纳滤膜技术在核苷酸浓缩中的应用

介绍了纳滤膜技术用于浓缩核苷酸的系统工艺流程，对纳滤浓缩工艺特点和工业应用情况做了说明。     

谷胱甘肽S转移酶P1基因多态性与慢性阻塞性肺疾病关系的研究

目的:了解湖北地区健康汉族人群和慢性阻塞性肺疾病(COPD)患者谷胱甘肽S转移酶P1(GSTP1)基因多态性,探讨汉族人GSTP1基因多态性与COPD的关系。方法:用聚合酶链式反应—限制性片段长度多态分析(PCR-RFLP)检测68例健康汉族人和50例COPD患者GSTP1基因型。结果:健康人群和COPD人群中有3种基因型,但以Ile105纯合子基因型为主,两组人群的基因型和基因频率比较均无显著性差异(P>0.05)。结论:GSTP1基因多态性可能与COPD的发生无相关性。     

鸡减蛋综合征病毒(EDSV)的基因组特点

在完成鸡减蛋综合征病毒中国株ＡＡ２全基因组核苷酸序列测定的基础上,对其基因组的结构特点进行了分析,结果表明：ＡＡ２株基因组具有腺病毒科成员的某些结构特点,尽管核苷酸及氨基酸序列的同源性较低但是位于Ｅ２区中编码与病毒繁殖和基因具有复制相关的一些酶类或调节蛋白,以及组装病毒颗粒所需的结构蛋白等与其他腺病毒相似。     

BmNPV半胱氨酸蛋白酶基因的核苷酸序列研究

对家蚕核型多角体病毒苏州株（BmNPVsu）半胺氨酸蛋白酶基因（CP）的序列分析表明，该基因读码框为972个核苷酸，编码323个氨。同源性分析表明，BmNPVsu CP的氨基酸序列与不同来源的木瓜蛋白酶超家庭的CP具有较高的同源性，特别与Trpanosomabrucei的CP具有较高的一致性，达32％。在组织蛋白酶B、H、L、S以及木瓜蛋白酶的36个保守氨基酸残基中有31种出现在BmNPUsu的CP中，BmNPVsuCP同其他杆状病毒CP一样，可看作木瓜蛋白酶超家庭成员。     

植物体内的多功能蛋白酶——谷胱甘肽转移酶

谷胱甘肽转移酶(Glutathione S-transferases,GSTs)在植物体内普遍存在,是由一个大的多基因家族编码的多功能蛋白酶。GSTs的表达受多种环境因子的诱导,在植物的生长发育、次生代谢和耐逆中有重要作用。本文简要介绍了GST的研究概况,重点讨论了其生理功能。     

废旧干电池污染液对泥鳅谷胱甘肽硫转移酶活性的影响

将泥鳅暴露于不同浓度的废旧干电池污染液中,于48小时、72小时测定其谷胱甘肽硫转移酶(GSTs)的活性,发现低浓度、短时间内GSTs活性被诱导,随着废旧干电池污染液浓度的增大和暴露时间的延长,GSTs活性被抑制。这些结果表明,GSTs可作为生物标志物来监测水生态系统的污染。     

四逆汤对缺血心肌谷光甘肽S转移酶基因表达的影响

目的：探讨四逆汤对缺血心肌谷光甘肽S转移酶GST基因表达的影响。方法：昆明种小鼠，随机分为对照组、缺血组、缺血加四逆汤组，提取各组心肌组织总RNA通过RT－PCR，以β＝actin为内参照对GST基因的表达水平进行检测。结果：缺血加四逆汤组GST基因表达显强于对照组及缺血组。结论：四逆汤能诱导GST基因的表达，GST能催化谷胱甘肽与亲电子物质发生结合反应。     

Malvastrum yellow vein virus,a new Begomovirus species associated with satellite DNA molecule

Virus isolate Y47 was obtained from Malvastrum coromandelianum showing yellow vein symptom in Honghe, Yunnan Province. The complete nudcotide sequence of DNA-A was determined, it contains 2731 nuclcotides,having typical genomic organiTation of a begomovirns, encoding 6ORFs with 2ORFs [AVI(CP) and AV2] in virionsense DNA and 40RFs (ACl-AC4) in complementary-sense DNA. Comparisons show that the total DNA-A of Y47 has the highest sequence identity (77%) with that of Okra yellow vein mosaic virus-[201] (AJ002451), while less than 76% identities are found when compared with other begomoviruses. The molecular data show that virus isolate Y47 is a distinct begomovirns species, for which the name Maivastrum yellow vein vorus is proposed. Satellite DNA molecule (Y47β) was found to be associated with Y47 using the primers (beta01 and beta02) specific for DNAβ Y47β consists of 1348 nuclcotides, with a functional ORF (CI) in complemen-tary-sense DNA.Y47β has 62%--67% sequence identity with DNAβ molecule associated with Cotton leaf curl Muitan virus or Cotton leaf curl Rajasthan virus, while lower than 46% sequence identities are found when compared with other reported DNA[~ molecules. Relationship dendrograms show that DNAβ molecules are co-evolved with their help begomoviruses.     

Screening microsatellite markers from EST sequences of bay scallop Argopecten irradians

Seventy-five simple sequence repeats （SSRs） were identified by the bioinformatic analysis from 5008 expressed sequence tags （ESTs） of Argopecten irradians. Among the SSRs, the number of repeat nucleotide varied from 2 to 6. Dinucleotide and trinueleotide repeat motifs were dominant in EST-SSRs of bay scallop, with a proportion of 80% over the total screened SSRs. Twenty-nine pairs of primer were designed based on the flank sequences of the selected ESTs using the software of Primet 5, and verified under the given PCR reaction condition. Eighteen of the 29 primer pairs resulted in the expected products, while the remaining either failed to produce any fragments or yielded products over expected size. Thirteen of the 18 SSRs, accounting for 72%, were detected to show polymorphism in the examined scallop samples. A preliminary test in this study indicated that the majority of the identified SSRs were informative in the cultured bay scallops, making them suitable for the population and other genetic analysis. EST-SSR markers have more advantages than the traditional genomic-derived SSRs and there is a wide range of application in comparative mapping, functional gene cloning and marker assisted selection. This research provides a reference to the identification of EST-SSRs with relative bioinformatic analysis from aquaculture species, as well as to those with a large number of ESTs.     

血吸虫抗原肽对某些肿瘤细胞的抑制作用

引言防治肿瘤是当今人类面临的最为迫切的医学难题之一,世界各国有为数众多的医药学家致力于该领域的研究,从已知的或新发现的各种化合物中筛选出具有抗肿瘤活性的物质仍是一种有效的方法。随着多肽化学的发展,具有各种生理活性的多肽分子不断被发现,而多肽分子作为天...