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As a part of the investigation on useful compounds from microalgae, and its recently that marine planktonic algae have been recognized as potial sources of antibacterial and antifungal substances, we searched for antimicrobial active compounds from the extracts of six microalgae-Lyngbya sp., Tetraselmis sp., Microcystis sp., Chlorella sp., Navicula sp. and Rhalassiosira sp.-treated with several solvents. There were two active species-Lyngbya ap., Teraselmis sp.- in the antimicrobial activity test to bacteria, yeast and molds, especially the activity existed in the extracts by ethyl acetate of supernatants to the microalgae incubatio. and there won’t any activity in two diatoms to the test microorganism.
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