不对称

Chirality is one of intrinsic properties for the nature. All the reactions relative to the living activity carry out in highly asymmetric environment.

手性是人类赖以生存的自然界的本质属性之一，生命现象中的化学过程都是在高度不对称的环境中进行的。

The substrate coupling reaction system catalyzed by recombinanted CAR wasconstructed. It can be used for asymmetric reduction of 2'-chloroacetophenone and coenzyme regeneration with 2-propanol or 2-butanol as the cosubstrate.

5应用重组CAR不对称催化还原2'-氯-苯乙酮，通过加入异丙醇或仲丁醇作为辅助底物，建立了底物耦联反应体系实现辅酶NADH原位再生的反应体系。

AIM: To synthesize 2 novel chiral ligands derived from cinchona alkaloids and study their catalytic performance in asymmetric dihydroxylation of 5 olefins.

目的：合成两种新的金鸡纳生物碱类衍生物配体并将其用于催化五种烯烃的不对称二羟化反应，考察催化效果。

The Pt/FDU-14 catalysts can be effectively applied in the asymmetric hydrogenation of ethyl pyruvate after chirally modified with cinchonidine.

考察了经过手性分子辛可尼定修饰后的Pt/FDU-14催化剂在丙酮酸乙酯不对称氢化反应中的催化性能。

In the asymmetric hydrogenation of ethyl pyruvate catalyzed by 0 5% Rh/PVP TiO 2, the chiral modifier cinchonidine not only induces the enantioselectivity, but also accelerates the reaction rate greatly.

研究了辛可尼定作手性修饰剂修饰的负载型纳米铑簇合物催化剂(0 5 %Rh/PVP TiO2 )催化丙酮酸乙酯不对称氢化反应，在该反应中手性修饰剂辛可尼定不仅具有对产物生成的手性诱导作用，而且对反应具有明显加速作用；在优化反应条件后，反应的TOF和对映选择性分别可以达到 5 8 0min-1和

METHODS: Inexpensive quinine and cinchonine were transformed to 9NH2quinine and 9NH2cinchonine, which reacted with 4chlorobenzoyl chloride to afford 2 novel chiral ligands. The AD reactions of olefins were performed in H2OtBuOH (1∶1) using the 2 ligandsK2OSO24 as catalysts.

以价廉易得的奎宁和辛可宁为原料，经过结构转换得到9氨基奎宁和9氨基辛克宁，进而与对氯苯甲酰氯反应制得两种新型手性配体，并将其用于锇催化的烯烃的不对称双羟化反应。

And extended them to asymmetric $3$-stage Clos network.

而我们也将这个结果推广到不对称的情况，甚至我们还在多重对数网路上也得到了同样的结果。

ISO 9000 quality decertify system virtue tertium quid notarial,advised buyer have confidence about products and servive quality when the information unequal,so the seller dare point is build quality decertify system standard,and coidentity inspect agenda asking, to securement products quality assurance management proceeded to molding business imagery.

ISO 9000品保认证系统藉由第三者的认证，提供买方在资讯不对称下能对卖方的产品或服务品质深具信心，故卖方的挑战点便是建立品保系统之标准，及一致性的稽核程序之要求，以确保产品品质保证管理进而塑造企业形象。

Another is using of collateral device in loan contract,and this mechanism is indirect.

一种是对信用信息的直接生产机制，该机制可以减少信贷市场的信息不对称；一种是通过设置抵押条款，发挥抵押对信用信息的间接信号传递功能。

From time to time asymmetrical garment, such as single-sleeved tops or skirts that longer on one side come into vogue as a reaction to the natural rule.

From不时不对称的服装，如单袖衫或裙子，较长的一边开始流行的一种反应自然rule。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。