. . . "For example, to make the medium even more selective for Gram-negative bacteria, compounds such as bile salts, deoxycholate, sodium dodecyl sulfate. tergitol-4, tergitol-7, crystal violet, brilliant green, pyronin Y, bromate, bromide, tellurite, tetrathionate, sulfamandelate, cefixime, or other selective agents such as surface-active agents, dyes, inorganic compounds, antimicrobials, etc., can be i" . .