Symbiosis, Lab Experiments in Microbiology
Symbiosis, Lab Experiments in Microbiology
12th Edition
ISBN: 9781256549567
Author: Johnson
Publisher: Pearson Custom Publishing
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Chapter 48, Problem 1CT
Summary Introduction

To analyze:

The colourless colony isolated on MacConkey agar is Salmonella or Shigella

Introduction:

MacConkey agar acts as a differential medium for lactose fermenting bacterium and non-lactose fermenting bacterium. If the agar retains the red colour and the colonies are opaque, then they are lactose fermenters and if the agar is colourless and the colonies are translucent, then they are non-lactose fermenters.

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