Thus organisms capable of lactose fermentation such as Escherichia coli, form bright pinky-red colonies (plate pictured on the left here). MacConkey agar is commonly used to differentiate between the ...

Agar is a natural polysaccharide extracted from red algae, primarily species of the genera Gelidium and Gracilaria. Agar is composed of two primary components: agarose and agaropectin. It is widely ...