Abstract
Macroplasmodia of the acellular slime mould Physarum polycephalum show oscillating electrical phenomena correlated with periodic protoplasmic shuttle-streaming activity (1). This could be demonstrated by external measurements with microelectrodes performed on specimens which were electrically isolated by the application of fluorinert liquids (FC 43, FC 70 and FC 77 from 3 M-Company, Hilden). FLuorinert liquids are clear, colourless and non-toxic. Light and electron microscopic investigations have shown that the liquids cause no serious structural changes in slime moulds. Single veins of Physarum (see figure) survive in fluorinert liquid for several hours without essential changes in shuttle-streaming and contractile activity.
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