Nonperturbative results on the quark-gluon vertex

We present analytical and numerical results for the Dirac form factor of the quark-gluon vertex in the quark symmetric limit, where the incoming and outgoing quark momenta have the same magnitude but opposite sign. To accomplish this, we compute the relevant components of the quark-ghost scattering kernel at the one-loop dressed approximation, using as basic ingredients the full quark propagator, obtained as a solution of the quark gap equation, and the gluon propagator and ghost dressing function, obtained from large-volume lattice simulations.Comment: 8 pages, 6 figures. Talk presented by A.C.A at Xth Quark Confinement and the Hadron Spectrum, 8-12 October 2012, TUM Campus Garching, Munich, German

Seleccion para resistencia a insectos. Manejo de la plaga y metodologia de evaluacion y seleccion

Obtaining insect-resistant var. involves (1) searching for sources of resistance, (2) reconfirming levels of resistance, (3) hybriding, and (4) selecting resistant progenies. Sources of resistance can be obtained from native var., introduced foreign var., wild (uncultivated) materials, and materials of other species of the same genera. In beans, this search is done through mass screening of germplasm, in which reconfirmation of resistance is extremely important, since the method allows uniform distribution of the pests within the field and the var. evaluated are necessarily attacked by the insect. (CIAT)La obtencion de var. resistentes a insectos comprende 1) la busqueda de fuentes de resistencia, 2) la reconfirmacion de los niveles de resistencia, 3) la hibridacion y 4) la seleccion de las progenies resistentes. Las fuentes de resistencia se pueden obtener a partir de var. criollas, var. foraneas introducidas, materiales silvestres y materiales de otras especies del mismo genero. En el caso del frijol, esta busqueda se hace mediante seleccion masal de germoplasma, donde la reconfirmacion de la resistencia es importante, ya que permite que la plaga se distribuya uniformemente dentro del campo de cultivo y evita la ocurrencia de un escape de la var. evaluada al ataque del insecto. (CIAT