Materials Literature
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Poly-β-hydroxybutyrate (PBH) was recently shown to be produced in genetically engineered plants which expressed the genes from Alcaligenes eutrophus responsible for the formation of PHB from acetoacetyl-CoA. The transgenic plants accumulated PHB as granules which were similar in size and appearance to the bacterial PH…
In order to study the in vivo digestion of immobilized collagen and gelatin, these proteins labeled with 125I or fluorescein isothiocyanate (FITC) were covalently immobilized onto silicone surfaces, which were grafted with acrylic acid to introduce carboxyl groups, and implanted subcutaneously in rats and mice. When t…
We have determined the amino acid sequence of the alpha chain of a fibril-forming collagen from the body wall of the marine invertebrate Riftia pachyptila (vestimentifera) by Edman degradation. The pepsin-solubilized collagen chain consists of a 1011-residue triple-helical domain and short remnants of N- and C-telopep…
Resonant photoemission measurements have been performed on well characterized, stoichiometric (1012) surfaces of single-crystal Cr2O3 using synchrotron radiation. A strong resonant enhancement of the highest-lying valence-band states is observed across the Cr 3p → 3d excitation threshold. In light of the similarity of…
We report the synthesis and structure of a new, unusual indium manganese oxide, InMnO3, with a hexagonal layered structure containing manganese in trigonal bipyramidal coordination.
The structural model of tetragonal SeO 2 proposed by Mc- Cullough [JACS 59 (1937) 789] has been refined at 139 and 286 K. Space group P4 2 /mbc, Z = 8, M w = 110.96, a = 8.3218(9), c = 5.0541(6) A, V = 350.0(1) A 3 at 139 K and a = 8.3622(7), c = 5.0612(5) A, V = 353.9(1) A 3 at 286 K. 349 and 635 unique reflections r…
X-ray reflectivity, widths, centroid shifts and profiles for curved perfect crystals are calculated from a model. The crystal is approximated by a stack of perfect-crystal lamellae or blocks with a gradually changing (mean) orientation. A computer program has been developed to calculate the above quantities in the Joh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxation studies on water absorption of ethylene ionomersShinichi Yano, Kenji Tadano, Nobuaki Nagao, Shoichi Kutsumizu, Hitoshi Tachino, and Eisaku HirasawaCite this: Macromolecules 1992, 25, 26, 7168–7171Publication Date (Print):December 1, 1992Publication Hist…
Abstract Experimental alteration of volcanic glass has been carried out in distilled water at 200°C and 150°C. The formation and transformation processes of alteration products have been examined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), infrared abs…
We develop a phenomenological theory of the dynamic viscosity of colloidal suspensions, based on an extrapolation of the low-frequency behavior by use of a continued-fraction representation. In lowest approximation the dynamic viscosity depends on a small number of parameters, which may be determined experimentally. F…
An aluminum (Al) target was laser ablated in a nitrogen (N 2 ) atmosphere, producing aluminum nitride (AlN) powder. These powders were calcined at 900°C for 2 h. Powders were produced at various nitrogen pressures, and the calcined powders were tested for unreacted aluminum content, using differential thermal analysis…
β-Poly-l-malate (PMA) is a highly soluble polyanion specifically synthesized during the plasmodial stage of the life cycle in Physarum polycephalum. The polymer partitions in a growth-dependent fashion between cell nuclei, the cytoplasm and the culture medium, where it is slowly hydrolyzed. It strongly interacts with…
The photochemical bleaching of vertebrate rhodopsin results in the cis to trans isomerization of the 11-cis-retinal protonated Schiff base. Hydrolysis of the Schiff base leads to the formation of opsin and all-trans-retinal. In order for vision to proceed, the enzymatic trans to cis isomerization of a retinoid must oc…
Abstract For two high density polyethylene resins, the isothermal time dependency of extrudate swell has been measured. Very minor differences in the large molecular weight part of the molecular weight distribution, hardly detectable with gel permeation chromatography and low angle laser light scattering techniques, d…
Abstract The plasma copolymerization of ethylene (ET) and tetrafluoroethylene (TFE) was investigated by means of IR and XPS analyses. The deposition rates for plasma ET/TFE copolymers, when plotted versus mol % TFE in the feed gas, gave a concave‐downward curve situated above the straight‐line joining the deposition r…
Abstract Crystallographic studies of micro-inclusions in diamond coat, carried out by analytical electron microscopic techniques, show that structures possessing rhombohedral symmetry form a significant fraction of the population of well-crystaUised particles. They are, however, less frequent than apatite or biotite,…
Shape memory alloy reinforced composites are an extremely versatile class of materials with adaptive characteristics that may be exploited for damage control, active structural acoustic control, dynamic tuning, and shape control. In order to design structures reliably with embedded shape memory alloy actuators, a fund…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of seven-coordinate tantalum(I) and niobium(I) complexes with cis carbonyl and alkyl isocyanide ligandsEdmund M. Carnahan, R. Lynn Rardin, Simon G. Bott, and Stephen J. LippardCite this: Inorg. Chem. 1992, 31, 25, 5193–5201Publication Date (Pri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformations of polymer melts between parallel surfaces: comparison of the Scheutjens-Fleer lattice theory with Monte Carlo simulationsGrant D. Smith, Do Y. Yoon, and Richard L. JaffeCite this: Macromolecules 1992, 25, 25, 7011–7017Publication Date (Print):December 1, 1992P…
Abstract Perfluoro(vinyl ether) derivatives are extremely versatile monomers in preparing a variety of functional fluoropolymers. In this paper, two challenging topics in the development of novel fluoropolymers will be introduced. Carboxylated perfluoro(vinyl ether) can be copolymerized with tetrafluoroethylene to aff…