1. Faculty of Agriculture, Department of Food Science and Technology, Laboratory of Food Microbiology and Hygiene; Aristotle University of Thessaloniki; P.O. Box 265 54124 Thessaloniki Greece
2. National Agricultural Research Foundation, Institute of Technology of Agricultural Products; S. Venizelou 1, Lycovrisi 14123 Athens Hellas
3. Agricultural University of Athens, Department of Food Science and Technology; Laboratory of Microbiology & Biotechnology of Foods; Iera Odos 75 Athens 11855 Hellas