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Antibody responses of mice exposed to low-power microwaves under combined, pulse-and-amplitude modulation

Bioelectromagnetics · 1991 · Mixed · Low evidence

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MixedLow evidencePaper 6670

Mice were exposed to pulsed microwaves (9.4 GHz; 1 microsecond pulses at 1,000/s) with or without concurrent amplitude modulation (14–41 MHz). Without amplitude modulation, the pulsed field did not greatly alter immune responsiveness; with combined pulse-and-…

Study snapshot

PublicationBioelectromagnetics · 1991
Study typeanimal
Reported directionMixed
Evidence ratingLow

Abstract

Irradiation by pulsed microwaves (9.4 GHz, 1 microsecond pulses at 1,000/s), both with and without concurrent amplitude modulation (AM) by a sinusoid at discrete frequencies between 14 and 41 MHz, was assessed for effects on the immune system of Balb/C mice. The mice were immunized either by sheep red blood cells (SRBC) or by glutaric-anhydride conjugated bovine serum albumin (GA-BSA), then exposed to the microwaves at a low rms power density (30 microW/cm2; whole-body-averaged SAR approximately 0.015 W/kg). Sham exposure or microwave irradiation took place during each of five contiguous days, 10 h/day. The antibody response was evaluated by the plaque-forming cell assay (SRBC experiment) or by the titration of IgM and IgG antibodies (GA-BSA experiment). In the absence of AM, the pulsed field did not greatly alter immune responsiveness. In contrast, exposure to the field under the combined-modulation condition resulted in significant, AM-frequency-dependent augmentation or weakening of immune responses.

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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 typeanimal
Effect directionmixed
PopulationBalb/C mice
Sample sizeNot supplied
Exposuremicrowave · 9400 MHz · 0.015 W/kg · 5 contiguous days, 10 h/day
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Mice were exposed to pulsed microwaves (9.4 GHz; 1 microsecond pulses at 1,000/s) with or without concurrent amplitude modulation (14–41 MHz). Without amplitude modulation, the pulsed field did not greatly alter immune responsiveness; with combined pulse-and-amplitude modulation, immune responses showed significant AM-frequency-dependent augmentation or weakening.

Outcomes measured

  • Antibody response (plaque-forming cell assay)
  • IgM antibody titers
  • IgG antibody titers
  • Immune responsiveness

Limitations

  • Sample size not reported in abstract
  • Details of randomization/blinding not reported in abstract
  • Only short-term exposure (5 days) described in abstract
  • Results described qualitatively; effect sizes not provided in abstract
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 9400,
    "sar_wkg": 0.015,
    "duration": "5 contiguous days, 10 h/day"
  },
  "population": "Balb/C mice",
  "sample_size": null,
  "outcomes": [
    "Antibody response (plaque-forming cell assay)",
    "IgM antibody titers",
    "IgG antibody titers",
    "Immune responsiveness"
  ],
  "main_findings": "Mice were exposed to pulsed microwaves (9.4 GHz; 1 microsecond pulses at 1,000/s) with or without concurrent amplitude modulation (14–41 MHz). Without amplitude modulation, the pulsed field did not greatly alter immune responsiveness; with combined pulse-and-amplitude modulation, immune responses showed significant AM-frequency-dependent augmentation or weakening.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "Details of randomization/blinding not reported in abstract",
    "Only short-term exposure (5 days) described in abstract",
    "Results described qualitatively; effect sizes not provided in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwaves",
    "pulsed microwaves",
    "amplitude modulation",
    "immune system",
    "antibody response",
    "Balb/C mice",
    "SAR",
    "plaque-forming cell assay",
    "IgM",
    "IgG"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.25,
      "reason": "Animal study of RF/microwave exposure with SAR reported; potentially relevant to exposure guideline discussions."
    }
  ]
}
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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.2250120107
PubMed: 2012621

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