1. Stephan Angeloff Institute of Microbiology Bulgarian Academy of Sciences Acad. G. Bonchev str., bl. 26 Sofia 1113 Bulgaria
2. Institute of Organic Chemistry with Centre of Phytochemistry Bulgarian Academy of Sciences Acad. G. Bonchev str., bl. 9 Sofia 1113 Bulgaria
3. Institute of Biophysics and Biomedical Engineering Bulgarian Academy of Sciences Acad. G. Bonchev Str., bl. 105 1113 Sofia Bulgaria