氯乙酸的

Phenyl or m -tolyl selenoamides reacted with functionalized α-haloacetic acid in 1∶1 or 1∶2 molar ratio with no catalyst in various alcohols to undergo a selenium transfer reaction. This reaction in dif-ferent molar ratios furnished the same C—Se—Se—C coupling products with a special structure bis diselenide. A new and facile method for synthesis of such bis(alkoxycarbonyl-methyl) diselenides with the advantages of mild reaction conditions, high yields, easy availability of starting materials and good chemical selectivity was provided.

芳基硒代酰胺与氯乙酸在各种醇中无催化剂下以1∶1和1∶2的比例投入，发生硒转移反应，不同原料投入比下的反应生成了同一种C—Se—Se—C偶联产物——具有多功能团的二烷氧羰基甲基二硒醚，提供了一种新的合成二烷氧羰基甲基二硒醚的简便方法，且反应具有条件温和、产率高、原料易得和选择性好等优点。

In order to explore the extraction method of proteome and technique of 2-DE, we compared the extraction method between the TCA-ac-tone and the Tris-HCl, and improved the key steps of 2-DE. The Tris-HCl extraction was the most appropriate for Antiaris toxicaria seed proteome analysis because of the highest resolution and more informative 2-DE map. Those were the solid basis for the later research of studying on the discrepancy expression proteomics of Antiaris toxicaria Seed.

在探索适合箭毒木种子蛋白质组学研究双向电泳方法中，比较了三氯乙酸－丙酮沉淀法、和Tris-HCl法，以及对双向电泳过程中的关键步骤的改良，认为Tris-HCl法为最适方法，所得图谱背景清晰，蛋白质信息量最大，为箭毒木属植物的差异蛋白质组学的后续研究打下了坚实的基础。

We extract the lipid with hexane and then compare the removing effect of 20% trichoroacetic acid and 2.0mol/L chlorhydric acid after having condensed the extract.

将提取液浓缩后，利用正己烷萃取提取液中的脂溶性物质，然后分别测定在浓缩物中加入不同体积的20％的三氯乙酸及2mol／L的盐酸的除蛋白效果，结果显示盐酸为较佳的除蛋白试剂。

In this paper,we compared the photodegradation efficiency of nano-titania films by using dichloroacetic acid,rhodamine B and methyl orange as the photocatalytic referents and the ultraviolet lamp as the source light to generate the photocatalytic reaction.

针对纳米氧化钛光催化性能研究中缺乏统一有效表征标准的现状，比较了二氯乙酸、罗丹明B和甲基橙三种光催化活性评价物的热稳定性和对紫外光的稳定性，并以氧化钛纳米薄膜为光催化剂，研究了三种评价物的光催化降解效率表征，以及酸碱度、通氧条件等因素对评价物在光催化活性表征中的影响及其机理，归纳了三种评价物对于纳米氧化钛光催化活性表征的优缺点。

Glyoxylic acid was prepared by reaction of sodium hydroxide surplus with methyl dichloroacetate in methanol solution via neutralization of filtrate with 50 percentage sulfuric acid to pH 2～3 and hydrolyzation after separation of salts.

二氯乙酸甲酯和过量的氢氧化钠在甲醇溶液中反应，滤出氯化钠后，直接加入适量的 5 0 %的硫酸调 pH值为 2～ 3，滤出硫酸钠，蒸馏回收甲醇，水解、浓缩，得到不含乙二醛的 4 0 %乙醛酸溶液。

Then, the multidentate amine immobilized on silica gel was used as ligand for CuCl in ATRA of CCl_4 with MMA and methyl trichloroacetate with St repeatly. The conversion and purity of the product were determined through the gas chromatography and ~1H NMR respectively. Finally, the multidentate amine immobilized on silica gel was used as ligand for CuCl in ATRP of St initiated by TCPP and MMA initiated by MMTCB. The number average molecular weights of the polymers were determined through GPC.

此多齿胺改性硅胶配体被分别多次重复用于四氯化碳与甲基丙烯酸甲酯，三氯乙酸甲酯与苯乙烯的ATRA反应中，通过气相色谱测定了原料的转化率随时间的变化，且通过核磁~1H NMR测定了产物的纯度，我们还进一步将此种多齿胺改性硅胶配体用于TCPP引发St的ATRP和MMTCB引发MMA的ATRP反应中，通过GPC测定所得聚合物的分子量。

Goodcatalytic activities of the phosphine palladium complexes were observed incarbonylation of benzyl chloride with atmospheric CO. In some reactions the yieldof phenylacetic acid was 91% and the catalyst could be reused repeatedly in severaltimes.

这些钯配合物催化苄基氯的常压羰基化反应有较好的催化活性，有些反应中苯乙酸的产率可达91％，可重复使用，是一类环境友好的新型绿色催化剂。

The influence of various parameters on clean-up of neomycin in milk, including the concentration of trichloroacetic acid, centrifugation speed, the flow rate and the concentration of eluent, were investigated.

考察了三氯乙酸浓度、离心力的大小、样品过固相萃取柱的速度以及洗脱剂浓度等因素对牛奶中新霉素测定结果的影响。

The results showed that under the optimum conditions, the optimum conditions were determined that the microwave power for the two protases was 500W, and the microwave temperature was 46℃for Alcalase and 50℃ for Flavourzyme; the enzyme dosage was 9000U/g for Alcalase and 37.5LAPU/g for Flavourzyme, and the hydrolysis time was just 3min for Alcalase and 13min for Flavourzyme.

结果表明，在最适微波条件下（碱性蛋白酶的微波温度46℃，风味蛋白酶50℃，微波功率均为500W），碱性蛋白酶加酶量9000U/g，酶解3min，风味蛋白酶加酶量37.5LAPU/g，酶解13min，得到的酶解产物的水解度为50.94%，氮收率为96%，多肽得率34.45%，氮溶指数84.22%，三氯乙酸氮溶指数77.99%。

Slight stress corrosion cracking phenomenon occurred accompanying with a little dot corrosion. On the other hand, sensitised treatment will decrease the IGSCC resistance of stainless steel.

依据乙二醇蒸发器所处的实际工况，模拟了三种不锈钢材料的焊接接头在敏化状态和焊态下，在含有微量氯离子的甲酸乙酸介质环境中的腐蚀现象，实验结果表明：三种不锈钢材料的晶间腐蚀开裂敏感性很低，仅出现了轻微应力腐蚀开裂迹象，并且伴随轻微的点蚀。

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。