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Antibiotic producing bacteria were selected using a new screening method. Eight strains of antibiotic producing bacteria, which required a spent medium of fungi for antibiotic production, were isolated. One of them, a potent producer of antibacterial antibiotic, designated strain W-315, had following taxonomical characteristics; aerobic, Gram-negative, rod shaped and polar flagellated. Furthermore, the organism could grow under acidic conditions (pH 4.5) and had a GC content of 64.4 mole per cent. We concluded that the strain W-315 belonged to Gluconobacter sp. When this bacterium was inoculated into Czapek-Dox medium, bacterial growth and antibiotic production did not occur. The antibiotic production was also not observed even when poor growth was observed in Czapek-Dox medium supplemented with ammonium sulfate. The nutritional requirements for the antibiotic production were also discussed.

journal of antibiotics

New polyenic antibiotics active against Gram-positive and -negative bacteria. II. Screening of antibiotic producers and taxonomical properties of Gluconobacter sp. W-315.