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The activity of Rosmarinus officinalis (Rosemary) essential oil screened for multi medicinal or pharmaceutical and industrial purposes as an alternative for chemical solutions with long-term and devastating side effects. Eicherichia.coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Staphylococcus aureus causes severe infections because it's difficult to be treated and lead to persistent of infection, these pathogens have been developed a defense mechanism against a broad spectrum of antibiotics threatens the global public health. The highest antibacterial activity of the Rosmarinus officinalis against E.coli (MIC=10 4 μg/ml and MBC =10 4 μg /ml). Despite the splendid role of Chlorella sp. In production of biofuel basing on their high lipid containing, though, Chlorella and other algae have been became an obstacle to researchers in order to obtain unialgal culture (culture with only one species of algae) and our labs. were suffering from this problem during isolation of algae, 50,100,250,500 ppm from Rosemary essential oil were prepared. Results revealed very strong antagonistic effects of the essential oil concentrations on Chlorella vulgaris growth rates by measuring the amount of chlorophyll a. Generally growth rates decreased as the time and the concentrations of the essential oil increased comparing with the growth rate of standards (algae free from the essential oil) which exponentially increased along with time. Chlorella was sensitive to the allelopathic effect of this oil.

Potential Use of Rosemary (Rosmarinus officinalis L.) Essential Oil as Anti-Bacterial and Anti -Algal