1. Department of Physics, Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine
2. Department of Macromolecular Chemistry, Faculty of Chemistry, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
3. Laboratory of Electronic Microscopy, M.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Kyiv, Ukraine