Fig. 16: Escherichia coli Growing on XLD Agar

E. coli on XLD agar

Acid from fermentation lowers the pH and turns the phenol red from red (alkaline) to yellow (acid). No hydrogen sulfide is produced.

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Microbiology Laboratory Manual by Gary E. Kaiser, PhD, Professor of Microbiology
is licensed under a Creative Commons Attribution 4.0 International License.
Last updated: September, 2017