Materials Literature
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The structure of isocitrate dehydrogenase [threo-DS-isocitrate: NADP+ oxidoreductase (decarboxylating), EC 1.1.1.42] from Escherichia coli has been solved and refined at 2.5 A resolution and is topologically different from that of any other dehydrogenase. This enzyme, a dimer of identical 416-residue subunits, is inac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of cation substitution on the tantalum ditelluride distortionStephen Lee and N. NagasundaramCite this: Chem. Mater. 1989, 1, 6, 597–601Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989https://pubs.…
The luminescence of under x‐ray excitation is reported. Emission is observed from several manifolds. In some cases it is possible to distinguish between emission from Gd 3+ on the site and emission from Gd 3+ on the site.
Some of the factors that must be taken into account in designing with SF/sub 6/ are discussed. These factors include the effect of field inhomogeneities on the electrode which reduce the dielectric strength in SF/sub 6/ and the effect of SF/sub 6/ decomposition byproducts on the materials used in SF/sub 6/-insulated s…
Abstract Several series of novel compounds have been prepared containing dicyanomethylidene groups including 1‐alkyl‐3‐dicyanomethylideneindol‐2‐ones and 6,6‐dicyanofulvenes. Their visible absorption properties are recorded and discussed.
An enlarged set (atomic number Z = 2 to 98) of free-atom X-ray atomic scattering (form) factors for high angles [2 ≤ (sin θ)/λ ≤ 6Å-1] has been calculated based on those of Doyle & Turner [Acta Cryst. (1968). A24, 390-397]. Four-parameter 'exponential polynomial' fits for these are presented which give far more accura…
Highly crystalline Li x MoS 2 was synthesized, and the lithium content was electrochemically varied between x ~ 0 and x ~ 1. There were five different phases each with a different lithium content. The crystal lattices had small triclinic or monoclinic distortions from 1T-hexagonal symmetry. These discoveries contradic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic behavior of linear-chain organometallic complexes. Structural and magnetic properties of 1:1 decamethylferrocenium salts of planar radical anion bis(dithiolato)metalatesJoel S. Miller, Joseph C. Calabrese, and Arthur J. EpsteinCite this: Inorg. Chem. 1989, 28,…
Struvite and hydroxyapatite were precipitated from artificial urine onto the surfaces of catheter materials by the controlled addition of urease. They were precipitated both together and separately (by omitting components of the artificial urine), and with and without the inclusion of albumin (which was intended to mi…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and reactivity of oxovanadate anions in layered lithium aluminate materialsJen Twu and Prabir K. DuttaCite this: J. Phys. Chem. 1989, 93, 23, 7863–7868Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 Novembe…
A detailed redescription of the mechanically interacting structural elements of the lingual apparatus of the domestic chicken, Gallus gallus, revealed the functional and constructional role of organized connective tissue (i.e., ligaments and fasciae) as structural elements that ensure the proper biomechanical interact…
Abstract A theory is presented that allows detailed quantitative information on in‐depth concentration profiles to be extracted through analysis of surface electron spectra. The depth profile is determined from analysis of a single spectrum and the method is therefore fast and non‐destructive. The validity of the meth…
Values of coefficients related to the tilting of the oxygen octahedra in the low-temperature rhombohedral phase of the lead zirconate-titanate (PZT) solid solution system are needed in the development of a thermodynamic theory of the PZT system. In this paper these coefficients will be determined from experimental spo…
Through TEM observations it was established that particles of the positive active mass are heterogeneous in mass distribution. Using electron micro‐micro‐diffraction it was found that particles are built up of zones of crystal structure with various orientation, and of amorphous zones. The latter are more transparent…
The fundamental corrosion behavior of silicon carbide (SiC) ceramics was investigated after immersion in 290°C water solutions with different pH and dissolved‐oxygen concentrations. The weight loss in the oxygenated solution was more than that in the deoxygenated solution and was accelerated by increasing pH. Preferen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative studies of the photophysical properties of copper phenanthrolines: from Cu(dmp)2+ to the copper(I) catenatesAnn K. I. Gushurst, David R. McMillin, Christiane O. Dietrich-Buchecker, and Jean Pierre SauvageCite this: Inorg. Chem. 1989, 28, 22, 4070–4072Publication…
The microstructures of three ZnO varistor materials with different Bi2O3 contents have been evaluated by analytical electron microscopy in combination with x-ray diffractometry. The results have been correlated to microelectrode measurements, where breakdown voltages of individual ZnO junctions were measured, and also…
A new set of models for the stress effects in silicon oxidation is proposed. The most essential feature is the nonlinear shear-stress-dependent oxide viscosity which models a high-stress relaxation phenomenon similar to plastic deformation. The models are shown to agree well with the most comprehensive and quantitativ…
SUMMARY We show that the number of atoms in a small supported catalyst cluster can be estimated from the strength of electron scattering into a high angle annular detector in the STEM. The technique is related to the Z contrast methods developed by Crewe, Wall, Langmore and Isaacson. It works best for high atomic numb…