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714篇 您的检索式:作者名="Ericson"
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1北方针叶林的氮沉降和生物多样性以及氮的临界负荷显示文摘可将临界负荷概念用于确定生态系统能够忍耐的无显著毒害作用的沉积水平。本文总结了瑞典研究课题'跨界大气污染的削减策略(ASTA)'中北方针叶林氮的临界负荷评估工作。不论是瑞典北方低水平氮背景沉降地区的野外实验,还是大尺度的监测研究,结果都表明:少量增加氮剂量会引发重大的植被变化;并且停止氮输入后,植被恢复非常缓慢。数据表明,即便氮输入的速率低于目前建议的临界负荷(北方针叶林下层植被的经验值为10~15kg N/hm^2·a),生态系统的关键成分也会发生变化。根据这些数据,我们认为临界负荷应降为6 kg N/hm^2·a。Annika Nordin Joachim Strengbom Johanna Witzell Torgny Nsholm Lars Ericson 王胜 2005AMBIO-人类环境杂志2005,34,1:9
2超高效液相色谱/电喷雾串联质谱(UPLC/MS/MS)分析全氟代化合物(PFCs)显示文摘Antonietta Gledhill Anna Karman Ingrid Ericson Bert van Bavel Gunilla Linstrom Gordon Kearney 2007环境化学2007,26,5:6
3瑞典森林中不同地区的林下植被情况与氮沉积的关系显示文摘在557块针叶林分中进行调查,以图了解欧洲越桔(Vaccinium myrtillus)、越桔(V.vitis-idaea)和曲芒发草(Deschampsia flexuosa)与氮沉积率的相互联系。欧洲越桔在高氮地区比在低氮地区发生频度、丰富度都较少并且易感染叶部病原(Valdensia heterodoxa),越桔的发生与氮沉积的增加呈明显的负相关,曲芒发草却没有这种趋势。在高氮沉积地区,欧洲越桔在优势种为欧洲赤松的林分中比在挪威云杉为优势种的林分中更为最普遍。在氮沉积较低水平的地区不是这种情形。调查的情况与增施氮素实验的结果一致,氮沉积对植被显示了巨大的效应。数据表明即使是较低的氮沉积也可能减少针叶林分林下植被最优势种的丰富度。Joachim Strengbom Mats Walheim Trogny Nsholm Lars Ericson 伍建榕 2003AMBIO-人类环境杂志2003,32,2:5
4种间竞争梯度对白车轴草与其病原菌白车轴草单孢锈菌相互作用的影响(英文)显示文摘白车轴草 (Trifolium repens)在与其病原菌白车轴草单孢锈菌 (Uromyces trifolii- repentis)的长期相互作用中分化形成了抗病型 (Resistance)无性系和易感型 (Susceptibility)无性系。该研究工作旨在了解 :1)在种间竞争不断增强的环境梯度中 ,抗病型无性系和易感型无性系的生长表现有何区别 ?2 )在同样的实验条件下 ,分别对抗病型无性系和易感型无性系进行接种感染后 ,两者的生长表现又有何区别 ?在一严重感病的白车轴草自然种群中 ,分别标定 17个抗病型无性系和 14个易感型无性系 ,从各无性系的匍匐茎上分别剪取长 5 cm ,具两个叶两个腋芽的小段作实验材料。接种孢子采自同一植物种群植株的病叶。实验在一个处在次生演替阶段的草本植物群落上进行 ,在该群落的种间竞争梯度上选定 3个分别具有弱、中等和强种间竞争的生境 (Habitat)建立实验站 ,每站设置等量的实验组和对照组。结果显示 :1)随着环境中种间竞争强度的增加 ,无论接种与否 ,抗病型和易感型白车轴草的叶生长量均递减 ;2 )在弱或强种间竞争环境条件下 ,无论接种与否 ,易感型无性系的生长均好于抗病型无性系 ;但在中等种间竞争强度的环境条件下 ,对照实验中易感型无性系的生长显著好于抗病型无性系 ,而接种实验中的结果相反。刘登义 Lars Ericson 2001植物生态学报2001,25,3:4
5麦角硫因或可降低心血管疾病发生及死亡风险显示文摘目的近期研究发现一种健康饮食模式(HCFP)与降低心脏代谢疾病风险相关,但导致这种相关性的分子机制尚不明确。该研究旨在发现与这种饮食模式相关的血浆代谢物,并研究其与心脏代谢疾病发生和死亡风险的相关性。方法从全人群马尔默饮食和癌症研究中,筛选出3236名无心血管疾病和糖尿病史的参与者。运用液相色谱-质谱法对他们的112种血浆代谢物进行检测。通过多元线性回归和Bonfcrroni校正分析,发现其中与该饮食模式相关的代谢物。使用多变量Cox比例风险模型进行长期随访分析后,发现这些健康饮食的生物标志物与心脏代谢疾病的发生和死亡风险相关。结果平均随访21.4年期间,603人患心血管疾病,362人患糖尿病,843人死亡。基线资料中,5种健康饮食标志物与该饮食模式相关(P<0.0004),其中4种与至少一项研究终点相关(P<0.05)。麦角硫因是与该饮食模式相关性最强的代谢物,并且与降低冠心病风险(危害比0.85,P=0.01)、心血管死亡风险(危害比0.79,P=0.002)、全因死亡风险(麦角硫因每增加一个标准差的危害比,危害比0.86,P=4e-5)相关。结论我们发现高麦角硫因含量是降低心脏代谢疾病发生和死亡风险的独立标志物。而这种高含量很可能是由某种特殊的饮食方式造成的。Einar Smith Filip Ottosson Sophie Hellstrand Ulrika Ericson Marju Orho-Melander Celine Fernandez Olle Melander 冯博(译) 2020英国医学杂志中文版2020,23,4:4
6Rapid phenotypic evolution with shallow genomic differentiation during early stages of high elevation adaptation in Eurasian Tree Sparrows显示文摘Known as the‘third polar region’,the Qinghai-Tibet Plateau represents one of the harshest highland environments in the world and yet a number of organisms thrive there.Previous studies of birds,animals and humans have focused on well-differentiated populations in later stages of phenotypic divergence.The adaptive processes during the initial phase of highland adaptation remain poorly understood.We studied a human commensal,the Eurasian Tree Sparrow,which has followed human agriculture to the Qinghai-Tibet Plateau.Despite strong phenotypic differentiation at multiple levels,in particular in muscle-related phenotypes,highland and lowland populations show shallow genomic divergence and the colonization event occurred within the past few thousand years.In a one-month acclimation experiment investigating phenotypic plasticity,we exposed adult lowland tree sparrows to a hypoxic environment and did not observe muscle changes.Through population genetic analyses,we identified a signature of polygenic adaptation,whereby shifts in allele frequencies are spread across multiple loci,many of which are associated with muscle-related processes.Our results reveal a case of positive selection in which polygenic adaptation appears to drive rapid phenotypic evolution,shedding light on early stages of adaptive evolution to a novel environment.Yanhua Qu Chunhai Chen Ying Xiong Huishang She Yong E Zhang Yalin Cheng Shane DuBay Dongming Li Per G P Ericson Yan Hao Hongyuan Wang Hongfeng Zhao Gang Song Hailin Zhang Ting Yang Chi Zhang Liping Liang Tianyu Wu Jinyang Zhao Qiang Gao Weiwei Zhai Fumin Lei 2020National Science Review2020,7,1:2
7Studies of growth factors for Streptococcus facalis occurring in marine algae 显示文摘Ericson L E Widoff E Bauhidi Z G 1953Acta Chem Scand1953,,:2
8Spatial learning deficits and emotional impairment in pentylenetetrazole- kindled rats显示文摘Mortazavi F Ericson M Story D 2005Epilepsy Behav2005,7,4:1
9Diffusion-weighted MR and apparent diffusion coefficient in the evaluation of severe brain injury显示文摘Nakahara M Ericson K Benander B M 2001Acta Radiol2001,42,4:1
10Diffusion-weighted MR and apparent diffusion coefficient in the evaluation of severe brain injury 显示文摘Nakahara M Ericson K BeUander BM 2001Acta Radio2001,42,:1
11Heart rate variability in long term risk assessment in middle aged women with coronary heart disease:the Stockholm female coronary risk study显示文摘Janszky I Ericson M Mittleman MA 2004J Intern Med2004,255,1:1
12A Review of the Concept of Visual Literacy显示文摘Maria Avgerinou John Ericson 1997British Journal of Educational Technology1997,28,4:1
13Exposure of per- fluorinated chemicals through lactation:levels of matched human milk and serum and a temporal trend, 1996-2004, in Sweden 显示文摘Karrman A Ericson I Van Bavel B 2007Environ Health Perspect2007,115,2:1
14Lesion-de- pendent regulation of transgene expression in the rat brain using a human glial fibrillary acidic protein-lentiviral vector 显示文摘Jakobsson J Georgievska B Ericson C 2004Eur J Neurosci2004,19,:1
15The Cinnamon Ibon Hypocryptadius cinnamomeus is a forest canopy sparrow显示文摘Fjelds(a) J Irestedt M Ericson PGP Zuccon D 0,,:1
16Bioavailability of aminolaevulinie acid and methylaminolaevulinate in basal cell carcinomas: a perfusion study using microdialysis in vivo 显示文摘Sandberg C Halldin CB Ericson MB 2008Br J Dermatol2008,159,5:1
17Evaluation of the OECD 314B activated sludge die- away test for assessing the biodegradation of pharmaceuticals 显示文摘Ericson J F 2010Environmental Science & Technology2010,44,1:1
18Improved drought tol erance without undesired side effects in transgenic plants produ cing trehalose显示文摘Karim S Aronsson H Ericson H 2007Plant Molecular Biology2007,64,4:1
19Residue depletion studies on danofloxacin in the chickens显示文摘Lynch M J Rice J Ericson J F 1994J Agric Food Chem1994,42,4:1
20In situ tensile strength measurement and weibull analysis of thick film and thin film micromachined polysilicon structures 显示文摘Staffan Greek Fredric Ericson Stefan Johansson 1997Thin Solid Film1997,292,12:1
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