Transient Effects of Low-Level Microwave Irradiation on Bioelectric Muscle Cell Properties and on Water Permeability and Its Distribution

Portela, A.; Llobera, O H; Michaelson, Sol M.; Stewart, Peter A.; González, J. C.; Guerrero, Ariel H.; Rodriguez, Carlos A.; Perez, Roberto J.

doi:10.1007/978-1-4684-0760-0_5

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Because single exposures of isolated muscle fibers for a longer (120-min) period does reversibly alter cellular function, especially that of the "winter" frog [cf. Portela et al, 1973Portela et al, , 1975a, our results on the "late summer" frog are…”

Section: Discussionmentioning

confidence: 53%

“…The uncertainty in estimating P• by this method is generally less than 0.03 Pw units. In order for these calculations to be valid, the increase in volume must occur at constant length, as discussed in Portela et al [1971Portela et al [ , 1974Portela et al [ , 1975a. Careful procedures were used in this work to ensure that this condition was always satisfied [see also Mauro and Adams, 1961;Street and Ramsay, 1965;Bendall, 1969].…”

Section: If Vw ø and C• Are The Initial Values Of Srs For Cell-watermentioning

confidence: 99%

“…Following the procedure of previous studies [Portela et al, 1971[Portela et al, , 1974[Portela et al, , 1975a both tibialis anticus muscles were dissected from each frog at time of killing, and a single-cell (fiber) preparation was made from each muscle. The single fiber was mounted in a special perfusing chamber, to permit rapid changes in the bathing solution.…”

Section: Muscle-cell Preparation and Bathing Solutionsmentioning

confidence: 99%

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

Portela¹,

Guardado²,

Oro³

et al. 1979

Radio Science

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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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Section: Discussionmentioning

confidence: 53%

Section: If Vw ø and C• Are The Initial Values Of Srs For Cell-watermentioning

confidence: 99%

Section: Muscle-cell Preparation and Bathing Solutionsmentioning

confidence: 99%

See 1 more Smart Citation

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

Portela¹,

Guardado²,

Oro³

et al. 1979

Radio Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Heating effects may not be clearly eliminated, or, as in the case of neuronal firing rate, the change in the rate may occur only in a minority of cases (Seaman and Wachtel, 1978). Portela et al (1975) studied the effect of 2.88-GHz pulsed microwaves on passive and dynamic electrical properties and on cell water parameters in frog muscle. They concluded that 120 min exposure at 10 mW/cm 2 did not produce permanent effects on electrical and cell water parameters.…”

Section: In Vitro Studiesmentioning

confidence: 99%

Biological Effects and Health Implications of Radiofrequency Radiation

Michaelson¹,

Lin²

1987

142

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The effect of pulsed microwaves on passive electrical properties and interspike intervals of snail neurons

Field

Ginsburg

Lin

1993

Bioelectromagnetics

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The effects of pulsed microwaves (2.45 GHz, 10 microseconds, 100 pps, SAR: 81.5 kW/kg peak, 81.5 W/kg average) on membrane input resistance and action potential (AP) interval statistics were studied in spontaneously active ganglion neurons of land snails (Helix aspersa), at strictly constant temperature (20.8 +/- .07 degrees C worst case). Statistical comparison with sham-irradiated neurons revealed a significant increase in the mean input resistance of neurons exposed to pulsed microwaves (P < or = .05). Pulsed microwaves had no visible effect on mean AP firing rate; this observation was confirmed by analysis of interspike intervals (ISIs). Using an integrator model for spontaneously active neurons, we found the net input current to be more variable in neurons exposed to pulsed microwaves. The mean input current was not affected. The standard deviation of ISIs and the autocorrelation of the input current were marginally affected, but these changes were not consistent across neurons. Although the observed effects were less obvious than those reported in other studies, they represent evidence of a direct interaction between neurons and pulsed microwaves, in the absence of macroscopic temperature changes. The data do not suggest a single, specific mechanism for such interaction.

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Transient Effects of Low-Level Microwave Irradiation on Bioelectric Muscle Cell Properties and on Water Permeability and Its Distribution

Cited by 7 publications

References 24 publications

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

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

Biological Effects and Health Implications of Radiofrequency Radiation

The effect of pulsed microwaves on passive electrical properties and interspike intervals of snail neurons

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