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采用GC/MSD DRS对残留农药进行全面筛查应用

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化工文摘 2004年第6期 51-55页

作者： philip L.Wylie Michael J.Szelewski Chin-Kai Meng christopher p.sandy Agilent Technologies Inc

1 前言根据农药手册，目前世界上正在使用的农药有700多种。大约600种农约是过去使用的，但现在已经禁用或不再销售。有一些农药早已不再使用，但它们仍然存在于环境中，还可能在植物和动物体内生物富集。在食品和饮料、在土壤、水和... 详细信息

1 前言根据农药手册，目前世界上正在使用的农药有700多种。大约600种农约是过去使用的，但现在已经禁用或不再销售。有一些农药早已不再使用，但它们仍然存在于环境中，还可能在植物和动物体内生物富集。在食品和饮料、在土壤、水和大气、在水生和陆生的动植物、在人类血液、脂肪组织和乳汁．都能检测到痕量的农药或它们的代谢物。

关键词：农药残留量毒性分析方法污染物色谱

用DRS对加标和未加标水果提取物中农药残留的盲样测试

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卫生研究 2005年第3期34卷 i001-i003页

作者： christopher p.sandy Agilent Technologies lnc. Wokingham Berk RG41 5DZ Unite Kingdom

安捷伦公司的质量选择检测器(MSD)和DRS ,为MSD化学工作站软件增加了有力的数据处理功能。处理全扫描气相色谱质谱数据对农药残留物进行确证,这是一项繁琐、费时的工作,需要有经验的分析人员具备极高的技术、倾注巨大的精力。DRS可以在... 详细信息

安捷伦公司的质量选择检测器(MSD)和DRS ,为MSD化学工作站软件增加了有力的数据处理功能。处理全扫描气相色谱质谱数据对农药残留物进行确证,这是一项繁琐、费时的工作,需要有经验的分析人员具备极高的技术、倾注巨大的精力。DRS可以在1分钟左右处理一张复杂的食品提取物离子色谱图,而有经验的分析人员要得到同样质量的结果可能需要30多分钟。这篇报告中的大量数据说明,分析人员可以用DRS迅速得到高度可信的结果。

关键词： DRS 提取物安捷伦科技质量选择检测器测试盲样水果分析人员农药残留物处理功能气相色谱数据说明工作站 MSD 色谱图

Racial/ethnic disparities in hepatocellular carcinoma treatment and survival in California, 1988-2012

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World Journal of Gastroenterology 2016年第38期22卷 8584-8595页

作者： Susan L Stewart sandy L Kwong christopher L Bowlus Tung T Nguyen Annette E Maxwell Roshan Bastani Eric W Chak Moon S Chen Jr Division of Biostatistics Department of Public Health SciencesUniversity of CaliforniaDavis School of Medicine Sacramenio CA 95817 United States California Department of public Health Sacramenio CA 95817 United States Tung Division of Gastroenterology and Hepatology Department of Internal MedicineUniversity of CaliforniaDavis School of Medicine Sacramenio CA 95817 United States Division of General Internal Medicine University of California San Francisco CA 94101 United States UCLA Kaiser permanente Center for Health Equity Fielding School of Public Health and Jonsson Comprehensive Cancer CenterUniversity of California Los Angeles CA 90095 United States Division of Hematology and Oncology Department of Internal MedicineUniversity of CaliforniaDavis School of MedicineSacramento CA 95817 United States Cancer Control/Cancer Health Disparities University of CaliforniaDavis Comprehensive Cancer CenterSacramento CA 95817 United States

AIM To describe racial/ethnic differences in treatment and survival among liver cancer patients in a populationbased cancer *** Invasive cases of primary hepatocellular carcinoma, n = 33270, diagnosed between January 1, 1988-December 31, 2012 and reported to the California Cancer Registry were analyzed by race/ethnicity, age, gender, geographical region, socio-economic status, time period of diagnosis, stage, surgical treatment, and survival. patients were classified into 15 racial/ethnic groups: non-Hispanic White(White, n = 12710), Hispanic(n = 8500), Chinese(n = 2723), non-Hispanic Black(Black, n = 2609), Vietnamese(n = 2063), Filipino(n = 1479), Korean(n = 1099), Japanese(n = 658), American Indian/Alaskan Native(AIAN, n = 281), Laotian/Hmong (n = 244), Cambodian(n = 233), South Asian(n = 190), Hawai`ian/pacific Islander(n = 172), Thai(n = 95), and Other Asian(n = 214). The main outcome measures were receipt of surgical treatment, and cause-specific and all-cause *** After adjustment for socio-demographic characteristics, time period, and stage of disease, compared to Whites, Laotian/Hmong [odds ratio(OR) = 0.30, 95%CI: 0.17-0.53], Cambodian(OR = 0.65, 95%CI: 0.45-0.96), AIAN(OR = 0.66, 95%CI: 0.46-0.93), Black(OR = 0.76, 95%CI: 0.67-0.86), and Hispanic(OR = 0.78, 95%CI: 0.72-0.84) patients were less likely, whereas Chinese(OR = 1.58, 95%CI: 1.42-1.77), Koreans(OR = 1.45, 95%CI: 1.24-1.70), Japanese(OR = 1.41, 95%CI: 1.15-1.72), and Vietnamese(OR = 1.26, 95%CI: 1.12-1.42) were more likely to receive surgical treatment. After adjustment for the same covariates and treatment, cause-specific mortality was higher for Laotian/Hmong [(hazard ratio(HR) = 1.50, 95%CI: 1.29-1.73)], Cambodians(HR = 1.35, 95%CI: 1.16-1.58), and Blacks(HR = 1.07, 95%CI: 1.01-1.13), and lower for Chinese(HR = 0.82, 95%CI: 0.77-0.86), Filipinos(HR = 0.84, 95%CI: 0.78-0.90), Vietnamese(HR = 0.85, 95%CI: 0.80-0.90), Koreans(HR = 0.90, 95%CI: 0.83-0.97), and Hispanics(H

关键词： Disparities Treatment Survival Liver cancer Hepatocellular carcinoma

Modeling the impact of climate change on sediment transport and morphology in coupled watershed-coast systems:A case study using an integrated approach

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International Journal of Sediment Research 2014年第3期29卷 304-315页

作者： Achilleas G.SAMARAS christopher G KOUTITAS Research Fellow CIRI-ECFluid Dynamics Research UnitUniversity of BolognaVia del Lazzaretto 15/5Bologna 40131Italy Department of Civil Engineering Aristotle University of ThessalonikiUniversity Campus

Climate change is an issue of major concern *** impact on the natural and human environment is studied intensively,as the expected shift in climate will be significant in the next few *** experience shows that the effects will be critical in coastal areas,resulting in erosion and inundation phenomena *** addition to that,coastal areas are subject to "pressures" from upstream watersheds in terms of water quality and sediment *** present paper studies the impact of climate change on sediment transport and morphology in the aforementioned coupled *** study regards a sandy coast and its upstream watershed in Chalkidiki,North Greece;it is based on:(a)an integrated approach for the quantitative correlation of the two through numerical modeling,developed by the authors,and(b)a calibrated application of the relevant models Soil and Water Assessment Tool(SWAT)and pELNCON-M,applied to the watershed and the coastal zone,*** examined climate change scenarios focus on a shift of the rainfall distribution towards fewer and more extreme rainfall events,and an increased frequency of occurrence of extreme wave *** indicate the significance of climatic pressures in wide-scale sediment dynamics,and are deemed to provide a useful perspective for researchers and policy planners involved in the study of coastal morphology evolution in a changing climate.

关键词： Climate change Sediment transport Coastal morphology Integrated approach Numerical modeling

采用GC/MSD DRS对残留农药进行全面筛查

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现代科学仪器 2006年第1期 13-17页

作者： philip L. Wylie Michael J. Szelewski Chin-Kai Meng christopher p. sandy Agilent Technologies Inc.2850Centerville Road WilmingtonDE 19808-1610 USA Agilent Technologies Inc.Block ACSC Eskdale Road Winnersh Triangle Estate Wokingham Berk RG415DZ United Kingdom

1引言根据农药手册,目前世界上正在使用的农药有700多种[1].大约600种农药是过去使用的,但现在已经禁用或不再销售.有一些农药早已不再使用,但它们仍然存在于环境中,还可能在植物和动物体内生物富集.在食品和饮料、在土壤、水和大气、... 详细信息

1引言根据农药手册,目前世界上正在使用的农药有700多种[1].大约600种农药是过去使用的,但现在已经禁用或不再销售.有一些农药早已不再使用,但它们仍然存在于环境中,还可能在植物和动物体内生物富集.在食品和饮料、在土壤、水和大气、在水生和陆生的动植物、在人类血液、脂肪组织和乳汁中,都能检测到痕量的农药或它们的代谢物.

关键词：保留时间锁定农药内分泌干扰物安捷伦 AMDIS NIST 数据库 RTL 化学污染物数据库系统 DRS 质谱图 MSD 筛查

用GC/MSD DRS对残留农药进行全面筛查的应用

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农业质量标准 2006年第1期 19-23页

作者： philip L. Wylie Michael J. Szelewski Chin-Kai Meng christopher p. sandy Agilent Technologies Inc.WilmingtonDE 19808-1610 USA 不详

世界卫生组织根据农药对人的急性毒性将农药分成5类[1],其类别从'有急性毒性'到'正常使用时没有急性毒性',一些农药被归之为持久性有机污染物(pOp),致癌、致畸或内分泌干扰物.分析食品和环境样品中的农药,跟踪它们在环境中的分布以保证... 详细信息

世界卫生组织根据农药对人的急性毒性将农药分成5类[1],其类别从'有急性毒性'到'正常使用时没有急性毒性',一些农药被归之为持久性有机污染物(pOp),致癌、致畸或内分泌干扰物.分析食品和环境样品中的农药,跟踪它们在环境中的分布以保证食品安全,是一项经常工作.目前,很多分析方法仅针对一部分可能存在的化合物,然而无论是食品还是环境样品,由于其中一些天然产物能够被一起提取出来,致使分析工作变得复杂起来.因此,在分析之前需要进行若干样品净化步骤[2],但即便如此,在残余基质存在的情况下检测痕量的污染物也很困难.

关键词：残留农药持久性有机污染物 DRS 应用筛查急性毒性世界卫生组织内分泌干扰物食品安全环境样品

Spatio-temporal analysis of flowering using Li DAR topography

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Journal of Geographical Sciences 2017年第1期27卷 62-78页

作者： HART Samantha MIKHAILOVA Elena pOST christopher Mc MILLAN patrick SHARp Julia BRIDGES William Department of Forestry and Environmental Conservation Clemson University SC 29634 USA Department of Mathematical Sciences Clemson University SC 29634 USA

Spatio-temporal patterns of flowering in forest ecosystems are hard to quantify and monitor. The objectives of this study were to investigate spatio-temporal patterns（e.g. soilssimple slope classesslope aspectand flow accumulation） of flowering around Lake IssaqueenaSouth Carolina（SCUSA） using plant-flowering database collected with GpS- enabled camera（stored in picasa 3 web albums and project website） on a monthly basis in 2012 and Li DAR-based topography. pacolet fine sandy loam had the most flowering plantsfollowed by Madison sandy loamboth dominant soil types around the lake. Most flowering plants were on moderately steep（17%–30%） and gently sloping（4%–8%） slopes. Most flowering plants were on west（247.5°–292.5°）southwest（202.5°–247.5°）and northwest（292.5°–337.5°） aspects. Most flowering plants were associated with minimum and maximum flows within the landscape. Chi-square tests indicated differences in the distributions of the proportions of flowering plants were significant by soil typeslopeaspectand flow accumulation for each month（February-November）for all months（overall）and across months. The Chi-square test on area-normalized data indicated significant differences for all months and individual differences by each month with some months not statistically significant. Cluster analysis on flowering counts for nine plant families with the most flowering counts indicated no unique separation by clusterbut implied that the majority of these families were flowering on strongly sloping（9%–16%） slopeson southwest（202.5°–247.5°） aspectsand low flow accumulation（0–200）. presented methodology can serve as a template for future efforts to quantify spatio-temporal patterns of flowering and other phenological events.

关键词： aspect flow accumulation Geographic Information Systems(GIS) phenology soils

The road home: Returning to pre-Katrina homes during episodes of psychosis

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Open Journal of psychiatry 2013年第1期3卷 1-4页

作者： Gayle pletsch christopher Rodgman Elizabeth Leimbach Kelly Erwin Janet Johnson Albert Einstein College of Medicine Department of Psychiatry and Behavioral Sciences New York USA Tulane University School of Medicine Department of Psychiatry and Behavioral Sciences New Orleans USA

Hurricane Katrina was a devastating event to New Orleans. There was a mandatory evacuation of the city during which victims in affected areas were not allowed to return for months. Many residents were unable to return to their previous residence due to the destruction of their home or change in ownership. In its aftermath, a phenomenon of displaced residents becoming psychotic and returning to their pre-Katrina homes that they no longer owned became apartment. While the clinical ramifications of these behaviors remain unclear, in the wake of Hurricane sandy monitoring of psychotic patients for similar behaviors may be warranted. We present two such cases of this phenomenon, colloquially called “post-Katrina Syndrome” by psychiatrists in the New Orleans area.

关键词： Hurricane Katrina psychosis pTSD Dissociative Fugue

Characterization of Alluvial Gold Bearing Sediments of Betare Oya District-East Cameroon, Implication for Gold Exploration and Recovery

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Open Journal of Geology 2017年第11期7卷 1724-1738页

作者： Germain Marie Monespérance Mboudou Kennedy Folepai Fozao Olivier Annoh Njoh christopher Mbaringong Agyingi Economic Geology Unit Department of Geology University of Buea Buea Cameroon Sedimentology and petroleum Geolgy/Engineering Unit Department of Geology University of Buea Buea Cameroon

Field studies (location Au pits, sampling of different layers of sedimentary sequences filling the pits, panning of sediments), litho-stratigraphic investigations, grain size analysis and outlining of depositional conditions revealed a characteristic fining upward sequence in all the sections of 08 Au-pits within the Betare Oya basin. A typical profile is 2.5 to 4.5 m thick and is composed of a 30 to 50 cm organic topsoil layer, underlain by a 1.5 m thick reddish brownish gold free saprolite, which is underlain by 1.5 m sandy section. From litho-stratigraphic investigations and grain size analysis results a quartz dominated gravelly 1.4 m thick layer consisting in boulders (275 mm), cobbles (2-−0.0148x2 + 1.2187x + 2.0344, R2 = 0.6929 (sandy layer);2) y = 0.0617x2 + 1.0849x + 0.8097, R2 = 0.8694 (gravelly layer);and y > R2 is satisfied in both cases. This implies that Au recovery from these layers could be effective through gravity separation using sieves mounted on classifiers of 7 cm (sandy layer) and 10 cm (gravelly layer) diameter.

关键词： Betare Oya Aspect Ratios Au Grains Yield Alluvial Sediments pull-Apart Basin