中国主要地方品种猪血液蛋白遗传多样性研究

实验采用水平板淀粉凝胶电泳技术,对中国地方猪五大类型９个品种,１个引入品种共２０１个个体进行了遗传多样性分析。共分析遗传座痊３０个,其中只有ＭＤＨ、ＰＥＰＢ、Ａ从位具有多在记民生。中国主要地方猪品种的多态座位百分比Ｐ＝０．２００,平均杂２合度Ｈ＝０．０６５,平均等位基因数Ａ＝１．３００。根据基因频率采用ＰＨＹＬＩＰ３．５ｃ民计算Ｎｅｉ氏遗传距离,然后用“ＮＥＩＧＨＢＯＲ”程序分别构建Ｎｅｉｇｈｂｏ     

中国猕猴类的蛋白多态性及其遗传分化关系

采用蛋白电泳分析技术研究了来源于我国和越南的猕猴属（Ｇｅｎ ｕｓＭａｃａｃａ）５个种（Ｍ．ｍｕｌａｔｔａ、Ｍ．ａｒｃｔｏｉｄｅｓ、Ｍ．ａｓｓａｍｅｎｓｉｓ、Ｍ．ｔｈｉｂｅｔａｎａ、Ｍ．ｆａｓｃｉｃｕｌａｒｉｓ）的蛋白多态性及其遗传分化关系。共分传座位３０个。在分析的１９只恒河猴中,３０个遗传座有位９个座位表现出多态性,多态座位百分比Ｐ＝０．３,平均等位基因数Ａ＝１．４,平均杂合度Ｈ＝０．０１０４５     

独龙牛遗传多样性及其种群遗传结构的等位酶分析

采用水平片淀粉凝胶电泳技术,进行３０头独牛牛４１种蛋白质共计４４个遗传座位的等位酶分析,只在Ｔｒ,Ｈｐ,Ａｍｙ,Ｅｓｔ等４个座位发现多态性。每个座位等基因的平均数、多态座位百分比和平均杂合度值分别为Ａ＝１．０９０９、Ｐ＝０．０６８２和Ｈ＝０．０２６２。贡山县和福贡县独龙牛群体从酶基因的角度上看遗传多样性贫乏,可能是分别由小种群引种而来,受到瓶颈效应的作用,并伴随着创立者事件的发生。我们结合独龙牛在     

糖基化对乙型肝炎表面抗原疫苗的影响

哺乳动物（ＣＨＯ）细胞表达的三种糖基化程度不同的乙肝表面抗原（ＨＢｓＡｇ）Ａ（含ＧＰ３０,ＧＰ２７,Ｐ２３）,Ｂ（含ＧＰ２７及Ｐ２３）,Ｃ（只有Ｐ２３）,在免疫原性、放置后抗原的稳定性以及对不同单克隆抗体亲和力等方面都有明显的差异;（１）免疫ＢＡＬＢ／Ｃ小鼠后血清中抗体工（ＥＤ５０）。平均结果为Ａ＝１：８０,Ｂ＝１：１１７,Ｃ＝１：１４,表明有糖基的ＨＢｓＡｇ疫苗对小鼠的免疫力明显高于无糖基的ＨＢ     

安徽省宁国县畲族红细胞血型分布

调查１６０名安徽省宁国县畲族村民的ＡＢＯ、Ｒｈ、Ｐ、ＭＮ系统红细胞血型,结果显示ＡＢＯ血型表型频率分布为Ｏ（０．４６８７）〉Ｂ（０．２３７５）〉Ａ（０．２２５０）〉ＡＢ（０．０６８８）,基因频率ｐ＝０．１５００,ｑ＝０．１５７５,ｒ＝０．６９２５;Ｒｈ血型表型频率分布为ＣＣｄｅｅ（０．５３８５）〉ＣＣＤＥ（０．１６６７）〉ＣｃＤＥ（０．１４７４）〉ＣｃＤｅｅ（０．０９６１）〉ｃｃＤＥ（０．０３２１     

6BA诱导的带正电荷的葡萄叶过氧化物酶

河岸葡萄叶的带正电荷过氧化物酶（ｃａｔｉｏｎｉｃ ｐｅｒｏｘｉｄａｓｅ, ＣＰＯＤ） 可受６ＢＡ 诱导,但盐、Ｈ２Ｏ２ 或Ｆｅ２＋＋ Ｈ２Ｏ２ 均使叶片ＣＰＯＤ 活性明显下降,而高浓度的无机盐明显刺激纯ＣＰＯＤ 活性增加。在以愈创木酚为底物时ＣＰＯＤ 最适ｐＨ 为４ ．６０ ～５ ．７５ ,对Ｈ２Ｏ２ 的表观Ｖｍａｘ 和Ｋｍ 值分别为１１０ Ｕ／ｍｇ 蛋白和１ ．１５ｍ ｍｏｌ／Ｌ。     

氧化修饰高密度脂蛋白对培养人动脉平滑肌细胞细胞周期蛋白D_1基因表达的影响

动脉平滑肌细胞（ｓｍ ｏｏｔｈ ｍ ｕｓｃｌｅ ｃｅｌｌ,ＳＭＣ）是动脉粥样硬化（ａｔｈｅｒｏｓｃｌｅｒｏｓｉｓ,ＡＳ）斑块中的主要细胞,它的增殖在ＡＳ形成过程中极其重要．利用体外培养的人主动脉ＳＭＣ,观察了天然高密度脂蛋白（ｎａｔｉｖｅ ｈｉｇｈ ｄｅｎｓｉｔｙ ｌｉｐｏｐｒｏｔｅｉｎ,Ｎ－ＨＤＬ）及氧化修饰ＨＤＬ（ｏｘｉｄｉｚｅｄ ＨＤＬ,ＯＸ－ＨＤＬ）对培养人主动脉ＳＭＣ ｃｙｃｌｉｎ Ｄ１（细胞周期蛋白Ｄ１）基因转录表达的影响．结果表明：（１）Ｎ－ＨＤＬ对ＳＭＣｃｙｃｌｉｎ Ｄ１基因表达无影响（Ｐ＞ ０．０５）;（２）ＯＸ－ＨＤＬ使ＳＭＣｃｙｃｌｉｎ Ｄ１基因表达显著增强（Ｐ＜０．０１）,其表达量随时间（２、１２、２４ ｈ）延长而增加．上述结果表明,ＯＸ－ＨＤＬ的致ＡＳ作用可能与其刺激ＳＭＣｃｙｃｌｉｎ Ｄ１基因表达增加有关．     

血小板生长因子(PDGF-BB)刺激体外培养兔肺动脉平滑肌细胞DNA和蛋白质合成

应用细胞培养、３Ｈ－ＴｄＲ和３Ｈ－Ｌｅｕｃｉｎｅ掺入方法,观察血小板生长因子ＢＢ（Ｐｌａｔｅｌｅｔ－ｄｅｒｉｖｅｄＧｒｏｗｔｈＦａｃｔｏｒＢＢ）对体外培养兔肺动脉平滑肌细胞ＤＮＡ和蛋白质合成的影响。结果表明：（１）当ＰＤＧＦ－ＢＢ浓度为１０ｎｇ／ｍｌ时,３Ｈ－ＴｄＲ掺入值已较对照组显著增高（６２６２．５±４１２．９ｖｓ８３３．５±１２４．０,Ｐ＜０．０５）;当ＰＤＧＦ－ＢＢ浓度为２０ｎｇ／ｍｌ时,３Ｈ－Ｌｅｕｃｉｎｅ掺入值亦较对照线显著增高（１０２１２．８±６３８．３ｖｓ７３４０．３±１１９７．９,Ｐ＜０．０５）。（２）ＰＤＧＦ－ＢＢ浓度在５－２５ｎｇ／ｍｌ范围内,３Ｈ－ＴｄＲ,３Ｈ－Ｌｅｕｃｉｎｅ掺入值与剂量直线相关（ｒＤＮＡ＝０．９７,ｒｐｒｏｔ＝０．９０Ｐ＜０．０５）。说明ＰＤＧＦ－ＢＢ刺激体外培养兔肺动脉平滑肌细胞ＤＮＡ和蛋白质合成。     

HBsAg携带者重叠感染HCV、HDV的血清学调查

对３６２名无症状高滴度ＨＢｓＡｇ携带者用ＲＩＡ法检测ＨＢｅＡｇ、Ａｎｔｉ－ＨＢｅ、Ａｎｔｉ－ＨＣＶ、Ａｎｔｉ－ＨＤＶ。结果表明,ＨＢｅＡｇ阳性率随ＨＢｓＡｇ滴度的增高而增加,且有显著性差异（Ｐ＜０．０５）。重叠感染以ＨＢＶ＋ＨＣＶ最高,占２７．６％;其次是ＨＢＶ＋ＨＤＶ,占９．１％;ＨＢＶ＋ＨＣＶ＋ＨＤＶ最少,占６．４％。但是,以上重叠感染率均与ＨＢｓＡｇ滴度及／或ＨＢｅＡｇ阳性率高低无关（Ｐ＞０．０５）。调查显示,无症状ＨＢｓＡｇ携带者中ＨＢＶ＋ＨＣＶ,或ＨＢＶ＋ＨＤＶ,或ＨＢＶ＋ＨＣＶ＋ＨＤＶ的重叠感染均可发生。     

THINOPYRUM BESSARABICUM和THINOPYRUM ELONGATUM的基 …

对２个八倍体Ｃ．Ｓ－Ｔｈｉｎｏｐｙｒｕｍ ｂｅｓｓａｒａｂｉｃｕｍ（ＡＡＢＢＤＤＪＪ,２ｎ＝８ｘ＝５６）和Ｇｏｓｈａｗｋ（ＧＨＫ）－Ｔｈｉｎｏｐｙｒｕｍ ｅｌｏｎｇａｔｕｍ（ＡＡＢＢＤＤＥＥ,２ｎ＝８ｘ＝５６）的根尖细胞染色体进行Ｃ－分带,从中分检出Ｔｈ．ｂｅｓｓａｒａｂｉｃｕｍ和Ｔｈ．ｅｌｏｎｇａｔｕｍ的各自染色体进行核型分析,结果表明：Ｔｈ．ｂｅｓｓａｒａｂｉｃｕｍ和Ｔｈ．ｅｌｏｎｇａｔｕｍ的     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.