Cellular spin resonance of yeast in a frequency range up to 140 MHz.

Rotation of living and dead yeast cells with and without buds was examined in rotating electric fields through a frequency range of 90 Hz to 140 MHz. For living yeast maximum rotation was observed in co-field direction at 30 MHz as predicted from model calculations, but with an unexpected sharp second resonance at 80 MHz for nonbudding cells. Also in the high frequency range the rotation rate was found to be proportional to the square of the applied field strength. The resonance of dead cells lies at 4 MHz; at lower frequencies these cells spin against the field analog to living cells, but without any resonance.