Abstract
Frogs (Rana pipiens) were exposed daily for six minutes to pulsed, 2.88‐GHz microwave radiation at an average power density of 10 mW cm−2 under controlled conditions in a calibrated anechoic chamber for periods of 20 to 100 days. Single‐fiber preparations of Tibialis anticus muscle were analyzed for osmotic responses, and the following quantities were determined: osmotically effective cell‐water fraction, Weff; cell‐membrane water permeability, Pw; Staverman's reflection coefficient (σ) for mannitol, sucrose, glycerol, urea, acetamide, ethylene glycol, and formamide; and equivalent pore radius of the membrane. No changes were detected in any of these endpoints as a consequence of repeated exposure to the radiation. Mean values found were: Weff = 0.50; Pw = 0.40 cm4 Osm−1 s−1; equivalent pore radius = 4 Å.
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