乙酸

Both of the thermophiles were motile by means of lophotrichous flagella and had high growth rate on medium containing cellulose. Optimal growth occured at 60℃ for the two thermophiles and at PH 7. 5 for Y, PH 7. 37. 5 for W strain. Y strain produced yellow pigment in cellulose medium and had yellow-colored, round or watery colonies in cellulose agar. The colonies of W strain were white -colored and similar in form to that of Y strain. The mesophile, Clostridium sp. B, was motile with peritrichous flagella. The colonies grown on cellulose agar were white and round with slightly undulate margins. The optimal growth temperature and PH of B strain were 40℃ and 7. 0-7. 2, respectively. All of the three Clostridia fermented varieties of carbohydrates and in cellulose media produced the similar end-products: CO〓H〓, ethanol and acetic acid. The DNA compositions were 34 mol% for Y and B, 35 mol% for W strain.

嗜热菌y与w在含纤维素的培养基中生长迅速，其最适生长温度均为60℃；最适PHy为7.5，w为7.3-7.5.y菌在纤维素培养基中产生黄色，在纤维素琼脂中菌落为黄色并呈圆形或流动粥样。w菌落为白色，但形状与y菌类似，嗜温菌B在纤维素琼脂上菌落为白色，圆形，边缘呈微小波状，最适PH与温度分别为7.0-7.2和40℃，三支菌都可发酵多种碳水化合物，且在纤维素培养基中产生同样的产物：CO〓H〓，乙醇和乙酸，三者DNA组成分别是y为34mol%，w 35mol%，B 34mol%。

3 Explain why propanoic acid boils at 141℃,but methyl acetate boils at 57℃.

解释为什么丙酸沸点为141℃，而乙酸甲酯沸点为57℃。

This invention publishes a preparation method for methyl acetate and a reaction distillation column with combined trapezoid spray trays.

本发明公开了一种乙酸甲酯的制备方法和具有立体传质塔板的反应精馏塔。

The results showed that the optimal parameters of transesterification reaction were: molar ratio of methyl acetate to oil 14:1, 30% enzyme added based on oil weight, temperature 40℃ and reaction time 14 h.

研究结果表明，最佳酯交换条件为：脂肪酶Novozym 435加入量为棉籽油质量的30%，乙酸甲酯和棉籽油的摩尔比14：1，反应温度40℃，反应时间14 h。

In order to test the validity of this method, the saponification of methyl acetate, ethyl formate and methyl formate in aqueous solution at 25℃ has been studied.

研究了25℃下乙酸甲酯、甲酸乙酯和甲酸甲酯在水溶液中的皂化反应，其计算结果与文献值相吻合，从而验证了热弛豫法的正确性。

We have concluded that the main losing activity reason of SO_4~(2-)/TiO_2-SiO_2 solid superacid catalysts used in synthesis of methyl acetate is the accumulated carbon of catalytic surface and the loss of SO_4~(2-).

3对催化剂的失活机理进行讨论，结果表明用于乙酸甲酯酯化反应的SO_4~(2-)/TiO_2-SiO_2固体超强酸催化剂失活的主要原因是催化剂表面积碳和SO_4~(2-)流失。

To explore the issue, 16 experiments to dissolve microcline have been conducted using different solutions with 2mol/L NaCl, 0.05mol/L acetic acid, 5ml crude oil or 0.05mol/L oxalic acid (the values are close to those measured in Tarim oilfield waters) and different initial pHs and temperatures.

为探讨该问题，实验配制了含2mol/L NaCl 、0.05mol/L 乙酸、5ml 原油、0.05mol/L 草酸(这些值接近塔里木盆地油田水实测值)，并控制初始 pH 0、温度，进行了16种不同条件下长石溶解作用的模拟实验研究。

9H2O compounds as raw materials, urea as mineralizer.

采用水热法以乙酸锌和硫化钠为原料，尿素为矿化剂制备ZnS纳米粒子。

Said method includes the following steps: firstly, adopting dipotassium hydrogen phosphate, magnesium sulfate, calcium chloride, citric acid, ammonium ferric citrate, disodium EDTA, sodium carbonate and minor element solution A5 to prepare culture liquor of nostoc according to a certain ratio; then controlling temp. light intensity and deration condition of the culture liquor to make culture of nostoc; third ste, harvesting nostoc; fourth ste, extracting nostoc polysaccharide; and fifth step, purifying, harvesing and drying nostoc polysaccharide.

首先是配制葛仙米培养液：采用磷酸氢二钾、硫酸镁、氯化钙、柠檬酸、柠檬酸铁铵、乙二胺四乙酸二钠盐、碳酸钠，微量元素溶液A5按比例配制；其次是葛仙米的培养：控制温度、光强、光质、培养液通气条件；第三是葛仙米的收获；第四是葛仙米多糖的提取；第五是葛仙米多糖的纯化、收获与干燥。

According to the Clausius-Mosotti-Debye equation,the dipole moment of the acetic ether is obtained to be 1.79D,which is close to the literature value.

根据Clausius-Mosotti-Debye方程，求出乙酸乙酯的偶极矩为1.79D，与文献值(1.78D)非常接近。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新