砂螺属一新种(肺螺亚纲:柄眼目:虹蛹螺科)

作者分别于１９９３年８月８日和１９９４年５月２３日,在云南省获得一批陆生贝类标本;经鉴定发现砂螺属一新种,即石林砂螺Ｇａｓｔｒｏｃｏｐｔａ ｓｈｉｌｉｎｅｎｓｉｓ ｓｐ．ｎｏｖ．,隶属于肺螺亚纲：柄眼目：虹蛹螺科：砂螺属。本文对新种的形态特征、栖息环境进行了记述,并对其近似种进行了讨论。     

陕西省陆生贝类二新种（肺螺亚纲：柄眼目：虹蛹螺科）

１９９２年３月至５月,作者在陕西省获得陆生贝类标本一批,经鉴定发现二新种,即石泉砂螺Ｇａｓｔｒｏｃｏｐｔａ ｓｈｉｑｕａｎｅｎｓｉｓ ｓｐ．ｎｏｖ．和留坝砂螺Ｇａｓｔｒｏｃｏｐｔａ ｌｉｕｂａｎｅｎｓｉｓ ｓｐ．ｎｏｖ．,隶属于肺螺亚纲、柄眼目、虹蛹螺科、砂螺属。本文对二新种形态特征、栖息环境进行了描述,并对其近似种进行了讨论。     

中国虹蛹螺科二新种(肺螺亚纲:柄眼目:虹蛹螺科)

作者 作者晨贵州省镇宁布依赖苏州自治县境内采得陆生贝类标本一批,经鉴定得喇叭螺属２种,即：天星桥喇叭螺,新种Ｂｏｙｓｉｄｉａ （Ｂａｎｓｏｎｅｌｌａ）ｔｉａｎｘｉｎｇｑｉａｏｅｎｓｉｓ,Ｌｕｏ,Ｃｈｅｎ ｅｔ Ｚｈａｎｇ ｓｐ．ｎｏｖ 果喇叭螺,新种Ｂｏｙｓｉｄｉａ（Ｂｏｙｓｉｄｉａ）ｈｕａｎｇｇｕｏｓｈｕｅｎｓｉｓ Ｌｕｏ,Ｃｈｅｎ ｅｔ Ｚｈａｎｇｅ,ｓｐ．ｎｏｖ。对新种的形态进行了详细描述     

中国裂唇螺属一新种记述(前鳃亚纲,中腹足目,蛹螺科)

笔者在整理福建龙岩地区陆生贝类标本时,经比对鉴定发现1新种,龙岩裂唇螺Schistoloma longyanensis sp.nov..隶属前鳃亚纲、中腹足目、蛹螺科、裂唇螺属.对新种形态特征、栖息环境作了记述,并与近似种进行了比较讨论.     

中国陆生贝类二新种（肺螺亚纲：柄眼目：虹蛹螺科）

１９９２年３月至５月,作用在陕西省考察,获得陆生贝类一批,经鉴定发现２新种,即双片喇叭螺Ｂｏｙｓｉｄｉａ ｄｉｌａｍｅｌｌａｒｉｓ ｓｐ．ｎｏｖ．和凤县喇叭螺Ｂｏｙｓｉｄｉａ ｆｅｎｇｘｉａｎｅｎｓｉｓ ｓｐ．ｎｏｖ．,隶于肺螺亚纲、柄眼目、虹蛹螺科、喇叭螺属。文内对２新种形态特征、栖息环境进行地描述,并对其相似种进行了讨论。     

中国云南喇叭螺属一新种(肺螺亚纲,柄眼目,虹蛹螺科)

详细记述了喇叭螺属Boysidia一新种,金平喇叭螺新种Boysidia(Bensonella)jinpingensis sp.nov.。对新种的形态进行了详细描述,并与其近似种进行了对比和讨论。模式标本保存于昆明医科大学细胞生物学与医学遗传学系标本室。     

广西砂螺属一新种(肺螺亚纲:柄眼目:虹蛹螺科)

作者于1999年在广西十万大山地区进行动物资源调查,获得一批陆生贝类,经鉴定得1新种,即扶隆砂螺Gastrocopta fulongensis sp.nov.。对新种进行详细的描述,并与近似种作了比较。     

喇叭螺属一新种(肺螺亚纲,柄眼目,虹蛹螺科)

在贵州省喀斯特地貌区陆生贝类多样性调查采得的标本中,经鉴定得喇叭螺属1新种,即兴义贝喇叭螺Boysidia(Bansonella)xingyiensis sp.nov..对新种的形态进行了详细描述,与其近似种进行了对比.正、副模标本均保存于中国科学院动物研究所标本馆.     

中国喇叭螺属的研究及六新种记述(肺螺亚纲:柄眼目:虹蛹螺科)

作者整理和记忆了中国科学院动物研究所历年来所保存的中国喇叭螺属的标本,共计有１４种,其中有６新种,即五齿喇叭螺,凤悬喇叭螺,,西山喇叭螺,太白喇叭螺,双片贝喇叭螺,石林贝喇叭螺,文中对中国喇叭螺属的种类进行了整理和鉴别,并对６新种的形态特态,栖息环境进行了记述,对相似种进行了讨论。     

中国喇叭螺属一新种记述(肺螺亚纲,柄眼目,虹蛹螺科)

记述了采自贵州的陆生贝类1新种,南江贝喇叭螺Boysidia(Bensonella)nanjiangensis sp.nov.,新种与潼关贝喇叭螺Boysidia(Bensonella)tongguanensis Chen&Zhang,2002近似,文中附新种特征图。模式标本均保存于中国科学院动物研究所。     

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.     

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.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.