Materials Literature
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The metabolites of the Canadian tuckahoe, the sclerotium of Polyporus tuberaster, have been investigated. The ten-membered lactone tuckolide [1] was isolated, and its structure was determined by spectroscopic methods and confirmed by X-ray crystallography. Ergosterol, ergosterol peroxide, and several unidentified ergo…
The formula of the title compound is no printing error! Instead it announces unusual chemistry. This oxide is subvalent with respect to silver and contains an extremely electron-poor Ag cluster. It therefore seems almost paradoxical that the yellowish shiny metallic oxide is formed under elevated oxygen pressure, that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and NMR spectroscopy of metallocenium ions. Support for a new ferromagnetic coupling mechanism in decamethylmetallocenium tetracyanoethenidesJanet Bluemel, Nikolaus Hebendanz, Peter Hudeczek, Frank H. Koehler, and Werner StraussCite this: J. Am. Chem. Soc. 1992, 11…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conductive metal sulfide-polymer composites prepared by using organosols of metal sulfidesTakakazu Yamamoto, Etsuo Kubota, Atsushi Taniguchi, Somanath Dev, Kuniaki Tanaka, Kohtaro Osakada, and Masao SumitaCite this: Chem. Mater. 1992, 4, 3, 570–576Publication Da…
Fine structural determinations are utilized to illustrate the advantage of the use of mixed oxides as starting materials rather than mixtures of separated oxides, with respect to the expected performance of yttrium‐europium oxide red phosphor for lamps. X‐ray synchrotron diffraction experiments show how improved homog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy study of bulk and colloidal polyanilineM. Aldissi and S. P. ArmesCite this: Macromolecules 1992, 25, 11, 2963–2968Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://pubs.acs.o…
Molecular-dynamics simulations of several water-crystalline urea interfaces have been performed. The structure and dynamics of water close to the urea crystal surface are discussed in terms of density profiles, positional and orientational distribution functions, and diffusion coefficients. The water structure close t…
The thermal conductivity of heavily doped, n-type Si-Ge alloys has been studied from 300 to 1200 K. The scattering rate of several phonon scattering mechanisms has been calculated, including intrinsic scattering, mass defect and distortion scattering, phonon-electron scattering, and scattering by inclusions. These rat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe mechanism of the desulfurization of benzenethiol by nickel (110)D. R. HuntleyCite this: J. Phys. Chem. 1992, 96, 11, 4550–4558Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://doi.org/10.1021/j100190a077…
Abstract X‐ray photoelectron spectroscopy (XPS) has been applied to the study of the oxidation state variations of Cr ions in the chromia/zirconia system (CrO x /ZrO 2 ) submitted to redox cycles: O 2 at 773 K (standard oxidation), CO at 673 K (standard reduction) and H 2 O after standard reduction at 743 K. The XPS r…
This paper presents a modification of the block Householder method based on the compact WY representation [R. Schreiber and C. Van Loan, SIAM J. Sci. Statist. Comput., 10 (1989), pp. 52–57]. It is modified in order to introduce more matrix–matrix operations.
The beta-glucosidase encoded by the bglA gene from Bacillus polymyxa was overproduced in Escherichia coli by using a plasmid in which bglA is under control of the lacI promoter. Induction with isopropyl-beta-D-thiogalactopyranoside allowed an increase in the specific activity of the enzyme of about 100 times the basal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHIV inhibitory natural products. 6. The peltatols, novel HIV-inhibitory catechol derivatives from Pothomorphe peltataKirk R. Gustafson, John H. Cardellina II, James B. McMahon, Lewis K. Pannell, Gordon M. Cragg, and Michael R. BoydCite this: J. Org. Chem. 1992, 57, 10, 2809–…
Nonstoichiometric, anhydrous thin films were produced by sputtering. They can be bleached by means of hydrogen insertion equally fast and efficiently either in an electrochemical cell or in a gas chamber, as demonstrated in this work by using a Pd covered thin film electrode. The electrode mechanical stress and transm…
The adsorption mode of two highly purified cellulases, exo- and endo-type cellulases, from Irpex lacteus (Polyporus tulipiferae) was investigated by using pure cellulosic materials with different crystallinity as substrates. Adsorption of the two enzymes on the substrates was found to fit the Langmuir-type adsorption…
Using ac conductivity and the concentration cell emf method, conductivity contributions from protons, native ions, and electrons have been measured as a function of temperature (560° to 1156°C) in wet oxygen/air for the cubic systems Y 2 O 3 + 1 mol% MgO, Sm 2 O 3 + 1 mol% CaO, Gd 2 O 3 + 1 mol% CaO, and YYbO 3 + 5 mo…
The kraft pulp and paper industry is currently faced with the challenge of substantially reducing the discharge of conventional and toxic pollutants to the receiving environment without compromising its competitiveness. Ultrafiltration (UF) and nanofiltration (NF) are among the various unit processes that are being in…
Hybrid refractive-diffractive elements offer a similar level of aberration control to the conventional doublet with approximately half the volume of material. The design principles of infrared elements are discussed. It is shown that, in order to match the performance of the conventional doublet, a general meniscus hy…
The sintering sequence of Y 2 O 3 ‐Al 2 O 3 ‐doped Si 3 N 4 was investigated with respect to the relationship between densification, α→β transformation, and microstructural development. Quenching studies were performed to reveal these interactions during a complete sintering cycle. Isothermal studies were conducted to…
A pure, acicular lead titanate (PbTiO 3 ) fine powder with a white color has been prepared by hydrothermal synthesis. It is a new phase of PbTiO 3 with I 4 symmetry, cell parameters of a = 12.358 Å and b = 14.541 Å, and a density of 6.80 g.cm −3 . The influences of pH (12.5 to 14.4), Pb/Ti ratio (1.0 to 1.6) in the fe…