中国小树蛙属一新种及海南冬季两栖爬行动物调查(图版Ⅰ)

2004年1月在海南省进行了两栖爬行动物调查,共获得20种和1新种。在吊罗山采到小树蛙成体,与眼斑小树蛙P．ocellatus Liuand Hu的体形、体色、鼓膜等特征相近,但有以下主要区别：胫跗关节前伸超过吻端,额部有2～3个银白色小斑点,背中部有一极明显的浅棕色椭圆形斑,腹面黄白色,前臂背侧具有2～3条横纹,故将该蛙定为新种。     

大树蛙与斑腿树蛙的繁殖与驯养

1997～2000年,在广州动物园生态蛙蟾馆观察与研究了笼养条件下大树蛙和斑腿树蛙的繁殖行为和驯养过程,比较了两种树蛙繁殖生态的差别。     

二种蛙类染色体核仁组织者的银染观察

本研究观察了斑腿树蛙和武夷湍蛙的Ag-NOR_s。其中斑腿树蛙的一对Ag-NOR_s出现在No-10染色体的长臂中间区。武夷湍蛙中,除No-6染色体长臂近着丝点区有一对Ag-NOR_s外,No-12上也有一对略小的Ag-NoR_s,这反映了Ag-NOR_s的扩增现象。从与某些近缘种相比较的结果表明,这两种蛙的次缢痕和Ag-NoR。位置,均具有本物种的特性,并且,在次缢痕与Ag-NOR_s之间有对应关系,但不是绝对的(武夷湍蛙No-11上未见有次缢痕区)。     

基于16S rRNA序列推断红蹼树蛙、棱皮树蛙和白斑小树蛙的非单系性

测定了4个种(红蹼树蛙、黑蹼树蛙、白斑小树蛙和红吸盘小树蛙)共11个种群的16S rRNA基因片段。双斑树蛙、马来棱皮树蛙、越南棱皮树蛙以及日本溪树蛙的同源序列通过GenBank检索获得。去除所有插入、缺失及模糊位点后,比对序列长度为500bp,其中变异位点115个,简约信息位点92个。以日本溪树蛙为外群,运用Bayesian法、MP法和ML法构建了系统发育树。结果表明红蹼树蛙和白斑小树蛙在种级水平上均不是单系。红蹼树蛙海南种群与双斑树蛙亲缘关系更近,并且来自云南不同地理种群的红蹼树蛙可以分为两大支系;越南棱皮树蛙与红吸盘小树蛙聚为一支,马来棱皮树蛙嵌套在白斑小树蛙不同地理种群中。进而认为白斑小树蛙是马来棱皮树蛙的同物异名,建议将红吸盘小树蛙并入棱皮树蛙属。     

三种不同科属蛙类外周血细胞的比较

采用快速瑞氏-姬姆萨(Wright's-Giemsa's)染色法对斑腿泛树蛙(Polypedates megacephalus)和沼水蛙(Hylarana guentheri)的外周血细胞进行观察,并与北部湾棱皮树蛙(Theloderma corticale)己有的数据进行了比较.结果显示,三种蛙的血细胞均由红细胞、白...     

基于16S rRNA序列推断红蹼树蛙、棱皮树蛙和白斑小树蛙的非单系性

测定了4个种（红蹼树蛙、黑蹼树蛙、白斑小树蛙和红吸盘小树蛙）共11个种群的16S rRNA基因片段。双斑树蛙、马来棱皮树蛙、越南棱皮树蛙以及日本溪树蛙的同源序列通过GenBank检索获得。去除所有插入、缺失及模糊位点后，比对序列长度为500 bp, 其中变异位点115个, 简约信息位点92个。以日本溪树蛙为外群，运用Bayesian法、MP法和ML法构建了系统发育树。结果表明红蹼树蛙和白斑小树蛙在种级水平上均不是单系。红蹼树蛙海南种群与双斑树蛙亲缘关系更近，并且来自云南不同地理种群的红蹼树蛙可以分为两大支系；越南棱皮树蛙与红吸盘小树蛙聚为一支，马来棱皮树蛙嵌套在白斑小树蛙不同地理种群中。进而认为白斑小树蛙是马来棱皮树蛙的同物异名，建议将红吸盘小树蛙并入棱皮树蛙属。     

宝兴泛树蛙和昭觉泛树蛙的染色体学研究,兼论两种的分类现状

本文选择宝兴泛树蛙模式标本产地四川宝兴居群（背部有斑点和无斑点两种类型）、大瓦山居群、瓦屋山居群,也选择了被命名为昭觉泛树蛙的模式标本产地四川昭觉的居群,共两种泛树蛙4个居群的5类52号标本,进行染色体组型、次缢痕及Ag-NORs研究。本文结果主要有三：1、首次报道宝兴泛树蛙地模标本的染色体组型,且证明背部有斑点与无斑点个体在染色体学方面没有显著区别;因此将过去文献上对宝兴泛树蛙色斑的描述作了补充。2、对昭觉泛树蛙昭觉居群的研究,证实吴贯夫与曾晓茂（1994）关于昭觉居群是与宝兴泛树蛙形态虽然相似,但染色体特征之间有极显著差别的另一个种,但按照“优先权律”,本文正式恢复刘承钊根据昭觉燕窝塘标本命名的胡氏泛村蛙学名的有效性,同时将吴与曾命名的昭觉泛树蛙学名作为前者的次定同物异名。3、本文所研究的宝兴泛树蛙属于广泛分布的种,建议有必要补充其它居群（如四川巴塘居群）的染色体学资料,再作进一步的分析是否尚有隐存种（或亲缘种）的存在。     

中国的树蛙科动物并记树蛙属一新种（图版Ⅶ，Ⅷ）

本文首先对树蛙科动物的特征加以简要介绍。其次对近年在海南岛野外工作期间采集的树蛙科动物一种18雄3雌加以研究,在对其外部形态观察研究的基础上,初步判断它们隶属树蛙属,又将其中雌雄各一号的肩带及前肢制成双色骨骼标本,发现其肩胸骨基部深分叉,指骨末节游离端分叉甚深且呈“Y”形,证明它们确系树蛙属动物无疑。经详细研究和比较,确定它们是树蛙属中的一个新种,现对此新种进行描述和报道。     

中国浙江发现树蛙属一新种（两栖纲：树蛙科）

依据形态特征比较和分子系统发育分析,将采自浙江丽水的树蛙属物种订为一新种——丽水树蛙Rhacophorus lishuiensis Liu,Wang and Jiang,sp.nov.。新种丽水树蛙主要鉴别特征为:1)体型较小,雄性体长34.2~35.8 mm,雌性体长45.9 mm;2)鼓膜直径大于眼径之半;3)后肢较短,胫跗关节前伸贴体达眼后角;4)背面光滑,无明显疣粒;5)生活时背面绿色,无斑或散有稀疏的浅蓝绿色细点;6)咽喉部白色,虹彩黄色;7)雄性具单咽下内声囊,第一指基部具浅黄色婚垫。依据线粒体基因12S rRNA、tRNAval和16S rRNA共2 038 bp序列以贝叶斯法构建树蛙属41个物种间的系统发育关系,新种丽水树蛙为一个独立的支系,并与绿背树蛙(R.dorsoviridis)支系以高支持率形成姐妹群(后验概率1.00),支长较长。     

云南8种树蛙的染色体组型比较研究

本文报道了云南８种树桂的染色体组型,并对目前所已知的树蛙种类的染色体组型进行了比较。锯腿小树蛙Ｐｈｉｌａｕｔｕｓｃａｖｉｒｏｓｔｒｉｓ（Ｇｕｅｎｔｈｅｒ）的２ｎ＝２６,５对大染色体和８对小染色体,９Ｍ＋４ＳＭ,ＮＦ＝５２,Ｎｏ．７长臂近着丝粒处和Ｎｏ．８短臂端部备有一个次缢痕;白颊小树蛙Ｐｈｉ．ｐａｌｐｅｂｒａｌｉｓＳｍｉｔｈ的２ｎ＝２６,５对人染色体和８对小染色体,８Ｍ＋５ＳＭ,ＮＦ＝５２,Ｎｏ．６短臂近着丝粒处有一个次缢痕。白颌大树蛙Ｒｈａ．ｍａｘｉｍｕｓＧｕｅｎｔｈｅｒ的２ｎ＝２６,５对大染色体和８对小染色体,９Ｍ＋４ＳＭ,ＮＦ＝５２;棕褶树蛙Ｒｈａ．ｆｅａｅＢｏｕｌｅｎｇｅｒ的２ｎ＝２６,５对大染色体和８对小染色体,９Ｍ＋４ＳＭ,ＮＦ＝５２;黑蹼树蛙Ｒｈａ．ｒｅｉｎｗａｒｄｔｉｉ（Ｂｏｉｅ）的２ｎ＝２６,５对大染色体和８对小染色体,９Ｍ＋４ＳＭ,ＮＦ＝５２,Ｍｏ．１短臂近着丝粒处有一个次缢痕;红蹼树蛙Ｒｈａ．ｒｈｏｄｏｐｕｓＬｉｕｅｔＨｕ的２ｎ＝２６,５对大染色体,１对中染色体和７对小染色体,９Ｍ＋４ＳＭ,ＮＦ＝５２;斑腿泛树蛙Ｐｏｌｙｐｅｄａｔｅｓｍｅｇａｃｅｐｈａｌｕｓ的２ｎ＝２６,５对大染色体     

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.