In this article we study the evolution of dispersal in a structured metapopulation model. The metapopulation consists of a large (infinite) number of local populations living in patches of habitable environment. Dispersal between patches is modelled by a disperser pool and individuals in transit between patches are exposed to a risk of mortality. Occasionally, local catastrophes eradicate a loc...

BACKGROUND Clostridium difficile is an important enteropathogen affecting humans, domestic animals, and wildlife. The objectives of this study were to 1) compare the prevalence and characteristics of C. difficile isolated from the feces of raccoons trapped on swine farms and conservation sites, and 2) investigate the role of raccoons as potential reservoirs for host-adapted strains of C. diffic...

El objetivo del estudio fue determinar las evidencias de validez Cuestionario Agresividad Premeditada e Impulsiva (CAPI–A) en una muestra escolares peruanos (N= 528) entre 12 a 18 años. cuestionario estuvo compuesto 24 ítems formato Likert 5 puntos. Se hallaron contenido (vo > ,70), así como estructura interna, se verificó el modelo dos dimensiones con adecuados índices ajuste (x2/gl = 4,27,...

The diagram showing off-center nested spheres which is traditionally used to illustrate the Doppler effect, misleading and its trigonometric analysis leads errors concerning light, because electromagnetic aberration effects conform a wavefront surface that not sphere but an ellipsoid stretched along trajectory of source. Cartesian polar equations spherical ellipsoidal wavefronts are compared he...

Abstract The IceCube collaboration has observed the first steady-state point source of high-energy neutrinos, coming from active galaxy NGC 1068. If neutrinos interacted strongly enough with dark matter, emitted would have been impeded by dense spike matter surrounding supermassive black hole at galactic center, which powers emission. We derive a stringent upper limit on scattering cross sectio...