Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structures of 2,11-dithia- and 1,3,10,12-tetrathia[3.3](2,6)-pyridinophanesGeorge R. Newkome, Sebastiano Pappalardo, and Frank R. FronczekCite this: J. Am. Chem. Soc. 1983, 105, 15, 5152–5153Publication Date (Print):July 1, 1983Publication History Publi…
Abstract Blepharida sacra (Weise) is one of many species of flea beetles that have remarkable jumping abilities. The energy for its prodigious leaps is evidently stored in a central scroll‐shaped organ inside the hind femur of this insect—the metafemoral spring. X‐ray diffraction, scanning electron microscope, and ana…
Summary On-going field scaling tests have provided a unique opportunity to study how strontium sulfate and calcium sulfate scales are formed in an oil-producing well. Results indicate that development of nucleation sites on tubing surfaces is the most critical step. Scale profiles within a wellbore are determined main…
Glycolysis of rigid polyurethane foams is an efficient process for chemical recycling of waste products into raw materials. Secondary reactions leading, to some extent, to formation of amines are also involved in the process. The choice of catalyst is an important factor in selecting the type of reaction as well as th…
A new Monte Carlo simulation including generation of secondary electrons has been performed to study ultimate resolution in electron beam lithography. With respect to the simulations of inelastic scattering process of the primary electrons we used Gryzinski’s excitation function for single electron excitation processe…
We found that silver, either as silver metal or silver chloride, exerted toxic effects on the smooth muscle of isolated cannulated hamster cheek pouch arterioles. Silver initially stimulated the smooth muscle, producing a marked vasoconstriction. The vessels then dilated back to control diameters. Once the arterioles…
In the Staphylococcus aureus strain harbouring the plasmid RPAL, the resistance to aminoglycoside antibiotics results from two inactivating reactions catalyzed by a 6'-N-aminoglycoside acetyltransferase and a 2"-O-amino-glycoside phosphotransferase. These enzymes are copurified with a constant ratio between the two ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSwelling of model poly(dimethylsiloxane) networksR. W. Brotzman Jr. and B. E. EichingerCite this: Macromolecules 1983, 16, 7, 1131–1136Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 1983https://pubs.acs.org/doi/10.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPotential dependence of surface-enhanced Raman scattering from citrate on colloidal silverC. G. Blatchford, O. Siiman, and Milton KerkerCite this: J. Phys. Chem. 1983, 87, 14, 2503–2508Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Publish…
Abstract The resistance and resistivity of Ketjenblack EC/silicone rubber compounds were studied as function of strain in constant strain rate experiments. Both strain and rate of strain affect the electrical resistivity of the compounds. Such effects are carbon black concentration dependent. Ketjenblack EC, a low str…
Films selected for anticipated reaction with atomic oxygen, namely carbon, silver, and osmium, were exposed during the Shuttle STS‐4 mission. A silver film 225 ± 5 nm thick was converted to a transparent blue‐green interference film 355 ± 5 nm thick. Both carbon and osmium films 10‐30 nm thick apparently formed volati…
In an effort to advance our understanding of the principles governing the structures of and the hydrogen bonding in alkylammonium hexachlorostannates(IV), (R n NH 4−n ) 2 SnCl 6 , we have determined the room-temperature crystal structures of (Me 2 NH 2 ) 2 SnCl 6 and (Me 3 NH) 2 SnCl 6 (variants of the antifluorite st…
Abstract Treatment of ketones with bis(trimethylsilyl) peroxide and Lewis acid such as SnCl4 or BF3·OEt2 in dichloromcthane at room temperature affords esters in fair to excellent yields. Jasmine lactone is synthesized from 2-[(Z)-2-pentenyl]cyclopentanone by means of Me3SiOOSiMe3–BF3·OEt2 system without any protectio…
Abstract Montmorillonite has a heterogeneous charge distribution, and it is important to determine whether constant potential edge sites or constant charge sites control metal adsorption. The pH dependence of metal adsorption provides insight into the adsorption mechanism as well as being an important variable that wi…
The thermal and electrical conductivities, fracture strength, swelling, and microstructure of sintered alpha‐phase Sic and siliconized reaction‐bonded Sic materials were studied before and after irradiation with reactor neutrons. The effects of helium gas on the properties were studied using boron enriched in ' O B to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDynamic mechanical properties of polystyrene containing microspherical inclusions of polybutadiene: influence of domain boundaries and rubber molecular weightFrank S. Bates, Robert E. Cohen, and A. S. ArgonCite this: Macromolecules 1983, 16, 7, 1108–1114Publication Date (Pri…
THE TWENTY-TWO known cases of congenital goiter, with or without cretinism, that are due to defective iodide concentrating ability have been compared. The defect may be total or partial, sometimes becomes clinically manifest long after the neonatal period, shows male predominance, and frequently occurs without evidenc…
The nylon oligomer (6-aminohexanoic acid cyclic dimer) degradation genes on plasmid pOAD2 of Flavobacterium sp. KI72 were cloned into Escherichia coli vector pBR322. The locus of one of the genes, the structural gene of 6-aminohexanoic acid linear oligomer hydrolase, was determined by constructing various deletion pla…
Abstract Porous solids have been simulated in the computer as assemblages of spheres. When such assemblages contain spheres distributed in size and randomly arranged in space, the structure of the resulting solid resembles that of a real porous solid. Monte Carlo calculations of gas molecule trajectories through the a…
Abstract A comprehensive review of the journal literature dealing with short-fiber reinforcement of various types of elastomers over the past decade indicates an underutilization of the potential for this type of reinforcing agent within the rubber industry. Whereas the properties of continuous cords are not necessari…