蛋白质OC-17说话:先有鸡

关于"先有鸡还是先有蛋"的争论,在哲学和科学等诸多领域已经持续了千百年,然而始终没有一个明确的答案。日前,英国谢菲尔德大学和沃里克大学的科学家经     

如何让宝宝遗传父母的优点

科学家的研究表明,如果从父母一方获得的遗传物质DNA可以确定子女的身体特征,那它也会影响他们性格的某些方面。因此,像激动、胆怯或者外向这些性格表现都是从母亲或父亲的基因中遗传下来的。通常情况下,我们认定某个人"像他父亲一样脾气暴躁"或者"像他母亲一样多愁善感",是说明了我们性格中的多大特征来自遗传一般来说在每     

艾滋病的罪魁祸首——HIV病毒

艾滋,是获得性免疫缺陷综合征的英文缩写AIDS（Acquired Immune Deficiency Syndrome）的音译。引起艾滋病等相关疾病的病毒被称为＂人类免疫缺陷病毒＂,即HIV。它是一种以RNA（核糖核酸）为遗传物质的慢病毒,     

高等植物的性别表达及其调控——外界因子对植物性别表达的影响

高等植物的性别表达研究是成花生理及发育生理的一个特殊组成部分,是生殖生理学中的最重要问题之一,在理论上、实践上都具有重要意义.由于植物性别表达本身的特点,使高等植物成为研究发育、性别表达及其决定的优良实验系统.     

Generating of rice OsCENH3-GFP transgenic plants and their genetic applications

In order to investigate rice functional centromeres, OsCENH3-GFP chimeric gene was constructed and transformed into the indica rice variety, Zhongxian 3037, mediated by Agrobacturium. The integration of the exogenous genes in the transgenic plants was confirmed by PCR and Southern blotting. The transgenic plants grow normally during their whole life time, just like Zhongxian 3037. No significant defects were detected in either mitosis or meiosis of the transgenic plants. The overlapping of GFP signals and anti-CENH3 foci in both mitotic and meiotic cells from T0 and T1 generation plants indicated that GFP had been successfully fused with CENH3, so the GFP signals can well represent the CENH3 locations on each chromosome. To evaluate the applicability of the transgenic plants to other genetic studies, fluorescence in situ hybridization （FISH） using rice centromeric tandem repetitive sequence CentO as the probe was conducted on the zygotene chromosomes of pollen mother cells （PMCs）. It has been revealed that the GFP signals are overlapping with CentO FISH signals, showing that CentO is one of the key elements constituting rice functional centromeres. Immunofluorescent staining using anti-o-tublin antibody and anti-PAIR2 antibody on the chromosomes during mitosis and meiosis stages of the transgenic plants further reveals that OsCENH3-GFP transgenic plants can be widely used for studying rice molecular biology, especially for tagging functional centromeres in both living cells and tissues.     

Overview of HBV whole genome data in public repositories and the Chinese HBV reference sequences

The number of Hepatitis B virus （HBV） whole genomic sequences in public nucleotide databases （GenBank, EMBL, and DDBJ） had reached 866 by January 1, 2007. Coming from 46 countries and regions, these sequences were categorized as eight genotypes （A-H）. With the statistical and phylogenetic analysis on all available complete genomic data of HBV, we here present an overview of HBV sequences in public databases. From all registered 229 HBV genomes in Chinese regions as well as 59 sequencing data from our research group, we report the establishment of reference sequences of HBV strains prevailing in China. These analyses provide clues for the effects of HBV genotypes in host clinical progressions, geographic distribution of the infection, and the viral evolutionary history. Moreover, the viral sequence reference would be helpful in the identification of various HBV mutations. Based on the analysis of various public databases, we suggest that the Chinese HBV database with the clinical information should be constructed.     

论基因组的分子进化

本文主要探讨了在生物进化中的ＲＮＡ和ＤＮＡ分子改变的方式和方法，从基本的本质上说明了ＤＮＡ分子在生物进化中的作用。     

保护基因组的稳定性可以改善iPS细胞质量

正[本刊讯]中国科学院上海生命科学研究院生物化学与细胞生物学研究所李劲松研究组与南开大学刘林研究组发现,将核移植过程中的重要因子Zscan4与山中伸弥(Yamanaka)因子共同使用,不仅能够显著提高iPS细胞的产生效率,而且降低其形成过程中DNA的损伤,显著地改善了iPS细胞的     

浅谈优质小麦品质的影响因素

1．自身因素。选择一个好的小麦品种是非常重要的。因为优质的小麦品种是获得优质小麦的内因和基础，也就是说遗传物质是小麦品质的决定因素。目前．适宜我省种植的优质小麦品种有豫麦34、豫麦47、郑麦9023、郑麦98等。     

论无丝分裂

论述了无丝分裂的方式,发生无丝分裂的生物体组织,无丝分裂过程中遗传物质的变化,无丝分裂在细胞增殖中的作用及生物学意义.