Highly ordered periodic array of metallic nanodots fabricated through template‐assisted nanopatterning and its use for surface‐enhanced Raman scattering spectroscopy of flexible crystalline‐silicon nanomembranes

We report on the fabrication of highly uniform periodic arrays of metallic nanodots formed on glass substrates through a facile anodic aluminum oxide template‐assisted process and their use in selective surface‐enhanced Raman scattering spectroscopy to probe the structural properties of flexible crystalline‐silicon nanomembranes deposited on polymer substrates. A 14‐fold enhancement in Raman scattering was observed from the thin flexible silicon membranes deposited on polyethylene terephthalate substrates, which were used to probe the internal strains in the silicon nanomembrane as a function of the bending radius. Copyright © 2011 John Wiley & Sons, Ltd.     

The Electrochemical Activity Determination of γ-Glutamyl Transpeptidase

Abstract

The electrochemical activity determination of γ-glutamyl-transpeptidase is described using the electrogenic L-γ-glutamyl paraaminodiphenylamide substrate. In order to correlate the results with classical measurements involving chromogenic substrates, linear calibration curves for the amperometric detection of the released free amine, the kinetics of the catalysis and the enzyme level in one plasma sample have been compared to photometric experiments effectuated in parallel runs, in the same conditions, with L-y-glutamyl paranitroanilide as the substrate. Results show that this new technique applies successfully to such evaluations.     

Relative reactivities of halogen-substituted substrates (R-Br,R-C1) toward the halophilic attack by a carbanion

Relative reactivities of bromine-substituted substrates (R-Br) or chlorine-substituted substrates (R-CI) toward bromophilic or chlorophilic attack by a carbanion have been evaluated by the intermolecular competition kinetics. Relative reactivity orders are CF3CFBr2 >CF3CBr3≥CBr4 > CHBr3 > CF3CFBrCF2Br > CF2Br2 > BrCF2CF2Br > BrCH2CO2Et≥ BrCF2CFHBr > CH2Br2 > BrCH2CH2Br, and CI3CNO2 > CI3CCN > CI3CCOPh > cyclo-C5CI6> CI3CCOCI > CCI3CF2CI > CCI3CF3 ≥ CCI4 > CCI3CCI3 ≥ CCI3(CF2)2CI > CI3CCOCCI3 > CCI3(CF2)6CI > CI3CCO2Et > CI3CF > CI3CPh>CI3CCH2O2CCH3.     

Enzymatic methods of analysis: Novel approaches and applications

The results of a series of investigations dealing with the development of enzymatic methods for determination of biologically active compounds, viz., inhibitors, activators, and substrates of native and immobilized enzymes of the oxidoreductase (peroxidases, alcohol dehydrogenases) and hydrolase (alkaline and acid phosphatases) classes isolated from diverse sources are summarized. Novel original approaches, proposed by the authors, for improving the sensitivity, selectivity, and rapidity of the methods are discussed. Numerous examples of application of the developed enzymatic procedures for the analysis of a wide range of samples are given. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 583–597, April, 2007.     

Indium-Promoted Allylation of Alkynes with Allylic Alcohols: Highly Regioselective Synthesis of Halogen-Substituted 1,4-Dienes

Indium-promoted allylation of alkynes by direct use of allyl alcohols as the allylating agents has been developed under mild conditions, in which a wide range of allylic alcohols and alkynes (both aromatic and aliphatic alkynes) could be tolerated, and the corresponding halogen-substituted 1,4-dienes were obtained in moderate to excellent yields.     

陶瓷微细镀覆新技术的研究

建立微机处理体系(包括线路、图形设计,光照点选择及活化处理等)与化学镀铜相结合的微细镀覆新技术.该技术可在Al2O3基底上获得性能良好的Cu镀层,其布线速率达 50mm/s,线分辨率 35μm,工艺简便,条件温和,为陶瓷微细镀覆开辟了新途径.     

染料敏化太阳电池研究进展

本文介绍了染料敏化太阳电池(DSC)的结构和基本原理,综述了DSC各项关键技术的实验和产业化研究最新成果。对DSC中的几个重要组成部分：纳米半导体薄膜、染料敏化剂、氧化还原电解质、对电极和导电基底材料等几个方面的研究进展进行了详细的评述。回顾了DSC从实验室小电池研究到大规模产业化研究的发展,对该领域未来发展前景进行了展望。     

不同供氢底物用于测定H2O2的酶催化动力学研究

研究了牛血红蛋白(hemoglobin,Hb)作为过氧化物模拟酶,以酸性铬蓝K、罗丹明B、亚甲基蓝不同供氢底物测定H2O2的酶催化反应体系的催化特性和反应条件。探讨了采用不同底物测定时的催化反应机理。用于雨水中H2O2含量的测定,结果满意。     

模拟生物矿化过程原位合成活性纳米碳酸钙

生物矿化是一种广泛而复杂的固液之间、有机物和无机物间的物理化学过程．以少量有机质为模板,进行分子操作,高度有序地组合成无机材料．有机基质能作为构造支持的惰性底质或矿物沉淀的局限空间和核化作用的表面,确定矿物质点的形态大小、空间排列、结晶取向和同质多晶类型,并与生物晶体一起确定生物矿物硬体的机械性质．