Figure 1

Viable cell count growth curves. Overnight cultures were diluted 1:20 in fresh M-9 minimal medium and grown at 37°C. After 1.5 hours of growth, selenite or water was added to each culture. Samples were diluted and spread on plates containing LB medium every 45 minutes. Values at each time point are the average of at least 3 different experiments, and error was calculated using the student t test at a 95% confidence level.