ABSTRACT
Fig. 3.4 The absorbance spectra of the ethanol solutions of azulenes purified from vegetative microspores of Equisetum arvense, native pollen grains from Betula verrucosa, Petunia hybrida and Aescu/us hippocastanum as well as from pollen load (bee-collected). Sources: Roshchina e t al., 1995; 1997d; 2002.
