Figure 2

Conventional lipid determination: (a) bioreactor with outer diameter of 10 cm, an inner diameter of 5 cm and a height of 40 cm.(b) comparison between () lipid content and (
) relative fluorescence intensity. (c) Fluorescence microscopy images of Scenedesmus sp. cells stained with Nile Red and showing lipid accumulation after 1, 11, 14, 20 and 23 days of nitrogen starvation in cultures.