MacConkey agar


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Mac·Con·key a·gar

(mă-kon'kē),
medium containing peptone, lactose, bile salts, neutral red, and crystal violet, used to identify gram-negative bacilli and characterize them according to their status as lactose fermenters. Fermenters appear as pink colonies whereas nonfermenters are colorless.
Farlex Partner Medical Dictionary © Farlex 2012

MacConkey agar

A differential and selective growth medium used to isolate and identify gram-negative bacilli, often enteric pathogens, based on fermentation or lack of fermentation of a sugar added to the media. MA is peptone-based and contains bile salts and crystal violet (which inhibit the growth of gram-positive organisms), a sugar (usually lactose) and a pH indicator, allowing differentiation of lactose-fermenting (indicated by pink colonies, e.g., Escherichia coli) and non-lactose-fermenting (colourless colonies, e.g., Proteus mirabilis) bacteria.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Mac·Con·key agar

(mă-kongk'ē ā'gahr)
Medium containing peptone, lactose, bile salts, neutral red, and crystal violet; used to recover gram-negative bacilli and characterize them according to their ability to ferment lactose. Fermenters appear as red colonies, whereas nonfermenters are colorless.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

MacConkey,

Alfred Theodore, English bacteriologist, 1861-1931.
MacConkey agar - a medium used to identify gram-negative bacilli and characterize them according to their status as lactose fermenters. Synonym(s): MacConkey medium
MacConkey medium - Synonym(s): MacConkey agar
Medical Eponyms © Farlex 2012
References in periodicals archive ?
Bp1 Bp2 Characteristic 1997 2000 134 I parapertussis Growth 4 4 4 4 1 1 1 rate*(Days) Catalase + + + + + + + Oxidase + + + + - + + Nitrate - - - - - + - reductase Urease - - - - + - + Growth on Blood agar - - - - + - + MacConkey agar - - - - V - + Strain/lsolate Bp3 Bp4 Bp5 Bp6 Bp7 Bp8 Bp9 Bp10 Bp11 Characteristic Growth 4 1 5 1 5 5 5 1 1 rate*(Days) Catalase + + + + + + + + + Oxidase + + + + + + + + + Nitrate - - - - - - - - - reductase Urease - + - + - - - + + Growth on Blood agar - - - - - - - - - MacConkey agar - - - - - - - - - * Growth rate represents minimum days of appearance of colonies on BGA; Hp: Bordetella pertussis.
Nutrient agar was used to isolate non fastidious organisms; chocolate agar was for isolating fastidious organisms, while MacConkey agar was used to differentiate between lactose and non-lactose fermenting organisms.
coli O157:H7 isolation is plating of the specimen to a selective agar, such as MacConkey agar with sorbitol (SMAC).
Enterococci appear on MacConkey Agar No.2 as small, intensely coloured, red-purple colonies.
Each isolate was streaked for isolation onto MacConkey agar and incubated at 35[degrees]C for one to two days.
Non-lactose fermenting colonies were observed on MacConkey agar within 24 hours (Oxoid, England).
coli O157:H7 counts were determined on sorbitol MacConkey agar. The researchers found that at 21 days, there were 0.5 log, 3 log and 5.4 log decreases from the initial E.
coli enrichment broth and sorbitol MacConkey agar (SMAC), a selective medium used to screen for STEC serotype O157:H7 because this serotype, unlike most E.
In the second part of this experiment, 1 mL of each sample was placed onto a MacConkey agar plate and an antibiotic disk was placed in the center of each plate.
Blood culture bottles were incubated at 370 C and routinely subcultured after 24 hours in MacConkey agar and blood agar media.
coli O157:H7 appears as sorbitolnonfermented colonies on MacConkey agar (whitegray) as shown in Figure 1.