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   氨基酸配体 的翻译结果: 查询用时:0.261秒
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氨基酸配体
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  amino acid ligand
     The structural characterization of the title catalysts indicates that the activity center may be complex compound composed of the -COOH of amino acid ligand and PdCl3 The hydrogenation activity of the title catalysts is very high for acrylonitrile and styrene, but inactive for nitrobenzene.
     催化剂的结构表征说明,其活性中心的组成可能是氨基酸配体的羧基与PdCl_2的络合. 这种催化剂对丙烯腈和苯乙烯有较高的加氢活性,而对硝基苯的氢化没有催化活性.
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  “氨基酸配体”译为未确定词的双语例句
     The results Showed that with lowerreation ratios of amino acids and metals,chelates with a compounding ration of 1:1 were readilyformed,whereas with concentrations of the amino acid ligands twice great as those of the metals,chelates with a compounding ratio of 2:1 would result.
     结果表明,当氨基酸与金属反应的摩尔比较低时,易形成配位比为1:1的螯合物; 当氨基酸配体的浓度大于2倍的金属离子浓度时,可形成配位比为2:1的螯合物。
短句来源
     Synthesis of Chiral Bis-N-squaramidoacids and Thiazolidine Ligands and Their Applications in Catalytic Asymmetric Reductions
     手性双方酰化氨基酸配体和手性噻唑烷类配体的合成及不对称催化还原反应
短句来源
     Using natural ephedrine and L-proline as chiral sources, we first synthesized series of squaramidoalcohol ligands with alkoxy, amino and sulfur groups on C-3 position, respectively.
     方环C3位分别为方酸酯和方酰胺的手性方酰化氨基酸以及桥联双方酰化氨基酸配体
短句来源
     In this paper, we designed two routes to synthesize a series of bis-squaramidoacid ligands bridged by 1,2-diphenylethylenediamine.
     本文设计了两条路线来合成一系列以1,2-二苯基乙二胺为桥联基团的双方酰化氨基酸配体
短句来源
     The experimental results showedthat not only the ligand anion but also the zwitterion is an attacking species in thecomplexation reaction.
     实验结果表明,不仅氨基酸配体的负离子(NRO-或 L~-)具有较高的反应活性,而且两性离子(HN~+RO~-或~+HL~-)也是有效的反应配体.
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  相似匹配句对
     Resolution of DL-Amino Acids by Hydrophilic Ligand Exchange Resin
     亲水性手性配体树脂对氨基酸的拆分
短句来源
     CHEMICAL SYNTHESIS OF AMINO ACIDS
     氨基酸的化学合成
短句来源
     Synthesis of Ligand Exchange Chromatographic Supports with Polyacrylamide Matrix and Its Application to the Separation of Amino Acids
     聚丙烯酰胺型配体交换色谱载体的合成及分离氨基酸
短句来源
     Biogeochemistry of Amino Acids
     《氨基酸生物地球化学》
短句来源
     and(3)ion and anion receptor additives.
     (3)配体添加剂。
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  amino acid ligand
Amino acid ligand 2-methacrylamidoalanine (MAAL) monomer was synthesized using methacryloyl chloride and alanine.
      


The kinetics of the complexation reaction of some N-(p-substituted phenyl)glycineswith Ni(Ⅱ)at 25℃ and ionic strength 0.1 mol·dm~(-3)in 30%(volume)ethanol solutionhas been studied by means of stopped-flow method.The experimental results showedthat not only the ligand anion but also the zwitterion is an attacking species in thecomplexation reaction.The reaction takes place by way of two competing paths,one isthe anion path which proceeds according to the Eigen-Tamm mechanism and anotherone is the zwitterion by...

The kinetics of the complexation reaction of some N-(p-substituted phenyl)glycineswith Ni(Ⅱ)at 25℃ and ionic strength 0.1 mol·dm~(-3)in 30%(volume)ethanol solutionhas been studied by means of stopped-flow method.The experimental results showedthat not only the ligand anion but also the zwitterion is an attacking species in thecomplexation reaction.The reaction takes place by way of two competing paths,one isthe anion path which proceeds according to the Eigen-Tamm mechanism and anotherone is the zwitterion by which the rate-determining step involves proton transfer.Thereactivity of the zwitterions increased with decreasing basicity of the ligands.A linearfree-energy relationship holds for all the reactions studied:log k_(HL)=5.36-0.482 pK_2It was found that some linear free-energy relationships also exist between thedissociation rate constants and the basicity of the ligands and the stability constants ofthe binary complexes as well,with the following regression expressions:log k_(-L)-=5.56-0.815pK_2 and log k_(-L)-=4.84-0.973 log K_(N(?)L)~(N?)

应用断流分光光度计(Stopped-Flow Spectrophotometer)研究了镍(Ⅱ)与 N-(对位取代苯基)-氨基乙酸(p-RC_6H_4NHCH_2COOH,R=CH_3O,CH_3,H,Cl,简写为 NROH 或 HL)在25℃及30%(v/v)乙醇溶液中生成配合物的反应动力学.实验结果表明,不仅氨基酸配体的负离子(NRO-或 L~-)具有较高的反应活性,而且两性离子(HN~+RO~-或~+HL~-)也是有效的反应配体.反应按双途径进行,即按 Eigen-Tamm 机理进行的 NRO-途径和以质子迁移为速率控制步骤的两性离子途径.两性离子的反应活性(以 logk_(HL~±)表示)与配体的碱性强度(pK_2)之间呈现直线自由能关系:logk_(HL~±)=5.36-0.432pK~2并发现镍(Ⅱ)配合物的离解反应速率常数(log k_(-L~-))与配体的碱性强度(pK_2)和配合物的稳定常数(logK_(NiL)~(Ni))之间均存在直线自由能关系,其线性回归方程分别为:logk_(-L~-)=5.66-0.815pK_2和 logk_(-L~-_=4.84-0.973logK_...

应用断流分光光度计(Stopped-Flow Spectrophotometer)研究了镍(Ⅱ)与 N-(对位取代苯基)-氨基乙酸(p-RC_6H_4NHCH_2COOH,R=CH_3O,CH_3,H,Cl,简写为 NROH 或 HL)在25℃及30%(v/v)乙醇溶液中生成配合物的反应动力学.实验结果表明,不仅氨基酸配体的负离子(NRO-或 L~-)具有较高的反应活性,而且两性离子(HN~+RO~-或~+HL~-)也是有效的反应配体.反应按双途径进行,即按 Eigen-Tamm 机理进行的 NRO-途径和以质子迁移为速率控制步骤的两性离子途径.两性离子的反应活性(以 logk_(HL~±)表示)与配体的碱性强度(pK_2)之间呈现直线自由能关系:logk_(HL~±)=5.36-0.432pK~2并发现镍(Ⅱ)配合物的离解反应速率常数(log k_(-L~-))与配体的碱性强度(pK_2)和配合物的稳定常数(logK_(NiL)~(Ni))之间均存在直线自由能关系,其线性回归方程分别为:logk_(-L~-)=5.66-0.815pK_2和 logk_(-L~-_=4.84-0.973logK_(NiL)~(Ni)

The rate constants of ligand exchange reactions of the complexes of copper(Ⅱ) with amino acids in aqueous solution have been determined by proton NMR line broadening studies. The experimental results showed the experimental line width to be linearly proportional to the free-ligand coucentration. The relationship between the line width and the ligand exchange rate constant was derived from NMR theory and kinetic considerations. The order of the exchange

采用Varian XL200超导核磁谱仪,在200.057MHz和25±0.5℃条件下,测定了水溶液中Cu(Ⅱ)分别与脯氨酸、缬氨酸、α-氨基丁酸、苏氨酸、丙氨酸和甘氨酸配合物的配体交换反应速率常数.根据NMR原理导出了实验线宽与配体交换反应速率常数之间的关系,解释了弛豫时间随配体浓度的变化关系.实验表明,交换反应速率大小顺序与氨基酸配体的空间因素一致,即随氨基酸的碳原子数增加,交换反应速率常数减少.根据实验结果提出涉及三角双锥过渡态的反应机理.

This paper is concerned with synthesis of poly-γ-(L-glycyltrytophane) propylsiloxane palladium catalysts in different N/Pd ratioes and study on its hydrogenation activity for olefins and nitrobenzene. The structural characterization of the title catalysts indicates that the activity center may be complex compound composed of the -COOH of amino acid ligand and PdCl3 The hydrogenation activity of the title catalysts is very high for acrylonitrile and styrene, but inactive for nitrobenzene. Besides, the hydrogenation...

This paper is concerned with synthesis of poly-γ-(L-glycyltrytophane) propylsiloxane palladium catalysts in different N/Pd ratioes and study on its hydrogenation activity for olefins and nitrobenzene. The structural characterization of the title catalysts indicates that the activity center may be complex compound composed of the -COOH of amino acid ligand and PdCl3 The hydrogenation activity of the title catalysts is very high for acrylonitrile and styrene, but inactive for nitrobenzene. Besides, the hydrogenation activity was influenced by solvent and reaction temperature.

本文报道了不同N/Pd摩尔比的聚γ-(甘-色二肽基)丙基硅氧烷钯催化剂的合成及对烯烃和硝基苯的加氢活性.催化剂的结构表征说明,其活性中心的组成可能是氨基酸配体的羧基与PdCl_2的络合.这种催化剂对丙烯腈和苯乙烯有较高的加氢活性,而对硝基苯的氢化没有催化活性.并研究了溶剂和温度对加氢活性的影响.

 
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