Fig 3.

Quantification of thermotolerance developed in the EcB strain. Synechococcus WT (○), EcB (▪), and ΔclpB1 (▵) cultures grown at 37°C were either directly shifted to 54°C for 15 minutes (A) or first preheated at 48.5°C for 1.5 hours before the shift to 54°C for 15 minutes (B). Average numbers of viable cells after each temperature treatment are expressed as percentages of the value for the 37°C control (100%). All values are averages ± SE for 3 independent experiments