药用异喹啉生物碱的研究 Ⅳ.峨眉紫堇生物碱

从峨眉紫堇(Corydalis omeienensis)的根茎中分得十二种生物碱、经UV,IR,[α]_D,CD,~1H-NMR,~(13)C-NMR,MS及物理性质鉴定了它的结构。其中,(-)-tetrahydrocorysamine,为(-)-13-methylprotoberbrine类生物碱,为第二次从植物中获得,至今报导过的该类生物碱从天然得到的也仅此一个。     

牡蒿内生真菌Pestalotiopsis uvicola GMH31固体发酵产物的分离鉴定

采用硅胶柱、凝胶柱等色谱技术及重结晶从牡蒿内生真菌Pestalotiopsis uvicola GMH31的固体发酵产物中分离纯化了10个化学成分,通过化合物波谱数据及理化性质鉴定它们的结构分别为胸腺嘧啶(1)、尿嘧啶(2)、木犀草素(3)、芦丁(4)、槲皮素(5)、香草酸(6)、原儿茶酸(7)、山奈酚(8)、染料木素(9)、柚皮素(10)。其中化合物1~10均为首次从P.uvicola中分离获得,化合物3~5、8~10为黄酮类化合物,化合物8对A2780/Taxol细胞耐药性的逆转作用相对较强。     

琐琐葡萄化学成分研究

采用大孔树脂、聚酰胺和Sephadex LH-20柱从琐琐葡萄乙醇溶液中分离得到六个化合物,通过波谱学技术及理化手段分别鉴定为齐墩果酸(1)、异槲皮苷(2)、槲皮素-3-O-β-D-葡萄糖醛酸钠盐(3)、槲皮素-3-O-β-D-葡萄糖醛酸乙酯苷(4)、没食子酸(5)、单咖啡酰酒石酸(6)。其中化合物2~6为首次从该植物中分离得到,化合物2~4为首次从该属植物中分离得到。     

木竹子枝叶的化学成分及细胞毒和抗炎活性研究

采用硅胶柱色谱和HPLC等分离方法,对木竹子Garcinia multiflora枝叶的化学成分进行分离纯化,依据理化性质及波谱数据分析进行结构鉴定,从中分离鉴定了10个单体化合物,分别为:sampsonione L(1)、hyperibone G(2)、garcicowin C(3)、isogarcinol(4)、garcinialone(5)、clovane-2,9-diol(6)、caryolane-1,9β-diol(7)、异茴芹灵(8),1,2,4-苯三酚(9)和2-羟基-4,6-二甲氧基苯乙酮(10)。化合物1~3和6~10为首次从该植物中分离得到,其中1~2和5~9为首次从该属植物中分离得到。对分离得到的多环多异戊烯基间苯三酚类化合物(1~5)进行了细胞毒和抗炎活性筛选,结果显示化合物3~5具有较好的细胞毒和抗炎活性。     

牡丹花化学成分研究

对毛茛科芍药属植物牡丹的花瓣化学成分进行研究。运用多种色谱方法进行分离纯化,运用~1H NMR、~(13)C NMR和MS波谱学数据鉴定其结构。结果得到7个单萜糖苷类化合物,分别为吡啶芍药苷(1)、paeodanin B(2)、芍药新苷(3)、乙酰芍药苷(4)、芍药苷(5)、苯甲酰芍药苷(6)和氧化芍药苷(7),及2个酚酸类化合物,分别为没食子酸(8)和没食子酸甲酯(9)。化合物1~7均首次从牡丹花中分离得到。     

抱萼獐牙菜的化学成分研究

从抱萼獐牙菜全草中分离到8个成分(Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ、Ⅶ、Ⅷ)。经UV、IR、~1H-NMR、~(13)C-NMR、MS及化学方法鉴定了他们的结构,分别是SwerchirinⅠ)、bellidi-fodin(Ⅱ)、norbellidifodin(Ⅲ)、1,3,7-trihydroxy1-8-methoxyxanthone(Ⅳ),1,3,7,8-tetrahy-droxyxanthone-8-O-β-D-glucopyranoside(Ⅴ)、1,3,7,8-tetrahydroxyxanthone-1-O-β-D-glu-copyranoside(Ⅵ)、swertianolin(Ⅶ)、mangiferin(Ⅷ)。8个成分均为首次从该植物中分得。     

赤芝子实体的化学成分研究(Ⅱ)

采用硅胶及凝胶柱色谱方法从赤芝(Ganoderma lucidum(Leyss.ex Fr.)Karst.)子实体的乙醇提取物中分离得到10个化合物,通过波谱数据及理化性质分别鉴定为赤芝萜醇A(lucidumol A,1)、麦角甾醇(ergosterol,2)、麦角甾醇棕榈酸酯(ergosteryl palmitate,3)、棕榈酸(palmitic acid,4)、β-谷甾醇(β-sitosterol,5)、硬脂酸(stearic acid,6)、油酸(oleic acid,7)、α-羟基-24-烷酸(α-hydroxytetracosanoic acid,8)、2-羟基-二十四烷酸乙酯(2-hydroxytetracosanoic ethyl ester,9)以及2-羟基-二十四烷酸甲酯(2-hydroxytetracosanoic methyl ester,10)。其中,化合物9~10首次从该属植物中分离得到,4~8首次从该植物中分离得到。     

马槟榔果实的化学成分研究（英文）

采用硅胶柱色谱和Sephadex LH-20等分离方法,对马槟榔Capparis masaikai果实的化学成分进行分离纯化,依据理化性质及波谱数据分析进行结构鉴定,从中分离鉴定了10个单体化合物,分别为:杜仲树脂酚(1)、erythro-guaiacylglycerol-β-O-4'-sinapyl ether(2)、hedyotol C(3)、hedyotisol A(4)、hedyotisol B(5)、ozoroalide(6)、5α,6α-epoxy-3β-hydroxyergosta-22-ene-7-one(7)、松柏醛(8)、3-羟基-5-(对羟基苯基)戊酸(9)、β-hydroxypropiovanillone(10)。分离得到的化合物结构类型包括木脂素、大环内酯、甾醇及酚类。化合物1~10为首次从该植物中分离,其中1~7为首次从该属植物中分离得到。     

华贝亭的结构

从家种川产华西贝母(Fritillaria siechuanica)鳞茎中分出一新的甾体生物碱华贝亭(Siechuantine)。其结构由光谱(IR、MS、~1H-、~(13)C-NMR、~1H—~1H Cosy、~(13)C—~1H Cosy和noeds)法推定为1。     

宫颈癌患者外周血CD4+CD25+high调节性T细胞的表达及意义

目的:探讨宫颈癌患者外周血中CD4~ CD25~( high)调节性T(regulator T cells,Tr)的表达及意义。方法:采用流式细胞术检测52例宫颈癌患者,35例健康女性外周血中CD4~ CD25~( high)Tr、细胞毒性T细胞(cytotoxic T lymphocytes,CTL)和NK细胞,采用ELISA检测血清中-干扰素(interferon,IFN-)的表达水平。结果:宫颈癌患者外周血CD4~ CD25~( high)Tr占CD4~ T淋巴细胞的百分比为(7.18±2.32)%,高于健康女性组(P<0.05);宫颈癌患者外周血CD4~ CD25~( high)Tr水平与CTL、NK细胞及IFN-水平呈负相关。结论:宫颈癌患者外周血中具免疫抑制活性的CD4~ CD25~( high)Tr水平较高,参与宫颈癌患者的肿瘤免疫抑制。     

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.