益母草抗结核分枝杆菌成分的跟踪分离北大核心CSCD

结核病分为肺结核和肺外结核,其中子宫结核属于肺外结核,是造成不孕的主要原因。益母草是我国传统中药,常用于妇科疾病的治疗。在筛选中发现,益母草乙醇提取物具有抗结核分枝杆菌活性,经活性跟踪分离,从益母草乙酸乙酯萃取部位中分离得到具有抑制结核分枝杆菌的单体化合物1,鉴定为益母草碱,抗结核杆菌的MIC值为80μg/m L。这一发现为治疗子宫结核提供了新的线索。     

基于网络药理学的益母草治疗产后腹痛的潜在分子机制研究

本文通过网络药理学方法探讨益母草治疗产后腹痛的潜在分子机制。首先根据TCMSP数据库和文献挖掘益母草的活性成分,在TCMSP、Swiss Target Prediction、Similarity ensemble approach平台上检索活性成分靶点,在OMIM、GeneCards上检索产后腹痛靶点,得到益母草-产后腹痛交集靶点。利用STRING数据库构建蛋白互作(PPI)网络,接着利用Cytoscape软件对PPI网络进行拓扑分析,并对拓扑分析筛选出的核心靶点进行基因本体论(Gene Ontology,GO)分析和京都基因与基因组百科全书(Kyoto Encyclopedia of Genes and Genomes,KEGG)通路分析。最后利用免疫组化实验验证益母草对流产大鼠模型子宫组织中PGF2αR、MMP9、TIMP1、VEGFA、VEGFR2蛋白表达水平的影响。最终得到益母草活性成分10种,与产后腹痛相关靶点144个;通过PPI网络分析筛选出118个靶点,进一步拓扑分析后得到98个节点;然后对这98个节点进行GO和KEGG注释。GO分析得到1151个生物过程(BP)条目,97个细胞组成(CC)条目,122个分子功能(MF)条目;KEGG分析得到41条通路,主要涉及雌激素、PI3K-Akt、MAPK、HIF-1信号通路等。最后免疫组化实验证明益母草可显著抑制流产模型大鼠子宫组织中PGF2αR、MMP9蛋白上调和TIMP1、VEGFR2蛋白下调。本研究通过网络药理学和免疫组化实验验证,显示益母草治疗产后腹痛是多成分、多靶点、多途径相互作用的结果,为益母草的临床应用提供了一定的理论依据。     

益母草属化学成分研究进展

对益母草属植物近20年化学成分研究作了综述,主要成分是生物碱、二萜、苷类。     

益母草的核型研究

<正> 益母草Leonurus japonicus Houtt, (L. heterophyllus Sweet, L. artemisia(Lour,) S. Y. Hu)是唇形科益母单属的一、二年生草本植物,全国各地均产,朝鲜和日本也有分布,生于旷野向阳处,海拔可达3400米。 益母草是著名的重要中药,《神农本草经》和明李时珍的《本草纲目》列为上品,性微寒,味辛苦,具有活血调经、祛瘀生新之功效,为妇科要药,果实名“茺蔚子”,能清肝明目。     

白花益母草种子的化学成分分析

对白花益母草种子的化学成分进行分析,结果表明,种子油含有大量人体必需的不饱和脂肪酸,其主要成分为：亚油酸（42．60％）、亚麻酸（30．22％）、油酸（20．28％）等,此外种子还含有18种氨基酸和24种矿质元素和蛋白质等成分。其种子和种子油具有较高的营养价值和药用功效。     

贮藏条件对益母草、桔梗和白术种子发芽率的影响(简报)

益母草、桔梗和白术3种药用植物种子均不耐贮藏,在收到种子后初始发芽率较低.益母草与桔梗种子萌发适温是25±1℃,而白术种子为15±1℃.在适温下,益母草、桔梗与白术种子的发芽率分别是69.8%、39.8%和46.8%.在15%RH下(硅胶密闭),种子贮藏较适宜,43%RH下贮藏种子的发芽率次之.益母草种子宜在15℃中贮藏,桔梗种子则宜在5℃中贮藏,在5℃下75%RH和43%RH贮藏后的发芽率相近.用PEG6000引发处理桔梗种子可以明显地提高发芽率,但益母草种子则出现负效应.     

不仅是"益母"草:益母草的心脏保护作用

益母草作为一种传统的妇科中药,近年来的研究表明其作用是多方面的。在心血管方面,益母草能改善心肌缺血、增加冠状动脉血流、提高心功能,其机制主要是在氧化应激状态下通过清除氧自由基、抑制活性氧簇生成发挥抗氧化作用。益母草心脏保护作用的另一机制是促进血管发生。临床试验也表明,益母草能抑制冠心病人的血小板聚集,起抗凝、抗血栓形成作用,从而改善血流变学参数。本文根据目前研究进展,对益母草的心脏保护作用简要综述。     

益母草不同组分的抑螺效果及对钉螺酯酶同工酶的影响

通过水浸液灭螺实验,对益母草的根、茎、叶水浸液及益母草水苏碱水溶液的杀灭钉螺作用进行了初步研究.结果表明:各处理均有较好的灭螺效果,但毒效较氯硝柳胺略慢,益母草各部分灭螺效果的顺序为叶＞茎＞根;采用同工酶电泳技术检测了益母草水浸液处理钉螺时对钉螺酯酶同工酶的影响,处理1～2 d后样品的酶活高于对照组,处理3～4 d后的酶活则大大减弱,在这一过程中,有时出现新的酶带,有时又有酶带消失,酶带的变化主要在正极区,与正常的病理反应完全一致.     

不同施肥水平对益母草生长的影响

对益母草〔Ｌｅｏｎｕｒｕｓａｒｔｅｍｉｓｉａ（Ｌｏｕｒ．）Ｓ．Ｙ．Ｈｕ〕作不同肥料水平的田间处理,考评单株鲜重、地上部分鲜重、分蘖数和长叶速度等生物学特性。Ｌ４（２３）试验结果表明：（１）磷肥对益母草的单株鲜重、地上部分鲜重和分蘖数的影响起主导作用,氮肥次之,钾肥影响最弱;（２）对益母草的长叶速度,磷肥起决定性作用,氮肥、钾肥的影响不明显;（３）氮肥能促进叶片中叶绿素的积累。根据这些结果对益母草的需肥特性进行了讨论。     

9种益母草属植物的花粉粒形态

利用光学显微镜、扫描电镜对国产８种１变种及欧美产１种益母草属植物的花粉粒进行观察与研究。本属植物花粉粒椭 球形或近球形,益母草和白花益母草花粉粒两端突起成喙。具３沟,狭长,几达两极,人内陷或内陷。外壁纹纹饰网状,某些种尚具或为细小的穿孔。结果基本支持各种的系统地位。     

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.