Heat(terms) TDP: the lowest temperature at which a microbial suspension is killed in 10 minutes TDT: the shortest time needed to kill all organisms in a microbial suspension at a specific temperature and under defined conditions Decimal reduction time (D)or D value: the time required to kill 90% of the microorganisms or spores in a sample at a specified temperature. D121Heat(terms) • TDP: the lowest temperature at which a microbial suspension is killed in 10 minutes. • TDT: the shortest time needed to kill all organisms in a microbial suspension at a specific temperature and under defined conditions. • Decimal reduction time (D) or D value: the time required to kill 90% of the microorganisms or spores in a sample at a specified temperature. D121