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In continuation of our earlier work on smectogenic compounds exhibiting large bilayer spacings, we report in this paper a comparative study of several compounds with lateral methyl or methoxy substituent. Some of the compounds do not have any strongly polar end groups while others have a cyano end group. The dielectri…
Abstract The structure and the absolute configuration of a new C-15 bromoallene, which has been isolated from the red alga Laurencia okamurai Yamada, were confirmed by X-ray crystallographic analysis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer effect and x-ray diffraction at the high-spin (5T2) .dblharw. low-spin(1A1) transition in bis(thiocyanato)bis(4,7-dimethyl-1,10-phenanthroline)iron(II)-.alpha.-picoline: thermal hysteresis, associated crystallographic phase change, time dependence of 5T2 .fwdarw.…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEuropium(III) luminescence excitation spectroscopy. A species-specific method for the quantitation of lanthanide ion binding to chelating agents. Complexes of (1,2-ethanediyldioxy)diacetateMichael Albin, Gregory K. Farber, and William DeW. Horrocks Jr.Cite this: Inorg. Chem.…
Abstract Analytical transmission electron microscopy was applied to some authigenic chlorites occurring as grain coatings in sandstones. Compositional variation proved to be relatively slight: all were magnesian chamosites. The coating chlorites were often intimately mixed with extremely fine-grained (0·01–0·2 µ m) he…
The propensity of thermally stabilized Inconel 600 to undergo low temperature stress corrosion cracking (SCC) in sulfur bearing environments has been investigated with U-bends and slow strain rate testing. The results have been compared with those of sensitized Inconel 600. The potential dependence of crack propagatio…
Gas phase core and valence electron spectra from UF6, excited by AlKα monochromatized x rays, in the binding energy range 0–1000 eV are presented. It is shown that the AlKα excited valence electron spectrum can be used to reassign the highest occupied molecular orbital (HOMO) in UF6. Many-body effects on the core leve…
Abstract Measurements of the dielectric constant and loss factor of polyvinyl chloride (PVC) have been made over a wide range of temperature and frequency. Maxima in dielectric loss were observed at a temperature corresponding to the α or glass transition temperature and secondary β transition temperature. The sensiti…
We present band structure calculations on neutral polypyrrole. The calculations are performed at the Hartree–Fock ab initio level with the use of a program specifically adapted for polymer applications. The density of states computed from the band structure compares very well with the UPS data on neutral polypyrrole.
Coefficients of helium migration, coefficients of thermal expansion, and glass-transition temperatures were measured for several series of alkali alkaline-earth phosphate glasses. The helium permeability decreases with the field strength of alkali or alkaline-earth ions in the order Na+ > Li+ and Mg2+ > Ca2+ > Ba2+. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer self-diffusion: dynamic light scattering studies of isorefractive ternary solutionsJames E. MartinCite this: Macromolecules 1984, 17, 6, 1279–1283Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June 1984https://p…
Monosized spheroidal doped TiO2 particles with an average diameter of 0.3 to 0.7 μm were prepared by the controlled cohydrolysis of mixtures of titanium alkoxide and either niobium or tantalum alkoxide. An inorganic salt precipitation technique was used to put Ba, Cu, or Sr onto the surface of singly doped TiO2 partic…
In Escherichia coli ML308 isocitrate dehydrogenase is partially inactivated during growth on acetate [Bennett, P.M. and Holms, W.H. (1975) J. Gen. Microbiol. 87, 37-51]. The active form of isocitrate dehydrogenase was purified to homogeneity from cells grown on glycerol. The key step in the procedure was chromatograph…
Abstract Flight characteristics were determined for samaras of seven maple species and evaluated in terms of their contribution to dispersal potential. Two components of samara flight were identified, an initial fall distance prior to entering autorotation, and the terminal velocity once in autorotation. Despite consi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtonation equilibria and charge transport in electroactive tetracyanoquinodimethane polymer filmsGyorgy Inzelt, James Q. Chambers, James F. Kinstle, and Roger W. DayCite this: J. Am. Chem. Soc. 1984, 106, 12, 3396–3401Publication Date (Print):June 1, 1984Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTotal synthesis of (.+-.)-poitediol and (.+-.)4-epipoitediolRobert C. Gadwood, Renee M. Lett, and Jane E. WissingerCite this: J. Am. Chem. Soc. 1984, 106, 13, 3869–3870Publication Date (Print):June 1, 1984Publication History Published online1 May 2002Published inissue 1 June…
An electromotive force series for redox couples was defined as a function of oxygen fugacity in a borosilicate melt at 1150°C. The resulting order of relative reduction potentials can be used to estimate the amounts of redox species in glass during processing. The electromotive force series in this melt is comparable…
The origins of the electronic levels of rare earths in the condensed phase and the influence of the glassy matrix on the position of the energy levels and factors responsible for radiative and nonradiative transitions are discussed. Examples are given of rare earth intensity parameters and nonradiative transitions in…
This paper discusses the fundamental aspects of theories describing the electromagnetic surface modes in microcorystals and their optical response. The relationships between the theories are emphasized, and three characteristics of the surface modes are summarized. Observed infrared spectra of MgO microcrystals and Ra…