静水压休克诱导水晶彩鲫三倍体和四倍体的细胞学机理初探

本文分析了静水压休克诱导水晶彩鲫三倍体和四倍体的细胞学机理，促使第二极体保留的压力敏感期较短，在卵子第二次成熟分裂中后期的某段时间，也就是受精后４－５ｍｉｎ时；而在这之前，为卵子启动期，施加压力会破坏卵子的激动和修整过程，造成发育受阻；其后，为压力不应期，此时第二次成熟分裂态势也趋明朗，压力对保留第二极体失去作用。本文还对促使第二极体保留生产鱼类三倍体和抑制第一次卵裂诱导鱼类四倍体的条件等问题进行了讨论

静水压休克诱导水晶彩鲫三倍体和四倍体的细胞学机理初探

本文分析了静水压休克诱导水晶彩鲫三倍体和四倍体的细胞学机理，促使第二极体保留的压力敏感期较短，在卵子第二次成熟分裂中后期的某段时间，也就是受精后４－５ｍｉｎ时；而在这之前，为卵子启动期，施加压力会破坏卵子的激动和修整过程，造成发育受阻；其后，为压力不应期，此时第二次成熟分裂态势也趋明朗，压力对保留第二极体失去作用。本文还对促使第二极体保留生产鱼类三倍体和抑制第一次卵裂诱导鱼类四倍体的条件等问题进

福尔马林固定云南鲴的DNA提取及其细胞色素b基因序列分析

福尔马林固定云南鲴的ＤＮＡ提取及其细胞色素ｂ基因序列分析ＤＮＡＥＸＴＲＡＣＴＥＤＦＲＯＭＦＯＲＭＡＬＩＮ－ＦＩＸＥＤＸｅｎｏｃｙｐｒｉｓｙｕｎｎａｎｅｎｓｉｓＡＮＤＳＥＱＵＥＮＣＥＡＮＡＬＹＳＩＳＯＦＩＴＳＣＹＴＯＣＨＲＯＭＥＢＧＥＮＥ关键词福尔马林..

The Foreign Language Collection Development of Social Sciences & Humanities Since 1949 and Its Future Sustanablity in Academic Libraries

以高校人文社科外文文献为重点,概述建国以来我国高校的文献收藏情况、对人文社会科学研究的支撑程度和满足水平、以及面对问题采取的保障与宏观建设方案。Focusing on the foreign language collections of social sciences and humanities in academic libraries,the paper summarizes its development,support and guarantees level for academic research,and discusses the macro-construction plan in the future.教育部人文社会科学研究规划基金项目“高校人文社科外文文献资源的布局与保障研究”(项目编号:08JA870002)课题的结题论

Studies on Electrochemical Synthesis of 4,5-Disubstituted-1,2- Benzoquinones and the Reaction Mechanism

邻苯二酚在不同亲核试剂存在下经电解氧化 ,一步合成了 4,5_二取代_1,2_苯醌类化合物 ;对电解氧化_迈克尔加成反应进行了探讨 ,提出了可能的反应历程 .The oxidation peak potentials( E p) of alinine derivates and catechol in 0.1 mol/L KCl+15% alcohol solution were measured by cyclic voltammograms technique. The electrochemical oxidation condition was set according to the E p. Three derivates of 4,5_disubstituted _1,2_benzoquinones were prepared via electrochemical oxidation_Michael addition reaction. The possible mechanism of electrochemical oxidation_Michael addition reaction is presented.作者联系地址：中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275,中山大学化学与化学工程学院!广东广州510275Author's Address: Inst.of Chem. and Chem. Engin. of Zhongshan Univ., Guangzhou 510275,China$$

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies