1. Institute of Technical Biochemistry; University of Stuttgart; Allmandring 31 70569 Stuttgart Germany
2. IBG-1: Biotechnology; Forschungszentrum Jülich GmbH; 52425 Jülich Germany
3. Institute of Biochemical Engineering; Technical University of Braunschweig; Rebenring 56 38106 Braunschweig Germany
4. RWTH Aachen University; AVT.EPT; Worringerweg 1 52074 Aachen Germany