Search for ion‐cyclotron resonance in an Na+‐transport system

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Abstract
Colonic tissue from the turtle (Pseudemys scripta) was exposed in a Ussing chamber to simultaneously applied static and time‐varying magnetic fields. Transepithelial differences of potential were monitored as frequency of the AC field was varied continuously or in discrete steps from 3 to 770 Hz. Density of the DC field was varied from 10 to 220 μT and that of the AC field from 1 to 20 μT. Short‐circuit currents through tissue were monitored for changes that might have been observed under ion‐cyclotron resonance (ICR) conditions for each of several ions: H+, Li+, Na+, K+, Ca2+, and Cl−. No discernible changes of transepithelial current were observed. The negative findings are discussed in relation to positive and negative findings that have appeared in the literature.