1. Department of Bioproducts and Biosystems, Aalto University, 02150 Espoo, Finland.
2. VTT Technical Research Centre of Finland Ltd., 02150 Espoo, Finland.
3. Department of Applied Physics, School of Science, Aalto University, 02150 Espoo, Finland.
4. Latvian Institute of Organic Synthesis, 1006 Riga, Latvia.
5. Department of Chemistry, University of Latvia, Jelgavas 1, LV-1004 Riga, Latvia.
6. Department of Biomaterials, Max Planck Institute of Colloids and Interfaces, D 14424 Potsdam, Germany.