1. Institute of Organic Chemistry; Bulgarian Academy of Sciences; G. Bonchev 9; Sofia 1113; Bulgaria
2. 1UPMC Univ. Paris 06, UMR 7144, Equipe Ecophysiologie: Adaptation et Evolution Moléculaires, Station Biologique de Roscoff, 29682, France; 2CNRS, UMR 7144; Station Biologique de Roscoff; 29682; France
3. CNR-ISTM; Corso Stati Uniti 4; 35129; Padova; Italy
4. Department of Biology, Section of Biophysics and Molecular Physiology; University of Padova; Via Ugo Bassi 58/B; I-35121; Padova; Italy