Plate count agar/broth for heterotrophic plate counts

Rocky Baker bakerr at
Thu Jan 23 15:51:16 EST 1997

Why does m-TGY broth (tryptone, glucose, yeast extract) for membrane 
filtration have twice the concentration of components as the equivalent 
Plate Count Agar.  Since you can lay a membrane on either an agar surface 
or a pad wetted with broth, it doesn't make sense to me that the broth 
would be twice as concentrated.


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