Zwietering M H, Rombouts F M, van 't Riet K
Department of Food Science, Wageningen Agricultural University, The Netherlands.
J Appl Bacteriol. 1992 Feb;72(2):139-45. doi: 10.1111/j.1365-2672.1992.tb01815.x.
Different definitions for the lag time and of the duration of the exponential phase can be used to calculate these quantities from growth models. The conventional definitions were compared with newly proposed definitions. It appeared to be possible to derive values for the lag time and the duration of the exponential phase from the growth models and differences between the various definitions could be quantified. All the different values can be calculated from the growth parameters microm, lambda and alpha. Therefore, it appeared to be unnecessary to use complicated mathematical equations; simple equations were adequate. For the Gompertz model the conventional definition of the lag time did not differ appreciably from the newly proposed definition. The end-point of the exponential phase and thus the duration of the exponential phase differed considerably for the two definitions. For the logistic model the two definitions lead to considerable differences for all quantities. It is recommended that the conventional definition is used for calculating the lag time. For the duration of the exponential phase it is recommended that the new definition is used. The value can be calculated, however, directly from the conventional growth parameters.
可以使用对延迟时间和指数期持续时间的不同定义，从生长模型中计算这些量。将传统定义与新提出的定义进行了比较。结果表明，从生长模型中得出延迟时间和指数期持续时间的值是可能的，并且可以量化各种定义之间的差异。所有不同的值都可以从生长参数μm、λ和α计算得出。因此，似乎没有必要使用复杂的数学方程；简单的方程就足够了。对于Gompertz模型，延迟时间的传统定义与新提出的定义没有明显差异。两种定义下指数期的终点以及指数期的持续时间有很大差异。对于逻辑模型，两种定义在所有量上都导致了相当大的差异。建议使用传统定义来计算延迟时间。对于指数期的持续时间，建议使用新定义。然而，该值可以直接从传统生长参数计算得出。
