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The influence of millimeter waves on the physical properties of large and giant unilamellar vesicles.

Journal of biological physics · 2013 · Mixed · Low evidence

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MixedLow evidencePaper 4590

Lipid vesicles exposed to 52–72 GHz radiation at incident power densities of 0.0035–0.010 mW/cm^2 showed inhibition of aging processes (Ostwald ripening) in LUVs and decreased membrane water permeability in GUVs under osmotic stress.

Study snapshot

PublicationJournal of biological physics · 2013
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

Exposure of cell membranes to an electromagnetic field (EMF) in the millimeter wave band (30-300 GHz) can produce a variety of responses. Further, many of the vibrational modes in complex biomolecules fall in the 1-100 GHz range. In addition to fundamental scientific interest, this may have applications in the development of diagnostic and therapeutic medical applications. In the present work, lipid vesicles of different size were used to study the effects of exposure to radiation at 52-72 GHz, with incident power densities (IPD) of 0.0035-0.010 mW/cm(2), on the chemical-physical properties of cell membranes. Large unilamellar vesicles (LUVs) were used to study the effect of the radiation on the physical stability of vesicles by dynamic light scattering. An inhibition of the aging processes (Ostwald ripening), which usually occur in these vesicles because of their thermodynamic instability, resulted. Giant unilamellar vesicles (GUVs) were used to study the effect of the radiation on membrane water permeability under osmotic stress by phase contrast microscopy. In this case, a decrease in the water membrane permeability of the irradiated samples was observed. We advance the hypothesis that both the above effects may be explained in terms of a change of the polarization states of water induced by the radiation, which causes a partial dehydration of the membrane and consequently a greater packing density (increased membrane rigidity).

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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
ExposuremmWave
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Lipid vesicles exposed to 52–72 GHz radiation at incident power densities of 0.0035–0.010 mW/cm^2 showed inhibition of aging processes (Ostwald ripening) in LUVs and decreased membrane water permeability in GUVs under osmotic stress.

Outcomes measured

  • Physical stability/aging processes (Ostwald ripening) in large unilamellar vesicles (LUVs)
  • Membrane water permeability under osmotic stress in giant unilamellar vesicles (GUVs)
  • Chemical-physical properties of lipid vesicle membranes

Limitations

  • In vitro model using lipid vesicles rather than living cells or organisms
  • No exposure duration reported in the abstract
  • No sample size reported in the abstract
  • Mechanistic explanation presented as a hypothesis
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "mmWave",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Physical stability/aging processes (Ostwald ripening) in large unilamellar vesicles (LUVs)",
    "Membrane water permeability under osmotic stress in giant unilamellar vesicles (GUVs)",
    "Chemical-physical properties of lipid vesicle membranes"
  ],
  "main_findings": "Lipid vesicles exposed to 52–72 GHz radiation at incident power densities of 0.0035–0.010 mW/cm^2 showed inhibition of aging processes (Ostwald ripening) in LUVs and decreased membrane water permeability in GUVs under osmotic stress.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro model using lipid vesicles rather than living cells or organisms",
    "No exposure duration reported in the abstract",
    "No sample size reported in the abstract",
    "Mechanistic explanation presented as a hypothesis"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "millimeter waves",
    "52-72 GHz",
    "incident power density",
    "lipid vesicles",
    "large unilamellar vesicles",
    "giant unilamellar vesicles",
    "dynamic light scattering",
    "phase contrast microscopy",
    "Ostwald ripening",
    "membrane permeability"
  ],
  "suggested_hubs": [
    {
      "slug": "5g-policy",
      "weight": 0.25,
      "reason": "Study involves millimeter-wave frequencies (52–72 GHz), relevant to mmWave discussions, though not explicitly about 5G."
    }
  ]
}
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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/s10867-012-9296-2
PubMed: 23860916

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