RF Safe

Are the conformational dynamics and the ligand binding properties of myoglobin affected by exposure to microwave radiation?

European biophysics journal : EBJ · 2003 · No effect · Low evidence

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No effectLow evidencePaper 6395

A myoglobin solution exposed to 1.95 GHz microwaves for 2.5 h at 51 mW/g SAR showed no influence of radiation on the native structural state based on absorption spectroscopy, circular dichroism, and fluorescence emission decay measurements.

Study snapshot

PublicationEuropean biophysics journal : EBJ · 2003
Study typein_vitro
Reported directionNo effect
Evidence ratingLow

Abstract

The global uptake of mobile communication emphasizes the question about possible adverse consequences of the exposure to low-level radiofrequency radiation from mobile phones on human health as result of so-called "non-thermal effects". In order to state safety guidelines it seems appropriate to start by excluding, if possible, non-specific effects on structural and dynamic properties of fundamental biomolecules such as proteins. Proteins are flexible polyelectrolytes; thus, they are susceptible, in principle, to the action of electromagnetic fields. In this article, we investigated the effects of microwaves on structural and functional properties of Tunnus tynnus myoglobin at 1.95 GHz, a frequency used by new wireless microwave communication systems. The protein solution was exposed for 2.5 h to 51 mW/g SAR (specific absorption rate) level. Measurements of absorption spectroscopy, circular dichroism and fluorescence emission decay in the frequency domain do not exhibit any influence of the radiation on the native structural state of protein macromolecules.

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
PopulationTunnus tynnus myoglobin (protein solution)
Sample sizeNot supplied
Exposuremicrowave · 1950 MHz · 51 W/kg · 2.5 h
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

A myoglobin solution exposed to 1.95 GHz microwaves for 2.5 h at 51 mW/g SAR showed no influence of radiation on the native structural state based on absorption spectroscopy, circular dichroism, and fluorescence emission decay measurements.

Outcomes measured

  • native structural state of protein macromolecules
  • absorption spectroscopy
  • circular dichroism
  • fluorescence emission decay (frequency domain)
  • structural and functional properties of myoglobin
  • conformational dynamics
  • ligand binding properties

Limitations

  • Sample size not reported in abstract.
  • In vitro protein solution; findings may not generalize to organisms or human health outcomes.
  • Only one frequency (1.95 GHz), exposure duration (2.5 h), and SAR level (51 mW/g) described in abstract.
  • Outcomes reported focus on structural state; other potential endpoints not described in abstract.
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": "wireless communication systems",
    "frequency_mhz": 1950,
    "sar_wkg": 51,
    "duration": "2.5 h"
  },
  "population": "Tunnus tynnus myoglobin (protein solution)",
  "sample_size": null,
  "outcomes": [
    "native structural state of protein macromolecules",
    "absorption spectroscopy",
    "circular dichroism",
    "fluorescence emission decay (frequency domain)",
    "structural and functional properties of myoglobin",
    "conformational dynamics",
    "ligand binding properties"
  ],
  "main_findings": "A myoglobin solution exposed to 1.95 GHz microwaves for 2.5 h at 51 mW/g SAR showed no influence of radiation on the native structural state based on absorption spectroscopy, circular dichroism, and fluorescence emission decay measurements.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract.",
    "In vitro protein solution; findings may not generalize to organisms or human health outcomes.",
    "Only one frequency (1.95 GHz), exposure duration (2.5 h), and SAR level (51 mW/g) described in abstract.",
    "Outcomes reported focus on structural state; other potential endpoints not described in abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "radiofrequency",
    "mobile phones",
    "non-thermal effects",
    "myoglobin",
    "protein structure",
    "circular dichroism",
    "fluorescence emission decay",
    "SAR",
    "1.95 GHz"
  ],
  "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: 10.1007/s00249-003-0310-2
PubMed: 12811431

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