1. Institut de Recherches Microbiologiques Wiame; Campus Ceria, 1 Av E. Gryzon B-1070 Brussels Belgium
2. Institut de Recherches Microbiologiques Wiame; Campus Ceria, 1 Av E. Gryzon B-1070 Brussels
3. Department of Chemistry; University of Namur; 61 Rue de Bruxelles B-5000 Namur Belgium