Details - Public Health Image Library(PHIL)

ID#:

15374

Caption:

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.

High Resolution:

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Content Provider(s):

CDC/ R. E. Weaver, MD, PhD

Creation Date:

1971

Photo Credit:

Links:

Categories:

CDC Organization