查询词典 vectors

The transgenic tobacco plants could delay TMV infection for about 25 days compared with non-transgenic tobacco plants.Pokeweed antiviral protein II is expressed with high level in summer leaves. The expression of PAPII is regulated by season. The total RNA was extracted from pokeweed (Phytolacca americana L.) leaves in summer using the method of TRIzol and used as template to amplify the PAPII gene by RT-PCR and then the gene was cloned into E.coli expression vector and secreted expression pPIC9K vector. The two vectors with PAPII gene were then transferred into E.coli strain BL21 (DE3)-plysS and Pachia pastor is GS115 strain respectively. The specific protein was produced induced by IPTG and methanol.

由于美洲商陆抗病毒蛋白Ⅱ是一个受季节调控表达的蛋白，本实验以美洲商陆夏季叶片为材料，通过对其总RNA的提取、反转录、并用PAPⅡ的特异引物进行PCR扩增，对PAPⅡ进行了基因克隆、序列分析，结果扩增出来的PAPⅡ基因与已经报道的序列同源性是99.9％，然后将该基因构建到原核、真核表达载体上，分别转化了大肠杆菌和毕赤酵母并对它们进行了诱导表达，在两个表达系统中均获得了有活性的PAPⅡ表达蛋白，体外生物测定表明表达的蛋白均具有抑制病毒的活性，PAPⅡ基因在酵母中还没有表达的报道，这为获得具活性PAPⅡ蛋白提供了一种简便可行的方法。

The angular extent in a specified plane which contains all the radius vectors of the polar curve of luminous intensity having lengths greater than a specified fraction of the maximum.

在某一平面上，一定角宽范围内所包含的光强极轴曲线上的矢径长度均大于其最大值的某一特定比例，这种情况定义为光束的发散。

It is based on a polynomial model,which can describe the change tendency of motion vectors within a small area.

1引言H.264是联合视频专家组提出的一种全新的视频压缩标准，它采用了许多与以往标准不同的编码特性。

DE gets each generation of population using the real value parameter vector, and the crucial idea of DE is a scheme for generating trial parameter vectors.

DE利用实数值参数向量作为每一代的种群，它的自参考种群繁殖方案与其他优化算法不同。

The existence is affirmed if and only if all principal minor of the matrix composed by the vectors is positive.

本文求得了答案，命题成立的充要条件是由向量组构成的矩阵的每一个主子式为正。

By the statistical analysis of motion vector probability distribution of sequences, its directional characteristics are found. A novel algorithm-improved cross-diamond search algorithm is proposed by using small cross-search pattern to search small fiction vectors as the initial step based on the center-biased characteristics of motion vector probability distribution.

通过对序列运动矢量概率分布分析，发现了该概率分布的方向性特性，提出了一种新的块匹配运动估计算法―改进的十字－菱形搜索算法。

The probability vector can be viewed as a prototype vector for generating solution vectors that have high evaluations with respect to the available knowledge of the search space. Compared with the general genetic algorithm, PBIL discards the complex and problem-correlation operators, which always affect the algorithm's performance highly.

相对于常规遗传算法，PBIL进化算法抛弃了复杂的且对算法性能影响很大的交叉、变异算子，而引入竞争学习的机制，以概率矢量的方式通过采样来产生下一代群体，然后选出群体中最优个体对概率矢量进行更新，直至最后收敛。

A fast and real-time algorithm to obtain some vectors of the projection matrix is proposed in this dissertation to solve the conflict of time cost by matrix obtainment and memory occupied by matrix, and speed the iterative algorithm.

作者根据扇形扫描几何的对称性和重叠性，提出了一种快速实时获取投影矩阵分量的方法，较好地解决了获取投影矩阵所需速度和存放其所占内存空间的矛盾，提高了迭代重建算法的速度。

We found a proper expression vector by simulating protein structure. We simulated its proper conformation in two vectors pGEX-6P-1 and pET44b by homology modeling.

本研究探讨了将蛋白结构模拟用于寻找合适的表达载体的方式：通过同源建模，模拟了5-helix在pGEX-6P-1载体及pET44b载体上的融合蛋白形成的最有可能的2种构象。

Methods : Using GV1 and GV2 targetable non-viral vectors, the influences of the poly-L-lysine and protamine on in vitro gene transfer efficiency and the course of gene expression were observed.

利用GV1，GV2靶向性非病毒载体来比较多聚赖氨酸与鱼精蛋白对靶向性基因转移复合体携带DNA的能力及体外基因转移效率的影响。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。