The organic solvent extracts of Chloroform, Methanol, Ethanol and isolated marine cyanobacteria strains were tested for antibacterial activity against Bacterial pathogens, Anti bacterial activity was based on the disc diffusion method. The results indicated that the Chloroform extract of cyanobacteria Synechococcus elongatus was maximum inhibition and showed tested microorganisms maximum inhibition was Bacillus subtilis (18mm) and minimum in Staphylococcus aureus (10mm), and followed ethanol extract of cyanobacteria Synechococcus elongatus maximum inhibition was showed in Bacillus subtilis (13mm), and minimum in proteus vulgaris (6mm), and minimum in methanol extract of cyanobacteria Synechococcus elongatus and inhibition of tested microorganism was showed maximum in proteus vulgaris (12 mm) and minimum Staphylococcus aureus (4mm). Therefore, suggested that further works performed on the isolation and characterization of the compound.
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