三种革螨的蛋白质,糖蛋白,脂蛋白的比较研究

应用聚丙烯酰胺凝胶盘状电泳(PAGE)对3种革螨的蛋白质、糖蛋白和脂蛋白进行了检测。其中蛋白质尚首次采用SDS-PAGE进行分析。PAGE检测结果显示:格氏血厉螨可见15条蛋白带,4条糖蛋白带,4条脂蛋白带;溜下盾螨呈现15条蛋白带,5条糖蛋白带,5条脂蛋白带;鼠颚毛厉螨出现11条蛋白带,2条糖蛋白带和2条脂蛋白带。SDS-PAGE分析上述3种革螨分别显示出25、23、23条蛋白带。3种革螨的蛋白区带及Rf值均有明显的差别,糖蛋白、脂蛋白的电泳谱带也各异。     

聚丙烯酰胺凝胶电泳脂蛋白带的耐尔氏蓝染色法

目前聚丙烯酰胺凝胶电泳用考马斯亮蓝G或R染蛋白带、用过碘酸-Schiff试剂染糖蛋白带,均取得了满意的结果.至于用油红(OR)、苏丹黑(SB)对琼脂、醋酸纤维膜等凝胶中的脂蛋白带的染色鉴定是成功的,但对聚丙烯酰胺凝胶中的脂蛋白带的染色则不够满意.我们应用耐尔氏蓝[Nile’s blue] 染色法染盘状聚丙烯酰胺凝胶电泳的脂蛋白带取得了较好的结果.现介绍如下:     

一种转移非特异性蛋白带的染色方法

考马斯亮蓝是常用的聚丙烯酰胺凝胶蛋白电泳的染料,利用硝酸纤维素膜(NCF)对染料的吸附作用,将低浓度的考马斯亮蓝(0.025%)染色液直接对NCF上的转移蛋白带进行染色,经实验反复验证.它是一种较好的NCF上转移非特异性蛋白带的染色方法.     

微量聚丙烯酰胺凝胶盘状电泳

聚丙烯酰胺凝胶作为电泳分离的支持物于1959年首次得到应用,而聚丙烯酰胺凝胶盘状电泳则是于1964年发展起来的。同年在分离脑蛋白时,首先应用了微量聚丙烯酰胺凝胶电泳。1965年有人将毛细管用于微量盘状电泳技术并报道了毫微克(ng)蛋白的分离及定量。     

人脑胶质细胞瘤核染色质非组蛋白的聚丙烯酰胺凝胶电泳分析

用不连续SDS-聚丙烯酰胺凝胶电泳分析了人脑胶质细胞瘤与正常脑细胞核NHCP电泳图谱。从二者的NHCP电泳结果表明,脑胶质细胞瘤增加了一条表观分子量为3万的蛋白区带;表观分子量为1.75万～6.5万的蛋白区带染色明显加深。染色质紫外吸收光谱也有明显差异。总之,脑胶质细胞瘤核NHCP发生质与量的变化。     

聚丙烯酰胺凝胶的蛋白质荧光染色法

十二烷基硫酸钠-聚丙烯酰胺凝胶电泳(SDSPAGE),经常用于分离、鉴定蛋白质,测定肽链分子量。蛋白质在聚丙烯酰胺凝胶电泳后,一般用考马斯亮蓝法染色,其优点是操作简易,灵敏度较高。据我们的经验,最低检出量约为每一蛋白带0.5μg。此法的缺点是费时,染色及脱色要一昼夜,且染色后,许多蛋白质丧失抗原性及其它生物学活性。最近我们研究出蛋白质PAGE的荧光染色法,蛋白质样品在上胶前用荧光素标记,电泳后可立即在紫外光灯下看到清晰的蛋白带,其灵敏度不低于考马斯亮蓝法。现介绍如下。一、样品的荧光标记蛋白质样品用牛血清白蛋白(68,000)、卵白蛋白(44,000)、肌红蛋白(16,800)、溶菌酶(14,600)的混     

蝮蛇突触前神经毒素的纯化及其生化性质的进一步研究

本文在前文的基础上,改进了蝮蛇神经毒素的分离方法,纯化了蝮蛇毒中的两个神经毒素之一,突触前神经毒素Agkistrodotoxin(简写为ATX),并对其生化特性进行了分析。应用DEAE-纤维素柱层析、CM-葡聚糖凝胶柱层析和聚丙烯酰胺凝胶垂直板电泳等方法分离纯化,得到一个均一的神经毒素蛋白,经聚丙烯酰胺凝胶在pH 碱性和pH 酸性电泳鉴定,都呈现一条区带。氨基酸定量分析结果表明,此神经毒素由121个氨基酸组成,由此计算出的分子量为13,700,与用SDS-聚丙烯酰胺凝胶电泳测得值接近。N 末端是门冬酰胺,C 末端是丝氨酸。纯化后的神经毒素显示磷脂酶A 活性,比活相当于粗毒的11倍。     

蝮蛇突触前神经毒素的纯化及其生化性质的进一步研究

本文在前文的基础上,改进了蝮蛇神经毒素的分离方法,纯化了蝮蛇毒中的两个神经毒素之一,突触前神经毒素Agkistrodotoxin(简写为ATX),并对其生化特性进行了分析。应用DEAE-纤维素柱层析、CM-葡聚糖凝胶柱层析和聚丙烯酰胺凝胶垂直板电泳等方法分离纯化,得到一个均一的神经毒素蛋白,经聚丙烯酰胺凝胶在pH碱性和pH酸性电泳鉴定,都呈现一条区带。氨基酸定量分析结果表明,此神经毒素由121个氨基酸组成,由此计算出的分子量为13,700,与用SDS-聚丙烯酰胺凝胶电泳测得值接近。N末端是门冬酰胺,C末端是丝氨酸。纯化后的神经毒素显示磷脂酶A活性,比活相当于粗毒的11倍。     

黄鳝性逆转与性腺蛋白关系的分析

实验采用聚丙烯酰胺梯度胶电泳方法，对２６２黄鳝的性腺蛋白进行了分析，结果表明雌性黄鳝随着性腺的成熟性腺蛋白组分有所增多，相反雄性黄鳝随着性原的成熟其性腺蛋白组分则有所减少；；雌鱼性腺Ⅱ－Ⅲ期为１０－１２条区带，雄鱼性腺Ⅲ－Ⅵ期为１３－１０条区带。兼性期性腺蛋白组分明显增加为１５－１９条区带，其增加的蛋白带为一组位于凝胶偏负极端、分子量相近的蛋白分子，性逆转时精巢的组建可能与这组蛋白的调节有关。性逆     

三种分析水稻F1代幼苗生长过程中酯酶同工酶变化的电泳方法比较

利用聚酯胶片作为凝胶支持物的超薄等电聚焦电泳(UTLIEF)研究水稻F1种子萌发过程中的酯酶同工酶多态性变化的结果表明,UTLIEF相比非变性不连续聚丙烯酰胺电泳(native-PAGE)和常规等电聚焦电泳(IEF)得到的酯酶同工酶图谱更清晰,酶带数目和强弱的多态性变化更高,用pH 2～9的两性电解质时等电聚焦的电泳效果较好.     

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.