Fig 3.
Survival curves to UV treatments at different temperatures of stationary-phase cells of Salmonella Typhimurium STCC 878. Treatments were carried out in McIlvaine buffer adjusted to a pH of 7.0, with an absorption coefficient of 23.66 cm−1 at 25.0°C (■), 50.0°C (●), 52.5°C (▲), 55°C (□), 57.5°C (○), and 60.0°C (△). The UV reactors were submerged in a tempered 90-liter water bath (temperature, ±1.5°C) heated by the circulating water of a peripheral thermostatic bath. Two thermocouples, located at the input of the first reactor and at the outlet of the last reactor, allowed the treatment temperature to be controlled. The figure demonstrates that the shoulder length decreases and the inactivation rate increases with temperature.