CONTROL OF MICROORGANISMS BY PHYSICAL METHODS
- Hot Air Oven: It is used to sterilize glassware like pipettes, flasks, dry powder etc. It is operated at a temperature 160 c for 1 hours. The above figure shows a typical hot air oven.
- Flaming: Here Bunsen burner is used for few seconds to sterilize bacteriological loop before removing a sample from culture tubes & after preparing a smear. Flaming is also used to sterilize tips of tube & flasks, needles, forceps, & scalpels.
- Incineration: It is used for destruction of corpses, infected lab animal & other infected materials like hospital gowns, plastic apparatus. It is simply burning carried out either in incinerator or metal drums.