对映的

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。

Based on the addition of vinyl magnesium bromide to the chiral non-racemic synthon 2 derived from-1, an enantioselective total synthesis of-3, the antipode of marine alkaloid halitulin 10 steps, overall yield: 5.3% from (R-1 was achieved using aza-Claisen rearrangement as a key step.

取得的主要结果如下：一、从-苯基甘氨醇1出发，通过已知的哌啶手性合成砌块2的加成反应，建立了经aza-Claisen重排反应进行海洋生物碱halitulin手性分子片断的对映体--isohaliclorensin 3不对称合成的路线。

Based on the addition of vinyl magnesium bromide to the chiral non-racemic synthon 2 derived from-1, an enantioselective total synthesis of-3, the antipode of marine alkaloid halitulin 10 steps, overall yield: 5.3% from (R-1 was achieved using aza-Claisen...

取得的主要结果如下：一、从-苯基甘氨醇1出发，通过已知的哌啶手性合成砌块2的加成反应，建立了经aza-Claisen重排反应进行海洋生物碱halitulin手性分子片断的对映体--isohaliclorensin 3不对称合成的路线。

In addition, higher enantioselectively was obtained when the groups on the oxazoline ring were less sterically demanding. That is, substrate will be closer to the backbone of ferrocene.

我们发现当恶唑啉上取代基立体位阻减小时我们发现当恶唑啉上取代基立体位阻减小时，产物的对映选择性就会相对较高，因而平面手性的影响很可能就是通过二茂铁非取代茂环和底物及亲核试剂之间的相互作用而产生的。

Chinese Academy of Inspection and Quarantine, Beijing 100025, China Abstract: This article reviewed the development of fipronil and its metabolites, emphasizing the fate of environment, action of fipronil and toxicology of antimer and metabolites.

中国检验检疫科学研究院，北京 100025 摘要：综述了氟虫腈及其代谢物近年来的研究进展，涉及氟虫腈及其代谢物在环境中的迁移与转化、氟虫腈的作用机理、对映体的毒性差异。

It is of synthetically HMG-CoA reductase inhibitors which is only including one single enantiomer in full form. The effect of reducing triglycerides is the most observably in TATIN drugs.

匹伐他汀钙2003年9月在日本上市，本品为单一对映体形式的全合成的HMG-CoA还原酶抑制剂，其降低甘油三酯的作用可能是他汀类药物中最强的。

After the completion of reaction, ether is added to the resulting mixture to precipitate the tartrate and filter to recover the ligand. The recovered ligands keep good enantioselectivity only in first recycle, but compared with solution-phase of tartrate counterpart, using of soluble polymer-supported tartrates largely simplifies the workup of sharpless epoxidation.

反应完成后，向反应体系中加入乙醚使配体沉淀，过滤即可回收配体，虽然回收的配体只在第一次循环中保持了较好的对映选择性，但与使用小分子酒石酸酯配体相比，使用可溶性聚合物支载的酒石酸酯极大地简化了Sharpless环氧化反应的后处理。

With high efficiency, high selectivity, security and environmental friendship, the biocatalysis possesses significant advantages over chemical catalysis in organic synthesis, especially in the asymmetric synthesis of the enantiomerically pure compounds and in the resolution of racemates.

生物催化的高效性、选择性、安全性以及环境友好等优点，使其在一些化学合成领域，特别是在对映体纯的手性化合物的合成和消旋体拆分等方面，具有化学催化不可比拟的优势。

The 5-cm short CD-based column exhibited rapid separation ability to the above β-blocker drugs within 5 min, which indicated that the separation has high efficiency.

所制备的短柱具有快速分离的特点，在5 min内实现了上述5对手性药物对映异构体的分离，具有较高的分离效率。

PH of aqueous phase has an important influence on BLM resolution.

得出厚体液膜拆分的一般规律，即其拆分属于动力学拆分过程，适当提高手性载体的浓度有利于提高对映单体流量和拆分的立体选择性，水相pH值对于拆分性能有着重要的影响。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐