[microbiology] In microbiology, D-value refers to decimal reduction time and is the time required at a certain temperature to kill 90% of the organisms being studied. Thus after a colony is reduced by 1 D, only 10% of the original organisms remain, i.e., the population number has been reduced by one decimal place in the counting scheme. Gen...
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http://en.wikipedia.org/wiki/D-value_(microbiology)
[transport] In transport, D-value is a rating in kN that is typically attributed to mechanical couplings, and reflects dynamic loading limits between a towing vehicle and a trailer. The corresponding formula for a truck and trailer combination, used to determine the required D-value of a coupling, is: T = Weight of towing vehicle including ...
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http://en.wikipedia.org/wiki/D-value_(transport)
Time required to destroy 90% of cells under specified conditions
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http://www.dyerlabs.com/glossary/microbiology/2w-x-y-z.html
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