ID#: 15374
This image depicted two test tubes. The tube at left, contained triple sugar iron (TSI) growth medium on a slant, and the tube at right contained O/F glucose medium. Each tube had been inoculated with a microorganism that was classified as being non-oxidative, and non-fermentative, which is evidenced through the lack of any color change in the O/F glucose medium (Rt), nor the TSI medium tube (Lt). The lack of color change in the O/F glucose medium (Rt), identified the organism as one that neither oxidizes nor ferments glucose, for in each case the medium would have been turned acidic, thereby, changing the medium to a yellow coloration. Had oxidation or fermentation occurred in the TSI tube (Lt), a color change to yellow, either in the butt alone, or throughout the tube, i.e., depending upon which sugars were metabolized, would have occurred.
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Content Providers(s): CDC/ R. E. Weaver, MD, PhD
Creation Date: 1971
Photo Credit:
CDC Organization
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.