Epitypification： should we epitypify？

Epitypification can solve many taxonomic problems and stabilize the understanding of species, genera, families or orders. The aim of this paper is to illustrate how to epitypify. A few examples where taxa have been epitypified are considered and the benefits and disadvantages of epitypification are discussed. We also outline some examples of taxa which need to be epitypifled with reasons.     

国外科技期刊亮点

人类首次获得太阳系边缘信息2007年8月30日,经过30年的长途跋涉,"旅行者2号"飞船在离地球85AU处对终止激波进行了就地直接观测,这是人类史上首次传回太阳系边缘信息。美国麻省理工学院Kavli天体物理与空间研究所J.D.Richardson、     

基因表达的幕后

基因外遗传的研究者们正在揭示蛋白质与RNA改变基因活性的多种方式——     

The Sino-U.K. Seminar on Genome Analysis and Bio-molecular Sciences Held in Beijing

Co-sponsored by NSFC and the British Council, the Sino-UK Seminar on Genome Analysis and Bio-molecular Sciences was held in Beijing from Mar. 14 to 15. Prof. Zhu Zuoyan, Vice President of NSFC, attended the seminar and extended his warm congratulations on behalfofNSFC. In his speech, he also expressed his hope that young scientists from both China and the UK should build up friendship and cooperation through dialogue and mutual understanding so as to work for a brighter future.     

视黄酸受体γ基因的研究进展

对视黄酸受体家族、视黄酸受体γ基因和视黄酸受体γ同工型基因的结构以及视黄酸受体γ的表达与调控等方面进行了综述．     

核受体LXRa靶基因研究进展

核受体的研究近几年已有飞速的发展。LXRa(Liver X Receptor a)是一种与脂类代谢有关的核受体。研究发现LXRa的靶基因具有调节脂类的吸收、运输、转化和生物合成的功能,此外,LXRa在糖类的代谢等方面也有重要的调控作用。研究结果表明LXRa与动脉粥样硬化的发生有非常密切的关系。目前利用LXRa为靶标进行抗动脉粥样硬化药物筛选已经成为一个重要的研究方法。     

CML细胞抗原相关TCR Vα13／Vβ21和Vα18／Vβ21寡克隆T细胞及其CDR3序列特点

目的:分析慢性粒细胞白血病(CML)病人的克隆性增殖T细胞及其CDR3序列的特点。方法:利用RT-PCR和基因扫描分析1例CML患者外周血单个核细胞中的TCR Vα和Vβ基因的互补决定区(CDR3),了解各Vα和Vβ亚家族的限制性表达情况和T细胞克隆性增殖特点,寡克隆的PCR产物再进行序列分析。结果:该病人外周血T细胞表达18个TCR Vα和12个TCR Vβ亚家族,其中Vα13、Vα18、Vβ1和Vβ21亚家族呈寡克隆性。CDR3序列分析获得3个TCR克隆基因序列,分别为Vα13NJα49、Vα18NJα50和Vβ21NDβNJβ2.7。结论:获得1例CML病人外周血克隆性增殖αβ T细胞的3个TCR基因CDR3序列,提示病人可能存在与CML细胞抗原相关的Vα13/Vβ21或Vα18/Vβ21T细胞克隆。