Materials Literature
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La phase haute temperature (T>83,5 K) du benzile cristallise dans le systeme rhomboedrique avec le groupe d'espace P3 1 21. Affinement de la structure jusqu'a 0,043 (T=294 K) et 0,041 (T=100 K). La phase basse temperature cristallise dans le systeme monoclinique avec le groupe d'espace P2 1 . Affinement jusqu'a 0,066…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reactivity of manganese(II) porphyrins. Effects of dioxygen, benzoic anhydride, and axial ligandsS. E. Creager and Royce W. MurrayCite this: Inorg. Chem. 1987, 26, 16, 2612–2618Publication Date (Print):August 1, 1987Publication History Published online1 May 2…
An investigation of the electrochemical noise generation during the stress corrosion cracking (SCC) of alpha-brass was conducted in Mattsson1 solution (ammoniacal copper sulfate solution) of pH 7.2 under free corrosion potential. The electrochemical noise was observed as spontaneous potential fluctuations. The analysi…
Abstract Phase transition of water sorbed in regenerated cellulose (II), for water contents ranging from 0 to 1,0 (water/dry cellulose, g/g), was investigated by differential scanning calorimetry (DSC). It was found that the amount of water bound to each glucose unit is ca. 3 mol considering that water diffuses only i…
The thermal expansion and magnetic susceptibility have been measured for Y(Mn 1-x Al x ) 2 pseudobinary Laves phase intermetallic compounds. A large volume change at T N and a remarkable enhancement of the thermal expansion coefficient above T N were observed in YMn 2 . The substitution of Al for Mn makes these anomal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt mixed spinels as catalysts for the synthesis of hydrocarbonsGiuseppe Fornasari, Stefano Gusi, Ferruccio Trifiro, and Angelo VaccariCite this: Ind. Eng. Chem. Res. 1987, 26, 8, 1500–1505Publication Date (Print):August 1, 1987Publication History Published online1 May 20…
The liquid structure of dimethyl sulfoxide (DMSO) was investigated by X-ray diffraction. The intramolecular structure parameters were obtained as follows: S = 0 150(1) pm, C - S 180(1) pm, nonbonding C · · · O 267(4) pm and C · · · C 271 (7) pm. It is suggested that the molecular arrangement in the liquid state is sim…
A numerical model is developed for calculating the transformation of irregular waves due to refraction, diffraction and breaking. The model is based on a parabolic equation which is derived from the mild slope equation1) with an additional term of energy dissipation.In the present model, irregular waves are treated as…
The dissolution kinetics of crystalline and amorphous silica were studied as a function of time, temperature, concentration of HF, concentration of HC1, and crystallographic orientation. The results indicate that dissolution is a surface reaction‐controlled process. The dissolution rate depends strongly on HF concentr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyanions as nucleophiles. 1. Synthesis, characterization, and reactions of Keggin- and Dawson-type tungstostannates(II)Gayatri S. Chorghade and Michael T. PopeCite this: J. Am. Chem. Soc. 1987, 109, 17, 5134–5138Publication Date (Print):August 1, 1987Publication Hist…
Dedifferentiated chick embryo chondrocytes (Castagnola, P., G. Moro, F. Descalzi-Cancedda, and R. Cancedda, 1986, J. Cell Biol., 102:2310-2317), when transferred to suspension culture on agarose-coated dishes in the presence of ascorbic acid, aggregate and remain clustered. With time in culture, clusters grow in size…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of the Pariser-Parr-Pople approximation to obtain practically useful predictions for electronic spectral properties of conducting polymersPaul M. Lahti, Jan Obrzut, and Frank E. KaraszCite this: Macromolecules 1987, 20, 8, 2023–2026Publication Date (Print):August 1, 1987…
The luminescence properties of Ce 3+ ‐ and Tb 3+ ‐activated and of Tb 3+ ‐activated are reported. It is shown that activated with Tb 3+ is an excellent phosphor both under UV and x‐ray excitation. In both types of compounds there are two different Ln 3+ sites available for the activator ions, Ce 3+ and Tb 3+ . The res…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly reactive magnesium and its application to organic synthesesTimothy P. Burns and Reuben D. RiekeCite this: J. Org. Chem. 1987, 52, 16, 3674–3680Publication Date (Print):August 1, 1987Publication History Published online1 May 2002Published inissue 1 August 1987https://p…
The degradation of tin-doped indium-oxide (ITO) films in glow-discharge plasmas of hydrogen and argon have been investigated. Parameters which have been varied for the study include the temperature of ITO under ion bombardment, the rf power density, the time of exposure to plasma, and the gas flow rate. After bombardm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition of linear polymer dimensions from .THETA. to collapsed regime. 1. Polystyrene/cyclohexane systemI. H. Park, Q. W. Wang, and Benjamin ChuCite this: Macromolecules 1987, 20, 8, 1965–1975Publication Date (Print):August 1, 1987Publication History Published online1 May…
Solutions of tetramethoxysilicon were reacted, using both acid and base as catalysts, until near the sol-gel transition. Portions of the reacting mixture were quenched by dilution, and the average cluster mass and correlation length were measured with use of static and dynamic light scattering. Critical exponents desc…
Arginine 179 of the alpha subunit of tryptophan synthase of Salmonella typhimurium was changed to leucine by site-directed mutagenesis. The mutant alpha subunit was expressed in S. typhimurium, purified and crystallized as the alpha 2 beta 2 complex, and characterized by kinetic studies under steady-state reaction con…
Abstract Crystal structure of uncomplexed γ-cyclodextrin, C48H80O40·14.1H2O, was determined by the X-ray method. The crystal is monoclinic and the space group is P21 with cell dimensions; a=16.847(2), b=11.098(2), c=20.271(2) Å, and β=104.97(1)°. The structure was solved by the inspection of a Patterson map and the R-…
The dielectric properties of liquid water are studied using an empirical potential model treating the monomers as flexible molecules with short-range interactions between oxygens and Coulomb interactions between charges situated on the individual atoms. Satisfactory results for the static dielectric constants at 259,…