Figure 10.

a Total content of phenolic compounds expressed as peak area per 1 mg dry weight. Strain E control and 7-day UV-exposed samples differ significantly (p = 0.001) in their amount of phenolics, as indicated with two asterisks; the differences in the other strains are not significant (n = 6 for E and G, n = 3 for B). Mean values + SD. b Representative HPLC chromatogram at 280 nm of a UV-exposed culture (E) revealing several different phenolic peaks. The control samples contained these compounds as well, only in lower concentrations per dry weight. Online absorption spectra of the four largest peaks are also given