990 resultados para Bp


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从沼泽绿牛蛙虹彩病毒(Rana gryliovirus,RGV)基因组中克隆了十四烷基化膜蛋白(myristylated membrane protein,MMP)基因的全部编码区,序列分析表明,RGVmmp基因全长972 bp,编码一个长为323 aa,分子量为35×103的蛋白.氨基酸同源性比对分析,与同为蛙病毒属的其他病毒的相应蛋白同源性都在64%以上.构建重组表达载体,进行了原核表达,获得一条约53×103的融合蛋白,并制备出抗血清.通过RT-PCR和Westernblot分析确定了RGV感染过程

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从蛙虹彩病毒(Rana gryliovirus,RGV)基因组中克隆了含凋亡相关结构域的新基因-cop(Caspaserecruit ment domain only protein,COP)基因的全部编码区,成功构建了重组表达载体,进行了原核表达,并在鲤鱼上皮瘤细胞(Epithelioma papulosumcyprini,EPC)中进行了亚细胞定位.序列分析表明,RGVcop基因全长288 bp,编码一个长为95 aa,分子量为10.4×103的推定蛋白.二级结构预测表明其含有5个α螺旋.同源性比对分

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利用筛选的12条10 bp的随机引物对采自武汉市东湖(3个样点)、南湖(3个样点)、月湖(1个样点)和关桥(1个样点)四个水体的天蓝喇叭虫(Stentor coeruleus)种群进行了随机扩增多态DNA(RAPD)研究,所得清晰条带显示不同样点样本之间存在着一定的变异,其遗传距离在0.076-0.416之间.用Rapdistance 1.04构建聚类图并探讨不同样点之间的遗传距离远近.结果显示南湖的3样点的遗传距离较近,在聚类图上聚成一枝,应该为同一个种群;而东湖的3个样点可能是由于地理隔离原因,在聚类

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通过改进裂解温度和延长裂解时间并增加苯酚/氯仿洗脱次数的DNA提取方法获得南京玄武湖底泥中的DNA,通过PCR法来扩增微囊藻的16SrRNA基因.结果表明在所有采样点中均得到微囊藻基因组DNA,并且纯度较高,OD_(260)/ OD_(280)均高于1.54,最高值达到1.89.PCR的扩增结果显示所有样点的DNA都得到212 bp大小的微囊藻16SrRNA基因片断,表明这种方法可以有效的从底泥中提取微囊藻的DNA,从而为研究底泥微囊藻生理生态及其越冬、上浮、形成水华的机理提供更有利的方法.

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对武汉东湖5个不同湖区的浮游生物群落DNA进行了RAPD指纹分析,并探讨了DNA指纹结构与环境理化因子的关系.结果表明:所筛选的9条随机引物共扩增210条大小为150~2 000 bp的谱带,多态率为93.3%.各站点平均有42条谱带,其中Ⅳ站最多(53条),Ⅴ站最少(35条).Ⅰ站的PO43--P、TP含量最高,Ⅴ站的NH4+-N、TN、NO2--N含量最高,Ⅳ站各理化因子含量均低于其他站点,站点间COD、碱度、硬度、钙含量差异不大.相似性聚类分析表明,基于RAPD标记的浮游生物群落指纹将5个站点划分为

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The ballistic performance of equi-mass plates made from (i) stainless steel (SS); (ii) carbon fibre/epoxy (CF) laminate and (iii) a hybrid plate of both materials has been characterised for a spherical steel projectile. The hybrid plate was orientated with steel on the impact face (SSCF) and on the distal face (CFSS). The penetration velocity (V 50) was highest for the SS plate and lowest for the CF plate. A series of double impact tests were performed, with an initial velocity V I and a subsequent velocity V II at the same impact site. An interaction diagram in (V I,V II) space was constructed to delineate penetration from survival under both impacts. The degree of interaction between the two impact events was greater for the CFSS plate than for the SSCF plate, implying that the distal face has the major effect upon the degree of interaction.

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应用反转录-PCR及RACE技术,从二龄鲤鱼肝组织中克隆了生长激素受体(GHR)的全长基因,其开放阅读框编码602个氨基酸,其中包括244个氨基酸的胞外激素结合结构域,24个氨基酸的跨膜区域和334个氨基酸的胞内信号传导区域.序列分析表明:无论在基因水平还是蛋白质水平,鲤鱼GHR与鲫鱼GHR均具有较高的同源性.用一对基因特异性引物在研究二龄鲤鱼GHR的组织分布时发现:肝与其他组织的扩增产物大小不一致(肝组织中的约小100 bp),测序结果以及基因组PCR表明这是由于一个97 bp的内含子选择性剪切造成的.

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采用RT-PCR方法,从稀有鮈鲫肌肉组织中分离和克隆出β-肌动蛋白基因cDNA部分序列,长度为1 029 bp,编码343个氨基酸残基.序列分析表明,该cDNA序列与其他物种β-肌动蛋白基因同源性非常高.RT-PCR能够检出该基因在稀有鮈鲫肌肉、眼、脑、心脏、肝、肠、鳃、睥、卵巢等组织中广普表达,在胚胎不同发育时期持续恒量表达.并基于已知的鱼类β-肌动蛋白基因序列构建了进化树.

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Rab蛋白家族属于小分子GTP结合蛋白家族Ras超家族中最大的亚家族,主要在囊泡运输中起作用。实验运用PCR、RT-PCR等技术,从八肋游仆虫中克隆到一种新的rab基因。序列分析结果表明:在大核中,该基因全长884 bp,除去两端的端粒与非编码区,该基因在大核中由723 bp组成。从小核中克隆相应的基因片段,此基因片段序列与大核中序列一致,表明该基因在小核中无内部删除序列的存在。通过RT-PCR,从mRNA获得的该基因的开放读框为663 bp,表明该基因在转录过程中有内含子的删除。大核基因序列和cDNA序

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促性腺激素释放激素(GnRH)是一个保守的神经十肽家族,在调节脊椎动物的性腺发育和控制性成熟中起至关重要的作用.用RACE和RT-PCR方法,从鲤鱼脑组织克隆得到两个差异的cGnRH-Ⅱ cDNAs序列,其长度分别为622,578 bp.两个cDNA编码的cGnRH-Ⅱ前体均为86个氨基酸,包括一个信号肽、cGnRH-Ⅱ十肽和一个由蛋白水解位点(Gly-Lys-Arg)连接的GnRH相关肽.内含子捕获和Southern杂交证实鲤鱼基因组中有两个cGnRH-Ⅱ编码基因,且两个基因都可能以单拷贝形式存在.鲤鱼

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The effect of strain rate upon the uniaxial response of Ultra High Molecular-weight Polyethylene (UHMWPE) fibres, yarns and laminates of lay-up [0/90]48 has been measured in both the 0/90 and ±45 configurations. The tensile strength of the matrix-dominated ±45 laminate is two orders of magnitude less than that of the fibre-dominated 0/90 laminate, and is more sensitive to strain rate. A piezoelectric force sensor device was developed to obtain the high strain rate data, and this achieved a rise time of less than 1 μs. It is found that the failure strength (and failure strain) of the yarn is almost insensitive to strain rate within the range (10 -1-103 s-1). At low strain rates (below 10 -1 s-1), creep of the yarn dominates and the failure strain increases with diminishing strain rate. The tensile strength of the dry yarn exceeds that of the laminate by about 20%. Tests on single fibres exceed the strength of the yarn by 20%. © 2013 Elsevier Ltd. All rights reserved.