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Effects of minerals on competition between CHA0 and spontaneous orange mutants. NBY broth (control), dilute (0.1×) NBY broth, dilute NBY broth containing NaCl, or NBY broth containing minerals was inoculated with a low but detectable level of orange mutants (approximately 0.3%). After 48 h, the percentage of mutants was determined. The bars indicate means based on 16 cultures; error bars indicate standard errors. Fisher's protected LSD0.05 value was 6.71%.
