查询词典 mutation

Study on the gene mutation of spinocerebellar ataxia types 1～3 in patients with primary dystonia LI Guibing, WANG Jin.

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Oint mutation of PKCγ gene can induce inherited retinitis pigmentosa,spinocerebellar ataxia and tumors.

KCγ基因点突变可诱发遗传性色素性视网膜炎、脊髓小脑共济失调和肿瘤等。

The mutation of Chinese flowering crabapple of the four seasons is much, because female, staminal valve is changed,spend the person that attach most importance to valve, reason is not strong.

四季海棠的变种多，花为重瓣者由于雌、雄蕊瓣化，故不结实。

This paper introduced an effect capillary zone electrophoresis method for screening of stevia mutation.

本文介绍了一种用毛细管区带电泳法筛选甜菊糖苷突变体的有效方法。

BACKGROUND: In recent years, great advances have been made in human genetics. Many genes responsible for syndromic or non-syndromic hearing loss have been mapped. It was reported that the mutation of PDS gene causes classic Pendred syndrome as well as non-syndromic hearing loss.

背景：近年来，国外在人类基因的研究上突飞猛进，已经找到很多引起症候群或非症候群听障的基因，而已知PDS基因的突变，会引起Pendred症候群或非症候群听障（DFNB4）。

In order to solve the problem of genetic algorithm in local optimum easily,this paper increases a tabu search in a mutation method.

为解决遗传算法易陷入局部最优的问题，提出了一种在变异算子中增加禁忌表的方法。

In order to solve the problem of genetic algorithm easily into local optimal solution, this paper increased a tabu search in a mutation method.

为解决遗传算法易陷入局部最优的问题，提出了一种在变异算子中增加禁忌搜索的方法。

We amied the BCP sequence and the preS2 gene sequence of HBV separately as the target region, according to HBV DNA sequence of Chinese strain, synthesized the set of specific primers, amplified the sequence by PCR method from the serum of patients with CHI, verified by restriction analysis, subcloned into pGEM Teasy vectors, employed polyacrylamide gel electrophoresis to display the deletion mutation and selected the clones with differential length to be sequenced.

本研究应用PCR技术及其他分子生物学技术，分别以HBV转录调控序列BCP以及表面蛋白编码序列pre S2为靶基因，以中国株HBV基因序列为依据，设计特异性多聚酶链反应引物，分别自43例、51例慢性HBV感染患者血清中扩增出目的片段，构建质粒Teasy-BCP和Teasy-pre S2，酶切鉴定后，采用聚丙烯酰胺凝胶电泳技术展示缺失突变，再经DNA测序以了解在慢性乙型肝炎患者体内的病毒变异情况。

An improved self-adaptive genetic algorithm was proposed, for improving terminational criterion and method of selection, making a self-adaptive disposal in crossover and mutation probability.

针对遗传算法在进行多目标优化时，收敛速度慢且易早熟的问题，提出一种改进自适应遗传算法，改进了选择方法和终止判据，并对交叉和变异概率的选取进行了自适应处理。

Three expression vectors containing mutant gfp which were truncated from 3′ termine were constructed in the present paper.The mutation gfp with different length under the control by T 7 promoter were expressed in E. coli BL21 cells.

本文将突变型 gfp3′末端不同程度地截短，构建成表达载体，在大肠杆菌 BL 2 1中表达了不同长度的绿色荧光蛋白，当其生色基因中 65位 Ser点突变成 Thr，则 GFP的激发波由 396nm增至 4 70 nm，不用 UV激发，仅在自然光源下就可看到强烈的绿色荧光，发光强度增加 6倍，若从 3′端截短 12个氨基酸密码，对发光无影响，但截短 75个氨基酸密码，则激发波长降到 360 nm，发光强度减少 12倍。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。