PMID:21196

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Citation

DuPree, MR and Wilcox, G (1977) Bromothymol blue and carbohydrate-sensitive plating media.J. Clin. Microbiol. 6:343-7

Abstract

A new plating medium using bromothymol blue (BTB) indicator is described and compared with eosin-methylene blue (EMB), MacConkey, and Endo media. These media were tested with L-arabinose by plating fermenting and nonfermenting mutant strains of Escherichia coli. The minimum concentrations of L-arabinose that permitted differentiation of these strains were determined. Different concentrations were required for differentiating confluent patches of cells, isolated colonies, and closely spaced or adjacent colonies. L-Arabinose, L-rhamnose, D-lactose, and D-galactose were tested with modified enteric media and with BTB medium, again to determine minimum usable concentrations. BTB media and reformulated conventional media allowed detection of acidification, aerobically, at one-fifth to one-hundredth the (1%, wt/vol) concentration of carbohydrate used in standard indicator plates.

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Keywords

Aerobiosis; Arabinose; Bacteria; Bromthymol Blue; Carbohydrate Metabolism; Culture Media; Escherichia coli; Hydrogen-Ion Concentration; Indicators and Reagents; Mutation; Peptones; Stereoisomerism; Thymol

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