副溶血性弧菌耐热性直接溶血素(TDH)的研究进展

副溶血性弧菌(Vibrio parahaemolyticus)是海产品中一种常见的食源性致病菌,常导致水产养殖动物患病或者引起食物中毒。耐热性直接溶血素(thermotolerant direct hemolysin,TDH)是副溶血性弧菌最为重要的致病因子之一。本文围绕tdh基因在弧菌属中的广泛分布与传播、tdh基因的多样性及其表达调控、TDH的蛋白结构及其生物活性进行了综述,并对未来TDH的研究方向进行了展望。旨在进一步了解由副溶血性弧菌感染所引起的病症,为预防副溶血性弧菌的感染和临床治疗提供理论支撑。

A genome wide association study between copy number variation (CNV) and human height in Chinese population

Copy number variation （CNV） is a type of genetic variation which may have important roles in phenotypic variability and disease susceptibility. To hunt for genetic variants underlying human height variation, we performed a genome wide CNV association study for human height in 618 Chinese unrelated subjects using Affymetrix 500K array set. After adjusting for age and sex, we found that four CNVs at 6p21.3, 8p23.3-23.2, 9p23 and 16p12.1 were associated with human height （with borderline significant p value： 0.013, 0.011, 0.024, 0.049; respectively）. However, after multiple tests correction, none of them was associated with human height. We observed that the gain of copy number （more than 2 copies） at 8p23.3-23.2 was associated with lower height （normal copy number vs. gain of copy number： 161.2 cm vs. 153.7 cm, p = 0.011）, which accounted for 0.9% of height variation. Loss of copy number （less than 2 copies） at 6p21.3 was associated with 0.8% lower height （loss of copy number vs. normal copy number： 154.5 cm vs. 161.1 cm, p = 0.013）. Since no important genes influencing height located in CNVs at loci of 8p23.3-23.2 and 6p21.3, the two CNVs may cause the structural rear- rangements of neighbored important candidate genes, thus regulates the variation of height. Our results expand our knowledge of the genetic factors underlying height variation and the biological regulation of human height.

马来西亚投资环境与税制介绍

近年来,马来西亚凭借其自由的投资政策、极具吸引力的税收优惠政策、先进的基础设施和充满活力的商业环境成为东南亚最具竞争力的投资地之一,备受中国"走出去"企业的青睐。本文简要介绍了马来西亚的商业环境和税制概况,重点介绍了与"走出去"企业密切相关的税种、转让定价制度,以及近年来相关税制和合规性管理的最新发展,并在此基础上对准备赴马来西亚投资的中国企业,提示了需要重点关注的营商环境、税务、外汇等方面风险和问题。