Hektoen enteric agar ( HEK , HE or HEA ) is a selective and differential agar primarily used to recover Salmonella and Shigella from patient specimens. HEA contains indicators of lactose fermentation and hydrogen sulfide production; as well as inhibitors to prevent the growth of Gram-positive bacteria . It is named after the Hektoen Institute in Chicago, where researchers developed the agar.
9-590: [REDACTED] Look up HEA , hea , or hea' in Wiktionary, the free dictionary. HEA or Hea may refer to: Education [ edit ] Higher Education Academy , a British charity Higher Education Act of 1965 , United States Higher Education Act 2004 , United Kingdom Higher Education Authority , Republic of Ireland Science [ edit ] Hektoen enteric agar , used in microbiology to identify certain organisms High-entropy alloys ,
18-439: A black precipitate in the presence of H 2 S, allowing Shigella – which does not produce H 2 S, and appears as green colonies – to be distinguished from Salmonella – which does produce hydrogen sulfide and appears as black colonies. Few sulfur-reducing bacteria exist other than Salmonella , which can be isolated from the intestines. Most of these are inhibited on HEA plates by the inclusion of bile salts , so encountering
27-473: A new class of multi-component alloys in materials science Hea (cicada) , a genus of cicadas Other uses [ edit ] Happily ever after , a fairytale ending Herat International Airport (IATA: HEA ) Hockey East Association , an American hockey conference See also [ edit ] Happily Ever After (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with
36-473: A new class of multi-component alloys in materials science Hea (cicada) , a genus of cicadas Other uses [ edit ] Happily ever after , a fairytale ending Herat International Airport (IATA: HEA ) Hockey East Association , an American hockey conference See also [ edit ] Happily Ever After (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with
45-620: Is to discriminate between Shigella and Salmonella , although many other species may grow on these plates. However, while the other bacteria may be clinically relevant, the assay does not discriminate among them. Effectively, HEA uses a metabolic assay to divide colonies into " Salmonella and Shigella " and "everything else". Use of these plates assumes that the user is not interested in other enteric pathogens such as Klebsiella or Escherichia . The plates contain various sugar sources ( lactose , sucrose , and salicin ), none of which can be used by either Shigella or Salmonella. However,
54-521: The 💕 [REDACTED] Look up HEA , hea , or hea' in Wiktionary, the free dictionary. HEA or Hea may refer to: Education [ edit ] Higher Education Academy , a British charity Higher Education Act of 1965 , United States Higher Education Act 2004 , United Kingdom Higher Education Authority , Republic of Ireland Science [ edit ] Hektoen enteric agar , used in microbiology to identify certain organisms High-entropy alloys ,
63-413: The medium also includes peptone which can be used as a carbon source. Since most bacteria can use the sugars in preference to peptone, these "uninteresting" bacteria acidify the medium and turn a pH indicator yellow or red. Peptone metabolism by Shigella and Salmonella alkalises the medium, turning a pH indicator blue. The presence of thiosulfate or ferric ammonium citrate in the medium produces
72-443: The title HEA . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=HEA&oldid=1220250004 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages HEA From Misplaced Pages,
81-469: The title HEA . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=HEA&oldid=1220250004 " Category : Disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Hektoen enteric agar The definitive use of HEA
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