乙酯

The constituents were extracted by some solvents. 18 constituents were isolated from Chloroform fraction by different chromatography. 15 constituents were identified by IR ,MS and NMR as follows: 3-sitosterol, P-sitosterylpalm itate,succinate acids, 1, 4-benzenediol, 1, 2-benzenediol, p-hydroxybenzaldehyde, syringaresinol, oleanolic acid, usolic acid, ethyl caffeate , Rosmarinic acid ethylster and etc. In such constituents ,nine compounds were isolated for first time from Origanum vulgare L..

牛至药材经水煮醇沉法所得浸膏，利用溶剂法和色谱法从中分离得到18个单体成分，通过IR、MS、NMR等波谱技术鉴定了其中的15个化合物，分别为β-谷甾醇(1)、β-胡萝卜苷(2)、琥珀酸(3)、对-二苯酚(4)、邻-二苯酚(5)、对羟基苯甲醛(6)、1.2-二羟基-4-异丙基-5-甲基苯(7)、新木脂素(8)、丁香脂素(9)、齐墩果酸(10)、乌苏酸(11)、4-二十六烯(12)、正二十六醇(13)、咖啡酸乙酯(14)、迷迭香酸乙酯(15)等，其中化合物3、4、5、6、7、8、9、14、15等9种化合物均为首次从该属植物中分离得到。

The main contribution of this paper is summarized as follow:1 Copolymer acrylate resin including hydroxyl, carboxylic and amina(-NH_2) is a new type of antifogging system and ahydrophi- lic antifogging constituents which is not found before.2 Water-soluble acrylate resin hydrophilic antifogging coating material is a new-type environmental protection material which takes ethanol as solvent and whose pastiness is adjusted by deionized water.3 The quality rate of accessory soft monomer ethyl acrylate and accessory hard monomer butyl methacrylate is 6 to 4, the quality rate of functional monomers in all monomers is 20 percent, the quality rate of MAA in the functional monomers is 22 percent, the quality rate of β-hydroxyl ethyl acrylate in the functional monomers is 8 to 10 percent and the remainder of functional monomer is acrylic acid.4 Cross-linking agent methylol acrylamide belongs to self-cross-linking system.

本文的主要贡献概述如下： 1 含有亲水羧基、羟基和氨基(-NH_2)丙烯酸共聚树脂是一种新型高效的防雾体系，用的亲水防雾组分是前所未有的。 2 以乙醇为溶剂制得水溶性丙烯酸树脂具有很好的水溶性能和防雾性能，只需加入去离子水就可以调节它的粘度，是一种新型的环保型防雾材料。 3 辅助软单体丙烯酸乙酯和辅助硬单体甲基丙烯酸甲酯最佳配比为质量比6∶4；官能单体占单体总量的20%，甲基丙烯酸占官能单体总量10～15%，甲基丙烯酸β-羟乙酯占官能单体总量的8～10%，剩下的为丙烯酸。

As the second part of a series of studies on the synthesis of 2-phenoxyisobutyric acid ethyl ester by tri-liquid-phase catalysis, this work examines the factors affecting the reaction between 2-bromoisobutyric acid ethyl ester and sodium phenolate with tetra-n-butylammonium bromide as a phasetransfer catalyst.

本文为以三液相催化技术合成2-苯气基异丁酸乙酯之研究系列的第二部份，主要在探讨各变因对以溴化正四丁基铵为相间转移触媒，催化2-溴异丁酸乙酯与酚化钠（NaOPh，水相亲核试剂）反应的影响。

It is found that the corrosion inhibition rates come to 91.55% when the proportion of imidazoline and diethyl phosphite is 2:1, which meets the requirements of corrosion inhibition.

经过对咪唑啉和亚磷酸二乙酯这两种环烷酸缓蚀剂在不同配比下复配的评价，得出：在咪唑啉和亚磷酸二乙酯2：1配比时，缓蚀速率为91.55%，达到缓蚀的要求。

The test showed that the vegetable oil was better for plasticization of polystyrene.

结果 表明植物油对聚苯乙烯具有良好的增塑性，采用乙酸乙酯、乙酸乙酯和甲苯两种体系的溶剂进行溶解制备包膜肥料，除A1外，其他5种肥料初期溶出率均低于40%，可以确认用此两种体系溶剂溶解聚苯乙烯皆可行，混合溶剂体系的效果更好些。

Results Eleven compounds were isolated and identified as:quercetin(1),kaempferol(2),quercitrin(3),protocatechuic acid(4),gallic acid(5),protocatechuic acid ethyl ester(6),ethyl gallate(7),vanillic acid(8),1,5,7-trihydroxyl-3methylan...

结果得到11个化合物，分别鉴定为：槲皮素(1)、山柰酚(2)、槲皮苷(3)、原儿茶酸(4)、没食子酸(5)、原儿茶酸乙酯(6)、没食子酸乙酯(7)、香草酸(8)、1，5，7-三羟基-3-甲基蒽醌(9)、琥珀酸(10)、5-羟甲基糠醛(11)。结论化合物6、7、9、11为首次从该属植物中分离得到。

And Cucumis sativus L. were tested by bioassay-guided separation. The extracts from P. tomentosa flower with ethanol were extracted with petroleum ether, ethyl acetate and n-butanol. The inhibition rate of the ethyl acetate extract to growth of the 3 kinds of plant radicel were 99.89%, 63.53% and 32.74% respectively at 0.5 mg/mL concentration, and that of petroleum ether were 76.30%, 56.17% and 23.36%.

绒叶泡桐Paulownia tomentosa花乙醇提取物依次用石油醚、乙酸乙酯、正丁醇和水萃取后进行活性测定，结果表明，石油醚萃取物在浓度为0.5mg/mL时，对反枝苋、生菜和黄瓜种子胚根生长的抑制率分别为76.30%、56.17%和23.36%；乙酸乙酯萃取物在浓度为0.5mg/mL时，对反枝苋、生菜和黄瓜种子胚根生长的抑制率分别为99.89%、63.53%和32.74%。

Objective: To investigate the effection of ethyl acetate extract of sappanwood on T lymphocyte subset to discuss the resist function and possible mechan.

目的：通过观察苏木乙酸乙酯提取物对小鼠T细胞亚群的影响，探讨苏木乙酸乙酯提取物的免疫抑制作用机制。

Ethyl dicyanopropionate was synthesized by one-step reaction with sodium cyanide, paraformaldehyde and ethyl cyanoacetate in solvent.

由氰化钠、多聚甲醛和氰乙酸乙酯在溶剂中反应，一步合成二氰基丙酸乙酯，收率达80.2%，含量90.8

Keywords infrared spectrophotometry;stigmasterol acetate;β sitosterol acetate;quantitative analysis

红外分光光度法；豆甾醇乙酯；β-谷甾醇乙酯；定量分析

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。