Materials Literature
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Abstract The Upper Pliocene sediments near Lebrija in southern Spain contain commercial deposits of palygorskite and sepiolite. These sediments of continental origin consist chiefly of carbonate, marl, and clay resting on marine Pliocene quartzose sand. The lowest unit, the “Marly-Calcareous Bed,” consists of sepiolit…
Cyclopropanone hydrate irreversibly inactivates horseradish peroxidase in a time-dependent manner in the presence of oxidizing agent, hydrogen peroxide. The inhibition reaction is a second order reaction of cyclopropanone hydrate with compound I, the 2 electron-oxidized form of peroxidase, and results in covalent modi…
Magnetic susceptibilities and magnetization isotherms have been measured for single crystal FeTiO 3 . The susceptibility parallcl to the c -axis has a large and sharp peak at T N =58.0±0.3 K, while the perpendicular susceptibility is almost independent of temperature below T N . Magnetization isotherm at 4.2 K with fi…
Corrosion and fission product release from silicon carbide (SiC)-coated high-temperature gas-cooled reactor fuel particles represent a serious problem. The SiC corrosion by fission product palladium has been observed. The current results show that temperature is the major factor affecting the corrosion rate of SiC by…
A new criterion of phase separation of segmented polyurethaneureas. is found by comparing the relative crystallinity of the soft segment of polyurethaneurea. This criterion is more sensitive than the conventional thermal transition temperature measurements. The difference of crystallinity can be distinguished even if…
The nature of the deformation process involved in hot drawing of porous high-molecular-weight polyethylene was examined by apparent elongational viscosity measurements at drawing temperatures between 100°C and 150°C and deformation rates in the range of 10−6–10−3 m/s. The temperature dependence of the apparent elongat…
Growth of various species of macro-algae and diatoms was measured in culture in a range of concentrations of germanium dioxide. Growth of Laminaria saccharina was inhibited measurably at concentrations above 0.22 mg GeO2 l−1 and very markedly inhibited above 1.1 mg GeO2 l−1. Fucus spiralis was measurably inhibited at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer effect and magnetic investigation of the S = 3/2 .tautm. S = 1/2 spin crossover in [Fe(salen)NO] and the S = 3/2 state in [Fe(5-salen)NO]F. V. Wells, S. W. McCann, H. H. Wickman, S. L. Kessel, D. N. Hendrickson, and R. D. FelthamCite this: Inorg. Chem. 1982, 21, 6…
Starting from a consideration of how the phonon frequency would change with the spin splitting of the conduction-electron energy bands in an itinerant-electron ferromagnet, we find that in the paramagnetic region the effect of the electron-phonon interaction makes the temperature dependence of the spin susceptibility…
ABSTRACT Reproduction in Rhoicosphenia curvata (Kütz.) Grun. is isogamous. The two auxospores formed expand parallel to the apical axes of the gametangial cells. Expansion is bipolar and leads to the formation of a slightly curved, tapering cell, in which the initial valves are laid down. The perizonium consists of tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of aqueous tetracyanoplatinate(2-)John W. Schindler, Robert C. Fukuda, and Arthur W. AdamsonCite this: J. Am. Chem. Soc. 1982, 104, 13, 3596–3600Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inissue 1 June 1982https…
This report reviews the possible effects of both radiation damage to the glass and of radiolysis of the leachant on the leaching behaviour of vitrified radioactive waste. It has been stimulated particularly by recent papers, which have suggested that the leach rates of glasses will be enhanced by large factors after a…
Abstract Die Aktivkorrosion von nichtrostendem Chrom‐Nickel‐Stahl X 5 CrNi 18 9 (Werkstoff Nr. 1.4301) in Schwefelsäure wird durch Schwefeldioxid sowie Schwefelwasserstoff stimuliert (Erweiterung des Potentialbereichs der Aktivkorrosion, Erhöhung der maximalen Korrosionsgeschwindigkeit im Aktivzustand und Erhöhung der…
Abstract The reaction of poly(vinyl alcohol) with styrylpyridinium and quinolinium salts which contain formyl group produced water‐soluble photosensitive polymers. The sensitivity was high, although the content of the styryl groups was extraordinarily low. Spectroscopical studies revealed that the high sensitivity is…
The water sorption, bound water, ionic conductivity, and chemical stability of polystyrene sulfonic acid (PSSA), polyethylenesulfonic acid (PESA), poly‐2‐acrylamido‐2‐methylpropanesulfonic acid (poly‐AMPS), and perfluorosulfonic acid (Nafion) have been determined. All the ion‐containing polymers investigated were foun…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical preparation of a Prussian blue analog: iron-ruthenium cyanideKingo Itaya, Tatsuaki Ataka, and Shinobu ToshimaCite this: J. Am. Chem. Soc. 1982, 104, 13, 3751–3752Publication Date (Print):June 1, 1982Publication History Published online1 May 2002Published inis…
Abstract Two random commercial ethylene‐propylene copolymers (EPM) with different ethylene content have been added to binary isotactic polypropylene (iPP)/high density polyethylene (HDPE) blends by melt mixing in a Brabender‐like apparatus. Impact Izod tests and a morphological analysis on the fractured surfaces of br…
Porphyrins appended with crown ether, benzo-15-crown-5, at the methine positions have been synthesized and \ncharacterized. The fully and partially substituted porphyrins and their metallo (Co, Cu, and Zn) derivatives describe one or more ether cavities in the periphery that are capable of recognizing spherical ca…
The filling of thin-walled glass capillaries is tedious and time consuming especially when the powder tends to agglomerate due to extremely fine grinding (<10 t~m) in a micronizing mill. While special devices have been designed for loading capillaries in a dry box (Larsen & Leddy, 1958; Lange & Haendler, 1972), a tech…
Abstract The human central nervous system pharmacology of cis -diamminedichloroplatinum (CDDP) was studied, and trials were initiated of CDDP as a radiosensitizer in the treatment of malignant primary brain tumors. Samples were assayed for platinum using X-ray-dispersive fluorescence spectrometry. Platinum was barely…