Caffeine effects on E. coli Cells.
a Comparison of final cell density between untreated and caffeine treated (0.625 mg/mL) isolates of E. coli K12 wild-type and recA-, uvrA-, and umuC-mutants. b Represents the growth rate of recA-bacterial cells treated with caffeine alone, as compared to an untreated control. c Growth curve of uvrA-bacterial cells treated with 0.625 mg/mL caffeine alone, as compared to untreated control. d Growth curve of untreated umuC-mutants compared with cells treated with 0.625 mg/mL caffeine.