Effect of C layer on the structures and magnetic properties of (0 0 1)-oriented [C/CoPt]n/Ag films

CoPt/Ag and [C/CoPt]n/Ag thin films have been prepared onto the glass substrates by magnetron sputtering. We investigated the evolution of texture and magnetic properties of CoPt/Ag and [C/CoPt]n/Ag films. The results show that C-doping plays an important role in improving (0 0 1) texture, improving the order parameter S, reducing the intergrain interactions, and making the magnetization reversal mechanism more close to Stoner-Wolfarth rotational mechanism. The growth mechanism of (0 0 1) texture also seems to be related strongly to the films thickness. Our results show that the highly (0 0 1)-oriented films with ordered fct phase have a significant potential for the perpendicular media of extremely high-density recording.     

火焰原子吸收法测定霞石中的氧化钾和氧化钠

本方法用于测定霞石中的钾、钠，主要通过在溶样时加入氢氟酸除去二氧化硅，调整溶液中钾、钠的含量，消除互相之间的干扰，加入氯化铯消除电离因素的干扰，提高了分析结果的准确性和重现性，使测定结果更接近化学分析值。回收率为99．2％-101．6％。     

接枝羧基的有限长碳纳米管电子结构的第一性原理研究

基于局域密度泛函理论，采用第一性原理方法，建立了对(5,5)型和(9,0)型有限长碳纳米管接枝羧基官能团的原子模型，通过计算其电子分布和态密度的变化，讨论羧基官能团对碳纳米管电子结构和电子输运特性的影响. 计算表明，接枝羧基的碳纳米管,其电子结构明显改变，其费米能级上的电子态密度下降；最高占据轨道上的非定域程度减弱,致使电子输运性能呈下降趋势. 关键词： 碳纳米管 密度泛函理论 电子结构     

蚕蛹甲壳素的脱色方法与机理探讨

研究了从粗甲壳素 (分离蚕蛹蛋白质后的残渣 )中提取蚕蛹甲壳素的工艺条件 ,探索了H2 O2 氧化脱色方法。实验结果表明 ,在 70℃的水浴中 ,按照m(蚕蛹渣 )∶m(5 %氢氧化钠 ) =30∶80的质量比处理 2h ,可脱净残余蛋白 ,得到黑褐色的粗蚕蛹甲壳素。用H2 O2 脱色漂白 ,工艺条件为 :6 5～ 70℃ ,pH值为 8 5± 0 5 ,时间 5h ,m (蚕蛹渣 )∶m(30 %H2 O2 ) =5 0∶130。所得甲壳素白度为 30 % ,收率为 2 5 %。双氧水脱除蚕蛹甲壳素颜色的机理可能是H2 O2 分解的O2 -2 作用于铁硫蛋白与细胞色素复合物体系中的硫 ,将体系中半胱氨酸硫氧化成亚砜 ,使得色蛋白与甲壳素相连的键断开 ,从而使色素从甲壳素上分离下来。     

无溶剂一锅法合成1,4-二氢吡啶

碳酸氢铵、醛和1, 3-二羰基化合物于70 ℃无溶剂条件下缩合以86～97%的产率得到1, 4-二氢吡啶.     

Ce(III)在辣根体中的迁移

应用放射性同位素示踪法, 即结合放射自显影和液体闪烁器检测及电镜放射自显影技术, 首次定性、定量地研究Ce(III)离子在辣根植物中的迁移. 结果表明: (1) Ce(III)离子能被辣根植物吸收并随时间发生迁移; (2)电镜放射自显影结果显示, Ce(III)离子迁移是通过质外体至共质体进入细胞的. Ce(III)离子在辣根植物体中的行为, 为稀土离子植物环境效应机理及辣根植物安全防护提供借鉴.     

A New 4.0-Generation Dendrimer Phosphorescence Labeling Reagent and Its Application to Determination of Trace Alkaline Phosphatase by Affinity Adsorption Solid Substrate-room Temperature Phosphorimetry

A Triton X-100-4.0G-D （4.0G-D refers to a 4.0-generation dendrimer） was brought forward as a new phosphorescence labeling reagent. Two types of specific affinity adsorption （AA） reactions （direct method and sandwich method） were carried out between the labeling product of Triton X-100-4：0G-D-Wheat germ agglutinin （WGA） and alkaline phosphatase （ALP）, the product of AA reaction preserved the good characteristics of room temperature phosphorescence （RTP） of 4.0G-D and △Ip of the product was proportional to the content of ALP. According to the fact stated above, a new method for the determination of trace ALP by affinity adsorption solid substrate-room temperature phosphorimetry （AA-SS-RTP） was established on the basis of WGA labeled with the Triton X-100-4.0G-D. The detection limits were 0.20 ag·spot^-1 （corresponding concentration： 5.0×10^-16 g·mL^-1, namely 5.0×10^-18 mol·L^-1） for a direct method and 0.14 ag·spot^-1 （corresponding concentration： 3.5×10^-16 g·mL^-1, namely 3.5×10^-18 mol·L^-1） for a sandwich method, respectively. For their high sensitivity, good repeatability and high accuracy, the direct method and sandwich method have been successfully appfied to determine the content of ALP in human serum, and the results were coincided with the clinical detection results of the enzyme-linked immunosorbent assay method by the Zhangzhou Hospital of Traditional Chinese Medicine. Meanwhile, the mechanism for the determination of trace ALP by AA-SS-RTP was discussed.     

Synthesis,structure and DNA-binding studies on the 2-(3-chlorophenyl)imidazo[4,5-f]1,10-phenanthroline-bis(2,2′-bipy ridine)-ruthenium(II) complex

A new polypyridyl ligand, MCP {MCP = 2-(3-chlorophenyl)imidazo[4,5-f]1,10-phenanthroline} and its ruthenium(II) complex, [Ru(bpy)2(MCP)](ClO4)2· 0.5MeCN (bpy = 2,2-bipyridine), have been synthesized and characterized. The structure of the complex was determined by single crystal X-ray diffraction techniques. The MCP ligand is essentially planar and the stacking interactions between the ligands were observed in the crystal. [Ru(bpy)2(MCP)]2+ can strongly bind to Calf thymus DNA through intercalation of MCP ligand. The Cl substitute group has no significant effect on the spectral properties and DNA-binding behaviour of the complex.     

双核磺化酞菁铜(Ⅱ)催化氧化α-萘酚

本文研究了以乙醇为溶剂,CaCl_2为助催化剂,双核磺化酞菁铜(Ⅱ)催化氧化α-萘酚制备α-萘醌的各种因素。提出了可能的反应机理。