Materials Literature
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The structure of the P2(1) crystal form of adenylosuccinate synthetase from Escherichia coli has been determined to a resolution of 2.8 A. The refined model for the enzyme gives an R factor of 0.20 and a root-mean-square deviation from expected bond lengths and angles of 0.016 A and 2.27 degrees, respectively. The dom…
The influence of rare‐earth additives, such as La, Nd, Sm, and Gd, and poling conditions on the electromechanical properties of (Pb 1−3 x /2 Ln x )(Ti 0.98 Mn 0.02 )O 3 compositions, x = 0.04–0.12, were investigated. The type and amount of additive were found to affect the lattice anisotropy, dielectric constant, and…
The relationship between micrograin structures and electrical characteristics of sputtered indium tin oxide (ITO) films was investigated. Micrograin structures were observed by a high resolution scanning electron microscope. Electrical characteristics were evaluated by four point probe resistance measurement and Hall…
Of the various types of synthetic metals , intrinsically conducting polymers (once discovered) quickly became te materials most frequently studied, owing to their properties, structural variability, and great potential for commercial applications. This month's essay traces the progress made in their investigation duri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralizing the metallacrown analogy: ligand variation and solution stability of the VVO 9-metallacrown-3 structure typeBrian R. Gibney, Ann J. Stemmler, Steffen Pilotek, Jeff W. Kampf, and Vincent L. PecoraroCite this: Inorg. Chem. 1993, 32, 26, 6008–6015Publication Date (…
Platinum and ruthenium oxide (RuO2) deposited by ion beam sputter-deposition are evaluated for use as electrodes for PZT thin film capacitors. The effect of deposition temperature, film thickness, and the presence of oxygen on hillock formation in platinum is discussed. It is shown that the hillock density in Pt/Ti/Si…
We derive Green–Kubo (GK) relations for the viscosity coefficients of nematic liquid crystals. These GK relations are similar to, but considerably more complicated than, those of an isotropic fluid. In addition to shear viscosities there are also twist viscosities and cross couplings between the symmetric strain rate…
Rat liver mitochondrial fatty acid oxidation multienzyme complex consists of 4 mol of the alpha-subunit and 4 mol of the beta-subunit, and has three enzyme activities of long chain enoyl-CoA hydratase, long chain 3-hydroxyacyl-CoA dehydrogenase, and long chain 3-ketoacyl-CoA thiolase. The following cDNA clones for the…
Abstract The connection of symmetry groups, their irreducible and band representations for the models of finite and infinite crystals is considered in detail. The relation between localized (electronic and vibrational) states of finite and infinite crystals is studied on models. It is found that the Wannier states of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN,N'-Bis(p-ethynylphenyl)pyromellitimide: a new processable, high-Tg rigid rod heat-resistant polymer precursor with no polymerization shrinkageAnastasios Melissaris and Morton H. LittCite this: Macromolecules 1993, 26, 25, 6734–6740Publication Date (Print):December 1, 1993P…
Abstract In this study, the effect of the particle size of solid protective agent, commercially obtained and in‐situ formed tricalcium phosphate (TCP), on the particle size of suspension polymerized polystyrene (PS) is investigated. It is concluded that when a solid protective agent like TCP is used, its particle size…
Abstract Watanabeite Cu 4 (As,Sb) 2 S 5 , in which As>Sb, is a new copper sulphosalt that occurs with quartz in a hydrothermal vein at the Teine mine, Sapporo, Hokkaido, Japan. It is silvery lead-grey in colour with lead-grey streak. VHN 100 = 253-306 kg/mm 2 , brittle. It has no cleavage and the fracture is uneven…
The 4f-4f transitions absorb electric dipoles, magnetic dipoles, or even higher electrical multiple radiations. These electric dipole transitions in the 4fn configuration are parity forbidden, however, as a result of the interaction of the central lanthanoid ion and surrounding ligands mixing into a 4fn con- figuratio…
Abstract In computer modeling of air guns the theory is often based on the assumption of an ideal freely oscillating spherical air bubble in an ideal fluid. Theoretical and experimental air-gun signatures do not match perfectly. Synthetic signatures are underdamped compared to real signatures. Several physical effects…
A nanocrystal structure and non-equilibrium solid solution of Fe-20 at.% Cu has been obtained after severe plastic deformation and additional heating. Thin disc samples were pressed at up to 11 GPa between Bridgman anvils and then deformed by rotating one anvil about the other. Cu does not normally form a solid soluti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus-mediated gold aggregation on a metal cluster: syntheses, structures, dynamic behavior, and ligand addition reactions of the clusters (.mu.-H)nFe3(CO)9P[Au(PR3)]3-n (n = 0, 1, 2)Deborah L. Sunick, Peter S. White, and Cynthia K. SchauerCite this: Inorg. Chem. 1993,…
Abstract The main objective of this investigation is to obtain experimental data for the sulfuric acid hydrolysis of cotton and mechanically pretreated cotton fibres. These data indicate that some glycosidic bonds of cellulose have very high accessibility to catalytic ions. It was also shown that milling increases the…
The electron density in a naturally faced mineral crystal of MgCO 3 was re-measured with Mo Kα (λ= 0.71073 A) diffraction data, using extinction corrections that minimize differences between equivalent reflection intensities. The deformation electron density has 0.66 e A -3 , density maxima in the C-O bonds and 0.35 e…
Complete replacement of Cu by Fe in R${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ leads to R${\mathrm{Ba}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{O}}_{8}$ (R=Y and Eu). We investigated ${\mathrm{YBa}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{O}}_{8}$ and ${\mathrm{EuBa}}_{2}$${\mathrm{Fe}}_{3}$${\mathrm{O}}_{8}$ by seve…
The behaviour of specular reflectance of cobalt oxides on metal has been studied theoretically (CoO/Co system) and experimentally (Co3O4/Co system; the thin films are obtained by chemical spray pyrolysis) in the infrared region. CoO may be identified by a LO mode at 585 cm-1 and by a TO mode at 345 cm-1. Co3O4 is char…