Materials Literature
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Abstract The expandability of K-depleted biotite and natural vermiculite was studied using transmission electron microscopy (TEM) and X-ray diffraction (XRD). K-depletion in layer-silicates was achieved by treating ultrathin sections with 0·1 m CaCl 2 and BaCl 2 solutions. The natural sample of biotite, which by XRD r…
An unconstrained simulation of the GTP-bound form of the H-ras protein p21 is performed in an aqueous environment with charge-neutralizing counterions. The simulation is compared to the 1.35-A structure of Pai et al. [(1990) EMBO J. 9, 2351] and a proposed alternate structure, in which the loop at residues 60-65 is mo…
The replacement and bypass of arteries of diameter greater than 6 mm with textile vascular prostheses has proved very successful since they were first introduced forty years ago. Although manufacturers continue to improve their products and make them of consistent quality for increased safety and performance and to fa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new fluorinated polyurethane: polymerization, characterization, and mechanical propertiesTai Ho and Kenneth J. WynneCite this: Macromolecules 1992, 25, 13, 3521–3527Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June…
Alkali-metal graphite intercalation compounds undergo a normal-to-superconducting transition at a critical temperature ${\mathit{T}}_{\mathit{c}}$ that increases with increasing alkali-metal concentration. Furthermore, the temperature dependence of the critical magnetic field ${\mathit{H}}_{\mathit{c}2}$ is linear dow…
Abstract An XPS study has been performed on samples of monometallic catalysts of palladium and platinum and on bimetallic Pd‐Pt catalysts supported on pumice. A negative shift of about 0.5 eV in the Pd 3d and Pt 4f binding energies of the catalysts relative to the energies of the same levels in the pure metals suggest…
N-type ZnO thin films with a crack and columnar-free structure were successfully prepared on p-type Si substrates by the sol-gel process. The current-voltage ( I-V ) characteristics of the heterojunction of n-ZnO/p-Si show a rectification with strong electrical breakdown strength of higher than 10 7 V/cm. The capacita…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemistry of rhodium and cobalt corroles. Characterization of (OMC)Rh(PPh3) and (OMC)Co(PPh3) where OMC is the trianion of 2,3,7,8,12,13,17,18-octamethylcorroleK. M. Kadish, W. Koh, P. Tagliatesta, D. Sazou, R. Paolesse, S. Licoccia, and T. BoschiCite this: Inorg. Che…
The preparation and solid-state characterization of the trifunctional radical 1,3,5-benzenetris(1,2,3,5-dithiadiazolyl) [4,4’,4”-(1,3,5-benzenetriyl)tris[1,2,3,5-dithiadiazolyl], 1,3,5-C6H3(CN2S2)3] are described. The crystals belong to the monoclinic space group P21/c, with a = 6.927 (2), b = 19.798 (3), c = 19.393 (…
The PRO3 gene of Saccharomyces cerevisiae encodes the 286-amino-acid protein delta 1-pyrroline-5-carboxylate reductase [L-proline:NAD(P+) 5-oxidoreductase; EC 1.5.1.2], which catalyzes the final step in proline biosynthesis. The protein has substantial similarity to the pyrroline carboxylate reductases of diverse bact…
Abstract The liquid and solid state tautomerism of 5,10,15,20‐tetraphenylporphyrin‐ 15 N 4 (meso‐tetraphenylporphyrin, TPP) has been studied by dynamic NMR spectroscopy and by NIR spectroscopy. The kinetic HH/HD/DD isotope effects on the liquid state tautomerism were reinvestigated in the temperature region between 20…
We present a new approach to yarn characterization and yarn tensile response based on fiber parameters such as strength and strain-at-break, length, and fineness. Yarn characterization is concerned with twist, linear density, and the ratio of experimental yarn unevenness to the Martindale's limit characteristic for sp…
Abstract It is shown that a quantitative description of the energy‐loss processes in a reflection electron energy‐loss spectroscopy (REELS) experiment cannot be obtained from a simple linear combination of pure bulk and pure surface components. A quantitative description can, however, be obtained within the dielectric…
The presence of three phases was found between SmA and the antiferroelectric SmC A * phase in optically active ( R )-4-(1-methylheptyloxycarbonyl)phenyl 4'-octylbiphenyl-4-carboxylate. Two of these phases were identified as SmC α * and SmC γ * by the miscibility test. The remaining phase between these was confirmed to…
In a systematic attempt to identify residues important in the folding and stability of T4 lysozyme, five amino acids within alpha-helix 126-134 were substituted by alanine, either singly or in selected combinations. Together with three alanines already present in the wild-type structure this provided a set of mutant p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelf-consistent theory of block copolymer blends: selective solventM. Banaszak and M. D. WhitmoreCite this: Macromolecules 1992, 25, 13, 3406–3412Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.…
The ternary complex of NAD-dependent formate dehydrogenase (FDH) from the methylotrophic bacterium Pseudomonas sp. 101 (enzyme-NAD-azide) has been crystallised in the space group P2(1)2(1)2(1) with cell dimensions a = 11.60 nm, b = 11.33 nm, c = 6.34 nm. There is 1 dimeric molecule/asymmetric unit. An electron density…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrical and physical properties of new electrically conducting quasi-composites. Poly(aniline-co-N-butylaniline) copolymersJean Yves Bergeron and Le H. DaoCite this: Macromolecules 1992, 25, 13, 3332–3337Publication Date (Print):June 1, 1992Publication History Published o…
Using high‐temperature solution calorimetry in molten 2PbO. B 2 O 3 , the enthalpy of reaction of the formation of zircon, ZrSiO 4 , from its constituent oxides has been determined: Δ r H 977 (ZrSiO 4 ) =−27.9 (± 1.9) kJ/mol. With previously reported data for the heat contents of ZrO 2 , SiO 2 , and ZrSiO 4 and standa…
The room‐temperature fracture behavior of polycrystalline MoSi 2 was characterized using Vickers indentation fracture. Fracture analysis was aided by the optically active grain structure of MoSi 2 revealed under polarized light. Radial crack propagation from indentations was found to be predominantly transgranular. Th…