三维含时量子散射研究H+ClH体系

用三维含时量子散射理论模拟了H+GlH体系在BW2,mBW2,G3势能面上的动力学行为.其计算结果表明,振动量子态对反应几率影响很大;势能面的地形对转动量子态如何影响反应几率起重要作用;反应几率表现出"黄金规则".此外,BW2,mBW2势能面上的反应几率几乎相同,而G3势能面上的反应几率较前者低,大概由于G3的势垒高的缘故.     

Interaction between N-Phospho-Amino Acids and Nucleoside in Aqueous Medium

Thebiosynthesisofnucleicacid,oneofthemostimportantbio-macromolecules,isahighlyelegantprocess,whichinvolvestheparticipationofmanyenzymesandenergycarriers,suchasATP',whilechemicalsynthesisofoligonucleotidesgenerallyinvolvescomplicatedprotectinganddeprotectingprocesses'.Inthepreviouswork,nucleotidesandoligonucleotidesweredirectlyformedacthereaction,,-ofN-(O,O-diisopropyl)phosphorylthreonineanduridineinanhydrouspyridine'.SoN-(O,O-diisopropyl)phospho-aminoacid(DIPP-aa)wasproposedasamodelcompou…     

遵照国家法制规定大力开发强化食品

介绍了我国食品营养强化剂使用卫生标准,特别是对其中一些重要备注和规定进行了归纳和说明.     

类金刚石薄膜碲镉汞红外器件钝化膜的研究

采用等离子增强化学气相法(PECVD)在碲镉汞(MCT)衬底上沉积出纳米团聚的类金刚石薄膜(DLC).用原子力显微镜(AFM )和侧向力显微镜(LFM)对DLC和MCT表面形貌进行表征;用俄歇电子能谱(AES)对DLC/MCT界面附近各元素含量的分布进行分析研究.结果表明:当膜厚达到25nm以上,这种DLC膜就能够有效地抑制MCT中HgTe的分解和Hg与Te的外扩散.AFM 和LFM的观察结果表明,原始MCT晶片经100℃在氮气气氛中退火30min,表面区域出现了不同与MCT的微米量级的新相,而由DLC膜保护的MCT晶片表面就没有观察到这种由分解反应引起的相变.     

[100]定向织构生长金刚石薄膜的红外光学性能研究

采用微波等离子增强化学气相沉积法在(100)镜面抛光的硅片衬底上实现了金刚石薄片[100]定向织构生长.并用扫描电子显微镜、拉曼散射和傅立叶红外光谱仪分析测试了不同工艺得到的金刚石薄片的表面形貌、组成结构和红外性能.结果表明:负偏压辅助定向成核和氢的等离子刻蚀不仅促进了金刚石薄膜的定向织构生长,而且还能刻蚀成核期的非金刚石成分.从而提高了金刚石薄片的红外光透过特性.     

单重态CCl~2与O~3反应的热力学及动力学性质研究

在量化计算的基础上运用统计热力学和Wigner校正的Eyring过渡态理论研究了不同温度下单重态CCl~2和臭氧O~3反应的热力学及动力学性质。计算结果表明该反应在低温下具有热力学优势,而在高温下具有动力学优势。     

LC-MS analysis of the formed peptides from N-(O,O-diiso-propyl)phosphoryl aspartic acid

LC-ESI-MS method was used to analyze the formed di-and tri-peptide hi the reaction system of N-(O,O-diisopropyl)phosphoryl aspartic acid and adenosine.Ouster ions of the peptides were given hi the ESI-MS.The structures of these small peptides were confirmed by LC-MS-MS analysis.Compared with the traditional HPLC-UV detection,this method showed good sensitivity and selectivity for peptide in the presence of compounds with strong UV absorption,such as nucle-oside and nucleotide.     

锇-聚乙烯吲哚配合物修饰电极对肾上腺素的电催化氧化

研究了配位聚合物锇 -聚乙烯吲哚 [Os( bpy) 2 ( PVI) 1 0 Cl]Cl和 Nafion双层膜修饰玻碳电极的电化学特性 ,该膜对肾上腺素 ( EP)的电化学氧化有催化作用 ,在通常的生理条件下 ( p H7.0 ) ,催化电流与 EP浓度在1 .0× 1 0 - 6～ 8.6× 1 0 - 5 mol/L范围内呈良好的线性关系 ,相关系数为 0 .9987.Nafion膜排除了抗坏血酸( AA)的干扰 ,表现出较高的灵敏度、选择性及良好的稳定性 .该电极可在 +2 50 m V下进行 EP的安培法测定 .用旋转圆盘电极对电催化过程的动力学进行了研究 ,催化速率常数 kch为 3 .53× 1 0 3mol- 1 · L· s- 1 .在较高 EP浓度下 ,催化电流与浓度的关系表现出 Michaelis-Menten型响应 ,Michaelis-Menten常数 Km 为1 .4 7mmol/L.     

Synthesis and Theoretical Studies of Phosphoryl Amino Acid Analogue

Phosphoryl amino acids and their analogues are continuing to be increasingly important as potential enzyme inhibitors, mechanistic probes for proteases^[1,2]. Previously, a series of investigations on the structure-reactivity relationship about phosphoryl amino acids 1 had been carried out, the results showed that the co-participation of phosphoryl group, carboxyl group and residues of amino acids were essential and their biomimic reaction mechanisms were commonly through a penta-coordinate intramolecular mixed carboxylic-phosphoric anhydride intermediates^[3].     

Localization of s-Wave and Quantum Effective Potential of a Quasi-free Particle with Position-Dependent Mass

The properties of the 8-wave for a quasl-free partide with position-dependent mass （PDM） have been discussed in details. Differed from the system with constant mass in which the localization of the s-wave for the free quantum particle around the origin only occurs in two dimensions, the quasi-free particle with PDM can experience attractive forces in D dimensions except D = 1 when its mass function satisfies some conditions. The effective mass of a particle varying with its position can induce effective interaction, which may be attractive in some cases. The analytical expressions of the eigenfunctions and the corresponding probability densities for the 8-waves of the two- and three-dimensional systems with a special PDM are given, and the existences of localization around the origin for these systems are shown.