D-value

(redirected from Decimal reduction time)

D-value

i. The difference between the actual height of a certain pressure surface over sea level and the height of the same pressure surface of the International Standard Atmosphere. It is the difference between the reading of a radio altimeter and a pressure altimeter while flying over the sea. Also known as a D-factor.
ii. The amount (positive or negative) by which the altitude (Z) of a point on an isobaric surface differs from the altitude (ZP) of the same isobaric surface in the ICAO Standard Atmosphere (i.e., D-value = Z—Zp) (ICAO).
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Decimal reduction time values--the time required at a certain temperature to kill 90% of the target organisms--were in the range of 2.
The D10 values--the decimal reduction time, the time required at a certain temperature to kill 90% of an organism--were calculated as a negative reciprocal of the slope of the survivor curves and were reported as mean values plus or minus standard deviation.