检索结果-南通市图书馆

Journal of Integrative Plant Biology 2008年第11期50卷 1388-1395页

作者： Joy K.Ward david a.myers Richard B.Thomas Department of Ecology and Evolutionary Biology University of Kansas Department of Biology West Virginia University

During the last ice age, CO2 concentration （[CO2]） was 180-200 umol/mol compared with the modern value of 380 umol/mol, and global temperatures were -8 ℃ cooler. Relatively little is known about the responses of C3 and C4 species to longterm exposure to glacial conditions. Here Abutilon theophrasti Medik. （C3） and Amaranthus retroflexus L. （C4） were grown at 200 umol/mol CO2 with current （30/24℃） and glacial （22/16℃） temperatures for 22d. Overall, the C4 species exhibited a large growth advantage over the C3 species at low [CO2]. However, this advantage was reduced at low temperature, where the C4 species produced 5x the total mass of the C3 species versus 14x at the high temperature. This difference was due to a reduction in C4 growth at low temperature, since the C3 species exhibited similar growth between temperatures. Physiological differences between temperatures were not detected for either species, although photorespiration/net photosynthesis was reduced in the C3 species grown at low temperature, suggesting evidence of improved carbon balance at this treatment. This system suggests that C4 species had a growth advantage over C3 species during low [CO2] of the last ice age, although concurrent reductions in temperatures may have reduced this advantage.

关键词： Abutilon theophrasti Amaranthus retroflexus C3 species C4 species climate change low CO2 low temperature photorespiration Pleistocene.

Tree mycorrhizal associations determine how biodiversity,large trees,and environmental factors drive aboveground carbon stock in temperate forests

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2024年第4期11卷 448-456页

作者： Yue Chen Zikun Mao Jonathan a.myers Jinghua Yu Xugao Wang CAS Key Laboratory of Forest Ecology and Silviculture Institute of Applied EcologyChinese Academy of SciencesShenyang110016China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of Terrestrial Ecosystem Carbon Neutrality Shenyang110016China Department of Biology Washington University in St.LouisSt.LouisMissouriUSA

Biodiversity,large trees,and environmental conditions such as climate and soil have important effects on forest carbon ***,recent studies in temperate forests suggest that the relative importance of these factors depends on tree mycorrhizal associations,whereby large-tree effects may be driven by ectomycorrhizal(EM)trees,diversity effects may be driven by arbuscular mycorrhizal(AM)trees,and environment effects may depend on differential climate and soil preferences of AM and EM *** test this hypothesis,we used forest-inventory data consisting of over 80,000 trees from 631 temperate-forest plots(30 m×30 m)across Northeast China to examine how biodiversity(species diversity and ecological uniqueness),large trees(top 1%of tree diameters),and environmental factors(climate and soil nutrients)differently regulate aboveground carbon stocks of AM trees,EM trees,and AM and EM trees combined(*** aboveground carbon stock).We found that large trees had a positive effect on both AM and EM tree carbon ***,biodiversity and environmental factors had opposite effects on AM *** tree carbon ***,the two components of biodiversity had positive effects on AM tree carbon stocks,but negative effects on EM tree carbon *** heterogeneity(mean annual temperature and soil nutrients)also exhibited contrasting effects on AM and EM tree carbon ***,for the total carbon stock,the positive large-tree effect far surpasses the diversity and environment *** is mainly because when integrating AM and EM tree carbon stock into total carbon stock,the opposite diversity-effect(also environment-effect)on AM *** tree carbon stock counteracts each other while the consistent positive large-tree effect on AM and EM tree carbon stock is *** summary,this study emphasized a mycorrhizal viewpoint to better understand the determinants of overarching aboveground carbon profile across regional forests.

关键词： Biodiversity Ecological uniqueness Environment heterogeneity Large trees Mycorrhizal associations Tree carbon stock

Evaluation of the Validity of the Ratsnake Subspecies Elaphe carinata deqenensis(Serpent:Colubridae)

在线全文

学校读者我要写书评

暂无评论

Asian Herpetological Research 2012年第3期3卷 219-226页

作者： Peng GUO Qin LIU Edward a.myers Shaoying LIU Yan XU Yang LIU Yuezhao WANG College of Life Sciences and Food Engineering Yibin University Department of Biology Graduate School and University CenterCity University of New York Department of Biology College of Staten IslandCity University of New York Sichuan Academy of Forestry Chengdu University of Technology Chengdu Institute of Biology Chinese Academy of Sciences

Based on morphological character comparisons and molecular phylogenetic reconstruction, we assessed the validity of the ratsnake subspecies Elaphe carinata deqenensis. Phylogenetic relationships inferred from fragments of two mitochondrial genes(ND2 and ND4) and one nuclear gene(c-mos) revealed a well-supported and minimally divergent sister relationship between putative E. c. deqenensis and E. c. carinata. Morphological comparisons indicated that all diagnostic characters proposed in the original description of E. c. deqenensis are unable to separate this taxon from E. c. carinata. On the basis of these preliminary investigations, we provisionally suggest that E. c. deqenensis is not a valid subspecies, and should henceforth be treated as a synonym of E. c. carinata.

关键词： snake Colubrinae morphology hemipenis molecular phylogeny Hengduan Mountains

Social psychology / david G. myers. 9th ed.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

2008年

作者： david G. myers.

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

谷物的储存与品质维护

中国畜牧杂志 2010年第6期46卷 52-54页

作者：武书庚 Mark a.myers 中国农业科学院饲料研究所北京100081 美国Brock Manufacturing

仓储谷物品质的维持主要依赖于温度探测系统和通风系统。温度探测系统是与特殊电缆相连接的电子读数设备，悬吊在储存谷物的仓顶。实际中，可根据储存仓直径的大小，设置1根或多根这种电缆。该电缆的温度传感器垂直伸入谷物2m左右，因... 详细信息

仓储谷物品质的维持主要依赖于温度探测系统和通风系统。温度探测系统是与特殊电缆相连接的电子读数设备，悬吊在储存谷物的仓顶。实际中，可根据储存仓直径的大小，设置1根或多根这种电缆。该电缆的温度传感器垂直伸入谷物2m左右，因谷物的温度变化较慢，一般每周记录一次读数。如果储存的谷物不同位置的温度不同，可能表明谷物正受到损伤，这时就需要采取措施。

关键词：谷物品质储存仓维护通风系统温度探测温度传感器温度变化电缆

Social Psychology david G. myers 7th ed.

在线全文

学校读者我要写书评

暂无评论

Investigation of potential Shiga toxin producing Escherichia coli(STEC)associated with a local foodborne outbreak using multidisciplinary approaches

2002年

作者： david G. myers

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2016年第3期5卷 163-168页

作者： Kristen A.Lozinak Niketa Jani Jayanthi Gangiredla Isha Patel Christopher A.Elkins Zonglin Hu Prince A.Kassim Robert a.myers Pongpan Laksanalamai Laboratories Administration Maryland Department of Health and Mental Hygiene1770 Ashland Ave.BaltimoreMD 21205United States Office of Applied Research and Safety Assessment Center for Food Safety and Applied NutritionUS Food and Drug Administration8301 Muirkirk Rd.LaurelMD 20708United States Winchester Engineering and Analytical Center Office of Regulatory AffairsUS Food and Drug Administration109 Holton St.WinchesterMA 01890United States

Shiga toxin producing Escherichia coli(STEC)outbreak is a public health concern as it can potentially cause a variety of clinical manifestations including diarrhea,hemorrhagic colitis and hemolytic uremic syndrome(HUS).However *** are generally innocuous commensal organisms,and there is a need to discriminate pathogenic from non-pathogenic isolates rapidly and *** this study,we have used standard culture based methods and advanced molecular approaches to characterize *** in food in a local outbreak *** show that the application of DNA based detection methods including real-time PCR and DNA microarray along with a traditional culture method can identify the organism implicated in an outbreak at the strain level for pathogenic potential.

关键词： STEC diarrhea culture

在线全文

学校读者我要写书评

暂无评论

NEMO卫星敏感器成像有效载荷

红外 2001年第5期22卷 18-25页

作者： William a.myers 高国龙美国科学应用国际公司

名为海军地球绘图观测器(NEMO)的卫星的敏感成像有效载荷由一台超光谱成像仪和一台共准直的全色成像仪组成。这两台敏感器的地面刈幅均为30 km,其中超光谱成像仪的地面采样距离为 30m(或采用像元分级时为60 m),全色成像仪的地面采样距离... 详细信息

名为海军地球绘图观测器(NEMO)的卫星的敏感成像有效载荷由一台超光谱成像仪和一台共准直的全色成像仪组成。这两台敏感器的地面刈幅均为30 km,其中超光谱成像仪的地面采样距离为 30m(或采用像元分级时为60 m),全色成像仪的地面采样距离为5m。超光谱成像仪的工作区域为0.4 μm-2.5μm,其光谱分辨率为10mm,全色成像仪有一个0.49μm-0.69μm带通。该有效载荷的重量不到61 kg,平均功率小于90W,设计飞行寿命为5年。

关键词：短波红外超光谱成像仪全色成像仪海军地球绘图观测器卫星敏感器有效载荷 NEMO

Surface plasma treatment effects on the molecular structure at polyimide/air and buried polyimide/epoxy interfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2015年第4期26卷 449-454页

作者： John N.myers Zhan Chen Department of Chemistry University of Michigan

Polyimides are widely used as chip passivation layers and organic substrates in microelectronic packaging. Plasma treatment has been used to enhance the interfacial properties of polyimides, but its molecular mechanism is not clear. In this research, the effects of polyimide surface plasma treatment on the molecular structures at corresponding polyimide/air and buried polyimideJepoxy interfaces were investigated in situ using sum frequency generation （SFG） vibrational spectroscopy. SFG results show that the polyimide backbone molecular structure was different at polyimide/air and polyimideJepoxy interfaces before and after plasma treatment. The different molecular structures at each interface indicate that structural reordering of the polyimide backbone occurred as a result of plasma treatment and contact with the epoxy adhesive. Furthermore, quantitative orientation analysis indicated that plasma treatment of polyimide surfaces altered the twist angle of the polyimide backbone at corresponding buried polyimide/epoxy interfaces. These SFG results indicate that plasma treatment of polymer surfaces can alter the molecular structure at corresponding polymer/air and buried polymer interfaces.

关键词： Molecular structureVibrational spectroscopySum frequency generation spectroscopy

Non-exercise estimated cardiorespiratory fitness and cancer incidence:The NIH-AARP diet and health study

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2023年第6期12卷 739-746页

作者： Baruch Vainshelboim Jonathan myers Charles EMatthews Center for Tobacco Research Division of Medical OncologyDepartment of Internal MedicineThe Ohio State UniversityColumbusOH 43214USA Cardiology Division Veterans Affairs Palo Alto Health Care System/Stanford UniversityPalo AltoCA 94304USA Metabolic Epidemiology Branch Division of Cancer Epidemiology and GeneticsNational Cancer InstituteRockvilleMD 20850USA

Background Non-exercise estimated cardiorespiratory fitness(NEE-CRF)has been shown to be associated with mortality,although its association with cancer incidence is *** study aimed to assess the prospective association between NEE-CRF and cancer incidence in a large cohort of men and *** The National Institutes of Health-American Association of Retired Persons diet and health study is a prospective cohort that included 402,548 participants aged 50–71 years who were free from cancer at baseline(1995–1996)(men(n=238,835)and women(n=163,713))and were followed until December 31,*** exposure variable was NEE-CRF expressed in metabolic ***-CRF was estimated using a validated equation of self-reported predictors on demographics and lifestyle behaviors derived from baseline *** outcomes were total cancer incidence and incidence of prostate,breast,lung,and colorectal *** proportional hazards models were analyzed for the association between NEE-CRF and cancer incidence outcomes adjusted for established cancer risk *** During 13.7±3.2 years of follow-up(mean±SD),64,344 men and 31,315 women developed a new *** every 1-metabolic equivalent higher NEE-CRF,the hazard ratios and 95%confidence intervals(95%CIs)were 0.96(95%CI:0.94–0.97)and 0.88(95%CI:0.84–0.92)of total and colorectal cancer incidence among men,and 0.95(95%CI:0.93–0.97)and 0.94(95%CI:0.91–0.97)of total and breast cancer incidence among women,respectively(all p<0.001).NEE-CRF was not associated with incidence of prostate and lung cancers in men or colorectal and lung cancers in *** These results suggest that higher CRF levels,as assessed by the applied non-exercise estimated method,may provide preventive benefits against the development of cancer,while low CRF could potentially serve as a modifiable cancer risk *** NEE-CRF into screening paradigms and referring low-fit individuals to improve CRF could complemen

关键词： Aerobic capacity Breast cancer Cancer risk Colorectal cancer VO_(2max)