具有边际贡献权重的位置值

先通过交流局势中交流结构的边邻接关系,确定了边邻接交流局势。再利用边邻接交流局势的Myerson值,以及边的端点的边际联盟贡献比例,定义了具有边际贡献权重的位置值。并利用分支有效性和边均衡贡献性,在一类交流局势下刻画了具有边际贡献权重的位置值。     

Synthesis and Structure of a Thiocyanato-Bridged One-Dimensional Cd<Superscript>II</Superscript> Coordination Polymer

Abstract  

Synthesis and structure of a new thiocyanato-bridged one-dimensional coordination polymer, [Cd(NCS)₂(TPPO)] _n (1, TPPO = triphenylphosphine oxide), have been described. The title compound crystallizes in the monoclinic P2₁/c space group with the unit cell parameters: a = 9.4917(4) ?, b = 22.2895(11) ?, c = 11.3300(5) ?, β = 117.433(3)°, V = 2127.49(17) ?³, and Z = 4. The single crystal X-ray diffraction revealed that the structure of 1 features thiocyanate bridges and 1D zigzag chains. The chains consist of thiocyanato-bridged five-coordinated Cd atoms. And the coordination fashion of thiocyanate group is different from the previous reported five-coordinated Cd-NCS systems.     

关于图K_(2n)-E(C_4)的点可区别边色数

图G的一个k-正常边染色f被称为点可区别边染色是指任何两点的点及其关联边的色集合不同,所用最小的正整数k被称为G的点可区别边色数,记为x′_(vd)(G).用K_(2n)-E(C_4)表示2n阶完全图删去其中一条4阶路的边后得到的图,文中得到了K_(2n)-E(_4)的点可区别边色数.     

Preparation of strong anion-exchange chromatographic packings based on monodisperse polymeric beads and their application in the separation of biopolymers

A new hydrophilic strong anion-exchange (SAX) stationary phase for HPLC has been synthesized by chemical modification of macroporous 8.0-m monodisperse poly(glycidylmethacrylate-co-ethylenedimethacrylate) beads (P_GMA/EDMA). The stationary phase was evaluated in detail to determine its ion-exchange properties, separability, reproducibility, hydrophilicity, and the effect of column loading and pH on the separation and retention of proteins. It was found to have an ion-exchange chromatographic (IEC) retention mechanism. The highest dynamic protein loading capacity of the synthesized SAX packing for BSA was 22.6 mg g^–1. Five proteins were separated within 6.0 min using the synthesized SAX resin. The SAX resin was also used for rapid separation and purification of recombinant human stem cell factor (rhSCF) from a crude extract solution in only one step. The purity of the purified of rhSCF was >92.4%.     

反相高效液相色谱法同时测定苦豆子及其制剂中苦参碱和氧化苦参碱

建立了用反相高效液相色谱法测定苦豆子及其制剂中苦参碱和氧化苦参碱的方法。色谱条件：ＯＤＳ柱，甲醇－水－三乙胺，φ（甲醇）＝０．５５，φ（三乙胺）＝０．０００２为流动相，紫外检测波长２１５ｍｍ。为苦豆子及共制剂的质量评价提供了一种方法     

反相高效液相色谱法测定三种中药中粉防己碱

本文首次用反相高效相色谱法分离并测定了粉防己，头花千金藤，蝙蝠葛三种中药中的粉防己碱，建立了中粉防己碱分离，测定了色谱方法，色谱条件：ＯＤＳ柱，甲醇－水－三乙胺（８５：１５：０．２５Ｖ／Ｖ）为流动相，紫外检测器测波长２８３ｎｍ。本研究的扩大中药及植物中粉防己碱药物资源的开发提供了简便，灵敏，准确的分离，测定方法。     

反相高效液相色谱法同时测定苦豆子及其制剂中苦参碱和氧化苦参碱

建立了用反相高效液相色谱法测定苦豆子及其制剂中苦参碱和氧化苦参碱的方法。为苦豆子及其制剂的质量评价提供了一种方法。     

手性1,3,4-噁二唑硫醚衍生物的合成

以5-取代-2-巯基-1,3,4-噁二唑为亲核试剂,与手性5-烷氧基-3,4-二溴-2(5H)-呋喃酮发生Michael反应,合成了6种新的手性1,3,4-噁二唑硫醚衍生物(产率55%～67%),其结构经1H NMR, 13C NMR, IR和HR-MS确证.     

反相高效液相色谱法测定狼把草中的木犀草素

胜反相高效液相色谱法分离并测定了狼把草中的木犀草素，建立了该中药中木犀草素分离，测定的色谱方法。     

Determination of trace europium(III) based on a new fluorescence enhancement system of europium(III) with N,N′-<Emphasis Type="Italic">bis</Emphasis>-(4-N-aminothiourea-2-amylidene)-4,4′-diaminodiphenyl sulfone by EDTA or alumin in N,N-dimethylformamide

A new bis-Schiff base ligand, N,N-bis-(4-N-aminothiourea-2-amylidene)-4,4-diaminodiphenyl sulfone (ARADS), was synthesized. The solutions of its complex with Eu³⁺ in DMF can emit the intrinsic fluorescence of Eu³⁺. The fluorescence intensity of the complex was enhanced 20–30-fold in the presence of EDTA (or alum). The influence of seven kinds of solvents (DMF, CH₃CN, THF, acetone, CH₃OH, C₂H₅OH, and DMSO) on the intensity of fluorescence was studied. The results showed that the Eu³⁺-ARADS-EDTA (or alum) system emits its strongest fluorescence in DMF. Thus, the system can be used to develop a new method for the determination of europium(III). The excitation and emission wavelengths are 395 and 615 nm, respectively. Under optimal conditions, the fluorescence intensities vary linearly with the concentration of Eu³⁺ in the range 6.0 × 10^–10–5.2 × 10^–5 mol/L, with a detection limit of 5.0 × 10^–10 mol/L. The interference from some rare earth metals and other inorganic ions are described. The method is a selective, sensitive, rapid, and simple analytical procedure for the determination of europium(III) in high-purity yttrium oxide and synthetic samples. The mechanism of fluorescence enhancement was also studied.__________From Zhurnal Analiticheskoi Khimii, Vol. 60, No. 4, 2005, pp. 372–377.Original English Text Copyright © 2005 by Tianlin Yang, Wenwu Qin, and Weisheng Liu.The article was submitted by the authors in English.