Materials Literature
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The animal fatty acid synthase is a multifunctional protein with a subunit molecular weight of 260,000. We recently reported the expression and characterization of the acyl carrier protein and thioesterase domains of the chicken liver fatty acid synthase in Escherichia coli. In order to gain insight into the mechanism…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic and electrochemical characterization of nickel .beta.-oxoporphyrins: identification of nickel(III) oxidation productsPatricia A. Connick and Kathleen A. MacorCite this: Inorg. Chem. 1991, 30, 24, 4654–4663Publication Date (Print):November 1, 1991Publication His…
We study steady symmetric lamellar eutectic growth in directional solidification by an extensive analysis of the pertinent boundary integral equation. We find a discrete set of solutions that differ in their average undercoolings. As the wavelength \ensuremath{\lambda} increases, the branches coalesce by pairs to form…
The electron energy dependence of partial cross sections for dissociation of methane into CH 3 and CH 2 radicals has been reported in part I of this paper. In order to assign absolute values to these relative cross sections, two additional experiments were carried out. One was cross-section measurement for electron-im…
Five elastic constants define the stiffness of coupled phonons and phasons in icosahedral quasicrystals. Requirements of elastic stability impose constraints (inequalities) on combinations of these elastic constants. This paper derives two sets of inequalities, one against the onset of spatially uniform strains, and a…
The problem of determining the acoustic properties of dilute bubbly liquids is examined using the method of ensemble-averaged equations and pairwise interactions. The phase speed and attenuation of sound waves in the small-amplitude regime are determined as a function of frequency of sound waves including the effects…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymers derived from hexafluoroacetone: 12F-poly(ether ketone)Gordon L. Tullos, Patrick E. Cassidy, and Anne K. St. ClairCite this: Macromolecules 1991, 24, 23, 6059–6064Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue…
A full study of parity-broken states in the directional solidification of lamellar eutectics is performed within the boundary-integral formulation. Symmetric states cease to exist at a wavelength \ensuremath{\lambda}, which is approximately twice that corresponding to their minimum undercooling, whereas solutions with…
The mechanism of degradation, or IR drop, of BaTiO 3 ‐based Ni‐electrode chip capacitors has been studied, with special attention to the microstructure. Degradation occurred mainly at the center of the capacitors. Longer‐life capacitors were obtained under conditions of low oxygen partial pressure, 10 −12 atm, during…
A chaperonin has been purified from a thermophilic bacterium, Thermus thermophilus. It consists of two kinds of proteins with approximate Mr 58,000 and 10,000 and shows a 7-fold rotational symmetry from the top view and a "football"-like shape from the side view under the electron microscopic view. Its weak ATPase act…
Abstract The reactive type copolymers styrene maleic, anhydride (SMA) and styrene glycidyl methacrylate (SG) are used as in situ compatibilizers in polyblends of polystyrene (PS) and nylon 6, 6 (N66). Both copolymers can react with N66 to form copolymers as effective compatibilizers to reduce interfacial tension and i…
Surfaces of polyethylene and polyimide films were treated in NH3 and N2 plasma using ‘‘dual-frequency’’ excitation: The samples were exposed to a microwave (2.45 GHz) glow discharge, while variable radio frequency (13.56 MHz)—induced negative direct current bias voltage values were simultaneously applied. The surface…
The dynamics of carbon monoxide oxidation on Pd, Rh, and Pt foils were probed under nearly collision-free conditions using high resolution infrared chemiluminescence. Auger electron spectroscopy was used to verify the absence of impurities on the surfaces. The reactants were supplied to the surface through a free jet…
Communication: Processability, flexibility, transparency , and a lack of grain boundaries are some of the attractive properties of amorphous molecular materials. For their integration into electronics, however, it is important that the materials can form stable amorphous, glassy states with a glass‐transition temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydroxylation of polyisoprene via addition of haloacetic acids to the double bondYoung H. Kim and Ashish PandyaCite this: Macromolecules 1991, 24, 24, 6505–6511Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November…
Abstract Linear low density polyethylenes are manufactured by copolymerizing ethylene with 1‐alkenes, yielding a linear polyethylene backbone with short side chains. Due to the nature of the catalyst used in the polymerizaton, multimodal branching distributions are typically obtained. In this report, we have investiga…
LEED I(V) data comprising three non-degenerate beams have been collected at normal incidence from the cleaved (001) surface of TiO 2 . Care has been taken to minimize the effects on the I(V) data of electron beam damage to the surface. Analysis of the I(V) data has been carried out using tensor LEED theory and a searc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelting and recrystallization during mesophase transitions of a thermotropic liquid crystalline polymerJoonhyun Nam, Tomohiro Fukai, and Thein KyuCite this: Macromolecules 1991, 24, 23, 6250–6253Publication Date (Print):November 1, 1991Publication History Published online1 M…
Magnetic properties of polycrystalline thin films of chromium chalcogenide spinels, i.e., ${\mathrm{CdCr}}_{2}$${\mathrm{Se}}_{4}$ lightly doped with indium and ${\mathrm{CdCr}}_{2\mathit{x}}$${\mathrm{In}}_{2\mathrm{\ensuremath{-}}2\mathit{x}}$${\mathrm{Se}}_{4}$, are studied. The ferromagnetic- and spin-wave-resonan…
Temperature dependence of magnetocrystalline anisotropy was measured for Co-Ti-Sn substituted Ba ferrite particles, to clarify the origin of a small temperature dependence of coercivity (dHc/dT) for this material. For comparison, the same measurement was carried out for Co-Ti substituted particles which have positive…