陕西缓步动物二新纪录种记述

记述了陕西省2个缓步动物新纪录种,它们是毕氏假棘影熊虫Pseudechiniscus facettalis(异缓步纲,棘影科)和介小生熊虫Minibiotus intermedius(真缓步纲,高生熊虫科)。     

江西省缓步动物四个新纪录种记述

本文报道了江西省缓步动物4个新记录种:双裂角棘影熊虫Cornechiniscus lobatusRamazzotti,1943(异缓步纲,棘影熊虫科),节值大生熊虫Macrobiotus harmsworthiMurray,1907(真缓步纲,大生熊虫科),胡氏大生熊虫Macrobiotus hufelandiSchultze,1833(大生熊虫科)和杜氏高生熊虫Hypsibius dujardiniDoyére,1840(高生熊虫科)。     

吉林和湖北缓步动物二新纪录

记述了吉林省和湖北省2个缓步动物新纪录。它们是Macrobiotus harmsworthi Murray,1907;Macrobiotus hufelandi Schultze,1833。2个种同属于缓步动物门(TaNigrada)、真缓步纲(Eutardigrada)、并爪H(Parachela)、大生熊虫科(Macrobiotidae)、大生熊虫属(Macrobiotus)。     

缓步动物门三新种及一新记录种记述

记述了得自云南省和河南省苔藓与丝状绿藻中的缓步动物门三新种和一新记录种:异缓步纲棘影熊虫科的西藏角棘影熊虫新记录种 Cornechiniscus tibetanus)Maucci, 1979)和石林假棘影熊虫,新种 Pseudechiniscus shilinensis sp. nov.;真缓步纲大生熊虫科的河南趾生熊虫,新种 Dactylobiotus henanensis sp. nov.;高生熊虫科的昆明高生熊虫,新种 Hypsibius kunmingensis sp. nov..       

四川省缓步动物2新纪录种记述

记述了四川省绵阳缓步动物2个新纪录种。它们是缓步动物门（Tardigrada）、真缓步纲（Eutardigrada）、近爪目（Parachela）、大生熊虫科（Marcobiotidate）,Doryphoribius属的Doryphoribius qinlingensis Li,Su＆Yu和缓步动物门、异缓步纲（Heterotardigrada）、棘影目（Echiniscoidea）、棘影科（Fchiniscidae）、角棘影属（Cornechiniscus）的Cornechiniscus lobatus Ramazzotti。     

中国缓步动物门二新种及三新纪录种和亚种(异缓步纲,棘影熊虫科;真缓步纲,小斑熊虫科,大生熊虫科,高生熊虫科)

记述采自河南省洛阳市、湖北省京山县和四川省都江堰市的缓步动物门2新种及3新纪录种和亚种：异缓步纲棘影熊虫科的四棘棘影熊虫,新纪录Echiniscus quadrispinosus Richters,1902;真缓步纲小斑熊虫科的都江小斑熊虫,新种Milnesium dujiangensis sp.nov,大生熊虫科的节值大生熊虫戴冠亚种,新纪录Macrobiotus harmsworthi coronatus Barros,1942;高生熊虫科的大指等高熊虫,新纪录Isohypsibius macrodactylus(Maucci,1978)和京山等高熊虫,新种Isohysibius jingshanessis sp.nov.     

陕西省陆生缓步动物系统分类组成研究

缓步动物是一类微小的水生无脊椎多细胞动物,在系统分类上独列一门,与节肢动物有着较近的亲缘关系。目前,缓步动物门分为3纲、5目、13科、110多个属,超过1 250种。本文简要介绍了陕西省缓步动物门的系统分类研究进展,初步分析了陕西省缓步动物的分类组成。在陕西省已描述发表的缓步动物种类107种,隶属于2纲、3目、4科、17属。此外,展望了陕西省缓步动物区系分类的研究方法、研究方向和研究意义。     

中国裸子植物的多样性和地理分布

<正>郑万钧和傅立国(1978)在《中国植物志》(FRPS)第七卷中将裸子植物分为4纲12科。这4个纲分别是苏铁纲、银杏纲、松杉纲和盖子植物纲,对应于Pilger(1926)的4个目,与Pilger和Meilchior(1954)的不同在于把银杏科从苏铁纲中独立为银杏纲,红豆杉科从松杉纲中独立为红豆杉纲(附表1)。FRPS记载中国产裸子植物有11科,分别是苏铁科(Cycadaceae)、银杏科(Ginkgoaceae)、松科(Pinaceae)、杉科(Taxodiaceae)、柏科(Cupressaceae)、罗汉松科(Podocarpaceae)、三尖杉科(Cephalotaxaceae)、南洋     

不同海拔缓步动物群落结构的比较

为研究海拔对缓步动物群落结构的影响,对地处秦岭北坡的南五台山缓步动物群落进行了初步调查研究.调查设置3个样区、45个样方,共采集缓步动物919个,个体密度平均816.89个·m-2,隶属缓步动物门2纲2目3科7属11种.其中Macrobiotus hufelandi和M.harmsworthi共占总采量的92.93%,为优势类群.采用Simpson指数、Shannon-Wiener信息指数、Pielou均匀度指数和修正的Hill指数来计算各生境缓步动物群落结构特点.研究表明,海拔对缓步动物群落结构有一定的影响.随着海拔的下降其物种的个体数量、群落优势类群的数量和优势物种数都呈下降趋势;物种多样性的变化趋势为中海拔地区＞低海拔地区＞高海拔地区,而群落优势度的变化趋势完全相反;不同海拔样区的群落相似性较低.     

熊虫

熊虫是缓步动物门的俗称,是生活在多种生境里的微后生动物,有一明显的头节和四个不明显的躯干“体节”,两侧有四对具爪的腿,主要分为异缓步纲和真缓步纲,前者根据体表不同开头和数量的角皮甲板以及头部成对的触须分类,后者根据吸烟板状物的数量和排列,腿末端爪的形态以有及卵壳壁上的花纹分类。     

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.