“…Uptake of phosphate has been characterized in several strains of cyanobacteria; it is energy dependent (4,8,11,12,28) and shows saturation kinetics (8,11,12,18,27). The kinetic parameters for phosphate transport vary considerably among cyanobacterial strains; they are influenced by the composition of the medium (8,9,12,23) and by the nutritional state of the cells (13). In particular, phosphorous-deficient cells have elevated rates of phosphate transport (3, 10-12, 14, 15, 17, 27).…”