Studying and Comparison of antibacterial methanol extraction effects of isolated Cyanobacteria strains from water on human gastroenteritis causing bacteria

The presences of Cyanobacteria make numerous problems and its growths due to pollutes water with cyanotoxins that endangers human and aquatic health. Different species of cyanobacteria are known as producers of intracellular and extracellular metabolites with different biological activities like inhibiting and killing fungi and bacteria. The antibacterial effects of isolated cyanobacteria s strains from water sources were studied after preparing methanol extract with concertrations of 50 µl, 100 µl. ََAntibacterial properties of exteracts were determined by dilution in pipe method and its minimum inhibitory concentration was tested against some human pathogens like Staphylococcus aureus, Salmonella typhi, Bacillus cereus, E. coli and Proteus vulgaris with concentration of 0/0125g/ml and 0/025g/ml cause inhibition and death of Bacillus cereus, Proteus vulgaris and Salmonella typhi respectively and methanol extracts of Oscillatoria sp 2 with concentration of 0/0125g/m and 0/025g/ml can inhibited and killed S. typhi strains. This present survey shows methanol extracts of Oscillatoria has the more effects on pathogenic bacteria, but clinical usage needs more researches on mechanisem of function of cyanobacterial influential combinations on microbe factors.