Abstract
There are many toxic compounds in the environment. It has already reported that various compounds, such as benzene, chlorobenzene(CB), chlorophenols(CP), chloroform, are decomposed by ultrasonic irradiation. It is important to investigate the effects of sonolytic products of them on the environmental microorganisms. In this study, the growth activity of yeast cells or E-coli cells in the growth media containing those compounds was measured by calorimetric analysis. Calorimetric analysis can provide not only the quantitative information for the microbial growth activity but also the characteristic features about the bactericidal and bacteriostatic effect of the chemicals on the microbial cells. The g(t) curves obtained from yeast cells or E-coli cells showed that chlorobenzene and o-chlorophenol did not affect the cell growths significantly. In addition, it was shown that ultrasonic irradiation (27.5kHz, 77W) had synergistic effect on inactivation of yeast cells by NaClO suggesting that ultrasonic irradiation would cause the membrane damage on yeast cells increasing permeability of the chemicals.
