Fig. 3

Growth and glycolate production of Chlamydomonas reinhardtii in a flat panel reactor. Biomass (A), cell numbers (B), Chl a concentration (C), Q_Phar (D), F_v/F_m (E), and glycolate accumulation (F) of two independent runs (run 1: open symbols; run 2: closed symbols). During the biomass phase (green shading), cultures were grown with 2% CO₂ in ambient air. Glycolate production was induced by switching aeration to 0.2% CO₂, 35% O₂ in ambient air. Arrows mark the time of additional 7 mM NH₄⁺ supply. The horizontal dashed line in (D) indicates the irradiated photosynthetically available radiation (PAR) of 250 µ mol photons m⁻² s⁻¹