外消旋作用

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。

Results indicated that the-enantiomer showed significantly higher activity on cucumber and sorghum fresh weight inhibition than that of the-enantiomer, and also higher than that of the racemate at the same rate.

结果表明，单一左右旋对映体和等量的外消旋处理的高梁和黄瓜鲜重抑制作用差异显著，右旋体活性明显高于左旋体，也明显高于等量的外消旋体。

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。

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。

Racemization is the conversion of an optical ly 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。

Racemization is found with optically active substrates.

发现旋光基质有外消旋作用。

D2 hydantoinase (EC3151212) can change the D type racemates of the racemic D,L252 monosubstituted hydantoin to D2N2 carbamoylase, and the leftover L252 monosubstituted hydantoin due to never reacted with D2 hydantoinase, shown as figure 1, firstly racemizing, thus makes the D,L2 hydantoin completely changes to pure optical D2N2 carbamoylase, and then be changed to D2 amino acid.

海因酶具有底物特异性，D2海因酶(EC 3151212)可转化外消旋的D ，L252单取代海因中的D型消旋体成为D2N2氨甲酰氨基酸，剩余的L252单取代海因由于完全不被 D2海因酶所作用，如图 1所示，先进行消旋，从而使得 D ，L2海因完全转化为光学纯的 D2N2氨甲酰氨基酸，并进一步被转化为D2氨基酸。

It has also been discovered that, before complete purification, the synthetic HWTX-Ⅰ, after oxidative treatment, showed wider and more asymmetric peaks than the native HWTX-Ⅰ that was denatured and then renatured under the same experimental conditions, which suggests that there is even greater conformational unhomogeneity in the synthetic HWTX-Ⅰ.

推测除了在合成HWTX-Ⅰ复性过程中有少数分子发生二硫键错配外，还有部分分子在固相合成中发生了消旋作用，需要交替采取多种色谱法才能完全分离纯化复性后的合成多肽产物。

The hydrogen bonding and π-π interactions between the chiral stationary phase and the polar group of racemates may be responsible for the chiral recognition.

手性固定相与外消旋样品上的极性基团之间的氢键作用和π-π作用可能是进行手性识别的主要原因。

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。