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在有机溶剂中进行酶催化合成肽及肽类衍生物的研究进展 总被引:2,自引:0,他引:2
介绍了有机溶剂中含非天然组分的肽及肽类衍生物的酶催化反应,同时对研究有机溶剂中酶的活性与结构关系的谱学技术进行了评述. 相似文献
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在管式反应器中采用苯甲酸、聚乙二醇、固体古马隆树脂(S)、液体古马隆树脂(L)为添加剂来降低煤沥青中有害物质苯并芘的含量,以期使得煤沥青可绿色化应用。采用紫外-可见分光光度计分析煤沥青中苯并芘含量。考察了反应温度、反应时间、添加剂添加量、催化剂等工艺条件对添加剂脱除煤沥青中苯并芘的影响。结果表明,不同工艺条件能降低煤沥青中苯并芘的含量。在优化条件下,不同添加剂对苯并芘脱除率由高到低依次为:液体古马隆树脂、聚乙二醇、苯甲酸和固体古马隆树脂。分析其反应机理,这与催化剂的酸性相关,发生亲电取代反应。结果表明,液体古马隆树脂(L)在催化剂存在下对煤沥青中苯并芘脱除率可达73.0%,显示了良好的应用前景。 相似文献
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为了进一步拓展具有螺二氢茚骨架的亚磷酸酰胺酯、亚磷酸酯、亚膦酸酯等手性螺环单磷配体在不对称反应中的应用范围, 研究了手性螺环单磷配体在铑催化苯乙烯衍生物的氢甲酰化反应中的选择性. 相似文献
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苯乙烯吡啶类化合物合成的新方法 总被引:3,自引:0,他引:3
对Heck反应在苯乙烯吡啶类化合物合成中的应用进行了较为深入的研究,并提出了反应机理.采用改进的钯催化反应以高产率合成了一系列苯乙烯吡啶类化合物,为苯乙烯吡啶类化合物的制备提供了一种方便有效的新方法 相似文献
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聚合酶链式反应(PCR)技术是现代分子生物学核心技术之一,研究提高PCR扩增效率的方法具有重要意义。传统提高PCR扩增效率的方法具有较多局限性,使得PCR扩增仍不能达到理想的效果。随着纳米技术的发展,纳米材料具有特殊的表面效应和尺寸效应,表面能进行多种修饰,易与生物大分子蛋白质、核酸等相互作用,对生物分子的结构和功能产生特别的影响。研究利用纳米材料来提高PCR扩增效率的技术和方法,具有非常重要的理论意义和应用价值。本文引用文献41篇,综述了近年来纳米材料在PCR体系中应用的现状,并展望了今后纳米材料在PCR体系中应用的发展方向及其前景。 相似文献
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Xiao XY Li R Hurst D Zhuang H Shi S Czarnik AW Robichaud AJ Wacker DA Robertson DW 《Journal of combinatorial chemistry》2002,4(5):536-539
Alkyl aryl ether formation is a frequently employed reaction in organic synthesis. Ullmann condensation is an alternative method to the widely used Mitsunobu reaction and is very useful in situations where application of the Mitsunobu reaction is limited. By application of this reaction to solid-phase synthesis of a series of alkyl aryl ethers, reaction conditions (catalyst, solvent, temperature, time, etc.) for a sterically hindered class of alcohols were investigated and optimized. A range of aryl halides was used to explore the scope of the reaction in solid phase. 相似文献
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A stochastic simulation of simultaneous reaction and diffusion is proposed for the gas-liquid interface formed in the surface of a gas bubble within a liquid. The interface between a carbon dioxide bubble and an aqueous solution of calcium hydroxide was simulated as an application example, taken from the integrated production of calcium carbonate. First Gillespie’s stochastic simulation algorithm was applied in separate reaction and diffusion simulations. The results from these simulations were consistent with deterministic solutions based on differential equations. However it was observed that stochastic diffusion simulations are extremely slow. The sampling of diffusion events was accelerated applying a group molecule transfer scheme based on the binomial distribution function. Simulations of the reaction-diffusion in the gas-liquid interface based on the standard Gillespie’s stochastic algorithm were also slow. However the application of the binomial distribution function scheme allowed to compute the concentration profiles in the gas-liquid interface in a fraction of the time required with the standard Gillespie’s stochastic algorithm. 相似文献