Renée Claude、José Antonio Real、Jacqueline Zarembowitch 等 9 位作者1990-10-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin transition in iron Fe(py)2L(NCS)2 complexes where py = pyridine and L = 2,2'-bipyrimidine (bpym) and 1,10-phenanthroline (phen): magnetic, calorimetric, and Moessbauer-effect investigation. Crystal structure of [Fe(py)2bpym(NCS)2].0.25pyRenee Claude, Jose Antonio Real,…
Metal complexes synthesis and propertiesMagnetism in coordination complexesMetal-Catalyzed Oxygenation Mechanisms
Steven P. Armes、M. Aldissi、S. F. Agnew 等 4 位作者1990-10-01Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics
Colloidal polyaniline has been prepared in acidic aqueous media by a modified chemical polymerization of aniline in the presence of a tailor-made polymeric surfactant. The surfactant which acts as a steric stabilizer used in this study is derivatized poly(vinyl alcohol-co-vinyl acetate). This surfactant contains penda…
Electrochemical sensors and biosensorsConducting polymers and applicationsAnalytical Chemistry and Sensors
Peggy Cebe、Sengshiu Chung1990-10-01Polymer Composites
Abstract We have been studying crystallization and melting behavior of high performance semicrystalline polymers to increase our understanding of the effects of processing on microstructure. Questions on development of morphology center around whether single or dual populations of crystals exist after melt processing,…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Stefano Ciurli、Shi Bao Yu、R. H. Holm 等 5 位作者1990-10-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic nickel-iron NiFe3Q4 cubane-type clusters (S = 3/2) by reductive rearrangement of linear [Fe3Q4(SEt)4]3- (Q = sulfur, selenium)Stefano Ciurli, Shi Bao Yu, R. H. Holm, K. K. P. Srivastava, and E. MunckCite this: J. Am. Chem. Soc. 1990, 112, 22, 8169–8171Publication D…
Organometallic Complex Synthesis and CatalysisMagnetism in coordination complexesMetalloenzymes and iron-sulfur proteins
Yasuaki Koyama1990-10-01FEMS Microbiology Letters
The host-vector system for an extreme thermophile, Thermus thermophilus HB27, was developed. The host strain has a mutation in tryptophan synthetase gene (trpB), and the mutation was determined to be a missense mutation by DNA sequence analysis. A Thermus-E. coli shuttle vector pYK109 was constructed. pYK109 consists…
Protein Structure and DynamicsBacterial Genetics and BiotechnologyEnzyme Structure and Function
M.S. Akselrod、В. С. Кортов1990-10-01Radiation Protection Dosimetry
Abstract To determine the mechanisms of the electron-hole processes in a-Al2O3:C crystals, characteristics of their thermo- and photo-stimulated exoelectron emission (TSEE, PSEE) and luminescence have been studied. It is shown that the emission of F+ centres takes place with the temperature shift relative to the emiss…
Luminescence Properties of Advanced MaterialsSilicon Nanostructures and PhotoluminescenceGa2O3 and related materials
James P. Collman、James E. Hutchison、Paul S. Wagenknecht 等 6 位作者1990-10-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn unprecedented, bridged dihydrogen complex of a cofacial metallodiporphyrin and its relevance to the bimolecular reductive elimination of hydrogenJames P. Collman, James E. Hutchison, Paul S. Wagenknecht, Nathan S. Lewis, Michel Angel Lopez, and Roger GuilardCite this: J.…
Porphyrin and Phthalocyanine ChemistryMetalloenzymes and iron-sulfur proteinsMetal-Catalyzed Oxygenation Mechanisms
W. Curtis Conner、Steven W. Webb、P. Spanne 等 4 位作者1990-10-01Macromolecules
4742-4747
Polymer crystallization and properties
G. D. Danilatos1990-10-01Journal of Microscopy
SUMMARY For proper understanding of image formation using charge carriers, it is shown that signal detection by means of induction must be considered. This explains the possibility of imaging insulators as well as other phenomena especially in the conditions of the environmental scanning electron microscope. In additi…
Electron and X-Ray Spectroscopy TechniquesNon-Destructive Testing TechniquesSurface and Thin Film Phenomena
D. Thirumalai、Raymond D. Mountain1990-10-01Physical Review A
The dynamical properties of two measures to probe ergodic behavior in Hamiltonian systems with a large number of degrees of freedom are investigated. The measures, namely, the energy metric d(t) and the fluctuation metric \ensuremath{\Omega}(t) are both based on the time-averaged energies of the individual particles c…
Material Dynamics and PropertiesTheoretical and Computational PhysicsComplex Systems and Time Series Analysis
Andreas Oser、G. Valet1990-10-01Angewandte Chemie International Edition in English
Abstract No Absract.
Advanced biosensing and bioanalysis techniquesDNA and Nucleic Acid ChemistryLanthanide and Transition Metal Complexes
Teofilo A. Abrajano、J.K. Bates、Alan B. Woodland 等 5 位作者1990-10-01Clays and Clay Minerals
Abstract Secondary minerals formed during simulated weathering of nuclear waste glasses have been identified by analytical electron microscopy. A complete description of the reacted glass, from the outermost surface in direct contact with the leachant solution to the reacting front that migrates into the bulk glass, w…
Glass properties and applicationsRadioactive element chemistry and processingNuclear materials and radiation effects
L. A. Bursill、Gerhard Braunshausen1990-10-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
Heavy-ion irradiation (14 MeVu−1 Pb ions) of zircon crystals gives rise to linear latent tracks of 80 Å diameter and length 140 μm. Direct observation of the track core, by high-voltage high-resolution electron microscopy at atomic resolution, reveals a core having roughly circular cross-section, with some facetting o…
Geophysical Methods and ApplicationsIon-surface interactions and analysisNuclear materials and radiation effects
John M. Hutchinson、Mark Ruddy1990-10-01Journal of Polymer Science Part B Polymer Physics
Abstract The response of glasses to three‐step thermal cycles in which the glass is poorly stabilized prior to reheating has been examined both theoretically and experimentally. Theory predicts that, during the heating stage of these cycles, a type of peak (called an upper peak) occurs which is quite different from th…
Material Dynamics and PropertiesGlass properties and applicationsMaterial Science and Thermodynamics
L.A. Bonney、R. F. Cooper1990-10-01Journal of the American Ceramic Society
The reaction layers between silicon carbide continuous fibers (Nicalon) and a calcium aluminosilicate glass‐ceramic (anorthite composition) matrix in hot‐pressed composites have been characterized both structurally and chemically using high‐resolution, field‐emission scanning transmission electron microscopy. Chemical…
Advanced ceramic materials synthesisGlass properties and applicationsSilicon Nanostructures and Photoluminescence
Joel Stavans1990-10-01Physical Review A
An experimental study of the temporal evolution of two-dimensional drained soap froths is presented. The long-time behavior of the froth shows a linear dependence of the average bubble area on time. By keeping nearly constant and thin plateau borders at all times, deviations from 120\ifmmode^\circ\else\textdegree\fi{}…
Theoretical and Computational PhysicsSurfactants and Colloidal SystemsPickering emulsions and particle stabilization
Christopher G. Peterson、R. Jan Stevenson1990-10-01Canadian Journal of Botany
Development of epilithic algal communities was monitored in fast- (29 cm∙s −1 ) and slow-current (12 cm∙s −1 ) outdoor experimental stream channels for 33 d following a simulated spate. Disturbance reduced diatom densities in both current regimes to equal levels, but recovery was more rapid in slow current. Maximum al…
Marine and coastal ecosystemsAquatic Ecosystems and Phytoplankton DynamicsDiatoms and Algae Research
Andrew J. Peacock、L. Mandelkern1990-10-01Journal of Polymer Science Part B Polymer Physics
Abstract Utilizing a newly developed apparatus, force‐length measurements were performed on a series of unfractionated random ethylene copolymers having different counit types and a wide composition range. By controling crystallization conditions, crystallinity levels could be varied over wide extremes and a complete…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesFiber-reinforced polymer composites
Chaim N. Sukenik、Natarajan Balachander、Lloyd A. Culp 等 5 位作者1990-10-01Journal of Biomedical Materials Research
The surface of titanium has been modified by covalent attachment of an organic monolayer anchored by a siloxane network. This coating completely covers the metal and allows controlled modification of surface properties by the exposed chemical endgroups of the monolayer forming surfactant. The attachment of such a film…
Polymer Surface Interaction StudiesAntimicrobial Peptides and ActivitiesDendrimers and Hyperbranched Polymers
J. C. Scaiano、Robert W. Redmond、B. Mehta 等 4 位作者1990-10-01Photochemistry and Photobiology
The triplet energy of alpha-terthienyl has been determined by heavy atom-induced optical absorption: the value of 39.7 +/- 1.5 kcal/mol is consistent with earlier energy transfer work. Combining this result with calorimetric data from optoacoustic calorimetry indicates that intersystem crossing occurs with at least 90…
Porphyrin and Phthalocyanine ChemistryElectrochemical Analysis and ApplicationsChemical Reactions and Mechanisms