鳞毛蕨科四个属的染色体数目

报道了鳞毛蕨科的4个属(毛枝蕨属Leptorumohra、石盖蕨属Lithostegia、黔蕨属Phanerophlebiopsis和柳叶蕨属Cyrtogonellum)6种植物的染色体数目及生殖方式。其中柳叶蕨Cyrtogonellum fraxinellum 'n'=123, 2n=123; 离脉柳叶蕨C. caducum 'n'=123; 斜基柳叶蕨C. inaequalis 2n=123; 四回毛枝蕨Leptorumohra quadripinnata n=41; 石盖蕨Lithostegia foeniculacea 2n=164; 长叶黔蕨Phanerophlebiopsis neopodophylla 2n=82。石盖蕨属、黔蕨属和柳叶蕨属的染色体数目为首次报道。结果表明这3个属的染色体基数和鳞毛蕨科中其他属一样均为x=41。细胞学证据支持将石盖蕨属、黔蕨属置于鳞毛蕨科的处理。本文还发现柳叶蕨属与贯众属Cyrtomium的一些种一样, 具有无融合生殖方式, 而其他3个属仅具有在蕨类植物中较为常见的有性生殖方式。     

湖南鳞毛蕨属(鳞毛蕨科)一新种

描述了鳞毛蕨属一新种,即吉首鳞毛蕨Dryopteris jishouensis G.X.Chen et D.G.Zhang.吉首鳞毛蕨与稀羽鳞毛蕨Dryopteris sparsa(Buch.-Ham.ex D.Don)O.Ktze.相似,区别在于本新种形体较小,通常高5³6cm,羽片近对生或互生,裂片边缘全缘且顶端钝圆而无尖齿,囊群盖边缘啮蚀状.     

浅裂鳞毛蕨地上部分化学成分研究

从鳞毛蕨属植物浅裂鳞毛蕨Dryopteris sublaeta Ching et Hsu．地上部分首次分离得到5个化合物,运用波谱技术确定其结构分别为：β-谷甾醇（1）,邻苯二甲酸-双（2-乙基庚基）酯（2）,叶绿醇（3）,银松素（3,5-二羟基二苯乙烯）（4）,3-羟基二苯乙烯-5-O-β-D-葡萄糖苷（5）。     

一些中国蕨类植物的细胞学观察

本文报道12种中国产蕨类植物的细胞学情况,其中9种的染色体数目是第一次被计数,它们是四川峨眉山产的月牙铁线蕨 Adiantum edentulum n=30、直立假蹄盖蕨 Athyriopsiserecta n=40、九老洞鳞毛蕨 Dryopoerris julaodongensis“n”=82(及n=41?)、稀羽鳞毛蕨 Dryopteris sparsa var.nitidula n=41、粉红方秆蕨 Glaphyropteridopsis rufostraminea n=36、芒齿耳蕨 Polystifhum hecatopteron n=41、披针叶新月蕨 Pronephrium penangiana n=36和北京产的麦秆蹄盖蕨 Athyrium fallaciosum n=40(及“n”=80?)、河北峨眉蕨 Luna-thyrium ucgetius n=80。麦秆蹄盖蕨和新种九老洞鳞毛蕨在同一植株上的不同孢子囊里,分别产生32个和64个两种孢子数目,说明它们可能是有性生殖和无融合生殖兼性的二倍体种。荚果蕨 Matteuccia struthiopteris 的观察结果表明这个属的染色体基数(x)是39。其他2个种的观察结果是:团羽铁线蕨 Adiantum capillus-iunonis n=30和北京铁角蕨 Asplenium pe-kinense n=72。     

东北鳞毛蕨科植物叶比较解剖的初步研究

对东北鳞毛蕨科（Dryopteridaceae)鳞毛蕨属（Dryopteris)6种,耳蕨属（Polystichum)3种植物的叶片及叶柄解剖构造进行了观察和比较研究,结果表明：某些叶片及叶柄的结构特征是鳞毛蕨科植物较稳定的 遗传性状,可以做为鉴定植物种及属的依据。     

广西爬树蕨属两种植物的细胞分类学研究

首次报道了中国广西产两种爬树蕨属植物的染色体数目及繁殖方式。爬树蕨和桂南爬树蕨的染色体数目都是n=40,2n=80(2x); 每个孢子囊的孢子数为64,是有性生殖二倍体。结合已有资料对爬树蕨属中的系统位置进行了讨论。     

中国蕨类植物志中两色鳞毛蕨学名的纠正

两色鳞毛蕨（Dryopteris bissetiana（Baker）C．Chr．）在中国是比较常见和熟知的一种蕨类植物。《中国植物志》和《云南植物志》中采用的是一不合法的学名。在此给予纠正。     

云南鳞毛蕨属泡鳞亚属的分类研究

本文修订了鳞毛蕨属泡鳞亚属的特征范围,对该亚属的2个组12个种进行了分类研究,发现其中有新种1个,云南新分布的种5个。本文还对长期混淆不清的Dryopteris labordei与D．gymnosora 的分类特征还进行了清理,恢复前者为独立存在的种。     

鳞毛蕨科3种植物配子体发育的研究

利用光学显微镜详细观察鳞毛蕨科(Dryopteridaceae)3属3种植物,即耳蕨属的棕鳞耳蕨(Polystichum polyblepharum)、鳞毛蕨属的黑足鳞毛蕨(Dryopteris fuscipes)和鞭叶蕨属的鞭叶蕨(Cyrtomidictyum lepidocaulon)配子体发育过程,记录配子体各发育阶段的特征。结果表明:棕鳞耳蕨、黑足鳞毛蕨和鞭叶蕨的孢子都为单裂缝,孢子萌发类型为书带蕨型,配子体发育类型为三叉蕨型,性器官为薄囊蕨型,成熟原叶体为对称的心脏形,具毛状体;3属的属间差异包括孢子颜色、孢子纹饰、萌发时间、丝状体长度、片状体形状、毛状体和假根等特征,上述特征在属间存在交叉现象,因此,孢子形态和配子体发育特征不能作为区分耳蕨属、鳞毛蕨属和鞭叶蕨属的形态依据。     

贡嘎山鳞毛蕨属新资料

报道了贡嘎山鳞毛蕨属一新种─—贡嘎鳞毛蕨（Ｄｒｙｏｐｔｅｒｉｓｇｏｎｇｇａｅｎｓｉｓ）和该属的２个四川新记录种。     

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.