Abstract
Growth efficiency (c) and specific maintenance rate constant (μ e) were determined in continuous cultures of the cyanobacterium Oscillatoria agardhii Gomont, in light energy-limiting conditions, according to the formula μ = cq E-μ e in which q E is the specific light energy uptake rate. Values of the efficiency factor c varied with irradiance from 0·23 at 0·5 W m−2 to 0·05 at 40 W m−2. The specific maintenance rate constant was 0·001 h−1. The culture pH value influenced c and μ e . A diurnal light/dark cycle with a 16 h photoperiod did not affect either of the two parameters, μ e and c. The relationship between growth rate and light energy uptake rate, embodied in the above formula, was also valid for nitrogen (nitrate)-limited cultures.
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