MacConkey agar is designed as a selective medium for coliforms, and tests for the ability to...
MacConkey agar is designed as a selective medium for coliforms, and tests for the ability to ferment lactose. What components in the agar indicate lactose fermentation?
Homework Answers
- MacConkey Agar is a selelctive media for Gram negative bacteria, specifically Enterobacteriaceae.
- This selectivity is facilitated by the presence of pancreatic digest of gelatin, proteoses peptones, mainly bile salts and crystal violet (which inhibit Gram positive bacteria)
- MacConkey Agar also acts as differential media and differentiates lactose fermenting bacteria from non-fermenting bacteria.
- Presence of lactose as carbohydrate source, help in such differentiation.
- Organisms that can ferment lactose will produce lactic acid.
- Neutral red is used as indicator, which is colorless at pH greater than 6.8 and turn red in lower pH of less than 6.8.
- Thus, if lactose is fermented, acid produced causes change in pH.
- Observation is as pink/red colonies for lactose fermenting bacteria.
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MacConkey agar is designed as a selective medium for coliforms,
and tests for the ability to...
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can somrone help me write an introduction for each agar. thank you
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I need help answering these questions Part 3: MacConkey agar and EMB agar Watch the following...
I need help answering these questions
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Background
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can somrone help me write an introduction for each agar. thank you
?
Introduction: Selective and differential media are used frequently in Microbiology Pathology Labs to identify a known group of bacteria from a complex mix of other bacteria. The medium is designed to select against as many of the background organisms as possible by using a medium in which they will not grow but the organisms under investigation can grow hence the "Selective" part of the name. Any assayable...
I need help answering these questions
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Ques part 1)
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