1. Limnological Institute SB RAS, 3, Ulan-Bator Str., Irkutsk, 664033, Russia
2. Laboratory of Polymer Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, 00014 HY Helsinki, Finland
3. Institute of Chemical Kinetics and Combustion, Institutskaya 3, Novosibirsk, 630090, Russia
4. Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS Great Britain