Evidence of the cost of the production of microcystins by Microcystis aeruginosa under differing light and nitrate environmental conditions.

Microcystis cell density was estimated by converting the OD at 750 nm into cell density (cells ml −1 ) based on the highly significant positive correlation between these two parameters (R 2 = 0.96, N = 44; P<10 −4 , data not shown).

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