Ultrasonic and sonic vibrations
Cells of all types can be destructed by intense sonic and ultrasonic vibrations generated by magnetostrictive oscillations or peizo electric crystals. It has limited practical significance for sterilization but valuable in instrument cleaning.
Filtration
It is a method of choice for heat labile liquids and solution. The various types of filters are candle filters, asbestos filters, sintered glass filter, membrane filters, nucleopore filters.