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- XLD_agar abstract "Xylose lysine deoxycholate agar (XLD agar) is a selective growth medium used in the isolation of Salmonella and Shigella species from clinical samples and from food. It has a pH of approximately 7.4, leaving it with a bright pink or red appearance due to the indicator phenol red. Sugar fermentation lowers the pH and the phenol red indicator registers this by changing to yellow. Most gut bacteria, including Salmonella, can ferment the sugar xylose to produce acid; Shigella colonies cannot do this and therefore remain red. After exhausting the xylose supply Salmonella colonies will decarboxylate lysine, increasing the pH once again to alkaline and mimicking the red Shigella colonies. Salmonellae metabolise thiosulfate to produce hydrogen sulfide, which leads to the formation of colonies with black centers and allows them to be differentiated from the similarly coloured Shigella colonies.Other Enterobacteria such as E. coli will ferment the lactose and sucrose present in the medium to an extent that will prevent pH reversion by decarboxylation and acidify the medium turning it yellow.Salmonella species: red colonies, some with black centers. The agar itself will turn red due to the presence of Salmonella type colonies. Shigella species: red colonies.Coliforms: yellow to orange colonies.Pseudomonas aeruginosa: pink, flat, rough colonies. This type of colony can be easily mistaken for Salmonella due to the color similarities.XLD agar contains:".
- XLD_agar thumbnail Salmonella_growing_on_XLD_agar.JPG?width=300.
- XLD_agar wikiPageID "5361701".
- XLD_agar wikiPageLength "2978".
- XLD_agar wikiPageOutDegree "36".
- XLD_agar wikiPageRevisionID "679118264".
- XLD_agar wikiPageWikiLink Agar.
- XLD_agar wikiPageWikiLink Agar_plate.
- XLD_agar wikiPageWikiLink Ammonium.
- XLD_agar wikiPageWikiLink Category:Microbiological_media.
- XLD_agar wikiPageWikiLink Citric_acid.
- XLD_agar wikiPageWikiLink Coliform_bacteria.
- XLD_agar wikiPageWikiLink Decarboxylation.
- XLD_agar wikiPageWikiLink Deoxycholic_acid.
- XLD_agar wikiPageWikiLink Escherichia_coli.
- XLD_agar wikiPageWikiLink Fermentation.
- XLD_agar wikiPageWikiLink Ferric.
- XLD_agar wikiPageWikiLink Growth_medium.
- XLD_agar wikiPageWikiLink Hydrogen_sulfide.
- XLD_agar wikiPageWikiLink Lactose.
- XLD_agar wikiPageWikiLink Lysine.
- XLD_agar wikiPageWikiLink MRS_agar.
- XLD_agar wikiPageWikiLink PH.
- XLD_agar wikiPageWikiLink Phenol_red.
- XLD_agar wikiPageWikiLink Pseudomonas_aeruginosa.
- XLD_agar wikiPageWikiLink R2a_agar.
- XLD_agar wikiPageWikiLink Salmonella.
- XLD_agar wikiPageWikiLink Shigella.
- XLD_agar wikiPageWikiLink Sodium_chloride.
- XLD_agar wikiPageWikiLink Sodium_thiosulfate.
- XLD_agar wikiPageWikiLink Sucrose.
- XLD_agar wikiPageWikiLink Wikt:selective.
- XLD_agar wikiPageWikiLink Xylose.
- XLD_agar wikiPageWikiLink Yeast_extract.
- XLD_agar wikiPageWikiLink File:Salmonella_growing_on_XLD_agar.JPG.
- XLD_agar wikiPageWikiLinkText "XLD agar".
- XLD_agar wikiPageWikiLinkText "Xylose lysine deoxycholate".
- XLD_agar wikiPageWikiLinkText "Xylose".
- XLD_agar wikiPageUsesTemplate Template:Growth_media.
- XLD_agar wikiPageUsesTemplate Template:Microbiology-stub.
- XLD_agar wikiPageUsesTemplate Template:Reflist.
- XLD_agar subject Category:Microbiological_media.
- XLD_agar hypernym Medium.
- XLD_agar comment "Xylose lysine deoxycholate agar (XLD agar) is a selective growth medium used in the isolation of Salmonella and Shigella species from clinical samples and from food. It has a pH of approximately 7.4, leaving it with a bright pink or red appearance due to the indicator phenol red. Sugar fermentation lowers the pH and the phenol red indicator registers this by changing to yellow.".
- XLD_agar label "XLD agar".
- XLD_agar sameAs Q960502.
- XLD_agar sameAs XLD-Agar.
- XLD_agar sameAs m.0dhdh4.
- XLD_agar sameAs Q960502.
- XLD_agar wasDerivedFrom XLD_agar?oldid=679118264.
- XLD_agar depiction Salmonella_growing_on_XLD_agar.JPG.
- XLD_agar isPrimaryTopicOf XLD_agar.