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Transbilayer movement of 24Na in sonicated phosphatidylcholine vesicles exposed to frequency-modulated microwave radiation.

Bioelectromagnetics · 1981 · No effect · Low evidence

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No effectLow evidencePaper 6026

Sonicated egg phosphatidylcholine vesicles loaded with 24Na+ were exposed to frequency-modulated microwaves (3 Hz) in the 2350–2550 MHz range at 20 mW, or to 2450 MHz continuous-wave microwaves at 80 mW. Leakage of 24Na+ measured for up to 19 hours showed no …

Study snapshot

PublicationBioelectromagnetics · 1981
Study typein_vitro
Reported directionNo effect
Evidence ratingLow

Abstract

Sonicated egg phosphatidylcholine vesicles loaded with 24Na+ were exposed at 20mW to a frequency-modulated (3 Hz) microwave field in the range of 2350 to 2550 MHz, or at 80 mW to a 2450-MHz CW (continuous wave) field, in a waveguide. The vesicle suspension absorbed microwaves at about 1 mW/ml and 25 mW/ml (CW experiment). The average temperature change of the irradiated suspension was less than 0.1 degree C from ambient. Leakage of 24Na+ from the vesicles for up to 19 hours was measured. No difference was noted in the movement of 24Na+ from the vesicles in the irradiated and control dispersions.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro
Effect directionno_effect
PopulationNot supplied
Sample sizeNot supplied
Exposuremicrowave · 2450 MHz · up to 19 hours
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Sonicated egg phosphatidylcholine vesicles loaded with 24Na+ were exposed to frequency-modulated microwaves (3 Hz) in the 2350–2550 MHz range at 20 mW, or to 2450 MHz continuous-wave microwaves at 80 mW. Leakage of 24Na+ measured for up to 19 hours showed no difference between irradiated and control dispersions; reported average temperature change was <0.1°C.

Outcomes measured

  • Transbilayer movement/leakage of 24Na+ from sonicated egg phosphatidylcholine vesicles

Limitations

  • Sample size not reported in abstract.
  • Exposure metrics reported as incident power and absorbed power per volume; SAR not provided.
  • In vitro vesicle model; generalizability to biological tissues not addressed in abstract.
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": null,
    "duration": "up to 19 hours"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Transbilayer movement/leakage of 24Na+ from sonicated egg phosphatidylcholine vesicles"
  ],
  "main_findings": "Sonicated egg phosphatidylcholine vesicles loaded with 24Na+ were exposed to frequency-modulated microwaves (3 Hz) in the 2350–2550 MHz range at 20 mW, or to 2450 MHz continuous-wave microwaves at 80 mW. Leakage of 24Na+ measured for up to 19 hours showed no difference between irradiated and control dispersions; reported average temperature change was <0.1°C.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract.",
    "Exposure metrics reported as incident power and absorbed power per volume; SAR not provided.",
    "In vitro vesicle model; generalizability to biological tissues not addressed in abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "frequency-modulated",
    "continuous wave",
    "2450 MHz",
    "2350–2550 MHz",
    "phosphatidylcholine vesicles",
    "24Na",
    "leakage",
    "waveguide",
    "temperature change"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1002/bem.2250020303
PubMed: 7306218

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