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Comparison of both (A) maximum quantum yield (Fv/Fm) and (B) non-photochemical quenching (NPQ) of A. circinalis strains CS534, CS537 and CS541 growing in batch culture exposed at the optimum light intensity for growth. Samples were taken at exponential phase (day 5). Error bars represent standard deviation of three replicates. Different letters above the bars indicate means are significantly different at p < 0.05).
