赤胫散化学成分的研究

采用乙醇提取,硅胶柱层析分离和波谱方法鉴定结构,从赤胫散(Polygonum runcinatum Buch.-Ham.var.sinense Hemsl.)中分离出8个化合物,通过波谱数据分别鉴定为3,3′,4′-三甲基鞣花酸(1),3,3′-二甲基鞣花酸(2),3,3′,4-三甲基鞣花酸-4-O-β-D-葡萄糖(3),3,3′-二甲基鞣花酸-4-O-β-D-葡萄糖(4),没食子酸(5),没食子酸乙酯(6),邻苯二甲酸二(2-乙基)己酯(7),胡萝卜苷(8),所有化合物均为首次从该植物中分得.     

尾巨桉化学成分的研究

运用多种色谱手段分离纯化尾巨桉的化学成分,并通过波谱法对分离到的化合物进行结构鉴定。结果表明：从尾巨桉叶和根中分离并鉴定了5个化合物,分别为鞣花酸(ellagic acid,1)、3-O-甲基并没食子酸(3-O-methylellagic acid,2)、3,3′-O-二甲基鞣花酸(3,3′-di-O-methylellagic acid,3)、3-O-甲基鞣花酸4′-O-α-L-吡喃鼠李糖苷(3-O-methylellagic acid 4′-O-α-L-rhamnopyranoside,4)、反式对羟基肉桂酸((E )-p-hydroxy-cinnamic acid,5)。其中,化合物2~5为首次从该植物中分离得到。     

钝叶水丝梨化学成分研究

自钝叶水丝梨(Sycopsis tutckerii Hemsl)树皮中得到二十一个化合物。经鉴定为豆甾烷-6α-羟基-3β-月桂酸酯(Ia);豆甾烷-6α-羟基3β-肉豆蔻酸酯(Ib);豆甾烷-6α-羟基-3β-棕榈酸酯(Ic);及其它两个豆甾烷-6α-羟基-3β-脂肪酸酯(Id、Ie,其酸部分结构待定);乙酰白桦脂酸甲酯(Ⅱa);乙酰白桦脂酸(Ⅱb);白桦脂酸甲酯(Ⅱc);白桦酯酸(Ⅱb);乙酰齐墩果酸(Ⅲa);齐墩果酸(Ⅲb);β-谷甾醇(Ⅳa);β-谷甾醇-β-D-葡萄糖甙(Ⅳb);3-O-甲基-鞣花酸-4'-α-L-鼠李糖甙(Ya);3-O-甲基鞣花酸(Vb);3,4-二-O-甲基鞣花酸(Vc);鞣花酸(Vd);(?)-茶儿茶素(Ⅵ);没食子酸(Ⅷa);原儿茶酸(Ⅷd);焦性没食子酚(Ⅶc)。其中Ia-Ie是一组尚未单离的新化合物。上述化令物,除( )-茶儿茶素外,均系首次从水丝梨属植物中发现。     

南岭栲叶多酚类化学成分的分离与鉴定

采用Sephadex LH-20、MCI gel CHP 20P和Toyopearl Butyl-650C等柱色谱及半制备液相色谱技术,从壳斗科(Fagaceae)锥属(Castanopsis)植物南岭栲(Castanopsis fordii Hance)叶子乙醇提取物中分离得到18个多酚类化合物,运用波谱学方法解析鉴定为:没食子酸(1)、没食子酸甲酯(2)、没食子酸乙酯(3)、莽草酸-3-O-没食子酸酯(4)、3,3'-二甲基鞣花酸(5)、3,3'-二甲氧基鞣花酸-4'-O-α-D-吡喃木糖苷(6)、3-甲氧基-4'-鼠李糖鞣花酸(7)、6-O-没食子酰基熊果苷(8)、龙胆酸5-O-β-D-(6'-O-没食子酰基)-吡喃葡萄糖(9)、4-hydroxy-3-methoxyphenol 1-O-β-D-(6'-O-galloyl)glucoside(10)、1,6-二-O-没食子酰基-β-D-葡萄糖苷(11)、gallic acid 3-O-β-D-(6'-Ogalloyl)-glucopyranoside(12)、benzyl 6-O-galloyl-β-D-glucopyranoside(13)、2,3-di-O-galloyl-D-glucose(14)、gemin D(15)、特里马素(16)、丁香素(17)、viburnolide A(18)。所有化合物均为首次从该植物中分离得到。     

麻疯树皮的化学成分研究

从麻疯树(Jatrophac curcus L.)的树皮中分离得到12个化合物,经理化常数和波谱鉴定(IR,1H NMR,13C NMR,EI-MS)分别为二十六酸甲酯(1),β-谷甾醇(2),蒲公英萜醇(3),蒲公英甾醇(4),伪蒲公英甾醇(5),curcusones A(6),curcusones B(7),jatropholone A(8),jatropholone B(9),3,3′,4-三甲氧基鞣花酸(10),胡萝卜甙(11),蔗糖(12)。其中化合物1,4,5,10,12为首次从该植物中分离得到。     

桂林乌桕中的香豆素和鞣花酸类化合物

从桂林乌桕枝条的乙醇提取物中分离鉴定了8个已知化合物,经波谱分析确定其结构分别为：6,7,8-三甲氧基香豆素(1)、5,6,7,8-四甲氧基香豆素(2)、8-羟基-5,6,7-三甲氧基香豆素(3)、东莨菪内酯(4)、3,3’-二甲氧基鞣花酸(5)、4,4’-二甲氧基鞣花酸(6)、3,3’-二甲氧基鞣花酸-4-Oβ-D-木吡喃苷(7)、3,3’-二甲氧基鞣花酸-4-O-β-D-葡萄吡喃苷(8);其中化合物2,3,6,7,8均为首次从该属植物中分离得到。     

月见草中一个新的莽草酸衍生物CSCD

为了研究月见草Oenothera biennis L.的化学成分,采用硅胶、Sephadex LH-20凝胶、MCI gel CHP-20等柱色谱并结合半制备高效液相等分离技术,利用现代波谱学手段进行化合物结构鉴定。从月见草50%丙酮提取物中分离得到10个化合物,分别鉴定为dimethyl 3-lactyl shikimate(1)、methyl shikimate(2)、3,3′,4-O-三甲基鞣花酸(3)、3,3′-二甲氧基-鞣花酸(4)、3,4,3′-三甲氧基鞣花酸(5)、alternariol 9-methyl ether(6)、2,3-二羟基-1-(4-羟基-3,5-二甲氧基苯基)-1-丙酮(7)、scirpyrone H(8)、dimethoxydimethylphthalide(9)、clearanol C(10)。其中化合物1为新化合物,化合物2~10均为首次从该植物中分离得到。化合物2和3可显著提高TGF-β1诱导BEAS-2B细胞的活力,推测其具有潜在的肺保护作用。     

南山茶果皮化学成分的研究

反复采用硅胶柱色谱法、Sephadex LH-20柱色谱法、ODS柱色谱法、反复重结晶等方法对南山茶果皮的化学成分进行分离纯化,并通过理化常数测定和波谱分析等方法进行结构鉴定。从南山茶果皮中分离并得到了10个化合物,分别鉴定为槲皮素(1)、山奈酚(2)、原儿茶酸(3)、山柰酚-3-O-β-D-葡萄糖基-(6→1)-2′′′,4′′′-O-二乙酰基-α-L-鼠李糖基-(3→1)-2′′′′,3′′′′,4′′′′-O-三乙酰基-α-L-鼠李糖苷(4)、山柰酚-3-O-β-D-葡萄糖基-(6→1)-4′′′-O-乙酰基-α-L-鼠李糖基-(3→1)-3′′′′-O-乙酰基-α-L-鼠李糖苷(5)、3-甲氧基鞣花酸(6)、鞣花酸(7)、羽扇豆烷醇(8)、β-谷甾醇(9)和胡萝卜苷(10)。化合物2、6、7均为首次从南山茶中分离得到,其中化合物6、7为首次从山茶属植物中分离得到。     

红背山麻杆叶的化学成分研究(Ⅳ)—多酚类化合物

红背山麻杆(Alchornea trewioides )为山麻杆属植物,作为传统的中药被用来减轻疾病和身体不适,但它的药效物质基础尚未完全清楚。为了全面掌握红背山麻杆药效物质基础,采用80％丙酮对其新鲜叶进行提取,并利用 MCI gel CHP 20P、Sephadex LH-20等色谱柱进行分离共得到9个化合物。这些化合物的结构经氢谱与碳谱比较分析鉴定为鞣花酸(1)、3-O-甲基没食子酸(2)、decarboxyellagic acid(3)、1-O-没食子酰基-β-D-葡萄糖(4)、1,6-二-O-没食子酰基-β-D-葡萄糖(5)、柯里拉京(6)、叶下珠鞣质 D(7)、furosonin(8)、老鹳草素(9)。其中化合物2~9均为首次从该属植物中分离得到。     

红背山麻杆叶的化学成分研究(Ⅳ)——多酚类化合物（英文）

红背山麻杆(Alchornea trewioides)为山麻杆属植物,作为传统的中药被用来减轻疾病和身体不适,但它的药效物质基础尚未完全清楚。为了全面掌握红背山麻杆药效物质基础,采用80%丙酮对其新鲜叶进行提取,并利用MCI gel CHP 20P、Sephadex LH-20等色谱柱进行分离共得到9个化合物。这些化合物的结构经氢谱与碳谱比较分析鉴定为鞣花酸(1)、3-O-甲基没食子酸(2)、decarboxyellagic acid(3)、1-O-没食子酰基-β-D-葡萄糖(4)、1,6-二-O-没食子酰基-β-D-葡萄糖(5)、柯里拉京(6)、叶下珠鞣质D(7)、furosonin(8)、老鹳草素(9)。其中化合物2~9均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.