查询词典 formate

The results showed that the different mass concentration of HPAM's absorbance decreases slightly when the PH value of the buffer solution is 5.0, but its reproducibility is better;In order to make the absorbance become more stable, the reaction time was identified adding proper quantities of bromine water, sodium formate and starch-cadmium iodide reagent to the solution separately; the mass concentration curve of the HPAM was draw, by means of the straight degree of the curves, the coincidence degree of the straight line about the concentration of every sampling point and so on , it shows that the mixer has good mixed effect compared with the standard curve.

如下是一些主要问题：1）文章的行文格式。文章没有按照一般科技论文的表述方式，如1是引言，2是常用方法，其实这都应该是第一部分引言里应该介绍的，引言中应扼要介绍文章的研究背景、目的，意义，采用的主要方法等。还有3是实验装置，4是实验步骤，应该这些都是第二部分，试验材料与方法。2）文章的内容。文章应主要介绍本研究的具体内容，但是本文没有，如3 实验装置部分，这个721分光光度计的原理与论文内容联系不大，根本没必要介绍，标准曲线的研究应该放在最前面等。3）文章的表述不清。如HPAM是何物，文章一直没有介绍，什么曲线的直线度、浓度与直线的重合度、什么加入溴水后的时间，应该是反应时间，总之表述不清！ 4）文章的图表。图标绘制的很难看。如图2，应该纵坐标起始点从0.25开始，这样图形就会美观很多，图3又没有纵坐标标注，还多了一个纵坐标等。5）文章的结论。文章的结论中有些严格来说不是结论，而是实验中的现象与操作注意事项。

On the basis of existing international achievements in the development of methyl bromide alternatives,the author suggested that the practicability of sulfuryl fluoride,ethyl formate,propylene oxide,and carbonyl sulfide in China be approached and considered that sufuryl fluoride is most promising.

遗憾的是，它也和许多已被人类淘汰的其它熏蒸剂一样，由于它属于消耗大气臭氧层的物质[1]，为了保护人类子孙万代良好的生活环境，已经在国际上取得共识，把它列为逐步淘汰的物质[2]，而且已于1979年开始采取了具体的法规性行动[3][4]。

Formate the virus after invading cells, cause host ' s cell ' s supersession to change, biosynthesis does not control by oneself again, make between nucleic acid and a large amount of protein of virus synthetic.

3：合成病毒侵入细胞之后，引起宿主细胞代谢发生改变，生物合成不再由自身支配，使病毒的核酸和蛋白质大量的合成。

The effects that isopropyl xanthogen ethyl formate is synthesized with isopropyl xanthate under differ conditions has been studied.

考察了不同条件对异丙基黄药合成异丙基黄原酸甲酸乙酯的影响。

The formate activates the carboxylic acid and functions as a source of nucleophilic alkoxide.

羧酸甲酸激活的职能和核醇源泉。

The reduction of energy of activation in the concerted path of the aminolysis of phenyl formate was found to be more significant than that in the neutral stepwise process due to the solvent effect of water, ethanol and acetonitrile.

水、乙醇和乙腈溶剂可降低协同途径的活化能，溶剂化效应的大小对溶剂的极性不敏感。

Ethoxycarbonyl-4,5-dimethyl-pyrrole (7) was prepared from ethylacetoacetate, ethyl formate and methyl ethyl ketone via oximination, Claisen condensation, and reductive condensation. The bromization of compound 7 gave 2-ethoxycarbonyl-3-bromo-4,5-dimethyl-pyrrole(8), which could be transferred to 2-ethoxy-carbonyl-3-brome-4-methyl-5-formyl-pyrrole (9) by the formolation.

由乙酰乙酸乙酯、甲酸乙酯及丁酮等原料经过肟化、Claisen缩合、还原缩合成环得到2-乙氧羰基－4，5-二甲基－吡咯(7)，溴化生成2-乙氧羰基－3-溴4，5-二甲基－吡咯(8)，最后经过甲酰化反应得到目标产物2-乙氧羰基－3-溴－4-甲基－5-甲酰基－吡咯(9)。

To explore their catalytical capability, the esterification of phenyl formate and 1-butanol was chosen. It is found that the esterification yield exceeds 80%, which demonstrates the heteropoly acid has higher catalytic activity.

为了探索所得杂多酸的催化性能，考察了H_4PMo_(11)VO_(40)对苯甲酸和正丁醇酯化反应的催化效果，发现在最佳条件下酯收率达到80％多，证明其为一种较好的酸催化剂。

Miscellaneous compounds: Examples of this fourth group include vanillin, cinnamic acid,and geranyl formate.

其它化合物：第四类的例子有香草醛、肉桂酸和甲酸香叶酯。

The quantitative analysis of the mixture of butyl acetate, dimethylbenzene and benzene is done with gas chromatography, taking methyl formate as internal standard.

采用气相色谱法，以甲酸甲酯为内标物，对在所研制催化剂作用下氧化反应前后的醋酸丁酯、二甲苯和苯进行了一次定量分析。

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。