查询词典 first-order reaction

Amino-monomethoxypoly(ethy1ene glycol)(mPEG-NH2) was synthesized based on the principle of Gabriel synthesis.Monomethoxypoly(ethy1ene glycol) tosylate was prepared at first,and then reaction with potassium salt of phthalimide as nucleophile to produce the monomethoxypoly(ethy1ene glycol)phthalimide derivative.

摘 要：首先合成了单甲氧基聚乙二醇对甲苯磺酸酯，然后根据盖布瑞尔合成法原理，以邻苯二甲酰亚胺钾盐为亲核试剂与mPEG-OTs反应，生成单甲氧基聚乙二醇的邻苯二甲酰亚胺衍生物，mPEG-PI与水合肼反应肼解生成伯胺，合成了一端为氨基的单甲氧基聚乙二醇(mPEG-NH2)。

A series of 2-substituted benzimidazoles were synthesized by the reaction of o-phenylenediamine with corresponding acid in polyphosphoric acid under microwave. 11 Compounds were synthesized in this way first time.

以邻苯二胺及相应的羧酸为原料，微波辐射下，合成了18种2-取代苯并咪唑衍生物，其中11种化合物的微波合成未见文献报道，研究并优化了反应条件。

For the first time, the method of the change of active components content is used to investigate the pozzolanic reaction kinetics of FBC ashes and PF ashes.

目前主要采用氢氧化钙变化量法和化学结合水量法研究火山灰质掺合料的火山灰水化反应动力学，而本研究首次采用了活性组分变化量法。

The research of polymer/layered silicate nanocomposite was introduced detailedly, including the classify, property and the latest research advance. On the basis of consulting the document and the exploratory experiment, the experimental method which first creative preparing poly (acrylonitrile-vinyl acetate)/raontmorillonite nanocomposite by emulsion intercalation copolymerization was established; the structure and property of polyacrylonitrle different molecule weight with inorganic mineral super fine nanocomposite was reseached. The reaction principle of PMMA by photo-initution was explored. The mixture principle with productor condition, property of PE/Clay nanocomposite milt insert was seal prived. By PS/Clay nanocomposite munufacture, the monomer ins-polymerization and polymerial solution was proved.

在查阅文献和探索性实验的基础上，确定采用乳液原位插层聚合方法首先创制了聚/蒙脱土纳米复合材料，利用正交实验得出了最佳实验条件，通过X射线衍射和红外光谱对纳米复合材料的结构进行表征，研究了复合材料的溶解性能，并测定了其溶液的绝对粘度；研究了不同相对分子质量的聚丙烯腈与不同的无机矿物超细粉复合材料的结构与性能；探讨了在蒙脱土中光引发聚甲基丙烯酸甲酯的反应机理；通过聚乙烯与粘土的纳米复合材料制备，探讨了热塑性树脂熔融插层复合机理与最佳工艺条件和复合材料性能关系；通过聚苯乙烯与蒙脱土纳米复合材料制备，验证了单体原位聚合插层和聚合物溶液插层机理。

A(C2H5)3N·HCl-induced palladium complex PdL2Cl2 and CuCl2 catalyzed cyclotrimerization reaction of Ethyl Propiolate has been reported for the first time.

报道了一类三乙胺盐酸盐存在下钯PdL2Cl2-CuCl2催化体系催化的丙炔酸乙酯(Ethyl Propiolate，简称EP)环三聚反应。

An S_N2 mechanism with water as the nucleophile appears to be the most likely candidate.We reported for the first time the hydrolysis reaction mechanism of amide in high temperature water,and found a scientistic base for the hydrolysis possibility of amide linkages in peptide and protein in HTW.

本研究首次报道了高温水中酰胺的水解反应机理以及水在酰胺水解过程中所起的作用，为肽键以及蛋白质在高温水的水解研究提供了科学依据。

It is for the first time that Spinacia oleracea ferredoxin immobilized on the surface of the carbon nanotube modified glassy carbon electrode(SoFd-CNT/GC) can undergo effective and stable direct electron transfer reaction.

将来源于Spinacia oleracea的铁氧化还原蛋白(ferredoxin，SoFd)通过吸附的方法固定在碳纳米管表面。红外光谱表明SoFd固定在CNT表面后没有变性。

The composition and structure of Soybean Protein Isolate are first introduced,Then the functional modification of SPI via chemical ways which include the reaction of amino group,carboxyl group and sulphydryl group,via enzymic ways which include the modification using transglutaminase enzyme and papain,via physical ways which include blending and heat treatment are reviewed.

首先介绍了大豆分离蛋白的基本组成与结构，然后分别从化学改性、酶改性和物理改性三个方面对大豆分离蛋白改性进行了综述。其中，在化学改性方面，针对大豆分离蛋白中含有的氨基、羧基、巯基等不同活性基团的改性原理及研究现状进行了介绍。在酶改性方面，主要介绍了谷胺酰胺转胺酶、木瓜蛋白酶等对大豆分离蛋白的改性作用。在物理改性方面，介绍了共混、加热改性等目前研究较多的方法。

In the first part, the prototropic hydroxy-oxo tautomerisms of 2 (1H)- pyridones/2-hydorxypyridines, one of the most important model systems in molecular biology, have been investigated with self-consistent reaction field method based on continuum model. The influence of the nature and position of substituent groups, the existence of intramolecular hydrogen bonding and tautomeric competition between 2-hydroxy and 4-hydroxy on the tautomeric equilibria have also been examined.

第一部分，首先从溶剂敏感的异构化性质入手，用基于连续介质的自洽反应场理论方法对一类重要的生化模型体系—2（1H）-吡啶酮／2-羟基吡啶互变异构体系进行了研究，系统地考察了取代基性质、取代基位置、分子内氢键的形成以及互变异构竞争的存在对异构化平衡的影响。

The first step was to synthesize imidazoline. The mole ratio of oleic acid and diethylene triamine was 1:1.2, the xylene was 30%. Temperature was controlled in about 160 ℃ on this stage, timing for acylation reaction was about 1.5 hours.

第一步咪唑啉的合成：油酸和二乙烯三胺摩尔比为1：1.2，以二甲苯为携水剂，反应温度控制在160℃酰化反应1.5小时，然后升温至220℃环化反应，反应时间6.5小时。

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。