Now showing items 2371-2390 of 14235

    • D - Quinic Acid, A Versatile Chiron in Organic Synthesis 

      黄培强 (中国化学会, 1999-04)
      综述了D-奎尼酸在各种环状和链状生物活性化合物合成中的应用。奎尼酸分子中特有的顺式γ-羟基羧酸的结构单元提供了区别分子中各种羟基,以及进行其它区域选择性和立体选择性控制的方便途经。奎尼酸的结构特征以及其价廉、易得的优点,使之成为一个有用的而且重要的手性合成子。This review describes the use of D - Quinic acid in the synthesis of various natural or un ...
    • D-奎尼酸:一个多用途的手性合成子 

      黄培强 (1999)
      综述了d-奎尼酸在各种环状和链状生物活性化合物合成中的应用。奎尼酸分子中特有的顺式γ-羟基羧酸的结构单元提供了区别分子中各种羟基,以及进行其它区域选择性和立体选择性控制的方便途经。奎尼酸的结构特征以及其价廉、易得的优点,使之成为一个有用的而且重要的手性合成子。
    • D-葡萄糖酸钠对模拟混凝土孔隙液中钢筋的缓蚀作用 

      李建华; 赵冰; 杜荣归; 林昌健 (2007-03-20)
      应用电化学阻抗谱研究D-葡萄糖酸钠对含有氯离子的模拟混凝土孔隙液中钢筋的缓蚀作用,并对其缓蚀机理进行探索。结果表明,0.01mol/L D-葡萄糖酸钠对钢筋具有良好的缓蚀效果,其缓蚀作用主要是通过在钢筋表面和氯离子竞争吸附,最终形成一层吸附膜对钢筋起到保护作用。
    • D_4/APAEDMS本体开环共聚反应机理及调控基元反应 

      罗正鸿; 曹志凯; 詹晓力; 陈丰秋; 阳永荣 (2005-08-30)
      MonteCarlo方法首次用来揭示八甲基环四硅氧烷(D4)与N-β-氨乙基-γ-氨丙基甲基二甲氧基硅烷(APAEDMS)的本体开环共聚反应机理的关键调控基元反应.基于已提出的该体系本体共聚反应机理,并兼顾模拟精度与计算经济性,MonteCarlo模拟模型采用自由体积理论简化扩散效应并与本征反应动力学方程耦合.其中,本征动力学速率常数通过模拟主要共聚基元反应得到.基于优化的动力学速率常数通过模拟从分子水平上揭示:D4/APAEDMS本体 ...
    • D_4/APAEDMS本体开环共聚反应的Monte Carlo模拟 

      罗正鸿; 詹晓力; 陈丰秋; 阳永荣 (2004-06-30)
      应用MonteCarlo方法模拟八甲基环四硅氧烷与N β 氨乙基 γ 氨丙基甲基二甲氧基硅烷 (D4/APAEDMS)的本体开环共聚动力学 .在兼顾模拟精度与计算经济性基础上 ,模拟过程采用自由体积理论简化处理扩散效应并与本征反应动力学耦合 .本征动力学常数通过模拟主要共聚基元反应得到 ,基于优化的动力学常数通过模拟从分子水平揭示 :(1 )D4/APAEDMS本体开环共聚存在总活性基团的“稳态”行为 ;(2 )D4/APAEDMS本体 ...
    • D_4/N-β-氨乙基-γ-氨丙基甲基二甲氧基硅烷本体共聚反应聚合度变化的Monte Carlo模拟 

      罗正鸿; 李军; 詹晓力; 陈丰秋; 阳永荣 (2004-12-18)
      用MonteCarlo方法模拟八甲基环四硅氧烷 (D4 )与N β 氨乙基 γ 氨丙基甲基二甲氧基硅烷(APAEDMS)的本体开环共聚动力学 .模拟过程采用自由体积理论简化处理扩散效应并与本征反应动力学耦合 .本征动力学常数通过模拟主要共聚基元反应得到 ,基于优化的动力学常数通过模拟从分子水平揭示D4 APAEDMS本体开环共聚反应过程主要表现为活性阴离子聚合行为 ,同时又伴有部分逐步聚合特征 .
    • Dairy Milk Particles Made with a Mono-Disperse Droplet Spray Dryer (MDDSD) Investigated for the Effect of Fat 

      You, Xiang; Zhou, Zihao; Liao, Zhenkai; Che, Liming; Chen, Xiao Dong; Wu, Winston Duo; Woo, Mengwai; Selomulya, Cordelia; 车黎明; 陈晓东 (TAYLOR & FRANCIS INC, 2014-04-04)
      Mono-disperse droplet generation and subsequent drying in a spray-drying chamber, i.e., mono-disperse droplet spray dryer (MDDSD), provides a better-defined "flight experience" for liquid droplets. The related particle ...
    • Daptomycin antibiotic production processes in fed-batch fermentation by Streptomyces roseosporus NRRL11379 with precursor effect and medium optimization 

      Ng, I-Son; Ye, Chiming; Zhang, Zhixiang; Lu, Yinghua; Jing, Keju; 卢英华; 敬科举 (SPRINGER, 2014 MAR)
      Sodium decanoate was first found to be an effective precursor for synthesis of daptomycin from Streptomyces roseosporus NRRL11379 which was increased to 71.55-fold, compared with decanoic acid. The optimal flow rate of ...
    • De novo phenol bioproduction from glucose using biosensor-assisted microbial coculture engineering. 

      Guo Xiaoyun; Li Zhenghong; Wang Xiaonan; Wang Jing; Chala Juan; Lu Yinghua; Zhang Haoran (2019-11-14)
      Microbial biosynthesis has been extensively adapted for the production of commodity chemicals using renewable feedstocks. This study integrated metabolite biosensors into rationally designed microbial cocultures to achieve ...
    • Deactivation kinetics of sulfur poisoning of nickel catalyst during ethylbenzene hydrogenation 

      Zheng, Jinbao; Zhao, Yusheng; Yi, Xiaodong; Li, Qingbiao; Chen, Binghui; Fang, Weiping; 郑进保; 伊晓东; 李清彪; 陈秉辉; 方维平 (Chemical Industry Press, 2012, 十月)
      Based on the current power-kinetic model for catalyst deactivation, the apparent activity factor usually in a non-separable form was derived by taking the non-uniform distribution of catalyst active sites into account. ...
    • Deciphering simultaneous bioelectricity generation and dye decolorization using Proteus hauseri 

      Chen, Bor-Yann; Wang, Yu-Min; Ng, I-Son; 吴意珣; Liu, Shi-Qi; Hung, Jhao-Yin (SOC BIOSCIENCE BIOENGINEERING JAPAN, 2012-04)
      This first-attempt study disclosed how and why electron-shuttling mediators were capable to stimulate bioelectricity-generating capabilities of dye-bearing microbial fuel cells (MFCs) using Proteus hauseri. Due to significant ...
    • Deciphering simultaneous bioelectricity generation and reductive decolorization using mixed-culture microbial fuel cells in salty media 

      Chen, Bor-Yann; Hong, Junming; Ng, I. -Son; Wang, Yu-Min; Liu, Shi-Qi; Lin, Bing; Ni, Chao; 倪超 (ELSEVIER SCIENCE BV, 2013)
      This first-attempt study unveiled interactive characteristics of simultaneous bioelectricity generation and reductive decolorization (SBG&RD) of reactive blue 160 (RBul60) in air-cathode single chamber microbial fuel cells ...
    • Decolorization of textile azo dye and Congo red by an isolated strain of the dissimilatory manganese-reducing bacterium Shewanella xiamenensis BC01 

      Ng, I-Son; Chen, Tingting; Lin, Rong; Zhang, Xia; Ni, Chao; Sun, Dongzhe; 倪超; 林蓉; 张霞 (SPRINGER, 2014 March)
      Shewanella xiamenensis BC01 (SXM) was isolated from sediment collected off Xiamen, China and was identified based on the phylogenetic tree of 16S rRNA sequences and the gyrB gene. This strain showed high activity in the ...
    • Decoration of T-independent antigen with ligands for CD22 and Siglec-G can suppress immunity and induce B cell tolerance in vivo 

      Duong, B. H.; Tian, H.; Ota, T.; Completo, G.; Han, S. F.; Vela, J. L.; Ota, M.; Kubitz, M.; Bovin, N.; Paulson, J.; Nemazee, D.; 韩守法 (2010)
      Autoreactive B lymphocytes first encountering self-antigens in peripheral tissues are normally regulated by induction of anergy or apoptosis. According to the "two-signal" model, antigen recognition alone should render B ...
    • Defect influence on luminescence efficiency of GaN-based LEDs 

      Li, SP; Fang, ZL; Chen, HY; Li, JC; Chen, XH; Yuan, XL; Sekiguchi, T; Wang, QM; Kang, JY (2006-FEB-J)
      Wafers with normal light-emitting diode structure were grown by metal organic chemical vapor deposition system. The pressure and temperature were varied during growth of buffer layer in order to grow different types of ...
    • Defect-induced chemisorption of nitrogen oxides on (10,0) single-walled carbon nanotubes: Insights from density functional calculations 

      Tang, Shaobin; Cao, Zexing; 曹泽星 (AMER INST PHYSICS, 2009-09)
      The interactions of NOx (x=1,2,3) with the defective semiconducting (10,0) carbon nanotubes were studied by the density functional theory. Optimized geometries, binding energies, and electronic structures of the NOx-adsorbed ...
    • Degradation of ethidium bromide using CdTe quantum dots as photo-catalysts 

      Liu Ye; Xiang Rong; Huang Ju; Li Dong-Hui; 刘艳 (2008-01-28)
      CdTe quantum dots (QDs) were prepared in an aqueous solution using thioglycollic acid as a stabilizing agent. After an appropriate illumination and storage, the photoluminescence (PL) and stability of the CdTe nanoparticles ...
    • Dehydration of acetic acid by pervaporation using SPEK-C/PVA blend membranes 

      Chen, Jian Hua; Liu, Qing Lin; 刘庆林; Zhu, Ai Mei; 朱爱梅; Zhang, Qiu Gen (ELSEVIER SCIENCE BV, 2008-04)
      Sulfonated cardo polyetherketone (SPEK-C) and poly(vinyl alcohol) (PVA) blend membranes were prepared by solution casting method and used in pervaporation (PV) dehydration of acetic acid. The membranes were characterized ...
    • Dehydration of acetic acid using sulfonation cardo polyetherketone (SPEK-C) membranes 

      Chen, Jian Hua; Liu, Qing Lin; 刘庆林; Zhu, Ai Mei; 朱爱梅; Fang, Jun; 方军; Zhang, Qiu Gen (ELSEVIER SCIENCE BV, 2007-10)
      Homogeneous membranes based on sulfonated cardo polyetherketone (SPEK-C) were prepared. The membranes were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), differential scanning calorimetry ...
    • Dehydration of isopropanol by novel poly(vinyl alcohol)-silicone hybrid membranes 

      Zhang, Qiu Gen; Liu, Qing Lin; 刘庆林; Chen, Yu; Chen, Jian Hua (AMER CHEMICAL SOC, 2007-01)
      Novel organic-inorganic hybrid membranes were prepared through sol-gel reaction of poly(vinyl alcohol) (PVA) with gamma-aminopropyl-triethoxysilane (APTEOS). The membranes were characterized by FT-IR, solid-state NMR, WXRD, ...