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204:-resistant organism will have its own specific D-value. Determining a D-value requires an experiment, but only gives the D-value under the specific conditions of that experiment. D-values are unique to the conditions of the environment that the bacteria currently exists in.
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In the context of thermal analysis it is typical practice to subscript the "D" with an indication of temperature. For example, given a hypothetical organism which is reduced by 90% after exposure to temperatures of
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328:"Validation of a nut muffin baking process and thermal resistance characterization of a 7-serovar Salmonella inoculum in batter when introduced via flour or walnuts"
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Channaiah, Lakshmikantha H.; Michael, Minto; Acuff, Jennifer C.; Lopez, Keyla; Phebus, Randall K.; Thippareddi, Harshavardhan; Milliken, George (2019-04-02).
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157:. A D-value is denoted with the capital letter "D". Thus, after an exposure time of 1 D, only 10% of the organisms originally present in a
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of radioactive substances, however a half life involves a reduction of 50% rather than 90%. The half life is actually roughly 30% (
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may be given elsewhere. A numeric subscript may also be used to indicate some other level of reduction than 90%; for example, D
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Use of D-values is based on the assumption that the procedure in question causes the number of living microorganisms to
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analysis; however, it now has analogous uses in other microbial resistance and death rate applications, such as for
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Priscila Gava
Mazzola, Thereza Christina Vessoni Penna, Alzira M da S Martins (17 October 2003).
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stands for the temperature), where specific values for
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