乙酸

Serotonin (5-HT), its precursors tryptophan and 5-hydroxytryptophan (5-HTP), major metabolites 5-hydroxyindoleacetic acid (5-HIAA); and 3-methoxy-4- hydroxyphenylethylene glycol , homovanillic acid , the respective major metabolites of noradrenaline and dopamine were measured by a method of HPLC.

应用高效液相色谱法测定其中5—羟色胺（5-HT）系列代谢物：色氨酸、5-羟色胺酸（5-HTP）、5-HT、5-羟吲哚乙酸（5-HIAA）；多巴胺的主要代谢产物3-甲氧基-4-羟基苯乙酸；去甲肾上腺素的主要代谢产物3-甲氧基-4-羟基苯乙二醇等。

A method for the determination of Acetic acid and Hydrobromic acid in air and environmental sample by ion-chromatography is described.

用同一吸收液采集、离子色谱法测定空气中的乙酸和溴化氢，采样体积为60L时，乙酸和溴化氢的检出限分别为0.03mg/m3和0.11mg/m3，相对标准偏差分别为1.9%和1.7%，实际样品的加标回收率分别为90.1%~102%和

It showed that the yield of hydroxyacetic acid reached above 99.5%, the extracting efficiency was over 97%,and the product with purity of more than 96% was obtained. Extractant and solvent also can be reused.

实验结果表明：羟基乙酸合成的反应产率达99.5%以上，羟基乙酸萃取率达97%以上，最终收率达96%，萃取剂与溶剂均可循环使用。

Hydroxyacetic acid was synthesized by glycolonitrile in the presence of H2SO4 , and it was separated by applying extraction based on chemical complexation and solvent method.

以羟基乙腈为原料，在酸性条件下水解合成羟基乙酸，并采用络合萃取法和溶剂溶解法分离羟基乙酸。

Those biodegradable materials finally form into CO2 and H2O via culture of tricarboxylic acid cycle, which can be excreted from lung, kidney, and skin. Hydroxyacetic acid is a metabolic product of amino acids. Therefore, velocity of bioldegradable materials can be controlled in vivo. The recent contraception focuses on discover a sustained release system of biodegradable materials.

生物可降解材料包括聚乳酸、聚ε-己内酯、乳酸-羟基乙酸共聚物等，这些材料有很好的生物相容性，植入体内后可经生物降解成乳酸单体，经三羧酸循环后最终成为CO2和H2O，经肺、肾、皮肤排泄，羟基乙酸也是机体氨基酸代谢产物，而且生物可将解材料在体内降解速度是可控的，用生物降解聚合物作为药物载体的缓释避孕系统是目前材料学以及避孕节育研究的一大重点。

The optimum reaction conditions of the synthesis of isoamyl acetate with Nafion NR50 resin membrane as catalyst were studied.

以全氟磺酸树脂膜为催化剂得到冰乙酸和异戊醇反应合成乙酸异戊酣适宜的反应条件。

Isoamyl acetate was synthesized with acetic acid and isopentyl alcohol by using Ca(p-CH3C6H4SO3) 2 as catalyst.

以乙酸和异戊醇为原料、对甲苯磺酸钙为酯化催化剂合成乙酸异戊酯，研究影响酯化率的因素。

The synthesis of isoamyl acetate with the solid super acidic catalyst of S2O827TiO2-Al203 is investigated. The kinetic parameters of reaction are measured at 94℃, 100℃ and 106℃ respectively and the kinetic equation is thus built, which are compared with those of the reaction without catalyst.

文章研究了以固体超强酸S2O82-/TiO2-Al2O3为催化剂合成乙酸异戊酯的反应，在反应温度分别为94℃、100℃及106℃下，测出合成乙酸异戊酯的动力学方程参数，建立了动力学方程式，并与无催化剂时酯化反应的活化能及动力学方程式进行了比较。

The synthesis of isoamyl acetate with the solid super acidic catalyst of S2O82-/TiO2-Al2O3 is investigated.The kinetic parameters of reaction are measured at 94℃,100℃ and 106℃ respectively and the kinetic equation is thus built,which are compared with those of the reaction without catalyst.

文章研究了以固体超强酸S2O82-/TiO2-Al2O3为催化剂合成乙酸异戊酯的反应，在反应温度分别为94℃﹑100℃及106℃下，测出合成乙酸异戊酯的动力学方程参数，建立了动力学方程式，并与无催化剂时酯化反应的活化能及动力学方程式进行了比较。

Thirdly, on the basis of the optimal reaction conditions of synthesis of borneolacetate, using borneol 、 isoborneol, acetic acid, propionate、 butyrate and isobutyric acid as the starting material and nanometer solid superacid (S_2O_8)~(2-)/ZrO_2 or (SO_4)~(2-)/ZrO_2-La_2O_3 as the catalyst ,a series of compounds ( borneol ester and isoborneol ester ) which had six new compounds were prepared.

以合成乙酸冰片酯的最佳反应条件为基准，采用纳米固体超强酸S_2O_8~(2-)/ZrO_2或SO_4~(2-)/ZrO_2-La_2O_3为催化剂，以冰片、异冰片、乙酸、丙酸、丁酸、异丁酸为原料，合成了系列正、异冰片酯(其中6个末见文献报道)。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。