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The aim of the current study was to carry out a retrospective analysis of heavy metal (Pb, Cd, and Hg) levels in liver and kidney of 38 dogs living in an urban habitat (city of Naples). Tissues were homogenized, digested in a microwave digestion system, and analyzed by atomic absorption spectrometry. The results of\ud this study showed generally low levels of heavy metals in tissues of all examined dogs; only mercury concentrations in kidneys of pet dogs were higher than in stray dogs, and no significant age-dependent differences in metal levels were shown between the two groups. In conclusion, these results suggest the involvement of ad hoc-formulated pet food exposure to heavy metals in domestic animals

Las distintas variantes del estudio experimental del proceso de aniquilación electrón-positrón brindan información valiosa sobre la estructura iónica y electrónica de un sólido. Con ellas se obtienen parámetros tales como el tiempo de vida del positrón, vinculado a la densidad electrónica del medio, o datos relacionados con el momentum del par que se aniquila en un sólido. Para comprender el fenómeno en su total magnitud es conveniente contar con un soporte teórico. En tal sentido, los cálculos ab-initio se han convertido en una herramienta fundamental. En el presente trabajo, se pone particular énfasis en el estudio de los procesos de aglomeración de vacancias en metales puros mediante el uso de cálculos a primeros principios. Palabras Claves: PALS, DFT, defectos, aglomeración de vacancias Using Positron-annihilation spectroscopy (PAS) detailed experimental information about electronic and atomic structure of a solid can be obtained. PAS measurements generally use three techniques. Positron lifetime measurements give information about electron density at the annihilation place. On the other hand, Doppler broadening and angular correlation measurements give information about electron momentum distribution. So, the electronic configuration of the material studied is reflected in the positron annihilation parameters.In this work, we study the vacancy clustering process in pure metals using ab-initio calculations....