乙酯

In clinical. acetylcholinesterase inhibitors reduce the breakdown of synaptic acetylcholine, have been modestly effective in improving the cognitive deficits of Alzheimer's disease.The goal of this work is to determine enzyme kinetics and mechanisms of acetylcholinesterase and butyrlcholinesterase inhibition by five cardiovascular drugs, lovastatin, simvastatin, amlodipine besylate, nifedipine, and hydralazine hydrochloride, and two benzodiazepines, diazepam and chlordiazepoxide hydrochloride. All drugs in this study are reversible mixed-type inhibitors of acetylcholinesterase and butyrylcholinesterase. The pKi values for acetylcholinesterase and butyrylcholinesterase inhibition by the cardiovascular drugs are linearly correlated with the molecular weights of the drugs with the slopes of 0.005 and 0.0021, respectively. Therefore, van der Waals' interactions between acetylcholinesterase and the cardiovascular drugs are stronger than those between butyrylcholinesterase and the drugs. This is probably due to a smaller active site gorge and a more significant peripheral anionic substrate binding site of acetylcholinesterase than those of butyrylcholinesterase.

本研究之目的系决定乙醯胆碱酯酵素和丁醯胆碱酯酵素被五种心脏血管药物lovastatin， simvastatin， amlodipine besylate， nifedipine、hydralazine hydrochloride和两种benzodiazepines：diazepam和Chlordiazepoxide hydrochloride的抑制作用之动力学及机转，这些药物都是乙醯胆碱酯酵素和丁醯胆碱酯酵素的可逆性、混合型之抑制剂，实验结果显示，五种心血管药物对於乙醯胆碱酯酵素及丁醯胆碱酯酵素抑制之pKi值和药物之分子量呈直线之关系，斜率分别为0.005及0.0021因此丁醯胆碱酯酵素，与心血管药物间之凡德瓦作用（van der Waals' ）比乙醯胆碱酯酵素与心血管药物间者弱，这可能原因是丁醯胆碱酯酵素之活性区域比乙醯胆碱酯酵素之活性区域更宽广，但丁醯胆碱酯酵素之周边阴离子区域不及乙醯胆碱酯酵素之周边阴离子区域者明显重要，由於五种心血管药物对於乙醯胆碱酯酵素和丁醯胆碱酯酵素抑制之pKi值存在著线性关系表示此种抑制作用系经过共同之反应机理。

Fine chemicals to add auxiliary Series: lubricating oil pour point depressant, calcium zinc magnesium methacrylate, methyl acrylic acid lauryl ester, tetradecane methacrylate ester, methacrylic acid octadecyl ester, a acid ethylene glycol, diethylene glycol methacrylic acid ester, glycidyl methacrylate, the second reduction of three ethylene glycol dimethyl acrylate, acrylic acid lauryl ester, tetradecyl acrylate, octadecyl acrylate, acrylic acid ethylene glycol, diethylene glycol acrylate esters, glycidyl, two shrink three acrylate such as ethylene glycol.

精细化工添加助剂系列：润滑油降凝剂，甲基丙烯酸钙锌镁，甲基丙烯酸月桂酯，甲基丙烯酸十四烷酯，甲基丙烯酸十八烷基酯，甲基丙烯酸乙二醇，甲基丙烯酸二乙二醇酯，甲基丙烯酸缩水甘油酯，二缩三乙二醇二甲基丙烯酸酯，丙烯酸月桂酯，丙烯酸十四酯，丙烯酸十八酯，丙烯酸乙二醇，丙烯酸二乙二醇酯，丙烯酸缩水甘油酯，二缩三乙二醇丙烯酸酯等。

In metabolizing argine, there had no obvious difference among three strains and the control 3 1 DH. Thus, three selected strains had better characters of degrading argininc that they couldn"t over-degrade arginine to produce large numbers" precursors of carcinogenic ethyl carbamate as citrulline, etc.

分析表明，精氨酸分解代谢方面，三个菌株与对照31DH没有明显差异，由此说明，三个优选菌株精氨酸代谢特性良好，不会过多降解精氨酸、代谢产生瓜氨酸等前体物质，从而不会导致致癌物质——氨基甲酸乙酯的大量合成。

At 80℃, the yield of esterification of benzoic acid with ethanol could reach 95% by using 10% catalyst for 6 h; the conversion of toluene in the nitration with 1 equiv. of 65% nitric acid could be achieved to 99% by using 5% catalyst for 5 h.

在80℃下，摩尔分数为10%的Yb(NTf2)3负载催化剂，反应6h可使苯甲酸乙酯的产率达95%；摩尔分数为5%的Yb(NTf2)3负载催化剂，反应5h可使甲苯与等摩尔质量分数为65%硝酸的硝化反应转化率达99%。

The reaction was stirred for the given time (the reaction was followed by TLC) after which the methanol was removed and the residual ionic liquid was extracted with diethyl ether (3 15 mL).

反应搅拌为在给定的时间（反应，其次是薄层色谱法）后，其中甲醇被删除，剩余的离子液体中提取二乙酯基醚。

Content determination of Cholic acid of Sanchenwan pill using Scanning method of thin layer.

用薄层扫描法测定胆酸的含量。选用硅酸G薄层板，展开剂为正己烷∶乙酸乙酯∶醋酸∶甲酸(6∶3 2∶1∶1)；测定波长：62 0nm 。试验表明，本法线性关系良好(r =0 。9984)，平均回收率为 98.2 7%，RSD =2 。1%，方法简便、准确、重现性

The compositions of ethyl acetate fraction, normal butyl alcohol fraction, and water fraction differed significantly.

通过GC-MS和HPLC分析，黑米抗氧化提取物的石油醚部和氯仿部成分以脂肪酸为主，乙酸乙酯部、正丁醇部和水部之间成分构成差异较大。

It's a quick-drying, zinc phosphate primer, based on long oil alkyd resin and urethane alkyd resin.

长油醇酸树脂和氨基甲酸乙酯醇酸树脂配制而成的快干磷酸锌底漆。

MaterialsMethylmethacrylate, ethyl acrylate, acrylic acid and methacrylic acid (all A.R. grades, FirstChemical Reagent Factory, Tianjin, China) were puried bydistillation under reduced pressure and kept in therefrigerator.

物料甲基丙烯酸甲酯，丙烯酸乙酯，丙烯酸和甲基丙烯酸（所有机场铁路等级，第一化工试剂厂，天津，中国）的纯化减压蒸馏和留在refrigerator。

Absorption kinetic curves for two mixed solvent/polyurethane membrane systems (ethanol-1, 2-dichloroethane/PU and ethanol-ethyl acetate/PU) are measured, the replacement is observed in experiment. Dual mode theory combining Henry's law and B.

系统地测定了乙醇-乙酸乙酯和乙醇-1.2-二氯乙烷混合溶剂在聚氨酯膜中的吸收动力学曲线，发现了乙醇对膜内1，2-二氯乙烷的顶替现象，并运用亨利定律+B.E.T。

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。