Figure 2.

Net rate of photosynthetic O₂ evolution as a function of white light irradiance (PAR) for steady-state cultures sampled from the turbidostat with (■) 224 μmol photons m⁻² · s⁻¹ of 680 nm light only or (●) 49 and 52 μmol photons m⁻² · s⁻¹ of 630 and 680 nm light, respectively. The measurements were initiated within 5 min of reactor sampling.