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It frequently occurs that a biological assembly in a crystallographic asymmetric unit has more than one noncrystallographic symmetry operator. For instance, a tetramer might have the point group 222 or a spherical virus will have the point group 532. A self-rotation function searches for the direction and angle of rot…
Article Geometrische Größen und einfache Modellrechnungen für BO4-Gruppen was published on October 1, 1990 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 191, issue 1-4).
Abstract not Available.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolythioamide synthesis through chemical modification of polyamidesMylene Deletre and Guy LevesqueCite this: Macromolecules 1990, 23, 22, 4876–4878Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue 1 October 1990https://do…
Abstract A relative increase of the lattice parameters equal to 2.05 × 10 −3 ± 1.8 × 10 −4 is established by X‐ray analysis in ultradisperse powder diamond with average size of crystallites equal to 4.6 ± 0.4 nm as compared with the lattice parameter of a large‐crystal sample. The effect found for diamond as well as t…
Abstract Ausgehend von dem bekannten Konzept der lokalen Dauerfestigkeit werden Probleme bei dessen Anwendung auf martensitische Randschichten, insbesondere Laserhärtungsschichten, erörtert. Es wird eine Methode für die Berechung der Dauerfestigkeit randschichtgehärterer Proben bzw. Bauteile aus martensitisch härtbare…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon dioxide activation by a transition metal-silicon bond. Formation of silanecarboxylate complexes [Cp2Sc[.mu.-O2CSiR3)]2Brian K. Campion, Richard H. Heyn, and T. Don TilleyCite this: Inorg. Chem. 1990, 29, 22, 4355–4356Publication Date (Print):October 1, 1990Publication…
Krejsa, R. J., Bringas, P. Jr. & Slavkin, H. C. 1990 10 15: A neontological interpretation of conodont elements based on agnathan cyclostome tooth structure, function, and development. Lethaia, Vol. 23, pp. 359–378. Oslo. ISSN 0024–1164. Speculation about a conodont-cyclostome connection has led us to search for and e…
Synopsis Oil-in-water emulsions stabilized with nonionic emulsifiers change to water-in-oil emulsions as the temperature rises when the hydrophilic and lipophilic properties of the mixed emulsifier are just balanced. Preparation above the phase inversion temperature followed by rapid cooling yields emulsions that exhi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of polythioamidation in solution. 1. Reaction of mono- and bis(dithioester)s with excess amineMylene Deletre and Guy LevesqueCite this: Macromolecules 1990, 23, 22, 4733–4741Publication Date (Print):October 1, 1990Publication History Published online1…
Abstract New highly sensitive thermoluminescence detectors of universal application on the basis of anion-defect a-Al2O3:C single crystals have been developed. The decisive role of non-stoichiometry in forming luminescence properties of crystals has been ascertained by methods of optical, luminescent and exoemission s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new class of silicon compounds with interesting nonlinear optical effectsGerard Mignani, A. Kramer, G. Puccetti, I. Ledoux, G. Soula, J. Zyss, and R. MeyrueixCite this: Organometallics 1990, 9, 10, 2640–2643Publication Date (Print):October 1, 1990Publication History Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous solutions of poly(ethyloxazoline) and its lower consolute phase transitionF. P. Chen, A. E. Ames, and L. D. TaylorCite this: Macromolecules 1990, 23, 21, 4688–4695Publication Date (Print):October 1, 1990Publication History Published online1 May 2002Published inissue…
The neutron absorbing ceramic boron carbide was irradiated in the Phenix fast breeder reactor between 600 and 1500 °C. Selected pellets were observed at different magnifications using optical ceramography, scanning electron microscopy, and transmission electron microscopy. The bulk swelling was measured as a function…
The interrelation between the number of nearest-neighbor atomic bonds broken upon formation of a grain boundary in an fcc metal and the related zero-temperature boundary energy is investigated by atomistic simulation. Using both a Lennard–Jones and an embedded-atom-method potential, the structures and energies of symm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn EXAFS and IR study of the CO adsorption-induced morphology change in ruthenium catalystsTakanori Mizushima, Kazuyuki Tohji, Yasuo Udagawa, and Akifumi UenoCite this: J. Am. Chem. Soc. 1990, 112, 22, 7887–7893Publication Date (Print):October 1, 1990Publication History Publ…
Abstract When the density of n‐butyl branches in an ethylene–hexene copolymer increases from 0 to 4.6 butyls/1000 C, the rate of slow crack growth decreases by a factor of 10 4 . The activation energy for the process is nearly independent of branch density and is about 120 kJ/mol. It is the number of tie molecules and…
Two compounds of formula Mn(pfpr),(NITMe) (I) and [Mn(pfpr)2]2(NITMe)(IMHMe) (11), respectively, where pfpr = pentafluoropropionate, NlTMe = 2,4,4,5,5-pentamethyI-4,5-dihydr1o I-f -imidazolyl-I-oxy1 3-oxide, and IMHMe = 2,4,4,5,5-pentamethyl- 4,5-dihydroimidazole3 -oxide, have been synthesized. The latter crystallizes…
Electrochromism was studied with Nb 2 O 5 layers prepared by thermal oxidation of niobium. The Nb 2 O 5 layers are crystalline and the morphology and thickness of these films play an important role in the response of electrochromic process. Cyclic voltammetry and chronopotentiometry were carried out together with elli…
Abstract A fundamental property of electrostatic potentials is their additivity. This study demonstrates that the electrostatic potential of a negatively charged, cation-substituted phyllosilicate layer can be represented as the sum of two potentials. Viewing cation substitution as a defect, one potential is derived f…