乙酸

DCA, or dichloroacetic acid, is an analogue of acetic acid in which chlorine atoms replace two of the three hydrogen atoms on the methyl group.

DCA也叫二氯乙酸或二氯醋酸，是一种类似乙酸的化合物，但乙基团上有两个氢原子被氯原子所取代。

The photocatalytic degradation of dichloroacetic acid and trichloroacetic acid solution with titanium dioxide(TiO_2) thin films is investigated in the paper.

用常压化学气相沉积法镀TiO2薄膜，以紫外灯为光源，对二氯乙酸和三氯乙酸溶液进行光催化降解，并证实了此过程符合一级反应动力学方程。

This study developed a new method on the determination of carcinogenic disinfection by-products-trace dichloroacetic acid and trichloroacetic acid in tap water by ion chromatography-electrospray-tandem mass spectrometry(IC-ESI-MS/MS).

建立了一种采用离子色谱-串联电喷雾四级杆质谱联用技术检测自来水中可致癌的饮用水消毒副产物二氯乙酸和三氯乙酸的方法。

The rather amount of dichloroacetic acid not only enhances consumption of raw materials, but also increases the cost, with the difficulty to separate it from the product later the quality of products drops. Dichloroacetic acid is of a few uses causing the huge waste of the fund and equipments.To control the dichloroacetic acid coming out and decrease the consumption o

通过大量实验，对反应精馏技术的原理进行了理论研究，从中探索得出反应精馏法合成氯化节、氯乙酸等有机氯化物的工艺路线，为氯化节和氯乙酸的生产提供了一条新的生产工艺，为反应精馏技术应用的理论研究拓展了新的内容，并为工程设计提供了基本数据。

Good correlations were obtained between aromatic ring destruction and trichloroacetic acid , but dichloroacetic acid production were related to not only activated aromatic ring but also nitrogenous type structures such amino acid type structure.

从腐殖质的结构特性与卤乙酸的相关性分析，得出三氯乙酸的形成主要与腐殖质的芳香环的断裂有关。DCAA的形成则与腐殖质上芳香环和含氮官能团的多少有关。

U. S. EPA' s long carcinogenic test reported that dichloroacetic acid could induce hepatic cancer in rat and mice, and trichloroacetic acid could induce hepatic cancer in mice.

美国环境保护局长期致癌试验研究报告，二氯乙酸(dichloroacetic acid， DCA)可分别导致大鼠和小鼠肝癌，三氯乙酸(Trichloroacetic acid， TCA)可导致大鼠肝癌。

DNA damage; chloridized disinfection by-products dichloroacetic acid; trichloroacetic acid; comet assay; RDPCR; p53 gene

DNA损伤；氯化消毒副产物；二氯乙酸；三氯乙酸；彗星试验；依赖随机化末端连接物PCR； p53基因

In the presence of sodium as catalyst, the ester exchange reaction between methyl dimethoxy acetate and cephalotaxine produced cephalotaxine dimethoxy acetate, which was then hydrolyzed in dilute hydrochloric acid. Spectrum analysis showed one of hydrolytic products was cephalotaxinone.

本文报导己二甲氧基乙酸甲酮和三尖杉碱在金属钠催化下，直接进行酯交换反应生成二甲氧基乙酸三尖杉酯，后者在稀盐酸中水解，水解产物之一经光谱分析碳定为三尖杉酮碱。

In order to investigate the mechanism for this reac-tion, methyl α-bromoacetate or ethyl α-bromoacetate as starting material was added to the solution of phenyl selenoamide in ethanol in 1∶1 or 2∶1 molar ratio under the neutral condition at room temperature. The results indicated that the same product bis or bis diselenide was formed. Byproduct ethyl benzoate was also separated.

为了研究该反应机理，选择α-溴代乙酸甲酯或α-溴代乙酸乙酯在无催化剂、中性条件下，乙醇溶液中与苯基硒代酰胺室温下反应，投料比为1∶1和2∶1，结果也都生成了同一类产物二甲氧羰基甲基二硒醚或二乙氧羰基甲基二硒醚，同时还分离得到了相应的副产物苯甲酸乙酯。

In order to investigate the mechanism for this reaction, methyl α-bromoacetate or ethyl α-bromoacetate as starting material was added to the solution of phenyl selenoamide in ethanol in 1:1 or 2:1 molar ratio under the neutral condition at room temperature. The results indicated that the same product bis or bis diselenide was formed. Byproduct ethyl benzoate was also separated.

为了研究该反应机理，选择α-溴代乙酸甲酯或α-溴代乙酸乙酯在无催化剂、中性条件下，乙醇溶液中与苯基硒代酰胺室温下反应，投料比为1：1和2：1，结果也都生成了同一类产物二甲氧羰基甲基二硒醚或二乙氧羰基甲基二硒醚，同时还分离得到了相应的副产物苯甲酸乙酯。

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。