1. Department of Biomedical and Biotechnological Sciences University of Catania Torre Biologica, Via S. Sofia 97 Catania 95125 Italy
2. Department of Physics and Chemistry – Emilio Segrè University of Palermo Building 17, Viale delle Scienze Palermo 90128 Italy
3. Department of Chemical Sciences University of Catania Viale Andrea Doria 6 Catania 95125 Italy
4. Neuropharmacology Section OASI Institute for Research and Care on Mental Retardation and Brain Aging Troina 94018 Italy