查询词典 mutation

In this paper, the advances in research of laser mutation breeding mechanism was expounded and the application and achievements in breeding of agriculture, pasturage, farrier and industry microorganism of laser mutation were introduced.

阐述了激光诱变育种机理的研究进展，介绍了激光诱变在农作物、畜牧兽医、工业微生物育种上的应用及取得的成果，并介绍了激光诱变育种的一般操作过程，最后展望了激光诱变育种今后的研究前景。

At the early iteratives, the mutation rate is bigger and the aim is to make particles to explore smaller and isolate region and to avoid the algorithm trapping to the local optimum. While the algorithm runs, the mutation rate will be decreased to reduce the disturbing to the particles. IPSO adopts a new method that congregates some neighboring individuals to form multiple sub-populations in order to lead particles to explore new search space. Additionally, our algorithm incorporates a mechanism with a simple and easy penalty function based on the largest distance between the particle and the boundary of the feasible region to handle constraint.

IPSO采用了一种新型的变异策略，变异概率随着算法的运行是动态变化的：在算法运行初期，变异概率大，其目的是使算法不但能够探测到目标空间中的孤立区域，而且避免搜索陷入局部极值；在算法运行后期，变异概率逐渐变小，以减少对粒子的扰动；算法通过将部分具有邻近距离的粒子聚集成核形成多子群引导种群中粒子的飞行；采用一个简单的基于粒子与可行域边界最远距离的罚函数处理约束的机制，使得算法高效实现。

For the disease to occur, a sperm carrying the mutation (50:50 chance) must fertilise an egg carrying the mutation (50:50 chance).

为疾病的发生，精子进行基因突变（ 50：50机会）必须受精鸡蛋进行突变（ 50：50机会）。

A new RHAG mutation was found firstly in Chinese population,it is a 582 C＞T homozygosity mutation in RHAG gene.

首次在中国人群RhD变异型标本中发现一例新的RHAG等位基因，该等位基因是RHAG外显子第582位C＞T杂合突变。

Results: Tyr486Asp missense mutation in Exon 5 of UGT1A1 gene was found and homozygote of the mutation was confirmed in the proband.

结果：该先证者UGT1A1基因的第5外显子第486密码子发生了T→G碱基的错义突变，导致了酪氨酸变成了天门冬氨酸(Tyr486Asp)。

Objective To investigate the gene mutation in two pedigrees with X-linked ichthyosis and explore the relationship between the mutation and clinical manifestations.

目的 研究X性连锁遗传鱼鳞病家系基因突变，探讨基因突变与临床表现的关系，为进一步开展基因诊断和基因治疗奠定基础。

The key points of DGA is to start evolution with initial population evenly distributed in searching space to avoid the leakiness of subspace, to accelerate the searching process by directed crossover and mutation, to improve holistic survival and adaptive ability by means of competition and parallel evolution in genetic system. However, the crossover and mutation act on different lays in space made the searching uniform.

其基本思路是以空间上均匀分布的初始点展开演化以避免子空间的遗漏，以有方向性的杂交和变异加速和调节搜索，同时杂交和变异作用在不同层面上使搜索在整体上均匀化，通过遗传系统里的并行竞争提高整个群体的生存适应力，从而达到整体优化的目的。

In this paper, we propose an improved evolutionary programming using a mixed strategy based on Gaussion mutation and single-point mutation, which is named SPCEP.

本文提出一种基于经典进化算法和单点变异算法的混合策略进化算法SPCEP。

This mixed strategy has been tested on benchmark functions. The simulation results show that the mixed mutation strategy is superior to any pure mutation strategy.

使用国际通用标准函数来测试这种新算法，仿真的结果表明了基于物种保护的混合变异算子进化策略优于任何一种纯策略的进化策略。

Tracing the development process (i.e. the life history) of vacuum cleaner, we found similarities between product development and evolution trend, such as the theory of "evolve by use and degenerate by no-use" by Lamarck, the theories of mutation, excessive breeding, competition for existence, and survival of the fittest in the Theory of Natural Selection by Darwin and Wallace, as well as the theory of mutation in Neo-Darwinism.

文中经由观察吸尘器诞生后的发展过程，亦即它所经历的生命史中，归纳出它所显现的演变现象有些似乎和演化论有相似之处，例如：Lamarck的用进废退演化现象，Darwin天择说中的变异、过度繁殖、生存竞争、适者生存等，及集合各家说法的Neo-Darwinism中的突变等。

Now she was hungry and angry.She began to smoulder.

现在她又饿又气，她开始流露难以抑制的怒火。

You have placed our iniquities before You, Our secret sins in the light of Your presence.

诗90：8 你将我们的罪孽摆在你面前、将我们的隐恶摆在你面光之中。