Materials Literature
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A large-scale Monte Carlo investigation of the interface between the A-rich and B-rich phase of a partially incompatible binary (AB) symmetric polymer mixture is presented. The bond fluctuation model on the simple cubic lattice at a volume fraction ϕ= 0.5 of occupied lattice sites and chain lengths NA=NB=N= 32 is used…
1H NMR assignments of human ubiquitin (76 amino acids, Mr 8565) have been made by a combination of DQF-COSY, DQF-RELAY, NOESY, DQ, and isotropic mixing experiments. Complete NH, C alpha H, and C beta H assignments were obtained; resonances not yet assigned are the side-chain amides of Q-40, Q-41, Q-49, N-60, and Q-62…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Molecular Mechanics Studies on Highly Ruffled Low-Spin (Porphinato)iron(III) ComplexesOrde Q. Munro, Helder M. Marques, Peter G. Debrunner, K. Mohanrao, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1995, 117, 3, 935–954Publication Date (Print):January 1,…
Protein geranylgeranyltransferase-I (PGGT-I) catalyzes the transfer of the 20-carbon prenyl group from geranylgeranyl pyrophosphate to the cysteine residue near the C-termini of a variety of eukaryotic proteins. Kinetic analysis of homogenous PGGT-I from bovine brain reveals that the reaction follows a sequential path…
Owing to its large molecular size, alkylation of 2,4-di-tert-butylphenol with cinnamyl alcohol does not take plAcc using HY zeolite (pore opening 7.4 Å) as catalyst even after controlled steaming treatment to increase its mesoporosity; by contrast, novel mesoporous aluminosilicate MCM-41 catalyses this reaction giving…
X-ray diffraction (XRD), 27Al magic-angle-spinning (MAS) NMR, N2 adsorption measurements and transmission electron microscopy (TEM) show that the one-dimensional channels of the mesoporous aluminosilicate MCM-41 containing only structural (four-coordinate) aluminium are much shorter in the sample with an Si/Al ratio o…
摘要 利用程序升温脱水——色谱检测(TPD-GC),并配合使用热重分析(TGA),差热分析(DTA)和X射线衍射(XRD)研究手段,系统地考察了一组金属离子交换蒙脱石中水的吸附与脱除.实验结果表明,蒙脱石中吸附水的存在状态和数量均明显地依赖于蒙脱石层间可交换金属离子的数目和水合能力.但是,与通常的理解不同,在任何一种离子交换蒙脱石中,这种吸附水都不可能有与蒙脱石间结合力明显不同的两种存在状态. Abstract 作者及机构信息 宫宝安, 齐少梅 1. 烟台师范学院化学系,烟台264025 Authors and contacts GONG BAO-AN, QI SHAO-MEI 1. 烟台师范学院化学系,烟台264025 参考文献…
The pyrochlore solid solution Y3+xTa1–xO7–x in the Y2O3-Ta2O5 system exists from 17.5 to 25 mol% Ta2O5. The conductivity of Y3+xTa1–xO7–x increases with x to a maximum near x=0.2, as a result of the increased content of disordered oxygen vacancies. The activation energy and pre-exponential factor vary in a similar man…
Promoted ignition-combustion is a term which has been used to describe a situation where a substance with poor oxygen compatibility ignites and supports the combustion of a more resistant material. Previous papers on the subject in recent years have reported on the investigation of this phenomenon as it relates to alu…
An attempt is carried out to produce some tangling and opening parts in multi-filament yarn without conventional interlacers; a truck on which the yarn is fastened at its both ends passes through twice under an air jet nozzle to expose two parts of the yarn to an air jet. The effects of the following factors such as t…
An attempt has been carried out to make tangling and opening parts in a yarn without a conventional interlaces, by running a truck which carries the yarn fastened at its both ends and then by exposing the yarn to an air jet in an instant. The action of the air jet on the yarn has been discussed. Moreover, the effect o…
In this study, short bar fracture toughness samples were used to determine the effects of radiation and hydrogen on the resistance to fracture of vitreous silica and four commercial borosilicate glasses. The results showed that neither exposure to 10 10 rads of γ‐radiation nor saturation to a room‐temperature‐equivale…
Abstract The crystal structure of the complexes of some rare‐earths (RE = La, Nd, Pr and Er) with bis‐ and mono‐(2‐ethylhexyl)phosphoric acids were studied by using the X‐ray powder diffraction. The results show that for all RE investigated, the complexes of the diester crystrallize in orthorombic symmetry and cell pa…
New water-soluble porphyrins having fluorine groups [i.e., 5,10,15,20-tetrakis(2-fluorosulfophenyl)porphine, 5,10,15,20-tetrakis(2,6-difluorosulfophenyl)porphine and 5,10,15,20-tetrakis(2,3,5,6,-tetrafluorosulfophenyl)porphine (TF4SP)] have been synthesised and characterized. Moreover, the spectrophotometric determina…
A closed system hot filament chemical vapor deposition (CVD) reactor has been used to deposit diamond films on silicon substrates. A fixed charge of hydrogen gas is fed into the deposition system until the desired deposition pressure level is reached. A solid graphite cylindrical rod held above the tungsten filament w…
Dans ce travail nous présentons une étude spectroélectrochimique "in-situ" par diffusion Raman de la polyaniline en milieu aqueux acidifié ou non. Ce choix de solvant a permis d'obtenir la forme totalement oxydée (pernigraniline) et de caractériser, en absence d'acide, le dopage par simple oxydation de la leucoémérald…
A sol-gel method is employed to coat an insulating layer of magnesium oxide on a Co-based amorphous alloy ribbon and the effects of surface coating are investigated on the core loss and other magnetic properties of the ribbon. The core loss is found to be reduced significantly by the surface coating, the loss reductio…
The catalytic effect of the oxides V2O5, Fe2O3 and PbO on the air oxidation of graphite has been investigated. Graphite surfaces were contaminated with the oxides by soaking in standard solutions of the metal ions. The oxidation reaction was monitored kinetically, by differential thermal oxidation, and chemically, usi…
Abstract Deoxycholic acid is an important physiological bile acid. The binding of bile salts with metal ions has received more attention due to its clinical significance. In this study, a series of copper and zinc deoxycholate complexes were synthesized. EXAFS and FTIR spectroscopic techniques were used for characteri…
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