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Principle of MacConkey Agar. MacConkey agar is used for the isolation of gram-negative enteric bacteria and the differentiation of lactose fermenting from lactose non-fermenting gram-negative bacteria.
Published on Sep 26, 2012. This video provides photos and narrator interpretation of MacConkey's Agar (MAC) specialized bacterial growth medium. Examples of sterile MAC as well as plates with growth of Gram-negative lactose fermenting bacteria and non-lactose fermenting bacteria. Video by Tami (Guy) Port, Chief Executive Nerd at ScienceProfOnline.com.