Materials Literature
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A cDNA sequence from Schizosaccharomyces pombe with similarity to 6,7-dimethyl-8-ribityllumazine synthase was expressed in a recombinant Escherichia coli strain. The recombinant protein is a homopentamer of 17-kDa subunits with an apparent molecular mass of 87 kDa as determined by sedimentation equilibrium centrifugat…
Double layered vanadium oxide metal coordination complexes, [Ni(bipy)(H2O)V2O6]∞1 and {[Ni(bipy)2]2V6O17}∞2, have been isolated from the same hydrothermal reaction container. X-Ray crystallography shows that 1 consists of unique two-dimensional layers constructed from a vanadium oxide chain {V2O6}2n−n and covalently l…
This perspective reviews experiments in which spectroscopy rather than scattering is used to probe reactive potential energy surfaces. The application of negative ion photodetachment to the transition state spectroscopy of benchmark reactions is described, followed by a brief description of recent transition state spe…
The polymerization of bis(4-ethynylphenyl)methylsilane catalyzed by RhI(PPh3)3 afforded a regio- and stereoregular hyperbranched polymer, hb-poly[(methylsilylene)bis(1,4-phenylene-trans-vinylene)] (poly(1)), containing 95% trans-vinylene moieties. The weight loss of this polymer at 900°C in N2 was 9%. Poly(1) displaye…
Acoustic emission (AE) is investigated during cycling at a constant plastic strain amplitude of ultrafine-grain (UFG) copper produced by severe plastic deformation, aiming at detailed characterization of AE in the time and frequency domain and clarification of fatigue damage mechanisms. The results of AE analysis in U…
Cu thin films have been deposited on Si (100) substrate by using a non-mass-separated ion beam deposition (IBD) system. The effect of the substrate bias voltage on the properties of the deposited films was investigated using X-ray diffraction, resistivity measurement and field emission scanning electron microscopy. In…
A liquid crystalline vanadyl complex has been studied by DSC, polarizing optical microscopy, the reversal current technique, X-ray diffraction and frequency domain dielectric spectroscopy. The compound exhibits three columnar phases: rectangular ordered (Colro), rectangular disordered (Colrd), and hexagonal disordered…
The phase transitions of α‐Si 3 N 4 and β‐Si 3 N 4 have been investigated by shock compression through the recovery technique and Hugoniot measurements. α‐ and β‐Si 3 N 4 are transformed into a cubic spinel structure ( c ‐Si 3 N 4 ). The yield of c ‐Si 3 N 4 increases with increasing shock pressure and reaches 100% at…
The optical and electrical characteristics of microdischarge devices and arrays fabricated in semiconductors and metal/polymer structures are described. Devices as small as (10 /spl mu/m)/sup 2/ in emitting area (nanoliters in volume) and arrays as large as 30 /spl times/ 30 have been demonstrated and operated at gas…
The preparation and characterization of a Keggin-type, novel di-TiIV-1,2-substituted polyoxotungstate are described. The dimeric, Ti–O–Ti bridged anhydride form of the di-TiIV-1,2-substituted α-Keggin polyoxotungstate, K10[α,α-P2W20Ti4O78]·12H2O 1, was unexpectedly found in the varied molar-ratio reactions of tri-lacu…
New technologies, incorporating the platinum group metals, are available to meet the exhaust emission regulations for cars, light-duty and heavy-duty vehicles and motorcycles being adopted by the European Union for implementation during the new century. These technologies include low light-off catalysts, more thermall…
Specimen geometries have been developed to determine the mechanical properties of irradiated Zircaloy cladding subjected to the mechanical conditions and temperatures associated with reactivity-initiated accidents (RIA) and loss-of-coolant accidents (LOCA). Miniature ring-stretch specimens were designed to induce both…
A series of stereospecifically assembled configurational chiral heterometal dinuclear 3d–4f complexes (Λ-Δ)-[(acac)2Cr(ox)Ln(HBpz3)2] (acac− = acetylacetonate, ox2− = oxalate, HBpz3− = hydrotris(pyrazol-1-yl)borate; Ln(III) = La, Nd, Sm, Ho, Er and Tm: (Λ-Δ)-Cr(ox)Ln, where (Λ-Δ) implies the absolute configuration aro…
The dc conductivity and thermo-electric power of a-Se 80x In x (x = 5, 10, 15, 20, 30) and a-Se 80x Ge 20 In x (x = 0, 5, 10, 15, 20) thin films are reported in the present work. The free-charge-carrier concentration is calculated with the help of dc conductivity and thermo-electric power measurements. The calculate…
The aim of this study was to investigate the effects of three steroidal glycosides (SG-100, SG-280, and SG-460) obtained from Polygonatum odoratum (Mill.) Druce. on insulin secretion, insulin action, and relative glucose uptake in various tissues of 90% pancreatectomized male Sprague-Dawley rats. One of the compounds…
Abstract Results from ab initio Hartree–Fock and gradient‐corrected density functional theory calculations of formic acid interactions with ZnO (10 1 0) surfaces are reported. Surface relaxation is found to affect equilibrium geometries and adsorption energies significantly. Large variations in adsorption energy with…
A new transition metal thioantimonate(III) with composition Mn 2 (H 2 N(CH 2 ) 2 NH 2 )Sb 2 S 5 has been synthesised under solvothermal conditions. Two trigonal SbSb 3 pyramids and two octahedrally coordinated Mn atoms are interconnected to form Mn 2 SbS 4 heterocubanes as secondary building units (SBU’s). The SBU’s a…
The amphiphilic 5,11,17,23-tetrakis(1,1,3,3-tetramethylbutyl)-25,26,27,28-tetra(carboxymethoxy)calix[4]arene, 1, forms stable monolayers at the air–water interface which can be employed as supramolecular templates for induced calcite crystallization. Uniform, (012) oriented CaCO3 (calcite) single crystals grow underne…
In order to achieve low temperature superplasticity at relatively high strain rate in magnesium alloys, Mg–10 mass%Li–1 mass%Zn (LZ101) α+β two phase alloy was subjected to ECAE (Equal Channel Angular Extrusion) processing and tensile tests of the obtained specimens of the alloy were carried out to investigate the sup…
Crystals of (Cl2C3NS)(ClC2NS2), an isothiazolyl-substituted 1,2,3-dithiazolyl radical, consist of evenly spaced, slipped pi-stacks; magnetic and conductivity measurements indicate the material is a Mott insulator with sigma RT = 2 x 10(-7) S cm-1.