Tb3+ as Fluorescent Probe in the Study of the Interaction of Other Lanthanide Ions with Trichosanthin

The interaction of lanthanide (Ln³⁺)ions with trchosanthin(TCS)was investi-gated using Tb³⁺ as fluorescent probe.The metal-binding sites of the protein were probed by means of adding the Tb³⁺ into the protein solutions.If other Ln³⁺ ions exist in the Tb³⁺ protein complex system, they would compete against Tb³⁺ in the binding sites of the protein, and so the fluorescence intensity of Tb³⁺ decreased,which is called quenching effect.The quencliing effect is related to the ionic radii of the Ln³⁺ ions and energy transfer from Tb³⁺ protein to Ln³⁺ ions.Based on the ex-perimental results,a schematic of the energy transfer from protein-Tb³⁺ complex to protein-Ln³⁺ complex is suggested.     

磺化酞菁镓的二聚现象研究

采用分光光度法研究了磺化酞菁镓的二聚现象;测定了二聚常数k_d,讨论了PH值、离子强度、水、温度等因素对k_d的影响,研究结果表明:磺化酞菁镓的二聚反应可表示成:2SPcGaOH⇔(SPcGa)₂O+H₂O 且磺化酞菁镓的二聚常数随着离子强度、磺酸基数目、水的浓度的增加而增加。     

Ca2+,Th4+和抗磁稀土离子与2,3-二羟基-对-二甲苯胺四乙酸的成络作用

本文用¹H NMR和UV VIS光谱技术研究了DPTA与Ca⁺²、Th⁴⁺和抗磁稀土离子Ia³⁺、Lu³⁺、Y³⁺、Sc³⁺的成络作用,发现配体与抗磁稀土离子为慢交换体系,而与Ca²⁺为快交换体系。确定了络合物的组成,Th⁴⁺与试剂生成1:2络合物,Ca²⁺、La³⁺、Lu³⁺、Y³⁺、Sc³⁺主要生成1:1络合物。络合物组成与溶液pH有关。     

THE SYSTEMATIC CALCULATIONS OF (n,2n) AND (n,3n) REACTION CROSS SECTIONS FOR MEDIUM-HEAVY NUCLEI AT 14.5MeV

The (n,2n) and (n,3n) reaction processes have been studied by mechanism analysis of the neutron-induced nuclear reactions,formulae for evaluating the reduced cross section have been given.The cross sections of 14.5MeV (n,2n),(n,3n) reactions have been calculated according to the systematic method for Z=58—83 about 53 nuclei.A good agreement between the results of the systematic calculations and the experimental data has been reached.     

茚苯胺青色染料光退色的研究

本文研究了一系列茚苯胺青影像染料的光退色动力学和光退色机理。实验结果表明,这些染料在醋酸丁酯溶液中的光退色符合一级反应动力学。茚苯胺染料光退色过程中存在光氧化反应。用改进的PPP-CI方法计算染料分子的跃迁能和电荷密度,结果表明,茚苯胺染料的光退色速率与染料分子中某些原子上的电荷密度有关,单重态氧可能在光退色过程中起着重要作用。     

3,6-双-O-乙酰膜荚黄芪苷元的晶体和分子结构

3,6-双-O-乙酰膜荚黄芪苷元,C~34H~54O~7,属单斜晶系,空间群P2~1晶胞参数为a=10.902(4),b=17.048(6),c=8.938(3)A,β=107.99(3),V=1580(1)A^3,Z=2,D0=1.21g.cm^-3,D~m=1.18g.cm^-3.结构由直接法解出,对2253个可观察衍射计算,R=0.061,Rw=0.068.结构测定表明,20-C和24-C的构型为R和S,C(16)的羟基上氢原子H(05)与C(25)的羟基上氧原子O(7)形成分子内氢键O(5)-H(05)...(7),同时H(07)与另一个分子的羰基上氧O(2)形成分子间氢键O(7)-H(07)...O(2),通过分子间氢键,晶体中分子形成链状结构.     

悬浮法生产可发性聚苯乙烯(EPS)虚拟仿真实验平台的设计与开发

为实现我校高分子材料与工程专业人才培养目标,即培养高素质工程应用型人才,弥补教学过程中实际操作的缺陷与不足,我们开发了基于实际工业生产的悬浮法生产可发性聚苯乙烯的虚拟仿真实验平台.详述了该平台的设计开发思路与理念,平台主题结构,以及实验主控界面设计思路和主要内容.实践证明,该平台不仅包含工程应用的相关知识,而且极大的提...     

NUMERICAL STUDIES OF THE IRREVERSIBILITY AND THE ANISOTROPY FIELDS IN A DM SPIN GLASS

The numerical simulation of the irreversiblity of magnetization and the anisotropy field is studied in a spin glass with RXKY and DM interactions, It is found that the anisotropy field increases linearly with the concentration of nonmagnetic impurities, but the remanent magnetization and the saturation remain unchanged with different concentrations. A comparison is made with experiment.     

电子回旋共振等离子体特性及其对生长氮化镓晶膜的影响

为了解并优化在电子回旋共振等离子体辅助化学汽相沉积GaN晶膜的工艺研究中的等离子体特性,利用朗缪尔探针及法拉第筒系统地测量了离子密度(N_i)、等离子体势(V_p)、电子温度(T_e)及离子流强(J_i)等多个等离子体参量随微波功率(P_w)及沉膜室气压(p)变化的关系.给出了在P_w＝850W,p＝0.22Pa时,上述等离子体参量的轴向及径向分布.GaN晶膜的生长速率、电学及晶体学性能 关键词：     

离子注入对C60薄膜结构的影响

利用高能离子注入技术系统地研究了不同剂量、不同种类离子注入对C₆₀薄膜结构的影响,并利用Raman光谱对其结构进行分析．结果表明：中等能量的离子注入会影响C₆₀薄膜的结构,使C₆₀分子薄膜产生聚合和非晶碳化现象,但上述现象的出现与注入离子的剂量大小有关,并存在一注量阈值,只有在此阈值之上,C₆₀薄膜结构才发生改变,研究表明这与注入离子同C₆₀分子之间互作用方式有关.