安徽蔷薇科新植物

<正> 与原变种的区别在于叶柄较长,长5—10厘米,顶生小叶柄长2厘米,顶生小叶先端长尾尖,基部心形,花梗较短,长1.5—3厘米,子房微具腺毛。     

中国黄耆属两个新变种

本变种与原变种的区别是:小叶通常减少为7片,长10—17毫米;总状花序着生6—7花;植株矮小,高仅6厘米。产四川西北部石渠县洛须公社;生于海拔3300米的草地上。     

铁甲秋海棠一新变种

本变种与原变种的区别,在于叶大,卵状心形,长20—28厘米,宽15—20厘米,叶基偏斜,上表面密被长柔毛状刚毛,背面密被白色短柔毛,沿叶缘具深绿色环状条纹。 云南:昆明,昆明植物园,栽培。1985年8月,郑若仙85-01(模式,存中国科学院昆明植物研究所标本室)。     

江西盐肤木属一新变种

本变种与原变种的区别在于叶长20-40厘米;小叶较大,长5-14厘米,宽2-6(6.5)厘米,下面近基部沿中脉两侧被黄褐色长柔毛,侧脉腋内有淡黄褐色髯毛,侧脉多达15对。     

广西槭属一新变种

<正> 本变种与原变种的区别在于本变种的叶较大,常宽15～17厘米,长23～27厘米,基部偏斜近于心脏形;侧脉较少,7～8对,边缘具有疏钝锯齿,叶柄较短而粗壮,长4.5～5厘米,无毛;翅果较大,小坚果长圆形,直径5～7毫米;翅宽1.1～1.5厘米,连同小坚果长3～3.5厘米,常张开成钝角或近于水平,区别显著。花期不明,果期8月。     

国产植物新资料

与原变种的区别在于,叶甚长且聚花果较大。叶长5米以上,宽约5厘米;聚花果长18厘米,直径12厘米,由近300枚核果组成,每一核果长3.3厘米,宽约1.2厘米。     

杨柳科新植物

与原变种的区别为果序长达40厘米,非24厘米,果较大,长1.6-1.9(非1-1.7厘米),无梗(非有梗)等。     

对萼猕猴桃一新变种

<正> 长柄对萼猕猴桃 新变种 Actinidia valvata Dunn var.longipedicellata L.L.Yu,var.nov. A vsr.valvata recedit pedicellis longioris 3.5—4cm longis,floribus majori-bus petalis 2 cm longis. 与原变种相异特征是花柄较长,长达3.5—4厘米;花较大,花瓣长达2厘米。 Zhejiang(浙江):Ningbo(宁波),L.L.Yu 8163(Type！IBK)。     

中国岩黄耆属新分类群

本变种与原变种的区别在于植株高40-100厘米,小叶13-19,卵形,长13-16毫米,宽6-9毫米。     

云南山茶属新植物

本变种与原变种(C. euphlebia)的区别在于花瓣较薄;外轮花丝在基部呈束状合生。花药基着;花萼内面具白色柔色。果较大,球形,直径4—8厘米,3室,3爿裂,果壳厚7—8毫米,每室有种子1—4颗,近球形或具角棱,黑褐色,密被褐色绢毛。花期10—12月,果期翌年8月。     

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.