塔叶苔属（Schiffneria Steph.）（Hepaticae）的研究

塔叶苔属（Schiffneria Steph.）建立于1894年。作者在研究中国标本时,发现一新种——Schiffneria yunnanensis C. Gao &; W. Li sp. nov.。塔叶苔属的配子体为叶状体,生殖枝具茎叶返祖现象,应置于叶苔亚纲的叶状体无组织分化类群——带叶苔目（Pallaviciniales）之中。     

秦岭地区苔类植物区系的初步研究

在野外调查和已有资料的基础上,分析了秦岭地区苔类植物区系组成和分布类型.现知秦岭地区苔类、角苔类有35科66属270种.其中指叶苔科、叶苔科、裂叶苔科、合叶苔科、齿萼苔科、羽苔科、光萼苔科、耳叶苔科、细鳞苔科、瘤冠苔科为优势科;指叶苔属、鞭苔属、叶苔属、裂叶苔属、合叶苔属、羽苔属、扁萼苔属、光萼苔属、耳叶苔属、细鳞苔属为优势属.在区系成分上,温带成分最高,东亚、热带亚洲成分次之,中国特有成分也比较高.同时有大量的科中仅一属和属中仅一种的类群存在,说明本地区苔类植物科属结构比较简单,分化程度不高.还分析了秦岭苔类植物区系及我国其他5个地区苔类植物区系之间的关系.     

异叶苣苔属地上茎的生长式样及其系统发育意义

对异叶苣苔属植物地上茎形态发生过程的观察旨在揭示该属地上茎的生长式样。该研究发现异 叶苣苔属植物地上茎的生长式样并不是以往所认为的简单顶端生长。该属植物的顶芽已完全受到抑制。其地上茎实际上是萌发于小型叶叶腋的侧芽替代顶芽生长所形成的各级侧枝系统,即合轴分枝系统。异叶苣苔属植物地上茎的不分枝情况是位于大型叶叶腋的腋芽受到抑制所致,纯粹是一种次生现象,并不是尖舌苣苔族植物原始祖先的孑遗性状。尖舌苣苔族其他属植物地上茎的生长式样并不均是从异叶苣苔属植物的生长式样演化而来。出蕊苣苔属和异叶苣苔属植物地上茎的生长式样可能来自同一个不太远的祖先,但已经向着不同的方向演化。独叶苣苔属植物复杂的圆锥状对花聚伞花序并非从异叶苣苔属地上茎上部,即生殖生长部分退化而来,乃幼态成熟的复化过程所致。尖舌苣苔属的总状花序可能更接近尖舌苣苔族的原始祖先类型。     

河北省苔类植物新纪录属的研究—I.耳叶苔属（Frullania Raddi）

在研究标本和文献的基础上,对河北省苔类植物新纪录属-耳叶苔属Frullania Raddi进行了首次报道,其中包括达乌里耳叶苔F.davurica、达乌里耳叶苔凹叶变种F.davuricavar.concava、石生耳叶苔F.inflata、盔瓣耳叶苔F.muscicola、陕西耳叶苔F.schensiana、塔拉大克耳叶苔F.taradakensis、远东耳叶苔F.fauriana和筒瓣耳叶苔F.diversitexta等7种1变种。本文对它们的生境和地理分布作了初步讨论,并编制了河北省耳叶苔属植物的分种检索表。     

河北省苔类植物新纪录属的研究——Ⅰ.耳叶苔属(Frullania Raddi)

在研究标本和文献的基础上,对河北省苔类植物新纪录属--耳叶苔属Frullania Raddi进行了首次报道,其中包括达乌里耳叶苔F. davurica、达乌里耳叶苔凹叶变种F. davurica var. concava、石生耳叶苔F. inflata、盔瓣耳叶苔F. muscicola、陕西耳叶苔F. schensiana、塔拉大克耳叶苔F. taradakensis、远东耳叶苔F. fauriana和筒瓣耳叶苔F. diversitexta等7种1变种。本文对它们的生境和地理分布作了初步讨论,并编制了河北省耳叶苔属植物的分种检索表。     

黄山苔类植物区系研究

黄山位于安徽省南部,根据调查和统计,共有苔类植物28科、48属、117种（包括亚种和变种）。该区苔类植物的优势科为细鳞苔科Lejeuneaceae、羽苔科Plagiochilaceae、光萼苔科Porellaceae、耳叶苔科Frullaniaceae;优势属为耳叶苔属Frullania、羽苔属Plagiochila、光萼苔属Porella、鞭苔属Bazzania、细鳞苔属Lejeunea。区系成分以热带成分和东亚成分为主,分别占到40％和39．09％,北温带成分占有一定的比例为20％。无毛拳叶苔Nowellia aciliata（P．C．Chen＆P．C．Wu）Mizut．和新绒苔Neotrichocolea bissetii（Mitt．）S．Hatt被列入我国濒危苔藓植物红色名录。     

九龙大雾山的叶附生苔类植物

九龙大雾山已知叶附生苔类植物有5科10属12种,其中有5属6种,即双齿护蒴苔、小叶拟大萼苔、东亚指叶苔、四齿异萼苔、双齿异萼苔和台湾角鳞苔,均为我国叶附生苔类的新记录。     

异叶苣苔属(苦苣苔科)的核型研究

本文首次报道了中国特有异叶苣苔属的染色体数目及核型。该属所研究种类的染色体数目均为 2n＝18,染色体长度在2.0µm以上,在尖舌苣苔族所报道的染色体中显示出较原始的性状。尖舌苣苔 族的染色体基数可能是x=9。异叶苣苔属的间期核均为复杂型;前期染色体呈渐变型。核型从对称型 向不对称型的演化主要表现在近中部着丝粒,尤其是近端部着丝粒染色体比例的增大。毕节异叶苣苔 W．bljieensis和峨眉异叶苣苔W．tsiangiana var．wilsonii的核型分别为2n=2m＋8m＋8sm(1sat)和 2n=2m＋8m(1sat)＋8sm(2sat),较为对称。紫红异叶苣苔W．purpurascens和白花异叶苣苔W. tsiangiana var. tsiangiana的核型分别为2n=4m＋6sm＋8st(1sat)和2n=4m＋8sm(2sat)＋6st,比较 特化。河口异叶苣苔W．hekouensis的核型是2n=4m+10sm(1sat)+4st,处于二者之间。峨眉异叶苣 苔和原变种白花异叶苣苔的核型差异较大,在外部形态方面二者之间的性状变异也间断较大。本文建 议将该变种从白花异叶苣苔W．tsiangiana中移出自成一种,并和毕节异叶苣苔近缘。     

中国挺叶苔属(Anastrophyllum (Hepaticae))一新记录种

本文报道了挺叶苔属（Anastrophyllum)的一中国新记录种毛口挺叶苔（Anastrophyllum piligerum(Nees)Steph.),并对该属的分类情况进行了讨论。     

中国疣叶苔属一新记录种

疣叶苔属Ｈｏｒｉｋａｗａｅｌｌａ是隶属于苔类植物叶苔科Ｊｕｎｇｅｒｍａｎｎｉａｃｅａｅ中的一个属。该属首先由Ｈａｔｔｏｒｉ和Ａｍａｋａｗａ (1971)以疣叶苔 (Ｈｏｒｉｋａｗａｅｌｌａｓｕｂａｃｕｔａ (Ｈｅｒｚ.)Ｈａｔｔ.ｅｔＡｍａｋ .) (=ＡｎａｓｔｒｏｐｈｙｌｌｕｍｓｕｂａｃｕｔｕｍＨｅｒｚ.)为模式于 1971年创立。Ａｍａｋａｗａ和Ｈａｔｔｏｒｉ在研究尼泊尔的标本时发现了本属的另一种Ｈ ｇｒｏｓｓｅ ｖｅｒｒｕｏｓａＡｍａｋ .ｅｔＨａｔｔ.。衣艳君等 (1998)在研究中国云南地区标本时又发现报道了本属另一新种…     

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.