酯

The results show that the yield of butyl acetate using the catalysts prepared with the concentration of H2SO4 by 0.5 mol·l-1 and the calcination temperature of 550℃ is the best,which is up to 52.5% when the molar ratio of butyl alcohol to acetic acid is 1:1.3 and without addition of entrainer in the hermetic reactor.

结果表明采用硫酸浸渍液浓度为0.5mol/L，焙烧温度为550℃时所制备的催化剂在正丁醇和乙酸的物质的量比为1.3及不添加任何带水剂的密闭条件下酯化效果最好，酯化率为52.5%。

And to getting together craft of synthesis of glycerine tristearin acerbity ester undertakes optimizing, discovery optimizes what obtain after craft to get together the performance of glycerine tristearin acerbity ester is better, hlb value is 8.5 ～ 9.8, exterior tension is 45 ～ 49mn/m, epispastic force is 18 ～ 20mm.

并对聚甘油硬脂酸酯合成工艺进行优化，发现优化工艺后获得的聚甘油硬脂酸酯的性能较好，hlb值为8.5～9.8，表面张力为45～49mn/m，发泡力为18～20mm。

Objective］ The aim of this research was to study the detection method of ester and lactone by spectrophotometry.

［目的］研究酯和内酯的分光光度检测方法。

An ester of glycerol and fatty acids that occurs naturally as ''.

甘油和脂肪酸形成的酯，天然的甘油酯以''。

Objective To obtain pyrethroidhydrolyzing esterase gene and analyze the characteristics of it.

目的 筛选新的菊酯农药降解酶基因并了解其特性，为解决食品和环境中的菊酯农药残留问题创造条件。

Activities of α-naphthylacetate esterase and acetylcholinesterase also increased with the increase of Bt protoxin concentration.

羧酸酯酶和乙酰胆碱酯酶的活力也呈升高趋势。

Objective:To study hydrolysis of vitamin E acetate catalyzed by cholesterol esterase in the reversed micelle systems.

研究了有机相脂肪酶催化合成共轭亚油酸β-谷甾醇酯的工艺条件，同时研究了甾醇酯的分离纯化方法。

Starch phosphate is one kind of starch derivative produced from esterification of starch and phosphate.

淀粉磷酸酯是原淀粉与磷酸盐发生酯化反应而生成的一种淀粉衍生物。

This paper has studied the esterification of isopropanon and salicylic acid in the presence of boronic acid.

以硼酸为催化剂合成水杨酸异丙酯，发现硼酸对水杨酸异丙酯的合成具有良好的催化活性。

Mechanical properties and appearance of the film formed by this paint mainly depend on the addition of epoxy ester and priming paint of iron oxide red, as well as the esterization temperature.

研究发现底漆涂膜的力学性能和外观由合成环氧酯的配比、酯化温度以及铁红底漆配比所决定。

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。