羰基的

Because of its nonpoisonous, DMC can substitute phosgene , dimethyl sulfate or methylating used as methyl pharmaceutical to improve the security of production and reduce the environmental pollution; As the solvent, DMC can substitute fluorine lyons , methyl chloroform , trichloroethylene , benzene , dimethylbenzene, etc.. And it can be used as the paint dope, clean solvent. As gasoline additive, DMC can raise hard octane value and oxygen content and improve its antiknock possibility.

由于DMC无毒，可替代剧毒的光气、硫酸二甲酯等作为甲基化剂或羰基化剂使用，提高生产操作的安全性，降低环境污染；作为溶剂，DMC可替代氟里昂、三氯乙烷、三氯乙烯、苯、二甲苯等用于油漆涂料、清洁溶剂等；作为汽油添加剂，DMC可提高其辛烷值和含氧量，进而提高其抗爆性。

For the asymmetric reduction ofα-hydroxyacetophenone and ethyl 4-chloro acetoacetate,-1-phenyl-1,2-ethanediol and-ethyl 4-chloro-3-hydroxybutanoate were produced by the purified enzyme, with the 99% and 94.3% e.e. value respectively.

在纯酶水平验证了近平滑假丝酵母(Candida parapsilosis CCTCCM203011)对外消旋苯基乙二醇的拆分机理，整个去消旋过程是由-苯基乙二醇次级醇脱氢酶和羰基还原酶共同催化完成的。

The hydroxyl oxygen atoms O(5) and O(6) with O(3) and O(4) of adjacent unit form the intermolecular hydrogen bondings.

分子中的酚羟基氧原子 O(5 )和 O(6 )均与另一个不对称单位的羰基氧原子 O(3 )和 O(4)形成了分子间氢键，这表明分子在晶胞内堆积时，除了范德华力以外还靠氢键来维系。

The dependences of third-order optical nonlinear on the molecular structures of polymethine cyanines were thoroughly analyzed by introducing the simplified free electron model and the time-dependent perturbation theory.

对咔唑羰基铬配合物还观察到了来自金属到配体的电荷转移特征吸收带；(3)采用皮秒前向简并四波混频技术测试了所有目标分子的三阶非线性极化率、二阶超极化率以及非线性折射率等非线性光学参数。

The lipid oxidation of the muscles of breast and leg in dry-cured duck during processing was studied by determination of the peroxide value,TBARS value,carbonyl compounds and conjugated dienes.

通过对过氧化值、硫代巴比妥酸值、羰基值和双烯值等氧化指标的测定，研究南京板鸭加工过程中各工艺点板鸭肌肉脂肪的氧化变化。

And the application of glycollic acid in the fields of chemical cleaning, auxiliaries and materials were introduced in detail.

概述了羟基乙酸几种主要工业合成方法的工艺条件及存在的主要问题，即氯乙酸水解法、氰化法、甲醛羰基化法和一氯乙酸钾水解法。

A brief account of technique conditions of several main technique routes for synthesizing glycollic acid and existing main problems in it are given.

概述了羟基乙酸几种主要工业合成方法的工艺条件及存在的主要问题，即氯乙酸水解法、氰化法、甲醛羰基化法和一氯乙酸钾水解法。

Recent advances in addition,reduction,and asymmetric reactions of imines were reviewed.

亚胺是一类羰基化合物与氨的缩合产物，作者综述了近年国内外亚胺在加成、还原和不对称反应等方面的研究进展

The asymmetric reduction of prochiral P-oxo ester, aromatic ketone and aliphatic ketone to its corresponding chiral alcohol by yeast cells were studied respectively in this work when ethyl 4-chloro-3-oxobutyrate, acetophenone and 2-octanone were as the model substrates.

本文以4-氯乙酰乙酸乙酯、苯乙酮和2-辛酮分别为β-羰基酯、芳香酮和脂肪酮的模型底物，研究了利用活性酵母细胞催化这三类前手性酮不对称还原合成相应手性醇的反应特性。

In this dissertation, the efforts were focused on asymmetric cyanation of acitive ketones and asymmetric Henry reaction.

本文致力于催化羰基化合物的不对称腈化反应和不对称Henry反应研究，取得了一些具有重要学术意义和应用前景的创新性结果。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。