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An assessment of ultrasonic radiation hazard using yeast genetic systems.

Abstract To assess possible genetic effects of ultrasonic radiation, four different genetic systems have been established using yeast cells. The systems were especially chosen to minimize the chance of overlooking any damaging effects which might lead to hereditary change. Irradiation of the cells has been carried out at parameters similar to those used in medical applications of ultrasound (diagnosis and physiotherapy) and under more extreme (cavitational) conditions. None of these treatments showed an effect upon mutant or recombinant frequency in the yeast systems. Similarly, efforts to show any delayed or cryptic effects of ultrasonic irradiations, and to show a genetic component in lethality caused by ultrasound, were negative. Only under conditions allowing a build-up of the secondary effects of heating or peroxide formation was an effect found, in the system assaying for genetic loss of mitochondrial DNA function (respiratory deficiency). Thus, on this evidence, there seems to be only a small chanc...