乙酸

The surface hydroxyl group onto magnetic polyvinyl acetate nanoparticles can be obtained by saponification reaction on their surface.

结果表明，磁性聚苯乙烯颗粒与丁二酸酐发生Freidel-Crafts酰基化反应，可以在颗粒表面引入少量羧基；磁性聚甲基丙烯酸甲酯颗粒分别与乙二醇、二缩三乙二醇、聚乙二醇等发生醇-酯交换反应，可以在颗粒表面接枝不同分子链长度的末端羟基；磁性聚醋酸乙烯酯颗粒经过醇解或皂化反应可以获得表面羟基；磁性聚丙烯酸甲酯颗粒通过乙二胺或1，6己二胺的胺解反应可以得到表面氨基，继而与一氯乙酸反应可以引入亚胺二乙酸基团。

The conversion of acetic acid and the selectivity of propylene reached 85.43% and 98.52%, respectively.

本文还对乙酸与丙烯直接酯化合成乙酸异丙酯的动力学进行了研究。

And Cucumis sativus L. were tested by bioassay-guided separation. The extracts from P. tomentosa flower with ethanol were extracted with petroleum ether, ethyl acetate and n-butanol. The inhibition rate of the ethyl acetate extract to growth of the 3 kinds of plant radicel were 99.89%, 63.53% and 32.74% respectively at 0.5 mg/mL concentration, and that of petroleum ether were 76.30%, 56.17% and 23.36%.

绒叶泡桐Paulownia tomentosa花乙醇提取物依次用石油醚、乙酸乙酯、正丁醇和水萃取后进行活性测定，结果表明，石油醚萃取物在浓度为0.5mg/mL时，对反枝苋、生菜和黄瓜种子胚根生长的抑制率分别为76.30%、56.17%和23.36%；乙酸乙酯萃取物在浓度为0.5mg/mL时，对反枝苋、生菜和黄瓜种子胚根生长的抑制率分别为99.89%、63.53%和32.74%。

The tumors' diameter were determined and the cases of the renascent tumors were counted in each group.

结论高浓度的乙酸对兔VX2肝肿瘤的灭活效果显著；其中100%的乙酸效果最佳。

Objective: To investigate the effection of ethyl acetate extract of sappanwood on T lymphocyte subset to discuss the resist function and possible mechan.

目的：通过观察苏木乙酸乙酯提取物对小鼠T细胞亚群的影响，探讨苏木乙酸乙酯提取物的免疫抑制作用机制。

The experimental results showed that in the acid condition the polymerization rate decreased in acetic acid media, and the contents of species Sia and Sib were increased.

实验表明：在酸性氛围下，当有乙酸化合物存在时，聚硅酸溶液中的硅酸组分与钼酸反应的速率总是要比不含乙酸时的大得多；溶液中存在的Sia和Sib形态均表现出不同程度的增加。

The reaction processes of preparing sodium diacetate from acetic acid and sodium carbonate are studied.

本文对乙酸—纯碱法制备双乙酸钠反应过程进行了研究。

The results indicated that they all had certain effect, but potassium sorbate and sodium diacetate were better than others.

结果表明，山梨酸钾、苯甲酸钠、丙酸钠、丙酸钙和双乙酸钠对湿米粉都有一定的保鲜效果，其中山梨酸钾和双乙酸钠保鲜效果较好。

Esterification of terpineol with oxalic acid, chloroacetic acid and trichloroacetic acid by solid superacid MoO3/TiO2 was studied.

研究了MoO3/TiO2固体超强酸催化剂催化松节油与草酸，氯乙酸，三氯乙酸反应的规律。

The best disinfection methods should be selected to achieve tetter water quality in biological stability and DPBs, Chloramination (chlorine to ammonia by 3:1) results less DBPs and AOC formation (HAAs by 90%, THMs by 70%, AOC by 10% respctively).

氯胺消毒在对消毒副产物卤乙酸和三卤甲烷以及 AOC 的影响方面均优于氯消毒，特别是消毒副产物，采用氯氨比3： l 比例时卤乙酸下降约90％，三卤甲烷下降70％，对提高饮用水水质有很好的作用。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。