中国水青冈分布,生长和更新特点

中国水青冈分布、生长和更新特点吴刚（中国科学院生态环境研究中心,北京１０００８５）Ｄｉｓｔｒｉｂｕｔｉｏｎ,ＧｒｏｗｔｈａｎｄＲｅｖｅｇｅｔａｔｉｏｎａｌＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＦａｇｕｓｉｎＣｈｉｎａ．ＷｕＧａｎｇ（ＲｅｓｅａｒｃｈＣｅｎ...     

三七对血液系统作用的研究进展

三七,为五加科（Ａｒａｌｉａｃａｅ）植物人参三七Ｐａｎａｘｎｏｔｏｇｉｎｓｅｎｇ（Ｂｕｒｋ）Ｆ．Ｈ．Ｃｈｅｎ（Ｐ．Ｐｓｅｕｄｏｇｉｎｓｅｎｇ Ｗａｌｌ;Ｐ．ＳａｎｃｈｉＨｏｏ）的干燥根,别名田七．是我国名贵中草药之一,主要产于广西、云南等地。味甘微苦 ,性温。三七含有多种化学成分 ,其中三七皂甙 (简称ＰＮＧ)为主要有效成分之一 ,其含量８%～１２ %。ＰＮＧ中包括三七皂甙Ａ (Ｒ -Ａ) ,三七皂甙Ｂ (Ｒ -Ｂ) ,三七皂甙Ｃ(Ｒ -Ｃ) ,三七皂甙Ｄ (Ｒ -Ｄ１) (Ｒ -Ｄ２) ,三七皂甙Ｅ (Ｒ -Ｅ) ,三七皂甙Ｆ(Ｒ -Ｆ)。经理化常…     

桑白皮中抗人爱滋病病毒（HIV）成分研究

从中药桑白皮（ＭｏｒｕｓａｌｂａＬ．）的根皮中分离到６个成分,它们是：ｍｏｒｕｓｉｎ（１）,ｍｕｌｂｅｒｒｏｆｕｒａｎＤ（２）,ｋｕｗａｎｏｎＨ（３）,ｍｕｌｂｅｒｒｏｆｏｒａｎＫ（４）,ｋｕｗａｎｏｎＧ（５）,ｍｕｌｂｅｒｒｏｆｕｒａｎＧ（６）;并制备了它们的乙醚化合物和葡萄糖成;还测定了这些化合物的体外抗人爱滋病病毒（ＨＩＶ）活性和对人淋巴细胞的细胞毒活性,发现其中黄酮ｍｏｒｕｓｉｎ,ｋｕｗａｎｏｎＨ和ｍｏｒｕｓｉｎ４＇－ｇｌｕｃｏｓｉｄｅ具有一定的抗ＨＩＶ活性。     

中药柴胡不同采收期的皂甙含量

中药柴胡不同采收期的皂甙含量潘泽惠庄体德周雪林林湘（江苏省中国科学院植物研究所,南京２１００１４）（黑龙江双鸭山矿务局师范学校,双鸭山１５５１２５）ＯｎｓｅａｓｏｎａｌｃｈａｎｇｅｓｏｆｔｈｅｔｏｔａｌｓａｐｏｎｉｎｓｉｎＣｈｉｎｅｓｅｔｒａｄｉｔ...     

亚洲薄荷的两个化学型

亚洲薄荷的两个化学型桂新,周荣汉（安徽中医学院中药系合肥２３００３８）（中国药科大学植物化学分类研究室南京２１００３８）ＴｗｏｃｈｅｍｏｔｙｐｅｓｏｆＭｅｎｔｈａａｓｉａｆｉｃａＢｏｒｉｓｓ￥ＣｈｏｕＧｕｉ－Ｘｉｎ（ＡｎｈｕｉＣｏｌｌｅｇｅｏｆＴｒａ...     

人埃里希体的研究进展

人埃里希体包括３个种：Ｅｈｒｌｉｃｈｉａ ｓｅｎｎｅｔｓｕ、Ｅｈｒｌｉｃｈｉａ ｃｈａｆｆｅｅｎｉｓｉｓ和人粒细胞埃里希体（ＨＧＥ）。Ｅ．ｓｅｎｎｅｔｓｕ和Ｅ．ｃｈａｆｆｅｅｎｓｉｓ主要寄生在单核细胞和巨噬细胞内,而ＨＧＥ主要寄生在粒细胞内。ＨＧＥ和Ｅ．ｃｈａｆｆｅｅｎｓｉｓ的传播媒介是蜱。３种人埃里希体分属埃里希体属３个不同的１６Ｓ ｒＲＮＡ基因群。     

动脉平滑肌细胞sis／PDGF－B链的表达和调控

介绍平滑肌细胞ｓｉｓ／ＰＤＧＦ－Ｂ链表达和调控的进展。ｃ－ｓｉｓ原癌基因是ＰＤＧＦ－Ｂ的同源基因,将外源的ＰＤＧＦ基因导入哺乳类细胞是研究ＰＤＧＦ功能和调控的重要手段。内皮素、ＩＬ、ＴＮＦ、血管紧张素Ⅱ和蛋白激酶Ｃ可调节ｓｉｓ基因的表达。ｓｕｒａｍｉｎ和新霉素（ｎｅｏｍｙｃｉｎ）的人工合成为拮抗ＰＤＧＦ效应提供广阔的前景。ｃ－ｓｉｓ可通过激活ｃ－ｍｙｃ、ｃ－ｆｏｓ等原癌基因而促进细胞增殖。     

桑白皮中抗人爱滋病病毒成分研究

从中药桑白皮的根皮中分离到６个成分,它们是：ｍｏｒｕｓｉｎ（１）,ｍｕｌｂｅｒｒｏｆｕｒａｎ Ｄ（２）,ｋｕｗａｎｏｎ Ｈ（３）,ｍｕｌｂｅｒｒｏｆｕｒａｎ Ｋ（４）,ｋｕｗａｎｏｎ Ｇ（５）,ｍｕｌｂｅｒｒｏｆｕｒａｎ Ｇ（６）;并制备了它们的乙酰化合物和葡萄糖甙,还测定了这些化合物的体外抗人爱滋病病毒活性和对人淋巴细胞的细胞毒活性,发现其中黄酮ｍｏｒｕｓｉｎ,ｋｕｗａｎｏｎ Ｈ和ｍｏｒｕｓｉｎ     

植被类型图的绘制——以西藏植被图为例

植被类型图的绘制———以西藏植被图为例田新智（中国科学院植物研究所,北京１０００９３）ＭＥＴＨＯＤＳＩＮＤＲＡＷＩＮＧＭＡＰＯＦＶＥＧＥＴＡＴＩＯＮＴＹＰＥＴｉａｎＸｉｎｚｈｉ（ＩｎｓｔｉｔｕｔｅｏｆＢｏｔａｎｙ,ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳ...     

细胞衰老揭秘

细胞衰老揭秘为研究Ｗｅｒｎｅｒｓ综合征发病的基因机制,分子生物学家Ｇｕａｒｅｎｔｅ和Ｄａｖｉｄｓｉｎｃｌａｉｒ利用酵母Ｓａｃｃｈａｒｏｍｙｃｅｓｃｅｒｅｖｉｓｉａｅ进行研究。这是因为Ｗｅｒｎｅｒｓ的特征是早衰,而酵母Ｓａｃｃｈａｒｏｍｙｃｅｓｃｅ...     

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.