Fig. 2
Determination of H2, O2, acetic acid, and CO2 levels in aerated cultures at different light intensities. H2 (a, e), O2 (b, f) and CO2 (d, h) levels were determined for the headspaces. Acetic acid (c, g) was determined in the media. Panels a to d correspond to measurements done in TAP media, whereas panels e to h correspond to measurements done in TAP media supplemented with DCMU. Aeration was performed by simply opening the caps of the vessels for 5 min in an sterile atmosphere every 24 h. H2, O2, and CO2 accumulation in the headspace were measured daily before aeration. For H2 and CO2, the accumulative productions were plotted. O2 levels are plotted as daily measurements. Represented data are average from at least three independent experiments