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. 2014 Mar 3;9(3):e90422. doi: 10.1371/journal.pone.0090422

Table 2. Summary of the growth kinetics of exponential phase E. coli O157∶H7 Sakai subjected to a sudden downshift in water activity from aw 0.993 to aw 0.980, 0.975, 0.970, 0.967 and 0.960, as determined by viable count.

Relative lag time (RLT)
Water activity downshift Generation time, GT (h) Lag time, LT (h)a Adaptation time, AT (h)b LT/GT AT/GT
aw 0.980 0.45 0.69 0.68 1.53 1.51
aw 0.975 0.67 1.55 0.94 2.31 1.40
aw 0.970 0.73 2.04 1.27 2.79 1.74
aw 0.967 1.41 4.74 1.53 3.36 1.09
aw 0.960 1.68 10.57 2.13 6.29 1.27
a

Lag time is calculated by linear regression as the time taken to increase above starting numbers.

b

Adaptation time is estimated visually as the time taken for cells to resume exponential growth.