1. Department of Biological, Geological and Environmental Science, University of Catania, 95124 Catania, Italy
2. Experimental Zooprophylactic Institute of Sicily “A. Mirri”, 90129 Palermo, Italy
3. Department of Chemical, Biological, Pharmacological and Environmental Science, University of Messina, 98166 Messina, Italy
4. Department of Chemical Sciences, University of Catania, 95124 Catania, Italy
5. CNR-IMM, 95123 Catania, Italy