Abstract
The effect of continuous-wave and pulsed 2 MHz ultrasound at an intensity of 10 W/cm/sup 2/ on the mitotic index of Pisum sativum root meristems was investigated. The duty factor of the pulses was 1 on to 9 off, and the on times ranged from 1 min to 3 ..mu..sec. In all cases the total irradiation (''on'') time was 1 min. The ultrasound produced a reduction in the mitotic index at all pulse lengths. The shorter pulse lengths (3 and 10 ..mu..sec) were less effective in reducing mitotic index than were the longer pulse lengths. Acoustic cavitation is suggested as a mechanism partially causing this nonthermal effect. (auth)
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