Radio Science

Quantitation of effects of repeated microwave radiation on muscle-cell osmotic state and membrane permselectivity


  • Adolfo Portela,

  • María Inés Guardado,

  • Juan R. de Xammar Oro,

  • Margarita Brennan,

  • Valentin Trainotti,

  • Peter A. Stewart,

  • Roberto J. Pérez,

  • Carlos Rodríguez,

  • Alvaro Gimeno,

  • Thomas C. Rozzell


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.