Fig 3.

DNA degradation following copper surface exposure. E. coli strain ATCC 23724 was grown, harvested, and resuspended in 0.85% NaCl and exposed to coupon surfaces of the indicated alloy as described for Fig. 2. At the indicated times, the cells were washed from the coupon surface with 100 μl of 0.85% NaCl, total DNA was isolated using the Promega Wizard SV genomic DNA purification system, and the DNA was size separated in a 1% agarose gel. The size markers (M) are HindIII-digested λ phage DNA.