Figure 1.

Growth of R. erythropolis measured as OD at 600 nm at 236 W s⁻² illumination with white (standard warm white), blue (455 nm), green (510 nm) and red (680 nm) light as well as control cultivated under exclusion of light, n = 3. (a) Growth for 122 h. (b) Growth for 94 h with two additional wavelengths (425, 470 nm) of blue light; biomass formation (dry cell weight) and carotenoid accumulation (normalized to dry cell weight) of R. erythropolis at 236 W s⁻² illumination with white (SWW), blue (455 nm), green (510 nm) and red (680 nm) light as well as a control, * p < 0.05, ** p < 0.01, *** p < 0.001 (t-tests evaluated against respective non-illuminated control), n = 3. (c) Biomass formation and carotenoid accumulation of R. erythropolis at 40 h and 122 h. (d) Biomass formation and carotenoid accumulation of R. erythropolis at 40 h and 94 h with two additional wavelengths (425, 470 nm) of blue light.