BACKGROUND: Chlorella strains rather than terrestrial oil crops having higher oil content and shorter generation time have been considered as promising candidates for alternative biodiesel. Since the influence of light quality on oil formation of microalgae in either monoculture or mixed culture has been shown to be either inconsistent or ambiguous, a light-emitting diode (LED) photo-bioreactor with different light sources and intensities was used in this study to investigate a cost-effective lipid production process.
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