H9N2亚型禽流感病毒聚合酶基因的克隆及序列分析

采用RT-PCR方法对1株H9N2亚型禽流感病毒Ck/GS/2/99株RNA聚合酶基因PB2、PB1和PA分别进行了扩增,将其克隆到pGEM-T easy载体后进行序列测定与分析。结果表明,该株病毒的PB2、PB1和PA基因开放阅读框(ORF)分别由2280、2274和2 151个碱基组成,分别编码759、757和716个氨基酸。经同源性与系统发生树分析,该毒株RNA聚合酶基因PB2、PB1和PA与Ck/NX/4/99株的核苷酸和氨基酸同源性均在98%以上,另外这3个基因与Dk/HK/Y280/97、Sw/HK/9/98和Qu/HK/NT/28/99株的关系密切。     

扩增X—Y同源Amelogenin基因内含子在性别鉴定中的应用研究

本文用一对针对X－Y同源的Amelogenin基因第一内含子的引物，于同一试管中分别扩增出针对于x和Y染色体的特异性DNA片段：106bp及112bp的PCR产物，经聚丙烯酰胺凝胶电泳后用银染法观察扩增结果，取得了满意的效果．对50pgDNA模板室温放置16年的血痕及单根毛发、烟头等检材均可得到明确的性别鉴定结果．本实验证明该方法简便、灵敏、可靠、特别适用于腐败降解检材的法医学性别鉴定．     

Genetic polymorphism at 15 tetrameric short tandem repeat loci in four aboriginal tribal populations of Bengal

POPULATIONS: This study reports the genetic polymorphism observed at 15 short tandem repeat loci D3S1358, TH01, D21S11, D18S51, D5S818, D13S317, D7S820, D16S539, CSF1PO, vWA, D8S1179, TPOX, D2S1338, D19S433, and FGA in four aboriginal populations of Bengal. The analysis was performed to decipher the suitability of CODIS as well as six other highly polymorphic and unlinked markers in Forensic Testing. Studied populations include four tribes: Karmali, Kora, Maheli, and Lodha.     

“9＋2”与“10＋1”框架机制比较

中国—东盟的全面经济合作,是应经济全球化而产生的国际区域合作的又一新的成果,其“合作框架协议”是最基本的法制依据。而我国南方九省区加上香港、澳门两地的“泛珠三角区域合作”则是在一个国家之内,“一国两制”之下不同省区横向合作的机制创新,它不仅受到了国际区域经济合作创新的启示,而且顺应了整个社会区域整体发展的潮流。本文将在二者的实施框架机制方面进行一定的比较,欲为“泛珠三角区域合作”的法制建构献可替否。     

H2O2诱导PC12细胞凋亡前后miRNA的变化及探讨

目的用微小RNA(miRNA)基因芯片技术检测H2O2诱导凋亡的PC12细胞和正常PC12细胞miR-NA的表达谱差异。方法分别以不同浓度的H2O2处理PC12细胞12h,用MTT和流式细胞仪检测处理后细胞的生长活力和凋亡情况;分别提取A(0浓度H2O2处理组)和B(400nmol/LH2O2处理组)PC12细胞的miRNA做miRNA基因芯片检测。结果以A组作为对照,30、50、100、200、400nmol/L的H2O2处理的PC12细胞生存率分别为(92±9.80)%、(90±14.70)%、(80±13.85)%、(54±12.33)%、(22±7.35)%(P<0.01);0、30、50、100、200和400nmol/L的H2O2处理的PC12细胞早期凋亡率分别为2.6%、5.2%、7.2%、10.4%、16.6%、72.2%;在样品A中共筛选出68个有效表达的miRNA分子数据,在样品B中筛选出46个有效表达的miRNA分子数据,两者样品中均检测到有效表达的miRNA分子有39个,其中与样品A相比,在样品B中显著性下调表达的有6个。结论为脑缺血再灌注损伤中神经细胞凋亡的机制和治疗的研究提供了理论依据和新的研究思路。     

二醋吗啡对大鼠心肌细胞游离Ca^2＋浓度的作用

目的观察二醋吗啡对心肌细胞内游离Ca2 浓度的作用。方法取自1～3d的SD大鼠培养的心肌细胞,用荧光探针Fluo-3/AM负载心肌细胞,不同浓度及不同剂量的二醋吗啡作用心肌细胞,激光共聚焦显微镜下检测Ca2 的变化。结果不同剂量及浓度的二醋吗啡对心肌细胞内游离Ca2 浓度有不同作用,一定浓度的二醋吗啡使心肌细胞内游离Ca2 浓度呈剂量依赖性的升高、短时间内心肌细胞[Ca2 ]i荧光强度增强,并产生[Ca2 ]i峰。结论探索出二醋吗啡导致心肌细胞内Ca2 变化的有效浓度,为进一步深入研究打下了基础。     

Nixon and the Jews

ABSTRACT

In public the 37th President of the United States did not express hostility or disparagement, or show any signs of religious prejudice towards Jews. But inside the White House, Richard M. Nixon's remarks were often scurrilous. His antisemitism was not casual; it was close to compulsive. And it could be coupled with other seething grievances, for example, towards liberals, radicals, the media, Blacks and Italian-Americans. Yet Nixon controlled his antisemitism. It had no adverse effect on Jewish life, either at home or abroad. The malice that he nurtured remained unmobilized. Apart from a few limited personnel instances (mostly but not completely ignored by Nixon's underlings), it is impossible to connect private resentment to public policy, probably because the barriers to the expression of antisemitism in the United States have been so high. The ugliness of his utterances in the Oval Office revealed his character, but did not extend outward to shape the processes of governance. A disconnect can therefore be discerned between what he felt and how he acted. Most American Jews voted for Nixon's Democratic opponents in 1968 and 1972. But even Jews who voted against him, even those who loathed him, have often acknowledged that Nixon's policies fortified the security of Israel; and he was proud of his support for the Jewish state during the Yom Kippur War. What betrayed Nixon, and what forced him to resign the presidency, was his decision to instal a secret taping system in the Oval Office. When the tapes were played in 1974, he showed himself to be conspiring to obstruct justice. In subsequent years, further exposure of the tapes revealed the extent and intensity of Nixon's antipathy to Jews. The expletives that had to be deleted did much to besmirch the dignity of the office. But such was the stigma the political culture attached to antisemitism that, had his bigotry become public before 1968, Nixon's career would have been over.     

Comparison of two methods for isolating DNA from human skeletal remains for STR analysis

Abstract: The quality and efficiency of a standard organic DNA isolation method and a silica‐based method using the QIAGEN Blood Maxi Kit were compared to obtain human DNA and short tandem repeats (STRs) profiles from 39 exhumed bone samples for paternity testing. DNA samples were quantified by real‐time PCR, and STR profiles were obtained using the AmpFlSTR^® Identifiler^® PCR amplification kit. Overall, the silica‐based method recovered less DNA ranging from 0 to 147.7 ng/g (average 7.57 ng/g, median = 1.3 ng/g) than did the organic method ranging from 0 to 605 ng/g (average 44.27 ng/g, median = 5.8 ng/g). Complete profiles (16/16 loci tested) were obtained from 37/39 samples (95%) using the organic method and from 9/39 samples (23%) with the silica‐based method. Compared with a standard organic DNA isolation method, our results indicate that the published silica‐based method does not improve neither the quality nor the quantity of DNA for STR profiling.