云南广西三叉蕨科二新种

云南广西三叉蕨科二新种周厚高，朱维明（广西农业大学，南宁５３０００５）（云南大学，昆明６５００９１）关键词三叉蕨科，滇桂三相蕨，桂滇肋毛蕨，云南，广西ＴＷＯＮＥＷＳＰＥＣＩＥＳＯＦＡＳＰＩＤＩＡＣＥＡＥＦＲＯＭＹＵＮＮＡＮＡＮＤＧＵＡＮＧＸＩ￥ＺＮＯ...     

广西石灰岩地区蕨类新植物

广西石灰岩地区蕨类新植物周厚高,黎桦,黄玉源（广西农业大学,南宁５３０００５）关键词桂南爬树蕨;广西耳蕨;节毛耳蕨;石灰岩地区;广西ＮＥＷＳＰＥＣＩＥＳＯＦＰＴＥＲＩＤＯＰＨＹＴＥＦＲＯＭＬＩＭＥＳＴＯＮＥＡＲＥＡＯＦＧＵＡＮＧＸＩ￥ＺｈｏｕＨｏｕｇ...     

山东产蹄盖蕨科2属植物形态解剖学的研究

采用光镜和扫描电镜对山东分布的蹄盖蕨科2属(蹄盖蕨属和假蹄盖蕨属)7种植物的根、根茎、叶柄、叶轴、叶表皮、表皮毛和孢子囊进行了形态解剖学的系统研究.结果表明,在形态解剖学方面2属植物的共同特征为:根均为无髓中柱;叶柄基部的双柱型维管束向上渐靠近联合形成1个周韧型维管束;叶上下表皮垂周壁均呈波状;气孔主要为胞环型、周胞型或极附型.2属植物的不同特征是:蹄盖蕨属植物体无毛;而假蹄盖蕨属植物叶片和叶轴上均生有腺毛;蹄盖蕨属植物根皮层外侧为薄壁细胞,假蹄盖蕨属则为棕色厚壁细胞环.研究结果表明蹄盖蕨科为一个自然分类群,并支持假蹄盖蕨属的成立.     

直立介蕨是假蹄盖蕨属的成员

对直立介蕨Dryoathyrium erectum (Z. R. Wang) W. M. Chu &; Z. R. Wang与介蕨属Dryoathyrium、假蹄盖蕨属Athyriopsis的叶、毛、孢子囊群和孢子的形态进行了比较研究。直立介蕨叶轴和羽轴上的沟槽不明显、具有单列细胞的节状毛、孢子囊群有双生一脉, 以及孢子的形态等特征与假蹄盖蕨属植物相似。结合叶绿体DNA trnL-F区序列分析结果, 所有形态及分子资料均表明该种植物应属于假蹄盖蕨属, 应恢复其原名直立假蹄盖蕨Athyriopsis erectum Z. R. Wang。     

贵州冷蕨属一新种

贵州冷蕨属一新种王筱英王培善（贵州科学院,贵阳５５０００１）ＡＮＥＷＳＰＥＣＩＥＳＯＦＣＹＳＴＯＰＴＥＲＩＳ（ＡＴＨＹＲＩＡＣＥＡＥ）ＦＲＯＭＧＵＩＺＨＯＵＷａｎｇＸｉａｏｙｉｎｇ,ＷａｎｇＰｅｉｓｈａｎ（ＧｕｉｚｈｏｕＡｃａｄｅｍｙｏｆＳｃｉｅｎｃ...     

黑龙江省蹄盖蕨科（Athyriaceae）植物的RAPD分析及其系统学意义

在形态分类研究的基础上,利用RAPD技术,对黑龙江省蹄盖蕨科植物6属9种共15个种群进行了遗传多样性分析,分析结果表明：（1）假冷蕨属应包括在蹄盖蕨属中（2）角蕨属与蹄盖蕨属,羽节蕨属与冷蕨属亲源关系较近（3）短肠蕨属为独立一属,与其它属亲源关系较远。根据黑龙江省蹄盖蕨科植物的DNA水平的研究结果,再结合其形态学特征,建议将黑龙江省蹄盖蕨科划分为3个亚科：冷蕨亚科（Cystopterioideae）包括2个属：冷蕨属（Cystopteris）和羽节蕨属（Cemnocarpium）。蹄盖蕨亚科（Athyrioideae）包括3个属：蹄盖蕨属（Athyrium）、假冷蕨属（Pseudocystopteris）和角蕨属（Cornopteris）。双盖蕨亚科（Diplazioideae）包括短肠蕨属（Alhntodia）。     

黑龙江省蹄盖蕨科(Athyriaceae)植物的RAPD分析及其系统学意义

在形态分类研究的基础上,利用RAPD技术,对黑龙江省蹄盖蕨科植物6属9种共15个种群进行了遗传多样性分析,分析结果表明：（1）假冷蕨属应包括在蹄盖蕨属中（2）角蕨属与蹄盖蕨属,羽节蕨属与冷蕨属亲源关系较近（3）短肠蕨属为独立一属,与其它属亲源关系较远。根据黑龙江省蹄盖蕨科植物的DNA水平的研究结果,再结合其形态学特征,建议将黑龙江省蹄盖蕨科划分为3个亚科：冷蕨亚科(Cystopterioideae)包括2个属：冷蕨属(Cystopteris)和羽节蕨属(Gymnocarpium)。蹄盖蕨亚科(Athyrioideae)包括3个属：蹄盖蕨属(Athyrium)、假冷蕨属(Pseudocystopteris)和角蕨属(Cornopteris)。双盖蕨亚科(Diplazioideae)包括短肠蕨属(Allantodia)。     

假冷蕨属孢子形态研究

利用光学显微镜和扫描电子显微镜对假冷蕨属4种植物的孢子进行了详细观察,并与亲缘关系较近的冷蕨属、蹄盖蕨属植物孢子形态进行比较。结果表明,假冷蕨属孢子均为单裂缝,两侧对称,极面观为椭圆形,赤道面观为肾形,周壁表面具不规则脊状褶皱,连接成网状。假冷蕨属与蹄盖蕨属孢子形态特征相似,亲缘关系较近。     

山东假蹄盖蕨属植物孢子形态研究

本文采用了光学显微镜和扫描电子显微镜对山东分布的4种假蹄盖蕨(其中鲁山假蹄盖蕨Athyriopsis lushanensis J.X.Li,sp.nov.和山东假蹄盖蕨A.sh-andongensi,J.X.Li et Z.C.Ding,sp.nov.为新种[1],中日假蹄盖蕨A.kiusianum(Koidz.)Ching为我国新记录)孢子形态进行了系统的观察,其孢子周壁纹饰在种间有着显著的差异,为其种间分类提供了孢粉学的依据。     

九种蹄盖蕨科植物配子体的酯酶同工酶分析

本文培养了蹄盖蕨科９个种即中华蹄盖蕨（Ａｔｈｙｒｉｕｍｓｉｎｅｎｓｅ）带岭蹄盖蕨（Ａ．ｄａｌｉｎｇｅｎｓｅ）、多齿蹄盖蕨（Ａ．ｍｕｌｔｉｄｅｎｔａｔｕｍ）（包括青柄和紫柄２种带岭蹄蕨类型）、东北蛾眉蕨（Ｌｕｎａｔｈｙｒｉｕｍｐｙｃｎｏｓｏｒｕｍ）、朝鲜介蕨（Ｄｒｙｏａｔｈｙｒｉｕｍｃｏｒｅａｎｕｍ）、山冷蕨（Ｃｙｓｔｏｐｔｅｒｉｓｓｕｄｅｔｉｃａ）、假冷蕨（Ｐｓｅｕｄｏｃｙｓｔｏｐｔｅｒｉｓｓｐｉｎｕｌｏｓａ）、欧洲羽节蕨（Ｇｙｍｎｏｃａｒｐｉｕｍｄｒｙｏｐｔｅｒｉｓ）和黑鳞短肠蕨（Ａｌａｎｔｏｄｉａｃｒｅｎａｔａ）的配子体为材料,进行酯酶同工酶的分析,以表明它们的种间差异,其中多齿蹄盖蕨的青柄和紫柄两种类型的酶谱存在明显差异,应考虑紫柄为多齿蹄盖蕨的变型。     

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.