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Amyl Media Amyl Media : Microbiological Media Supplies

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MRS medium was produced primarily for the growth of Lactobacilli.

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The formula for MRS was developed by deMan, Rogosa and Sharpe, based on earlier work by Rogosa to provide an alternative culture medium to Tomato Juice Agar which is an inconsistent product difficult to standardise batch to batch, and also because MRS medium is more successful in the cultivation of the slower growing Lactobacilli for example L. fermentum and L. brevis.

Other lactic acid fermenting genera: Streptococcus, Pediococcus and Leuconostoc with similar properties to Lactobacillus in terms of being oxidase and catalase negative and Gram stain positive are also supported.

Colony size on agar is enhanced by micro-aerophilic conditions but layer plates may be used for aerobic cultivation.

Most Lactobacilli are slow growing and require 2-4 days incubation.

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