吖啶橙与表面活性剂的作用及其在测定蛋白质中的应用

运用紫外光谱法和荧光光谱法研究了染料吖啶橙中加入表面活性剂十二烷基苯磺酸钠以及牛血清白蛋白后紫外光谱和荧光光谱的变化情况。以吖啶橙在十二烷基苯磺酸钠中生成的二聚体作为荧光探针,讨论了与牛血清白蛋白相互作用情况。采用荧光呈现法对牛血清白蛋白进行了测定,结果表明,该方法反应灵敏,速度快,线性范围为0～4.17×10-7 mol·L-1, 相对标准偏差为1.9%, 检出限为8.73×10-10 mol·L-1。     

乙烷选择氧化制乙酸的研究进展

乙烷选择氧化制乙酸是缓解资源短缺、实现低碳烷烃高附加值利用的重要技术.该反应常用的催化剂有杂多酸、钒磷氧化物以及多金属氧化物,其中多金属氧化物催化剂,尤其是Mo-V体系,由于具有高的热稳定性和好的催化活性被广泛研究.我们从催化剂的性质、反应动力学及反应机理方面综述了 Mo-V催化剂在乙烷选择氧化制乙酸方面的研究进展.     

Preparation, Characterization of Hydrotalcites and the Catalytic Properties in Synthesis of o-Phenylphenol over Pt／CHT

Mg/Al mixed oxides with molar ratios of 2-6 of Mg to Al used as supports for platinum catalysts were obtained by the thermal decomposition method. The effect of the composition of the mixed oxides on the physicochemical properties was studied by TPD, nitrogen sorption, XRD and TG-DTA characterization methods. The synthesis of o-phenylphenol (OPP) from a dimer (obtained from cyclohexanone condensation) was investigated over Pt/CHT catalysts and compared with those over Pt/MgO and Pt/Al2O3 catalysts. These catalysts show a high activity and selectivity for OPP, with a conversion reaching 93.8% and a selectivity reaching 87.9% in some experiments. For Pt/CHTx catalysts, the calcined hydrotalcites exhibited strong base sites, which were necessary to catalyze the synthesis of OPP.     

刚体瞬心迹的演示与仪器设计

本文介绍的瞬心迹演示仪可以在两种常见情况下，借助投影仪直观地显示本体极迹在空间极迹上作无滑动滚动的动态。     

Exact dimer statistics and characteristic polynomials of cacti lattices

Summary The pruning method developed earlier by one of the authors (K.B.) combined with the operator method is shown to yield powerful recursive relations for generating functions for dimer statistics and characteristic polynomials of cacti graphs and cacti lattices. The method developed is applied to linear cacti, Bethe cacti of any length containing rings of any size, and cyclic cacti of any length and size. It is shown that exact dimer statistics can be done on any cactus lattice.Dedicated to Professor V. Krishnamurthy on the occasion of his 60th birthdayAlfred P. Sloan fellow; Camille and Henry Dreyfus teacher-scholar     

金银合金纳米笼二聚体光学性质的研究

本文采用有限元方法研究了金银合金纳米笼二聚体的光学性质。结果发现,二聚体的吸收和散射效率对入射光的偏振方向有很强的依赖性,当光偏振方向沿着二聚体的长轴方向时,偶极子模式分成两个模式:键合模式和反键合模式,前一种模式的频带比纳米笼单体的共振频带低,而后一种模式的频带比纳米笼单体的共振频带高。此外,二聚体的等离子体性质还取决于两个纳米笼之间的距离,距离越小,等离子体模式红移越大。     

Synthesis of a transition-metalated phosphinoborane dimer

The unprecedented aggregate of a transition-metalated phosphinoborane was reported. Cp(CO)₂Fe{P(BCl₃)HPh} was treated with n-BuLi to yield the iron-phosphinoborane dimer, [Cp(CO)₂Fe{P(μ-BCl₂)Ph}]₂, via a dehydrohalogenation reaction. The X-ray structural study revealed that the dimer has a bent P₂B₂ 4-membered ring with two iron complex fragments in equatorial positions.     

Two centre continuum Coulomb wavefunctions in the entire complex plane

We solve the Schrödinger Equation for an electron moving in the Coulomb field of two charged nuclei. We take proper account of the analytic structure of the solutions and thus determine their mathematical form in the entire complex plane. These general solutions are then used to construct the two-centre analogue of the usual one-centre Coulomb wavefunctions.This work was supported by the Bundesministerium für Forschung und Technologie (BMFT), and by the Gesellschaft für Schwerionenforschung (GSI).     

The two-electron integral transformation and two-body density matrix transformation

Ann ⁵ algorithm for the transformation of quantum-mechanical four centre functions is presented in a form best suited for computers having a virtual memory capability. Part of the work to be submitted for the degree of Ph. D. in the University of Newcastle-upon-Tyne.     

四-4-(2-正丁氧基乙氧基-羰基)酞菁铜(Ⅱ)在四氢呋喃和氯仿中的二聚物

本文通过对四-4-(2-正丁氧基乙氧基-羰基)酞菁铜(Ⅱ)在THF和CHCl_3溶液可见光谱的分析表征了它在一定的浓度范围(10~(-7)～10~(-5)mol/L)存在单分子和双分子聚集态之间的动态平衡。在THF和CHCl_3溶液中,双分子二聚物的离解常数K_d=C~2m/C_D分别是2.08(±0.05)×10~(-6)mol/L和1.10(±0.06)×10~(-6)mol/L。利用作图法,绘制出纯单分子和纯二聚物的可见光谱图。最后,对两种溶液可见光谱的区别进行了讨论。