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Scanning electron micrograph (SEM) of Scenedesmus sp. after several extraction processes (top: 1000x, bottom: 2000x); (a) control (only solvent extraction without any pretreatment), (b) solvent extraction with homogenization pretreatment, (c) solvent extraction with microwave pretreatment, and (d) solvent extraction with ultrasonification pretreatment.
