1. Department of Physics, Faculty of Physics and Technology, University of Plovdiv “Paisii Hilendarski”, 24 Tsar Asen Str., 4000 Plovdiv, Bulgaria
2. Division of “Food Technologies”, Institute of Food Preservation and Quality-Plovdiv, Agricultural Academy of Bulgaria, 154 Vasil Aprilov Blvd., 4003 Plovdiv, Bulgaria
3. Laboratory of Cellular Biosystems, The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 139, Ruski Blvd., 4000 Plovdiv, Bulgaria