小麦耐盐突变体的RAPD分析

以冀麦２４和其耐盐的一代８９０１－１７为材料,用ＲＡＰＤ技术对其进行比较分析研究。在的用的２１５个引物中有５１个扩增出多态性,既有量的差异又有质的差异,初步断定此５１个引物扩增出的多态性与突变有关,为进一步用ＢＳＡ方法细筛出与耐盐突变体紧密连锁的ＲＡＰＤ分子标记下打下基础,同时,还分析了影响ＲＡＰＤ扩增结果的因素。     

小麦耐盐突变体的分子生物学鉴定

利用F1花药培养、EMS诱变和耐盐性反复筛选后已稳定9代的小麦耐盐突变体RH8706-49、H8706-34、H8706-44、H8706-48、H8706-57及其亲本濮农3665、百农3039为材料,用生化标记（醇溶蛋白）及分子标记（RAPD）分析了各材料间的差异,发现突变体与亲本相比,不仅发生了蛋白质水平的变异,而且也在DNA水平上证明了突变的发生,从而为耐盐突变体的真实性提供了有力的证据,排除了盐适应的可能性; 经用218 个引物对5个突变体之间的多态性进行RAPD分析,结果表明,它们之间的差异很小,其遗传背景相似,因而它们是一系列耐盐性不同的近似等位基因系。 Abstract:　In this paper, 5 wheat salt tolerant mutants（H8706-34、H8706-44、H8706-48、RH8706-49、H8706-57）derived from anther culture、EMS induction and salt tolerance selection and their parents （Punong3665、Bainong3039）were used as materials, all the mutants have inherited stably for 9 generations. Differences were revealed between the mutants and their parents using chemical marker（gliadin）and molecular marker（RAPD）, the results showed that compared with the parents, the mutants varied not only on the protein level,but also on the DNA level,which supplied hard evidence of the truth of the mutants and ruled out the possibility of salt adaptation. RAPD analysis were conducted among the 5 mutants by 218 primers,which proved they were a series of near isogenic lines of different salt tolerance because of their little difference and similar genetic background.     

传染性法氏囊病病毒中国强毒株A节段cDNA基因的克隆和序列分析

以来自哈尔滨传染性法氏囊病病毒（ＩＢＤＶ） 强毒株（Ｈａｒｂｉｎ 毒株,Ｈ） 的基因组ＲＮＡ为模板,用反转录聚合酶链反应（ＲＴ－ ＰＣＲ） 的方法得到了其Ａ 节段的全长ｃＤＮＡ 片段,分５＇端（１ ６５９ｂｐ） 和３＇端（１ ４４４ｂｐ） 上下两段分别克隆到ｐＧＥＭＢ○Ｒ － Ｔ 载体上,测定了其核苷酸顺序,在长为３ １０１ ｂｐ 中含有两个阅读框ＯＲＦＡ１ 和ＯＲＦＡ２ ,分别编码１ ０１２ 个氨基酸的前体蛋白（ＶＰ２ － ４ －３） 和１４５ 个氨基酸的ＶＰ５,ＯＲＦＡ１ 和ＯＲＦＡ２ 有部分的重叠。将核苷酸序列及推测出的氨基酸序列与已报道的ＩＢＤＶ 血清Ⅰ型和Ⅱ型毒株的相应序列进行了比较,结果表明：Ｈ 毒株与其它血清Ⅰ型毒株之间,在核苷酸水平上存在２５ｂｐ － ２６７ｂｐ 的差异;在氨基酸水平上存在１７ ～４０ 个氨基酸的差异。在ＶＰ２ － ４ － ３ 内比较显示,Ｈ 毒株与Ｐ２ 、Ｃｕ－ １ 之间氨基酸的差异最小为１ ．７％ ,Ｈ 毒株与ＵＫ６６１ 之间氨基酸的差异最大为３ ．９ ％ 。变异主要发生在ＶＰ２ 的可变区（２０６ － ３５０ 位氨基酸） ,在Ｈ 毒株所特有的１２ 个氨基酸当中,该区就占５ 个,代表１ ．７６ ％ 的变异。ＶＰ４、ＶＰ３ 和ＶＰ５区各有     

大麦6H染色体特异性标记的筛选和鉴定

从大麦、小麦和小麦－大麦６Ｈ染色体附加系ＲＡＰＤ分析筛选出对６Ｈ染色体特异的２个ＲＡＰＤ标记,转换为特异性ＰＣＲ标记,利用标记对不同植物材料进行ＰＣＲ扩增鉴定。表明凡含有大麦６Ｈ染色体的材料（Ｂｅｔｚｅｓ、Ｉｇｒｉ、ＣＳ６Ｈ附加系）均能扩增出特异带;而不含６Ｈ染色体的材料,包括小科、黑麦、长穗偃麦草、中间偃麦草、簇毛麦以及含有其他大麦染色体的小麦附加系均不主增出特异带。可见,２对ＰＣＲ引物具有大麦     

栽培稻F1花粉不育基因座S—a的分子定位

以栽培稻品种台中６５及其等基因Ｆ１不育系ＴＩＳＬ４为材料,用ＲＦＬＰ和ＲＡＰＤ等技术,对Ｆ１花粉不育基因座Ｓ－ａ定位。通过用ＲＦＬＰ和ＲＡＰＤ方法对亲本间进行多态性分析,发现亲本间的多态性很低,说明经多代回交后,在等基因系基因组中供体亲本的ＤＮＡ片段所占的比例很小。通过连锁分析,将Ｓ－ａ定位在第１染色体。Ｓ－ａ与分子标记ＣＤＯ５４８、Ｏ１１－１０００、ＲＧ１４６和Ｙ１３－５００之间的遗传距离分别为     

r－干扰素对喉癌细胞系HEP－2HLA－DR抗原和增殖细胞核抗原表达的影响

本实验用人重组ｒ－干扰素（ｒｈｕ－ＩＦＮ）作用ＨＥＰ－２细胞后ＨＬＡ－ＤＲ抗原和增殖细胞核抗原（ＰＣＮＡ）表达的检测来探讨ｒ－干扰素对ＨＥＰ－２细胞ＨＬＡ－ＤＲ抗原表达诱导作用及体外抗增殖活性。用单克隆抗体ＣＲ３／４３（抗ＨＬＡ－ＤＲ）和Ｋｉ－６７（抗ＰＣＮＡ）。以链霉素一生物素技术（ＬＳＡＢ）检测ＨＥＰ－２细胞ＨＬＡ－ＤＲ抗原和ＰＣＮＡ表达,结果显示：ｒ－ＩＥＮ诱导ＨＬＡ－ＤＲ抗原和抑制ＰＣＮＡ表达其强弱与ｒ－ＩＦＮ剂量有关。资料提示：ｒ－ＩＦＮ不仅对ＨＥＰ－２细胞有细胞毒作用,同时能调节其细胞膜特性,因而在喉癌的治疗中是有效的。     

RAPD标记构建水稻分子连锁图

利用随机扩增多态性ＤＮＡ（ＲＡＰＤ）,在一个水稻（Ｏｒｙｚａ ｓａｔｉｖａ Ｌ．）的双单倍体（ＤＨ）群体中发展分子标记,仅用５２ 个ＲＡＰＤ标记建成了一个水稻ＲＡＰＤ分子连锁图。该图覆盖基因组的总长度为８９８．４ ｃＭ （ｃｅｎｔｉｍ ｏｒｇａｎ）,标记间的平均间距为１７．３ ｃＭ,它能与用同一群体构成的ＲＦＬＰ图谱互相补充     

九个水稻耐盐突变体的RFLP分析

用６ 个可能与水稻耐盐性有关的ＤＮＡ 探针对来自两个品系的５ 个耐盐突变株系、３ 个耐盐突变体及１ 个弱耐盐突变体进行ＲＦＬＰ分析。结果有８ 个耐盐突变体（株系）检测到ＤＮＡ 水平的变化,６ 个探针检测到具多态性的突变株系（体）的数目分别为ＲＧ４：６ 个;ＲＧ７１１：６ 个;Ｒａｂ１６：５ 个;Ｒａｂ１０Ｅ６：２ 个;Ｒａｂ２１：１ 个;ＳａｌＴ：２ 个;表明ＲＧ４、ＲＧ７１１ 及Ｒａｂ１６三个位点有可能与耐盐性突变相关。多态性图谱中７０．８％ 为２ 个以上的酶切图谱同时显示多态性,说明多数突变是由缺失、插入或重复造成的     

u-PA/t-PA嵌合型纤溶酶原激活剂(ut-PA)的构建、表达、纯化和性质研究

将尿激酶原（ｐｒｏ－ＵＫ）ｃＤＮＡ和组织型纤溶酶原激活剂（ｔ－ＰＡ）Ａ链ｃＤＮＡ克隆到Ｍ１３ｍｐ１８中,经过二次寡核甘酸诱导的大片段定点删除和一次寡核苷酸诱导的多位点突变,得到ｕ－ＰＡ（Ｌｅｕ１４４－Ｇｌｙ４０８）／ｔ－ＰＡ（Ｓｅｒ１－Ｔｈｒ２６３）（ｕｔ－ＰＡ）融合基因．将ｕｔ－ＰＡ融合基因克隆到表达载体ｐＣＭ－βｎｅｏ中,与ｐＣＭ－ｄｈｆｒ共转染ＣＨＯ／ＤＨＦＲ－细胞,筛选稳定表达株．收集无血清表达上清,经苯甲脒柱纯化得到ｕｔ－ＰＡ纯品,ＳＤＳ－ＰＡＧＥ和纤维蛋白自显影显示ｕｔ－ＰＡ有两种分子量形式,分子量分别为６８ｋＤ和６１ｋＤ．纤维蛋白亲和性试验表明,ＬＵＫ（低分子量尿激酶）对纤维蛋白没有亲和性,而含有ＬＵＫ的ｕｔ－ＰＡ则对纤维蛋白表现出很强的亲和性,但ｕｔ－ＰＡ的亲和性略低于亲本ｔ－ＰＡ．     

小单孢菌细胞壁中3－OHDAP的快速分析

本文介绍了用微结晶纤维素簿板层析对小单孢菌（Ｍｉｃｒｏｍｏｎｏｓｐｏｒａ）细胞壁中二氨基庚二酸（ＤＡＰ）异构体及其３－羟基衍生物（３－ＯＨＤＡＰ）进行快速分析的方法。在甲醇：水：冰乙酸：吡啶（１０：５：０．２５：１）的溶剂系统中测得Ｒ_{ＬＬ－ＤＡＰ}：ｍｅｓｏ－ＤＡＰ为０．８８,ＤＤ－ＤＡＰ为０．７８,３－ＯＨＤＡＰ为０．７２。     

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.