牛Ⅲ型前胶原的提取及抗血清的制备

 在中性pH和蛋白酶抑制剂的存在下,从新生小牛皮肤中提取Ⅲ型前胶原。利用反复盐析法将Ⅰ型胶原和前胶原与Ⅲ型胶原和前胶原分开,再经DEAE纤维素层析分离出Ⅲ型前胶原。 用提取的Ⅲ型前胶原免疫家兔,获得抗血清,用酶联免疫法测定效价达1:10O,000。经与国外标准品鉴定该提取物为Ⅲ型前胶原。     

海蜇胶原蛋白的提取及纯化(英文)

通过胃蛋白酶的限制性酶切、选择性盐析及阳离子交换柱的层析作用,低温从海蜇中胶层提取可得到胃蛋白酶促溶且去除端肽(telopeptide)的胶原蛋白(PSC)。紫外-可见扫描测得PSC的最大吸收峰位于235nm。凝胶电泳及氨基酸分析显示这些都符合Ⅰ型胶原的特征,同水母S.nomurai和Rhopilema asamushi来源的胶原蛋白基本一致,作为一个低等动物,其氨基酸分析显示了脊椎动物和非脊椎动物的微小差异。     

法乐氏四联症右室流出道心肌间质胶原表达改变

摘要：探讨法乐氏四联症患者右室流出道I、Ⅲ型胶原蛋白mRNA与蛋白质合成的表达改变,以期进一步阐明法乐氏四联症的发病机制．用RT—PCR方法检测32例法乐氏四联症患者与同期17例小室缺患者右室流出道Ⅰ、Ⅲ型胶原mRNA的表达差异,并分析了不同氧饱和度对法乐氏四联症胶原蛋白mRNA表达的影响．同时应用免疫组化图像分析及Western blot检测右室流出道Ⅰ、Ⅲ型胶原蛋白含量并作对比分析．研究发现法乐氏四联症患者右室流出道Ⅰ、Ⅲ型胶原蛋白mRNA与蛋白质合成均较对照组增高并且出现胶原比值改变,缺氧程度与胶原合成关系密切．     

肺动脉管壁Ⅰ.Ⅲ型胶原变化在慢性低O2高CO2肺动脉高 …

目的：探讨管壁胶原及Ⅰ、Ⅲ型胶原变化在慢性低Ｏ２高ＣＯ２性肺动脉高压形成中的作用。方法：采用透射电镜、图像分析及免疫组化等方法,研究四周低Ｏ２高ＣＯ２对大鼠肺动脉压力和管壁胶原及Ⅰ、Ⅲ型胶原的影响,肺动脉壁Ⅰ和Ⅲ型胶原的平均积分吸光度值作为Ⅰ、Ⅲ型胶原的相对含量。结果：①低Ｏ２高ＣＯ２组（Ｂ组）大鼠肺动脉平均压９ＭＰＡＰ）显著高于对照组（Ｐ〈０．０１）,颈动脉平均压（ＭＣＡＰ）无明显变化（Ｐ〉０．     

Tb(Ⅲ)与Ⅱ型胶原的相互作用

提取并分离纯化了Ⅱ型胶原,研究了Ｔｂ（Ⅲ）与Ⅱ型胶原的相互作用,结果表明Ⅱ型胶原对Ｔｂ（Ⅲ）有配位作用,并能极大地增强其荧光强度．用荧光滴定法和Ｓｃａｔｃｈａｒｄ作图法确定了Ⅱ型胶原与Ｔｂ（Ⅲ）的结合常数和结合部位数,结果表明Ⅱ型胶原与Ｔｂ（Ⅲ）有两类结合部位．其结合部位数和结合常数分别为０．７;３．１×１０５和１．３;１．０×１０５．     

人胎盘中Ⅰ、Ⅲ、Ⅳ型胶原的提取

胶原蛋白是重要的细胞外基质成分,约占人体蛋白总量的1/3,目前已确定的胶原至少有12种类型,各型胶原都具有一定的分子构型、基因定位及组织分布特点。胶原的提取与纯化是进行胶原免疫组织化学研究的必要步骤。本文参照国外有关文献并作适当改进,成功地从人胎盘中提取了Ⅰ、Ⅲ、Ⅳ型胶原蛋白。     

MMP-2与Ⅰ型胶原关系的研究进展

MMP-2与I型胶原分别为基质金属蛋白酶家族的重要成员和细胞外基质的主要成分,近年来研究发现,MMP-2与Ⅰ型胶原的表达与调控在多种与胶原代谢有关的疾病中起着重要作用。通过增强或抑制MMP-2来调控I型胶原,进而防止疾病的发生发展已成为很多疾病的研究热点。对MMP-2与Ⅰ型胶原关系更新的认识也引起了越来越多的关注,必然带动对MMP-2与Ⅰ型胶原更深层次的研究,本文就近年来有关MMP-2与Ⅰ型胶原的研究进展做一综述,为多种胶原代谢疾病发病机理与防治的探究提供新的思路和理论依据。     

人Ⅳ型胶原的提纯及其抗血清制备

采用胃蛋白酶限制性消化,NaCl分级盐析,还原和烷基化反应,纤维素离子交换层析从人胎盘组织分离纯化Ⅳ型胶原.经SDS-PAGE电泳鉴定符合Ⅳ型胶原α肽链电泳带.用纯化的Ⅳ型胶原免疫兔制备出高效价的特异抗血清.     

Tb（Ⅲ）与Ⅱ型胶原的相互作用

提取并分离纯化了Ⅱ型胶原,研究了Ｔｂ（Ⅲ）与Ⅱ型胶原的相互作用,结果表明Ⅱ型胶原对Ｔｂ（Ⅲ）有配位作用,并能极大地增强其荧光强度。用荧光滴定法和Ｓｃａｔｃｈａｒｄ作图法确定了Ⅱ型胶原与Ｔｂ（Ⅲ）的结合常数和结合部位数,结果表明Ⅱ型胶原与Ｔｂ（Ⅲ）有两类结合部位,其结合部位数和结合常数分别为０．７;３．１×１０＾５和１．３;１．０×１０＾５。     

羊Ⅲ型前胶原的分离纯化

目的：从山羊胎皮提纯羊Ⅲ型前胶原,以代替人Ⅲ型前胶原生产免疫试剂。方法;以山羊胎皮为原料,通过11．2％硫酸铵及10％氯化钠盐析和超速离心,DE32和DE52阴离子交换纤维素柱层析提取纯化得到羊Ⅲ型前胶原。结果：测得羊Ⅲ型前胶原分子量为468kDa。主要成分甘氨酸,羟脯氨酸和脯氨酸构成比分别为40．4％,11．7％和11．1％。与人羊Ⅲ型前胶原的交叉反应为65．89％。结论：提纯得到的羊Ⅲ型前胶原可以用于代替人Ⅲ型前胶原生产免疫检测试剂。     

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.