Dual nature of the intracellular cations. Conductance of adsorbed intracellular cations in the region of microwave frequencies.

The majority of intracellular ions was "invisible" by classical conductance measurements over the regions of audio and radio frequencies. In the microwave region all the cations become "visible" in muscles. A non-invasive method is found to determine the cationic content of biological tissues. The better the physical condition of the muscle the greater the new parameter, the invisible cationic conductivity. 15% of the total cation content is released by thermal treatment that was probably associated with negative phosphate or carboxylate groups of the lipoid surface of the membrane structure. This K+ fraction in the frog muscle has been already discovered by three quite different methods.