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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.
lac - resinlike substance secreted by certain lac insects; used in e.g. varnishes and sealing wax. seal, sealing wax - fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters. shellac varnish, shellac - a thin varnish made by dissolving lac in ethanol; used to finish wood. animal product - a product made from animal material.