查询词典 acetyl

The degree of butyryl substitution of CAB increased and the degree of acetyl substitution of CAB decreased as the butyryl mol content in the reaction system increased.

制备得到的纤维素醋酸丁酸酯的丁酯取代度最高可达2.53，乙酯取代度最高可达2.98。

The results showed that the degree of butyryl substitution of CAB increased and the degree of acetyl substitution of CAB decreased as the activation time increased. The degree of substitution of CAB changed slightly after the esterification went along about 2h.

随着活化时间的增加，CAB的丁酯取代度会逐渐增大，乙酯取代度会逐渐减小；酯化反应2h后，CAB取代度变化不大；CAB的丁酯取代度随着反应体系中丁酰基摩尔分数的增加而增大，而乙酯取代度则随着丁酰基摩尔分数的增加而减小。

Cellulose acetate butyrate with high or low degree of butyryl substitution was synthesized in heterogeneous system(butyric acid/ acetic acid/ butyric anhydride/ sulfuric acid) using the "free solvent" method. The effect of activation time, esterification time, the molecular weight of cellulose and the content of the organic acid or anhydride on the degree of acetyl and butyryl substitution of cellulose was discussed.

在非均相体系中进行酯化反应，采用&反应性溶剂&，以硫酸作为催化剂合成出从高丁酯含量到低丁酯含量的纤维素醋酸丁酸酯，研究有机酸以及酸酐的添加量、活化时间、酯化反应时间以及原料纤维素的分子量对酯化产物纤维素醋酸丁酸酯的影响。

Except heptanoyl chitin, four of them,i.e.acetyl chitin,propionyl chitin,butyryl chitin and hexanoyl chitin,had high degree of substitution(from 1.5 to 2.0)and exhibited lyotropic liquid crystalline behavior and cholesteric phase.

文摘：四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相。

Based on the analysis of the crystal structure of TTR-AcCoA complex and the property of its substrate TbL, a single-step mechanism through which TTR catalyses the inactivation of Tabtoxin by transfer an acetyl group to the toxin was proposed.

通过对TTR的序列及结构特征的分析，表明TTR属于GCN5相关的N乙酰基转移酶超家族，并且具有GNAT超家族蛋白中保守存在的组蛋白乙酰基转移酶催化核心。

The result makes clear, with anhydrous chloridize zinc, sulfur acting acetyl amine is raw material, it is OK to use chemical method the ZnS Na Mijing that preparation bead diameter controls in 10 Nm, earning sample is α- construction of mine of ZnS fine zinc, 6 brilliant are, form appearance is globose or close globose.

结果表明，以无水氯化锌、硫代乙酰胺为原料，采用声化学法可以制备粒径在10 nm左右的ZnS纳米晶，所得样品为α-ZnS纤锌矿结构，六方晶系，形貌为球形或近球形。

The main products are: phosphorous acid, acetyl chloride, cyclohexyl chloride.

主要产品有：亚磷酸、乙酰氯、环已甲酰氯。

To provide a non-toxic, zero-residue and effective approach to prevent the parasitical Ascaris suum, the effect of kaempferol-3-a-L-(4-O-acetyl)-rhamnose-7-a-L-rhamnoside,extracted from Cyrtomium yunnanense, on the the animals infected with A. suum was studied.

为猪蛔虫病的防治提供无毒、无残留，对人体无害的高效防治方法，利用云南贯众分离得到的化合物山奈酚－3-a-L-（4-O-乙酰基）鼠李糖基－7-a-L-鼠李糖苷作为试验用药，对感染猪蛔虫的动物进行了药效试验研究。

In this fashion the four entering carbons of two acetyl-CoA molecules are conserved to form one 4-carbon dicarboxylic acid.

用这种方式，由两个乙酰辅酶A引进的四个碳，转变成一个四碳二羧酸。

The product includes the licorice frost, licorice paste, licorice acid, Acetyl Glycyrrhetic Acid, Crude Disodium Glycyrrhizininate, Dipotassium Glycyrrhizininate, Monopotassium Glycyrrhizininate, Diammonium GlycyrrhizininateDiammonium Glycyrrhizininate, Monoammonium Glycyrrhizininate etc.

产品有甘草霜、甘草膏、甘草酸、乙酰甘草次酸、甘草酸单铵盐、甘草酸单钾盐、甘草酸二钾盐、甘草酸三钾盐、甘草酸二钠盐、高纯甘草酸等品种。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。