Materials Literature
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The structure of asymmetric [110] tilt boundaries developed during creep of pure aluminium single crystals is studied using high-resolution electron microscopy. The small- and moderate-misorientation boundaries are composed of Lomer and 60° dislocations. Extensive image simulation is used to deduce the detailed core s…
We examine the pattern of infall velocities induced by a rich cluster of galaxies. An infall model based on the Friedmann solution yields the exact implicit dependence of the peculiar velocity on the density enhancement {DELTA} and the mean cosmological mass density {OMEGA}_0_. The exact solution and an explicit expan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkene epoxidations catalyzed by iron(III), manganese(III), and chromium(III) porphyrins. Effects of metal and porphyrin substituents on selectivity and regiochemistry of epoxidationTeddy G. Traylor and Andrew R. MiksztalCite this: J. Am. Chem. Soc. 1989, 111, 19, 7443–7448P…
1. The effects of gamma-aminobutyric acid (GABA) on membrane potential and conductance as well as on the intracellular Cl- activity (aiCl) and intracellular pH (pHi) were studied in crayfish muscle fibres using a three-microelectrode voltage clamp and ion-selective microelectrodes. In the presence of CO2-HCO3-, the in…
Abstract The Powder Diffraction File (PDF) X-ray diffraction pattern for SnO 2 (cassiterite, syn), determined in the early 1950's at the National Bureau of Standards, was evaluated using the NBS*AIDS83 editorial review program and a calculated powder pattern. Systematic errors in d-spacings and relative intensities we…
Poly-beta-hydroxybutyrate/calcium polyphosphate (PHB-CaPolyPi) complexes exist as labile quasi-crystalline structures in bacterial plasma membranes. The composition, structure, and distribution of the complex suggest it may play a role in the regulation of intracellular calcium and in calcium signaling. The importance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and chemical properties of the Dow perfluorosulfonate ionomersRobert B. Moore III and Charles R. MartinCite this: Macromolecules 1989, 22, 9, 3594–3599Publication Date (Print):September 1, 1989Publication History Published online1 May 2002Published inissue 1 Septe…
Coordination and local geometry around Si cations in silicate liquids are of primary importance in controlling the chemical and physical properties of magmas. Pressure-induced changes from fourfold to sixfold coordination of Si in silicate glass samples quenched from liquids has been detected with (29)Si magic-angle s…
The inhomogeneous Ornstein–Zernike equation and the Triezenberg–Zwanzwig expression for the density profile are solved using the Percus–Yevick closure for the inhomogeneous pair correlations of a hard-sphere fluid in the vicinity of an isolated hard-sphere particle. Results are presented for the solvent density profil…
A greenhouse experiment was conducted to evaluate “liming”; potential of different green manures. Ground leafy materials of cowpea (Vigna unguiculata), leucaena (Leucaena leucocephala) and guinea grass (Panicum maximum) were added at 0, 5, 10 and 20 g/kg to an Ultisol having a soil‐water pH 4.0, KCl‐extractable Al = 7…
Fully densified silicon nitride without additives was fabricated by means of hot isostatic pressing. The sintering process of highly pure powder was investigated with special interest in the evolution of α–β phase transformation, densification, and microstructure development. It was observed that the transformation oc…
Six individual amino acid substitutions at separate positions in the tertiary structure of subtilisin BPN' (EC 3.4.21.14) were found to increase the stability of this enzyme, as judged by differential scanning calorimetry and decreased rates of thermal inactivation. These stabilizing changes, N218S, G169A, Y217K, M50F…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain dynamics, mesh size, and diffusive transport in networks of polymerized actin: a quasielastic light scattering and microfluorescence studyChristoph F. Schmidt, Michael Baermann, Gerhard Isenberg, and Erich SackmannCite this: Macromolecules 1989, 22, 9, 3638–3649Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetically stable complexes of alkali cations with rigidified calix[4]arenes: synthesis, x-ray structures, and complexation of calixcrowns and calixspherandsPieter J. Dijkstra, Jos A. J. Brunink, Kjell Erik Bugge, David N. Reinhoudt, Sybolt Harkema, Rocco Ungaro, Franco Ugo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen adsorption on well-outgassed and partially reduced cerium oxide studied by FT-IRCan Li, Kazunari Domen, Kenichi Maruya, and Takaharu OnishiCite this: J. Am. Chem. Soc. 1989, 111, 20, 7683–7687Publication Date (Print):September 1, 1989Publication History Published on…
A nearly symmetric critical mixture (φc=0.486) of perdeuterated and protonated 1,4-polybutadiene exhibiting an upper critical solution temperature Tc=61.5±1.5 °C has been quenched from the homogeneous state (≂75 °C) to various temperatures between 25 and 57.5 °C. Light scattering measurements document the subsequent s…
Synthetic diamonds grown by the temperature-gradient method at temperatures just above the melting point of the solvent-catalyst often have an unattractive dull-green colour. This green colour, which is prominent at room-temperature, disappears if the diamond is cooled to below 120 K and is restored on warming the cry…
The reader should first refer to the summary of the IA(1), IB(2) and IIA(3) parts of this work (published in Materiales de Construcción nos. 209, 211 and 212, respectively) in order to have a clearer idea of the subject being dealt with herein. The use of the larger quantities of gypsum as aggressive agent than the 15…
Polarization Resistance (Rp) has been the electrochemical technique employed to study quantitatively the influence of Cl- and OH- ions on the corrosion of steel reinforcing, in a synthetic aqueous medium of similar composition to those of the concrete pore solution. Ionic strength, resistivity and their variations in…