An agar medium used for the laboratory growth and characterisation of yeasts. Wallerstein nutrient agar (WLN) contains bromomethyl green dye which may be taken up to different extents by different yeast strains so distinguishing their colonies. Wallerstein differential agar (WLD) also contains actinomycin, an antibiotic which inhibits yeast growth. WLD media is used to show the presence of bacteria in a beer or wort sample.

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