【摘 要】
：
Telomeres are the nucleoprotein structures situated at linear chromosomalends.Their integrity is required for cell proliferation and survival.The vast majority of eukaryotic species use telomerase as
【出 处】
：
中国科学院“百人学者论坛”2009年学术年会
论文部分内容阅读
Telomeres are the nucleoprotein structures situated at linear chromosomalends.Their integrity is required for cell proliferation and survival.The vast majority of eukaryotic species use telomerase as a primary means for telomere maintenance,with only a few exceptions wherein recombination pathway or retrotransposon-mediated transposition pathway is used.
其他文献
Scientists have used both passive and active experimental designs to simulate climate warming.However,for many of the designs the conditions are so unnatural that quantitative extrapolation to field c
CO2的大量排放是地球变暖的主要原因,引起了全球的广泛关注,促成了《气候变动框架条约》(1992年)和《京都议定书》的生效(2005年).其最终目标是将大气温室气体浓度稳定在一个安全的水平上.IPCC预计,本世纪内需要减排几千亿吨到几万亿吨的CO2.我国2006年CO2排放量为52亿吨,居世界第二,并且即将位居第一,承担减排义务只是一个时间的问题.
Malignant tumor is one of the most notorious diseases devastating human lives.Conventional cancer chemotherapeutics utilize natural or synthetic compounds to inhibit cancer cell growth and proliferati
We have shown recently that halogenated quinones could enhance the decomposition of hydroperoxides and formation of alkoxyl/hydroxyl radicals independent of transition metal ions,and a nucleophilic su
随着人类活动引起的大气活性氮、硫等化合物的大量排放,来自大气的氮、硫等环境养分数量也越来越引起人们的重视。本文以大气氮素沉降为例对环境养分的概念、研究方法、数量及其与人为活性氮排放的关系进行了阐述。综合研究发现,大气氮素干湿沉降等环境养分已经成为我国陆地生态系统一项重要的养分资源,其数量高达1800 万吨/年,干湿沉降的数量基本相当。其中,输入农田的环境氮养分可达大气氮沉降总量的1/3,相当于全国
海河流域是我国水系统受人为影响最剧烈的地区之一,特别是七十年代以来,由于人口增长和经济、社会、农业发展驱动,水资源问题愈演愈烈,形成有河皆枯,以及世界上面积最大的地下水漏斗.研究通过量化农业用水,研究农业用水对地表水、地下水系统的影响,表明:人类活动是地表水系统演变的主要因素,农业用水特别是农村实行联产承包责任制初期,是该流域水系统转变的主要时期,地表水流量萎缩的程度与各子流域农业用地的规模直接相
NO是氮生物地球化学循坏的重要产物,在生态系统中主要通过土壤硝化-反硝化过程产生并排放.然而,在人苏达盐渍土NO的排放与吸收过程却研究极少.利用实验室控制实验研究松嫩平原西部4 种不同土地利用方式下苏达盐渍土NO生物排放,结果表明:自然草原、人工草原、盐渍土水稻田、伴沙盐渍土水稻田NO产生与排放的最佳含水量分别为14.0％,9.0%,9.5%,and18% WFPS,在同一土壤湿地前提下,NO通量
Using the data from the Proportional Counter Array and the High-Energy X-ray Timing Experiment on board the Rossi X-Ray Timing Explorer satellite,we investigate the evolution of the 3-220~keV spectra
Soil organic matter accumulation in farmland is not only vital for the maintenance of soil productivity,but also for the mitigation of global warming.Rice-wheat rotation agroecosystem is one of the pr
Although several genes have been shown to be essential for the dorsal pancreas specification,little is known about the ventral pancreas specification.Liver and ventral pancreas are derived from a comm