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Representative bioluminescent emission profiles recorded from P. putida TVA8 bioreporter cells encapsulated in silica hydrogel on the optical fiber after consecutive daily exposures to toluene at 5.3 mg/L over a total of 24 days (fiber 1) (cps; counts/s). (a) days 1–7; (b) days 8–14; (c) days 15–24.
