987 resultados para Duijhuis, Hubertus, 1531-1581.


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Banco del conocimiento

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Banco del conocimiento

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We study the ultrasonic attenuation in layered superconductors using the Green's function formalism. General expressions are derived analytically and then calculated numerically by taking the nearest and next-nearest interactions in a disordered layered superconductor with random hoppings. Our results show huge anisotropics of ultrasonic attenuation in the superconductors and the strong dependence of ultrasonic attenuation on the temperature and the direction of polarization of the sound wave.

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Increasing citrate concentration, at constant ionic strength (30 mM) decreases the rate of cytochrome ~ reduction by ascorbate. This effect is also seen at both high (600 mM) and low (19 mM) ionic strengths, and the Kapp for citrate increases with increasing ionic strength. Citrate binds d both ferri -and ferrocytochrome ~, but with a lower affinity for the latter form (Kox . .red d = 2 mM, Kd = 8 mM) as shown by an equilibrium assay with N,N,N',N', Tetramethyl E- phenylenediamine. The reaction of ferricytochrome ~with cyanide is also altered in the presence of citrate: citrate increases the K~PP for cyanide. Column chromatography of cytochrome ~-cytochrome oxidase mixtures shows citrate increases the dissociation constant of the complex. These results are confirmed in kinetic assays for the "loose"site (Km = 20 pM) only. The effect of increasing citrate observable at the "tight" site (Km = 0.25 pM) is on the turnover number and not on the K . These results suggest a mechanism m where anion binding to cytochrome £ at the tight site affects the equilibrium between two forms of cytochrome c bound cytochrome oxidase: an active and an inactive one.

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Tesis (Maestría en Producción Animal) UANL

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We define a new graph operator called the P3 intersection graph, P3(G)- the intersection graph of all induced 3-paths in G. A characterization of graphs G for which P-3 (G) is bipartite is given . Forbidden subgraph characterization for P3 (G) having properties of being chordal , H-free, complete are also obtained . For integers a and b with a > 1 and b > a - 1, it is shown that there exists a graph G such that X(G) = a, X(P3( G)) = b, where X is the chromatic number of G. For the domination number -y(G), we construct graphs G such that -y(G) = a and -y (P3(G)) = b for any two positive numbers a > 1 and b. Similar construction for the independence number and radius, diameter relations are also discussed.

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Colecci??n de 48 diapositivas dirigidas tanto a los profesionales sociosanitarios como docentes con el objetivo de facilitar la realizaci??n de actividades de Educaci??n para la Salud y especialmente a la lucha antitabaco. El juego de diapositivas est?? formado por fotograf??as, esquemas, gr??ficos, datos epidemiol??gicos y dibujos que hacen referencia a los componentes del tabaco, los factores sociales e individuales que propician el tabaquismo, las consecuencias para la salud y ventajas y estrategias para dejar de fumar. La carpeta va acompa??ada de un folleto explicativo del contenido tem??tico de cada una de las diapositivas.

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La lucha por los derechos humanos es una tarea permanente y un desafío constante para lograr que los fines perseguidos por la Declaración Universal de los Derechos Humanos se vean reconocidos en la práctica. El objetivo de esta publicación es el acercamiento progresivo y práctico a distintos aspectos relacionados con los derechos humanos, desde un enfoque educativo.