Materials Literature
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A light-harvesting fucoxanthin-chlorophyll a/c-protein complex has been isolated from the diatom Phaeodactylum tricornutum by detergent extraction of thylakoid membranes coupled with sucrose density gradient centrifugation. The isolated complex was devoid of photochemical activity and displayed spectral characteristic…
Abstract The soils on the Mall in Washington, DC have formed in about 6 m of miscellaneous fill deposited in repeated applications to the site during filling operations. Some limited pedogenesis has occurred; cambic, or cambic‐like B horizons were recognized in 26% of the profiles examined. Buried A horizons were foun…
The pseudopotential method is used to examine the structural stability of high-pressure orthorhombic, rhombohedral (A-7), and simple cubic (sc) phases of black phosphorus. The calculated ground-state properties are in good agreement with the measured values for each phase. A total-energy study gives the orthorhombic p…
Abstract A convenient method for the synthesis of poly(benzoxazole)s of high molecular weights has been developed. These polymers were prepared readily by direct polycondensation of aromatic dicarboxylic acids containing phenyl either structure with 3,3′‐dihydroxybenzidine dihydrochloride using phosphorus pentoxide/me…
The dynamics of particle interactions in porous media are studied using a newly formulated mean field theory. Statistical correlations in the gel network are analyzed in detail and found to have a crucial influence on the results. Self-diffusion and mutual diffusion coefficients of Brownian particles moving through a…
Abstract The plasticizing effect of a nonpolar and a polar diluent in ionomers was studied by dynamic mechanical methods in the glassy to rubbery regions. Specifically, a carboxylate and a sulfonate polystyrene‐based ionomer were investigated with variation of diethylbenzene content and of glycerol content. It was fou…
Abstract The crystallization behavior, via annealing, of PEEK was investigated using FTIR spectroscopy. It was found that predominantly amorphous PEEK (e.g., quenched polymer) follows two distinct mechanisms when it is annealed. One is a lower energy relaxation process that involves the partial rotation of the ether l…
Abstract Adsorption of methanol and benzene on alkylammonium montmorillonite, a hydrophobic layer silicate, changes the orientation of the alkylatnmonium ions at the internal and external surfaces. The hydrophobic chains are pushed off from the surface and assume upright orientations. The methanol molecules are adsorb…
Abstract not Available.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of monomeric thiopivalaldehydeEdwin. Vedejs, David A. Perry, and Richard G. WildeCite this: J. Am. Chem. Soc. 1986, 108, 11, 2985–2989Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May 1986https://pubs.a…
A computational methodology is presented for the problem of melting of a pure metal from an isothermal vertical wall. The governing conservation equations of mass, momentum, and energy are solved with a control volume-based discretization scheme adapted for irregular geometries. The moving boundary is immobilized by e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne- and two-electron reduction of metalloporphyrins. Radiation chemical, photochemical, and electrochemical studies. Kinetics of the decay of .pi.-radical anionsM. C. Richoux, P. Neta, Anthony Harriman, S. Baral, and P. HambrightCite this: J. Phys. Chem. 1986, 90, 11, 2462–…
The so-called ‘smectic’ D phase of 4′-n-octadecyloxy-3′-cyanobiphenyl-4-carboxylic acid (one of only four materials known to exhibit this phase) has been shown unambiguously by X-ray diffraction to be characterized by a primitive cubic space group. The space group is either P23 or Pm3, and the lattice parameter a 0 is…
Intramolecular electron transfer is investigated in the mixed-valence complex [Fe30(02CCH3)6(4-Me-py)3] (C6H6), \nwhere 4-Me-py is 4-methylpyridine. Rotational motion of the benzene solvate molecule and the possible influence of this motion \non the rate of intramolecular electron transfer are studied crystall…
Alternating layers of Si (400–500 Å thick) and Rh (200 Å thick), up to 21 layers altogether, have been deposited by electron beam evaporation under high vacuum conditions on to thermally oxidized silicon substrates at room temperature. Many of the as-deposited samples exhibit varying degrees of surface roughness. RBS…
An intermetallic compound of zirconium-cobalt was prepared, and the pressure-composition isotherms for the ZrCo-H system were measured in the pressure range from 10 Pa (0.1 Torr) to ∼130 kPa (1000 Torr) and in the temperature range from 130 to 400°C. The equilibrium hydrogen pressures of plateaus under the experimenta…
Abstract The review is concerned primarily with some aspects of mixing in continuous crystallizers and recognizes the central importance of the interplay between the mixing and crystallization (or precipitation) processes in the design and performance evaluation of industrial crystallizers. The paper adopts a unifying…
In patients with resistant malignant tumors, we performed a pilot trial of intravenous infusion of a water-insoluble cytostatic agent, NSC 251635, entrapped in large volumes of liposomes made of egg yolk lecithin, cholesterol, and stearylamine (4:3:1). Forty liposome infusions were given to 14 patients in 38 courses.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSedimentation classification of silver colloids for surface-enhanced Raman scatteringRong Sheng. Sheng, Ling. Zhu, and Michael D. MorrisCite this: Anal. Chem. 1986, 58, 6, 1116–1119Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published in…
Several freshwater species of Synedra Ehrenb. have been investigated using light and electron microscopy. The morphology of the vegetative valve and girdle region is discussed and an evaluation of the taxonomic position of Fragilaria ungeriana Grun. is made in the light of new evidence. Homologies have been identified…