1. Instituto de Biologia Experimental e Tecnológica; Apartado 12, 2781-901 Oeiras; Portugal
2. Instituto de Tecnologia Química e Biológica; Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras; Portugal
3. Max Planck Institute for Dynamics of Complex Technical Systems; Bioprocess Engineering Group, Magdeburg; Germany
4. Department of Chemical Engineering and Materials Science; University of Minnesota; Minneapolis USA