FIG. 1.

Kinetic graph showing induction of bioluminescence as a function of time for grpE′::lux promoter fusion bacteria after exposure to 5 min of 1-MHz pulsed ultrasound (I_SPPA, 500 W cm⁻²). RLU are directly proportional to stress response. The sham-treated control was subjected to transport and all manipulations, as was the ultrasound-treated sample, without being subjected to the 1-MHz transducer. The untreated control was placed at 26°C and shaken but was not transported or placed in the apparatus.