Materials Literature
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Gentisate:oxygen 1,2-oxidoreductase (decyclizing) (EC 1.13.11.4; gentisate 1,2-dioxygenase) from Moraxella osloensis was purified to homogeneity as shown by polyacrylamide gel electrophoresis. The enzyme has a molecular weight of about 154,000 and gives rise to subunits of molecular weight 40,000 in the presence of so…
Surface flaws of controlled size and shape were produced in high‐strength hot‐pressed Si 3 N 4 with a Knoop microhardness indenter. Fracture was initiated at a single suitably oriented flaw on the tensile surface of a 4‐point‐bend specimen, with attendant reduction in the measured magnitude and scatter of the fracture…
The N-acetymuramic acid L-alanine amidase from Bacillus subtilis (ATCC 6051) has been purified to homogeneity. It is a monomeric protein of molecular weight 50,000. The enzyme has a high affinity for homologous cell walls and once attached to a cell wall will hydrolyze the wall completely before initiating the hydroly…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCNDO model of carbon monoxide chemisorbed on nickelG. BlyholderCite this: J. Phys. Chem. 1975, 79, 7, 756–761Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue 1 March 1975https://pubs.acs.org/doi/10.1021/j100574a018https://…
The relative stability of a long period superlattice over the ordinary superlattice (or a long period superlattice with infinite period) decreases as the period M becomes larger and vice versa. The pressure dependence of the phase relations of superstructures of a Cu–51 a/o Au alloy observed by H. Iwasaki and co-worke…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and anodic peak potentials of salts of coordination compounds derived from boric acid and polyhydric phenolsManuel Finkelstein, Edward A. Mayeda, and Sidney D. RossCite this: J. Org. Chem. 1975, 40, 6, 804–805Publication Date (Print):March 1, 1975Publication Hist…
H atoms, which have been generated in the gas phase, have been allowed to interact with palladium metal and several of its substitutional f.c.c. alloys. It has been found that quite high concentrations of interstitial hydrogen can be introduced in this manner even in the absence of poisons such as H 2 S. The kinetics…
The infrared spectra of the vapors over alkali metal perchlorate salts at temperatures in the 400−450° range have been measured by isolation of molecular beams of the vapor species in various matrices at 12°K. The data indicate that at these temperatures the dominant vapor species are the monomeric ion pairs, M+ClO−4,…
Abstract Les composés K 3 VO 4 , K 3 CrO 4 et K 3 MnO 4 existent sous deux formes allotropiques isotypes respectivement de K 3 Cr(O 2 ) 4 et de Na 2 CaSiO 4 . Des mesures magnétiques confirment le degré d'oxydation +V du chrome et du manganèse.
The moth’s eye principle of optical-impedance matching by means of an array of tapered protuberances has been studied to determine the limit obtainable for reflection reduction. Analogous multilayer equivalents were optimized over a wide band, using a recently developed optimization method, in which one or more of the…
The kinetics of the K + ⇌ Na + exchange in Na 2 O·3SiO 2 glass at 350°C were studied. The distribution of K in the glass specimens after exchange in molten KNO 3 was determined with an electron microprobe. The calculated interdiffusion coefficients, which varied with the local composition in the glass, were compared w…
Digital clipped auto correlation spectroscopy was used to investigate the kinetic features of thermodynamic fluctuation processes which relax on time scales from 10 −6 to 10 2 s. The autocorrelation function associated with structural relaxation in Na 2 O· K 2/ O·6SiO 2 , glass was determined in the annealing region.…
The present status and prospects of the laser flash method for the measurement of thermal properties of nuclear materials are reviewed. Special emphasis is placed on the progress seen in experimental techniques for obtaining precise data on heat capacity and thermal diffusivity from 80 to 1,000 K. In this temperature…
Simple geometrical considerations predict 3 types of tilt grain boundaries in smectics A : curvature of the layers, arrays of dislocations and focal domains of equal eccentricity. These 3 possibilities are shown to exist in CBOOA (shear experiment). Their energies are discussed in terms of a simple model.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and bonding of tetrameric triphenylphosphine silver halide cluster systems. Evidence of dictation of stereochemistries by van der Waals interactionsBoon-Keng Teo and Joseph C. CalabreseCite this: J. Am. Chem. Soc. 1975, 97, 5, 1256–1257Publicatio…
Abstract The purpose of this study was to investigate contact nucleation for various types of crystalline materials. Selected were aqueous solutions of two hydrated inorganic salts (MgSO 4 · 7H 2 O and KAl(SO 4 ) 2 · 12H 2 O), one nonhydrated inorganic salt (K 2 SO 4 ) and one organic substance (citric acid). Nucleati…
Gamma-ray buildup factors in ordinary concrete have been calculated by the moments method. Results for concrete kerma and air kerma are tabulated for source energies from 15 MeV to 15 keV. Parameters are given that allow calculation of the buildup factor by means of a simple analytic expression. Comparisons are made w…
If two metal plates are brought together at a sufficiently high relative velocity, a jet may form which removes much of the surface impurities, and a strong bond occurs. The purpose of this paper is to decribe the formation of a wave interface, and to suggest why a bond often occurs without the appearance of such wave…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the thermal decomposition of methyldisilane and trisilaneA. J. Vanderwielen, M. A. Ring, and H. E. O'NealCite this: J. Am. Chem. Soc. 1975, 97, 5, 993–998Publication Date (Print):March 1, 1975Publication History Published online1 May 2002Published inissue 1 March…
High-resolution single-crystal electron diffraction intensity data from fully hydrated, flat, rectangular catalase microcrystals are subjected to various tests which support the thesis that diffraction from crystals with thicknesses up to at least 1500 Å may be treated by the kinematical theory. The ratio of the total…