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Antimicrobial activity of acetone extracts. Antimicrobial activity was indicated by zones of inhibition of growth or halos. Taking into account the diameter of the halo, the susceptibility of the different microorganisms to the extracts was classified in four reference groups: (A) 0.5–1 cm (+) in Bacillus cereus; (B) 1–2 cm (++) in Staphylococcus aureus; (C) 2–4 cm (+++) in Dunaliella bardawil and (D) 4–6 cm (++++) in Dunaliella salina.
