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Agar-agar, usually seen abbreviated as agar, is a gelatinous substance derived from certain types of red algae, or seaweed. There are a number of uses for it, although most people are familiar with it as the culture medium in petri dishes.gar is derived from certain types of red algae. Agar and bacteria in a petri dish. Agar has a number of uses in the fields of microbiology and chemistry. Agar is used to make gelatinous foods like gummy bears.
MacConkey Agar. This is an agar upon which only Gram-negative bacteria can grow. What is more is that E.coli will grow into red colonies, as there is a pH indicator present. It should be mentioned that MacConkey agar powder comes in two versions: one with the sugar lactose in it, and one without any added sugars.gar is a phycocolloid extracted from a group of red-purple marine algae (Class Rhodophyceae) including Gelidium, Pterocladia and Gracilaria. Gelidium is the preferred source for agars. Impurities, debris, minerals and pigment are reduced to specified levels during manufacture.