This is a differential medium. It tests the ability of an organism to do several things: reduce sulfur, produce indole and swim through the agar (be motile). SIM is commonly used to differentiate ...

This medium is both selective and differential ... form bright pinky-red colonies (plate pictured on the left here). MacConkey agar is commonly used to differentiate between the Enterobacteriaceae.

Agar is an NFL and college football nationwide correspondent and host with Bally Sports in Chicago, but she is best known as ...