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Glyoxalase I, a Zn'+-metalloenzyme, induces the slow exchange of the lactoyl Cz proton of the reaction product S-(D-lactoyl)glutathione with the deuterium of 2Hz0, indicating a partial reversal of the enzymatic reaction and confirming a proton transfer mechanism for the isomerization.Paramagnetic effects of the Mn2+su…
Abstract Scanning electron microscopy studies have been carried out on gum and filled natural rubber vulcanizates to investigate the ridge formation in the abrasion of elastomers. The first step of the ridge formation is the occurrence of small particles on the smooth abrading surface by a process of microtearing. The…
It is shown by explicit calculation that there are 12 bulk elastic constants and 3 surface terms in the elastic energy of biaxial nematics.Received 29 December 1981DOI:https://doi.org/10.1103/PhysRevA.26.1783©1982 American Physical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSmall-angle neutron scattering from elastomeric networks. Application to labeled chains containing several crosslinksRobert UllmanCite this: Macromolecules 1982, 15, 5, 1395–1402Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published…
Abstract The kinetics of the thermal regeneration of activated carbons used in the waste water treatment was analyzed on the basis of a model that the regeneration reaction consists of a set of many first‐order reactions each of which has different activation energy and frequency factor. The frequency factors were cor…
Experimental data on the longitudinal magnetostriction of two pure and one $p$-type bismuth single crystals are reported for fields up to 19 T at temperatures near 2 K. These data are consistent with a model based on the deformation potential concept used to compute the magnetostrictive strain components versus field,…
In the past, two factors have impeded the quantitative estimate of Fe-oxides in soils by X-ray diffraction. First, Fe-oxides are still quite often considered X-ray amorphous, although numerous results, e.g. a low ratio of oxalate- to dithionite-soluble Fe, have indicated the opposite. Second, even if crystalline, the…
We report the results of calculations of the average polarizability α and second hyperpolarizability γ for benzene, naphthalene, and three different configurations of biphenyl, phenanthrene, anthracene, and pyrene. The computations were performed employing a scheme whose main elements are McWeeny’s coupled Hartree–Foc…
Poly(hydroxyethyl methacrylate) (PHEMA) was implanted subcutaneously in rats, hamsters, and guinea pigs for up to 24, 23, and 13 months, respectively. The tissue response and tumorigenesis caused by PHEMA were compared among the three species of the animals. Thick fibrous capsule formation and tumor production were no…
The metabolism of di-n-butylphthalate by a denitrifying strain of Pseudomonas pseudoalcaligenes B20b1 was studied under anaerobic conditions, with nitrate as the only electron acceptor. Thin-layer chromatography and mass spectral analysis of culture extracts (20 days at 30 degrees C) showed mono-n-butylphthalate and p…
In a tokamak reactor that operates in a cyclic mode, thermal stresses will result in fatigue in structural components, especially in the first wall and blanket. There has been limited work on fatigue in irradiated alloys, but none on irradiated materials containing irradiation-induced helium, which will be characteris…
The defect structure of acceptor‐doped (Fe, Al, Cr) polycrystalline strontium titanate was investigated by measuring the equilibrium electrical conductivity as a function of oxygen activity (10 −21 ≤a o2 ≤1) and temperature (85°C≤ T ≤ 1050°C). The electrical conductivity was n type with ∼−1/4 dependence on a 02 for a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra of molecular oxygen adducts of (tetraphenylporphyrinato)manganese(II) in argon matrixesMarek W. Urban, Kazuo Nakamoto, and Fred BasoloCite this: Inorg. Chem. 1982, 21, 9, 3406–3408Publication Date (Print):September 1, 1982Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModels for cobalt(II)-substituted zinc metalloenzymes. 1. Comparison of the crystal structures of complexes of the type: [M(RCOO)2(Im)2] (Im = imidazole; M = Co, Zn; R = CH3, C2H5)William D. Horrocks Jr., Joseph N. Ishley, and Robert R. WhittleCite this: Inorg. Chem. 1982, 2…
Coupled SCF perturbation theory has been used to calculate the polarizability α and second hyperpolarizability γ of a number of polyenes. An extended basis CNDO wave function has been employed. Our computational approach is based on optimizing the exponents of a small basis set with respect to the experimental values…
The self-diffusion of oxygen in NiO has been measured under 150 Torr of oxygen between 1100 and 1600°C. Diffusion profiles were determined with secondary-ion mass spectrometry. The values of the self-diffusion coefficients between 1200 and 1600°C are given by D (cm2 s−1)= 50 exp (-5·6 eV/kT).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical characterization of phthalocyanine, tetraazaporphyrin, tetrabenzoporphyrin, and porphyrin electronic spectraLi Kao Lee, Nora H. Sabelli, and P. R. LeBretonCite this: J. Phys. Chem. 1982, 86, 20, 3926–3931Publication Date (Print):September 1, 1982Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneration of continuous beams of refractory metal clustersS. J. Riley, E. K. Parks, C. R. Mao, L. G. Pobo, and S. WexlerCite this: J. Phys. Chem. 1982, 86, 20, 3911–3913Publication Date (Print):September 1, 1982Publication History Published online1 May 2002Published inissue…
Results of strength and fracture–toughness tests on single crystals of partially stabilized ZrO 2 at temperatures above and below the tetragonal–monoclinic transformation temperature are reported. The temperature dependence of toughening mechanisms is discussed with respect to theories for phase–transformation toughen…
The adsorption of laterally and polarly flagellated bacteria to chitin was measured, and from the data obtained, a modified Langmuir adsorption isotherm was derived. Results indicated that the adsorption of laterally flagellated Vibrio parahaemolyticus follows the Langmuir adsorption isotherm, a type of adsorption ref…