The Increased Passive Efflux of Sodium and Rubidium from Rabbit Erythrocytes by Microwave Radiation

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Abstract
The passive efflux rates of 22Na and 86Rb from the red cells of male New Zealand white rabbits were measured in vitro after 1 h irradiations at 2.45 GHz. The temperature of the samples and the power absorbed were controlled. Arrhenius plots of measurements made in the absence of radiation exposure revealed the Na and Rb efflux have 4 separate linear regions with transitions at 8-13, 22.5 and 36.degree. C. The efflux rates with microwave exposure were identical to the control rates, except at the critical tempeatures, where irradiation increased the efflux of both cations. This response was examined at the 22.5.degree. C transition at 3 specific absorption rates (100, 190 and 390 mW/g). At all 3 levels, the cation efflux was statistically greater than predicted from a strictly thermal response. The response does not increase monotonically as a function of absorbed power. Similar increased cation efflux was observed near the 36.degree. C and 8-13.degree. C transitions. Possible mechanisms for this effect are discussed.

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