查询词典 acetic

The Perkin method for coumarin synthesis from salicylaldehyde and acetic anhydri de has been improved by using calcium acetate as catalyst and polyethylene glycol as activator.

摘 要 对以水杨醛和乙酸酐为原料合成香豆素的工艺进行了改进。采用乙酸钙为催化剂、PEG为活化剂的工艺路线。

The results show that the resulting product can be separated by the mixture of petroleum ether, aether and acetic acid (10:10:1, V/V). Among them, the oleic acid component can be eluted by the mixed solvent of ethanol and carbon tetrachloride (35:15, V/V), and then productivity of sodium oleoyl sarcosine can be obtained.

结果表明：用石油醚：无水乙醚：冰乙酸＝10：10：1分离产物中的组分，再用无水乙醇：四氯化碳＝35：15混合溶剂洗脱制备油酸组分，进而计算油酰肌氨酸钠的产率是可行的。

To the separatory funnel zhongjia acetic acid (4%) to-amoxycillin.

向各分液漏斗中加乙酸(4%)至10mL。

Objective:To investigate the antinociceptive effect of BTX-A and its influence on the serumal TNFin an acetic acid-induced visceral pain model in rats.

目的：探讨A型肉毒素在大鼠化学性内脏损伤中的止痛作用及对血清肿瘤坏死因子的影响。

Injection of BTX-A intraperitoneally significantly reduces acetic acid-induced nociceptive behaviors after 1 week and 4 weeks, decreases the level of serumal TNF.

腹腔注射BTX-A能缓解乙酸所致的大鼠内脏损伤的疼痛行为学反应，减少血清TNF释放，BTX-A可能通过减少血清TNF释放，减轻炎性反应，减少疼痛刺激。

The methods for acetic acid bacteria preservation,including slant pre servation,liquid wax preservation and liquid preservation,were compared with t he modified slant-suspension preservation experiments on preservation duration and acid yield were also studied in this paper.

对醋酸菌保藏的斜面保藏法、液体石蜡保藏法、液体保藏法和经过改进的斜面液体保藏法进行了比较，并进行了保藏期限和产酸能力的实验，结果表明：斜面液体保藏法保藏的菌种保藏期限可达2年，产酸能力优于其它3种方法。

The results show high selectivity when the temperature is controlled at 50 CC , and the nitrated reaction time is 90 mm, toluene is nitrated by using 95% nitric acid as nitrating reagent at the presence of acetic anhydride, 1.0g silicotungstic acid catalyst is calcinated at 300℃ for 1.5h. The o/p (ratio of ortho to paro isomer of toluene nitration) ratio is 0.89 in product distribution of toluene nitration, lower than 1.67 using sulfonitric acid as catalyst. The yield of products is 91.6%.

结果表明，在醋酐存在条件下，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，反应温度控制在50℃，反应60 min， 1.0g经300℃焙烧1.5h后的硅钨酸催化剂，对甲苯表现出强的区城选择性，甲苯硝化产物o/p值（甲苯硝化产物邻位和对位异构体的质量比）达0.89，较硝硫混酸的1.67显著降低，产物收率达到91.6%。

Using silicotungstic acid as catalyst with the catalyst supported on active carbon,2-methyl-2-ethyl-acetic-1,3-oxathiolane(targeted compound I,an aroma compound with apple flavor )was synthesized by the reaction of ethyl aceto-acetate and 2-mercapto-ethanol.

以活性炭固载硅钨酸作为催化剂，用乙酰乙酸乙酯与巯基乙醇缩和合成了具有浓郁苹果香气的香料化合物2-甲基-2-乙酸乙酯基-1，3-氧硫杂环戊烷。

Acid is formed under acidic conditions, it has antibiotic action, weaker than sorbic acid and stronger than acetic acid.

在酸性条件下产生丙酸，具有抗菌作用，比山梨酸弱，比乙酸强。

Methods: The various animal models including writhing experiment in mice, rat's toes swelling induced by carrageenan and the increase of capillary permeability in mice induced by acetic acid, were used to determine the effects of compound sparganium stoloniferum capsules.

建立多种动物模型，通过对醋酸所致小鼠扭体反应、角叉菜胶所致大鼠足肿胀、醋酸所致小鼠腹腔毛细血管通透性影响等试验，研究复方三棱胶囊的药理和毒理作用。

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。