This medium is both selective and differential. The selective ingredients are the bile salts and the dye, crystal violet which inhibit the growth of Gram-positive bacteria. The differential ingredient ...

The Journal of Infectious Diseases, Vol. 29, No. 4 (Oct., 1921), pp. 390-407 (18 pages) In agar culture mediums containing 0.1% agar, the gel, composed of colloidal particles in a state of equilibrium ...