醚

Solvent extraction using crown compounds as extractants is one of the most important separation methods of cesium.

用冠醚化合物作为萃取剂从酸性废液中溶剂萃铯，是目前众多分离手段中最重要的方法之一。

Our reaserch lay a solid of theoretical and experimental foundation in exploring our characteristical national new drugs.And it provides the basis of pharmacodynamics for improving clinical standard of 77 version Pharmacopoeia

课题首次确定了蜘蛛香治疗IBS的有效部位为环烯醚萜类成分，并对其作用机制从神经递质，胃肠激素及免疫系统等不同方面进行了研究，为发掘具有我国民族特色的药用资源，深入探讨其物质基础和作用机理提供了科学依据。

The results of our research showed that the chinaberry seed oil, two emulsion formulations of crude toosendanin, Margosan-O, azadirachtin, AZT(NR-2), AZAL-S, petrolem ether extract of the leaf of Tagetes erecta, methyl extract of the root of Tagetes erecta, methyl extract of the whole plant of Bidens pilosa, the oil of Ageratum conyazoides and polygodial had potent toxicity to the larvae of Anopheles sinensis, Culex quinquefasciatus and Aedes albopitus.

中华按蚊Anopheles sinensis、致倦库蚊Culex quinquefa-sciatus和白纹伊蚊Aedes albopictus都是我国重要的传病蚊种。本研究首次证实下列植物的提取物对上述三种蚊虫有毒杀作用：(1)苦楝：苦楝油；(2)川楝：川楝素乳剂、蔬果净；(3)印楝：Margosan-O、印楝素、AZT(NR-2)、AZAL-S；(4)万寿菊：叶石油醚提取物、根甲醇提取物；(5)三叶鬼针草：整株植物甲醇提取物；(6)百花草：精油；(7)水蓼：Polygodial。

The research aimed to study the chemical constituents from Swertia chirata extracted with petrolelum ether.

［目的］研究印度獐牙菜石油醚部位化学成分。

S. chirata ethanol-extracts was extracted with petrolelum ether, ethyl acetate and butanol, respectively.

方法］分别用石油醚、乙酸乙酯和正丁醇萃取印度獐芽菜乙醇浸膏，所得产物用硅胶柱、Sephadex LH-20柱洗脱后进行结构鉴定。

Chirata, and they were identified as β-sitosterol and swerchirin by spectral method. These two compounds were got firstly from the petrolelum ether fraction of S. chirata.

结论］2种化合物β-谷甾醇与1，8-二羟基-3，5二甲氧基山酮均为首次从印度獐芽菜乙醇提取物的石油醚部位分离得到。

Objective To investigate the chemical constituents of the petroleum and the chloroform extracts of Ledum palustre L.

目的对细叶杜香石油醚和三氯甲烷部位的化学成分进行研究。

The effects of post cure temperature and time on the basic properties and compression set of chlorohydrin rubberwere studied in this paper.

研究了二段硫化条件对均聚氯醚橡胶基本性能和压缩永久变形性能的影响。

At present , JHCC has two sets of PO , PGG serges production plants in which globally advanced chlorohydrin process technologe has been used .

锦化现有两套环氧丙烷、聚醚生产装置，均采用世界先进的氯醇法技术。

The side-chain liquid crystal polymacrylate was synthesized by free radical polymerization form the acrylate monomer which was generated from p-hydroxy benzoic acid, ethylene chlorohydrin and acrylic acid by etherification, esterification and chloration.

以对羟基苯甲酸、氯乙醇和丙烯酸为主要原料，经醚化、酯化和酰氯化反应合成了中间体和含液晶基元的丙烯酸酯单体，后者经自由基聚合合成了聚丙烯酸酯侧链液晶聚合物。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。