Fig. (3) Effect on total ATP production (nM) by B. cereus (a) and S. aureus (b) in MHB exposed to NPBD (µg/mL). ATP (―) and viable cell numbers (- - -) were measured at each time point by the BacTitre-Glo™ ATP assay and viable counts respectively. B. cereus exposed to 0 (×), 16 µg/mL (■) and 32 µg/mL (▲) NPBD and S. aureus exposed to 0 (×), 8 µg/mL (■) and 32 µg/mL(▲) NPBD. Regression analysis of ATP production and CFU/mL for increasing treatment concentrations gave R2 values of 0.94, 0.75 and 0.91 for B. subtilis respectively; and R2 values of 0.79, 0.74 and 0.67 for C. albicans respectively.