ID#: 6684
Caption:
This photograph depicts the colonial growth pattern displayed by Providencia alcalifaciens bacteria cultured 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 appearance of a 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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