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991.
Shu-guang Yang Yong-jun Zhang Xin-hua Dai Wen-hong Tang Chun-yan Liu Wei-xiao Cao Yu-liang Li Jian Xu State Key Laboratory of Polymer Physics Chemistry Institute of Chemistry Chinese Academy of Sciences Beijing China Technology Institute of Physics Chemistry Chinese Academy of Sciences Beijing China College of Chemistry Molecular Engineering Peking University Beijing China 《高分子科学》2002,(6):591-593
Electrostatic layer-by-layer self-assembly multilayer films were successfully fabricated from C_(60)-ethylenediamineadduct (C_(60)-EDA) and DNA. Under visible light irradiation, DNA is ready to be cleaved and the films are destroyed. 相似文献
992.
在深入研究中药微量元素含量区间尺的基础上,从统计学角度对区间尺的最佳分级问题作了详细探讨,提出用5级区间尺来衡量中药中不同元素含量间相对高低水平,理论上更合理。 相似文献
993.
Yu Tang 《Tetrahedron letters》2006,47(23):3823-3825
5-Endo iodocyclization of various β,γ-unsaturated amides proceeded smoothly to give the corresponding conjugated iminolactones exclusively in satisfactory yields with the use of tBuOCl and I2 as the reagents, which proved to be much advantageous over the conventional I2/NaHCO3. 相似文献
994.
Yunyu Yi Ronald Neufeld Selim Kermasha 《Journal of Sol-Gel Science and Technology》2006,38(3):251-259
Entrapment of membrane proteins is a challenging task compared to that involving soluble proteins. Chlorophyllase, a membrane
protein, was successfully entrapped in tetramethoxysilane-derived sol-gel. Pre-gel sol typically consists of an aqueous suspension
of chlorophyllase, precursors including tetramethoxysilane and/or methytrimethoxysilane, and sodium fluoride as catalyst.
To obtain a highly active entrapped enzyme preparation, the effects of various immobilization parameters, including the chemical
compositions of pre-gel sol (water/silane ratio, precursor type and proportions, enzyme loading, sodium fluoride concentration),
and sol-gel process parameters (aging and drying time and approach) have been investigated. Chlorophyllase demonstrated the
highest activity in gel derived from a pre-gel sol with water/silane ratio of 30 and enzyme loading of 0.257 mgprotein/ggel, and showed moderately lower activity in organically modified sol-gel than that in hydrophilic sol-gel. The effects of water/silane
ratio and precursor combinations on the activity of entrapped chlorophyllase were also studied by examining the pore morphology
of gel via nitrogen adsorption-desorption. Longer aging time leads to an entrapped chlorophyllase preparation with higher
activity. Chlorophyllase preparation demonstrated negligible activity after air-drying for 12 h while lyophilized chlorophyllase
preparation demonstrated 8, 4 and 4 times higher activity than air-dried, vacuum-dried and solvent-dried preparations. Chlorophyllase
demonstrated 30% higher activity in the improved sol-gel protocol than that from a non-optimized sol-gel protocol developed
in a previous study. 相似文献
995.
996.
尖晶石型LiMn2O4电池材料的元素掺杂 总被引:4,自引:0,他引:4
尖晶石型LiMn2O4正极材料因资源丰富、无毒、安全及制备简单、技术较成熟等优点而成为最具竞争力的新一代商用锂离子二次电池的正极材料之一.由于LiMn2O4的循环稳定性、高温(>55℃)稳定性和大电流放电等因素限制了推广应用.本文从材料的结构组成对锂离子嵌脱过程的作用机理,论述了元素掺杂对尖晶石型LiMn2O4正极材料电化学特性的影响,指出了元素掺杂本体改性锰酸锂正极材料的方法和特点. 相似文献
997.
锆助剂对低温液相合成甲醇用铜铬硅催化剂性能的影响 总被引:3,自引:2,他引:3
考察了含锆的铜铬硅催化剂低温液相合成甲醇性能,并进行了BET、TPR-H2、TPD-H2、TPD-CO、XRD和XPS表征。结果表明,锆作为结构助剂及电子助剂对催化剂在低温液相合成甲醇反应中具有显著的促进作用,反应活性可提高32.25 %。锆助剂能有效提高催化剂的比表面积,促进催化剂中铜铬组分的分散及表面富集。ZrO2加入在催化剂表面产生的Cu+与催化活性的改善密切相关,Zr4+、Cr3+、Cu+可形成复合中心,为价态的稳定性提供微环境,在H2活化及C O键的断裂等反应步骤中起重要作用。 相似文献
998.
SYNTHESIS OF HYPERBRANCHED CONJUGATIVE POLY(ARYLENEETHYNYLENE)S BY ALKYNE POLYCYCLOTRIMERIZATION 总被引:2,自引:0,他引:2
A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All thereactions proceed smoothly and soluble polymers of high molecular weights(M_w up to 3.8×10~4)are obtained in high yields(up to 97%). 相似文献
999.
高速逆流色谱与质谱联用在中药分析中的应用 总被引:10,自引:0,他引:10
高速逆流色谱 ( High- speed countercurrent chromatography,HSCCC)是新型的液 -液分配色谱技术 ,它利用多层螺旋管同步行星式离心运动 ,在短时间内实现样品在互不相溶的两相溶剂系统中的高效分配 ,从而实现样品分离[1] . HSCCC分离纯化后 ,若用 MS离线检测 ,此时须挥发原 HSCCC的溶剂体系 ,才能实现样品转移 ,还可能会带来样品污染 .HSCCC与 MS的联用克服了这些缺陷 ,具有很强的实用价值 .丹参酮 A( Tashinone A)是一种结晶性菲醌类化合物 [2 ] ,在丹参乙醚提取物中含量丰富 .本文采用正己烷 -乙醚 -乙醇 -水体系 ,将 HSCC… 相似文献
1000.
A capillary electrophoretic assay for determining aloe-emodin (AE), methyl p-coumarate (MC), and 3,4-dihydro-6,8-dihydroxyl-[(3s)-2'-acetyl-3'-hydroxyl-5'-methoxy-benzyl]-isocoumarin (DDI) in Aloe vera has been developed. Baseline separation was achieved within 15 min using a running buffer of 20 mm borax containing 10% (v/v) acetonitrile at pH 10.5. A linear relationship between the peak area and the concentration of the analytes was found in the ranges 5-500, 10-1000 and 2-1000 micro g/mL for AE, MC and DDI, respectively, with correlation coefficients of 0.9992-0.9998. The relative standard deviations of migration time and peak area were within 0.17-0.19 and 1.52-3.37%, respectively. The recoveries of AE, MC and DDI were 105, 102 and 96.4%. The contents of AE, MC and DDI in Aloe vera were measured to be 5.13, 0.768 and 1.30 mg/g, respectively. 相似文献