Materials Literature
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Dicalcium silicates having CaO/SiO 2 molar ratios of 1.8 to 2.2 were sintered at 1450°C for 90 min with or without small quantities of dopants (K 2 O or Al 2 O 3 ) and were air quenched. The microstructures of the fired samples were characterized using electron microscopy (SEM and TEM) and associated microanalytical t…
Information on molecular interactions that give rise to the stabilization of various ferroelectric, liquid-crystalline mesophases is important to the realization of their potential utility in a wide variety of optical devices. Understanding the roles that optical activity and optical purity play in the formation and p…
In order to study the microdynamics of translational and orientational motion of ions in liquid electrolytes, a molecular dynamics simulation of molten LiNO3, which includes all degrees of freedom of vibrating nitrate ions, has been performed. Simple Coulomb pair potentials with Born-type repulsions have been adopted…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescence from the 11Bu state of diphenylhexatriene: inversion of the 11Bu and 21Ag levels in carbon disulfideBryan E. Kohler and Takao ItohCite this: J. Phys. Chem. 1988, 92, 18, 5120–5122Publication Date (Print):September 1, 1988Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic excitation MO assignment of rhodium carboxylato complexes, Rh2(O2CR)4(Lax)2, using MCD experiment and theoryJack W. Trexler Jr., Anton F. Schreiner, and F. Albert CottonCite this: Inorg. Chem. 1988, 27, 19, 3265–3267Publication Date (Print):September 1, 1988Public…
Abstract Melt‐mixed blends of polycarbonate/phenoxy were obtained before and after Interchange reactions by controlling the processing time. The dynamic mechanical analysis of the physical and reacted blends confirmed the immiscibility of the pair and the displacement of the glass‐transition temperatures of the mixtur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBrianthein V, a New Cytotoxic and Antiviral Diterpene Isolated from Briareum asbestinumStephen J. Coval, Sue Cross, Gerald Bernardinelli, and Charles W. JeffordCite this: J. Nat. Prod. 1988, 51, 5, 981–984Publication Date (Print):September 1, 1988Publication History Publishe…
Abstract Potassium‐Ca and Na‐Ca exchange isotherms were obtained for two kaolinite samples and two kaolinitic soils (Hutton and Avalon forms). The Gapon, Vanselow, and Gaines‐Thomas corrected selectivity coefficients were usually greater for K‐Ca exchange than for Na‐Ca exchange, as was expected. The exchange isotherm…
Four patients with intracranial aneurysm clips made from a variety of alloys were studied without incidence by MR imaging at field strengths ranging from 0.35 to 0.6 T. Knowledge of the type of alloy used in the manufacturing of an aneurysm clip is important in determining whether the clip will or will not deflect in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and x-ray structural characterization of binuclear iridium(I) and rhodium(I) hydroxypyridinate complexes. 1. Complete assignment of the proton NMR spectra by two dimensional and NOE techniques. The nature of inside and outside proton chemical shift differencesGary…
An intravenous injection of 153Gd-labeled gadolinium-DTPA or gadolinium chloride was given to 60 rats, which were killed either 15, 40, 120, 300, 900, or 3600 seconds later. Tissue concentrations of gadolinium in the blood, liver, spleen, stomach, pancreas, renal cortex, renal medulla, lungs, heart, adrenals, gluteal…
In part I of this study, extensive evidence for glide on the non-compact plane (001) was obtained in [112] aluminium single crystals under creep conditions at high temperatures. In this part II the same single crystals are used to measure the critical resolved shear stress for (001) glide as a function of strain rate…
The pH dependence of the kinetic parameters and primary deuterium isotope effects have been determined for tyrosine phenol-lyase from both Erwinia herbicola and Citrobacter freundii. The primary deuterium isotope effects indicate that proton abstraction from the 2-position of the substrate is partially rate-limiting f…
Research Article| September 01 1988 Structural studies of proteins by high-flux X-ray and neutron solution scattering S J Perkins S J Perkins Department of Biochemistry and Chemistry, Royal Free Hospital School of Medicine, Rowland Hill Street, London NW3 2PF, U.K. Search for other works by this author on: This Site P…
In a study of soils from a chronosequence in southern New Mexico, where CaCO3 accumulation is primarily derived from aeolian input, P adsorption was greatest in the most highly calcic horizons and least in horizons of clay and oxyhydroxide accumulation. Similarly, adsorption capacity was most highly correlated with Ca…
Abstract Coarse clay fractions (2–0.2 µm) of selected soil samples containing variable quantities (10–52%) of Al‐hydroxyinterlayered smectite (HISM) or vermiculite (HIV) were investigated by XRD, thermal, elemental and solution composition analyses. The HISM vs. HIV nature of the sample was determined from the smectit…
A study of the distribution of the debris formed by the XeCl laser ablation of polyimide and polyethylene terephthalate and the KrCl laser ablation of polyimide shows that it is the redeposition of debris rather than impurities which accounts for the cone structures commonly seen in the surface morphology.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and charge-transport properties of polymers derived from the oxidation of 1-hydro-1'-(6-(pyrrol-1-yl)hexyl)-4,4'-bipyridinium bis(hexafluorophosphate) and demonstration of a pH-sensitive microelectrochemical transistor derived from the redox properties of a convent…
Tweedle MF, Eaton SM, Eckelman WC, Gaughan GT, Hagan JJ, Wedeking PW, Yost FJ. Comparative chemical structure and pharmacokinetics of MRI contrast agents. Invest Radiol 1988; 23(Suppl 1):S236-S239. The blood clearance kinetics of five gadolinium complexes, Gd(L), were determined in rats and the results interpreted in…
Pharmacokinetic and acute-toxicity studies of Gd-DOTA meglumine (Mgl) were evaluated in various animals and compared with those of Gd-DTPA Mgl. The agents were injected intravenously at two dosages: 0.1 or 0.5 mmol/kg. Various organs and tissues were removed at specified times after injection and assayed for gadoliniu…