Media sold in screw cap test tubes. FTM Fluid Thioglycollate Medium conforms with specifications of the USP. This medium is used for sterility testing of biologicals, as well as the cultivation of anaerobes, aerobes and microaerophiles. TSB Tryptic Soy Broth conforms with USP. This medium is used in qualitative procedures for the cultivation of fastidious and nonfastidious microorganisms.