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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…
Poly-thiophene perchlorate is prepared electrochemically in an electrolyte of 0.5 M AgClO 4 and 0.2 M thiophene in acetonitrile. Dark greenish film with the complex of ca . [C 4 H 2 S(ClO 4 ) 0.26 ] x is obtained. The electrical conductivity along the film surface is about 0.6 Ω -1 cm -1 .
A Monte Carlo study of self-avoiding walks on the diamond lattice is presented. This model incorporates some of the steric effects and short-range stiffness of real alkanes, and for a nearest-neighbour attractive interaction- epsilon is found to have a collapse transition at k B theta / epsilon =2.25+or-0.05. The beha…
The effects of starvation, glucose refeeding, dibutyryl cAMP, and dexamethasone on expression of the gene for phosphoenolpyruvate carboxykinase (GTP) [GTP:oxaloacetate carboxy-lyase (transphosphorylating), EC 4.1.1.32] from rat liver cytosol was studied by using a cloned cDNA probe. The rate of transcription of the ge…
A series of ceramic compositions based on variations in the crystal–glass ratio of a mullite body were developed. The thermal expansion of these compositions varies from 3.7 to 5.0×10 –6 /°C to 800°C. The materials are particularly useful for applications involving silicon, in that an identical thermal expansion is av…
Abstract Three types of additives for polymers have been studied in polystyrene and poly(methyl methacylate). The effects of a novel thermal stabilizer 3,5‐ditertiarybutyl 4‐hydroxybenzyl thioglycollate (DBHBT), zinc diethyldithiocarbamate (ZnDEC) have been compared with the commercial antioxidant Irganox 1076. It has…
The present research, which has included experiments on both fracture-mechanics specimens and actual pipe sections, has shown that hydrogen gas can dramatically increase fatigue-crack-growth rates in steels that are typical of those used in pipelines. The specific materials used in the present work were ASTM A516, AST…