up-promoter mutation

Software I DEAS and MARC were used to calculate the thread face contact stress during the make up process, and to analyze the effect of taper mutation of pipe ( pin thread) and coupling ( box thread) on the thread face contact stress quantitatively.

利用I－DEAS和MARC软件计算了拧接过程螺纹齿面的接触应力，定量分析了管体（公螺纹）和管接箍（母螺纹）的锥度变化对齿面接触应力的影响。

Using Line-up Competition Algorithm ( LCA) to optimize the production sequence, simultaneously, a proper mutation strategy was proposed to improve the rate of convergence.

应用列队竞争算法对产品加工排序的组合优化问题进行了求解研究，确定出了较好的变异邻域策略，提高了收敛速率。

Up-Date Development of Molecular Detecting Technology on Gene Mutation and Single Nucleotide Polymorphism

基因突变和单核苷酸多态性分析技术新进展

Those afflicted with SCA also lose the defective blood cells up to 12 times faster than those without the disorder. A mutation in one of the genes responsible for hemoglobin is the root cause of the disorder and it seems to be most prevalent among those whose ancestors lived in areas where malaria was common.

饱受SCA折磨的病人会以常人12倍的速度丢失缺陷血细胞。血红素基因的一处变异是这种疾病的根本原因，而且它似乎在其先人所住的疟疾肆意地区更为盛行。

Objective In order to set up particular mutation mice population of SPF by using purging method.

目的通过净化特种突变小鼠来建立SPF级种子库.