查询词典 acetic aldehyde

We discovered that the best stereoselectivity of the Pictet-Spengler (cis/trans=92:8) was obtained, when the reaction of D-tryptophan methyl ester II-33 with piperonal II-34 in acetic acid was catalyzed by benzoic acid at room temperature.

我们发现室温下在冰醋酸中，D-色氨酸甲酯II-33和胡椒醛II-34在苯甲酸催化下，发生Pictet-Spengler反应的立体选择性最高， cis：trans的比例为92： 8。

" Cypress together benefit the 斯 tooks a look cup carefully, having already tooked a look an oneself's hand to say with smile, I know why:"Ising the top of the my hand is these platinum black powder reasons, these powders make the alcohol in the grape wine(note:The scientific term is called ether)have chemical reaction with the oxygen in the air, born the cause of acetic acid.

" 柏齐利阿斯仔细的看了看杯子，有看了看自己的手笑着说，我知道为什么了："是我手上这些铂黑粉末原因，这些粉末使红葡萄酒里的酒精与空气中的氧气起了化学反应，生成了醋酸的缘故。

Chemical Additives, Auxiliary: ketamine , phosphoric acid , sodium hydroxide , acetic acid , potassium chloride , sodium bicarbonate , bentonite , calcium chloride , sodium chloride , bromelain , hydrochloric acid , titanium dioxide , potassium nitrate , anhydrous ammonia , stearic acid

相关分类：辅助化学添加剂，高聚合物，无机盐本公司注册为免费会员，未通过TradeKey.com验证或认证。只有银匙和金匙会员是已通过第三方信用调查机构认证和验证的。点击这里了解更多关于金匙和银匙会员

Add 30 mL of a mixture of glacial acetic acid and chloroform (3／2), shake to dissolve, and add 0.5 mL of saturated potassium iodide solution.

放入30毫升的混合冰醋酸和氯仿（ 3 / 2 ），摇晃分解，并加上0.5毫升饱和碘化钾溶液。

Place in a 250 ml conical flask fitted with a ground-glass stopper, 10.0 ml of the solution, 50 ml of water R, 12 ml of dilute acetic acid R and 3 g of potassium iodide R.

滴定 在250ml的带磨砂玻璃塞的锥形瓶中，加入10.0 ml的此溶液，50ml的水，12ml的稀乙酸和3 g的碘酸钾。

Nd_2O_3 was used as catalyst for estrification of Acetic acid with propanol and discussed thevariant conditions in reaction of esterification.

以三氧化二钕为固体催化剂，实现了乙酸和丙醇的酯化反应，讨论了催化酯化的各种影响因素。

The conversion of acetic acid and the selectivity of propylene reached 85.43% and 98.52%, respectively.

本文还对乙酸与丙烯直接酯化合成乙酸异丙酯的动力学进行了研究。

Methods: Ligating pylorus method, acetic acid and reserpine were used to induce gastric ulcer models in rats and mice, respectively.

目的：观察比较胃益油剂、胃益糖片、胃益胶囊3种药物对动物实验性胃溃疡的影响。

Rat experimental ulcers were induced by stress(swimming in cold water for 30 min), administration of acetic acid or indomethacin, and ligation of gastric pylorus.

大鼠溃疡造型用应激法(冷水中游泳30 min)、醋酸法、消炎痛法和幽门结扎法诱导产生。

With alcoholic fermented Pyracantha fortuneana wine as the main raw material,the initial alcohol concentration,temperature,pH and initial inoculum density in acetic fermentation were studied in a single-factor experiment.

以火棘果酒为主要原料，在醋酸摇瓶发酵中，对初始酒精度、温度、pH和接种量进行单因素试验，试验结果以醋酸含量的多少为指标来评价。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。