1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
2. Swedish Algae Factory AB, Gothenburg 416 64, Sweden
3. Department of Chemistry − Ångström, Uppsala University, P.O. Box 523, 751 21 Uppsala, Sweden
4. Department of Physics and Astronomy, Uppsala University, P.O. Box 516, 751 20 Uppsala, Sweden