地铁车地无线通信系统 抗干扰方案分析

基于通信列车运行控制（Communication Based Train Control，以下简称CBTC）系统和乘客信息系统（PassengerInformationSystem，以下简称PIS）为城市轨道交通的安全、准点、舒适、高密度和高效率运营提供了有力保障。无论是CBTC系统还是PIS系统，均需要高速运行的地铁列车与地面管理机构之间进行持续交互通信。地铁无线通信作为“车”与“地”之间的唯一通信手段，     

Comparison of STR polymorphism among a Kirgiz ethnic group from Sinkiang and other groups

Objective To study the genetic relationship between Kirgiz individuals living in Sinkiang China and analyze the difference among Kirgiz and the other population with STR polymorphisms. Methods PCR amplification was performed using PE9700, the PCR products were typed by automated sequencer and genescan. Results A database of nine STR loci of Kirgiz was established. It shows there are at least 73 STR alleles and 191 genotypes in Kirgiz. Genotype frequencies distribution showed no deviation from Hardy-Weinberg equilibrium by χ^2 -test. Kirgiz was compared with the other Chinese ethnic groups, then the American Black and the White. Conclusion These results suggested that the nine STR loci and Amelogenin locus were very useful in human identification, biological archaeology and gene resource studies.     

云南怒族线粒体DNA D-环高变区Ⅱ遗传多态性研究

目的 观察中国云南怒族群体线粒体DNA D-环高变区Ⅱ(HVRⅡ)单核苷酸多态性(single nucleotide polymorphism, SNP)的群体遗传特点,为法医学鉴定提供线粒体DNA序列多态性的基础数据.方法 应用ABI3730型遗传分析仪,PCR产物直接测序法,对65名中国云南怒族无关个体血液中利用chelex-100法提取的线粒体DNA D-环高变区Ⅱ进行序列分析.结果 在线粒体DNA高变区Ⅱ(HVRⅡ)73～366之间与Anderson序列比较,云南怒族65名无关个体共发现有59个单倍型,401个突变点.SNP基因差异度为0.995 7,核苷酸多态性为0.117 4.结论 云南怒族线粒体DNA D-环区HVRⅡSNP具有高度多态性,是对怒族群体的个体识别、亲权鉴定以及民族起源分子研究有用的遗传标记.