Effect of UV exposure on the timing of the cell cycle phases of Prochlorococcus marinus PCC9511 cells grown over a 12 h/12 h light/dark cycle in batch culture. A, distribution of cells in G1 (blue), S (red) and G2 (green) phases for batch cultures of PCC9511 grown under HL. B, same for HL+UV conditions. The experiment was done in duplicates shown by filled and empty symbols. Note that only the UV radiation curve is shown in graph B since the visible light curve is the same as in graph A. White and black bars indicate light and dark periods. The dashed line indicates the irradiance level (right axis). HL, high light; PAR, photosynthetically available radiation; UV, ultraviolet radiation.
Kolowrat et al. BMC Microbiology 2010 10:204 doi:10.1186/1471-2180-10-204