This HiDip slide is recommended for total bacterial count and isolation of yeast & moulds. Plate Count Agar (PCA) : Recommended for determination of plate counts of microorganisms in food, water, waste water & clinical . Also called as Standard Methods Agar. It is recommended by APHA and FDA for determination of counts. Malt extract medium : Recommended for isolation of yeasts and moulds. Malt extract serves as energy source.