Add time:08/16/2019         Source:sciencedirect.com

SummaryAll 33 investigated strains of Proteus penneri gave a green colour reaction with Kovacs' indole reagent after an incubation of about three days at 36°C. Furthermore, 26% of the 51 strains of Proteus mirabilis studied also showed the green colour reaction but somewhat more weakly. The initial compound of this reaction seems to be a product of tryptophan metabolism which is formed only under aerobic conditions.

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