乙酯

The Rf value of the glucosamine sulfate was 0.36 measured by paper chromatography with the solvent system of pyridine, ethyl acetate, water and glacial acetic acid (5:5:3:1 in volume).

经纸层析鉴定，以吡啶、乙酸乙酯、水和冰醋酸按体积比5：5：3：l组成的溶剂系统进行展层，氨基葡萄糖硫酸盐的Rf值为0.36。

The intermediate 5-amino-1H-pyrazole-4-carboxylic acid ethyl ester prepared in the first part underwent successively hydrazinolysis, condensations with ketene dithioacetals and alkylations to give rise to the dipyrazolyhnethanes.

从第一部分中的中间体5-氨基-1H-吡唑-4-羧酸乙酯开始，经过肼解、与乙烯酮二硫代缩醛的缩合反应和烷基化反应，合成了二吡唑基甲酮类化合物。

The paper introduced that VOCs exhaust gas in packing printing house was treated by FCJ organic gas purification equipment,which is based on adsorption and catalytic combustion principle.

前言包装印刷厂的主要产品为各种塑料薄膜的印刷制品，在产品生产中大量使用彩色油墨和有机稀料，油墨用的稀料主要是甲苯、乙酸乙酯及少量丁酮。

When the heterogeneous catalyst is used in the asymmetric catalytic hydrogenation reaction of ethyl pyruvate under the room temperature and the medium hydrogen pressure, high activity and optical selectivity more than 70 percent are obtained in acetic acid solution, and the heterogeneous catalyst can be repeatedly used for more than 15 times.

本发明提供的催化剂在室温、中等氢压力下用于丙酮酸乙酯的不对称催化氢化反应时在乙酸溶剂中可得到高活性和超过70％的光学选择性，且可以重复使用15次以上。

The corresponding corrected mortalities of adults were 90.541% and 99.324% with 40 and 45μL/L EtF dosage and 12h fumigation under 25℃.

在25℃条件下以40和45μL/L的药剂浓度处理米象成虫12h，其校正死亡率分别为90.541%和99.324%；以30μL/L的浓度在19、25和31℃下处理24h，校正死亡率分别为83.108%、62%和42%，表明甲酸乙酯具有良好的速效性，且在相对低温时比在相对高温时熏蒸效果好。

The effects of isopropanol concentration in the mobile phase on the retention and resolution were investigated.

用正相高效液相色谱法在该固定相上首次直接拆分了触杀型苗后除草剂氯氟草醚乙酯对映体。

The followingsolvents will be used to analyze the ferrocene

将会用到以下的溶剂来分析二茂铁的产物：(1)己烷*和(2)乙酸乙酯

The measurement of ethyl carbamate content in grape wine by liquid-liquid extraction combined with GC/MS internal standard method had been developed.

建立了液/液萃取结合GC/MS内标法测定葡萄酒中氨基甲酸乙酯含量的方法。

Ethyl carbamate,a known genotoxic compound,is mainly found as a natural trace constituent in wine and other alcoholic beverages.

氨基甲酸乙酯(Ethyl Carbamate，EC)是一种基因致癌物，葡萄酒及其它酒精饮料中含有微量的EC。

METHODS: Rats in each group were anesthetized with intraperitoneal injection of ethyl carbamate at dosage of 1mg/kg; then in intestinal IR group and shenfu injection group rats' superior mesenteric artery was occluded with vascular clamp for 1 hour before 2-hour reperfusion,which was not conducted in blank control group.

各组大鼠给予氨基甲酸乙酯1 mg/kg腹腔注射麻醉，肠缺血再灌注组和参附注射液组用血管钳夹闭肠系膜上动脉1 h然后再灌注2 h，空白对照组不用血管钳夹闭肠系膜上动脉。

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。