乙酸的

The further research will enrich the theory and practice of green C1 chemistry and performance of thermodynamically unfavo-rable reactions.

该工艺为乙酸合成和CH4与CO2的绿色化学利用开辟了新途径，其研究将会丰富C1化学化工的理论与实践，并为实现热力学不利反应提供实验方法和理论依据。

On the condition of the existence of the buffer solution of ammonium acetate (PH5-6) and ammonium thiocyanate, quantitatively reduce Cu2+ into Cu+ by using sodium thiosulphate .

本文在PH5-6的乙酸铵缓冲溶液及硫氰酸铵存在下，用硫代硫酸钠定量还原Cu~(2+)为Cu~+，Cu~+与SCN~-结合，形成稳定的硫氰酸亚铜白色沉淀，反应终点可由全自动电位滴定仪确定。

Aspartic acid An AMINO ACID formed by transamination, in which the amino group of dlutamic acid is transferred to oxaloacetic acid.

天冬氨酸：由转氨基作用形成的一种氨基酸，谷氨酸的氨基基团被转移到草酰乙酸中。

When components of fermentation medium were glucose 20 gL^(-1), yeast extract powder 25 gL^(-1), MgSO4.7H2O 0.38 gL^(-1), L-aminothiopropionic acid 1 gL^(-1), Triammonium cetrate 2 gL^(-1), sodium acetate 2.5 gL^(-1) and tween 80 1 mlL^(-1), the production of bacteriocin reached the maximum and the diameter of bacteriostasis circle was 28.97 mm.

当培养基的组成为：葡萄糖20 gL^(-1)，酵母浸粉25 gL^(-1)，MgSO4.7H2O 0.38 gL^(-1)，L-半胱氨酸1 gL^(-1)，柠檬酸三铵2 gL^(-1)，乙酸钠2.5 gL^(-1)，吐温80 1 mlL^(-1)时细菌素的产量最大，抑菌圈直径可达28.97 mm。

This reflected that EMP and HMP pathways and the tricarboxylic acid cycle were very important to the bioreduction.

表明糖酵解途径、磷酸戊糖途径和三羧酸循环的顺利进行对于面包酵母在有机介质中催化4-氯乙酰乙酸乙酯还原反应都是十分重要的。

BCA method conjugated with trichloroacetic acid is adaptable to the rapid and sensitive determination of protein in powdered milk.

结合三氯乙酸沉淀的BCA法适用于奶粉中蛋白质的快速检验和掺伪检验。

Cryosurgery and laser evaporation are common therapy for SK. Recently, some new treatment strategies have been developed for it, including topical trichloroacetic acid, systemic acitretin, and so on.

脂溢性角化病的治疗以冷冻、激光为主，但近年来也出现一些新的疗法，如局部外用三氯乙酸，系统应用阿维A等。

Methods Conjugated with protein precipitation with trichloroacetic acid, BCA method was used.

使用三氯乙酸沉淀蛋白质后，运用BCA法，在570 nm波长处，分别测定标准蛋白质应用液与样品稀释液的吸光度值，基于测定液中蛋白质含量与其吸光度值呈正比关系，计算出样品中蛋白质的含量。

In chapter 3, 83 volatile chemical constituents have been identified from the petroleum ether extracted part of ethanol extract of Debregeasia longifolia Wedd., and the relative percentages of the compounds are determined by GC method. From the extract of trichloromethane and ethyl acetate, 8 compounds have been isolated.

第三章首次对长叶水麻乙醇提取物的石油醚萃取部分分离并鉴定出83种成分，并用毛细管气相色谱面积归一化法测定了各组分的相对百分含量；从氯仿和乙酸乙酯萃取部分分离得到了8种化合物，用波谱学方法鉴定了其中2种成分。

Five species of solvents, namely, acetone, ethyl acetate, ether, trichloromethane and petroleum ether were selected to obtain extracts from Portulaca oleracea L. with microwave assistance and the biological activities of each extract was tested against Plutella xylostella L.

在微波加热条件下，以丙酮、乙酸乙酯、乙醚、三氯甲烷和石油醚为溶剂对马齿苋干粉进行提取，试验了各溶剂提取物对小菜蛾幼虫的触杀、胃毒及拒食活性，确定了石油醚提取物触杀作用的LD50。

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。