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Evidence for a specific microwave radiation effect on the green fluorescent protein.

Biophysical journal · 2006 · Mixed · Low evidence

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MixedLow evidencePaper 6443

An 8.5 GHz near-field microwave applicator (250 mW input power) and conventional heating both decreased GFP fluorescence intensity and produced a red-shift in the fluorescence spectrum. The authors report that the microwave-induced fluorescence changes could …

Study snapshot

PublicationBiophysical journal · 2006
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

We have compared the effect of microwave irradiation and of conventional heating on the fluorescence of solution-based green fluorescent protein. A specialized near-field 8.5 GHz microwave applicator operating at 250 mW input microwave power was used. The solution temperature, the intensity, and the spectrum of the green fluorescent protein fluorescence 1), under microwave irradiation and 2), under conventional heating, were measured. In both cases the fluorescence intensity decreases and the spectrum becomes red-shifted. Although the microwave irradiation heats the solution, the microwave-induced changes in fluorescence cannot be explained by heating alone. Several possible scenarios are discussed.

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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 typein_vitro
Effect directionmixed
PopulationNot supplied
Sample sizeNot supplied
Exposuremicrowave · 8500 MHz
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

An 8.5 GHz near-field microwave applicator (250 mW input power) and conventional heating both decreased GFP fluorescence intensity and produced a red-shift in the fluorescence spectrum. The authors report that the microwave-induced fluorescence changes could not be explained by heating alone.

Outcomes measured

  • Green fluorescent protein (GFP) fluorescence intensity
  • GFP fluorescence spectrum shift (red-shift)
  • Solution temperature

Limitations

  • No sample size reported in abstract
  • Exposure duration not reported in abstract
  • No SAR or dosimetry beyond input power reported in abstract
  • Mechanism described as uncertain ("several possible scenarios")
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 8500,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Green fluorescent protein (GFP) fluorescence intensity",
    "GFP fluorescence spectrum shift (red-shift)",
    "Solution temperature"
  ],
  "main_findings": "An 8.5 GHz near-field microwave applicator (250 mW input power) and conventional heating both decreased GFP fluorescence intensity and produced a red-shift in the fluorescence spectrum. The authors report that the microwave-induced fluorescence changes could not be explained by heating alone.",
  "effect_direction": "mixed",
  "limitations": [
    "No sample size reported in abstract",
    "Exposure duration not reported in abstract",
    "No SAR or dosimetry beyond input power reported in abstract",
    "Mechanism described as uncertain (\"several possible scenarios\")"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave irradiation",
    "8.5 GHz",
    "near-field applicator",
    "green fluorescent protein",
    "fluorescence intensity",
    "red-shift",
    "thermal vs non-thermal effects"
  ],
  "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: 10.1529/biophysj.106.084111
PubMed: 16731554

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