The effect ethanolic extract of Nostoc linkia algae on growth of some bacterial species which isolated from waste water

Abstract

The effeciency of ethanolic extract of Nostoc linkia algae has been tested in reducing three species of bacteria Escherichia coli , Pseudomonas aeruginosa and Staphylococcus aureus which isolated from contamination water in Laboratory conditions 37 ْ C in period treatment 72 hour in different concentration (0.25 , 0.5 , 0.75 , 1 mg/l ). It became obvious that the ethanolic extract of Nostoc linkia algae has high effeciency in reducing different bacterial number in removing ratio 98.9% after 72 hour . in concentrate 1 mg/l for bacteriaa Escherichia coli and 94.6, 75.3% in concentrate 1 and 0.75 mg/l respectivelly for bacteria Pseudomonas aeruginosa and 94.7, 80.1% in concentrate 1 and 0.75 mg/l respectivelly for bacteria Staphylococcus aureus . associated with different significant for two concentrate 1 and 0.75 mg/l . The total bacterial number reducing in removing ratio 90.8% in concentrate 1 mg/l of ethanolic extract of Nostoc linkia algae after 24 hour of experiment.