Artículos de revistas: Recent submissions
Now showing items 4741-4760 of 4968
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(SOCIEDADE BRASILEIRA FISICA, 2006-03)Cluster architecture and lithium motion dynamics are investigated in nanocomposites formed by the intercalation of lithium and a dialkylamine (diethylamine, dibutylamine and dipentylamine) in molybdenum disulfide by means ...
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(WILEY-V C H VERLAG GMBH, 2006-01-16)Small cycloalkynes possess a pi-strain-induced electrophilicity related to the bending of the C-SP3-C-SP-C-SP bond angle. For cyclopentyne and benzyne, the electrophilicity index defined in the context of density functional ...
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(AMER CHEMICAL SOC, 2006-01-10)The pyridine-containing copolymers {NP(O2C12H8)](x)[NP(OC5H4N)(2)](1-X)}(n), with X = 0.7 (3a) and X = 0.8 (3b), and their respective organometallic derivatives of approximate formula {[NP(O2C12H8)](x)[NP-(OC5H4N circle ...
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(SPRINGER, 2006-06)Pyrolysis in air at 800 degrees C of [{NP(OC12H10)}(0.6){NP(OC6H4PPh2 center dot(pi-CH3C5H4)-Mn(CO)(2))(2)}(0.4)] (n) (1) in the solid state affords product 2 containing nanoclusters of Mn2P2O7 with sizes ranging from 50 ...
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(SPRINGER, 2006-10)The reaction under very mild conditions of the polyspirophosphazene copolymer with pendant diphenylphosphine groups {[NP(O2C12H8)](0.85)[NP(OC6H4PPh2)(2)](0.15)}(n) (I) (O2C12H8= 2,2'-dioxybiphenyl) with [Au(THT)Cl] (THT ...
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(SPRINGER, 2006-09)Pyrolysis in air of the carborane-substituted polyphosphazene, {[NP({OCH2}(2)C2B10H10)](0.5) [NP({OCH2}(2)C2B9H10 center dot NBu4)](0.5)} (n) affords BPO4 crystals of varied sizes in the micro and nano regime.The materials ...
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Organometallic derivatives of polyphosphazenes as precursors for metallic nanostructured materials (SPRINGER, 2006-12)Co-polyphosphazenes containing anchored organometallic fragments are useful precursors for nanostructured metallic materials. Pyrolysis in air at 800 degrees yields metallic nanoparticles of the type, M degrees/M (x) O (y) ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-11)An extensive computational study of thiophene-2-aldehyde conformers syn and anti has been carried out using density functional (DFT). From these calculations, B3LYP/6-31G(d) has been chosen as it produces results remarkably ...
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(AMER CHEMICAL SOC, 2006-06-26)We report scalar relativistic and Dirac scattered wave (DSW) calculations on the heptacyanorhenate [Re(CN)(7)](3-) and Re(CN)(7)(4-) complexes. Both the ground and lowest excited states of each complex split by spin-orbit ...
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(ELSEVIER, 2006-04-28)We report scalar and four component relativistic density functional calculations on octacyanorhenate [Re(CN)(8)](2-) and [Re(CN)(8)](3-) complexes. The relativistic calculations predict that the molecular g-tensor of the ...
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(SOCIEDAD BIOLGIA CHILE, 2006-12)Most Chilean amphibians belong to the subfamily Telmatobiinae (Anura, Leptodactylidae). Several phylogenetic studies of Leptodactylidae and Telmatobimae, based principally on morphological characters, have implicitly ...
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Artificial neural networks applied to quantitative elemental analysis of organic material using PIXE (ELSEVIER, 2006-08)An artificial neural network (ANN) has been trained with real-sample PIXE (particle X-ray induced emission) spectra of organic substances. Following the training stage ANN was applied to a subset of similar samples thus ...
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(VERLAG Z NATURFORSCH, 2006-10)Contents of the hydroxamic acids 2,4-dihydroxy-1,4-benzoxazin-3-one (DIBOA), and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) in leaves and roots of 14 cultivars of rye, Secale cereale L., were determined. Dynamics ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-06)Polychlorinated biphenyls (PCBs) are one of the most widely distributed classes of chlorinated chemicals in the environment. For cleanup of large areas of PCB-contaminated environments, bioremediation seems to be a promising ...
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(AMER INST PHYSICS, 2006-01-28)The electrophilicity index is analyzed within the framework of spin-polarized density-functional theory. In this context, constrained philicities, omega(N)equivalent to(mu(N))(2)/(2 eta(NN)), are introduced in order to ...
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(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2006-07)The combination of accessible embryology and forward genetic techniques has made zebrafish a powerful model system for the study of vertebrate development. One limitation of genetic analysis is that the study of gene ...
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(AIR & WASTE MANAGEMENT ASSOC, 2006-02)Daily particle samples were collected in Chillan, Chile, at six urban locations from September 1, 2001, through September 30, 2003. Aerosol samples were collected using monitors equipped with a Sierra Andersen 246-b cyclone ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-03-13)The reactions of quinuclidines with phenyl, 4-methylphenyl, and 4-chlorophenyl 2,4-dinitrophenyl carbonates are kinetically evaluated in aqueous solution. The Bronsted-type plots (log k(N) vs pK(a) of quinuclidinium ions) ...
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(UNIV CHICAGO PRESS, 2006-10)Anuran metamorphosis is one of the most spectacular processes in nature. Metamorphosis entails morphological transformations and extensive changes in feeding habits, such as transforming from an herbivore to a carnivore. ...
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(PERGAMON-ELSEVIER SCIENCE LTD, 2006-01-02)The phosphazene copolymers {[NP(O2C12H8)](0.5)[NP(O-C6H4-CO2Pr")(O-C6H4-L)](0.5)}(n) [L=CN (1), PPh2, (2)] and {[NP(O2C12H8)](0.6)[NP(O-C6H4-CO2Pr")(O-C6H4-L)](0.4)}(n) (3) have been synthesized by sequential substitution ...
