Materials Literature
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The crystal structure analysis of the low temperature phase of SrTiO 3 has been made at 77 K using the method of X-ray oscillation photograph. The space group is determined as I4/mcm and the rotational shift of oxygen octahedra with respect to Sr ion frame is by 1.6°; this is slightly larger than those estimated from…
Abstract This work is concerned with the change of viscoelastic properties of poly(vinyl chloride) (PVC) plastisol during heating. The system changes from a suspension of solid particles in a liquid medium to a swollen gel and further to a fused state as the temperature is raised. The Rheometrics mechanical spectromet…
Particle-stimulated nucleation of recrystallization in copper-silver alloys containing silica particles has been studied by high-voltage electron microscopy. Both bulk annealed and in situ annealed specimens have been examined and the results compared with those obtained from similar studies of deformed aluminium. Rec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron transfer and ligand substitution reactions of the ion pentacyano(4-aminopyridine)ferrate(II)Nicolas V. Hrepic and John M. MalinCite this: Inorg. Chem. 1979, 18, 2, 409–413Publication Date (Print):February 1, 1979Publication History Published online1 May 2002Publishe…
Phosphoglycerate mutase of Bacillus subtilis was purified to apparent homogeneity. It specifically required manganese ions for stability and activity, but it does not need 2,3-diphosphoglycerate as cofactor; the Km for Mn2+ is about 4.5 micrometer. Enzyme activity was inhibited by heavy-metal ions, 2,3-butanedione, an…
The diffuse-cone model, developed on the basis of the existence of orientational disorder in smectic phases, is valid for all smectic A and C phases, and also, with appropriate modifications, for all other smectic phases. The fundamental angular parameter is not the optical tilt angle τ, but the preferred molecular ti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical oxidation of some mesocyclic dithioethers and related compoundsGeorge S. Wilson, Dale D. Swanson, Jacob T. Klug, Richard S. Glass, Michael D. Ryan, and W. Kenneth MuskerCite this: J. Am. Chem. Soc. 1979, 101, 4, 1040–1042Publication Date (Print):February 1, 1…
Abstract It is shown that under conditions of uniaxial creep the fracture of high density polyethylene can be categorized as one of three types, depending upon the magnitude of the applied load, molecular architecture, and environment. When subjected to relatively large loads, the specimens neck and then fracture almo…
Cathodoluminescence of Sm 3+ , Eu 3+ , and Yb 3+ in is known to be enhanced by a trace of Tb 3+ or Pr 3+ . Nd 3+ , Gd 3+ , Dy 3+ , Ho 3+ , Er 3+ , and Tm 3+ show similar enhancement of efficiencies by addition of Tb 3+ or Pr 3+ . For an electron beam with a current density of about 10 −4 A/cm 2 , in a raster of about…
Abstract Alkylammonium ion exchange on mixed-layer minerals gives detailed information about the variation of cation density in succeeding interlayer spaces. Three mixed layer samples from Japan (supplied by Dr. H. Kodama) were investigated. Their nearly 1:1 interstratification is based on regularly alternating high-…
The nature of the interface between anodically grown oxide films and gallium arsenide substrates was studied using Raman backscattering. Room-temperature spectra of GaAs covered with as-grown anodic films as well as anodized samples dried under nitrogen at 250°C showed only the first-order longitudinal (LO) and transv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparations and properties of nitrosyl complexes of iron tetramethylcyclam. X-ray structures of [Fe(C14H32N4)NO](BF4)2, a S = 3/2-1/2 spin-equilibrium complex, and [Fe(C14H32N4)(NO)(OH)](ClO4)2.CH3CNKeith D. Hodges, R. G. Wollmann, S. L. Kessel, D. N. Hendrickson, D. G. Van…
Abstract The three isomorphic forms of collagen present in muscle have been located by indirect immunofluorescence using collagen type specific antibodies. Type I collagen was located in the epimysium and perimysium, type III primarily in the perimysium as fine lace‐like fibres, and type V virtually confined to the en…
Abstract The steady state demixing of an initially homogeneous oxide solid solution (A, B)O in an oxygen potential field is studied theoretically and experimentally. In case that D A > D B ≫ D 0, the crystal is shifted with respect to the oxide lattice system toward the higher oxygen potential and is enriched in A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic spectroscopy of polyatomic molecules by low-energy, variable-angle electron impactAron. Kuppermann, Wayne M. Flicker, and Oren A. MosherCite this: Chem. Rev. 1979, 79, 1, 77–90Publication Date (Print):February 1, 1979Publication History Published online1 May 2002P…
Abstract The texture and the pore size distribution of a set of styrene divinylbenzene copolymers, prepared by suspension polymerization with various compositions and various amounts of ethyl‐2‐hexanoic acid as diluent, have been studied using nitrogen adsorption‐desorption isotherms, mercury porosimetry, and scanning…
The crystal structures of a number of globular proteins are currently available. An analysis of the distribution of side-chains among different allowed conformations in these proteins has been carried out. The observed conformations of individual residues are discussed on the basis of well-known stereochemical criteri…
Collagenous substrates are reported to promote the accumulation of extracellular matrix materials by epithelia in culture. Glycosaminoglycan (GAG) metabolism is compared in secondary cultures of mouse mammary epithelial cells maintained on plastic or type I collagen gel substrates. The incorporation of 35SO42- into GA…
Abstract A model is presented in which the appearance of displacive phase transitions is explained by short‐range internal forces. Electrically charged or uncharged parts of the structure are squeezed out of symmetrical positions and thus lead to a symmetry‐lowering and to phase transitions of ferroelectric or pure st…
Abstract Resonance and pre‐resonance Raman spectra are presented for the 1:1 and 3:1 solid complexes of perylene with tetracyanoquinodimethane (TCNQ). Selective resonance enhancement was observed for perylene. A study of the frequency dependence of the Raman intensities shows that, although these are weak complexes, c…