查询词典 first-order reaction

The first part of this dissertation described a new effective method for asymmetric synthesis of,α,α-disubstituted amino acids from the asymmetric Strecker reaction products of aldehydes.

在本论文的第一部分，我们开发了一条以醛为原料，以不对称Strecker反应和不对称烷基化为关键步骤的合成α，α双取代氨基酸的有效方法，并对其立体选择性结果进行了机理探讨。

When people see Elwood, that's their first reaction, they're, they're shocked.

人们看到埃尔吾德的时候，第一反应就是，被震惊了！

First azido deoxythymidine and 2 deoxy-inosine, deoxycytidine represented by two opened a prelude to the life-and-death struggle, but their toxic side effects, but also easy to produce drug resistance, especially azido deoxythymidine There are bone marrow suppression, leukopenia, with a total reduction in the number of lymphocytes and macrophages, such as reaction erythroblastic anemia.

首先以叠氮脱氧胸苷与二脱氧肌苷、二脱氧胞苷为代表揭开了这场殊死搏斗的序幕，可惜它们的毒副作用较大，又易产生抗药性，特别是叠氮脱氧胸苷还有骨髓抑制、白细胞下降、总淋巴细胞数减少及巨幼红细胞贫血等反应。

First, the preparation of the aminom ethylation of tannin using its electrophilic reaction activity of C-6, C-8 in ring-A; then process the quaternization base on the aminom ethylation; last, progress the sulfonation by use of the activity of phenolic hydroxyl hi ring-B.

首先利用单宁A环的C—6、C—8的亲电反应活性制备单宁胺甲基化产物；然后在胺甲基化的基础上进行季胺盐化；最后利用单宁B环的酚羟基的活性进行磺化。

First, a detailed study was made on the HRP-H〓O〓- phenolic compounds fluorogenic reaction.

首先，详细研究了辣根过氧化物酶用于荧光免疫分析中的对位取代酚类化合物氧化反应的酶活性与产物荧光的pH不匹配问题。

In this study, we first synthesize a conducting polymer, P3HT, via Grignard metathesis method. And we functionalize the polymer chain end of P3HT into vinyl group. After characterize from 1H NMR spectroscopy, we use the end functionalized P3HT to proceed coupling reaction with P2VP anion.

为了达到这个研究目的，我们先利用格林纳置换法合成导电高分子P3HT，并将其尾端乙烯化，在经核磁共振仪确定结构后，利用此尾端乙烯化之P3HT与P2VP阴离子反应进行接合。

Bunte salt was first prepared by α-furfuryl chloride and sodium thiosulfate. Then under the reaction of Bunte salt with 2-methyl-3-furanthiol in the presence of sodium hydroxide, furfuryl 2-methyl-3-furyl disulfide was prepared.

首先以α-糠基氯和硫代硫酸钠反应制备Bunte盐，然后Bunte盐与2-甲基－3-呋喃硫醇在碱性条件下反应合成了产品糠基2-甲基－3-呋喃基二硫醚。

When Gluma is applied in vivo, two reactions occur: first, GA reacts with part of the serum albumin in dentinal fluid, which induces a precipitation of serum albumin; and, second, the reaction of GA with serum albumin forms dihydropyridinium, whose disproportionation gives rise to free radicals, and the free radicals induce the polymerization of HEMA.

首次提出Gluma的脱敏机理为：当Gluma涂在过敏的牙本质上时，首先戊二醛交联牙本质液中的血清蛋白并产生沉淀；同时戊二醛与血清蛋白的反应产生二氢吡啶盐，它发生歧化反应，歧化过程中会有自由基产生，从而引发HEMA 聚合，生成另外一部分沉淀，这两部分沉淀共同堵住牙本质小管，起到了脱敏作用。

First, we synthesized a new monomer,1-(3\'-aminopropyl)-4-acrylamido-1,2,3-triazole hydrochloride,via click chemistry and its block copolymer with NIPAM, PNIPAM-b-PAPAT,via RAFT polymerization.On the basis of the reaction between amine groups of the PAPAT block and glutaric dialdehyde,core cross-linked and shell cross-linked micelles with inverted structures were prepared at 25℃and 50℃,respectively.

借助于PAPAT嵌段上含有的氨基及PNIPAM嵌段的LCST效应，我们在其20℃和50℃的水溶液中分别制备了CCL胶束和SCL胶束，进一步地，我们利用由Click反应产生的1，2，3-三氮唑环对金属的强络合和稳定作用，分别对CCL胶束的内核与SCL胶束的外壳用金纳米粒子进行选择性修饰。

In this thesis, a series of complexes based on aromatic multicarboxylic acids have been successfully synthesized in solutions or under hydrothermal conditions. Their structure and properties are investigated.(1) Eight complex compounds have been synthesized and characterized by X-ray single crystal diffractive technology: The eight complexes are listed as following: [Cu242] complex 1 [Cd22(H2O)4]·4H2O complex 2 [Co(H2btc)(H2O)3] complex 3 [Co2(H2O)2]·H2O complex 4 [Ni22(H2O)4] complex 5 [Cu22(H2O)4] complex 6 [Co(H2biim)2(H2O)2](H2btc) complex 7 [Zn(H2biim)2(H2O)2](H2btc) complex 8 The structure of complex 1 is dinuclear complex resulted from weak interactions（0-D chain）; complex 2 is 1-D chain stucture result from interactions of water molecules; complex 3、4、5、6 are coordination polymers using hydrothermal synthses, where the first kind ligand is H4btc, the second kind ligand is phen and Co2+、Ni2+、Cu2+ as center ions, respectively. While the coordination enviroment of Co2+ is the same in complex 3, the coordination geometries around the Co atoms in complex 4 are obviously different because of the different reaction conditions. In complex 4, the 1-D chains are connected into 2-D layer through carboxy groups of ligand H4btc. The structures of complex 5、6 are 1-D chain stucture result from interactions of carboxy groups in ligand H4btc. Complex 7、8 are homeomorphy compounds. Either of them are linked to the 3-D chains through intermolecular hydrogen bonds. Each H4btc lose two protons and H2btc2- acts as negative electron balance.

合成了8个结构新颖的配合物，并用X-射线单晶结构分析方法确定了晶体结构，分别为： [Cu242] 配合物1 [Cd22(H2O)4]·4H2O 配合物2 [Co(H2btc)(H2O)3] 配合物3 [Co2(H2O)2]·H2O 配合物4 [Ni22(H2O)4] 配合物5 [Cu22(H2O)4] 配合物6 [Co(H2biim)2(H2O)2](H2btc)配合物7 [Zn(H2biim)2(H2O)2](H2btc)配合物8 配合物1是一个依靠弱作用连接的双核铜结构；配合物2借助水分子形成一维链状结构；配合物3、4、5、6是以H4btc为第一配体、phen为第二配体，通过水热法合成的配合物，其中，Co2+、Ni2+、Cu2+为中心离子；配合物3中的二价钴离子具有相同的配位环境，不同反应条件下得到的配合物4中的二价钴离子存在不同的配位环境，在配合物4中，一维链通过H4btc上的羧基形成一个二维层结构；配合物5、6是借助H4btc上的羧基形成的一维链状结构；配合物7、8属于异质同晶结构，它们的分子通过分子间氢键形成三维网状结构，H4btc上的羧基失去2个质子，作为一个二价负离子起到电荷平衡作用。

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。