Microwave radiation effects on the thermally driven oxidase of erythrocytes.

International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group · 1986 · Mixed · Low evidence

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MixedLow evidencePaper 6200

Air heating significantly decreased residual chemiluminescence (CL) at temperatures above 37°C (reported 74% decrease at 45°C). Microwave exposure (2450 MHz, 91 W/kg, 10 min) inhibited the temperature-associated decline in residual CL above 37°C (reported 40%…

Study snapshot

PublicationInternational journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group · 1986

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

Sheep red blood cells (SRBCs) were labelled with a concanavalin A-luminol-bovine serum albumin conjugate specific for the transmembrane anion transport protein (Band 3) and exposed to 2450 MHz continuous wave microwave radiation at an average specific absorption rate of 91 W/kg for 10 min. The temperature was held constant at 25, 37, 40, 42 or 45 degrees C with an airflow heat exchange system. Following exposure to microwave or air heating, the decrease in residual base-activated chemiluminescence (CL) of the SRBCs was measured as an indication of infield oxidase activity. Air heating resulted in a significant decrease in residual CL at temperatures above 37 degrees C (74 per cent decrease at 45 degrees C). Microwave radiation inhibited the decline in residual CL above 37 degrees C. At 45 degrees C the inhibition was 40 per cent. The results suggest microwave radiation either reversibly altered the thermodynamics of oxygen binding to haemoglobin or failed to energize a significant portion of the haemoglobin molecules in each sample to the thermal threshold of haemoglobin autoxidation.

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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

PopulationSheep red blood cells (SRBCs)

Sample sizeNot supplied

Exposuremicrowave · 2450 MHz · 91 W/kg · 10 min

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Outcomes measured

Residual base-activated chemiluminescence (CL) as an indication of infield oxidase activity
Temperature-dependent change in residual CL after microwave exposure vs air heating

Limitations

Sample size not reported in abstract
In vitro study using sheep red blood cells; generalizability to humans/health outcomes is unclear
Outcome is a biochemical proxy (chemiluminescence/oxidase activity), not a clinical endpoint
Mechanistic interpretation is speculative in the abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": 2450,
    "sar_wkg": 91,
    "duration": "10 min"
  },
  "population": "Sheep red blood cells (SRBCs)",
  "sample_size": null,
  "outcomes": [
    "Residual base-activated chemiluminescence (CL) as an indication of infield oxidase activity",
    "Temperature-dependent change in residual CL after microwave exposure vs air heating"
  ],
  "main_findings": "Air heating significantly decreased residual chemiluminescence (CL) at temperatures above 37°C (reported 74% decrease at 45°C). Microwave exposure (2450 MHz, 91 W/kg, 10 min) inhibited the temperature-associated decline in residual CL above 37°C (reported 40% inhibition at 45°C).",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in abstract",
    "In vitro study using sheep red blood cells; generalizability to humans/health outcomes is unclear",
    "Outcome is a biochemical proxy (chemiluminescence/oxidase activity), not a clinical endpoint",
    "Mechanistic interpretation is speculative in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "2450 MHz",
    "specific absorption rate",
    "SAR",
    "erythrocytes",
    "sheep red blood cells",
    "Band 3",
    "chemiluminescence",
    "oxidase activity",
    "thermal effects",
    "hyperthermia"
  ],
  "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: 10.3109/02656738609012395
PubMed: 3794416

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