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Using neutral red pH indicator, the agar distinguishes those Gram-negative bacteria that can ferment the sugar lactose (Lac+) from those that cannot (Lac-)fermentation. This medium is also known as an indicator medium and a low selective medium. Presence of bile salts inhibits swarming by Proteus species.
Definition of lactose. : a disaccharide sugar C12H22O11 that is present in milk and yields glucose and galactose upon hydrolysis and yields especially lactic acid upon fermentation.