对映体

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 reaction-diffusion model was developed to analyze the concentration of enantiomers and the separation factor of the enantioseparation process of chiral emulsion liquid membrane by studying the principle and some factors of mass transfer process. The mass transfer resistance of boundary layer in outer aqueous phase and the interfacial chemical reactions at the liquid membrane interfaces were taken into account in the model equations.

通过对乳状液膜手性分离过程中传质机理的研究以及各影响因素的分析，得到了可以分析和预测乳状液膜手性拆分过程传质的反应-扩散模型，该模型同时考虑了外水相边界层的扩散阻力和手性对映体与载体的反应阻力。

The influence of polar modifier and column temperature on enantioseparation of benzoin on Chiralcel OD-RH systematically was also studied in the thesis.

另外，安息香对映体在Chiralcel OD-RH柱上的色谱拆分保留机理，特别是极性有机溶剂及柱温度对安息香拆分的影响也是本论文的研究内容。

Furthermore, the selective reductions of 2,2'-dinitrobiphenyl have been detailedstudied in the synthesis of achiral biphenyl backbones.

运用不对称活化的策略，成功地在Cu催化Et_2Zn对链烯酮的1，4-共轭加成反应中获得了高对映体选择性的加成产物。

In chapter five, effect of temperature on the chiral separation of the molecular imprinting polymer was investigated and it was found that the chiral separation process was enthalpy-controlled.

第五章考察了温度对分子烙印聚合物的手性拆分能力的影响，进一步加深了对分子烙印手性固定相分离对映体的作用机理的认识。

The total synthese three natural compounds to explore enantioselective synthesis of flavanol: We use phloroglucin and 2, 4, 6-trihydroxyacetophone as starting materials to synthesis distenin in two ways; Resorcin was used to synthsis 2, 5-dimethoxymethoxyacetophone though 3 steps.

对黄烷醇化合物的立体选择性全合成进行了探索：以间苯三酚和2，4，6-三羟基苯乙酮为原料，尝试用两条路线对Distenin化合物进行了全合成研究；以对苯二酚为原料，经三步制得2，5-二甲氧甲氧基苯乙酮，与2，4，6-三甲氧甲氧基苯甲醛反应，经四步反应得到天然产物3，5，7，2′，5′-二五羟基黄烷关键中间体1-（2′，6′-二甲氧甲氧基苯）-3-（2"，4"，6-三甲氧甲氧基苯）丙烷-1R，2R-二醇83及其对映体84；简要介绍了EGCg类化合物的生物活性和研究概况。

The total synthese three natural compounds to explore enantioselective synthesis of flavanol: We use phloroglucin and 2, 4, 6-trihydroxyacetophone as starting materials to synthesis distenin in two ways; Resorcin was used to synthsis 2, 5-dimethoxymethoxyacetophone though 3 steps.

对黄烷醇化合物的立体选择性全合成进行了探索：以间苯三酚和2，4，6-三羟基苯乙酮为原料，尝试用两条路线对Distenin化合物进行了全合成研究；以对苯二酚为原料，经三步制得2，5-二甲氧甲氧基苯乙酮，与2，4，6-三甲氧甲氧基苯甲醛反应，经四步反应得到天然产物3，5，7，2′，5′-二五羟基黄烷关键中间体1-（2′，6′-二甲氧甲氧基苯）-3-（2&，4&，6-三甲氧甲氧基苯）丙烷-1R，2R-二醇83及其对映体84；简要介绍了EGCg类化合物的生物活性和研究概况。

Some studies showed that SPs display toxicity to wildlife and human nervous systems. It may cause acute and chronic neurotoxicity to mammal, and the stereoisomeric structure of SPs affects mammals neurotixicity. There was some enantioselectivity of SPs in acute and chronic neurotoxicity to mammal.

已有研究结果显示拟除虫菊酯类农药对非靶标野生动物和人类的神经系统有一定的毒性作用，其对哺乳动物的神经毒性主要表现为急性和慢性神经毒性，而且其毒性作用与拟除虫菊酯类农药的立体结构相关，有一定的对映体选择性差异。

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。

METHODS: After a single ip dose of trans-T hydrochloride or Ml, the rats were killed by decapitation. A high performance capillary electrophoresis method was used to determine the concentrations of enantiomers of trans-T and Ml in the serum and different brain tissues, including cerebrospinal fluid, cerebral cortex, corpus striatum, hypothalamus, cerebellum, and medulla oblongata.

大鼠ip单剂量的盐酸trans-T或Ml后，采用高效毛细管电泳法测定血清和不同脑组织中trans-T及Ml对映体的浓度，脑组织包括脑脊液、大脑皮层、纹状体、下丘脑、小脑、延髓。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。