查询词典 acetic

Methods: fudr was esterified with acetic anhydride in the presence of pyridine and 4 dimethylaminopyridine.

在吡啶和4 二甲氨基吡啶存在时，fudr与乙酸酐反应，制备氟尿苷二乙酸酯，并测定其核磁共振氢谱。rp hplc测定其在正辛醇和磷酸盐缓冲液中的分配系数及不同ph缓冲液和组织匀浆中的稳定性。

Acetylated starches with high degree of substitution were synthesized from cornstarch with acetic anhydride as esterifying agent and methanesulphonic acid as catalyst.

以玉米淀粉为原料，醋酸酐为酯化剂，甲烷磺酸为催化剂，制备高取代度淀粉醋酸酯。

Methods: 2ethyl aniline was used as starting material of the synthesis and was processed by acetic anhydride acylation, strong nitric acid nitraction at low temperature, and desacyl synthesis to produce 2ethyl5nitro aniline. The product was then synthesized to 3methyl6nitro1Hindazole by using ringclosing reaction in the presence of NaNO2, and then ethylated to obtain 2,3diethyl6 nitro2Hindazole. The latter compound was then reduced by SnCl2/Hcl to get target compound 2,3diethyl6nitro2Hindazole.

以2乙基苯胺为原料经醋酐酰化、浓硝酸低温硝化及去酰基保护合成2乙基5硝基苯胺，后用亚硝酸钠关环得3甲基6硝基1H吲唑，经硫酸二甲酯甲基化得2，3二甲基6硝基2H吲唑，最后用氯化亚锡将其还原得到目标产物，通过1H NMR确定结构与目标产物一致。

Methods: 2-ethyl aniline was used as starting material of the synthesis and was processed by acetic anhydride acylation, strong nitric acid nitraction at low temperature, and desacyl synthesis to produce 2-ethyl-5-nitro aniline. The product was then synthesized to 3-methyl-6-nitro-lH-indazole by using ring-closing reaction in the presence of NaNO2, and then ethylated to obtain 2, 3-diethyl-6- nitro-2H-indazole. The latter compound was then reduced by SnC12/Hcl to get target compound 2, 3-diethyl-6-nitro-2H-indazole.

以2-乙基苯胺为原料经醋酐酰化、浓硝酸低温硝化及去酰基保护合成2-乙基－5-硝基苯胺，后用亚硝酸钠关环得3-甲基－6-硝基－1H-吲唑，经硫酸二甲酯甲基化得2，3-二甲基－6-硝基－2H-吲唑，最后用氯化亚锡将其还原得到目标产物，通过1HNMR确定结构与目标产物一致。

An enzyme found chiefly at nerve terminals that inactivates acetylcholine by hydrolyzing it to form acetic acid and ''.

乙酰胆碱酯酶一种主要分布于神经末梢的酶，它能通过水解乙酰胆碱形成醋酸和胆碱从而使之失去活性

An enzyme found chiefly at nerve terminals that inactivates acetylcholine by hydrolyzing it to form acetic acid and choline.

乙酰胆碱酯酶一种主要分布于神经末梢的酶，它能通过水解乙酰胆碱形成醋酸和胆碱从而使之失去活性

METHODS Mice hot-plate, writhing test and mice menalgia model of acute stress blood stasis rat was used to compare therapeutic action of the three preparations RESULTS Both chuanxiong formula granule and decoction pieces standard broth of liquored Chuanxiong formula granule and decoction pieces stand ard broth could prolong pain threshold, extend incubation period caused by acetic acid andoxytocin, reduce writhing frequency, and improve some indexes of hemoreology in acute stress blood stasis rat.

选择热板法、扭体法、痛经模型、急性应激血淤血液流变性等方法，比较川芎配方颗粒及饮片、酒川芎配方颗粒及饮片的主要药理作用。结果川芎配方颗粒与川芎饮片标准汤剂、酒川芎配方颗粒与酒川芎饮片标准汤剂均能延长小鼠热板痛闭值，均能延长醋酸所致扭体反应的小鼠扭体潜伏期并减少扭体次数，均能延长小鼠痛经模型中催产素所致扭体反应的潜伏期并减少扭体次数，均具有改善急性应激血淤大鼠血液流变的作用。

Chintin with chintin film processing is not complicated, first of all the industrial processing of accumulation of crab and shrimp when chintin inmnersion hydrochloride, and a strong base to calcium and protein deposits, you can be assured of semi-finished chintin powder; and then add the acetic acid powder soluble in chintin erjia polyamlnes vlproic bisprone nitrogen and licl mixture, mixed solution evenly onto a glass plate, and lixiviating propylalcohol solution would reflect on the glass panes for the transparent on the film.

用甲壳质加工甲壳薄膜的工艺并不复杂，首先将工业加工蟹虾时积聚的甲壳质用盐酸浸泡，再用强碱使钙和蛋白质沉淀，就可得到半成品的甲壳粉末；然后将甲壳粉末溶于醋酸二甲胺、氮戊环酮和氯化锂混合液中，再将混合溶液均匀地洒在玻璃板上，并在异丙醇溶液中浸一下，玻璃板上便形成了透明的甲壳薄膜。

The HPLC method has been used to investigate the stability of etimicin in 0.9% sodium chloride, 5% glucose, 10% glucose, compound sodium chloride, glucose sodium chloride and so on. In the experiment, the ODS-C18 column (4.6mm×250mm), mobile phase: methanol/water/acetic acid=80/16/4 (containing heptane sulfonic sodium 0.02mol/L), UV detection with wavelength of 330nm were employed. After integrating each of the menstruums with etimicin, the content and pH value were measured after 1h, 2h, 4h, 6h and 8h at a temperature of 17, 25 and 35℃, respectively.

实验采用HPLC法，以C18柱为色谱柱，CH3OH：H2O：HAc=80：16：4（含0.02mol/L庚烷磺酸钠）为流动相，检测波长330nm；对依替米星在生理盐水，5%葡萄糖，10%葡萄糖，复方氯化钠，葡萄糖氯化钠等溶媒中进行了稳定性研究，在室温(17℃)，25℃，35℃情况下，将依替米星与不同的溶媒配伍后，在1h，2h，4h，6h，8h分别测定它们的含量及pH值。

Methods by using a broad pH range column(Gemini NX C18,4.6mm×150mm,5μm),basic mobile phase which was[H_2O-ammonia-glacial acetic acid] (96:3.6:0.4)-methanol,the related substances in etimicinsulfate were separated and detected by electrospray ionization and positive ion monitoring,the ESI ion source condition was following: temperature is 350℃,nebulizing pressure is 50 psi,dry gas flow is 10 L /min.some related substances in etimicinsulfate were identified by comparing the retention time in chromatography,~+ spectrum and MS~2 spectrum with reference substances\',the others which haven\'t reference substances were identified or speculated by analyzing their MS~2 fragmentation with the help of a rule summarized from the MS~2 fragmentation of gentamicin C1a,micronomicin and etimicin.Results nineteen related substances in etimicinsulfate were separated and detected.

方法利用宽pH范围的Gemini NX C18(4.6mm×150mm，5μm)色谱柱，在碱性条件下，以[水-氨水-冰醋酸(96：3.6：0.4)]-甲醇(70：30)为流动相，直接分离各组分；并用HPLC-ESI-MS~2检测样品中各组分，质谱条件：ESI离子源，离子源温度350□，雾化室压力50 psi，干燥气流速10 L/min，正离子检测方式；对有对照品的有关物质采用比对有关物质与对照品的色谱保留时间、准分子离子的质荷比及二级质谱方法进行鉴定，无对照品的有关物质，则是先通过解析庆大霉素Cla、小诺霉素、依替米星的二级质谱，对该类化合物的二级质谱裂解规律进行归纳，并以此推测未知新化合物进行结构，再用推测的结构对二级质谱进行解析，如所有的碎片离子均合理解释，表明推测合理。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。