汇率干预的联动效应及对我国汇制改革的启示

文章结合美国和日本1985年以后汇率干预的历史,分析了汇率干预政策形成的经济和政治因素及联动效应,能否实现预期的政策目标。并在对美国和日本汇率干预政策的分析基础上探讨我国的汇制改革问题。国家社会科学基金项目(06CJY002); 中国立信风险管理研究院课题“开放经济条件下外汇储备风险研究”;2005年厦门大学王亚南经济研究院科研资助计划的成果之

甲壳动物精子学研究概况Ⅰ精子的形态与结构

甲壳动物精子学研究概况Ⅰ精子的形态与结构王艺磊1，2）张子平3）李少菁2）（集美大学水产学院养殖系1）厦门361021）（厦门大学海洋学系2）厦门361005）（香港城市大学生物与化学系3）九龙香港）关键词甲壳动物精子形态结构甲壳纲是整个动物界中...福建省自然科学基金;中国科学院昆明动物研究所细胞与分子进化开放实验室资

十足目受精生物学研究概述

由于十足目精子的特殊结构———无鞭毛、不运动、核呈凝絮状、顶体结构复杂，且受精过程迅速，特别是精卵识别、顶体反应，常常在瞬间发生，加上卵子富含卵黄而不易制片，使其受精生物学研究与其它精子具鞭毛的动物相比报道较少。本文就十足目受精生物学的研究做一简要的...福建省自然科学基

甲壳动物精子学研究概况Ⅱ.精子发生与精子的生化组成

甲壳动物精子学研究概况Ⅱ.精子发生与精子的生化组成王艺磊1，2）张子平3）李少菁2）（集美大学水产学院养殖系1）厦门361021）（厦门大学海洋学系2）厦门361005）（香港城市大学生物与化学系3）九龙香港）关键词甲壳动物精子发生生化组成在前文阐...福建省自然科学基金;中国科学院昆明动物研究所细胞与分子进化开放实验室资

Construction of Normalized cDNA Library from Hepatopancreas of Abalone Haliotis diversicolor supertexta Exposure to Tributyltin

用rdP试剂提取三丁基锡暴露诱导的杂色鲍肝胰腺总rnA,经OlIgOTEX纯化得到MrnA;应用SMArT技术合成双链CdnA,双链特异核酸酶(dSn)进行双链CdnA的均一化,构建了杂色鲍三丁基锡暴露诱导下的均一化CdnA文库。原始文库的库容为4.3x106Cfu/Ml,重组率为97.9%。从文库中随机挑选了3288个克隆进行测序,得到3048个高质量EST序列,其中有370条COnTIgS,2103条SInglETS,unIgEnES共2473条,冗余率为18.86%。以上结果说明该文库质量较好,为进一步筛选相关功能基因打下基础;较低的冗余率说明该文库值得继续使用大规模ESTS测序的方法寻找相关功能基因,并为进一步使用基因芯片技术研究相关功能基因的表达谱提供便利。A normalized cDNA library from hepatopancreas of abalone Haliotis diversicolor supertexta exposure to Tributyltin was constructed.Total RNA were prepared using RDP reagent.Oligotex(QIAGEN)was used to separate the mRNA from total RNA.The first strand cDNA was synthesized by transcription of mRNA with the SMART technique.The LD-PCR was performed using a modified SMART primer as the primer set,and the first-strand cDNA as the template to synthesize double strand cDNA.Double strand cDNA was normalized using Duplex-Specific Nuclease(DSN).The containing capacity of the unamplified cDNA library was 4.3×106 CFU/ml with a recombinant rate of 97.9%.A total of 3 288 clones were random selected to be sequenced,and 3 048 high quality ESTs were generated.After processing,a total of 2 473 unigenes comprising 370 contigs and 2 103 singlets were obtained.The redundancy was 18.86%.These results indicate that the normalized cDNA library is suitable to be used for further cloning and analysis of genes related to tributyltin exposure.厦门市科技计划项目(3502Z20055024);国家自然科学基金(20877034);集美大学创新团队基金(2008A001

纳米尺寸合金Ti-Ni,Zr-Ni结构与有机多烯分子的等瓣相似

纳米尺寸 Ti Ni,Zr Ni合金的理论研究表明 ,这些合金以 Ti- Ni,Zr- Ni金属对为基元堆积而成 .(Ti Ni) n,(Zr Ni) n 团簇结构与有机多烯分子等瓣相似 ,无论是链式结构或环式结构 ,都出现明显的强弱键交替的定域键 ,与一般合金团簇中离域键占主导作用相差甚远 ,这可能也是形状记忆功能的原因

一种Ag纳米粒子嵌入的复合材料制备与光催化性能研究

将Zn O纳米线阵列作为模板,采用射频和直流磁控溅射法,结合快速退火工艺制备了Zn O/Ti O2/Ag/Zn Se复合光催化材料。利用扫描电子显微镜、X射线衍射仪、透射电镜、紫外可见吸收光度计、拉曼谱仪等仪器分别考察了复合纳米线的形貌、结构、光学性质和催化性能。研究结果表明,在Zn Se半导体敏化和Ag纳米粒子诱导表面等离激元的共振作用下,复合材料在紫外光和可见光方面表现出了良好的光吸收性能和光催化性能

纳米尺寸团簇Ni_nZr_n(n=3～5)的几何结构与成键规律研究

根据化学键理论与拓朴原理 ,设计了团簇 Nin Zrn(n=3～ 5 )的可能几何构型 ,并用从头算方法进行构型优化 .结果表明 :由 Ni Zr组成的团簇原子间的 Zr—Zr和 Zr— Ni键明显较强 ,而 Ni—Ni的成键较弱 ;并发现 Nin Zrn(n=3～ 5 )团簇电子性质与有机烯烃分子等瓣相似 ,原子之间的成键按照强弱相间的规则分

Acrosome Reaction of Sperm in the Mud Crab Scylla serrata as a Sensitive Toxicity Test for Metal Exposures

【英文摘要】In order to test the sensitivity of the sperm cell of the mud crab Scylla serrata to heavy metals, the toxic effects of Ag+, Cd2+, Cu2+, and Zn2+ on the acrosome reaction (AR) were studied by artificially inducing the AR of sperm exposed to heavy metals, counting the AR rates by light microscopy, and observing structural changes in sperm by transmission electron microscopy. The AR in S. serrata occurs at two stages. The first stage (ARI) is the eversion of the subacrosomal material. The second stage (ARII) is the ejection of the acrosomal filament. The results showed the EC50 values of the AR based on (ARI + ARII)% for Ag+, Cd2+, Cu2+, and Zn2+ were 10.02, 2.14, 13.69, and 2.21 μg/L, and the EC50 values based on ARII % of Ag+, Cd2+, Cu2+, and Zn2+ were 1.96, 0.20, 1.46, and 0.34 μg/L. The order of toxicity is Cd2+ > Zn2+ > Cu2+ > Ag+ based on the percentage of reacted sperm at the second stage. Sperm cells exposed to heavy metals showed an increased rate of swelling, shape irregularities, and the acrosomal filament of some sperm cells was, crooked, ruptured, and even dissolved. The AR of the sperm cell from S. serrata is more sensitive to the tested heavy metals compared to sea urchin sperm cell toxicity tests

Ab initio study of nanocluster NixZry

本文运用量子化学的基本原理，采用GAMESS95、GAMESS2000程序对纯Ni、纯Zr和NixZry非晶态合金结构进行了理论分析及计算研究。通过计算，力图阐明非晶态合金原子团簇NixZry的形成机理，它们的结构特点与成键规律。对于纯的Ni原子团簇，Ni-Ni原子间键距比实验值小，原子簇随原子数的增加，较易于形成单态、三重态的等键长的立体的原子团簇。纯的Zr原子簇易于形成多重度较高的团簇，随原子数的增加，Zr原子团簇的稳定构型由平面的构型变为立体构型。由Ni、Zr形成的二元团簇NixZry，Zr与Ni是前后过渡金属，外层d电子的排列不同，Zr具有比较多的空轨道，Ni具有比较多的孤对电子轨道，...According to the quantum chemistry theory, we study the neutral nanoclusters Nin, Zrn and binary nanocluster NixZry using ab initio (GAMESS version 95, 2000) quantum chemistry method. By calculation, we try to find out the forming principle, geometry structure and bonding rules. We found that the bond length of Ni-Ni in neutral isomers cluster Nin is shorter than experiments in crystal. It seams t...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：19982503