1. Laboratory of Bioprocess Engineering, Dept. of Biotechnology; Technische Universität Berlin; Sekr. ACK24, Ackerstr. 71-76 D-13355 Berlin Germany
2. Dept. of Process Engineering; Technische Universität Berlin; Sekr. KWT-9, Str. des 17. Juni 135 D-10623 Berlin Germany
3. School of Engineering Design & Technology; University of Bradford, Bradford, West Yorkshire; BD7 1DP UK
4. Dept. of Chemical Engineering; University of Patras; 26504 Patras Greece