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Effects of NH4NO3 and light quality on the growth of Synechocystis. Synechocystis cells were grown under 30 μE m−2 s−1 white light (circles) and 10 μE m−2 s−1 PSII light (squares) in BG11 with (black) or without (white) 2 mm NH4NO3. Cell growth was monitored by measuring absorption (OD [optical density]) at 730 nm. Error bars represent sd based on mean values of three independent growth experiments.
