中国藓类一新纪录种―嵌边拟平藓

报道了原产于东南亚的嵌边拟平藓[Neckeropsis moutieri（Broth．＆ Par．in Par．）Fleisch．]为中国新纪录种。本种与云南拟平藓（Neckeropsis takahashii Higuchi et al．）最为相似,但因具丝状的假鳞毛和较弱的分化嵌边而有别。同时,还提供了嵌边拟平藓详细的描述和形态图,以及中国产拟平藓属11种的分种检索表。     

香港苔藓植物新纪录—绒苔科和拟平藓属

研究了部分中国科学院华南植物研究所和香港嘉道理农场暨无于１９９５年两次联合采 标本,本文报道了绒苔科和拟平藓属为香港苔藓植物新记录,分别基于绒苔和钝叶拟平藓。     

中国蔓藓科新种和新分布种

作者近来较系统地研究了蔓藓科植物,发现了2个新种和5个新分布种,即毛叶蔓藓Meteorium ciliaphyllum Lou,sp.nov.;疣突蔓藓Meteorium elatipapillaLou sp.nov.;异叶灰气藓Aerobryopsis cochlearifolia Dix.Ann.Bryol.;细枝灰气藓Aerobryopsis membranacea(Mitt.)Broth.;大灰气藓长尖亚种Acrobr-yopsis subdivergens(Broth.);波边悬藓Barbella convolvens(Mitt.)Broth.;刺叶悬藓Barbella spiculata(Mitt.)Broth.。     

中国东北六种藓类植物的细胞学观察

本文对我国东北产6种藓类的孢子母细胞减数分裂中期I的染色体数进行了报道。结果如下： 羽枝青藓Brachythecium plumosum （Hedw．)B．S．G．,n=15;钝叶绢藓Entodon obtusatus(Mitt) Jaeg．,n=11;东亚绢藓E．okamurae Mitt,n=11;丛本藓Anoctangium aestivum(Hedw．)Mitt．, n＝13;真藓Bryum argenteum Hedw．,n=10;尖叶美喙藓Eurhynchium eustegium(Besch．)Dix.,n=20+2m,其中前三种为首次报道。     

中国东北产6种藓类植物的染色体观察

苔藓植物细胞学研究始于 2 0世纪 [1 ] 。我国有关这方面的研究自 1 988年开始 ,据 1 998年周云龙统计 ,国内学者共报道了 94种苔藓植物的染色体数目 ,其中苔类有 1 6科、1 9属、2 3种 ,5种为首次报道 ;藓类有 2 1科、37属、71种 ,2 7种为首次报道[2 ] 。这些研究为苔藓植物的系统学、生态学、遗传学等提供了直接或间接的资料和证据。1 　材料和方法将采集的苔藓植物培养在室内北窗台上。取生长旺盛的茎尖用对二氯苯饱和水溶液预处理 5～ 7h,卡诺固定液 (纯酒精∶冰醋酸 =3∶ 1 )固定 ,95%酒精∶盐酸 ( 1∶ 1 )离析1 0～ 2 0 min后剥离茎尖…     

中国青藓科研究资料(III)

研究了青藓科的7种1变种（Brachythecium planiusculum,Eurhynchium coarctum,E.serricuspis,Rhynchostegium leptomitophyllum,R.longirameum,R.pallenticaule,R.subspeciosum和R.subspeciosum var.filiforme）的模式标本。提出了3个新组合（E urhynchium longirameum,E.filiforme,Bryhnia serricuspis）,     

云南苔藓植物新记录--虾藓科

报道了中美联合云南高黎贡山考察过程中发现的一个云南苔藓植物新记录科——虾藓科。云南贡山县普拉河为该科下类群日本虾藓(Bryoxiphiumnorvegicumsubsp.japonicum.)于中国西南横断山-高黎贡山自然分布区的最南沿。     

香港苔藓植物新纪录——绒苔科和拟平藓

研究了部分中国科学院华南植物研究所和香港嘉道理农场暨植物园于１９９５年两次联合采集的标本,本文报道了绒苔科和拟平藓属为香港苔藓植物新纪录,分别基于绒苔（广义）和钝叶拟平藓。     

中国青藓科研究资料(Ⅲ)

研究了青藓科的7种1变种（Brachythecium planiusculum,Eurhynchium coanctum,E.serricuspis,Rhynchostegium leptomitophyllum,R.longirameum,R.pallenticaule,R.subspeciasum和R.subspeciosum var.filiforme)的模式标本。提出了3个新组合（Eurhynchium longirameum,E,filifome,Bryhnia serricuspis),将R.leptomitophyllum作为E.savatieri Schimp.ex Besch.异名处理,其余4个种得到承认。     

中国东北地区藓类植物的一个新分布种

本文报导了东北地区藓类植物的一个新记录种:珠藓Bartramia halleriana Hedw     

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.