Fig. 5B: Production of Hydrogen Sulfide but No Indole in SIM Medium

SIM medium turns black if hydrogen sulfide is produced from the reduction of sulfur. If Kovac's reagent remains yellow, indole is not 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