Materials Literature
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The dynamics of concentration fluctuation in a deuterated polystyrene/poly(vinylmethylether) blend system has been studied by the temperature jump and also by the reverse quench light scattering techniques. The growth or decay rate R(q) in Cahn–Hilliard–Cook’s equation is almost proportional to the square of scatterin…
Absorption spectra and second-harmonic generation of Langmuir–Blodgett monolayers containing a hemicyanine dye with a large second-order hyperpolarizability are reported. The dye is found to be in the form of H aggregates in a pure-dye film and mostly monomeric in a 1:4 dye–arachidic acid film. This observation explai…
The 155 Gd Mossbauer effect and the magnetic properties were measured in the compounds GdCo 4 B, Gd 3 Co 11 B 4 , Gd 2 Co 7 B 3 and GdCo 3 B 2 . The crystal structures of all these compounds are related and can be thought to be built up by an ordered substitution of B atoms into the Co sites in GdCo 5 . The observatio…
The structure of native porcine pancreatic elastase in 70% methanol has been refined using film data to 1.65 A resolution, R = 0.169. A total of 134 molecules of water (but no methanol) has been refined. This structure, because of its native state and modestly high resolution, serves as the basis for comparison with o…
The physicomechanical properties of films of different thicknesses, made from methylcellulose and gelatinized maize starch, have been studied in tension. There was a linear relation between film thickness and tensile strength, toughness, elastic resilence and elongation at fracture. Young's modulus increased with decr…
The phase diagram of the proton glass Rb1−x(NH4)x H2PO4 has been evaluated as a function of composition, pressure and amount of deuteration within a random bond version of the Ising model in a transverse field and a replica symmetric mean field approach. It is shown that the presence of Gaussian random fields with zer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper(II), nickel(II), and cobalt(III) complexes with new macrocyclic ligands. 6,14-Dimethyl-1,5,9,13-tetraazacyclohexadeca-5,13-diene (Me2[16]diene) and C-meso- and C-rac-6,14-dimethyl-1,5,9,13-tetraazacyclohexadecane (C-meso- and C-rac-Me2[16]ane)Ramesh Bembi, Tapashi G.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectral characterization of the monomer-dimer equilibrium involving (meso-tetrakis(1-methylpyridinium-4-yl)porphinato)nickel(II) in dimethylformamideK. M. Kadish, D. Sazou, Y. M. Liu, A. Saoiabi, M. Ferhat, and R. GuilardCite this: Inorg. Chem. 1988, 27,…
A two‐dimensional mathematical model is presented for a lead dioxide electrode in a lead‐acid cell. It is used to simulate the time dependent behavior of the electrode during discharge. The model contains six dependent variables: the concentration of the acid electrolyte, the porosity, the electrical potentials of the…
The effect of nitrogen as a solid solution strengthening element in steel is well known, but is also generally associated with embrittlement. The present work describes the nitrogenation of nitrogen alloy stainless steel wire to produce material of high nitrogen content, which is shown to have beneficial effects on st…
The ligand PTP (3,6-bis(2-pyridylthio)pyridazine) generates both hydroxo- and halogeno-bridged, square-pyramidal, binuclear copper(II) complexes ([Cu 2 (PTP)X 4 ] (X = Cl (I), Br (II)); [Cu 2 (PTP)(OH)X 3 ] (X = Cl (IV), Br (V)), which are antiferromagnetically coupled. The hydroxo-bridged derivatives are more strongl…
Depending on the culture conditions, Pyrodictium occultum cells revealed two different types of fibers with significant differences in their width in the electron microscope. During growth on elemental sulfur preferentially fibres with a diameter of about 23 nm (type I) were produced. When elemental sulfur was substit…
Baileychlore occurs as dark green rims on colloform calcite veins within a strongly oxidized collapse karst-breccia containing altered andesite and garnet-vesuvianite skarn clasts at the Red Dome deposit near Chillagoe, Queensland, Australia. Baileychlore is a new Zn-rich chlorite. The ZnO contents are fairly uniform…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltrasonic PTC modification of poly(vinylidene fluoride) surfaces and their characterizationMarek W. Urban and Evelisse M. Salazar-RojasCite this: Macromolecules 1988, 21, 2, 372–378Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Publis…
In vitro mutagenesis techniques have been used to investigate two structure-function questions relating to the allosteric citrate synthase of Escherichia coli. The first question concerns the binding site of alpha-keto-glutarate, which is a structural analogue of the substrate oxaloacetate and yet has been suggested t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray absorption study of octafluorodirhenate(III): EXAFS structures and resonance Raman spectroscopy of octahalodirhenatesSteven D. Conradson, Alfred P. Sattelberger, and William H. WoodruffCite this: J. Am. Chem. Soc. 1988, 110, 4, 1309–1311Publication Date (Print):Februar…
The effects of dissolved impurities in simulated boiler water reactor (BWR) water on the intergranular stress corrosion cracking (IGSCC) of sensitized stainless steels (SSs) were studied by constant elongation rate tensile (CERT) tests with notched specimens. Impurities studied were sulfate, nitrate, chloride, and chl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnidentate vs bidentate acyl coordination: reactions of high-spin iron(II) alkyls with carbon monoxide and the crystal structure of the bidentate acyl Fe(.eta.2-COC6H2Me3)Br(CO)(dippe)Ann R. Hermes and Gregory S. GirolamiCite this: Organometallics 1988, 7, 2, 394–401Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of cross-links which occur during continuous chemical stress-relaxationKenneth T. GillenCite this: Macromolecules 1988, 21, 2, 442–446Publication Date (Print):February 1, 1988Publication History Published online1 May 2002Published inissue 1 February 1988https://pubs.a…
Abstract δ Valerolactone and ϵ‐caprolactone were reacted with BBr 3 , AIBr 3 , TiBr 4 , SnBr 4 or Bu 2 SnBr 2 in dichloromethane or chloroform in a 1 : 1 mole ratio. When these exothermic reactions were conducted with cooling, complexation of the lactones at the exocyclic oxygen was detectable by means of IR and 1 H N…