查询词典 acid reaction

The reaction of sucrose with triethyl orthoacetate is carried out in DMF solution catalyzed with toluene p-sulphonic acid at ambient.

以DMF为反应介质，对甲苯磺酸催化原乙酸三乙酯与蔗糖室温下的环酯化反应。

Under ultrasonic radiation,four single substituted arylboronic acid were synthesized through the reaction of trisubstituted borate and halogenated hydrocarbon induced by iodine.

在超声条件下，以碘为催化剂，利用硼酸酯与卤代芳烃、金属镁粉合成了4种单取代芳基硼酸。

Molybdophopsphoric Acid Catalysis in the Oxidative Cleavage of Olefins by the Hydrogen Peroxide Oxidative cleavage of the double bond could be catalyzed by H_3PMo_(12)O_(40) using H_2O_2 as oxidant, various trisubstituted olefins were oxidized to aldehydes or ketones in high yields. The system was not satisfied for electron-deficient olefins such as trans-(2-nitrovinyl) benzol or chalcone. The reaction of aliphatic olefins did not occur under the same conditions.

二、磷钼酸催化过氧化氢对烯烃的氧化断裂反应用过氧化氢(30％)作为氧化剂，磷钼酸可以催化氧化碳碳双键的断裂反应，三取代的烯烃被氧化生成醛或酮，产率较高；此体系对于缺电子烯烃如查尔酮，不饱和硝基化合物的断裂反应效果较差，脂肪族烯烃在此体系下的氧化并不发生。

The reaction results show that the catalytic activity and selectivity of W-HMS prepared with tungstic acid is better than that prepared with sodium tungstate. And the consumption of t-BuOH also is successfully reduced.

实验结果表明：钨酸是制备W-HMS催化剂很好的钨源，以钨酸为原料制备的催化剂具有很高的催化活性和选择性，使溶剂叔丁醇用量大为减少。

Compared to traditional products and raw materials, high waterproof, fire protection, the moth, wipehis acid, surface resistance, no chemical reaction, unirradiated, easy to clean, not fragile, light weight, high strength, excellent environmental adaptation.

产品与传统原材料相比，具有高防水、防火、防蛀、防酸、表面耐擦、无化学反应、无放射性、易清洗、抗老化、不易碎、重量轻、强度高、环保适应性极佳等特点。

All the cases were compared locally biopsy under vaginoscope. We observed the reaction of the blood vessel of cervical epithelium with acetic acid on the green filter disc under vaginoscope.

用阴道镜绿色滤光片仔细观察涂醋酸后宫颈上皮血管的反应及整个宫颈醋白上皮变化并定位活检，全部病例匀在阴道镜下定位活检进行对照。

Abstract］ objective to compare with curative effect and adverse reaction on renal anemia of hemodialyses patients with fe3 dextran venously and ferromyn orally.methods 60 hd patients were divided into venous group and oral group randomly and there were 30 patients in each group,100 mg cosmofer were used one hour by vein point of dialyser before hd was completed in hemodialyses patients in venous group 200 mg amber acid subiron was taken by the patients in oral group three times a day and two months in total.recombinant human erythropoietine was used at a dose of 100～150 u/kg?

摘要］ 目的比较静脉注射右旋糖酐氢氧化铁和口服琥珀酸亚铁治疗血液透析患者肾性贫血的疗效和不良反应。方法选择60例hd患者，分为静脉补铁组和口服补铁组，每组30例。静脉补铁组：每次透析结束前1 h注射100 mg右旋糖酐氢氧化铁，从透析器静脉端输入，时间维持1 h；口服补铁组：琥珀酸亚铁200 mg，每日3次，连续口服2个月。两组同时使用基因重组人红细胞生成素100~150 u/kg？

We through search the stable zwitterionic conformers in solution using Self-Consistent Reaction Field Model. We study the properties of aspartic acid such as ionization energies, electron affinities and IR spectra and compare with the results in gas phase.

我们使用自洽反应场模型对天冬氨酸水溶液中的双电性构型进行了系统的寻找，研究了水溶液中天冬氨酸构型的电离能、电子亲合能以及红外光谱等性质，并与气相中的结果进行了对比。

In solvent and under the action of certain catalyst, anilino methyl siloxane is reacted to obtain solid cage anilino methyl sesquisiloxane octamer acid salt; and through filtering, washing, precipitation and reaction with amine desalting agent, cage anilino methyl sesquisiloxane octamer is finally prepared.

本专利提供了一种笼型八聚苯胺甲基倍半硅氧烷的制备方法，苯胺甲基硅氧烷在一定溶剂和催化剂作用下反应，过滤得到笼型八聚苯胺甲基倍半硅氧烷酸式盐固体，经过洗涤、沉淀，再与胺类脱盐剂作用，最终制得笼型八聚苯胺甲基倍半硅氧烷。

The cDNA squence of antibiotic, an antibacterial peptide, a process for preparing the said cDNA and a process for recombining the antibacterial peptide are disclosed. The present frequency of amino acid codens in Attacin A cDNA is analyzed. The high-frequency coden is introdued to its protein sequence to configure its cDNA sequence. The target gene is synthesized by chemical synthesis method or polymerase chain reaction.

本发明公开了葛佬素的cDNA序列，葛佬素cDNA的制备方法以及重组抗菌肽葛佬素的制备方法；通过对同种已知蛋白质Attacin A cDNA中氨基酸密码子的出现频度进行分析，采用出现频度高的密码子带入葛佬素蛋白质序列中进行葛佬素的cDNA序列构建，用化学合成法及聚合酶链式反应进行目的基因的合成，另外，采用基因重组法制备抗菌肽葛佬素，并测定了其活性。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。