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243篇 您的检索式:作者名="Letcher"
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1全球气候变化对北极海洋生态系统持久性有机污染物和汞途径及暴露的生态影响研究显示文摘生物累积性和生物放大污染物,如持久性有机污染物(POPs)和汞(Hg),数十年来一直被公认为在北极海洋生物健康的关注。近年来,全球气候变化(GCC)和北极海冰相关损失已观察到驱动大幅改变北极生态系统。本文综述了研究记录的经验之间的联系GCC诱导的流行和在北极海洋生态系统的汞暴露和通路的生态变化和改变。大多数的研究报道在流行或汞浓度变化与GCC引起的物种营养相互作用的变化组织。这些研究通常集中在阿舞的角色变化,栖息地的范围或接近猎物,尤其是在与海冰变化。然而,生态变化,重新适应污染物的趋势变化往往是不清楚或假定。其他的研究已经成功地使用化学示踪剂,如稳定的氮和碳同位素比值和脂肪酸签名连接这样的生态变化,污染物水平的变化或趋势。较低的海冰与饮食变化/变异与较高的污染水平在一些不同的北极熊,以及相关的环斑海豹,和厚嘴默,但改变营养相互作用影响的流行水平和趋势的大小和方向的变化很大。我们建议在这一新领域的GCC链接ECOTOX -生态学的重点应该放在配套的生态指标与流行和汞的研究常规分析未来的研究,同时考虑了GCC和污染物的相互作用可能发生的多种机制,并有针对性地研究变化的暴露和毒性的物种称为敏感的GCC和污染物[现行生态61(4):617-628,2015 ]。Melissa A. MCKINNEY Sara PEDRO Rune DIETZ Christian SONNE Aaron T. FISK Denis ROY Bjorn M. JENSSEN Robert J. LETCHER 2015Current Zoology2015,61,4:7
2Levels and trends of poly-and perfluoroalkyl substances in the Arctic environment-An update显示文摘Poly-and perfluoroalkyl substances(PFASs)are important environmental contaminants globally and in the early 2000s they were shown to be ubiquitous contaminants in Arctic wildlife.Previous reviews by Butt et al.and Letcher et al.have covered studies on levels and trends of PFASs in the Arctic that were available to 2009.The purpose of this review is to focus on more recent work,generally published between 2009 and 2018,with emphasis on PFASs of emerging concern such as perfluoroalkyl carboxylates(PFCAs)and short-chain perfluoroalkyl sulfonates(PFSAs)and their precursors.Atmospheric measurements over the period 2006e2014 have shown that fluorotelomer alcohols(FTOHs)as well as perfluorobutanoic acid(PFBA)and perfluoroctanoic acid(PFOA)are the most prominent PFASs in the arctic atmosphere,all with increasing concentrations at Alert although PFOA concentrations declined at the Zeppelin Station(Svalbard).Results from ice cores show generally increasing deposition of PFCAs on the Devon Ice cap in the Canadian arctic while declining fluxes were found in a glacier on Svalbard.An extensive dataset exists for long-term trends of long-chain PFCAs that have been reported in Arctic biota with some datasets including archived samples from the 1970s and 1980s.Trends in PFCAs over time vary among the same species across the North American Arctic,East and West Greenland,and Svalbard.Most long term time series show a decline from higher concentrations in the early 2000s.However there have been recent(post 2010)increasing trends of PFCAs in ringed seals in the Canadian Arctic,East Greenland polar bears and in arctic foxes in Svalbard.Annual biological sampling is helping to determine these relatively short term changes.Rising levels of some PFCAs have been explained by continued emissions of long-chain PFCAs and/or their precursors and inflows to the Arctic Ocean,especially from the North Atlantic.While the effectiveness of biological sampling for temporal trends in long-chain PFCAs and PFSAs has been demonstrated,this does not apply to the C4eC8ePFCAs,perfluorobutane sulfonamide(FBSA),or perfluorobutane sulfonate(PFBS)which are generally present at low concentrations in biota.In addition to air sampling,sampling abiotic media such as glacial cores,and annual sampling of lake waters and seawater would appear to be the best approaches for investigating trends in the less bioaccumulative PFASs.Derek Muir Rossana Bossi Pernilla Carlsson Marlene Evans Amila De Silva Crispin Halsall Cassandra Rauert Dorte Herzke Hayley Hung Robert Letcher Frank Riget Anna Roos 2019Emerging Contaminants2019,5,1:3
3Dietary accumulation and metabolism of polybrominated diphenyl ethers by juvenile carp (Cyprinus carpio ) 显示文摘Stapleton H M Letcher R J Li J 2004Environmental Toxicology and Chemistry2004,23,:1
4Inhibition and introduction of aromatase activity by brominated flame retardants in H295 human adrenocortical carcinoma cells 显示文摘Canton R F Sanderson J T Letcher R J 2005Toxicological Sciences2005,88,2:1
5Evaluation of antibody immobilization methods for piezoelectric biosensor application显示文摘BABACAN S PIVARNIK P LETCHER S 2000Biosensors and Bioelectronics2000,15,1112:1
6Debromination of the flame retardant decabromodiphenyl ether by juvenile carp ( Cyprinus carpio) following dietary exposure 显示文摘Stapleton H M Alaee M Letcher R J 2004Environmental Science and Technology2004,38,:1
7Enantioselective gas chromatography/mass spectrometry of methylsulfonyl PCBs with application to arctic marine mammals 显示文摘Wiberg K Letcher R Sandau C 1998Anal Chem1998,70,:1
8In vitro estrogenicity ofpolybrominated diphenyl ethers,hydroxylated PDBEs,and polybrominatedbisphenol A compounds显示文摘MEERTS I A LETCHER R J HOVINGS 2001Environ Health Perspect2001,109,4:1
9Highly elevated levels of perfluorooctane sulfonate and other perfluorinated acids found in Biota and surface water downstream of an international airport, Hamilton, Ontario, Canada显示文摘SOLLA S R SILVA A O D LETCHER R J 2012Environmental international2012,39,1:1
10The effect of radiofrequency current and heat on peripheral nerve action potential in the cat显示文摘LETCHER F S GOLDRING S 1968J Neurosurg1968,29,1:1
11Debromination of polybrominated diphenyl ether congeners BDE 99 and BDE 183 in the intestinal tract of the common carp (Cyprinus car- pio) 显示文摘Stapleton H M Letcher R J Baker J E 2004Environmental Science & Technology2004,38,4:1
12Simultaneous determination of tetrabromobisphenol A, tetrachlorobisphenol A, bisphenol A and other halogenated analogues in sediment and sludge by high performance liquid chromatography-electrospray tandem mass spectrometry显示文摘Chu S G Haffner G D Letcher R J 2005J Chromatogr A2005,1097,12:1
13A review of erosion and sediment transport models 显示文摘Merritt W S Letcher R A Jakeman A J 2003Environmental Modelling & Software2003,18,8:1
14Simultaneous determination of tetrabromobisphenol A, tetrachlorobisphenol A, bisphenol A and other halogenated analogues in sediment and sludge by high performance liquid chromatography-electrospray tandem mass spectrometry 显示文摘Chu Shaogang Haffner GD Letcher RJ 2005Journal of Chromatography A2005,1097,:1
15Insulin-like growth factor-Ⅰ expression during early conceptus development in the pig显示文摘Letcher R Simmen RC Bazer FW Simmen FA 0,,06:1
16Debromina- tion of polybrominated diphenyl ether-99 (BDE-99) in carp (Cyprinus carpio) microflora and microsomes 显示文摘Benedict R T Stapleton H M Letcher R J 2007Chemos- phere2007,69,6:1
17The effect of radiofrequency current and heat on peripheral nerve action potential in the cat显示文摘Letcher F S Goldring S 0,,01:1
18Polybrominated diphenyl ethers and their hydroxylated analogues in ringed seals ( Phoca hispida) from svalbard and the Baltic sea显示文摘Routti H Letcher R J Chu S G 2009Envrion Sci Techno12009,43,:1
19A review of erosion and sediment transport models 显示文摘Merritt W S Letcher R A Jakeman A J 2003Environ Modell Software2003,18,89:1
20Metabolism in the toxicokinetics and fate of brominated flame retardants - a review 显示文摘Hakk H Letcher R J 2003Environ- ment International2003,29,6:1
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