秋枫化学成分的研究

利用各种色谱技术从秋枫(Bischofia javanica)的根中分离得到11个化合物。通过波谱学方法鉴定为3,4-二羟基苯乙醇(1),2-(3,4-dihydroxy)-phenylethyl-O-β-D-glucopyranoside(2),tachioside(3),isotachioside(4),儿茶素(5),表儿茶素(6),没食子儿茶素(7),4-羟基-2-甲氧基苯酚1-O-β-D-(6’-O-没食子酰基)葡萄糖苷(8),4-hydroxy-3-methoxyphenol-β-D-[6-O-(4-hydroxy-3,5-dimethoxylbenzoate)]glucopyranoside(9),maesopsin-6-O-glucopyranoside(10),β-香树脂醇乙酸酯(11)。所有化合物均为首次从该种植物中分离得到。     

大蒜果树的化学成分

从大蒜果树（Dysaxylum hainanense Merr),树皮的乙醇提取物中分离得到10个化合物,通过波谱方法鉴定它们分别是（＋）evofolinB(1),20S,24-epoxy-24,25-dihydroxy-3,4-secodanmar-4(28)-en-3-oic acid(2),4(14)-eudesmene-6?,11-diol(3),stigmast-5-ene-3β－7a-diol(4),stigmast-5-en-eβ－ol lioleate(5),sitindosideI(6),methyl3,4-dihdroxy-benzoate(7),scopoletin(8),β-谷甾醇和胡萝卜甙,其中1为新化合物。     

芒果叶的化学成分研究

从芒果(Mangifera indica L.)叶中分离得到11个化合物,通过波谱数据分析分别鉴定为:芒果苷(1)、高芒果苷(2)、槲皮素(3)、没食子酸(4)、原儿茶酸(5)、没食子酸甲酯(6)、lingueresinol(7)、dihydrodehydrodiconiferyl alcohol (8)、1,3,6,7-tetrahydroxyxanthone(9)、5,7,3',4’-tetrahydroxy-2-methoxy-3,4-flavandione3-hydrate(10)、1-(4-hydroxy-3-methoxyphenyl)-2-[4-(w-hydroxypropyl-2-methoxy)-phenoxyl]-propane-l,3-diol(11).其中化合物7、8、10、11为首次从该植物中分离得到,化合物10的波谱数据为首次报道.     

地胆草的化学成分研究

对地胆草全草的化学成分进行研究。采用硅胶柱色谱、Sephadex LH-20以及半制备型高效液相色谱技术进行分离纯化,通过1D、2D NMR,MS等方法鉴定化合物的结构。结果从地胆草95%乙醇提取物中分离并鉴定了9个化合物,分别为1-[(2R*,3S*)-3-ethoxy-2,3-dihydro-6-hydroxy-2-(1-methylethenyl)-1-benzofuran-5-yl]ethanone(1)、7-hydroxy-6-acetyl-2-methylchromone(2)、matriisobenzofuran(3)、桦木酸(betulinic acid,4)、木犀草素(luteolin,5)、木犀草素-7-O-β-D-葡萄糖苷(luteolin-7-O-β-D-glucoside,6)、对香豆酸(p-coumaric acid,7)、3,4-二羟基苯甲醛(3,4-dihydroxy benzaldehyde,8)、豆甾醇-3-O-β-D-葡萄糖苷(stigmasterol-3-O-β-D-glucoside,9)。其中化合物1~3均为首次从该属植物中分离得到,化合物3在国内未见从其它植物中分离报道。     

云南兔耳草的化学成分研究

从云南兔耳草 (LagotisyunnanesisW .W .Smith)的乙醇提取物中分离得到 8个化合物 ,经波谱分析确定其结构分别为 :柯伊利素 (chrysoeriol 1) ,芹菜素 (apigenin 2 ) ,茴香酸 (anisicacid 3) ,β 谷甾醇 (β sitosterol4) ,肉桂酸 (cinnamicacid 5 ) 3,4 二甲氧基肉桂酸 (3 ,4 dimethoxycinnamicacid 6 ) ,香草醛(vanillin 7) ,胡萝卜苷 (daucosterol8)。以上化合物均为首次从该植物中分离得到。     

民族药四数九里香的化学成分及其细胞毒活性研究(Ⅲ)

阐释民族药四数九里香Murraya tetramera Huang的药效物质基础。本文采用现代色谱分离技术从其醇提取物的乙酸乙酯萃取部位中分离和纯化得15个化合物，采用核磁共振波谱技术和文献数据比对方法鉴定了化合物结构，分别为luteolin-7-O-glucoside(1)、3,4-dihydroxy benzeneacrylic acid(2)、2-hydroxylcinnamie acid(3)、3,8-dihydroxy-4-methoxy-coumarin(4)、2-methyl-6-hydroxychromone(5)、chlorogenic acid(6)、methyl caffeate(7)、furo[3,2-α]carbazole(8)、(E)-2-((4-hydroxyphenyl)diazenyl)phenol(9)、N-(2,6-dimethylphenyl)-N′-(4′-nitrophenyl)urea(10)、九里香碱(11)、phorbazole C(12)、3-羟苯基喹唑酮(13)、N-反式阿魏酰基-3-甲基多巴胺(14)、6-丙酮基-5,6-二氢血根...     

木荷茎中木脂素类化学成分研究

为了研究山茶科植物木荷(Schima superbaGardn.et Champ.)茎中的化学成分,采用硅胶柱层析、Sepha-dex LH-20、HPLC等色谱方法进行分离,NMR和MS等波谱学方法进行结构鉴定,从木荷茎中分离鉴定了9个木脂素类化合物,分别为丁香脂素(syringaresinol,1)、pinoresinol(2)、落叶松脂醇(lariciresinol,3)、balanophonin(4)、3-acetoxymethyl-5-[(E)-2-formylethen-1-yl]-2-(4-hydroxy-3-methoxyphenyl)-7-methoxy-2,3-dihydrobenzofuran(5)、4,9-dihydroxy-3,5′-dimethoxy-4′,7-epoxy-8,5′-neolignane-9′-yl acetate(6)、二聚松柏醇(dihydrodehydrodico-nifery alcohol,7)、异落叶松脂素(isolariciresinol,8)和1-(3,4-dimethoxyphenyl)-2-O-(2-methoxy-4-omegahydroxypropylphenyl)propane-1,3-diol(9)。以上木脂素类化合物均为首次从该植物分离得到。     

南海疏枝刺柳珊瑚中甾醇类化合物的研究

本文对采自海南三亚海域的疏枝刺柳珊瑚(Echinogorgia pseudossapo)化学成分进行研究,分离到11个甾醇类化合物。经波谱数据分析,分别鉴定为cholest-5-en-3β-ol(1),24-methylene-cholest-4-ene-3β,6β-diol(2),24-norcholesta-22-en-3β-ol(3),acanthovagasteroid A(4),calicoferol E(5),calicoferol F(6),6-hydroxy-cholest-4-ene-3-one(7),echinoflorasterol(8),echissaposterol(9),24-methylcholest-5-en-3β,7α-diol(10)和24-methylcholest-5,22(E)-dien-3β,7α-diol(11)。除化合物8外,其余化合物均首次从该种海洋动物中分离得到。     

苦竹内生真菌Fusarium sp. S13的化学成分研究(英文)

从苦竹内生真菌Fusarium sp.S13的发酵液提取物中分离得到8个化合物,通过波谱技术分别鉴定为:cerevisterol(1),(22E,24S)-24-methyl-5α-cholesta-7,22-diene-3β,5α,6β,9α-tetraol(2),ergosterol peroxide(3),3β,5α,9α-trihydroxy-6β-methoxyergosta-7,22-dien(4),ergosta-7,22-dien-6β-methoxy-3β,5α-diol(5),ergosta-4,6,8(14),22-tetraen-3-one(6),25-hydroxy-ergosta-4,6,8(14),22-tetraen-3-one(7),ergosta-7,22-dien-3β,6β-diol(8)。海虾致死实验结果显示化合物1-8均显示出不同程度的毒性。     

黄花三宝木枝条的化学成分研究II

为了解黄花三宝木(Trigonostemon lutescens Y.T.Chang et J.Y.Liang)的化学成分,采用硅胶柱色谱与Sephadex LH-20凝胶柱色谱从黄花三宝木乙醇提取物的石油醚与正丁醇萃取部分共分离11个化合物,其结构分别鉴定为:ent-kaurane-3β,16β-diol(1)、(3R,6R,7E)-3-hydroxy-4,7-megastigmadien-9-one(2)、palmarumycin JC2(3)、(±)-3-(3,4,5-trimethoxyphenyl)-1,2-propanediol(4)、赤式-愈创木基甘油-β-O-4′-松柏基醚(5)、苏式-愈创木基甘油-β-O-4′-松柏基醚(6)、3-hydroxymethyl-5-(3-hydroxypropyl)-7-methoxy-2-{3-methoxy-4-[1-(3,4-dimethoxybenzyl)-2-hydroxyethyl]phenyl}-2,3-dihydrobenzofuran(7)、ancistrocline(8)、hamatine(9)、东莨菪苷(10)和紫丁香苷(11)。上述化合物均为首次从该种植物中分离得到,其中化合物1、3~11为首次从该属植物中分离得到。     

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.