Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content


This photograph depicts the colonial growth pattern displayed by the Gram-negative, enteric bacterium Yersinia enterocolitica, cultivated on this triple sugar iron agar (TSI) medium. TSI is used when differentiating bacteria, primarily from the family Enterobacteriaceae, according to their ability to ferment glucose, lactose or sucrose, as well as produce hydrogen sulfide, (H2S). If a yellow coloration results, as on the right, it means that there was ongoing fermentation while if a reddish color results, as on the left, it means that there was no fermentation taking place.
High Resolution: Click here for hi-resolution image (6.26 MB)
Content Providers(s):CDC
Creation Date:1976
Photo Credit:
CDC Organization
Skip Navigation Links.

Skip Navigation Links.
Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.