中国海南岛13种菊科植物的细胞学研究

对海南岛13种菊科植物进行了染色体研究,对其中9种植物进行了核型分析,结果为: 树菊Tithoni-a diversifolia A.Gray,2n=34=26m+8sm（2sat）;鳢肠Eclipta prostrata（L.）L.,2n=22=18m+4sm;金腰箭Synedrella nodiflora（L.）Gaertn.,2n=40=6m+30sm（2sat）+4st;三叶鬼针草黄花类型Bidens pilosa L.（yel-low flower）,2n=72=46m+26sm（2sat）;羽     

云南无量山四种报春花属植物的核型研究

研究了云南无量山报春花属(Primula)3组4种植物的核型。体细胞中期染色体的数目和核型分别为：波缘报春P.sinuata Franch,2n=2x=22-20m(2SAT)_ 2st,着丝点端化值(T．C．％)为57．51％;无葶脆蒴报春P.sinoexscapa C.M.Hu,2n=2x=22=20m 2sm,T.C.％值为57．78％;滇北球花报春P．denticulata ssp.sinodenticulata (Balf.F.et Forrest)W.W.Smith,2n=2x=22=20m(4SAT) 2st,T.C.%值为56.79%;光叶景东报春P.interjacens var.epilosa C.M.Hu,2n=2x=18=2m(2SAT) 6sm(4SAT) 10st,T.C.%值为67.47%。简要讨论了报春花属植物可能的染色体原始基数和3个组的染色体基数。     

5种桤木属植物的核型分析

利用改良去壁低渗法对桦木科（Betulaceae）桤木属（Ainus Mill.）东亚地区5种植物进行染色体数目与核型研究。结果显示：所试验物种中染色体形态比较一致,多是由中部（m）及近中部（sm）着丝点染色体组成。其中A.nitida染色体数为2n=28,核型公式为K（2n）=28=22m 4sm(2SAT) 2st(2SAT);A.hirsuta染色体数为2n=42,核型公式为K(2n)=42=36m 6sm; A.cremastogyne,A.formosana 染色体数均为2n=56,核型公式分别为K(2n)=56=2M 40m(1SAT) 14sm(1SAT)和K(2n)=56=46m 8sm 2st;A.firma染色体数为2n=112,核型公式为K(2n)=112=80m 28sm 4st。     

国产磨芋属的染色体核型报道(1)

本文报道了磨芋属(Amorphophallus Blume)六个种的染色体数目和核型,其中5个种属于首次报道。其核型公式如下: 1.滇磨芋 K(2n)=2x=26=26m.2.磨芋 K(2n)=2x=26=26m.3.攸落磨芋K(2n)=2x=26=22m(2SAT)+4sm.(2SAT).4.西盟磨芋 K(2n)=2x=26=20m+4sm+2st.5.勐海磨芋 K(2n)=2x=26=22m+4sm.6.白磨芋 K(2n)=2x=26=20m(2SAT)+6sm。     

贵州产蜘蛛抱蛋属植物的细胞分类学研究

报道了6种贵州产蜘蛛抱蛋属植物的染色体数目和核型,并与其相应近缘种对比,联系植物的外部形态特征,探讨核型结构与形态特征的相关性.发现1个种的染色体数目为2n =36,5个种的染色体数目为2n =38,核型公式分别为:平塘蜘蛛抱蛋(Aspidistra pingtangensis),2n =38 =20m +4sm(2sat) +14st;荔波蜘蛛抱蛋(A.liboensis),2n =38 =22m(2sat)+4sm+ 12st;赤水蜘蛛抱蛋(A.chishuiensis),2n =38 =22m(2sat)+8sm +8st;伞柱蜘蛛抱蛋(A.fungilliformis),2n =36=18m (2sat) +4sm+ 14st;四川蜘蛛抱蛋(A.sichuanensis),2n =38 =22m (2sat) +4sm +12st;丛生蜘蛛抱蛋(A caespitosa),2n =38 =20m +6sm(2sat) +12st.核型类型都为2C型.其中平塘蜘蛛抱蛋、荔波蜘蛛抱蛋和赤水蜘蛛抱蛋的染色体数目和核型均为首次报道.研究结果表明,该属植物的核型结构与外部形态特征具有一定的相关性,细胞分类学研究可以为该属植物起源进化研究以及自然分类鉴定提供一定的依据.     

五种苏铁属植物的核形态

报道了苏铁属（Cycas L.)5种植物的染色体数目和核型,除多歧苏铁外,其他种均为首次报道。5个种的体细胞中期染色体核型公式分别为：滇南苏铁C.diannanensis K(2n)=2x=22=2m 4sm 4st 12T;潭清苏铁C.tanqingii K(2n)=2x=22=2m 8sm 2st 10T;多歧苏的Cmultipinnata K(2n)=2x=22=4m 8st 2st 8T;巴兰萨苏铁C.balansae K(2n)=2x=xx=2m 4sm 6st 10T。石山苏铁C.miquelii K(2n)=22=2m 6sm(1SAT) 4st 10T;核型均属于3B型。本研究结果支持苏铁属植物的核型从不对称进化的观点;同时,支持将巴兰萨苏铁和石山苏铁归入攀枝花苏铁组的台湾苏铁亚组的观点。     

甘肃萱草属植物的核型研究

本文研究了甘肃萱草属6种、1变种的染色体核型;黄花菜K(2n)=22=12m+10sm(2SAT);小黄花菜K(2n)=22=10m+12sm;北萱草K(2n)=22=8m+14sm;北黄花菜K(2n)=22=14m+6sm+2st;萱草K(2n)=22=12m+8sm+2st;重瓣萱草K(2n)=33=18m+12sm+3st:折叶萱草K(2n)=22=10m+10sm+2st。以上核型可自然地分成两大类群,第一类群包括小黄花菜、北萱草、黄花菜;第二类群包括折叶萱草、萱草、重瓣萱草、北黄花菜。     

11个四倍体赖草属物种的核型研究

对11个四倍体赖草属Leymus Hochst.物种的核型进行了研究,核型公式如下：沙生赖草L. arenarius (L.) Hochst., 2n=4x=28=18m+4sm+6st (4sat); 密穗赖草L. condensatus (J. Presl) A. Lve, 2n=4x=28=22m+4sm (2sat)+2st (2sat); 新生赖草L. innovatus (Beal) Pilg., 2n=4x=28=24m (4sat) +4sm (2sat);多枝赖草L. multicau     

伞形花科5种主要蔬菜作物的核型分析

采用卡宝染色压片法对伞形花科5种主要蔬菜作物进行了核型分析和比较.结果表明:芹菜的核型公式为K(2n)=2x=22=6m+2sm+8st+6t,染色体核型为"3B"型;芫荽的核型公式为K(2n)=2x=22=2m+2sm+18st,染色体核型为"3A"型;茴香的核型公式为K(2n)=2x=22=14m+6sm+2st,染色体核型为"2B"型;水芹的核型公式为K(2n)=2x=22=6m+6sm+10st,染色体核型为"3A"型;胡萝卜的核型公式为K(2n)=2x=18=6m+10sm+2st,染色体核型为"2A"型.并对他们的亲缘关系、遗传多样性进行了探讨.     

八个四倍体鹅观草属物种的核型研究

对8个鹅观草属物种的核型进行了研究。核型公式如下:纤穗鹅观草2n=4x=28=20m+8sm(2sat);紫穗鹅观草2n=4x=28=22m(2sat)+6sm;假花鳞草2n=4x=28=24m(2sat)+4sm;肃草2n=4x=28=22m+6sm(2sat);小颖鹅观草2n=4x=28=22m+6sm(2sat);纤瘦鹅观草2n=4x=28=24m(4sat)+4sm;变颖鹅观草2n=4x=28=20m+8sm(2sat);毛花鹅观草2n=4x=28=24m(2sat)+4sm。它们的核型属1A或2A型。其中后5个物种的核型为首次报道。     

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.