Ionizing radiation may be used to kill MO in chickens, pork and medical supplies. Ideal disinfectant, ratings of germicides. Phenols are used when there is a large amount of organic matter present. Addition of methyl groups making cresol - making it more effective. Adding soap to cresol makes it lysol.
Chlorine also increases efficiency.
Use dilution test - Bacteria and disinfectant are mixed in broth. Iodine - tincture of iodine is reactive to the skin. Iodophores, such as betadine and isodine are less reactive. Oligodynamic action - antibacterial activities of heavy metals. Surfactants reduce surface tension, makes disinfectants mor efficient.