Materials Literature
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The surfaces of cells of several species of cyanobacteria have been studied using low-temperature scanning electron microscopy (SEM), and have been shown to be covered in a layer of hydrated mucilage. This mucilage is observed in specimens of Anabaena azollae adhering to plant cells in their natural symbiotic niche (t…
Abstract Polyethyloxazoline (PEO x ) blends with several other thermoplastic polymers were examined by differential scanning calorimetry (DSC) for miscibility. Styrene/acrylonitrile (SAN) copolymers having compositions in the range of about 20–40% acrylonitrile (AN) by weight were found to be miscible with PEO x where…
Incubation of the neutral metalloendopeptidase thermolysin at pH 7.2 in the presence of EDTA and/or low concentrations of calcium ions produces fast enzyme inactivation as a result of autolysis. The 'nicked' protein is a folded species composed of three tightly associated protein fragments. Dissociation of this comple…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural characterization of the first phosphorus-centered Baker-Figgis .gamma.-dodecametalate: .gamma.-Cs5[PV2W10O40].cntdot.xH2OP. J. Domaille and R. L. HarlowCite this: J. Am. Chem. Soc. 1986, 108, 8, 2108–2109Publication Date (Print):April 1, 1986Publicat…
A new tool to analyze the hot electron problems at the product level is introduced. The method combines the latest night vision technology and computer image processing techniques to precisely locate the transistors most vulnerable to hot electron degradation. A dual microchannel intensifier is coupled to a solid stat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and crystal structure of a hexaaza macrocyclic complex of lutetium(III)G. Bombieri, Franco Benetollo, A. Polo, L. De Cola, D. L. Smailes, and L. M. VallarinoCite this: Inorg. Chem. 1986, 25, 8, 1127–1132Publication Date (Print):April 1, 1986Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Diels-Alder reactions of protoporphyrin IX dimethyl ester with electron-deficient alkynesVeronica Scherrer Pangka, Alan R. Morgan, and David DolphinCite this: J. Org. Chem. 1986, 51, 7, 1094–1100Publication Date (Print):April 1, 1986Publication History Published online1…
Abstract Alternating mica-like and smectite-like layers of rectorite give rise to periodically varying contrast in 10-Å lattice fringes, yielding a periodicity of 20 Å in a transmission electron microscopic study. Expansion of rectorite using dodecylamine hydrochloride yields a three-layer repeat of thickness 32–35 Å,…
The cores of the individual superpartials which comprise a [10l] screw superdislocation dissociated on the (111) and (010) planes in L12 ordered materials have been investigated using computer simulation techniques for the case where antiphase boundaries (APBs) on (111) planes are unstable. The superdislocation dissoc…
SUMMARY. 1. Changes in species composition of the periphyton on introduced substrates were determined in an oligotrophic mountain stream subject to long‐term heavy metal contamination. 2. At the upstream control site, the numerically most abundant taxa were Bacillarioph yta i( Achnanlhes minutissima, Achnanthes microc…
Abstract High-resolution transmission electron microscopy (HRTEM) has been used to examine illite/smectite from the Mancos Shale; rectorite from Garland County, Arkansas; illite from Silver Hill, Montana; Na-smectite from Crook County, Wyoming; corrensite from Packwood, Washington; and diagenetic chlorite from the Tus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplex formation of polyethylenimine with sodium triflate and conductivity behavior of the complexesC. S. Harris, D. F. Shriver, and M. A. RatnerCite this: Macromolecules 1986, 19, 4, 987–989Publication Date (Print):April 1, 1986Publication History Published online1 May 200…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal vapor synthesis of a novel triple-decker sandwich complex: (.eta.6-mesitylene)2(.mu.-.eta.6:.eta.6-mesitylene)Cr2William M. LamannaCite this: J. Am. Chem. Soc. 1986, 108, 8, 2096–2097Publication Date (Print):April 1, 1986Publication History Published online1 May 2002Pu…
Growth of the nonsulfate-reducing marine bacterium Vibrio natriegens increased the corrosion current density (CD) of AISI 304 stainless steel (SS) coupons when grown in a marine medium. The corrosion rate, estimated as the corrosion CD (Icorr), calculated from the Tafel constants and polarization resistance, increased…
Microlite, rangrng from crystalline to metamict, is a principal accessory in several lithologic units of the Harding pegmatite, Taos County, New Mexico. From the sequence of lithologic units within the pegmatite, crystallization of microlite from the pegmatite magma is inferred to have begun relatively late, after the…
A preliminary investigation, using 29Si magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR), of the effect of water content on the spinlattice relaxation time, T 1, and Si‒O‒Si bond-angle distribution of vitreous silica is reported. The decrease in T 1 with increase in water content suggests that wa…
Systematic investigations of the temperature dependences of the d.c. and microwave conductivity of polyacetylene doped with various species are reported. These results are discussed within a model where the measured quantities are a superposition of different conduction mechanisms. At low dopant concentrations carrier…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of silaneMark S. Gordon, David R. Gano, J. Stephen. Binkley, and Michael J. FrischCite this: J. Am. Chem. Soc. 1986, 108, 9, 2191–2195Publication Date (Print):April 1, 1986Publication History Published online1 May 2002Published inissue 1 April 1986https…
An alignment method for materials with cholesteric to smectic C* phase transitions is described. Ordering of the molecules, confined between glass plates which have been coated with a polymer and buffed, is achieved using an electric field. While the buffing direction defines the orientation of the long axis of the mo…
Selection of steady needle crystals in the full nonlocal symmetric model of dendritic growth is considered. The diffusion equation and associated kinematic and thermodynamic boundary conditions are recast into a nonlinear integral equation which is solved numerically. For the range of P\'eclet numbers and capillarity…