The result demonstrated that the immune selective pressure only had selective function, but not the creating - mutation function in the mutation of virus.
本研究结果显示，抗体这一免疫压力在病毒的变异中可能只起选择性作用，而不起促进变异的作用。
The second mechanism is a more gradual process of adaptive mutation, whereby the capability of the virus to bind to human cells increases during subsequent infections of humans.
第二种机制是一个渐进的适应性变异过程，在这一过程中，伴随人类受到感染，病毒与人体细胞相结合的能力增加了。
To date, no links between the small number of patients infected with the mutated virus have been found and the mutation does not appear to spread.
迄今为止，尚未发现少数感染变异病毒的患者之间有任何联系，变异病毒似未传播开来。
At present, the researchers continue the effort on creation of efficiently operating structures, including the ones that are able to overcome high virus mutation.
目前，研究者们继续专注于设计有效的人工片断，包括能够抑制病毒高度变异性的片断。
But we did not see this mutation in the NA of the1918 virus either.
不过，在1918年的病毒中，我们也没有发现这种突变。
The other mutation with a significant effect on virulence has been seen in the NA gene of two influenza virus strains that infect mice.
另一种对病毒毒性具有重要影响的突变，存在两种感染小鼠的流感病毒株的NA基因上。
The establishment of AIV animal models may provide a tool for the study on the infection, mutation of avian influenza virus and pathogenesis of the disease.
禽流感病毒动物模型的建立可以为研究病毒的突变、传染性和发病机制提供良好的技术平台。
Objective To generate rescued viruses with deletion mutation of capsid protein from dengue virus type 2 isolated in China (DEN2-43).
目的制备登革2型病毒中国分离株(DEN2 - 43)的衣壳蛋白缺失突变病毒。
That may be a common physiological mechanism which means organism can control the expression of genes and resist the virus infection, or the DNA mutation induced by during the period of evolution.
在进化上，这可能是生物调控基因表达及抵御病毒侵染或转座子诱导DNA突变的一种共有的生理机制。
Objective: To investigate the frequency of transfusion-transmitted virus(TTV) infection in healthy blood donors in Hangzhou area and the mutation of TTV genomic fragment.
目的：了解杭州地区健康献血员中输血传播病毒（TTV）的感染情况和病毒基因组片段的变异性。
These two new antibody discovery is important because the HIV virus is prone to mutation, and two new antibodies appear to resist any form of HIV.
这两种新抗体的发现之所以重要，是因为HIV病毒很容易发生变异，而这两种新抗体可以抵御以任何形态出现的HIV病毒。
Dynamic gene mutation and the reassortment of genes have been considered as the key factors responsible for influenza a virus virulence and host tropism change.
动态的基因突变和基因重组被认为是流感病毒A的致病性和宿主趋向性改变的关键因子。
Objectives to construct the cloning vector of glycoprotein E1 gene of rubella virus, to study the mutation of glycoprotein E1 gene, and to analyze the sequence of E1 gene by the phylogenetic tree.
目的建立风疹病毒包膜糖蛋白e1的克隆载体；研究e1基因变异情况，并对其序列进行系统发生树分析。
Objectives to construct the cloning vector of glycoprotein E1 gene of rubella virus, to study the mutation of glycoprotein E1 gene, and to analyze the sequence of E1 gene by the phylogenetic tree.
目的建立风疹病毒包膜糖蛋白e1的克隆载体；研究e1基因变异情况，并对其序列进行系统发生树分析。
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