Chlorella (green algae; Chlorophyta) is a cosmopolitan genus with small globular cells. It includes strains with a high temperature tolerance since some strains can grow between 15 and 40 ° C. Chlorella strains grow auto trophically in an inorganic medium as well as in mixotrophic and heterotrophic conditions (e.g., with addition of acetic acid and glucose). At present, auto trophic production of Chlorella is carried out in open ponds, semiclosed tubular photobioreactors, or inclined cascades, since its high growth rate prevents contam ination by other microalgae (e.g., in Japan, Czech Republic, and Germany). Processing of Chlorella cells requires effective centrifugation and mechanical disin tegration of the cellulose cell wall.
Chlorella is the most cultivated eukaryotic alga since it is widely used as a health food and feed supplement, as well as in the pharmaceutical and cosmetics industry. It contains proteins, carotenoids, some immunostimulators, polysaccharides, vitamins, and minerals.
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