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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 LAC. : a resinous substance secreted by a scale insect (Laccifer lacca) and used chiefly in the form of shellac. See lac defined for kids. ADVERTISEMENT. a resinous substance secreted by a scale insect (Laccifer lacca) and used chiefly in the form of shellac. See lac defined for kids.