Physical Methods of Microbial Control 。Heat Thermal death point (TDP):Lowest temperature at which all cells in a culture are killed in 10 min. Thermal death time (TDT):Time to kill all cells in a culture Decimal reduction time(DRT):Minutes to kill 90%of a population at a given temperature• Heat • Thermal death point (TDP): Lowest temperature at which all cells in a culture are killed in 10 min. • Thermal death time (TDT): Time to kill all cells in a culture • Decimal reduction time (DRT): Minutes to kill 90% of a population at a given temperature Physical Methods of Microbial Control