查询词典 recombination

A single machine scheduling problem with batchs setup time depending on sequence is proposed. The math model to minimize setup times is upbuilt. An improved adaptive hybrid genetic algorithm is brought up for solving this scheduling problem. Several operators are redesigned according to the characteristic of this scheduling problem. Follow job optimization recombination crossover is advanced for transmitting the good character to the offspring. To improve the mountain climbing ability of the genetic algorithm, the mutation is replaced by a local optimization algorithm.

提出了一种具有序依赖setup time的单机器批量生产调度问题，以总的setup time最小为目标建立了该生产调度问题的数学模型，设计了一种改进的自适应混合遗传算法求解该生产调度问题，对遗传算法的交叉和变异算子均按照该调度问题的特点进行了改进，提出一种&紧后任务选优重组交叉算子&，该算子能将调度排序上的优良性状很好地遗传到下一代群体中。

Research with bacteria has shown that the smallest unit of recombination or mutation is one base pair, while the size of a unit of function can be determined by the CIS-TRANS TEST.

通过对细菌的研究，结果显示最小的重组突变单位是一个碱基对，而一个功能单位的大小能够由顺反试验决定。

Cis-trans effect The phenomenon resulting from recombination within a gene, in which a mutation is only expressed in the phenotype if the mutant pseudoalleles are on different homologous chromosomes.

顺反效应：如果在同源染色体上假等位基因是不同的，变异仅仅在表现型中表达的基因内重组现象。

Objective To construct recombinant adenovirus by homologous recombination in bacteria .

目的通过细菌内同源重组方法构建重组腺病毒。

An expression construct specified in mammary gland with double cistrons of human G-CSF gene and IRES-EGFP gene under control of ovine beta-lactoglobulin gene flanking sequence,has been constructed in two parts (named fragment I and Fragemnt II)that share an overlapping region of 2.2 kb sequence.Two sites of loxp and lox2272 for homologous recombination were inserted into both flanking regions of G-CSF.The lengths of fragment I and Fragment II are 5.9kb and 5.6 kb,respectively.The whole length of the expression vector (β-LG-hG-CSF-IRES-EGFP) is 9.3 kb.

以绵羊β乳球蛋白基因（β-Lactoglobulin，β-LG）为转基因表达框架，将人G-CSF(Human Granulocyte Colony Stimulating Factor， hG-CSF)基因与报告基因-增强型绿色荧光蛋白(Enhanced Green Fluorescenct Protein， EGFP)基因作为双表达单元拼接到β-LG基因的第一外显子处，并在G-CSF基因两侧引入同源重组位点loxP、lox2272，将打靶基因表达构件β-LG-hG-CSF-IRES-EGFP(总长9.3 kb)分为两段进行构建，片段Ⅰ（长：5.9kb）与片段Ⅱ（长5.6 kb）两段重叠部分为2.2 kb。

Results Insertion of gene and the recombination of adenovirus were identified by restrict enzyme digestions and PCR.

结果经限制性酶切和PCR扩增鉴定，证实为复制缺陷型BMP-2重组腺病毒。

Genetic recombination between homologous DNA duplexes plays a critical role in the maintenance and propagation of genomes.

同源DNA双链之间的遗传重组在基因组的维持和增殖中扮演一个关键角色。

Objective To construct recombination eukaryon expression plasmid for human parathyroid hormone gene, assay PTH expression and biological activity after transfection in vitro and evaluate gene therapy effect on hypoparathyroidsm.

目的构建甲状旁腺激素基因的重组真核表达质粒，评价体外转染后PTH基因的表达与生物学活性，同时观察其对甲状旁腺功能减退动物的基因治疗作用。

It is the first time to study the fluctuation of quantum well width and the influence of exciton localization, arising from the fluctuation, on exciton recombination.

这是首次从理论上探讨了量子阱阱宽涨落及其所引起的激子定域化对激子复合行为的影响。

The analysis of the experimental results shows that the peak Y is due to the radiative recombination of the charged excitons in the ZnCdSe quantum wells.

耦合也导致了载流子在双阱间的非平衡分布，引起的局部电场，导致了荷电激子效应的减弱。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。