The present work investigated the inorganic carbon (C i ) uptake, fluorescence quenching and photo-inhibition of the edible cyanobacterium Ge-Xian-Mi ( Nostoc ) to obtain an insight into the role of CO 2 concentrating mechanism (CCM) operation in alleviating photo-inhibition. Ge-XianMi used HCO 3 -in addition to CO 2 for its photosynthesis and oxygen evolution was greater than the theoretical rates of CO 2 production derived from uncatalysed dehydration of
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