Arthrospira platensis is a planktonic filamentous cyano bacterium composed of individual cells (about 8 mm in diameter), which grows in subtropical alkaline lakes with the temperature optimum above 35 °C. In produc tive cultures, Arthrospira is cultivated in shallow mixed ponds or semiclosed tubular photobioreactors. The growth medium contains inorganic salts with a high concentration of bicarbonate, keeping the pH value between 9 and 10. This cyanobacterium is the most cultivated photosynthetic prokaryote since its biomass is widely used as a health food, feed supplement, and as a source of fine chemicals. The total annual production of biomass reaches about 45001, 50% of which is in China. It contains proteins, polyunsaturated fatty acids, phycobiliproteins, carotenoids, polysaccharides, vita mins, and minerals.
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