浙江被子植物新资料

我们在整理浙江植物标本过程中,发现3个新种;1个新变种和1个新组合种、即浙江虎耳草Saxifraga zhejiangensis Z.Wei et Y.B.Chang,sp nov.,斑叶异药花Fordiophyton maculatum C.Y.Wu ex Z.Wei et Y.B.Chang,sp.nov.,浙江开唇兰Anoectochilus Zhejiangensis Z.Wei et Y.B.Chang,sp.nov.,大西坑水玉簪Burmannia cryptopetala Makino var.daxikangensis Y.B.Chang etZ.Wei var.nov.,单花帚菊Perfya cordilolia Mattf.var.desmocephala(Diels)Z.Wei et Y.B.Chang,stat.nov.。     

浙江杜鹃花属新植物

本文发表了浙江产的杜鹃花属的两种新植物,即泰顺杜鹃Rhodo-dendron taishunense B.Y.Ding et.Y.Y.Fang;崖壁杜鹃Rhodo-dendron saxatil,B.Y.Ding et Y.Y.Fang.     

珠芽蓼种群克隆多样性及克隆结构的初步研究

珠芽蓼(Polygonum viviparum)是青藏高原东缘广泛分布的克隆植物,具有有性和无性(根状茎和珠芽)两种生殖方式。该研究采用RAPD技术对分布于不同海拔的珠芽蓼7个自然种群进行了克隆结构和克隆多样性(是单克隆种群还是多克隆种群)以及克隆多样性与海拔因子之间的相关性研究,为了解高山克隆植物对环境的适应性策略及揭示克隆植物的繁殖和分布特点提供科学依据。研究结果表明:1)采用13条RAPD引物对珠芽蓼7个种群共140个样本进行扩增分析,共扩增到117个位点,其中多态性位点84个,多态位点百分率PPL达到71.79%,检测到43个基因型,且全部为局限型基因型;2)与Ellstrand和Roose(1987)总结的克隆植物的克隆多样性平均值相比(PD=0.17,D=0.62),珠芽蓼种群克隆多样性水平稍高,Simpson指数平均为0.639,基因型比率PD平均为0.307;3)克隆结构分析表明,珠芽蓼种群内克隆之间的镶嵌明显,这可能与珠芽蓼过渡型的克隆构型有关。研究中珠芽蓼种群的构型有游击型、密集型以及这两者之间的过渡类型;4)采用SPSS软件对珠芽蓼种群的克隆多样性与海拔高度进行相关性分析,结果显示它们之间并无明显的相关性。     

浙江产新植物

本文发表了浙江产的两种新植物,即具鞘皿果草Omphalotrigonotis vaginata Y.Y.Fang及建德獐牙菜Swertic jiendcensis Y.Y.Fang。     

关于Miyamayomena simplex和M. angustifolia(Asteraceae)命名人的更正

Miyamayomena simplex和M.angustifolia是陈艺林(Y.L.Chen1986)根据Aster simplex Chang(1935a)和A.angustifolius Chang(1935b)Asteraceae,(Astereae)更名的。后者是A.simplex Willdenow(1809)和A.angustifolius Jacquin(1798)的异物同名,因此不符合国际植物学命名法规第72条款的规定。陈的更名应处理为1986年的新名Miyamayomena simplex Y.L.Chen和M.angustifolia Y.L.Chen。     

夏蜡梅属花粉形态的研究

本文首次报道了夏蜡梅(Calycanthus chinensis)花粉的扫描电镜观察结果,并与西美国蜡梅(C.occidentalis)、美国蜡梅(C.floridus)的作了比较,表明前者较为原始,后者比较进化,夏蜡梅属(Calycanthus L.)可能以夏蜡梅起源于东亚(中国),与从细胞学、形态学等得到的结果一致。鉴于夏蜡梅与西美国蜡梅、美国蜡梅在许多性状上的较大差异,作者认为以Sinocalycanthus chinensis (Cheng et S.Y.Chang) Cheng et S.Y.Chang为模式种的单型属Sinocalycanthus Cheng et S.Y.Chang也许应予确认。     

中国产穿心莲属(爵床科)植物修订

本文修订了中国产穿心莲属植物,新组合华裸柱草[Gymnostac-hyum sinense(Lo)H.Chu,comb.nov]和一变种腺毛须药草(Androgra-phis laxiflora(Bl.)Lindau var.glomeruliflora(Bremek.)H.Chu,comb.nov.),华穿心莲(Andrographis sinensis Lo)为半裸柱草的异名,宽丝爵床(Haplanthoides yunnanensis H.W.Li)和勐仑须药草(Andrographis monglunensis Chang et H.Chu)二者系腺毛须药草的异名。云南种子植物名录中所载的卵叶须药草(Andrographis ovata auct.non Benth.:C.Y.Wu,1984.)非穿心莲属植物,而是叉序草[Isoglossa collina(T.Anderson)B.Hansen]。     

江西省种子植物3种新记录

报道江西省种子植物3个新记录种(变种),即大别五针松Pinus fenzeliana Hand.-Mazz. var. dabeshanensis (C. Y. Cheng et Y. W. Law) L. K. Fu et Nan Li、浙江凤仙花Impatiens chekiangensis Y. L. Chen和浙江金线兰Anoectochilus zhejiangensis Z. Wei et Y. B. Chang。它们均发现于幕阜山脉中段江西省修水县和武宁县境内。文中简述各新记录种的区系地理学意义。     

浙江杜鹃花属一新种

本文发表了浙江杜鹃花属一新种,即华顶杜鹃Rhododendron huadingense B. Y. Ding, et Y. Y. Fang。     

东北蒿属一新种

本文发表了产于东北的蒿属一新种,即肇东蒿Artemisia zhao-dongensis G.Y.Chang et M.Y.Liu。     

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.