Artículos de revistas: Recent submissions
Now showing items 721-740 of 4968
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(1995)A theoretical study of the conformational dependence upon internal rotation of molecular hardness and its correlation with the torsional potential energy is performed for two representative molecules that present rotational ...
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Study of Aqueous Tetradecyltrimethylammonium Bromide-Brij 35 Solutions by Ion Activity Measurements (1989)Measurements of surfactant ion (tetradecyltrimethylammonium) and counterion (bromide) activities in binary tetradecyltrimethylaznmonium bromide (TTAB)-Brij 35 surfactant mixtures have been performed by using ion-specific ...
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(American Institute of Physics Inc., 1996)Metallic point contacts and tunnel junctions with a small and adjustable number of conduction channels have been obtained in the last few years using scanning tunneling microscope and break junction techniques. For ...
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(1997)We use Humbert's reduction theory to introduce an obstruction for the unimodularity of minimal vectors of positive definite quadratic forms over totally real number fields. Using this obstruction we obtain an inequality ...
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(Marcel Dekker Inc., 1998)Let (E, Q) be a finite dimensional quadratic vector space over a finite field. For the natural representation π of the isometry group G of (E, Q) in the space L2(E) of all complex valued functions on E, we analyse when the ...
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(1993)Electronic absorption spectra for complexes CpFe(dppe)X [with X = Cl, I and CN; dppe = (Ph)2PCH2CH2P(Ph)2; Cp = η5-C5H5] and the cationic derivative [CpFe(dppe)NCCH3]PF6 in different solvents have been measured. The lower ...
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(Elsevier, 2004)From the resinous exudate of leaves of Haplopappus multifolius two new coumarins were isolated and assigned the structures 6-hydroxy-7-(5′- hydroxy-3′,7′-dimethylocta-2′,6′-dien)-oxycoumarin (1) and 6-hydroxy-7-(7′-hydro ...
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Cyclic voltammetric study of the nitro radical anion from nitrendipine generated electrochemically (1991)Electrochemical studies on nitrendipine using mixed aqueous/dimethylformamide (DMF) solvent have allowed us to generate the one-electron reduction product, the nitro radical anion, RNO.-2. The voltammetric technique has ...
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(1993)Oligosaccharides of different sizes were released from intact Citrus limon seedlings treated with endopolygalacturonase obtained from Alternaria alternata. Also, an increase of phenylalanine ammonia lyase (PAL) activity ...
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(1992)The ordering behaviour in quenched αCu-Al was investigated by differential scanning calorimetry (DSC) under rising temperature conditions and by electron diffraction. It was found that the ordering processes can be better ...
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Free energies of transfer of anions from water to cationic micelles from ionic exchange measurements (1981)Ionic exchanges for several anions in hexadecyltrimethylammonium (CTA) have been measured by ultrafiltration and by the shift in the concentration of ferric thiocyanate complex by CTA addition. The results are compared ...
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(R. Oldenbourg Verlag GmbH, 2003)KSbP2S6, monoclinic, P121 1 (No. 4), a = 6.605(1) Å, b = 7.651 (2) Å, c = 9.754(2) Å, β= 92.11 (3)°, V = 492.6 Å3, Z = 2, Rgt(F) = 0.018, wARref(F2) = 0.044, T= 293 K. © by Oldenbourg Wissenschaftsverlag.
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(1993)A new (non-Noetherian) symmetry transformation for the small oscillations problem is exhibited. A novel way to solve this classical problem, based on conservation laws constructed using the new symmetry, is presented. ...
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(1989)Many natural phenomena are governed by nonlinear recursive relations of the type xt+1=f(xt), where f does depend on t. We focus our interest on the particularly simple case xt+1=rtxt(1-xt), where rt adopts either periodically ...
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(1989)DIMBOA (2,4-dihydroxy-7-methoxy- 1,4-benzoxazin-3-one was found in nymphs of the aphids Metopolophium dirhodum and Sitobion avenae which had fed on DIMBOA-containing wheat seedlings and artificial diets. DIMBOA levels found ...
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(1987)The ground state potential energy curves of alkali (LiH to CsH) and alkaline-earth monohydrides (BeH to BaH) have been calculated. A pseudopotential formalism including a core-polarization potential has been used. For the ...
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(1990)Ab initio torsional potential functions for a series of representative sulphur-containing molecules are presented. A few interesting parameters determining the relevant characteristics of the intermediate conformations ...
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(1991)The aerial parts of Polyachyrus sphaerocephalus gave seven new eudesmane derivatives and a germacra-dien-diol while a reinvestigation of P. fuscus afforded a new caryophyllene, two nerolidolglycosides, a curcumene and two ...
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(Marcel Dekker Inc., 1997)Para-benzylideneacetones present a characteristic long distance charge transfer pattern, where the olefinic bridge (CH=CH) and the aromatic ring (Ph) carbon centers are perturbed according to the nature of the para-substituent ...
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(1996)A method to construct Hamiltonian theories for systems of both ordinary and partial differential equations is presented. The knowledge of a Lagrangian is not at all necessary to achieve the result. The only ingredients ...
