鸡屎藤挥发油化学成分的研究

利用气相色谱－质谱联用（ＧＣ／ＭＳ）技术对鸡屎藤挥发油化学成分进行分析研究,初步鉴定了３１种成分,它们占挥发油总量的７７．１６％,其中含量友上的有乙氧戊烷、乙酸异戊酯、苯甲醛、己酸乙酯、甲酸苯甲酯、乙酸苯甲酯、乙酸－２－苯乙酯、５,６,７,７ａ－四氢－４,４,７ａ－三甲基－２（４Ｈ）－苯并呋喃酮、十五碳酸乙酯、十六碳酸和癸酸异戊酯等１１种成分。     

园柏挥发油化学成分的GC—MS分析

利用毛细管气相色谱保留指数定性、标准样品叠加和色谱－质谱－计算机联用技术,对园柏挥发油的化学成分进行了分离和鉴定,共鉴定出单萜烃１６个、倍半萜烃１８个,并测得了各化合物的相对含量。其主要成分是：香桧烯、α－蒎烯、萜品醇－４、柠檬烯、γ－萜品烯和对一花烃。     

长叶水麻挥发性化学成分研究

长叶水麻（Ｄｅｂｒｅｇｅａｓｉａ ｌｏｎｇｉｆｏｌｉａ （Ｂｕｒｍ．ｆ．）Ｗｅｄｄ．）是荨麻科植物,果可食,根入药,除风湿。本文彩毛细管气相色谱－质谱联用法对长叶水麻挥发性化学成分进行了研究,经毛细管色谱分离出１０８个峰,共确认了其中８３种成分。用气相色谱面积归一化法测定了各成分的相对百分含量,分析鉴定结果表明,长叶水麻挥发油主要化学成分为丁基化羟基甲苯、十五烷、邻苯二甲酸二丁酯、２,６－二甲基奈     

银木叶精油化学成分的研究

用毛细管气相色谱-质谱-计算机联用技术、毛细管气相色谱保留指数法和标准品叠加法分析了银木叶精油的化学成分。从分离出来的250个成分中,初步鉴定出59个成分,其含量占总组成的97.27％。最主要成分是樟脑(28.57％)等。     

湿地蒿挥发油成分研究

目的:分析湿地蒿的化学成分. 方法:采用水蒸气蒸馏法提取,运用毛细管气相色谱-质谱联用法对湿地蒿挥发性化学成分进行了分析,用气相色谱面积归一化法测定了各成分的相对百分含量. 结果:经毛细管色谱分离了38个峰,并鉴定出峰所对应的化合物.其主要化学成分为7,11-二甲基-1,6,10-十二碳三烯(56.20%);IR-α-蒎烯(18.63%);3-(苯二甲酰亚氨甲基)-苯甲酸(4.8%);1-甲基-4-(1-甲基乙基)-1,4-环己二烯(3.46%);6,6-二甲基-2-亚甲基-[3,1,1]二环庚烷(1.41%);庚烷(1.28%)等.     

长叶水麻挥发性化学成分研究

长叶水麻(Debregeasia longifolia (Burm.f.) Wedd.)是荨麻科植物,果可食,根入药,除风湿。本文采用毛细管气相色谱_质谱联用法对长叶水麻挥发性化学成分进行了研究,经毛细管色谱分离出108个峰,共确认了其中83种成分。用气相色谱面积归一化法测定了各成分的相对百分含量,分析鉴定结果表明,长叶水麻挥发油主要化学成分为丁基化羟基甲苯、十五烷、邻苯二甲酸二丁酯、2,6-二甲基奈、癸酸乙酯、十八烷、丁二酸二乙酯、3,7-二甲基-1,6辛二烯-3-酮等,化合物类型以烃、脂肪酸和酯、醇、酮、芳香和芳香杂环化合物为主。     

中国特有的反式－甲基异丁香酚新资源植物

中国特有植物银木和阔叶樟集中产于湖北西南部山区,资源丰富,其鲜叶经水蒸汽蒸馏获得重油（比重大于水）,分别使用毛细管气相色谱／质谱／计算机联用方法进行化学成分分析。结果表明：这两种精油的主成分均为反式－甲基异丁香酚,含量分别高达85．71％和94．04％。     

中国特有的反式－甲基异丁香酚新资源植物

中国特有植物银木和阔叶樟集中产于湖北西南部山区,资源丰富,其鲜叶经水蒸汽蒸馏获得重油（比重大于水）,分别使用毛细管气相色谱／质谱／计算机联用方法进行化学成分分析。结果表明：这两种精油的主成分均为反式－甲基异丁香酚,含量分别高达85．71％和94．04％。     

茶树挥发油化学成分的研究

采用毛细管气相色谱-质谱(CGC-MS)联用技术对茶树挥发油的化学成分进行研究,经毛细管气相色谱分离出47个峰,共确认了其中39种成分,占总油量的97％。其主要成分是4-甲基-1-(1-甲乙基)-3-环己烯-1-醇、1-甲基-4-(1-甲乙基)-1,4-环己烯、桉叶油素、( )-4-蒈烯等。     

北艾蒿挥发油成分研究

采用水蒸气蒸馏法提取,运用毛细管气相色谱-质谱联用法对北艾蒿挥发性化学成分进行了分析,用气相色谱面积归一化法测定了各成分的相对百分含量。经毛细管色谱分离出26个峰,并鉴定出峰所对应的化合物。其主要化学成分为(Z,Z)-3,5-辛二烯(63.99%);2,5-辛二烯(10.08%);3,4,5-三甲基-1-己烯(3.55%);桉油醇(2.84%);长叶薄荷酮(2.36%);3-甲基-2-环己烯-1-酮(2.37%);樟脑(2.32%);十氢-1,1,7-三甲基-4-亚甲基-1H-奥(2.13%)等。     

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.