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L'ordre à courte distance dans les verres peut être étudié par différentes spectroscopies, sensibles soit à des facteurs géométriques (coordinance, distance métal-oxygène) soit de nature plus chimique (degré d'oxydation, covalence métal-oxygène). Nous présentons les résultats obtenus principalement sur les verres sili…
Abstract Crosslinking of 4,4′(bismaleimido)diphenyl ether (BM) was investigated in presence of bis( m ‐aminophenyl)methylphosphine oxide (BAP), tris( m ‐aminophenyl)phosphine oxide (TAP), diaminodiphenyl ether (E) and 3,3‐bis(p‐aminophenyl)phthalide (AP). These crosslinked resins were examined for thermal stability by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNatural ferric ionophores: total synthesis of schizokinen, schizokinen A, and arthrobactinByung Hyun Lee and Marvin J. MillerCite this: J. Org. Chem. 1983, 48, 1, 24–31Publication Date (Print):January 1, 1983Publication History Published online1 May 2002Published inissue 1 J…
Alumina single crystals were deformed in compression along the c axes at T= 625 to 1373 K. Large‐scale deformation by rhombohedral twinning was observed at a constant resolved shear stress of only 12.6 MPa between ∼900 and 1373 K. Below 900 K, the twinning stress for specimens with ground surfaces rose rapidly to 227…
Tetrathiafulvalenes. XIX. Synthesis and Properties of Electron Conducting Poly‐Dithiolene Complexes with Ethylene Tetrathiolat and Tetrathiafulvalene Tetrathiolat as Bridge Ligands [1,3]‐Dithiolo[4,5‐d]‐1,3‐dithiol‐2,5‐dione 7 and 5‐(5‐oxo[1,3]‐dithiolo[4,5–d]1,3‐dithiole‐2‐ylidene)[1,3]‐dithiolo[4,5–d]1,3–dithiol‐2‐o…
The gene for the MspI modification enzyme from Moraxella was cloned in Escherichia coli using the plasmid vector pBR322. Selection of transformants carrying the gene was based on the resistance of the modified plasmid encoding the enzyme to cleavage by MspI. Both chromosomal and plasmid DNA were modified in the select…
Abstract A number of samples of poly( D , L ‐lactic acid) (PLA) with weight‐average molecular weights M̄ w in the range 15,000–350,000 were prepared by a ring‐opening polymerization. The molecular weight distributions (MWDs) of these samples were determined by gel permeation chromatography (GPC). The method involves a…
The respiration of [35S] sulphate to [35S] sulphide by hydrogen-grown sulphate-reducing bacteria was used as a sensitive indicator to monitor cathodic hydrogen utilisation. The transient depolarisation of both mild steel and X65 pipeline steel electrodes, a rise in pH and a burst of hydrogen [35S] sulphide production,…
Anion voidage and anion void lattice formation in electron irradiated (100 keV–1 MeV) fluorite (CaF2) has been investigated by in situ transmission electron microscopy. At low fluences (≲1 dpa) the damage consists of randomly distributed anion voids and large bubble-like defects associated with fluorine gas. At higher…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphorus NMR study of solid amorphous calcium phosphateJames Tropp, Norman C. Blumenthal, and John S. WaughCite this: J. Am. Chem. Soc. 1983, 105, 1, 22–26Publication Date (Print):January 1, 1983Publication History Published online1 May 2002Published inissue 1 January 1983…
Nous considérons un solide poreux, ou un gel, saturé par un système fluide à deux composants, A, B, dans le domaine de température où A et B démixent; l’épaisseur 03BE de l’interface est supposée plus petite que la taille des pores. Le solide préfère être en contact avec la phase riche en A. Mais, si l’on fait décroît…
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A theoretical and experimental study of potential gradients in crevices between a piece of steel and an insulating coating has revealed that the condition of the steel surface and the potential of the steel at the coating holiday have important effects on the potential gradient. Holiday potentials more negative than t…
Articles by 75 leading authorities cover virtually every aspect of composite materials and provide detailed information on methods of manufacturing properties, uses of composite materials and components. Entries include tables, figures, and extensive references. Alphabetical organization, cross-referencing, and a deta…
Abstract Theoretical investigation shows that a transition in the solid state from form I to form II affects the solubility of a solid in a liquid. Experimental results for the solubility of phenanthrene in pyridine, which has a lambda‐point transition between 331 and 361 K, conform generally to the theoretical predic…
Proteins from the axonemes and disc cytoskeleton of Giardia lamblia have been examined by sodium dodecyl sulphate/polyacrylamide gel electrophoresis. In addition to tubulin and the 30 X 10(3) molecular weight disc protein, at least 18 minor components copurify with the two major proteins in Triton-insoluble structures…
Very hard diamondlike carbon films have been prepared with the aid of an ionized deposition technique. The growth mechanism of films deposited in the presence of methane gas is discussed. The properties of these carbon films are as follows: The concentration of hydrogen atoms contained in the films is almost negligibl…
Abstract
An unusual trimeric CuII species of formula [Cu3(OH)(pz)3(Hpz)2(NO3)2]·H2O (Hpz = pyrazole) has been prepared from air oxidation of [Cu(Hpz)2(NO3)] in the presence of moisture. The X-ray structure of the oxidation product has been determined by single-crystal diffractometer techniques, and has been compared with a few…
An equivalent electrical circuit that describes the electrode processes on different electrolytes, using porous Pt electrodes, is given. Diffusional processes are important and have to be presented by Warburg components in the circuit. The overall electrode process is rate limited by diffusion of atomic oxygen on the…