Materials Literature
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Francolites, carbonate fluorapatites, occur in temporally and spa- tially related sedimentary phosphorite deposits that range in age from the Proterozoic to the Neogene. Previous mineralogical studies of francolites have established that systematic relationships exist between chemical composition and crystdlographic d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect polyiodination of benzenesulfonic acidDaniell Lewis Mattern and Xinhua ChenCite this: J. Org. Chem. 1991, 56, 20, 5903–5907Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September 1991https://pubs.acs.org/do…
An application of diffuse reflectance infrared Fourier transform (DRIFT) spectrometry to determine powdery sample with an unknown particle size has been proposed. The usefulness of this technique has been demonstrated for the analysis of the α-component in Si 3 N 4 powders. The particle size of the α-component in Si 3…
Abstract Five- and six-coordinated nitrosyl iron(II) complexes of a series of tetrakis(p-substituted phenyl)porphyrins have been prepared. Their EPR and IR spectra have been measured and analyzed in order to elucidate the cis-effect of substituents on the axial nitrosyl ligand. As the first redox potentials of the fre…
We have isolated a cDNA clone for a P-450, designated P-450ib (Ichihara, K., Kusunose, E., Kaku, M., Yamamoto, S., and Kusunose, M. (1985) Biochim. Biophys. Acta 831, 99-105), from a cDNA library of rabbit small intestine mucosa by using synthetic DNA fragment by the polymerase chain reaction, as a hybridization probe…
Polycrystalline AIN bodies were made with a range of porosities from various AIN powders by sintering or hot‐pressing. Thermal conductivity data for material produced without sintering aids showed a gradual, yet definite, porosity dependence with scatter similar to other property‐porosity studies. The thermal conducti…
PbTiO 3 thin films have been deposited on Si or Pt substrates by the laser ablation method. The ArF excimer laser (193 nm) and YAG laser (1064 nm) were used. Systematic investigations on the film deposition rates with its spacial distributions as functions of laser fluence have been made. As a result, it is suggested…
Abstract Polyaniline in the reduced form , leucoemeraldine base form) undergoes oxidation by radical generating reagents such as O2, H2O2–FeCl3, catalyst system, and dibenzoyl peroxide to give the 50% oxidized polymer , emeraldine base form). The oxidation by the H2O2–FeCl3 system shows kinetic behaviors characteristi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-order optical nonlinearities of model compounds containing benzobisthiazole, benzobisoxazole, and benzbisimidazole unitsBruce A. Reinhardt, Marilyn R. Unroe, Robert C. Evers, Mingtang Zhao, Marek Samoc, Paras N. Prasad, and Mark SinskyCite this: Chem. Mater. 1991, 3, 5…
Abstract The sequential development of kaolin by progressive alteration of smectite, involving kaolin-smectite interstratifications as a genetic link is described from a red and black complex. Mineral compositions were studied using XRD, DTA and XRF techniques. The basalt-derived soils are situated along a 600 m trans…
SUMMARY Retention of ethylene glycol monoethylether (EGME) and ethylene glycol (EG), and sorption of nitrogen and water vapour, were studied on a wide range of soils from New Zealand and Fiji. EGME retention was mainly affected by the amount of EGME liquid present in the desiccator, the interaction with the desiccant…
The convex peg potential has been incorporated into a van der Waals theory of the (uniaxial) nematic to isotropic liquid crystal transition. In the convex peg model, molecules are envisioned to have a hard (here biaxial) core embedded in a spherically symmetric square well. Anisotropies in the potential are derived fr…
Abstract Die Oxidation von DyCl 2 mit Schwefel in Gegenwart von NaCl (Tantal‐Kapsel, 800°C, 7 d) liefert Einkristalle von Dy 2 S 3 im U 2 S 3 ‐Typ als Hauptprodukt. Oxidische Verunreinigungen (z. B. DyOCl) werden dabei zu Dy 2 OS 2 umgesetzt, das in zwei verschiedenen einkristallinen Formen anfällt: fast farblose Nade…
Multi‐Step Redox Systems, LV. – Crystal Structure of the CT Complex 2,5‐Me 2 ‐DCNQI/TTF from N,N′‐Dicyano‐2,5‐dimethyl‐1,4 ‐benzoquinone Diimine and Tetrathiafulvalene and of the Acceptor 2,5‐Me 2 ‐DCNQI The crystal structure of the title compound is described and discussed in terms of a neutral non‐conducting mixed‐s…
Lithium tantalate (LiTaO 3 ) thin films were deposited on sapphire-C substrates by rf magnetron sputtering at various substrate temperatures. The crystallinity was examined by X-ray diffraction and reflection high-energy electron diffraction (RHEED), and the refractive indices were determined by the prism coupling m-l…
Bonding of Cu/Cr films to several polyimides has been studied as a function of polymer surface modification by ion beam and chemical pretreatment. The effects of the metal deposition method and parameters have also been examined. The materials of interest include a low thermal expansion polyimide derived from 3,3′,4,4…
A new time-resolved fluorescence immunoassay system involving use of the europium chelate of 4,7-bis(chlorosulfophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid as label is reviewed. This stable chelate by itself is not very fluorescent but, used in multiple labeling strategies, improves the achievable detection limi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of potassium copper telluride (K4Cu8Te11): a novel solid-state chalcogenide compound with a dodecahedral cluster as a building blockYounbong Park and Mercouri G. KanatzidisCite this: Chem. Mater. 1991, 3, 5, 781–783Publication Date (Print):Sept…
The Bacillus subtilis sacU locus consists of the degS and degU genes, which play a major role in controlling the production of degradative enzymes including extracellular proteases. DegS has been shown to be autophosphorylated and to transfer the phosphoryl group to DegU. In this study, we partially purified the DegS…
Canonical Van Vleck perturbation theory (CVPT) is used to calculate electric dipole intensities for one-, two-, and three-dimensional models of HCN and a six-dimensional model of H2CO. Lehmann and Smith [J. Chem. Phys. 93, 6140 (1990)] have shown that the intensities of overtone transitions are sensitive to the detail…