1. Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Straße 12; Bremen D-28359 Germany
2. Department Biology/Chemistry; University of Bremen, Leobener Straße 3; Bremen D-28359 Germany
3. Synthopol Chemie, Dr. rer. pol. Koch GmbH & Co. KG, Alter Postweg 35; Buxtehude D-21614 Germany