结香化学成分的研究

从结香(Edgeworthia chrysantha)的花蕾中分离得出3个香豆索,2个黄酮。用波谱等方法确定其结构为伞形花内酯(umbelliferone,1),6-甲氧基-7-羟基双香豆素-3,7’-醚(daphnoretin,2),7,7’-二羟基双香豆素-8,8’-醚-7-α-L-鼠李糖甙(edgeworoside c,5),4’,5,7-三羟基黄酮醇-3-O-β-D-(6′′-对羟基桂皮酰基)-葡萄糖甙(tiliroside,3),山萘酚-3-O-β-D-葡萄糖甙(kaempferol-3-O-β-D-glucoside,4),以上化合物均为首次从结香花蕾中得到。     

卷柏化学成分及细胞毒活性研究(英文)

从卷柏(Selaginella tamariscina(Beauv.)Spring)中分离得到10个化合物,运用波谱手段分别鉴定为se-laginellin(1)、selaginellin A(2)、selaginellin B(3)、穗花杉双黄酮(4)、sequoiaflavone(5)、去甲银杏双黄酮(6)、银杏双黄酮(7)、异银杏双黄酮(8)、扁柏双黄酮(9)、异柳杉双黄酮(10)。其中化合物1、5和8为首次从该植物中分离得到。化合物1,4,7,8和9显示出选择性的细胞毒活性。     

满山香种子中化学成分研究

为研究满山香种子的化学成分,采用满山香种子经75%乙醇提取、溶剂萃取、硅胶柱层析、SephadexLH-20柱层析和硅胶制备薄层层析等方法,分离得5个单体化合物,分别鉴定为:杨梅素(myricetin,Ⅰ)、对苯二酚(1,4-dihydroxybenzene,Ⅱ)、香草酸(vanillicacid,Ⅲ)、β-胡萝卜苷(dauosterol,Ⅳ)和银杏双黄酮(ginkge-tin,Ⅴ)。以上化合物均为首次从该植物中分得。     

深绿卷柏的一个新双黄酮

从云南产中药深绿卷柏 (Selaginelladoederleinii)中分离得到一个新的双黄酮类化合物 ,通过波谱分析和文献数据比较 ,确定其结构为具有 3′～ 6″连接的 4′ -甲氧基罗伯斯特黄酮。     

垫状卷柏中化学成分的分离及其抑制肿瘤细胞增殖活性CSCD

利用质谱引导的自动纯化分离系统对垫状卷柏95%乙醇提取物的乙酸乙酯萃取部分进行选择性分离纯化双黄酮类、炔酚类化合物。并利用MS、^(1)H NMR、^(13)C NMR、2D NMR等光波谱分析方法确定结构,结果得到四个双黄酮类化合物,分别为扁柏双黄酮(1)、异柳杉双黄酮(2)、苏铁双黄酮(3)、穗花杉双黄酮(4),七个炔酚类化合物,分别为selaginellin(5)、selaginpulvilin A(6)、selaginpulvilin B(7)、selaginellin O(8)、selaginellin E(9)、selaginellin A(10)、selaginellin B(11)。采用MTT法评价了化合物1~11体外抑制人非小细胞肺癌细胞(NSCLC)H322增殖活性,结果表明,除化合物4和7外,其他化合物对人非小细胞肺癌细胞H322有不同程度的增殖抑制活性,其中化合物3和10抑制作用较强,IC_(50)值分别为16.70和9.54μmol/L。     

秀雅杜鹃化学成分的研究

从秀雅杜鹃全草的石油醚部分和乙酸乙酯部分中分离出20个化合物,利用现代波谱技术(MS1、HNMR、13CNMR、DEPT、CD)和化学方法对其中17个化合物进行了结构鉴定,分别为2S-4′,5,7-三羟基黄烷酮(1)、(2R,3R)-( )花旗松素(2)、扁蓄苷(3)、槲皮素-3-O--αL-鼠李糖苷(4)、金丝桃苷(5)、槲皮素(6)、16,17-二羟基,11β-贝壳杉烷-19酸(7)、异莨菪亭(8)、喇叭茶醇(9)、豆甾-4-烯-6β-醇-3-酮(10)、β-香树脂醇(11)、α-香树脂醇(12)、28-羟基-β-香树脂醇(13)、山楂醇(14)、齐墩果酸(15)、β-谷甾醇(16)、β-胡萝卜苷(17).所有化合物均为首次从该植物中分得,其中化合物1、7、8、9、10为首次从该属植物中发现.     

HPLC法测定卷柏及其炮制品中穗花杉双黄酮的含量

采用HPLC方法测定卷柏及炮制品中穗花杉双黄酮的含量。方法:Shim-pack VP-ODS柱(4.6 mm×250mm,5μm);流动相:甲醇-0.1%磷酸水(65∶35);流速:0.8 mL/min;检测波长:337 nm;柱温:25℃。实验结果表明,卷柏生品中穗花杉双黄酮的含量为0.84%,焦卷柏为1.07%,卷柏炭为0.53%。不同的炮制方法对穗花杉双黄酮的含量产生不同的影响。     

RP-HPLC法测定垫状卷柏中穗花杉双黄酮的含量

本文用反相高效液相色谱法测定垫状卷柏药材中的穗花杉双黄酮.选用Puraspher star RP-C18色谱柱(250 mm×4.6 mm,5μm),以甲醇-0.1%磷酸水溶液(65:35)为流动相,流速为0.8 mL/min,检测波长337 nm,柱温25℃进行检测.结果显示,穗花杉双黄酮的含量在0.038～0.342 μg范围内时进样量与峰面积积分值呈良好的线性关系,r=0.9999,平均回收率为101.2%,RSD为2.3%(n=6).该方法测定垫状卷柏药材中的穗花杉双黄酮含量灵敏、准确、重现性好.     

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.