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91.
报道了有机化合物极谱催化波的一种新类型--缔合/平行催化氢波.研究麦迪霉素-H2O2体系缔合/平行催化氢波的结果表明,质子化麦迪霉素与H2O2形成缔合物,引起峰电位负移;麦迪霉素催化氢波被H2O2还原中间产物羟基自由基进一步催化,使峰电流显著增加.求得麦迪霉素-H2O2缔合物的缔合比为1:1,表观缔合常数为7.18.在0.15 mol·L-1 KH2PO4-NaOH (pH 7.4)-0.02 mol·L-1 H2O2支持电解质中,-1.59 V (vs. SCE)处的缔合/平行催化氢波二阶导数峰峰电流与麦迪霉素浓度在2.0×10-8~1.0×10-5 mol·L-1范围内呈线性关系,检测限为6×10-9 mol·L-1.与麦迪霉素的催化氢波相比,该缔合/平行催化氢波提高分析灵敏度两个数量级. 相似文献
92.
Ion association between inorganic anions and symmetrical tetraalkylammonium ions, R4N+ (R = Me, Et, Pr, n-Bu, n-Am, and 2-methyl butyl {isoamyl = iAm}) was investigated using ordinary silica capillary by capillary zone electrophoresis. An improved version of the Williams-Vigh method was used for the first time to measure the mobilities of the inorganic anions. Plots of log Kass against log dielectric constant in various media, revealed a smaller change in Kass compared to dielectric constant. These plots suggest that the Bjerrum's equation is inadequate in accounting for the associations of ions in a CZE setup. 相似文献
93.
A. Moghimi Sh. Sheshmani A. Shokrollahi H. Aghabozorg M. Shamsipur G. Kickelbick M. Carla Aragoni V. Lippolis 《无机化学与普通化学杂志》2004,630(4):617-624
A novel 1:2 proton transfer self‐associated compound LH2 , (GH+)2(pydc2—), was synthesized from the reaction of dipicolinic acid, pydcH2, (2, 6‐pyridinedicarboxylic acid), and guanidine hydrochloride, (GH+)(Cl—). The characterization was performed using IR, 1H and 13C NMR spectroscopy and single‐crystal X‐ray diffraction. LH2 · H2O crystallizes in the space group C2/c of the monoclinic system and contains eight molecules per unit cell. The unit cell dimensions are: a = 26.480(5)Å, b = 8.055(2)Å, c = 14.068(3)Å. The first coordination complex (GH)2[Cd(pydc)2] · 2H2O, was prepared using LH2 and cadmium(II) iodide, and characterized by 1H and 13C NMR spectroscopy and X‐ray crystallography. The crystal system is triclinic with space group P1¯ with one molecule per unit cell. The unit cell dimensions are: a = 8.5125(7)Å, b = 11.0731(8)Å, c = 13.2404(10)Å. The cadmium(II) atom is six‐coordinated with a distorted octahedral geometry. The two pydc2— units are almost perpendicular to each other. The protonation constants of the building blocks of the pydc‐guanidine adduct, the equilibrium constants for the reaction of pydc2— with guanidine and the stoichiometry and stability of the Cd2+ complex with LH2 in aqueous solution were accomplished by potentiometric pH titration. The solution studies strongly support a self‐association between pydc2— and GH+ with a stoichiometry for the CdII complex similar to that observed for the isolated crystalline complex. In fact, the [Cd(pydc)2]2— complex was found as the most abundant species in solution (> 90 %) at a pH >5. 相似文献
94.
稳态和动态荧光研究疏水缔合共聚物P(AM/POEA)的自缔合行为和聚集体 总被引:1,自引:1,他引:1
应用稳态和动态荧光光谱方法,包括荧光探针、标记荧光和荧光淬灭等研究了共聚物P(AM/POEA)在水溶液中的自缔合性质.这种共聚物由丙烯酰胺(AM)和少量疏水单体2-苯氧乙基丙烯酸酯(POEA)组成.实验结果表明这类共聚物的自缔合行为和聚集体结构主要取决于聚合物的链结构和浓度.由胶束共聚合方法得到具有多嵌段结构的共聚物,它们容易发生疏水缔合,并产生很强的增粘作用,而由普通共聚合方法得到的无规共聚物却没有这些性质.同时这类聚合物的缔合类型及其增粘能力也直接与共聚物中的疏水体含量相关,随疏水体含量增加,由于分子间和分子内缔合的竞争,出现粘度先增后降的现象.在荧光研究的基础上提出了多分子聚合物聚集体的结构模型,它随聚集体浓度增加,进一步形成多联聚集体和网状结构.同时还观察到聚集体中疏水体有序排列现象. 相似文献
95.
M.C Jones 《Journal of multivariate analysis》1998,64(2):148-155
The local dependence function is constant for the bivariate normal distribution. Here we identify all other distributions which also have constant local dependence. The key property is exponential family conditional distributions and a linear conditional mean. When given two marginal distributions only, this characterisation is not very helpful, and numerical solutions are necessary. 相似文献
96.
AM/DMC/C11AM疏水缔合聚两性电解质的合成、表征与溶液性质 总被引:1,自引:0,他引:1
通过Ritter反应合成弱阴离子型疏水单体丙烯酰胺基十一烷基酸(C11AM). 以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)和丙烯酰胺基十一烷基酸(C11AM)为原料, 在水介质中合成新型疏水缔合聚两性电解质AM/DMC/C11AM. 利用1H NMR确证了疏水单体和共聚产物的分子结构. 流变性和芘荧光探针的研究结果表明, AM/DMC/C11AM系列疏水缔合聚两性电解质由于兼具疏水缔合性质和反聚电解质效应, 使其具有较好的耐盐性能. 相似文献
97.
利用有限域上非零向量的道路图结构与内积构作结合方案 总被引:2,自引:0,他引:2
Um(n,R)表示域F上n元非零向量之集.本文先确定了有限域上n≥5维非零向量的道路图结构,然后利用有限域Fq上Um(n,R)/EnR中具有相同范数的向量的道路图结构与内积构作了具有多个结合的结合方案,并计算出相应的参数. 相似文献
98.
A likelihood-based method for haplotype association studies of case-control data with genotyping uncertainty 总被引:1,自引:0,他引:1
ZHU Wensheng & GUO Jianhua School of Mathematics Statistics Northeast Normal University Changchun China 《中国科学A辑(英文版)》2006,49(1):130-144
This paper discusses the associations between traits and haplotypes based on Fl (fluorescent intensity) data sets. We consider a clustering algorithm based on mixtures of t distributions to obtain all possible genotypes of each individual (i.e. "GenoSpec-trum"). We then propose a likelihood-based approach that incorporates the genotyping uncertainty to assessing the associations between traits and haplotypes through a haplotype-based logistic regression model. Simulation studies show that our likelihood-based method can reduce the impact induced by genotyping errors. 相似文献
99.
Kevin Hing-Nin Poon Yu-Ling Cheng 《Journal of inclusion phenomena and macrocyclic chemistry》2008,60(3-4):211-222
Quartz crystal microbalance (QCM) was used to study the self-assembly of per-6-thio-β-cyclodextrin (t7-βCD) on gold surfaces, and the subsequent inclusion interactions of immobilized βCD with adamantane-poly(ethylene glycol)
(5,000 MW, AD-PEG), 1-adamantanecarboxylic acid (AD-C) and 1-adamantylamine (AD-A). From a 50 μM solution of t7-βCD in 60:40 DMSO:H2O, a t7-βCD layer was formed on gold with surface density of 71.7 ± 2.7 pmol/cm2, corresponding to 80 ± 3% of close-packed monolayer coverage. Gold sensors with immobilized t7-βCD were then exposed alternately to six different concentrations of AD-PEG, 500 μM AD-C or 500 μM AD-A aqueous solutions
for association, and water for dissociation. Association of AD-PEG conformed to a Langmuir isotherm, with a best fit equilibrium
constant K = 125,000 ± 18,000 M−1. For AD-C and AD-A, association (k
a
) and dissociation (k
d
) rate constants were extracted from kinetic profiles by fitting to the Langmuir model, and equilibrium constants were calculated.
The parameters for AD-C were found to be: k
a
= 100 ± 5 M−1 s−1, k
d
= 110 (±18) × 10−4 s−1, and K = 9,400 ± 1,700 M−1. For AD-A, k
a
= 58 ± 6 M−1 s−1, k
d
= 154 (±7) × 10−4 s−1, and K = 3,800 ± 400 M−1. The results demonstrate the utility of QCM as a tool for studying small molecule surface adsorption and guest–host interactions
on surfaces. More specifically, the kinetic and thermodynamic data of AD-C, AD-A, and AD-PEG inclusion with immobilized t7-βCD form a basis for further surface association studies of AD-X conjugates to advance surface sensory and coupling applications. 相似文献
100.
Shuangfei Xiang Ting Li Weifu Dong Qinghua Lu 《Journal of polymer science. Part A, Polymer chemistry》2018,56(21):1469-1474
In this article, we report a synergistic strategy to develop dual physically cross-linked tough hydrogels via one-pot bulk copolymerization of N-vinyl-2-pyrrolidone, acrylic acid, and stearyl methylacrylate (SMA) without any adscititious surfactant. Due to synergic effects of hydrogen bonding and hydrophobic association, the resulted dual physically cross-linked hydrogels (DP Gel) with ultra-wide range adjustable Young's modulus (0.08–45.6 MPa), tensile stress (0.7–6.9 MPa), and toughness (3.3–23.1 MJ m−3). Stretching to 300%, DP Gel exhibited fast recoverability that remained ~95% of initial dissipated energy after resting in 60 °C for 3 min. Finally, scanning electron microscopy revealed that the microstructure of hydrogel changed from phase separation structure to micro phase separation as SMA added, which accounted for excellent performance of DP Gel. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56, 1469–1474 相似文献