Materials Literature
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Recombinant Escherichia coli XL1-Blue harboring a high-copy-number plasmid containing the Alcaligenes eutrophus polyhydroxyalkanoate synthesis genes could efficiently synthesize poly(3-hydroxybutyrate) (PHB) in a complex medium containing yeast extract and tryptone but not in a defined medium. One of the reasons for t…
β-K 2 Bi 8 Se 13 ( I ), K 2 Sb 8 Se 13 ( II ), K 2.5 Bi 8.5 Se 14 ( III ), and K 2.5 Sb 8.5 Se 14 ( IV ) were synthesized by a molten flux method. The black needles of compound I were formed at 600 °C and crystallized in the monoclinic P 2 1 / m space group (No. 11) with a = 17.492(3) Å, b = 4.205(1) Å, c = 18.461(4)…
This work was directed at extending the use of lipase-catalyzed ring-opening polymerizations to cyclic carbonate monomers. Of the seven lipases screened for bulk trimethylene carbonate (TMC) polymerization (70 °C, 120 h), Novozym-435 from Candida antarctica gave almost quantitative monomer conversion (97%) and poly(TM…
Steady-state, CO-oxidation kinetics at 515 K have been measured on model, Pd catalysts, prepared by vapor deposition of Pd onto either zirconia, praseodymia, ceria, or a ceria-zirconia mixed oxide. A second rate process (RE2), associated with both the metal and the oxide support and observed previously on ceria-suppor…
Near-edge X-ray absorption fine structure, NEXAFS, spectroscopy was used to investigate the relaxations of polystyrene, a typical amorphous polymer, near a free surface after the imposition of a small deformation. Using synchrotron radiation, the NEXAFS dichroic ratio was determined for both the Auger and total electr…
We present in this work results from atomistic molecular dynamics simulations of a n -C 100 H 202 melt. This work represents a first effort to simulate a fully equilibrated ensemble of chains of sufficient length to follow Gaussian chains statistics and hence Rouse-like chain dynamics, employing well-validated, realis…
A method is described for the low‐temperature preparation of amorphous vanadates of general formula (R = In, Cr, Fe, Al, Y), and their electrochemical properties vs. Li are reported. A dissolution‐reprecipitation process from a mixed solution of and was used to prepare these compounds. By appropriate annealing of the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTDiscrete High Molecular Weight Triarylamine Dendrimers Prepared by Palladium-Catalyzed AminationJanis Louie, John F. Hartwig, and Albert J. FryView Author Information Department of Chemistry, Yale University P.O. Box 208107, New Haven, Connecticut 06520-8107 Department…
The dynamics of semi-flexible polymers and membranes is discussed. The effect of thermal undulations on both the transversal and longitudinal Mean Square Displacement (MSD) of a tagged “monomer” is studied in free polymers and membranes. The two MSDs are found to be proportional to one another, and behave as ∼t3/4 for…
GafChromic MD-55 is a fairly new, thin film dosimeter that develops a blue color (lambda max = 676 nm) when irradiated with ionizing radiation. The increase in absorbance is roughly proportional to the absorbed dose. In this study, GafChromic MD-55 was irradiated with 60Co gamma rays. A double irradiation method was u…
The sonoluminescence generated in water with pulsed 515 kHz ultrasound has been studied in the presence of different chain length (C 1 −C 5 ) aliphatic alcohols and the surfactants sodium dodecyl sulfate (SDS), dodecyltrimethylammonium chloride (DTAC), and N -dodecyl- N, N -dimethyl-3-ammonio-1-propanesulfonate (DAPS)…
Titanium dioxide, a large-bandgap semiconductor and versatile photocatalyst, has been grafted onto the pore surface of MCM-41 and FSM-16 (a mesoporous material derived from kanemite) by reacting TiCl 4 in hexanes with the as-synthesized mesostructured silicate. The products have been extensively characterized by powde…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTRemarkable Stabilization of Self-Assembled Organogels by PolymerizationMaaike de Loos, Jan van Esch, Iets Stokroos, Richard M. Kellogg, and Ben L. FeringaView Author Information Department of Organic and Molecular Inorganic Chemistry, University of Groningen Nijenborgh…
RATIONALE AND OBJECTIVES: The authors assess the effect of weak protein binding on the efficacy of gadolinium chelates as contrast agents for magnetic resonance imaging (MRI). METHODS: Chelates with no (gadopentetate dimeglumine), weak (gadobenate dimeglumine), and strong (B-21326/7) protein binding were compared by i…
Stable ``T junctions'' of single-walled carbon nanotubes forming one of the smallest prototypes of microscopic metal-semiconductor-metal contacts are proposed. The structures have been found to be local minima of the total energy on relaxation with a generalized tight-binding molecular dynamics scheme. These quasi-2D…