Materials Literature
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The amino acid sequence of a single polypeptide chain, B-4, from fowl feather barbs has been determined. The B-4 chain was found to consist of 96 amino acid residues and to have a molecular weight of 10206 in the S-carboxymethylated form. The N terminus of this protein was an N-acetylserine residue. The B-4 protein co…
A mechanism for the toughening of brittle matrices with ductile particles is presented. It is shown that the constraints imposed on the particles by the rigid matrix suppress plastic deformation of the particles at crack tips so that the main contribution to composite toughness comes from ligament formation in the mat…
We describe highly accurate (0.2-1%) intensity measurements for the inelastic scattering of 75-keV electrons in \ensuremath{\sim} 1000-\AA{}-thick polycrystalline aluminum films in the region of (0.0-3.1)-${\mathrm{\AA{}}}^{\ensuremath{-}1}$ transferred wave vector and (0-100)-eV energy loss. The work was performed on…
The kinetics of grain growth in fully dense Al 2 O 3 with and without MgO solute additions were measured. The MgO was found to retard boundary migration and to rkvelop more uniform microstructures. A grain‐growth mechanism involving solute partitioning of segregated ions (calcium and magnesium) between different bound…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalixarenes. 10. OxacalixarenesBalram Dhawan and C. David GutscheCite this: J. Org. Chem. 1983, 48, 9, 1536–1539Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 May 1983https://pubs.acs.org/doi/10.1021/jo00157a033https://d…
Generalized relations relating multipole population parameters to d-orbital occupancies of transition-metal atoms are presented. The relations are cast in the form of a 15 × 15 matrix which reduces to smaller size for site symmetries higher than {\bar 1}. The matrix takes into account differences in normalization of d…
Abstract The impact fracture mechanisms of rubber‐toughened nylon are analyzed by measuring the energy dissipated in several different processes during notched fracture. An energy balance is thus established for the impact fracture. The stress‐whitened zone is shown to be the energy dissipation zone, having an energy…
Abstract The impact failure of blends of nylon 6,6 and low density polyethylene grafted with maleic anhydride (PEgMA) is discussed in terms of fracture morphology, composition, and particle adhesion and dispersion. Basic criteria for effective impact modification of these materials are developed. A numerical model for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen and carbonyl binding to iron(II) porphyrins: a comparison of the "picket fence" and "pocket" porphyrinsJames P. Collman, John I. Brauman, Brent L. Iverson, Jonathan L. Sessler, Roger M. Morris, and Quentin H. GibsonCite this: J. Am. Chem. Soc. 1983, 105, 10, 3052–30…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic aspects of the catalytic reduction of dioxygen by cofacial metalloporphyrinsRichard R. Durand Jr., C. Susana Bencosme, James P. Collman, and Fred C. AnsonCite this: J. Am. Chem. Soc. 1983, 105, 9, 2710–2718Publication Date (Print):May 1, 1983Publication History P…
Intima collagen was studied by electron microscopy (rotary shadowing and negative staining) and by analytical ultracentrifugation. It was found that the monomeric unit (Mr 170 000) consists of a 105 nm-long triple helix terminated by a small globular domain (Mr about 30 000) at one end and a large globular domain (Mr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of polystyrene, poly(2,6-dimethyl-1,4-phenylene oxide), and their brominated derivativesRoger P. Kambour, John T. Bendler, and R. C. BoppCite this: Macromolecules 1983, 16, 5, 753–757Publication Date (Print):May 1, 1983Publication History Published online1 May…
Abstract The ozonation products of a common rubber antiozonant, N-(1,3-dimethylbutyl)-N′-phenyl- p -phenylenediamine (HPPD), have been separated by liquid chromatography and identified by mass spectrometry. Three principal mechanisms appear to govern the ozonation of HPPD. Amine oxide formation leads to observed nitro…
Abstract Nickel compounds (NiCl2 and NiCl2(2,2′-bipyridine)) catalyze polycondensation of dihalothiophenes (2,5-dihalothiophenes, 2,4-dibromothiophene, and 3-methyl-2,5-dibromothiophene) by dehalogenation with magnesium to give the corresponding poly(thienylene) type polymers (poly(2,5-thienylene), poly(2,4-thienylene…
The growth of Pseudomonas oleovorans on n-octane was characterized by the formation of intracellular structures. These inclusions were isolated and characterized. Morphologically, they resembled the poly-beta-hydroxybutyrate granules found in Bacillus cereus, as shown by freeze-fracture electron microscopy. The elemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of barium sulfate-vanadium pentoxide-silica glass mixtures for preparation of sulfur dioxide in sulfur isotope ratio measurementsFumitake. Yanagisawa and Hitoshi. SakaiCite this: Anal. Chem. 1983, 55, 6, 985–987Publication Date (Print):May 1, 1983Public…
The enhancements of normal Raman scattering, resonance Raman scattering, and fluorescence from molecules adsorbed on identical, well-characterized, silver-island films are reported. The enhancement arises from the electromagnetic interaction between the molecules and the electronic plasma resonance of the silver islan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and properties of segmented polyether polyurethaneureasCarl B. Wang and S. L. CooperCite this: Macromolecules 1983, 16, 5, 775–786Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 May 1983https://pubs.acs.org/doi…
The contemporary state of the structural chemistry of the hydrides of intermetallic compounds is discussed. X-ray and neutron diffraction data on hydride phases are surveyed and critically analysed. Tetrahedral and octahedral coordination are shown to be most typical for hydrogen atoms in the structures of multi-compo…
Experiments involving competitive and cooperative adsorption of pyridine, ${\mathrm{Cl}}^{\ensuremath{-}}$, SC${\mathrm{N}}^{\ensuremath{-}}$, and Tl, and voltage induced resonance shifting show that the largest surface-enhanced Raman scattering intensity comes from complexes of these species adsorbed on defects which…