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Methyl Red and Voges-Proskauer Test Protocols

  • Author: Sylvia McDevitt1
  • VIEW AFFILIATIONS HIDE AFFILIATIONS
    Affiliations: 1: Skidmore College, Saratoga Springs, NY, 12866
  • Citation: Sylvia McDevitt. 2009. Methyl red and voges-proskauer test protocols.
  • Publication Date : December 2009
  • Category: Protocol
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Figure 1

FIG. 1. A positive methyl red test on Escherichia coli (left) and a negative methyl red test on Enterobacter aerogenes (right). The positive result given by Escherichia coli is indicated by the red color after the addition of methyl red reagent. The negative result given by Enterobacter aerogenes is indicated by the lack of change after the addition of methyl red. (Sylvia F. McDevitt, Skidmore College, Saratoga Springs, NY)

Source: December 2009
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Figure 2

FIG. 2. A positive Voges-Proskauer test on Enterobacter aerogenes (left) and a negative Voges-Proskauer test on Escherichia coli (right). The positive result given by Enterobacter aerogenes is indicated by the red color change after the addition of Barritt's A and Barritt's B reagents. The negative result given by Escherichia coli is indicated by the lack of color change after the addition of Barritt's A and Barritt's B reagents. (Sylvia F. McDevitt, Skidmore College, Saratoga Springs, NY)

Source: December 2009
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