查询词典 racemization

A method for preparing D-valine from L-valine by racemization and chemical resolution is presented.

介绍了L 缬氨酸经消旋化及化学拆分制备D 缬氨酸的方法。

In the presence of 0.10 molar equivalent of salicylaldehyde, L-lysine racemization can be completed within 4 h in 1.0 mol/L of NaOH at 100℃.

在在场的0.10摩尔相当于水杨醛， L -赖氨酸消旋可以完成4小时，在1.0 mol / L的氢氧化钠在100 ℃。

The racemization had an isotope effect k(subscript H/k of 1.9 at 42℃.

该消旋反应有一同位素效应k(下标 H/k，在42℃时为1.9。

Effects of carboxylic media in the racemization of neutral amino acids catalyzed by salicylaldehyde were investigated.

继而研究了羧酸溶剂中水杨酸催化的中性氨基酸消旋。

The study of aspartic acid racemization and bone or teeth histology on these samples also indicates poor DNA preservation in these areas.

对这一地区的大熊猫骨骼和牙齿的氨基酸外消旋和组织学研究也揭示了这一地区古DNA保存较差。

Racemization is the conversion of an optically active form

外消旋作用是把一种化合物的光学活性形式转化为外消旋的混合物；这个过程的逆过程称为拆分。

This intermediate is responsible for the stereoselective nucleophilic substitution and the subsequent racemization of 3-EtO-NDZ enantiomers in acidic ethanol.

该中间体导致了3-EtO-NDZ对映异构体在酸性乙醇中所发生的立体选择性亲核取代反应及随后的消旋过程。

New method of racemization of L-Phenylalanine in aqueous solutions at ambient conditions was found and its industrialization process was successfully carried into execution.

常压下L形苯丙氨酸在水溶液中的消旋新方法首次发现并在工业上成功研究，建立了相应的L-苯丙氨酸水溶液消旋动力学模型。

In this paper, not only the mechanism of thermal degradation of polylactide is introduced, but also the kinds of metal catalysts, their influence on L-lactide formation and racemization through thermal degradation of PLLA are referred.

本文介绍了聚乳酸热降解的反应机理，详细阐述了添加的金属催化剂的种类，及其催化PLLA热降解生成L-丙交酯及发生消旋化作用的机理。

Racemization is the conversion of an optically active form of a compound into a racemic mixture; reversing this process is called resolution.

外消旋作用是把一种化合物的光学活性形式转化为外消旋的混合物；这个过程的逆过程称为拆分。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。