查询词典 mutation

In this paper, an efficient and easy biological screening method based on the sensitivity to lovastatin of Neurospora crassa was built to deal with the mutant strain rudely by UV mutation. A high-level strain was screened in the shaking flask culture incorporating with TLC and HPLC. A comparison between this two methods also was originally discussed while identifying dyeing using bromophenol blue as the better treatment of TLC, and offering a kind of simple, practical, fast and economical determination qualitatively and quantitatively.

本文有鉴于此，通过紫外诱变处理，并基于粗糙脉孢酶对洛伐他汀的生物敏感性，对诱变菌株进行了初筛；同时，采用摇瓶培养，结合TLC和HPLC的分析方法，复筛出一株高产菌株；对复筛过程两种分析方法分别进行了初步探讨，比较其优劣，确定TLC法经溴酚兰显色剂显色处理为较佳方式；从而，建立了一套简单、实用、快速、经济且有效的洛伐他汀生产菌诱变筛选方法。

The calli treated with 0.3% EMS is an induced mutation which has the expected characters.

EMS处理的愈伤组织发生了变异，变异种是所期望的比较理想的细胞系。

The mutation of K-ras gene and the abnormal transcription of FHIT gene have close correlatetion with tumorigenic development of lung cancer.K-ras and FH1T became the molecule target of smoke cancerigenic.

K-ras、FHIT基因异常与肺癌发生密切相关。

Methods Human nasopharyngeal carcinoma ceil line CNE-1 with p53 mutation, was used in this study.

应用流式细胞仪和凋亡试剂盒测定不同条件下CNE-1细胞的凋亡比例。

According to evolutionists, random mutation is purportedly what brought life from the one celled stage to its present complexity.

据evolutionists，据称是随机突变带来什么从一个细胞生命阶段，到现在的复杂性。

OBJECTIVE To study the effect of centrosome on mutation and development of gene of laryngeal carcinoma by investigating centrosome expression and metaphase morphology in laryngeal squamous cell carcinoma cell lines.

目的通过对喉鳞状细胞癌细胞系中心体表达和细胞分裂形态的研究，探讨中心体通过对细胞分裂过程的调控，在促进喉癌基因不断变异、发展机制过程中的作用。

Traditional natural isolation, mutation and selection, rational screening and protoplast fusion have made a great progress in the improvement of both Penicillium chrysogenum and Cephalosporium acremonium, two main industrial strains for production of P-lactam antibiotics.

在增加产量和大幅度地降低生产成本方面，最主要的β-内酰胺抗生素生产菌，产黄青霉和顶头孢霉(Acremonium chrysogenum or Cephalosporium acremonium)的菌种改良和发酵工艺的优化得到卓有成效的发展。

Embedding the gradient direction search and new kinds of evaluation functions into the Genetic Algorithm, a special hybrid Genetic Algorithm with mutation along the weighted gradient direction to solve non-linear programming problems is developed. Then in Chapt 4, a type of nonlinear programming problems with fuzzy objective and fuzzy resources constraints is discussed, in which the objective is ill-defined and the resources possess two different types of fuzzy resources, i. e., tolerance and imprecision. By way of description and formulation of fuzzy objective and fuzzy resources, the problem with fuzzy objective and two different types of fuzzy resources is modelled into a fuzzy nonlinear programming model FO/RNLP and interpreted as three equivalent alternative crisp model to reflect the variety of the environment and the subjective and preference of the decision maker .

本文首先针对遗传算法在求解非线性规划问题中存在的问题，首次提出非可行点／染色体的主导准可行方向，准可行方向，及非可行点属于可行域的可行度等新概念，借助于模糊思想，提出了描述和度量非可行染色体的新方法；通过嵌入非可行染色体的信息于评价函数中，提出了三种新的评价非可行染色体的评价函数；把传统的启发式方法-梯度方向搜索和新的评价函数嵌入到遗传算法中，提出了一种沿加权梯度方向变异的新型混合式遗传算法；第四章针对生产实际中非清晰定义的模糊目标和两种类型的模糊资源，建立了一类连续型模糊目标／资源约束非线性规划问题的模型FO／RNLP。

Study the acute tocicity and three items of resulting in mutation for the indectable collagenous in mice are studied.

研究可注射性胶原生物材料的急性毒性和三项致突变性作用。

In order to preserve the varieties of the swarm and avoid to be in premature convergence,a Particle Swarm Optimization algorithm based on the differential evolution mutation is proposed.The new algorithm uses the particle aggregation quality to judge that if the particles in the swarm are congregative so much,then apply the differential evolution to mutate the self prevenient best position of each particle,in order to realize the aim of preserving the varieties of the swarm.

为了保持粒子种群的多样性而避免发生&早熟&的问题，提出一种基于差异演化变异的粒子群优化算法，该方法通过粒子聚集性判断如果粒子群中的粒子过于聚集，则使用差异演化算法对PSO算法中各个粒子的自身历史最佳位置进行变异，以实现保持粒子群种群多样性的目的。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。