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Abstract It is shown by ESR‐measurements on differently treated single crystals of MoO 3 that in these crystals the localisation of molybdenum 4d 1 electrons is always connected with the presence of protons. We determine the parameters of the transferred hyperfine interaction tensor.
Abstract Polyethylenimine (PEI) has been oxidized with aqueous hydrogen peroxide to yield a hygroscopic, water‐soluble, slightly basic, yellow polymeric solid (OPEI) containing about 25% oxygen. Some chain degradation accompanies oxidation. The nature of the product varies somewhat with preparative conditions. OPEI, i…
The temperature dependence of the direction of the easy axis of magnetization in the ferromagnetic compound Cr 1- x Te ( x =0.077, T c =342 K) is determined by single crystal magnetic and neutron diffraction measurements in the temperature range from 80 K to 350 K. Below about 200 K the spin direction lies in the c -p…
In this article, we derive the balance laws and constitutive equations of polarized elastic solids with electronic spin by use of a relativistic (special) variational principle. The theory is fully dynamical and nonlinear. It is shown that this approach encompasses several previous works in micromagnetism (magnetoelas…
The ionic strength, concentration, and temperature effects on the association‐dissociation properties of lysozyme in aqueous solution have been studied by gel chromatography. The following results were obtained: Increasing ionic strength leads to an increase in inter‐conversion rate between the monomeric and associate…
Nearly stoichiometric MgAl2O4 spinel single crystals can be grown by a gradient furnace technique in molybdenum crucibles with an inert-gas atmosphere of industrial-grade argon, high-purity argon, or technical-grade helium. There is a reaction between MgO in the melt and the molybdenum crucibles which results in bands…
In this article, we give an axiomatic introduction of directors in the space-time continuum of Minkowski. A variational principle is presented that leads to the complete set of field equations, boundary conditions, and jump relations of the Kafadar-Eringen theory of relativistic polar media. The constitutive equations…
Abstract Several polyvinylesters of substituted cinnamylideneacetic acids were synthesized and their photosensitivities were investigated. It was found that polyvinylesters of planar acids reacted photochemically effectively and were spectrally sensitized by usual triplet sensitizer. On the other hand, polyvinylesters…
The crystal structure of the synthetic zeolite (K,Ba)- G , L , of unit cell composition K 2.7 Ba 7.65 [A1 18 Si 18 O 72 ] · 23H 2 O, has been determined at room temperature from accurate powder data. The zeolite is hexagonal with a = 18.70° and c = 7.50°. The structure was refined to an R ( I ) value of 0.13 assuming…
Collision integrals (transport cross section) for atomic oxygen in the ground state ( 3 P) and in the first two excited states ( 1 D, 1 S) have been calculated, using potential energy curves as determined by ab initio quantum mechanical computations. The calculations include the collision integrals for diffusion, visc…
Stoichiometric sample of Fe 2 MoO 4 was prepared in a controlled atmosphere of CO 2 -H 2 mixed gas at 1140°C (log P o 2 - P o 2 ∼-12.5). The crystal structure and the cation distribution were determined from, X-ray and neutron diffraction measurements on the powdered samples. Fe 2 MoO 4 is a completely inverse spinel;…
Abstract Heats of fusion and melting temperatures were obtained for selected monomeric n ‐alkyl acrylates, N‐n ‐alkylacrylamides, and vinyl esters. The corresponding thermodynamic parameters for homopolymers, derived from these monomers, had been reported previously from this laboratory. The α‐hexagonal crystal modifi…
Requirements for tissue-equivalent mixtures are discussed, and methods are described for formulating mixtures exact in elemental composition and density. Methods are also given for estimating the densities and vapour pressures of mixtures of known compounds, as well as a list of the properties of compounds useful in t…
Saturation magnetization, intrinsic coercive force, anisotropy field, and anisotropy constants were determined for a sample of sintered Co5Sm at 4.2, 77, 300, and 500 °K. The ralationship between the temperature dependence of the coercivity and the anisotropy parameters is discussed.
1. The properties and kinetics of the 2,3-diphosphoglycerate-dependent phosphoglycerate mutases are discussed. There are at least three possible mechanisms for the reaction: (i) a phosphoenzyme (Ping Pong) mechanism; (ii) an intermolecular transfer of phosphate from 2,3-diphosphoglycerate to the substrates (sequential…
Values of the Grüneisen parameter γ reported in the literature for polyethylene (PE) vary over nearly four orders of magnitude. Part of the reason for this wide variation is the variety of definitions and experimental techniques used in obtaining γ. A simple unified derivation of these equations will be presented in a…
Self-diffusion coefficient of oxygen in polycrystalline MgO can be represented by D=4.5×10−5exp(−60200/RT)cm2/sec for 80–115 mesh particles and by D=1.3×10−5exp(−60200/RT)cm2/sec for 170–200 mesh particles. These two activation energies are exactly the same, but the magnitude of the diffusion coefficients varied from…
Photoelectron energy degradation calculations have been performed with the improved analytic expression for the photoelectron to ambient electron energy transfer rate given by Swartz et al. (1971). On the basis of these calculations, two curves for the mean energy transferred per photoelectron to the ambient electrons…
Abstract α-Ketoglutarate synthase from the photosynthetic bacterium Chlorobium thiosulfatophilum, an enzyme that catalyzes the formation of α-ketoglutarate by a reductive carboxylation of succinyl-CoA, was purified about 120-fold by high speed centrifugation, fractionation with protamine sulfate, column chromatography…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of metalloporphyrin complexes. Ligand photoisomerization via intramolecular energy transferDavid G. Whitten, Peter D. Wildes, and Carol A. DeRosierCite this: J. Am. Chem. Soc. 1972, 94, 22, 7811–7823Publication Date (Print):November 1, 1972Publication History…