关于浙江泡果荠和棒毛荠的分类问题

再次对浙江泡果荠Hilliella warburgii和棒毛荠Cochleariella zhejiangensis作比较研究后,本文认为：两者差别明显,尤其是后者子房和果实表面密被发达的膜质棒状毛,又有各自不同的地理分布区,显然是不同属植物。棒毛荠属(单型属)的属名模式是Cochleariella zhejiangensis Y．H．Zhang et R．Vogt。     

浙江泡果荠一新变种

本文发表浙江泡果荠一新变种即白花浙江泡果荠Hilliella warburgii (O.E.Schulz) Y.H.Zhang et H.W.Li var,albiflora,sp.nov.     

湖南十字花科一新种

双牌泡果荠 新种 图1 砍莱(俗称) Hilliella shuangpaiensis Z. Y. Li, sp. nov. Species H. alatipedi (Hand. -Mazz.) Y. H. Zhang et H. W. Li et H. paradoxae (Hance) Y. H. Zhang et H. W. Li affinis, a qua foliis basalibus pinnatis 8—9-foliolatis, floribus minoribus, sepalis petalo subacquilongis, siliculis orbicularibus, 2 (-3) ovulatis differt.     

棒毛荠属——中国十字花科一新属

棒毛荠属 新属 Cochleariopsis Y.H.Zhang,gen.nov.(Trib.Sinapeae Subtrib.Cochle-ariinae) Genus Cochleariae L.arcte affinis,sed a qua differt valvulis pilis clavi-formibus pellucidis tectis aseptatis,et seminibus paucis Herba annua.Folia alterna,inferiora trifoliolata,superiora ternata.In-florescentiae racemosae,terminales et axillares.Flores minimi,pedicelli capil-lares;sepala oblonga;petala elliptica,unguibus brevibus;stamina longiora 4,     

十字花科四属植物叶片脉序的比较研究

对十字花科有争议的岩荠属Cochlearia,泡果荠属Hilliella,阴山荠属Yinshania,棒毛荠属Cochleariella植物的叶片脉序进行了研究。结果表明：岩荠属为环结曲行羽状脉,泡果荠属为直行羽状脉,阴山荠属为半直行羽状脉,棒毛荠属种的叶脉与浙江泡果荠相似。前3属植物在网眼的大小,叶缘末级脉和叶先端的形态上也存在着差异。据此作者认为岩荠属,泡果荠属和阴山荠属这3属植物分开是合理的,但棒毛荠属的分类地位值得进一步研究。还得出这几个属的叶脉演化关系是;基出完全掌状脉→环结曲行羽状脉→直行羽状脉。     

阴山荠属的研究

本文为阴山荠属和泡果荠属的分类研究提供了染色体数目试验结果。受试种类按染色体数目的分异形成两大类群,与按形态地理分类法得出的结果一致。阴山荠属(Yinshania):柔毛阴山荠Y.henryi,2n=12;叉毛阴山荠Y.fur-catopilosa,2n=12;乾宁阴山荠Y.qianningensis,2n=12;泡果荠属(Hiliela):昌化泡果荠H.changhuaensis.2n=42,奇异泡果荠H.paradoxa,2n=42;双牌泡果荠H.shuangpaiensis,2n=44;弯缺泡果荠H.sinuata,2n=44;黟县泡果荠H.yixianensis,2n=42。染色体数目结合形态学和地理分布研究,支持两属作为各自独立的属存在。本属是中国特有分布属,形态演化研究表明,本属阴山荠组是较原始的类群,小果组是较进化的类群。文中讨论了属中各种的分布规律和全属的分布特点,认为川西及其邻近地区是本属多样化中心和近代分布区中心,本属可能是从该地区,并随着新生代第三纪喜马拉雅造山运动和青藏高原的崛起,以及第四纪冰期、间冰期的迭次变化产生的全球性气候波动而分化迁移。本属基本上属亚热带、暖温带的半湿润半干旱生态类型。根据本属重要器官较稳定的特点,以及地区性特有成分较高的特点,认为本属是较古老的中国特有成分     

安徽泡果荠属(十字花科)一新种

黟县泡果荠 新种 图版1:A Hilliella yixianensis Y. H. Zhang, sp. nov. H. paradoxa (Hance) Y. H. Zhang et H. W. Li ab specie nova recedit foliolis ma-joribus, pedicellis brevioribus c. 2 mm longis sub fructu 2—3 mm longis, sepalis navicu-laribus majoribus c. 2 mm longis 1 mm latis, petalis longioribus (2. 8—3. 3 mm longis), sili-culis valvis irregularibus interdum praeditis.     

泡果荠属(十字花科)五新种

长柱泡果荠 图1 Hilliella longistyla Y.H.Zhang,sp.nov. Haec species proxima H.changhuaensi Y.H.Zhang,a qua racemis longio-ribus,laxioribus,siliculis longe obovoideis,stylis longioribus,sub fructu c.2mmlongis,seminibus superificie tuberculis minoribus dense munitis recedit. Herba annua.Caulis erectus,c.42cm vel ultra altus,2.5—3mm crassus,striatus,nodis hispidulis.Folia caulina mediana et suprema trifoliolata;foliolamembranacea vel chartacea,subtus et supra ad nervos strigosa,nervis lateralibus 5     

阴山荠属一新种兼论该属的演化和地理起源问题

本文描述了阴山荠屑一新种——鄂西阴山荠Yinshania exiensis Y.H.Zhang。新种隶阴山荠系,但形态特征介于阴山荠系的察隅阴山荠和密毛系的叉毛阴山荠之间,分布在鄂西一带。阴山荠属属下系统有2组2系,在研究了本属主要性状特征的演化方向后,本文认为阴山荠组是较原始的一群,小果组是较进化的一群。四川西部及其邻近地区是本属的近代分布区中心或分化中心,本属也可能是从该地区分化起源的。     

阴山荠属,泡果荠属,棒毛荠属和岩荠属的扫描电镜观察

以阴山荠属、泡果荠属、棒毛荠属和岩荠属的18种植物取用实验材料,对果实外表皮、种子外种皮、毛和花粉粒等特征鉴别器官进行扫描电镜观察,提供36张照片资料,并以检索性状比较属间特征,证明该4属作为各自独立的属是恰当的。     

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.