Bacteria‐free cultures of the prasinophyte Micromonas pusilla (Butcher) Monton and Parke, UTEX LB 991, were produced by intially determining the effects of several antibiotics on the growth of this alga and then using a combination of these antibiotics to eliminate associated bacteria, Micrononas pusilla was resistant ot penicillin G, neomycin, gentamicin and streptomycin at bactericidal concentrations but sensitive to chloramphenicol and polymixin B. Passage of M. pusilla through the sequence of antibioties penicillin G → neomycin → gentamician → kanamycin resulted in an axenic culture of M, pusilla this method should be suitable for producing axenic culture of other strains of M. pusilla.
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Cottrell et al. (1993) studied this question.
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