Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorine-19 NMR chemical shifts and the microstructure of fluoro polymersAlan E. Tonelli, F. C. Schilling, and Rudolf E. CaisCite this: Macromolecules 1982, 15, 3, 849–853Publication Date (Print):May 1, 1982Publication History Published online1 May 2002Published inissue 1 Ma…
A study has been commenced to determine the exact nature of marine iron corrosion products. Due to differences in micro-environments and corrosion products it is necessary to consider at least four distinct stages in the history of marine iron artifacts. These stages are (1) initial immersion, (2) concreted with resid…
A statistical theory of lyotropic cholesteric phase in the system of long coiled rod molecules is presented. Effects of molecular exclusion and of attractive intermolecular force are both taken into consideration. On the basis of the theoretical results, experiments on the cholesteric solutions of polypeptide are inve…
Metrizamide was employed in six patients who, during angiography, had had severe anaphylactoid reactions to conventional ionic contrast media. Five of these patients had received corticoid premedication before injection of both conventional contrast medium and metrizamide; anaphylaxis occurred only after administratio…
A mechanical lithotripter of simple and robust design is described. With the aid of this device it proves possible to crush common bile duct and intrahepatic calculi that are otherwise too large to pass out spontaneously after papillotomy, or are inaccessible to other means of treatment. To date it has been used with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotolysis of organopolysilanes. Photochemical behavior of phenylethynyldisilanesMitsuo Ishikawa, Hiroshi Sugisawa, Takamasa Fuchikami, Makoto Kumada, Tokio Yamabe, Hiroshi Kawakami, Kenichi Fukui, Yutaka Ueki, and Haruo ShizukaCite this: J. Am. Chem. Soc. 1982, 104, 10, 287…
Examination of the isothermal crystallization and the effect of melting conditions on samples of isotactic polypropylene and its composite with talc, combined with electron-microscopic observation, has shown two types of heterogeneous nuclei effective in the crystallization process: (1) metastable nuclei, representing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermotropic liquid-crystalline behavior of some single- and double-chained pyridinium amphiphilesErnst J. R. Sudholter, Jan B. F. N. Engberts, and Wim H. De JeuCite this: J. Phys. Chem. 1982, 86, 10, 1908–1913Publication Date (Print):May 1, 1982Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structures of bis(4,4',6,6'-tetramethyl-2,2'-bipyridyl)copper(I) perchlorate, bis(4,4',6,6'-tetramethyl-2,2'-bipyridyl)copper(II) diperchlorate, and bis(4,4',6,6'-tetramethyl-2,2'-bipyridyl)copper(II) diperchlorate dihydrate. A search for copper(II) and…
Abstract Four pedons developed over serpentinite were characterized. Eluvial and illuvial processes have caused formation of weak‐to‐moderately‐expressed argillic horizons. Magnesium‐rich parent materials are responsible for the dominance of Mg on the exchange complex, except in surface horizons where H + prevailed. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew five- and six-coordinate imidazole and imidazolate complexes of ferric tetraphenylporphyrinRobert Quinn, Mario Nappa, and Joan S. ValentineCite this: J. Am. Chem. Soc. 1982, 104, 9, 2588–2595Publication Date (Print):May 1, 1982Publication History Published online1 May 20…
Type IV collagen was isolated in high yield from bovine kidney cortex. The protein revealed Mr = 380,000 and contained, in a 2:1 ratio, two different disulfide-linked polypeptide chains, C-1 and D-1 (Mr = 125,000). Carboxymethyl-cellulose chromatography before and after reduction proved that the two polypeptide chains…
Metal-binding properties of calmodulin have been studied by using trivalent lanthanide ions as analogs of Ca2+. In agreement with a report published as this work was in progress [Kilhoffer, M.-C., Demaille, J. G., and Gerald, D. (1980) FEBS Lett. 116, 269-272] we found that sites I and II are the high-affinity sites,…
Abstract It is frequently observed that the gel effect in vinyl polymerizations decreases in intensity at about the 50‐70% conversion level. This is apparent in both rate and molecular weight data. It is postulated that there should be a limitation on the decrease in the termination rate constant to explain this effec…
A molecular dynamics study of the thermodynamic, structural and dynamical properties of a model silicon dioxide glass is described. The system consists of 3000 ions in a cubic volume. The results of the present simulation are compared with the results of our earlier simulation of a small system containing only 375 ion…
The Gibbs energies of formation of three compounds in the , , and —have been determined from potentiometric measurements on reversible solid‐state galvanic cells and in the temperature range 850–1375 K. The results are discussed in the light of reported phase diagrams for the system. The partial pressures of different…
This paper presents the theoretical aspects and the experimental results of a study carried out at Ecole Polytechnique de Montrdal on wetting processes on a contaminated insulator surface. Four wetting processes for clean-fog test using the precontamination method are distinguished, namely, collision of water droplets…
The EPR spectra of the five-coordinated complexes [CoX(Me6tren)]Y (Me6tren = tris[2-(dimethylamino)ethyl]amine; X = C1, Br, I; Y = C1, Br, I, BPh,) and [CoX(np3)]Y (np3 = tris[2-(diphenylphosphino)ethyl]amine; X = CI, Br, I; Y = PFs, BPh4) have been recorded. The Me6tren complexes were found to yield g,, = 2 and g, =…
The preparation of the new ligand 1,4,7,10-tetramethyl-1,4,7,10-tetraazacyclododecane, (-N(Me)-(CH2)2-)4 (= L), and the complexes [NiL] (ClO4)2, [NiL(OCHNMe2)] (ClO4)2, [NiLN3] ClO4, [CuL] (ClO4)2, and [NiY] (ClO4)2, where Y = (-N(Me)(CH2)2N(Me)(CH2)3-)2, 1,4,8,11-tetra-methyl-1,4,8,11-tetraazacyclotetradecane, are de…
Abstract The exchange interactions in four kinds of verdazyl crystals, 2,4,6-triphenylverdazyl (TPV), 2,4,6-triphenyl-3-methylverdazyl (MeTPV), 2,4,6-tri-p-tolylverdazyl (TTV), and 2,6-di-p-tolyl-4-phenylverdazyl (DTPV), have been studied by means of McConnell’s spin density Hamiltonian. The calculated exchange parame…