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Effects of oxygen concentration on the ratio between carotenoids and chlorophyll of Nannochloropsis sp. cultured at an irradiance of 100 μmol photons m−2 s−1. The absorption at 490 nm (A490) is used as measure for the carotenoid, and the absorption at 678 nm (A678) is used as measure (n = 6) for the chlorophyll
