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Table 3 Fitness of promoter mutants is greater than ancestor at 42°C*.

From: Positive selection at high temperature reduces gene transcription in the bacteriophage ϕX174

Temperature Host F-test Pr > F t-value Pr > |t|
37° Escherichia coli 41.4 <0.0001 6.7 <0.0001
37° Salmonella typhimurium 10.6 0.0013 -4.6 0.0010
37° Shigella sonnei 70.6 <0.0001 11.3 <0.0001
42° Escherichia coli 35.4 <0.0001 -8.6 <0.0001
42° Salmonella typhimurium 14.8 0.0003 -6.6 <0.0001
42° Shigella sonnei 53.2 <0.0001 -13.9 <0.0001
  1. *ANOVA on doublings per hour for each environmental condition with 4 degrees of freedom for each test, and t-test comparing ancestor to all mutants.