We have performed photometric optical observations of a sample of 16 radio loud and 16 radio quiet quasars. The aims were to confirm the existence of microvariations in strictly radio quiet objects, and to compare the properties of the variations in both types of quasars. The samples were defined in such a way, that the only observational

This article presents a theoretical framework for the evolution of light element nuclides in the Galactic disc. The authors use two key assumptions: infall of metal-poor gas to the disc at an increasing rate, and destruction of fragile nuclides in hot relatively dense supergiant envelopes. Light nuclides are accelerated by supernova shocks, and

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We present in this contribution the predictions on the multiwavelength spectral energy distribution of our evolutionary population synthesis models including single and binary stellar systems. The high energy computations include the emission associated to X-ray binaries and supernovae remnants, as well as the mechanical energy released into the