  We report the kinetic analysis of free radicals on fungal spores of
Penicillium digitatum interacted with atomic oxygen generated plasma electric
discharge using real time in situ electron spin resonance (ESR) measurements.
We have obtained information that the ESR signal from the spores was observed
and preliminarily assignable to semiquinone radical with a g-value of around
2.004 and a line width of approximately 5G. The decay of the signal is possibly
linked to the inactivation of the fungal spore. The real-time in situ ESR has
proven to be a useful method to elucidate plasma-induced surface reactions on
biological specimens.
