... 自然选择（Natural selection） 正向选择（positive selection）、 选择约束（selective constraints）、 ...
基于6个网页-相关网页
positive selection method 正相选择法
T cell positive selection T细胞阳性选择
positive selection system 正筛选系统
positive selection targeting sites 正向选择的位点
Positive Selection Algorithm 肯定选择算法
positive selection targeted sites 正向选择作用的位点
Darwinian positive selection sites 达尔文正选择位点
positive-negative selection 正负筛选 ; 正负筛选策略
Positive and Negative Selection 正负选择 ; 正负双向选择法 ; 正负双向筛选系统
Bayesian identification showed one site of the RH1 gene was significantly under positive selection which located in the trans-membranes domain of protein region encoded by RH1 gene.
并且只有RH1基因存在一个正向选择位点,位于该基因编码蛋白的跨膜区域。
参考来源 - 鳅超科鱼类若干基因的进化及分子系统发育分析IntroductionPluripotent lymphocytle stem cells transfer to thymic,gradually from the cortex into the the medulla in thymus. After negative selection and positive selection,T cells have become Progressive differentiation and maturation.
前言多能淋巴干细胞迁移至胸腺,从胸腺的皮质逐渐移行到髓质,经过阳性选择和阴性选择,逐步分化成熟为T细胞。
参考来源 - 胸腺γδT细胞的分化去向By the site-specific model in PAML 4.4,6 amino acid sites undergoing positive selection were detected,5 of them were in the important function regions.
用PAML软件位点-特异模型检测到6个受到正选择作用的位点,其中5个位于功能重要的区域。
参考来源 - 昆虫化学感受蛋白基因的进化分析In addition, this paper proposes a detector maturation algorithm based on T-cell immunity and tolerance by means of simulating maturation mechanism of T cell including positive selection and negative selection.
此外,本文通过模拟T细胞的培育机制,包括阴性选择和阳性选择,提出了基于T细胞免疫耐受的检测器生成算法。
参考来源 - 基于免疫的网络入侵检测模型及算法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
In the first case, strong positive selection for the gene is dissipated by weak selection against hundreds of others.
前一种局面下，自然选择机制对好基因的积极选择，被其余几百个坏基因的逆选择白白浪费掉了。
Much change is due to random genetic drift rather than positive selection. It could be called the survival of the luckiest.
许多变化源于基因的随机变异而非自由选择。我们可以称其为幸运者生存。
That implies that these regions are so important for the organism that their DNA sequences are maintained by positive selection.
这意味着这些区域对于机体如此重要以至于它们的DNA序列通过主动选择来保持。
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