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Bioluminescence response of RM4440 after exposure to UV A and psoralen. (A) Total bioluminescence (nanoamperes). (B) Normalized bioluminescence (nanoamperes per CFU per milliliter). The biofilm beads were stirred in PMM containing psoralen. ■, UV A only; ●, psoralen only; ▴, ambient light and psoralen; ⧫, 8,000 J of UV A per m2 and psoralen; □, 16,000 J of UV A per m2 and psoralen.
