Artículos de revistas: Recent submissions
Now showing items 961-980 of 4969
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(2007)The existence of idempotent elements in plenary train algebras of rank greater than 3, is an open problem to be solved. J. Carlos Gutierrez's results on plenary train algebras in Gutierrez (2000) are based on the underlying ...
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Determination of trace amounts of cobalt by solvent extraction-second derivative spectrophotometry (1993)A sensitive derivative spectrophotometric method is described for the determination of microamounts of cobalt based on the integration of liquid-liquid separation and reaction, in dichloroethane, of the analyte with ...
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(Elsevier, 1997)We present a theoretical study of the diffusion of Li, Na and K on a Cu(111) surface. Various diffusional paths are identified and characterized in terms of kinetic parameters such as diffusion constants and activation ...
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(1991)We introduce an approximate analytic solution for the S=1/2 one-dimensional antiferromagnetic Heisenberg model with coupling between nearest- and next-nearest-neighbor spins. Closed-form expressions for the ground state, ...
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(Birkhauser Verlag Basel, 1998)We characterized the induction of hydroxamic acids (Hx) by aphid infestation in the wild wheat Triticum uniaristatum by addressing the following questions: i) Do different leaves have similar responses to aphid damage?, ...
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(1983)The isolation of chilenone A from Laurencia chilensis and the determination of its structure by spectral and x-ray crystallographic techniques is described. © 1983.
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(Birkhäuser-Verlag, 1979)
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(John Wiley and Sons Ltd, 1998)Ground-state dipolar moments of oligomeric compounds, containing electron-donor (D) and electron-acceptor (A) groups as two terminal units of the polyenic bridge (D-wire-A), can well be described by means of a one-dimensional ...
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(Universidad Catolica del Norte, 2007)In this work we present a way to find asymptotic formulas for some solutions of second order linear differential equations with a retarded functional perturbation.
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(1985)The decomposition of the title compound (DIMBOA, 1) in aprotic solvents was analysed in terms of linear solvation energy relationships using donor numbers. The results indicate rate-limiting cyclic hemiacetal opening in ...
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(2003)C17H13NO2, monoclinic. P1211 (No. 4), a = 5.0336(5) Å, b = 13.964(2) Å, c = 9.025(2)Å,β = 98.56(1)°, V= 627.3 Å3, Z= 2, Rgt(F) = 0.069, wRref(F2) = 0.202, T= 293 K. © 2014, Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer ...
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(Kluwer Academic Publishers, 1990)
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(Sociedad Chilena de Quimica, 2000)Reaction of CpFe(dppe)I with dithiopyridine in methanol and in presence of NH4PF6 affords the new mixed valence complex {[CpFe(dppe)]2 - n - S - Py}(PF6)2 (1 ). Observation of an intervalence electron transfer affords the ...
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(1998)The rates electron transfer ket for the mixed-valence complexes [Cd(dppe)Fe-CN-MLn]+2, MLn = Cp(dppe)Fe, Mn(CO)2dppmP(OPh)3 and other cyanide bridged complexes were estimated from the intervalence transition parameters. ...
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(1993)Four amphetamine derivatives bearing a methylenedioxy group at positions 3 and 4 of the benzene ring and differing in their substitution at C(6) were studied by differential pulse voltammetry in aqueous media. These ...
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(2003)C32H28N2O3, tridinic, P1 (No. 2), a = 8.648(8) Å, b = 10.27(1)Å, c = 15.31 (2) Å, α = 80.69(3)°, β = 73.71 (2)°, v = 84.13(2)°, V = 1286.1 Å3, Z = 2, Rgt(F) = 0.119, wRref(F2) = 0.379, T= 293 K. © 2014, Oldenbourg ...
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(Birkhauser Verlag Basel, 1999)The among-leaves allocation of DIBOA, a hydroxamic acid associated with plant resistance, in the shoot of rye (Secale cereale) was evaluated over the vegetative development of the plant. The appropriateness of using the ...
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(1992)We present a variational approach to the Heisenberg antiferromagnetic model for spin 1/2 and anisotropic exchange, with an external longitudinal and transverse magnetic field. In the one-dimensional case, we calculate ...
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(1998)In this work we developed a method by flow injection analysis for the determination of ranitidine in pharmaceutical forms and urine, using a polarographic flow through cell as detection system which has been designed ...
