ID#: 6709
Caption:
This photograph depicts the colonial growth pattern displayed by isolated Gram-negative, Citrobacter freundii bacteria on a xylose-lysine-deoxycholate (XLD) agar plate. Xylose lysine (XL) agar is used when trying to culture and isolate Gram-negative enteric bacilli. When XL agar is supplemented with sodium thiosulfate, ferric ammonium citrate, and sodium deoxycholate, it is then termed XLD agar, and is then an even more selective medium than XL alone. The presence of any black color indicates the deposition of hydrogen sulfide, (H2S) under alkaline conditions.
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Content Provider(s): CDC/ Dr. Theo. Hawkins
Creation Date: 1976
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.