1. Faculty
of Physics, St. Petersburg State University, Ulyanovskaya str. 3, Petrodvorets, St. Petersburg 198504 Russia
2. Belozersky
Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow 119991 Russia
3. Institute
of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi
Prospect V.O. 31, St. Petersburg 199004 Russia