正选择

DNA水平上检测正选择方法的研究进展

Advances in detecting positive selection on genome

用两种方法计算了GAGE各拷贝间的Ka/Ks值，结果为显著大于1，表明该基因家族受到正选择作用。

The Ka / Ks value of the duplicates was significantly greater than 1 , indicating that GAGE family is under positive selection .

在Google内部也有几个团队正选择Go来构建软件产品，我们也收到其他公司正在用Go开发大系统的报导。

Internally at Google there are several teams that choose Go for building production software , and we have received reports from other companies that are developing sizable systems in Go .

“因为我们学院和大学的卓越性和多样性，在世界范围内有更多学生正选择在美国学习，”助理国务卿（R）安？斯托克说。

" Because of the excellence and diversity of our colleges and universities , more students worldwide are choosing to study in the United States ," said Ann Stock , Assistant Secretary of State ( R ) .

适应性进化分析没有检测到正选择位点，表明Annexina4非常保守，受到强烈的功能约束。

It has not been detected any positive selection sites by adaptive evolutional analysis , therefore Annexin A4 are highly conserved and undergoing strong functional constraint .

许多逃北者（escapee）打算到韩国定居，但更多的人正选择作为“外来务工人员（migrantworkers）”留居中国，这样他们可以回朝鲜看望家人。

Many escapees aim to settle in South Korea , but more are choosing to stay put in China as " migrant workers " so they can return to North Korea to see family members .

因此，正选择作用可能是维持这两种动物DRB基因多态性的主要机制之一。

These results provide evidences that positive selection is one of the main mechanisms in maintaining DRB gene polymorphism of the two species . 3 .

以NaCl作选择压力，将长期继代培养的葡萄愈伤组织经正选择方法筛选出耐0.75%NaCl的变异细胞系，并对其进行了生理生化特性研究。

A variant cell line of grape tolerant to 0.75 % NaCl is isolated from long term cultured calluses by using NaCl as selection pressure . The physiological and biochemical properties of this salt tolerant cell line are analyzed .

关于道路和居民点的影响：马鹿卧迹和取食点主要分布在距离公路600m到1km范围内，并表现出正选择；居民点附近则形成一个没有马鹿活动的半径为2.74km的缓冲区。

Wapiti bed-site and forage habitat were mainly distributed in the distance range from 600 m to 1 km to open road , and there was a buffer zone around resident area with radius 2.74 km , where no wapiti activity point was observed .

但许多学校正选择用技术手段来解决问题，比如“图尼丁”软件。

But many schools are turning to technological solutions like Turnitin .

红色果实在大部分鸟种中得到正选择。

Red color showed positive selection to most bird species .

选择提升的地球正选择去移出遗忘。

Earth in her choice to ascend is choosing to move out of forgetfulness .

这令人着迷，说明骑墙派的不可知论者正选择一种非常愚蠢的方法。

This is fascinating , suggesting that sit-on-the-fence agnostics are choosing a very foolish approach .

与之相比，在较为古老的谱系中相对缺少这种正选择压力。

By contrast , such selective pressure is not detected in more distantly related species .

经过检测这三个毒力相关因子的基因上都不存在显著的正选择压力。

There was no significant positive selection pressure in the genes of the 3 virulence-associated factors .

相反，亚洲地区正选择一些延缓、而非消除痛苦的短期举措。

Instead , the region is opting for short-term measures that defer rather than eliminate the pain .

中国人正选择用摄影来和世界连接，吸收各种理念。

Chinese have now turned to photography to connect with the world and to draw on ideas .

算法的主要算子包括正选择、记忆细胞产生、超变异和抗体相似性抑制。

The main operators of the algorithm include positive selection , memory cells producing , hyper-mutation and similar antibodies suppression .

我们还发现大量的血吸虫基因处于纯化选择压力之下，而少数基因则处于正选择压力下。

We also found that many schistosome genes were under the pressue of purifying selection and few were under positive selection .

利用密码子替换模型和最大似然法模型，检测位点间的正选择作用并分析了转铁蛋白分子适应性进化。

The codon-substitution and maximum likelihood models were used to detect positive selection effect among sites and analyze the molecular adaptive evolution of transferrins .

这些差异表明，在进化过程中粳稻和籼稻的靶序列发生了独立的进化事件，而且粳稻群体受到了更强的近期正选择作用。

These differences suggest that independent evolutionary events may have occurred in target sequences of two cultivated rice populations and stronger positive selection acted on japonica .

结果还提示，乙型流感病毒的演变同时受到很强的正选择与负选择的作用，而以前人们认为选择对乙型流感病毒的演变作用甚微。

Results also showed that the evolution of influenza B virus was under both strong positive selection and negative selection , which was contrary to previous reports .

两栖类抗菌肽具有高度多样性，这种多样性是通过定点突变、正选择、平衡选择等多种机制来产生和维持的。

Antimicrobial peptides ( AMPs ) are highly polymorphic molecules . The diversity is originated from mechanisms such as focal mutation , positive selection and balanced selection .

我们应用最大似然法分析了丙型肝炎病毒的包膜蛋白编码序列，从全世界18个常见的基因型／亚型中，发现了4个正选择／适应性位点。

We analyze the hepatitis C virus ( HCV ) envelope protein-coding sequences from 18 general geno / subtypes worldwide , and find 4 amino acid sites under positive selection .

该耐受过程伴随着动态的正负选择，正选择保持抗原特异性T细胞输出。保护胸腺是目前惟一能够维持输出抗原特异性T细胞的手段。

This tolerance duration was accompanied by dynamic positive and negative selections , and positive selection kept the output of antigen specific T cells , which could be maintained only by the protection of thymus .

转基因本身的分离对于研究转基因逃逸引起的生态风险具有重要意义，如果转基因在遗传过程中受到正选择，转基因就可能在野生群体中逐步扩散开并对野生群体产生一系列生态影响。

Separation of transgene is very important for the study of ecological risk caused by transgene escape , if the transgene gets positive selection in the genetic segregation , the transgene in the wild population may gradually spread into the wild population and produce lots of ecological impact .

以三种杯[4]芳烃衍生物为载体的PVC膜季铵盐正离子选择电极的研究

Studies on the Characteristics of Three Novel PVC Membrane Quaternary Ammonium Cation Selective Electrodes Based on Calix [ 4 ] Arene Derivatives

正丁烷选择氧化过程中VPO体系的表面物种

Surface Species on VPO Catalyst in n-Butane Selective Oxidation

正丁烷选择氧化中V-P-O催化剂的晶相和选择性

Selectivity and Crystal Phase of V-P-O Catalyst for Selective Oxidation of n - Butane

正丁烷选择氧化反应制顺酐动态动力学模型的建立

Transient Kinetic Modeling of n-Butane Selective Oxidation to Maleic Anhydride