Seven selected cyanobacterial species namely Nostoc linckia, Nostoc
muscorum, Oscillatoria acuminata, Anabaena variables, Oscillatoria
amphigranulata, Spirulina platensis and Phormidium purpurascens
were cultivated on suitable media. In this work, the growth rates of were
measured by optical density and dry weight, day after day. Spirulina
platensis biomass was harvested at the 16th day which about equaled
8.322 g/L dry biomass. Also the biomass of other selected
cyanobacterial species was collected at the 22nd day. The present work
was designed for the biosynthesis of AgNPs by seven cyanobacterial
species using their filtrate and biomass separately. Appearance of
surface plasmon band at 400 nm for filtrate and biomass indicated the
biosynthesis of AgNPs. UV-vis spectroscopy used to characterize
biosynthezied AgNPs and resulted in appearance of surface plasmon
band at 400 nm for filtrate and biomass