Abstract
The accuracy of the 14 C method of estimating photosynthetic rates was evaluated by comparing inorganic 14 C and 12 C uptake and release rates in three species of microalgae. Net photosynthesis was defined as the net decrease in inorganic 12 C concentration during a given light period. The axenic algae cultures were incubated in a continuous flow-chamber system and the experiments conducted as time-course studies in light and dark. All experiments were characterized by higher 14 C uptake rates than 12 C during the first part of the light period, but in many of the experiments the 14 C uptake approached the 12 C net photosynthesis by time (...)
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