云南西部盈江县的娑罗双林及其群落学特点的研究

本文报道在滇西盈江县羯洋河谷发现的娑罗双林,到目前为止是我国少有的热带单优森林群落之一。这一发现不仅丰富了我国热带植被类型的资料,而且对研究我国与邻国植被之关系具有重大意义;同时也增添国产龙脑香科植物种类和热区之造林树种。 娑罗双树景颇语叫“行林坤”,系龙脑香料(Dipterocarpaceae)娑罗双属(Shorea)     

中国龙脑香科植物纪要

广义的龙脑香科是泛热带分布。中国有 5属 12种 ,其中 1种为引种栽培 ,产云南、广西、海南及西藏。本科分布北界在印度的喜马偕尔邦 ,在该地粗壮娑罗双Shorearobusta约达北纬 31°。《中国植物志》所报道见于我国的纤细龙脑香Dipterocarpusgracilis确实未见于我国。我国自然生长的东京龙脑香Dipterocarpusretusus依据毛被的多少可分为 2个变种 ,它们可能同时出现在同一林中。由于毛被多少不是区分种的可靠特征 ,因此将河内坡垒Hopeahongayanensis及多毛坡垒H mollissima两者都归并到狭叶坡垒H chinensis。鉴于雄蕊数目的不确定性 ,海南所产的Hopeaexalata与越南所产的H reticulata就视为同一种 ,而采用后者作为种名。版纳青梅Vaticaxishuangbannaensis与广西青梅V guangxiensis两者以叶脉数目来区分是不可靠的 ,也应视为同种而采用后者作为种名。经野外实地考察 ,望天树Parashoreachinensis仍应恢复其原来的学名。     

柬埔寨桔井省和实据省热带季雨林乔木层特征

采用标准样地法, 对柬埔寨桔井省斯努县、桔井县和实据(磅斯卑)省奥拉县的低地季雨林乔木层植物多样性、重要值和材积等特征进行了分析, 以期为深入了解柬埔寨热带森林的组成和生态学特征提供基础资料。结果表明: 3 个地区森林乔木树种的密度、平均胸径、基部盖度和平均材长均以斯努的样地最大, 桔井次之, 奥拉最低。乔木胸径以10-50 cm 为主, 材长以2-11 m 居多。3 地森林乔木优势种,斯努为副萼紫薇(Lagerstroemia calyculata)和交趾油楠(Sindora cochinchinensis), 桔井为香坡垒(Hopea odorata)、铁坡垒(H. ferrea)、钝形娑罗双(Shorea obtuse)和木荚豆(Xylia xylocarpa), 奥拉为钝叶龙脑香(Dipterocarpus obtusifolius)、钝形娑罗双和铁坡垒。不同地区森林总材积差异大, 斯努为388.176 m3·hm–2, 桔井247.217 m3·hm–2, 奥拉70.991 m3·hm–2, 总体上体现出3 地森林有各自独特的生态学特征。     

国产赖草属的分类修订

通过标本研究和野外考察,对中国赖草属（Leymus Hochst.）进行了分类修订。结果在中国共确认了3组、33种、7变种赖草属植物,其中多穗组包含4种,少穗组包含24种、7变种,单穗组包含5种,新报道的3个种和新修订的4个类群（即3个新组合和1个新名称）皆隶于少穗组。同时对赖草属的研究简史、属的形态特征和一些类群的地理分布也分别作了简要介绍。     

中国灯心草属植物的研究

本文通过对国产灯心草属植物的研究,提出了一个中国灯心草属分类系统排列,首次确认我国产6亚属,14组(包括10个新组),4个系(包括3个新系),77种(包括14个新种),l亚种(新亚种)和10变种(包括4个新变种),对其中一些种类作了归并及处理。     

中国粗叶木属(茜草科)植物的分类研究

本文修订了中国产粗叶木属植物,共记录31种、4亚种和10变种。其中,报道了一个新种、1个新亚种、2个新变种、8个新组合和9个分布新记录,新归并学名12个,并且对中国粗叶木属植物文献记载中的一些错误和混淆作了澄清。     

中国龙脑香科植物分类研究(二)

(二 )本篇对中国坡垒Hopea的 10个分类单元和越南的 2个分类单元作了分类论述 ,同时对它们作了系统排列。     

东亚粗叶木属（茜草科）植物纪要

修订了东亚茜草科粗叶木属植物,新归并１１个种名及２个变种名,建立１个新变种,３个新组合变种和１个新等级亚种。报道２个中国分布新记录种。讨论了一些易于混淆种的界限,以及探讨了一些种的植物地理意义。     

八角属植物的分类学订正

根据对18个国家和地区120个标本馆收藏的万余份八角属植物标本的研究,提出3个新组合,对13个种、6个亚种、3个变种和2个变型作了归并,确认全世界现有八角属植物34种3亚种和1变种。     

中国龙脑香科植物分类研究(三)

(三 )本篇包括 :(1)中国青梅属Vatica的五个分类单元作了分类论述 ;(2 )中国双翅龙脑香属Diptero carpus的 11个分类单元和邻国的 2个分类单元作了分类论述 ,同时对它们作了系统排列。其中有福建双翅龙脑香D .fujianensis化石植物新种 (中新世、佛昙 )及其首次发现     

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.