Materials Literature
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Changes in the structure of nylon 6 fibers annealed in dry and wet atmospheres were studied by small-and wide-angle x-ray diffraction. In the presence of water or saturated steam, fibers can be annealed to the same strucutral state at temperatures 70°C lower than in dry atmosphere. This is due to the enhanced mobility…
Abstract not Available.
SUMMARY A set of well‐drained soils in Galicia, formed from gabbros, amphibolites and schists, with udic moisture and mesic temperature regimes, are studied. All but one of the surface horizons show an‘exchange complex dominated by amorphous material’(ECDAM); consequently, most soils are classified as Andosols (FAO) o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChloride-binding reactions and electrochemistry of (tetraphenylporphyrinato)cobalt and chloro(tetraphenylporphyrinato)cobalt in dichloromethaneKarl M. Kadish, X. Q. Lin, and B. C. HanCite this: Inorg. Chem. 1987, 26, 25, 4161–4167Publication Date (Print):December 1, 1987Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, x-ray diffraction structure, magnetic properties, and MO analysis of a binuclear (.mu.-tetrathiooxalato)copper(II) complex, (AsPh4)2[(C3OS4)CuC2S4Cu(C3OS4)]Ramon Vicente, Joan Ribas, Santiago Alvarez, Alex Segui, Xavier Solans, and Michel VerdaguerCite this: Inorg…
Abstract The dehydroxylation of kaolinite has been investigated by isothermal thermogravimetry. Kinetic analysis using the Avrami equation shows that a combination of atomic mechanisms operates throughout the temperature range 734 K to 890 K. An empirical activation energy of 222 kJ mol -1 was calculated from the Arrh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin-crossover cobalt(III) complexes: steric and electronic control of spin stateWolfgang Klaeui, Werner Eberspach, and Philipp GuetlichCite this: Inorg. Chem. 1987, 26, 24, 3977–3982Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Publi…
The mechanism of nitric oxide reduction with ammonia to form N<sub>2</sub>, H<sub>2</sub>O, and N<sub>2</sub>O both in the presence and in the absence of O<sub>2</sub> over the following series of catalysts, unsupported V<sub>2</sub>O<sub>5</sub>, V<sub>2</sub>O<sub>5</sub> on TiO<sub>2</sub>, V<sub>2</sub>O<sub>5</su…
Infrared spectroscopy has been used to measure the concentrations of molecular CO_2, \nand carbonate in albitic (NaAlSi_3O_8) glasses quenched from melts equilibrated with CO_2, \nvapor at high pressures (15-30 kbar) and temperatures (1450-1625 °C). At constant temperature, \nthe concentrations of carbonat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of oxidic and reduced alumina-supported molybdate and heptamolybdate species by in situ laser Raman spectroscopyE. Payen, J. Grimblot, and S. KasztelanCite this: J. Phys. Chem. 1987, 91, 27, 6642–6648Publication Date (Print):December 1, 1987Publication History Publishe…
With an eye toward the development of nitroxides as potential contrast enhancing agents for MRI applications, we have compared the rates of reduction of 24 nitroxides of diverse structures by rat whole liver homogenate, hepatocytes, subcellular fractions, and ascorbate (10 eq excess). Our results indicate that five-me…
Abstract Several new minerals, structurally and chemically similar to the hydrotalcite-manasseite group, have been found in the saline deposits of the central pre-Caspian depression and in those of Middle Asia. Their structures consist of layers of (Mg 1-x Al x )(OH) 2 plus interlayers of anions and molecular water. I…
In this study, the adhesive exopolysaccharides of strains of Pseudomonas putida and P. fluorescens, both isolated from freshwater epilithic communities, were examined with regard to their chemical composition, biosynthesis, and their role in adhesion. Electron microscopy showed that both strains were enrobed in fibrou…
The electrochemical behavior of a range of Al‐Ga alloys was determined in 4 M NaOH and 2 M NaCl both under normal polarization conditions and in a small battery designed for viewing reacted anodes in a scanning electron microscope. The observed behavior was compared with that of gallium and Ga‐0.1% Al. It was found th…
The equations governing the small-signal response of relaxing, nonresonant systems which may be described by a distribution of relaxation times (DRT) and/or a distribution of activation energies (DAE) are summarized and generalized and their implications discussed for several popular distributions. Much past work, bot…
In inner-shell photoionization followed by Auger decay, the Auger electron initially screens the ionic Coulomb field ``seen'' by the photoelectron. This screening phenomenon affects the post-collision interaction that shifts the Auger energy and distorts the line shape. The analytical Auger electron line-shape formula…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReduction potentials and exchange reactions of thiyl radicals and disulfide anion radicalsParminder S. Surdhar and David A. ArmstrongCite this: J. Phys. Chem. 1987, 91, 26, 6532–6537Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMathematical treatment of the wall loss of a trace species in denuder and catalytic converter tubesDaniel M. Murphy and David W. FaheyCite this: Anal. Chem. 1987, 59, 23, 2753–2759Publication Date (Print):December 1, 1987Publication History Published online1 May 2002Publishe…
Peptidyl-prolyl cis-trans isomerase was extracted from pig kidney cortex and partially purified. Enzyme activity was monitored against the cis-trans isomerization of succinyl-Ala-Ala-Pro-Phe-methylcoumaryl amide by means of a two-step process using chymotrypsin as the trans cleaving activity. The in vitro refolding of…
The development of a new translation-function program is reported. It is one that uses a linear correlation coefficient to determine the correct position of an oriented molecule in the crystal cell. The method has been implemented in a computer program called BRUTE . The program can also refine the orientation of the…