| isolation and characterization of microcystins from a river nile strain of oscillatoria tenuis agardh ex gomont. | the river nile is the major source of drinking water in egypt, however, increased eutrophication due to agricultural, municipal and industrial runoff has contributed to the growth of toxin producing cyanobacteria. this study describes the isolation and characterization of microcystins (mcysts), cyclic heptapeptide hepatotoxins, from a rare strain of oscillatoria tenuis, isolated from the river nile at sohag province in july 1995. the mcyst concentration of laboratory-cultured o. tenuis strain e6 ... | 2000 | 10858515 |