乙酸的

With cerous ammonium nitric-ethylene diamine tetraacetic acid as an initiator, and with the protection of the nitrogen the graft-copolymerization of methylacrylic acid and vinyl acetate on chitosan grafting was studied.

以硝酸铈铵－乙二胺四乙酸为引发剂，在N2气的保护下，研究了壳聚糖与甲基丙烯酸和醋酸乙烯酯两种单体的接技共聚反应。

Methyl chloroacetate is used widely as a industrial material,for example as a middle material in pesticide and medicine making.

氯乙酸甲酯是一种应用广泛的化工原料，多用于医药、农药生产的中间体，本试验对其进行了卫生毒理学评价。

Synthesis of ethyl chloroacetate with chloroacetic acid and ethanol catalysed by GdCl2-EDTB-H3SiW12O40was investigated.

研究了反应时间、醇酸比、带水剂用量及催化剂用量对杂多酸化合物GdCl2-EDTB-H3SiW12O40催化合成氯乙酸乙酯的影响，确定了最佳反应条件，醇酸摩尔比1.5∶1，带水剂量10mL，催化剂使用量为酸的1.0%，反应时间2.5h

Fibers with different degrees of carboxymethylation were prepared by controlling the ratio of the weight of fiber to chloroacetic acid.

通过控制氯乙酸和纤维的质量比得到不同反应程度的羧甲基纤维素纤维。

Based on the result of orthogonal experiment, theoptimum condition of the esterification reaction of chloroacetic acid with polyethylene glycolwas determined.

采用正交实验法对合成的双氯乙酸聚乙二醇酯的反应工艺条件进行了优化，确定了最佳合成路线。

Application of organic acid catalysis to the polymerization of pyrroles and pentafluorobenzaldehydes, with the xylene as reaction medium instead of expensive collidine used in the conventional methodology, resulted in a relatively high yield of TPFPPH〓.

本研究利用有机酸如氯乙酸催化吡咯和五氟化苯甲醛聚合，并以二甲苯替代传统方法所用的昂贵溶剂2，4，6-三甲基吡啶，获得了产率较高的TPFPPH〓。

Methods: Coloclysis the rats with 10% acetic acid solution to create acute colonitis model, after 24 hours, inject 2.5% Evan blue saline solution into the tail veins of the rats. Then, by detecting the photo-absorption rate of the EB in the tissues of the different zones of forepaws to indirectly examine the changes of blood contents in the different areas.

给予大鼠10%乙酸溶液灌肠复制急性肠损伤模型，24 h后从尾静脉注射2.5% Evans blue生理盐水溶液，通过测量前爪不同区域内EB的吸光度值大小，间接了解左右前爪各区域血含量的变化情况。

The emphasis was on chemical properties,application,main production methods,market,and prospects of main deriva- tives of acetaldehyde such as ethyl acetate,pentaerythritol,glyoxal,peracetic acid, crotonaldehyde and pyridine.

介绍了国内外乙醛及其主要衍生物的生产技术发展及其市场供需状况，尤其对乙醛主要衍生物乙酸乙酯、季戊四醇、乙二醛、乙醛酸、丁烯醛、吡啶的化学性质与用途、主要生产方法、市场供需状况及开发前景作详细介绍和分析。

Catalyzed by KF-Al2O3, Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate under microwave irradiation without solvent has been found to proceed with high yield.

采用KF-Al2O3为催化剂，在无溶剂微波辐射下苯甲醛与氰基乙酸乙酯发生 Knoevenagel 缩合反应，得到了较高的产率，并考察了反应条件对产率的影响。

As to the catalytic coupling of aryl bromides, when triphenylphosphine as ligand and malononitrile as subtracts, their isolated yields were generally in 72-88%; While using cyanoacetate instead of malononitrile, the yields were in 67-84%.

当采用常见的三苯基膦为配体、对取代溴苯而言，以丙二腈为底物时，偶联产物的分离产率一般都在72-88％之间；以腈基乙酸乙酯为底物时，分离产率在67-84％之间。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。