Figure 5.

Survival of Bacillus subtilis endospores after exposure of Mars surrogate soil to the sterilizing radiation of UV. Each data point represents the mean of three replicate experiments. Error bars represent +/- one standard deviation of the three replicates. CFU = colony-forming units. The X-axis shows the depth range (mm) of the sample taken for viable counts after 96 hours of exposure to UV light.

Crawford et al. BMC Microbiology 2003 3:4   doi:10.1186/1471-2180-3-4
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