Affiliation: | (1) Institute of Experimental Botany, Czechoslovak Academy of Sciences, Ke dvoru 15, 16630 Prague, Czechoslovakia;(2) Department of Polymers, Institute of Chemical Technology, Suchbátarova 3, 16628 Prague, Czechoslovakia;(3) Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, Heyrovského 2, 16206 Prague, Czechoslovakia |