选择性

This paper elaborates on the concept of directed molecular evolution, procedure, basic strategies, and its core technology, then presents emphatically its application and achievements in improving enzyme activities, stability, substrate specificity, and antipode selectivity and so on.

本文详细综述了酶的分子定向进化的概念、过程、基本策略及其核心技术，并着重介绍了酶的分子定向进化技术在提高酶的活力、稳定性、底物特异性和对映体选择性等几方面的应用及取得的相关成果。

The cyclodextrin improves the catalytic reduction efficiency of yeast juice, increases the stereo selectivity for bottom object, improves evidently thepercent conversion of bottom object and the antipode excess value of outcome.

环糊精提高了酵母液的催化还原效率，同时增加了对底物的立体选择性，明显提高了底物的转化率和产物的对映体过量值。

The appearance of-enantiomer after incubation with single-enantiomer revealed the enantiomeric inversion of-isomer to its antipode. While no obvious stereoselective degradation or enantiomeric inversion were observed in other test soils.

左右旋对映体在3~#土壤中的降解速率有明显差异，二者半衰期相差0.95周；添加外消旋体培养6周后ER值达到1.65，表明左旋体被优先降解；同时在该土壤中存在左旋体向右旋体的转化现象；在其他几个土壤中均未有明显的选择性降解或对映体转化现象。

Clau (5, 10, 20〓) was bound to rat plasma a greater extent than clau, while in rabbit plasma the reverse was the case. By Scatchard plots using bovine serum albumin, clau had a higher equilibrium constant and the greater numbers of binding sites than its antipode.

在与大鼠血浆蛋白的结合中，clau的结合率平均为28.37±0.31（n=3，三个剂量5，10，20μM），clau的结合率平均为38.05±2.61（n=3），clau结合率低于clau；而在与兔血浆蛋白的结合中，clau的结合率平均为47.21±4.91（n=3，三个剂量），clau的结合率平均为41.43±5.21（n=3），clau的结合率略高于clau；在与牛血清白蛋白的结合中，clau的结合率也高于clau，立体选择方向与兔血浆蛋白结合相同，而与大鼠血浆蛋白结合相反，提示存在种属差异；在与系列浓度的牛血清白蛋白结合中，通过Scatchard作图法求得蛋白结合点数和平衡常数；在clau，N和K分别为90.02±35.76和5.326±1.196（n=4）；在clau，N和K分别为59.92±20.39和4.203±1.250（n=4），两者的比值分别为1.50和1.27；进一步说明clau对映体的蛋白结合存在立体选择性差异。

The differences in metabolism of clau antipodes suggested that there may be different expression of P4503A in rat liver.

clau对映体的整体药物动力学研究表明，两者存在着立体选择性差异。

We administered a novel action comprehension test--with almost no linguistic requirements--on selected frontal aphasic patients lacking apraxic symptoms.

我们对无使用症状的选择性额叶失语症患者进行一项新型行为理解能力测试。

Recently,LDL apheresis has been applied in clinic and achieves a satisactory effect.

近年来，去除LDL的血液净化疗法逐渐应用于临床，其中的吸附剂吸附法由于对LDL具有选择性吸附，所以取得了较好的疗效。

Then for discrete time single-input single-output system,a theorem of Hankel-norm approximation is proposed and proved.

相反，有限脉冲响应滤波器可以得到严格的线性相位，但是要获得一定的选择性则信号时延较大。

The experimental results show that it is necessary to treat the formation with the temporary plugging agent to seal the pay zones for selectively injecting gel into aqueous layers when the effluent water pressure is higher than that of pay zones, or the fractures in oil-bearing zones are much wider than those in the aqueous layer.

在油井水层出水压力高于油层压力或者产油层裂缝大于出水层裂缝情况下，采用笼统注入方式堵水须进行暂堵处理，以封住产油层，使堵剂主剂选择性进入水层。

It is possible that the ardor of foreign migration is more selective of hardy biological stock.

这大概是外国移民的生命力具有较强的生物系世系的选择性之故。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。