Materials Literature
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Two constitutive acetyl-CoA acetyltransferases (3-ketothiolases A and B) were purified from Alcaligenes eutrophus. Enzyme A was active with only acetoacetyl-CoA and 3-ketopentanoyl-CoA, whereas enzyme B was active with all the 3-ketoacyl-CoAs (C4−C10) tested. Enzyme A appeared to be a tetramer (Mr 70 000) with identic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of nickel(II) and copper(II) complexes of 14-membered hexaaza macrocycles, 1,8-dimethyl- and 1,8-diethyl-1,3,6,8,10,13-hexaazacyclotetradecaneMyunghyun Paik Suh and Shin Geol KangCite this: Inorg. Chem. 1988, 27, 14, 2544–2546Publication Date (Print)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[S4Cd17(SPh)28]2-, the first member of a third series of tetrahedral [SWMX(SR)y]z- clustersGarry S. H. Lee, Don C. Craig, Ida. Ma, Marcia L. Scudder, Trevor D. Bailey, and Ian G. DanceCite this: J. Am. Chem. Soc. 1988, 110, 14, 4863–4864Publication Date (Print):July 1, 1988P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteractions of metals and protons with algaeRay H. Crist, Karl. Oberholser, Dwight. Schwartz, James. Marzoff, Darryl. Ryder, and DeLanson R. CristCite this: Environ. Sci. Technol. 1988, 22, 7, 755–760Publication Date (Print):July 1, 1988Publication History Published online1…
The surface structure and properties of miscible blends of polystyrene (PS) with poly(vinyl methyl ether) (PVME) have been studied as a function of the blend composition and constituent molecular weights. The lower surface tension of the PVME compared to that of PS results in preferential adsorption of PVME at the sur…
A systematic study of the magnetic properties of a series of ${R}_{2}$${\mathrm{Fe}}_{14}$B (R denotes a rare-earth element) compounds has been made using a combined molecular-field and crystalline-electric-field (CEF) approximation. The Hamiltonian for an R ion is (in units of ${\ensuremath{\mu}}_{B}$) ${\mathrm{scrH…
The Shubnikov-de Haas (SdH) effect has been observed in the recently discovered ambient-pressure organic superconductor ${[\mathrm{b}\mathrm{i}\mathrm{s}(\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{y}\mathrm{l}\mathrm{e}\mathrm{n}\mathrm{e}\mathrm{d}\mathrm{i}\mathrm{t}\mathrm{h}\mathrm{i}\mathrm{o}\mathrm{l}\mathrm{o})\pha…
Serum transferrin is a metal-binding glycoprotein, molecular weight ca. 80,000, whose primary function is the transport of iron in the plasma of vertebrates. The X-ray crystallographic structure of diferric rabbit serum transferrin has been determined to a resolution of 3.3 A. The molecule has a beta alpha structure o…
Abstract The composition and the chemical states of components of Zircaloy‐4 (zirconium alloy) surfaces were studied in the temperature range between room temperature and 500°C. Each sample was kept at constant temperature (25, 100, 200, 300, 400, 500°C) for up to 16 hours. The changes of composition and chemical stat…
Experiments were performed on a compact tension specimen of AISI(1) 316L stainless steel (SS) to determine its susceptibility to intergranular environmentally assisted cracking in 288 C water. Crack growth rates were measured using a reversing DC potential drop technique as a function of mechanical loading variables i…
A comparative study of the AC (60 Hz) surface aging in a fog chamber is reported on cylindrical rod samples of high-temperature vulcanized (HTV) silicon rubber and ethylene propylene diene monomer (EPDM) rubber containing various amounts of alumina trihydrate (ATH) and/or silica fillers. In low-conductivity (250- mu S…
A graphical and numerical method of calculating and minimizing losses in windings, that generalizes previous findings, has been introduced. Using electromagnetic theory and MMF diagrams in both space and time a method is proposed that provides insight into the mechanism of skin and proximity effect losses and that als…
Experimental and theoretical cross-section data for electron impact ionization of atoms and ions from fluorine to nickel has been assessed and earlier recommendations for light atoms and ions have been revised. Based on this assessment and, in the absence of any data, on the classical scaling laws a recommended cross…
The static dipole polarizability and second hyperpolarizability tensors are calculated for polyene systems via ab initio coupled-perturbed Hartree–Fock theory. The effect of basis set augmentation on the calculated properties is explored for C4H6 and example basis sets are used to calculate the polarizability and seco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen peroxide oxidation catalyzed by heteropoly acids combined with cetylpyridinium chloride. Epoxidation of olefins and allylic alcohols, ketonization of alcohols and diols, and oxidative cleavage of 1,2-diols and olefinsYasutaka Ishii, Kazumasa Yamawaki, Toshikazu Ura,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdditive and nonadditive surface tension components and the interpretation of contact anglesC. J. Van Oss, R. J. Good, and M. K. ChaudhuryCite this: Langmuir 1988, 4, 4, 884–891Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published iniss…
Self-localized nonlinear excitations (solitons, polarons, and bipolarons) are fundamental and inherent features of quasi-one-dimensional conducting polymers. Their signatures are evident in many aspects of the physical and chemical properties of this growing class of novel materials. As a result, these polymers repres…
A simple model for the liquid glass transition is solved numerically. Results for ideal and non-ideal transitions are compared. The data show two or three different scaling regions for the density correlation function or the corresponding susceptibility spectra in agreement with previous analytical results.
to Thermal Analysis Techniques and Applications Edited by Michael E. Brown Chemistry Department, Rhodes University, Grahamstown, South Africa KLUWER ACADEMIC PUBLISHERS NEW YORK, BOSTON, DORDRECHT, LONDON, MOSCOW eBook ISBN: 0-306-48404-8 Print ISBN: 1-4020-0472-9 ©2004 Kluwer Academic Publishers New York, Boston, Dor…
The application of Raman spectroscopy to the analysis of dielectric films with respect to phase composition and homogeneity has been reported during the past several years. Interfacial strain at the film-substrate interface, which influences chemical bonding, also perturbs the vibrational spectrum and can be quantifie…