The difference between plate counting agar and nutrient agar. Why is plate counting agar used in the national standard?

1. Plate counting agar medium, PCA, is used to determine the total number of colonies in the 08 edition GB. Formula: tryptone 0.5%, yeast extract 0.25%, glucose 0.1%, agar 1.5% , prepared with distilled water. pH 6.7.2.2, nutrient agar medium is NA. Formula: 1% peptone, 0.3% beef extract, 0.5% sodium chloride, 1.5%~2 agar...

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