检索结果-南通市图书馆

Role of permafrost in resilience of social-ecological system and its spatio-temporal dynamics in the source regions of Yangtze and Yellow Rivers

引用

Journal of Mountain Science 2019年第1期16卷 179-194页

作者： FANG yi-ping ZHU Fu-biao yi shu-hua QIU Xiao-ping DING Yong-jian Institute of Mountain Hazards and Environment Chinese Academy of Sciences College of Resource and Environment University of Chinese Academy of Sciences School of Economics Hefei University of Technology School of Geographic Sciences Nantong University College of Geography and Resources Science Sichuan Normal University State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences

Permafrost is one of the key components of terrestrial ecosystem in cold regions. In the context of climate change, few studies have investigated resilience of social ecological system(SER) from the perspective of permafrost that restricts the hydrothermal condition of alpine grassland ecosystem. In this paper, based on the structural dynamics, we developed the numerical model for the SER in the permafrost regions of the source of Yangtze and Yellow Rivers, analyzed the spatial-temporal characteristics and sensitivity of the SER, and estimated the effect of permafrost change on the SER. The results indicate that: 1) the SER has an increasing trend, especially after 1997, which is the joint effect of precipitation, temperature, NPP and ecological conservation projects; 2) the SER shows the spatial feature of high in southeast and low in northwest,which is consistent with the variation trends of high southeast and low northwest for the precipitation, temperature and NPP, and low southeast and high northwest for the altitude; 3) the high sensitive regions of SER to the permafrost change have gradually transited from the island distribution to zonal and planar distribution since 1980, moreover, the sensitive degree has gradually reduced; relatively, the sensitivity has high value in the north and south, and low value in the south and east; 4) the thickness of permafrost active layer shows a highly negative correlation with the SER. The contribution rate of permafrost change to the SER is-4.3%, that is, once the thickness of permafrost active layer increases 1 unit, the SER would decrease 0.04 units.

关键词： Resilience of social ecological system Permafrost Permafrost active layer thickness Structural dynamic equation Source regions of Yangtze and Yellow rivers

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and Crystal Structure of a Novel 1D Magnesium(II) Coordination Polymer Constructed by L-Cysteic Acid

引用

Chinese Journal of Structural Chemistry 2007年第8期26卷 907-910页

作者： LI Hai-Ye LIAO Bei-Ling JIANG yi-Min ZHANG shu-hua LI Jun-Xia College of Chemistry and Chemical Engineering Guangxi Normal University Guilin 541004 China

A novel coordination polymer [Mg（L）（H2O）2]·H2O] （LH2=L-cysteic acid） has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray *** crystal crystallizes in orthorhombic system, space group P212121, with a=5.962（3）, b=11.224（6）, c=13.664（7）A, V=914.3（8）A^3, Z=4, Mr=245.50, Dc=1.783 g/cm^3,μ=0.445 mm-1,flack parameter=0.32（16）, F（000）=512, the final R=0.0458 and wR=0.1172 for 1578 observed reflections with I 〉 2σ（Ⅰ）. The Mg（Ⅱ） atom shows an octahedral geometry defined by two carboxyl O atoms from two different L-cysteic acid ligands, one carboxyl O atom and one amino N atom from the adjacent ligand, and two aqua ligands. The Mg（Ⅱ） atoms are bridged by L-cysteic acid ligands, leading to a 1D infinite zigzag chain. In the structure there are extensive hydrogen bonds,through which the complex completes its 3D framework structure.

关键词： magnesium(Ⅱ) complex L-cysteic acid synthesis crystal structure

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Modeling the carbon dynamics of alpine grassland in the Qinghai-TibetanPlateau under scenarios of 1.5 and 2 ℃ global warming

引用

Advances in Climate Change Research 2019年第2期10卷 80-91页

作者： yi shu-hua XIANG Bo MENG Bao-Ping WU Xiao-Dong DING Yong-Jian Instiute o f Fragile Ecosystem and Environment Nantong University Nantong 226007 China of Geographic Sciences Nantong University Nantong 226007 China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou 730000 China Chongqing Climate Center Chongqing 401147 China Cryosphere Research Station on the Qinghai-Tibetan Plateau Lanzhou 730000 China Key Laboratory of Ecohydrology of Inland River Basin Chinese Academy of Sciences Lanzhou 730000 China University of Chinese Academy Sciences Beijing 100049 China

Alpine grassland occupies two-thirds of the Qinghai-Tibetan Plateau (QTP). It is vital to project changes of this vulnerable ecosystem under different climate change scenarios before taking any mitigation or adaptation measures. In this study, we used a process-based ecosystem model, driven with output from global circulation models under different Representative Concentration Pathways (RCPs), to project the carbon dynamics of alpine grassland. The results showed the following: 1) Vegetation carbon (C) on the QTP increased by 22—38 gC m^-2 during periods of 1.5 and 2 ℃ warming under different RCPs when compared to the baseline period (1981—2006), while soil C increased by 85—122 gC m^-2. 2) The increases of vegetation C and soil C at the period of 1.5 ℃ warming were about 15 gC m^-2 and 40 gC m^-2 smaller than those at the period of 2 ℃ warming, respectively;increase of C was greater for alpine meadow than for alpine steppe. 3) Precipitation, radiation, and permafrost changed significantly and showed heterogeneous spatial patterns, and caused heterogeneous response of C dynamics. For alpine meadow in regions transformed from permafrost to seasonally frozen soil with medium annual precipitation (200—400 mm), vegetation C and net primary production decreased by 18.7 gC m-2 and 3.1 gC m^-2 per year during 2 °C warming under RCP 4.5, respectively. This decrease can be attributed to the disappearing impermeable permafrost. Different from previous studies that indicated an unfavorable response of alpine grassland to climate warming, this study showed a relatively favorable response, which is mainly attributed to C 0 2 fertilization.

关键词： Permafrost Terrestrial ecosystem model Vegetation Soil Net primary production

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An ecosystem services zoning framework for the permafrost regions of China

引用

Advances in Climate Change Research 2019年第2期10卷 92-98页

作者： XU Ling-Xing YANG De-Wei WU Tong-hua yi shu-hua FANG yi-Ping XIAO Cun-De LIN Hao-Xi huaNG Jin-Chuan Claudien HABIMANA SIMBI Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China College o f Resources and Environment University of Chinese Academy of Sciences Beijing 100049 China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources Chinese Academ of Sciences Lanzhou 730000 China Institute of Fragile Ecosystem and Environment Nantong University Nantong 226007 China School of Geographic Sciences Nantong University Nantong 226007 China Institute of Mountain Hazards & Environment Chinese Academy of Sciences Chengdu 61004L China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of Sciences Beijing 100101 China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

The degradation of the permafrost regions, resulting from intensive anthropogenic activities and global warming, has led to the loss of ecosystem services and is threating human well-being. Nevertheless, the real ecosystem service values and their complete zoning system in the permafrost regions have received insufficient attention. Research gaps between the identification of permafrost-based ecosystem services and ecosystem management are seriously constraining the development of cryospheric science. Thus, an ecosystem service zoning framework that links ecosystem services with human welfares is proposed to solve the abovementioned challenges in the permafrost regions of China. The three tiered zoning framework for ecosystem services, consisting of zoning goals, principles, hierarchy, methodology, and nomenclature, is proposed for the permafrost regions of China. A combined method, i.e., GIS spatial tools, the location entropy analysis model, and ecosystem services assessment, was employed to distinguish ecosystem conditions, ecosystem service supply, and beneficiaries into these three-grade ecosystem service zones. Hierarchical and dynamic zoning could clarify protection priorities of ecosystems and ecosystem services in terms of regions, grades, and types. The framework could contribute to sustainable management of ecosystem services in the cryosphere.

关键词： Demand Ecosystem services Ecological zoning Permafrost Supply

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

江河源区高寒草地畜牧业生态效率及影响因素

引用

中国环境科学 2017年第1期37卷 310-318页

作者：朱付彪方一平宜树华虞虎中国科学院水利部成都山地灾害与环境研究所四川成都610041 中国科学院大学北京100049 中国科学院寒区旱区环境与工程研究所甘肃兰州730000 中国科学院地理科学与资源研究所北京100101

以江河源区为案例地,结合超效率DEA和Malmquist DEA模型考察高寒草地畜牧业生态效率时空变化,并分析其影响因素.结果表明:生态效率空间差异明显.2013年玉树、称多和囊谦超效率值较高,达日、玛多和唐古拉山镇超效率值较低,其他各县生态... 详细信息

以江河源区为案例地,结合超效率DEA和Malmquist DEA模型考察高寒草地畜牧业生态效率时空变化,并分析其影响因素.结果表明:生态效率空间差异明显.2013年玉树、称多和囊谦超效率值较高,达日、玛多和唐古拉山镇超效率值较低,其他各县生态效率水平介于两者之间.生态效率动态变化可以划分3个阶段,1994-2002年为平稳上升阶段,2003-2006年为分化阶段,2007-2013年为急剧上升阶段.生态效率上升主要源于技术进步和规模效率提升,资本、降水和劳动力则是主要影响因素.需加大科技投入,提高技术和管理水平,提高劳动者素质;加强草原水利设施、人工草地和畜棚建设;加强草地生态和冻土保护,并完善畜牧业发展政策.

关键词：草地畜牧业生态效率 DEA 冻土气候变化江河源区

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高通量技术在淋巴瘤中的应用：第54届美国血液学会年会报道

引用

白血病．淋巴瘤 2013年第1期22卷 19-20页

作者：易树华邱录贵中国医学科学院北京协和医学院血液病医院血液学研究所天津300020

自从人类基因组密码被破译以来，基于全基因组的高通量技术发展迅速，这些高通量技术在肿瘤领域的成功应用为淋巴瘤发病机制、新药研发带来革命性的变化。继基因表达谱和二代全基因组测序技术分别在弥漫大B细胞淋巴瘤和毛细胞白血病及... 详细信息

自从人类基因组密码被破译以来，基于全基因组的高通量技术发展迅速，这些高通量技术在肿瘤领域的成功应用为淋巴瘤发病机制、新药研发带来革命性的变化。继基因表达谱和二代全基因组测序技术分别在弥漫大B细胞淋巴瘤和毛细胞白血病及华氏巨球蛋白血症中取得重大发现后，研究者继续将基于全基因组的不同高通量技术应用于各类淋巴瘤发病机制、预后等的研究，研究成果在2012年第54届美国血液学会（ASH）年会上被大量报道。

关键词：淋巴瘤高通量技术美国血液学会年会

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TOSO interacts with SYK and enhances BCR pathway activation in chronic lymphocytic leukemia

引用

Chinese Medical Journal 2020年第17期133卷 2090-2097页

作者： Yan-Ru Zhang Zhen Yu Wen-Jie Xiong Xu-Xiang Liu Hui-Min Liu Rui Cui Qi Wang Wen-Ming Chen Lu-Gui Qiu shu-hua yi State Key Laboratory of Experimental Hematology National Clinical Research Center for Blood DiseasesInstitute of Hematology and Blood Disease HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300020China Department of Hematology Beijing Chao Yang Hospital Affiliated to Capital Medical UniversityBeijing 100043China Department of Pathology City of Hope National Medical CenterDuarte 91010CAUSA Department of Hematology Tianjin First Center HospitalTianjin 300192China

Background:TOSO,also named Fas inhibitory molecule 3(FAIM3),has recently been identified as an immunoglobulin M(IgM)Fc receptor(FcμR).Previous studies have shown that TOSO is specifically over-expressed in chronic lymphocytic leukemia(CLL).However,the functions of TOSO in CLL remain *** B-cell receptor(BCR)signaling pathway has been reported to be constitutively activated in ***,we aimed to investigate the functions of TOSO in the BCR signaling pathway and the pathogenesis of ***:We over-expressed TOSO in B-cell lymphoma cell lines(Granta-519 and Z138)by lentiviral transduction and knocked down TOSO by siRNA in primary CLL *** over-expression and knockdown of TOSO were confirmed at the RNA level by polymerase chain reaction and protein level by Western ***-immunoprecipitation with TOSO antibody followed by liquid chromatography coupled with tandem mass spectrometry(IP/LCMS)was used to identify TOSO interacting *** blotting was performed to detect the activation status of BCR signaling pathways as well as B-cell lymphoma 2(BCL-2).Flow cytometry was used to examine the apoptosis of TOSO-over-expressing B lymphoma cell lines and TOSO-down-regulated CLL cells via the staining of Annexin V and ***-way analyses of variance were used for intergroup comparisons,while independent samples t tests were used for two-sample ***:From IP/LCMS,we identified spleen tyrosine kinase(SYK)as a crucial candidate of TOSO-interacting protein and confirmed it by *** stimulation with anti-IgM,TOSO over-expression increased the phosphorylation of SYK,and subsequently activated the BCR signaling pathway,which could be reversed by a SYK *** knockdown in primary CLL cells resulted in reduced SYK phosphorylation as well as attenuated BCR signaling *** apoptosis rates of the Granta-519 and Z138 cells expressing TOSO were(8.46±2.90)%and(4.20±1.21)%,respectively,significantly lower than

关键词： Chronic lymphocytic leukemia TOSO B-cell receptor signaling pathway SYK Apoptosis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

纳米无溶剂环氧防锈漆的制备及性能

引用

材料保护 2017年第3期50卷 54-56,67页

作者：严易舒尹华忠佛山市高明富力特化工有限公司广东佛山528518

为了改善无溶剂环氧涂料的低温施工性及涂膜的耐磨性、柔韧性和耐蚀性,通过对主要组分材料的分析筛选,并采用在涂料A组分中配以复合防锈颜料并加入3%纳米氧化铝、B组分中加入10%二胺扩链剂的方法,制备了一种新型的纳米无溶剂环氧防锈漆... 详细信息

为了改善无溶剂环氧涂料的低温施工性及涂膜的耐磨性、柔韧性和耐蚀性,通过对主要组分材料的分析筛选,并采用在涂料A组分中配以复合防锈颜料并加入3%纳米氧化铝、B组分中加入10%二胺扩链剂的方法,制备了一种新型的纳米无溶剂环氧防锈漆;并对涂料低温施工性以及涂膜耐磨性、柔韧性、耐蚀性等性能进行测试评价。结果表明:在无溶剂环氧涂料体系中采用复合防锈颜料并引入纳米氧化铝及二胺扩链剂,涂料低温施工性改善,涂膜耐磨性、柔韧性及耐蚀性提高。

关键词：无溶剂环氧涂料防锈漆纳米氧化铝二胺扩链剂性能

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

水下分散自重构模块的硬件设计

引用

船海工程 2005年第3期34卷 49-52页

作者：苏一华葛彤连琏上海交通大学船舶海洋与建筑工程学院上海200030

水下分散自重构系统(USS)是一种链式的水下自重构机器人,目前仅包含一种自重构模块(USM-1),由于水下环境的特殊性,该模块具有不同于陆地自重构机器人模块的特点,详细介绍USM-1的硬件设计,并通过试验检验了USM-1运动和自重构的能力。

关键词：水下分散自重构硬件设计

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chronic Lymphocytic Leukemia Prognostic Index： A New Inteorated Scorino System to Predict the Time to First Treatment in Chinese Patients with Chronic Lymphocytic Leukemia

引用

Chinese Medical Journal 2017年第2期130卷 135-142页

作者： Heng Li shu-hua yi Wen-Jie Xiong Hui-Min Liu Rui Lyu Ting-Yu Wang Wei Liu Shi-Zhen Zhong Zhen Yu De-Hui Zou Yan Xu Gang An Zeng-Jun Li Lu-Gui Qiu Department of Lymphoma and Myeloma State Key Laboratory of Experimental Hematology Institute of Hematology and Blood Disease Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Tianjin 300041 China

Background： The established clinical staging systems （Rai/Binet） of chronic lymphocytic leukemia （CLL） cannot accurately predict the appropriate treatment of patients in the earlier stages. In the past two decades, several prognostic factors have been identified to predict the outcome of patients with CLL, but only a few studies investigated more markers together, To predict the time to first treatment （TTFT） in patients of early stages, we evaluated the prognostic role of conventional markers as well as cytogenetic abnormalities and combined them together in a new prognostic scoring system, the CLL prognostic index （CLL-PI）. Methods： Taking advantage of a population of 406 untreated Chinese patients with CLL at early and advanced stage of disease, we identified the strongest prognostic markers of TTFT and, subsequently, in a cohort of 173 patients who had complete data for all 3 variables, we integrated the data of traditional staging system, cytogenetic aberrations, and mutational status of immunoglobulin heavy chain variable region （1GI：tV） in CLL-PI. The median follow-up time was 45 months and the end point was TTFT. Results： The median TTFT was 38 months and the 5-year overall survival was 80%. According to univariate analysis, patients of advanced Rai stages （P 〈 0.001） or with 11q- （P = 0.002）, 17p- （P 〈 0.001）, unmutated IGHV （P 〈 0.001）, negative 13q- （P = 0.007） and elevated lactate dehydrogenase levels （P = 0.001 ） tended to have a significantly shorter TTFT. And subsequently, based on multivariate Cox regression analysis, three independent factors for TTFT were identified： advanced clinical stage （P = 0.002）, 17p- （P = 0.050） and unmutated 1GHV （P = 0.049）. Applying weighted grading of these independent factors, a CLL-PI was constructed based on regression parameters, which could categorize tbur different risk groups （low risk [score 0], intermediate low [score 1], intermediate high [score 2] and high risk [score 3-6]） with significantly different TTFT （

关键词： 17p Deletion Chronic Lymphocytic Leukemia Immunoglobulin Heavy Chain Variable Mutation Prognostic Index Timeto First Treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：