ID#: 6620
After 24-hours, this inoculated xylose-lysine-deoxycholate (XLD) agar culture plate cultivated colonial growth of Gram-negative, rod-shaped, and facultatively anaerobic, Serratia marcescens bacteria. Xylose Lyseine (XL) agar is used when trying to culture and isolate Gram-negative enteric bacilli, i.e., rods. 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 colored area indicates the deposition of hydrogen sulfide (H2S) under alkaline conditions. This culture was used in a presentation involving the description of the steps taken when attempting to define a new taxonomic species. The culturing of a new organism, using different agar media, photomicrographs, and chemical analyses are all tools used in the taxonomic investigative process.
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Content Provider(s): CDC
Creation Date: 1985
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.