FIGURE 4.

UV-B resistance test by drop assays of the individual predicted ORFs involved in perchlorate resistance and their complete clones. Cultures were grown overnight at 37°C, drops of 4-fold serial dilutions were plated on LB-Ap and plates were incubated for 24 h after exposure to 20 s of UV-B (312 nm) radiation at 2 W m^–2.