查询词典 racemization

The direct incorporation of U-13C glucose was estimated by the intensity increase of m/z to F(F was parent fragment, and n was the carbon number in the fragment), while the total isotope incorporation from the added 13C could be calculated according to the abundance ratio increment summation from m/z (Fa+1) through (Fa was the fragment containing all original skeleton carbons, and T was the carbon number in the amino acid molecule). The 13C enrichment in the target compound was expressed as atom percentage excess, and that of D-amino acid needed to be corrected by the coefficient of hydrolysis-induced racemization. The 13C enrichment reflected the carbon turnover velocity of individual amino acid enantiomers, and was powerful to investigate the dynamics of soil amino acids.

外加葡萄糖直接合成氨基酸的比例可利用质谱碎片的相对强度变化来评价（n为质谱碎片F中含有的碳原子数目）；而源于葡萄糖的13C同位素在氨基酸分子中的富集程度是所有同位素峰相对强度变化的总和。13C在目标化合物中的富集比例用原子百分超评价，D氨－基酸的APE还需进一步利用水解诱导的外消旋化系数校正。13C在目标化合物中的富集程度可反映各氨基酸手性异构体的碳循环速率大小，是研究土壤氨基酸动态变化的有力工具。

The racemization of hydantoin will be a speed limited step of the production of D2N2 carbamoylase.

目前关于 52单取代海因的消旋的文献非常少，海因消旋的细节问题也没有被完全揭示。

As so far, there is just a little of literature of L252 monosubstituted hydantoin, and the details of the racemization of hydantoin are not revealed.

目前关于 52单取代海因的消旋的文献非常少，海因消旋的细节问题也没有被完全揭示。

Therefore, the auto racemization of L252 monosubstituted hydantoin is an important step of the production of L2 or D2N2 carbamoylase.

因此 ，52单取代海因的自发消旋成为L2或D2N2氨甲酰氨基酸生产中的一个重要的步骤。

From the half life of the hydantoin racemization, could be seen increase the temperature and pH are both good for the racemization, but if the pH value is too high the alkaline hydrolysis will happen and make some loss.

由海因消旋的半衰期可看出提高温度和pH对海因的消旋均有利，但pH过高的情况下海因则会发生碱解反应从而造成损失。

If the ratio of the auto racemization of the hydantoin is Multi-purpose water bath ch lower than the hydrolytic ratio of hydantoin hydrolase?

若海因的自发消旋速率远低于海因水解酶的水解速率，则海因的消旋将成为D2N2氨甲酰氨基酸生产中的一个限速步骤。

If the ratio of the auto racemization of the hydantoin is much lower than the hydrolytic ratio of hydantoin hydrolase, the racemization of hydantoin will be a speed limited step of the production of D2N2 carbamoylase.

若海因的自发消旋速率远低于海因水解酶的水解速率，则海因的消旋将成为D2N2氨甲酰氨基酸生产中的一个限速步骤。

In the case of substances known to undergo racemization or mutarotation, care should be taken to standardize the time between adding the solute to the Solvent and introduction of the solution into the polarimeter tube.

对于检测已知具有外消旋或变旋作用的物质，应当小心地采取措施对向溶剂中加入溶质和将溶液加入旋光计管道的间隔时间进行标准化。

Resolution and racemization of the selected neutral amino acids, phenylalanine and proline, were studied.

选择了苯丙氨酸和脯氨酸中性氨基酸进行拆分和消旋过程的研究。

The methods of synthesis and racemization of Naproxen ester were studied and the most suitable methods for synthesis and racemization of Naproxen ester were determined.

第二章主要研究了在萘普生拆分过程中涉及到的有机合成，对萘普生酯的合成和消旋方法做了系统的研究，从中确立了最适宜的合成和消旋方法。

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。