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Fig. 2 | Biotechnology for Biofuels

Fig. 2

From: Sequential phototrophic–mixotrophic cultivation of oleaginous microalga Graesiella sp. WBG-1 in a 1000 m2 open raceway pond

Fig. 2

Changes of nitrate (orange circle) and acetate (blue up triangle) concentrations under different acetate feeding strategies. The Graesiella cultures were supplied with the same amount of nitrate (~ 1.3 mM) at the beginning, and acetate sodium were supplemented either by fed-batch mode during the whole culture period (E-FB strategy, a), before nitrate depletion (A-FB strategy, b) and after nitrate depletion (P-FB strategy, c), or by batch mode before nitrate depletion (A-B strategy, e) and after nitrate depletion (P-B strategy, f). The phototrophic culture (d) was not supplemented with any organic carbon during cultivation

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