Materials Literature
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In a previous paper, we reported identification of the 5' part of hprA of Methylobacterium extorquens AM1, which encodes the serine cycle enzyme hydroxypyruvate reductase (L. V. Chistoserdova and M. E. Lidstrom, J. Bacteriol. 174:71-77, 1992). Here we present the complete sequence of hprA and partial sequence of genes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on Conjugated Polymers: Preparation, Spectroscopic, and Charge-Transport Properties of a New Soluble Polythiophene Derivative: Poly(3',4'-dibutyl-2,2':5',2''-terthiophene)Chenggang Wang, Michael E. Benz, Eugene LeGoff, Jon L. Schindler, Joyce Allbritton-Thomas, Carl…
The in situ breaking stresses of pulled‐out fibers on the fracture surface of a fiber‐reinforced composite can be determined ex post facto from a measurement of the fracture mirrors on the surfaces of the fibers. Here, the relationship between the resultant distribution of breaking stresses and the true in situ fiber…
A very smooth amorphous molybdenum oxide thin film can be fabricated easily by a spin‐coating technique using a solution of peroxo‐polymolybdic acid, which is formed by the direct reaction of metallic molybdenum with hydrogen peroxide. Amorphous resulting from heating such a film at 80–150°C exhibited reversible elect…
Interest in molecular magnets has so far mainly been confined to scientific aspects, but their potential technological applications are wide ranging. Here their use in lightweight transformers and generators, magnetic shielding, and magnetic and magneto‐optic recording media are discussed. The Figure shows a powder sa…
The role of steric crowding of peripheral substituents in causing nonplanar distortions of the porphyrin macrocycle has been investigated in a series of nickel(II) meso-nitrooctaethylporphyrins as models for protein-induced nonplanar distortions of metal-tetrapyrrole cofactors. UV-visible absorption spectra, resonance…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRoles of Surface Oxygen Groups on Poly(acrylonitrile)-Based Active Carbon Fibers in SO2 AdsorptionSeiki Kisamori, Isao Mochida, and Hiroshi FujitsuCite this: Langmuir 1994, 10, 4, 1241–1245Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Pu…
Preclinical experiments with liposome-encapsulated anthracyclines indicate that this form of delivery may be effective in decreasing the cardiotoxic effect of these drugs. The tumor drug levels and the antitumor efficacy of anthracyclines in a number of mouse models are significantly enhanced by delivery in long-circu…
Bananas, Musa (AAA group, Cavendish subgroup) ‘Giant Cavendish’, were ripened in a biotron at 25°C with ethylene during 4 days. Changes in mechanical properties of pulp were detected by a stress‐relaxation technique. The decrease in T 0 , the parameter for minimum stress‐relaxation time, began between day 0.5 and 1, w…
Abstract Diffuse reflectance spectra of kaolins have been recorded in samples from different environments. They show the systematic presence of Fe-oxides, even in bleached kaolins, with no contribution from the Fe 3+ ions substituted in kaolinite. Second derivative spectra of various Fe-phases (hematite, goethite, lep…
Effects of strong electron correlation on the electron-lattice interaction are studied by means of the exact diagonalization method for a finite-size cluster system. A simple two-component tight-binding Hamiltonian with the intrasite and intersite Coulomb repulsions is adopted. Upon changing the correlation energy (U)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Morphology and Phase Identifications in Poly(aryl ether ketone)s and Their Copolymers. 1. Polymorphism in PEKKRong-Ming Ho, Stephen Z. D. Cheng, Benjamin S. Hsiao, and Kenncorwin H. GardnerCite this: Macromolecules 1994, 27, 8, 2136–2140Publication Date (Print):April…
The guided-mode resonance characteristics of dielectric waveguide gratings are presented. The sharp resonance features predicted theoretically are experimentally observed in the microwave region (4-18 GHz) and are shown to be in agreement with theory.>
Antimony‐doped tin oxide films were prepared on Corning glass substrate by chemical vapor deposition from a gas mixture of SnCl 4 –SbCl 5 –H 2 O. The electrical conductivity and optical transmission of tin oxide films were studied with antimony doping. The film conductivity increased largely without losing optical tra…
The effect of urea on the crystal structure of hen egg-white lysozyme has been investigated using X-ray crystallography. High resolution structures have been determined from crystals grown in the presence of 0, 0.7, 2, 3, 4, and 5 M urea and from crystals soaked in 9 M urea. All the forms are essentially isomorphous w…
A modified envelope method, which includes the consideration of the light intensity loss from the back surface of the substrate, was developed and shown to be a simple and convenient tool for obtaining the optical properties and the thickness of the film by using the transmission spectra alone in the medium and weak a…
Molecular-dynamics simulations of porous silica, in the density range 2.2--0.1 g/${\mathrm{cm}}^{3}$, are carried out on a 41 472-particle system using a multiple-instruction multiple-data parallel computer. An effective interatomic potential consisting of two-body and three-body covalent interactions is used. Structu…
Partial discharge (PD) measurements have been carried out over the years to assess insulation systems in power apparatus for their integrity and design deficiencies. Digital PD recording, processing and its presentation as 3-d patterns are recent trends in both industry and testing laboratories. Interpretation of thes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of New Low-Dimensional Quaternary Compounds, KCu2AsS3 and KCu4AsS4, in Supercritical Amine Solvent. Alkali Metal Derivatives of SulfosaltsJames E. Jerome, Paul T. Wood, William T. Pennington, and Joseph W. KolisCite this: Inorg. Chem. 1994, 33, 9, 1733–1734Publicat…
The elastic behavior of a weakly aggregating polystyrene latex dispersion was investigated using a homemade controlled stress rheometer and commercially available dynamic rheometers. Both the creep measurements and the oscillatory experiments show the absence of a yield stress. The low-shear-limiting viscosity obtaine…