Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSynthesis, Crystal Structure, and Electronic Structure of a 5,15-Dialkylideneporphyrin: A TCNQ/Porphyrin HybridIain M. Blake, Harry L. Anderson, David Beljonne, Jean-Luc Brédas, and William CleggView Author Information Department of Chemistry, University of Oxford Dyso…
We propose a means of accounting for the contribution of counterions to the ionic strength within a polyelectrolyte brush, which is then incorporated into models treating the effects of electrostatic interactions, chain stretching, and curvature on the layer thickness for chains attached to a spherical particle. Combi…
In aspartate aminotransferase, pyridoxal 5'-phosphate (PLP) forms a Schiff base with the epsilon-amino group of Lys258 (internal aldimine). The internal aldimine has a pKa value of 6.8. Binding of a substrate amino acid to the enzyme yields the Michaelis complex, in which PLP still forms the internal aldimine with Lys…
The closely related crystal structures of the compounds La(6)Ni(2)Si(3) (La(12)Ni(4)Si(6), n = 2) and La(5)Ni(2)Si(3) (La(20)Ni(8)Si(12), n = 3) as well as those of the new compounds La(15)Ni(7)Si(10) (La(30)Ni(14)Si(20), n = 4) and La(21)Ni(11)Si(15) (La(42)Ni(22)Si(30), n = 5) were determined from single-crystal X-r…
A La0.7Ca0.3MnO3 thin film made by pulsed laser deposition (PLD) and another film of the same composition made by metal organic chemical vapor deposition (MOCVD), both on single crystal LaAlO3, were subject to a series of six, short, controlled anneals. The oxygen content was purposely not changed in the films from th…
A family of bis-urea derivatives has been synthesized and shown to function as effective gelators in certain organic solvents. The X-ray structure of one bis-urea shows a cylindrical hydrogen bonding network with extensive interdigitation of the alkyl esters which project from the central rod.
The luminescent properties of undoped ZnO quantum dots encapsulated in various stabilizing agents have been investigated at room temperature. Stoichiometric as well as non-stochiometric ZnO quantum dots have been prepared by different routes. These studies indicate the importance of OH radical on the surface of ZnO qu…
The gene glvA (formerly glv-1) from Bacillus subtilis has been cloned and expressed in Escherichia coli. The purified protein GlvA (449 residues, Mr = 50,513) is a unique 6-phosphoryl-O-alpha-D-glucopyranosyl:phosphoglucohydrolase (6-phospho-alpha-glucosidase) that requires both NAD(H) and divalent metal (Mn2+, Fe2+,…
Carboxylate-containing polyamides were synthesized from 2,6-di(amino)benzoic acid and dimethylmalonyl dichloride, isophthaloyl dichloride, and fumaryl dichloride. These polymers, {NHC 6 H 3 (COO)NHCOC(CH 3 ) 2 CO} n, {NHC 6 H 3 (COO)NHCO- m -C 6 H 4 CO} n, and {NHC 6 H 3 (COO)NHCO- trans -CH CHCO} n, have seven to eig…
The complete and original calculation scheme beyond the finite difference approximation, for the atomic (and orbital) Fukui function (FF) indices is proposed. The method explores an expansion for derivatives of LCAO coefficients, ∂C/∂N=CU. The separation scheme for the U matrix has been elaborated at the ab initio lev…
The (1- x )LaAlO 3 – x SrTiO 3 solid solution system with the perovskite structure was synthesized and its dielectric behavior was investigated. The lattice parameter of (1- x )LaAlO 3 – x SrTiO 3 increases with increasing the fraction of SrTiO 3 in the system. 0.45LaAlO 3 –0.55SrTiO 3 shows a dielectric constant ε of…
Molecular polarizabilities and hyperpolarizabilities of a series of octupolar molecules that are donor-substituted triphenylmethane dyes are calculated. The four-state model of an octupolar molecule is used to describe the nonlinear optical properties of this type of molecules. As the charge-transfer character of the…
Members of a panel of stress-responsive biosensors have been used to study the effect of megahertz frequency ultrasound on Escherichia coli. Insonification causes acoustic cavitation, the collapse of oscillating microbubbles in solution, which can damage bacterial cells. A focused 1-MHz ultrasound transducer, capable…
The electrochemical properties of several substituted terheterocycles thiophene−pyrrole−thiophene oligomers have been studied by cyclic voltammetry and double-potential-step chronoamperometry and then compared with the behavior of the corresponding pure terthiophenes. E ° and lifetimes of the cation radicals have been…
Zinc sulfide (ZnS) powders have been obtained by precipitation from homogeneous solutions of various zinc salt compounds, with S 2‐ as precipitating anion, formed by decomposition of thioacetamide. Spherical particles with a very narrow size distribution can be obtained by controlling the synthesis parameters. The par…
We have investigated the thermal and optical stabilities of the photoalignment layers for nematic liquid crystals (LCs). For the photoalignment layers, three kinds of photoisomerizable polymer systems were studied; a polyamic acid doped with azobenzene molecules, a side-chain-substituted polyamic acid with azobenzene…
A molecular dynamics simulation has been performed for a short chain-molecule system to study structure formation during the crystallization induction period. A model simulating n-alkane having 20 methylene units was used for the short-chain molecule. A model system containing either 250 or 2000 chains was quenched fr…
Base‐catalyzed hydrolysis and condensation of zinc acetate dihydrate in alcoholic environments yields highly concentrated ZnO colloids with molarities near 3 M (50–70 wt % solid content) and particle sizes between 3 and 6 nm. These solutions were optimized to be stable against coagulation for several months and to yie…
ABSTRACT This study was performed to describe an application of the vane method for the rapid, quantitative measurement of spreadability, a subjective, textural property. Yield points of thirteen commercial food items were determined and related to spreadability using models HBTDV‐I and 5X HBTDV‐I Brookfield viscomete…
Bone morphogenetic proteins (BMPs) were originally identified by their ability to induce ectopic bone formation and have been shown to promote both chondrogenesis and chondrocyte hypertrophy. BMPs have recently been found to activate a membrane serine/threonine kinase signaling mechanism in a variety of cell types, bu…