Materials Literature
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The first polyhydroxyalkanoic acid (PHA) synthase gene (phbCRr) of a Gram-positive bacterium was cloned from a genomic library of Rhodococcus ruber in the broad-host-range plasmid vector pRK404. The hybrid plasmid harboring phbCRr allowed the expression of polyhydroxybutyric acid (PHB) synthase activity and restored t…
Abstract The development of integrated soil fertility programs will involve the consideration of mineralogical and taxonomical classifications of soils. The objective of this work was to investigate K and Mg release from silt and clay fractions of four Québec soils. All soils were characterized by a mixed clay mineral…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of poly(ethylene ether carbonate) diols: proposed mechanism and kinetic analysisRobson F. Storey and Douglas C. HoffmanCite this: Macromolecules 1992, 25, 20, 5369–5382Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published…
Fine‐grained β‐Ca 2 SiO 4 containing small amounts of sodium was fabricated as an analogue to tetragonal zirconia polycrystals (TZP) in order to study the stress‐induced β→γ transformation. This avoided the problems associated with the fabrication and evaluation of composites containing β‐Ca 2 SiO 4 . The microstructu…
The spin-lattice relaxation time ${\mathrm{\ensuremath{\tau}}}_{\mathit{s}\mathit{l}}$ is the characteristic time needed for the energy transfer between the lattice and the spin system. It is demonstrated that ${\mathrm{\ensuremath{\tau}}}_{\mathit{s}\mathit{l}}$ can be determined with laser-induced spin-polarized pho…
Transparent lead lanthanum zirconate titanate (PLZT) ceramics were fabricated from fine powders using an inexpensive two‐stage sintering technique. The powders were prepared by hydrolysis from low‐cost inorganic precursors. In the two‐stage sintering method, uniaxially pressed green pellets were densified to nearly th…
A model of magnetoelasticity based on the differential susceptibility, stress effective magnetic field, and stress demagnetization in conjunction with appropriate rules of hysteresis is presented and compared to experimental data for high-strength steels for several magnetoelastic processes. The authors observe a decr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of a bidisperse polymer brush: Monte Carlo simulation and self-consistent field resultsPik Yin Lai and E. B. ZhulinaCite this: Macromolecules 1992, 25, 20, 5201–5207Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDelocalization mechanism of ferromagnetic exchange interactions in complexes of copper(II) with nitroxyl radicalsR. N. Musin, P. V. Schastnev, and S. A. MalinovskayaCite this: Inorg. Chem. 1992, 31, 20, 4118–4121Publication Date (Print):September 1, 1992Publication History P…
Various spectra of Raman for different grain sizes of diamond powder have been studied. The spectra are also correlated to the results of transmission electron diffraction, transmission electron microscopy, scanning electron microscopy, and x-ray photoelectron spectroscopy. When the Raman peak intensity was decreased,…
A Bi 2 O 3 -TiO 2 phase diagram was determined using differential thermal analysis (DTA) apparatus. Bi 4 Ti 3 O 12 (BIT) micalike single crystals grown by a flux method were clear and slightly grayish in color. Ferroelectric and dielectric properties of BIT crystals were observed from measurements of electric displace…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParticle size distributions of polyaniline-silica colloidal compositesM. Gill, S. P. Armes, D. Fairhurst, S. N. Emmett, G. Idzorek, and T. PigottCite this: Langmuir 1992, 8, 9, 2178–2182Publication Date (Print):September 1, 1992Publication History Published online1 May 2002P…
Ab initio and semiempirical molecular orbital methods have been used to calculate the bulk and surface Raman and hyperRaman spectra of pyridine. Similar calculations for benzene are also reported. For both molecules, we compare the results with available bulk and surface experiments. In all calculations, the polarizab…
The function of a highly mobile loop in Escherichia coli dihydrofolate reductase was studied by constructing a mutant (DL1) using cassette mutagenesis that had four residues deleted in the middle section of the loop (Met16-Ala19) and a glycine inserted to seal the gap. This part of the loop involves residues 16-20 and…
The anodic dissolution of silicon in fluoride media has been investigated by impedance measurements. In nonresonant conditions, behavior typical of metal corrosion is observed: at low positive potentials, up to a first current maximum (regime of porous silicon generation), the main feature of the impedance is an induc…
Experiments on hydrothermal synthesis were conducted using quartz or silicic acid and lime as starting materials at Ca/Si = 2.0. It is possible to synthesize pure hillebrandite (Ca 2 (SiO 3 )(OH) 2 ) having the theoretical composition by heating at 200°C for 10 h or at 250°C for 5 h. The synthesized product is fibrous…
Detailed transmission electron microscopy (TEM) studies have been carried out in order to examine the role of annealing twin boundaries in the cyclic deformation of ramp-loaded polycrystalline copper. It is found that regions adjacent to the twins are preferred sites for earlier formation of persistent slip bands (PSB…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal and thermooxidative degradation of poly(ethylene oxide)-metal salt complexesLuigi Costa, Ali M. Gad, Giovanni Camino, G. Gordon Cameron, and M. Younus QureshiCite this: Macromolecules 1992, 25, 20, 5512–5518Publication Date (Print):September 1, 1992Publication Histor…
Abstract The adsorption isotherms of O 2 , N 2 , CH 4 , CO 2 , SO 2 , and NO on five pillared clays (Zr, Al, Cr, Fe, and Ti‐PILCs) are measured. The equilibrium selectivity of CH 4 /N 2 on Al‐PILC is greater than 5.0, which exceeds all known sorbents by a large margin. In addition, high SO 2 /CO 2 equilibrium selectiv…
Three different diameters (0.50, 1, and 2 μm) of monosized spherical pores were introduced, at different volume percents up to 15%, into two submicrometer commercial Zr(Y)O 2 powders which exhibited either sluggish (ZrO 2 –3 mol% Y 2 O 3 ) or rapid (ZrO 2 –8 mol% Y 2 O 3 ) grain growth kinetics. Densification and grai…