Materials Literature
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Hydrolysis of the gentisate ring-cleavage product, maleylpyruvate (cis-2,4-diketohept-5-enedioic acid), was shown to be catalyzed by an enzyme, maleylpyruvate hydrolase 11, in Pseudomonas alcaligenes (P25X1) after growth with 3-hydroxybenzoate. This activity was separated from fumarylpyruvate hydrolase activity during…
Stoichiometric cobalt ferrite was synthesised in the laboratory using a standard ceramic method and the crystal structure was identified by X-ray diffraction using FeK alpha radiation. The oxidation states of the cations were determined by studying the chemical shifts. The degree of inversion in this ferrite was estim…
Glaiis transitions of As-Se glasses have been investigated over a wide range of compositions by using differential \nscanning calorimetry. The variation of Tg with composition has been interpreted on the basis of a bond-lattice \nmodel.
The X-band (9 GHz) ESR spectra of the copper(I1)-doped pseudotetrahedral complex dichlorobis(tripheny1phosphine oxide)zinc(II) have been recorded on single crystal at 4.2 K. They are interpreted by using the spin Hamiltonian parameters g, = 2.46, gr = 2.08, g3 = 2.08, AI = 40 X lo4 cm-I, A2 = 25 X lo4 cm-I, AB = 20 X…
Abstract The rate of removal of mineral oil soils from model polyester sub‐strates by the roll‐up mechanism shows a marked dependence on nonionic surfactant concentration even above the critical micelle concentration (cmc). Similarly, although the solid/water interfacial tension is observed to be constant, the equilib…
Swelling and gas release in a model ceramic system, ZnO, were studied under known internal and external pressures, oxygen partial pressures, and temperatures. When gas was not released, the instantaneous swelling strain rate was: εα( DF exp‐Q/RT) where DF is the instantaneous pressure driving force for swelling, Q = 1…
ABSTRACT Thermal degradation of N 5 methyltetrahydrofolic acid (N 5 MTHFA) under various conditions was studied, using a radioassay method to measure N 5 MTHFA concentrations. In the presence of an unlimited oxygen supply, the degradation reaction could be described as pseudo first order. Reaction rate constants were…
Abstract The kinetics and equilibria of SO 2 sorption in Kapton polyimide film have been measured at 25°C for pressures up to 58 cm Hg using a quartz spring balance. The observed equilibria are described well by the dual‐mode model for sorption of penetrants in glassy polymers. Observed hysteresis in sorption‐desorpti…
Abstract Linear polyurethane elastomers were synthesized in dimethyl acetamide (DMAc) solution, starting from 4,4′‐methylene diisocyanate 1,4‐butanediol, and polyester diols of two different molecular weights (MW) and each with a series of molecular weight distributions (MWD). Diol samples of various MWD's were prepar…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray Diffraction Analysis of the Structure of Poly(dichlorophosphazene)H Allcock, R Arcus, and E StrohCite this: Macromolecules 1980, 13, 4, 919–928Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://pubs.a…
The combined effect of an electric field and reduced dimensionality on the hopping motion of a charge carrier in an anisotropic molecular crystal is determined. New, exact expressions for S(t), the number of distinct sites occupied by a carrier in time t, are presented for two-dimensional and three-dimensional anisotr…
A series of new high-energy Fe-Cr-Co magnet alloys with (BH)max≃8–10 MG Oe have been developed. An Fe-22Cr-15Co alloy with equiaxed grain structure achieves (BH)max=8.3 MG Oe utilizing the abnormal shape of the miscibility gap of the system. The addition of Mo to the alloys enhances the anisotropic decomposition and t…
The systems and each contain six intermediate compounds of 4:1, 3:1, 1:1, 1:2, 1:3, and 1:5 ratios. The systems were investigated by solid‐state reactions and also by quenching methods in the glass‐forming region between the 1:2 and 1:5 compounds. The 4:1, 1:2, 1:3, and 1:5 compounds in the two systems appear to have…
Abstract A series of 2‐substituted 4 H ‐3,1‐benzoxazinones and 2,3‐disubstituted 4‐(3 H )quinazolinones have been synthesized in mild conditions by the use of triphenyl phosphite and pyridine as cyclising medium. Benzox‐azinones are produced either by ring closure of 2‐(acylamino)benzoic acids or in the reaction of be…
In this paper the Rayleigh hypothesis in the theory of reflection by a cylindrical perturbation in a plane surface is investigated analytically. The hypothesis asserts that above the surface the scattered field may be expanded in terms of outward‐going wave functions. As such, it is analogous to the assumption made by…
The increase of the shielding factor due to shaking was measured in a scale model for a magnetically shielded room. The increase was found to be 7 dB for a single-layer square cylinder biased by the Earth's magnetic field. The shielding factor of a large-volume three-layer Mumetal®room was estimated to increase by a f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures and properties of N-methyltetraphenylporphyrin complexes. Crystal and molecular structure and cyclic voltammetry of an air-stable iron(II) porphyrin: chloro(N-methyl-5,10,15,20-tetraphenylporphinato)iron(II)Oren P. Anderson, Alan B. Kopelove, and David K. Lavallee…
We have studied a two-dimensional ensemble of cylindrically symmetric particles interacting via a weak anisotropic potential using the Monte Carlo technique of computer simulation. The calculation is simplified by confining the particles to the sites of a triangular lattice. The internal energy, specific heat, second…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic approaches to planar carbon. 1Wolter Ten Hoeve and Hans WynbergCite this: J. Org. Chem. 1980, 45, 15, 2925–2930Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://pubs.acs.org/doi/10.1021/jo01303a0…
The passivation of copper anodes due to precipitation of copper sulfate on the anode surface was investigated as a function of electrolyte composition and temperature, and of anode composition. The slime layer present on the anode surface was shown to be the primary factor in causing passivation by inhibiting the diff…