1. Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, PO Box 124, SE-22100 Lund, Sweden
2. Current address: Carlsberg Laboratory, GamLe Carlsberg Vej 10, DK-2500 Valby, Denmark.
3. Current address: Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltoftsplads, DK-2800 Lyngby, Denmark
4. AkzoNobel Surfactants, SE-44485 Stenungsund, Sweden.