1. eCampus University, 22060 Novedrate, Como, Italy and CNR-IMM Bologna, Italy
2. SEIKO Life Science Laboratory, SEIKO Research Institute for Education, Osaka 540-659, Japan
3. Japan Fisheries Research and Education Agency, Kanagawa 236-8648, Japan
4. Institute of Biological Sciences, Department of Biotechnology, University of Zielona Góra, ul. Szafrana 1, 65-516 Zielona Góra, Poland
5. Environment and Health Department, Istituto Superiore di Sanitá, 00161 Rome, Italy