milk(DIM).Blood gases,plasma metabolites and apparent total tract digestibility(ATTD)of nutrients were measured.Results:Feed intake,the ATTD of DM,energy,nitrogen,fat and crude fiber changed with DIM(P<0.001).Except for Glu,O2,and urea,all net portal fluxes were positive,and all were affected by DIM(P<0.05)and by sampling time(P<0.01).Compared with pre partum levels,net portal uptake of AA was 3-63%lower at+3 DIM but 40-100%higher at+17 DIM.Net portal fluxes of AA peaked at 1.5 to 2.5 h after feeding except for Glu,and they were positively correlated with changes in sow feed intake across DIM.The net portal recovery was low for Met(49%),Thr(54%),and His(54%)and high for the remaining essential AA(63-69%)and none of them differed across DIM.Net hepatic uptake(i.e.hepatic oxidation)of Lys,Thr,Ile,Leu and Phe peaked at 0.5 to 2.5 h after feeding,whereas uptake of Trp,Val,and His was constant,while that of Met was close to zero.Conclusion:The net portal recovery was substantially lower for Met,Thr,and His than the remaining essential AA.Hepatic AA oxidation peaks 0.5 to 2.5 h after feeding.The heat production in PDV and liver was approximately two-fold higher at peak lactation compared to other stages.The study suggests that lysine was the limiting AA in peak lactation but not in early lactation.Liang Hu Niels Bastian Kristensen Lianqiang Che De Wu Peter Kappel Theil 2020Journal of Animal Science and Biotechnology2020,11,2:2
10A Cambrian micro-lobopodian and the evolution of arthropod locomotion and reproduction显示文摘The evolutionary success of arthropods, the most abundant and diverse animal group, is mainly based on their segmented body and jointed appendages, features that had evolved most likely already before the Cambrian. The first arthropod-like animals, the lobopodians from the Early Cambrian, were unsclerotized and worm-like, and they had unjointed tubular legs. Here we describe the first three-dimensionally preserved Cambrian lobopodian. The material presented of Orstenotubulus evamuellerae gen. et sp. nov. is the smallest and youngest of a lobopodian known. O. evamuellerae shows strikingly detailed similarities to Recent tardigrades and/or onychophorans in its cellular-structured cuticle and the telescopic spines. It also shows similarities to other, longer known lobopodians, but which are ten times as large as the new form. These similarities include the finely annulated body and legs, which is characteristic also for Recent onychophorans, and paired humps continuing into spines situated dorsally to the leg insertions, a feature lacking in the extant forms. The morphology of O. evamuellerae not only elucidates our knowledge about lobopodians, but also aids in a clearer picture of the early evolution of arthropods. An example is the single ventral gonopore between a limb pair of O. evamuellerae, which indicates that a single gonopore, as developed in onychophorans, tardigrades, pentastomids, myriapods and insects, might represent the plesiomorphic state for Arthropoda, while the paired state in chelicerates and crustaceans was convergently achieved. Concerning life habits, the lateral orientation of the limbs and their anchoring spines of the new lobopodian imply that early arthropods were crawlers rather than walkers.Andreas Maas Georg Mayer Reinhardt M. Kristensen Dieter Waloszek 2007Chinese Science Bulletin2007,52,24:2
11Qualities of sessile serrated adenoma/polyp/lesion and its borderline variant in the context of synchronous colorectal carcinoma显示文摘Mahin Mohammadi Michael Holmsgaard Kristensen Hans J?rgen Nielsen Jesper Hansen Bonde Susanne Holck 2012Journal of Clinical Pathology2012,,10:2
12Development and test of small-scale batch-fired straw boilers in denmark显示文摘Kristensen E F Kristenscn J K 2004Biomass and Bioenergy2004,26,6:1
13Parameter estimation in stochastic grey-box models 显示文摘KRISTENSEN N R MADSEN H JORGENSEN S B 2003IFAC Journal of Automatica2003,40,2:1
14Enzymatic conversion of lignocellulose into fermentable sugars: challenges and opportunities 显示文摘Jorgensen H Kristensen J B Felby C 2007Biofuels Bioproducts and Biorefining2007,1,2:1
15Carcinoma of the fallopian tube 显示文摘Baekelandt M Jorunn NA Kristensen GB 2000Cancer2000,89,8:1
16Aminoacid sequence of human pregnancy associated plasma protein-A derived from cloned eDNA显示文摘Kristensen T Oxvig C Stand D 1994Biochemistry1994,33,4:1
17Homocysteineemia and hypofibrinolysis in young adults with ischemic stroke显示文摘Kristensen B Malm J Nilsson TK 1999Stroke1999,30,5:1
18Evaluation of platelet function using the in vitro bleeding time and corrected count increment of transfused platelets显示文摘Eriksson L Kristensen J Olsson K 1996Vox Sang1996,70,1:1
19Molecular epidemiology of breast cancer:genetic variation in steroid hormone metabolism显示文摘Kristensen VN Borresen-Dale AL 2000Mutat Res2000,462,23:1
20Pre - pregnancy weight and the risk of stillbirth and neonatal death 显示文摘Kristensen J 2005B JOG2005,112,4:1
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