酯

Long wavelength such as red light did not favour the accumulation of flavoniod and terpene,but promoted the growth of Ginkgo biloba.

结果表明：长波段的光不利于黄酮和内酯类物质的积累而有利于植株的生长；短波段的光不利于生长但有利于黄酮和内酯类物质的积累。

Secondly, preparing terpineol and discussion of its results. It was put up by reaction-temperature, reaction-time, the ratio of catalyst and raw material, the kinds of esterify and dosage, the choice of solvent, catalyst life-span and so on. It was discovered that turpentine transform ratio was 86.29%, the yield ratio of terpineol was 68.89%, the selectivity of solid superacid catalyst was 79.84%.

二，松油醇的制备及结果讨论，从反应温度、时间、物料配比、酯化剂的种类与用量、溶剂的选择、催化剂寿命等几个进行了考察，结果发现反应温度为T3、时间L5小时、酯化剂用F3、物料配比为H3％、溶剂用G等时，松节油的转化率为86.29％、松油醇的收率为68.89％、固体超强酸催化剂的选择性为79.84％。

A photosensitive prepolymer was prepared by the reaction of tetrahydrocannabinol phthalate glycidyl and acrylic acid, and optimized the reaction conditions. The structure of the resin was characterized by FT-IR.

以四氢邻苯二甲酸二缩水甘油酯与丙烯酸反应制备缩水甘油丙烯酸酯，优化了合成反应的条件，并用红外光谱对产物结构进行了表征。

The effect of reagents, reaction temperature, dinitrogen tetroxide and nitric acid on the yield and purity of 1,2-propanediol dinitrate were also investigated.

结果表明，N_2O_5和环氧丙烷硝化的主产物是1，2-丙二醇二硝酸酯，副产物是1，2-丙二醇单硝酸酯。

The results indicated that CHCl3 was optimum reagent and the reaction temperature was better controlled at 10~15℃. Dinitrogen tetraoxide and nitric acidhad a detrimental effect on the yield and purity of 1,2-propanediol dinitrate. When the concentrations of dinitrogen tetroxide and nitric acid were below 1.00% and 5.53% respectively, these detrimental effects could be neglected. Under the optimum conditions, the yields and the purity of 1,2-propanediol dinitrate were 99.01% and 95.89%, respectively.

同时考察了反应溶剂、反应温度、N_2O_5中N_2O_4和HNO_3杂质对1，2-丙二醇二硝酸酯收率和纯度的影响，结果表明，适宜的溶剂是CHCl3；适宜的反应温度为10～15℃；在适宜条件下，1，2-丙二醇二硝酸酯的收率和纯度可分别达到99.01%和95.89%；N_2O_4和HNO_3对产物的收率和纯度均有不利影响，但当N_2O_5中N_2O_4含量小于1.00%，HNO_3含量小于5.53%时，对产物收率和纯度的影响不大。

The present invention discloses a method for separating and extracting polyhydroxy fatty acid ester from bacterial thallus.

本发明公开了一种从细菌菌体内分离提取聚羟基脂肪酸酯的方法，以便能够有效地从细菌菌体内分离提取聚羟基脂肪酸酯。

It is also of value to provide a broad understanding about the modification of other thermo set polymer systems.

通过改性氰酸酯树脂体系的研究，获得具有物理机械性能、介电性能等优良的氰酸酯树脂及其复合材料。

This step produces a thiol ester. In the next step, methanolysis of the thiol ester is carried out in the presence of a basic catalyst.

该步骤产生硫羟酸酯，在下一步中，在碱性催化剂存在下进行硫羟酸酯的甲醇解。

Bromoxynil octanoate was synthesized from bromoxynil, octanoic acid and thionyl chloride in the solvent using DMF and N(C 2H 5) 3 as catalysts by one step reaction.

以DMF、三乙胺为催化剂，在溶剂中，用辛酸直接合成了溴苯腈辛酸酯，实现由酸合成酯的一步反应。

The reactivities of 1 and other long chain oximes with p nitrophenyl diphenyl phosphate, p nitrophenyl diethyl thiophosphate, and O ethyl ( s β diisopropylaminoethyl) methyl phosphonothiolate were studied.

报道了一种新的高亲核长链咪唑肟N 十四烷基咪唑 2 甲醛肟的设计与合成，并比较了它及其他长链咪唑肟与有机磷酸酯二苯基、对硝基苯基磷酸酯、对硫磷及 Vx 的反应活性。

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。