Showing papers by "University of Valencia published in 1981"
TL;DR: The role of Farkas-Minkowski systems in semi-infinite programming is studied in this paper by means of duality, and, in the nonlinear case, in connection with optimality conditions.
Abstract: The Farkas-Minkowski systems are characterized through a convex cone associated to the system, and some sufficient conditions are given that guarantee the mentioned property. The role of such systems in semi-infinite programming is studied in the linear case by means of the duality, and, in the nonlinear case, in connection with optimality conditions. In the last case the property appears as a constraint qualification.
44 citations
TL;DR: In this paper, the relationship between b23 and χ23 interaction parameters for ternary systems toluene, poly(dimethylsiloxane), PDMS, polystyrene, PS, (3) and benzene (1)/PDMS(2)/PS(3) has been determined.
26 citations
TL;DR: Factors favouring callus proliferation and subsequent regeneration of plants from pollen grains of rice anthers (Oryza sativa L., cvx. Bahia, Girona, Balilla × Sollana and Sequial) were determined and root differentiation was observed in some of the obtained callus.
Abstract: Factors favouring callus proliferation and subsequent regeneration of plants from pollen grains of rice anthers (Oryza sativa L., cvx. Bahia, Girona, Balilla × Sollana and Sequial) were determined. Cultivar differences in response were found, such as a high rate of haploid plant regeneration.
26 citations
TL;DR: In this article, the formation equilibria are studied spectrophotometrically and by saline cryoscopy, showing that oxalic acid behaves in the same way as the tartaric acid and as the malic acid when there is an excess in the latter.
24 citations
TL;DR: In this article, a metodo de maximización de la información desconocida is used to deducir las distribuciones inicial and final de referencia.
Abstract: En el presente articulo se utiliza el metodo de maximizacion de la informacion desconocida para deducir las distribuciones inicial y final de referencia cuando se trata de hacer inferencias sobre el coeficiente de correlacion de una poblacion normal bivariante
19 citations
TL;DR: The effect of water depth on the light-harvesting pigments contents in Dictyota dichotoma (Hudson) Lamouroux and Udotea petiolata (Turra) Borgesen was studied and both species showed higher photosynthetic-pigments contents with increased depth or shade.
17 citations
TL;DR: Enol acetates of o-acetoxyacetophenones give chromones upon irradiation with uv-light as mentioned in this paper, which is the same as chromones obtained from chromone synthesis.
11 citations
TL;DR: In this paper, the differences in retention volumes between the different polymeric solutes have been interpreted in terms of differences in polymer-gel and polymer-solvent interactions, and the hydrogen bonding seems to be the main contribution to solute-substrate interactions.
Abstract: Elution curves on spherosil gels in pure and mixed eluents of poly(dimethylsiloxane), PDMS, and poly(methyl methacrylate), PMMA, as well as those of polystyrene, PS, just for comparison, have been determined. In a general way, PDMS elution volumers fit to those of PS, whereas PMMA elution curves shift to higher retention volumes. The differences in retention volumes between the different polymeric solutes have been interpreted in terms of differences in polymer-gel and polymer-solvent interactions. Hydrogen-bonding seems to be the main contribution to solute-substrate interactions.
11 citations
TL;DR: In this article, a topological obstruction is obtained, similar to results of R. Bott and J. Pasternack, to the existence of a metric on M for which ℱ is totally geodesic.
Abstract: Let M be a compact Riemannian manifold of dimension n, and let ℱ be a smooth foliation on M. A topological obstruction is obtained, similar to results of R. Bott and J. Pasternack, to the existence of a metric on M for which ℱ is totally geodesic. In this case, necessarily that portion of the Pontryagin algebra of the subbundle ℱ must vanish in degree n if ℱ is odd-dimensional. Using the same methods simple proofs of the theorems of Bott and Pasternack are given.
10 citations
TL;DR: In this paper, the two photon exchange contribution to lepton-hadron scattering is considered and a low momentum transfer theorem for the relevant amplitudes is proved under the assumptions of Lorentz covariance, gauge invariance, unitarity and analyticity.
9 citations
TL;DR: The interaction between hen egg-white lysozyme and Cu(II, or Co(II) cations has been studied by dilatometry, equilibrium dialysis-differential refractometry and viscometry at different metal cation concentrations in good agreement.
TL;DR: In this article, the feasibility of an intermediate step in the mechanism of photochemical isomerization of xylenes in acidic media is explored by using CNDO molecular orbital methods along the reaction path from 2,6-dimethylbenzenium ion to dimethylbicyclo[3.0]hexenyl cation.
TL;DR: In this paper, the authors discuss the limitation of the standard approach to exchange current effects from photonuclear sum rules and propose to look for an energy-independent contribution to the real part of the forward Compton-scattering amplitude below pion threshold.
Abstract: We discuss the limitation of the standard approach to exchange current effects from photonuclear sum rules. We propose to look for an energy-independent contribution to the real part of the forward Compton-scattering amplitude below pion threshold. Experimental data on photonuclear cross-sections are used to calculate the real part of the amplitude, by means of an once-subtracted dispersion relation. The analysis is made for2H,7Li and9Be at energies varying between 50 and 150 MeV. A remarkably stable value ofK=0.60 is extracted for deuterium. For 1p shell nuclei, the main uncertainty is due to the lack of data above 300 MeV.
TL;DR: The subcellular distribution of mannosyltransferases inSaccharomyces cerevisiae was studied following the separation of the plasma membrane from other intracellular membranous systems, and it was suggested that part of the total mannosytransferase activity of the Plasma membrane is located on its outer surface.
Abstract: The subcellular distribution of mannosyltransferases inSaccharomyces cerevisiae was studied following the separation of the plasma membrane from other intracellular membranous systems. Most of the activity was linked to internal membranes, and the rest was located at the level of the plasma membrane. Yeast plasma membranes coated on their external face with concanavalin A when incubated with GDP-[U-14C]mannose incorporated 20% less [U-14C]mannose in glycoproteins and 110% more in glycolipids than plasma membranes alone. This suggested that part of the total mannosyltransferase activity of the plasma membrane is located on its outer surface. A significant incorporation of radioactive mannose into trichloroacetic-acid-precipitable material was detected in incubations of protoplasts with GDP-[U-14C]mannose when incorporation of free mannose did not occur. Characterization of a product synthesized by the ectotransferase(s) was achieved after treatment of the radioactive plasma membranes by Triton X-100, which preserved the concanavalin A-mannoprotein complexes and removed a large amount of other plasma membrane components. A radioactive glycoprotein band with an apparent molecular weight of 94, 000 was identified as a product of the ectomannosyltransferase(s).
TL;DR: A mixture of 2,2-dibromo-12-chlorocyclododecanone (IIa) and 2,12-cdc-2-chloro-1-cycloundecene-1 carboxylate (IIIa) by Favorskii rearrangement gave selectively methyl 2,1.
TL;DR: In this paper, the isoenergetic lines of the interaction energy between a bare proton and ortho-, meta-, and para-xylene have been calculated in order to detect both the best approaching channel and the preferred protonation positions.
DOI•
01 Aug 1981
TL;DR: The complex formation occurring between tungstic acid and tartaric acid has been investigated in order to explain the optical activity of the acid in the presence of constant amounts of tungstric acid as discussed by the authors.
Abstract: The complex formation occurring between tungstic acid and tartaric acid has been investigated in order to explain the optical activity of tartaric acid in the presence of constant amounts of tungstic acid A new scheme of formation that includes three different complexes is presented, which explains the experimental results found in the literature
TL;DR: In this article, un grafoG=(X, E) with un single vertice insaturadop, se estudia el problem of encontrar, para todox∈X, un caminoM-alternado par que unax conp.
Abstract: Dado un grafoG=(X, E) con un solo vertice insaturadop, se estudia el problema de encontrar, para todox∈X, un caminoM-alternado par que unax conp. Se halla un algoritmo, y se plantea su aplicacion cara a dar una variante del Algoritmo de Edmonds en la que no haya que contraer los pseudovertices.
01 Jan 1981
TL;DR: Indium selenide photovoltaic devices are described in this paper, where the authors report an efficiency of 6% and ways of improvement are proposed to improve the efficiency of these devices.
Abstract: Indium selenide photovoltaic devices are described. Transport and photovoltaic properties are discussed. Efficiencies of 6% are reported and ways of improvement are proposed.
TL;DR: An apparatus for the study of avoidance conditioning in fishes is described, with shocking electrodes placed above and below the animals, and response is defined as swimming a predetermined distance in either direction along a circumferential path.
Abstract: An apparatus for the study of avoidance conditioning in fishes is described. The chamber is cylindrical in shape, with shocking electrodes placed above and below the animals, and response is defined as swimming a predetermined distance in either direction along a circumferential path. This apparatus has several advantages over the conventional shuttlebox: (1)There is little constraint on the direction of swimming; (2) the magnitude of response (swimming distance) required for avoidance can easily be varied over a wide range; and (3) variation in the effectiveness of shock with the position of the animal relative to the position of the electrodes is minimized. Some sample data obtained in a free-operant experiment with goldfish are presented.
TL;DR: In this article, a low momentum transfer theorem for the two photon exchange contribution to electron scattering is presented, and the dispersion effects are controlled by non analytic terms (around t = 0) determined from the electromagnetic nuclear polarizabilities.