1. Department of Materials Science and Engineering, University of Ioannina, GR-45110 Ioannina, Greece, Department of Environmental and Natural Resources Management, University of Ioannina, GR-30100 Agrinio, Greece, Section de Bioenergetique, Departement de Biologie Celulaire et Moleculaire, CEA Saclay, 91191 Gif-Sur-Yvette, France, and Institute of Materials Science, NCSR “DEMOKRITOS”, Ag. Paraskevi-Attikis, GR-15310 Athens, Greece