Materials Literature
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Small diameter (< 6 mm) synthetic vascular grafts fail at a clinically unacceptable rate due in large part to their inherent thrombogenicity. The development of a new cellular lining on synthetic vascular grafts would most likely improve the patency rates observed for these grafts in small diameter positions. We have…
Lactobacillus plantarum is a lactic acid bacterium that converts pyruvate to L-(+)- and D-(-)-lactate with stereospecific enzymes designated L-(+)- and D-(-)-lactate dehydrogenase (LDH), respectively. A gene (designated ldhL) that encodes L-(+)-lactate dehydrogenase from L. plantarum DG301 was cloned by complementatio…
Abstract In situ measurement of the creep compliance of poly(methyl methacrylate) (PMMA) and poly(ethyl methacrylate) (PEMA), equilibrated with a pressurized CO 2 phase, is used to determine the glass transition temperature. Corrections due to dilation of the polymer by CO 2 as well as the buoyancy are assessed. Both…
The Pechini process was used to produce high‐purity, monocalcium aluminate (CaAl 2 O 4 ) powders at temperatures as low as 900°C. Absorption spectrometry and BET measurements revealed particles with sizes ranging from submicrometer to 100 μm, with specific surface areas as high as 10 m 2 /g. Auger electron spectrometr…
Synechococcus strain GL24 is a unicellular cyanobacterium that was isolated from Fayetteville Green Lake, New York, a meromictic lake which has high Ca and SO(4) concentrations. Epicellular mineralization of Synechococcus cells in the lake is the mechanism by which extensive calcitic bioherms (or microbial reefs) have…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Characterization of Nanocomposites of Polyethers and Molybdenum DisulfideJohn P. Lemmon and Michael M. LernerCite this: Chem. Mater. 1994, 6, 2, 207–210Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation and X-ray Crystal Structure of a New Octamolybdate: [(RhCp*)2(.mu.2-SCH3)3]4[Mo8O26].cntdot.2CH3CN (Cp* = .eta.5-C5Me5)Rimo Xi, Bateer Wang, Kiyoshi Isobe, Takanori Nishioka, Koshiro Toriumi, and Yoshiki OzawaCite this: Inorg. Chem. 1994, 33, 4, 833–836Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced Coagulation of Au NanocolloidsNaoki Satoh, Hiroyuki Hasegawa, Kaoru Tsujii, and Keisaku KimuraCite this: J. Phys. Chem. 1994, 98, 8, 2143–2147Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994…
Atomistic simulation methods are used to predict the preferred solution mechanisms and their associated energies. Both full‐ and partial‐charge models are discussed. It was found that defect clustering always results in a significant lowering of the solution energies but does not change the preferred solution reaction…
Films of several polyimides having various chain rigidities were prepared on silicon substrates from the poly(amic acid) precursors by a conventional spin-coat/dry/thermal imidization process: poly(p-phenylene pyromellitimide) (PMDA-PDA), poly(4,4′-oxydiphenylene pyromellitimide) (PMDA-ODA), poly(p-phenylene biphenylt…
To improve the hemocompatibility on hydrophobic biomedical materials by a simple coating technique, graft copolymers composed of a hydrophilic side chain with phospholipid polar groups and a hydrophobic backbone were synthesized. The hydrophilic chain had phospholipid polar groups, poly[2-methacryloyloxyethyl phosphor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of a Synthesis of meso-Porphyrins Employing High Concentration Conditions and an Electron Transport Chain for Aerobic OxidationJonathan S. Lindsey, Kristy A. MacCrum, John S. Tyhonas, and Yao Yuan ChuangCite this: J. Org. Chem. 1994, 59, 3, 579–587Publication D…
In this paper we study an organic system of geometrical spin frustration. m-N-methylpyridinium \ensuremath{\alpha}-nitronyl nitroxide (m-${\mathrm{MPYNN}}^{+}$) is a spin-1/2 organic radical. The simple salt, m-${\mathrm{MPYNN}}^{+}$\ensuremath{\cdot}${\mathrm{ClO}}_{4}^{\mathrm{\ensuremath{-}}}$\ensuremath{\cdot}1/3…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic nickel(II) polynuclear complexes with end-on azido as bridging ligand. The first nickel(II)-azido one-dimensional ferromagnetic systemsJoan Ribas, Montserrat Monfort, Carmen Diaz, Carles Bastos, and Xavier SolansCite this: Inorg. Chem. 1994, 33, 3, 484–489Publi…
A method is presented for the deposition of CdS thin films of 0.05–0.7 μm thickness from solutions at 50–70 °C containing citratocadmium(II) complex ions and thiourea. The films show an optical band gap Eg≳2.6 eV. Optical transmittance is about 80% for photon energy &lt;Eg. The dark conductivity of the films is of…
The interactions between the phthalocyanine macrocycle Pc2- and the metal ions Co2+, Ni2+ and Cu2+ are analyzed\nin detail. It is concluded that u bonding is by far dominant, mostly due to strong charge donation from the pyrrolic\nnitrogen lone pairs into the empty or singly occupied (in Cu) 3d,, with additional effec…
Color tuning of luminescence via molecular engineering of the active polymer is important for the commercial application of π‐conjugated polymers in photonic devices. The synthesis of a series of regiospecific alkylated polythiophenes is described, in which the effective conjugation length could be varied by altering…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix isolation FT-IR studies and ab initio calculations of hydrogen-bonded complexes of molecules modeling cytosine or isocytosine tautomers. 1. Pyridine and pyrimidine complexes with water in argon matrixesAlain Destexhe, Johan Smets, Ludwik Adamowicz, and Guido MaesCite…
The electronic structure, the linear optical properties, and the structural properties of α‐Al 2 O 3 in the corundum structure are studied by means of first‐principles local density calculations. An indirect band gap of 6.29 eV is obtained, which is almost the same as the direct band gap of 6.31 eV at Γ. The calculate…
Microwave discharges (2.45 GHz) have been generated in C60-containing Ar. The gas mixtures were produced by flowing Ar over fullerene-containing soot at a variety of temperatures. Optical spectroscopy shows that the spectrum is dominated by the d 3Πg–a 3Πu Swan bands of C2 and particularly the Δv=−2, −1, 0, +1, and +2…