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Fluorescence intensity change for (A) E. coli and (C) B. subtilis as a function of UV irradiation time. The change of the peak fluorescence intensity at 340 nm and 350 nm is shown in B and D for E. coli and B. subtilis, respectively. The number of live E. coli as a function of UV irradiation time is also shown in B and is labeled by the right axis.
