Effects of microwave radiation and conductive heating on Tribolium castaneum microstructure.

Micron (Oxford, England : 1993) · 2011 · Mixed · Low evidence

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MixedLow evidencePaper 6503

Study snapshot

PublicationMicron (Oxford, England : 1993) · 2011

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

Microwave radiation and conductive heating were used to completely kill adult Tribolium castaneum (Coleoptera: Tenebrionidae) in wheat flour to protect the flour during storage without significantly effecting its quality. The microstructure of T. castaneum was analyzed to reveal the mechanisms leading to death under microwave and heat treatments. Microwave radiation and conductive heating had different effects on the microstructure of the cuticle of adult T. castaneum and on the ultrastructure of the cells of the epidermis, fat body, and midgut. Both treatments caused a large cavity to appear in the nucleus and the disappearance of mitochondria and the Golgi apparatus. After microwave treatment, there was little change in the surface microstructure but the epidermis was of uneven thickness and the four outer layers of the cuticle were thinner. Nuclear size was essentially unchanged, but fat body cells were fewer and coalesced together. In contrast, conductive heating led to a disordered arrangement of cells on the surface of T. castaneum and indistinct boundaries between layers of the cuticle. The nuclei were enlarged and the fat body cells noticeably fewer and indistinct with a scattered distribution. Thus, microwave treatment produced less severe effects on the surface microstructure and cellular ultrastructure of T. castaneum than did conductive heating. It is concluded that these cellular and surface changes were responsible for the death of T. castaneum.

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 typeanimal

Effect directionmixed

PopulationAdult Tribolium castaneum (Coleoptera: Tenebrionidae) in wheat flour

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Microwave radiation and conductive heating both completely killed adult Tribolium castaneum and produced cellular/structural changes including a large nuclear cavity and disappearance of mitochondria and the Golgi apparatus. Microwave treatment showed little change in surface microstructure but uneven epidermal thickness and thinner outer cuticle layers, while conductive heating caused disordered surface cell arrangement, indistinct cuticle layer boundaries, enlarged nuclei, and more severe ultrastructural effects overall.

Outcomes measured

Mortality (complete kill of adult Tribolium castaneum)
Microstructure of cuticle
Ultrastructure of epidermis cells
Ultrastructure of fat body cells
Ultrastructure of midgut cells
Nuclear morphology (cavity appearance, size/enlargement)
Mitochondria and Golgi apparatus presence/absence
Cuticle layer thickness
Surface cell arrangement/disorder

Limitations

No microwave frequency, power, SAR, or exposure duration reported in the abstract
No sample size or statistical analysis details provided in the abstract
Study compares microwave exposure to conductive heating; thermal vs non-thermal contributions cannot be determined from the abstract alone

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Adult Tribolium castaneum (Coleoptera: Tenebrionidae) in wheat flour",
  "sample_size": null,
  "outcomes": [
    "Mortality (complete kill of adult Tribolium castaneum)",
    "Microstructure of cuticle",
    "Ultrastructure of epidermis cells",
    "Ultrastructure of fat body cells",
    "Ultrastructure of midgut cells",
    "Nuclear morphology (cavity appearance, size/enlargement)",
    "Mitochondria and Golgi apparatus presence/absence",
    "Cuticle layer thickness",
    "Surface cell arrangement/disorder"
  ],
  "main_findings": "Microwave radiation and conductive heating both completely killed adult Tribolium castaneum and produced cellular/structural changes including a large nuclear cavity and disappearance of mitochondria and the Golgi apparatus. Microwave treatment showed little change in surface microstructure but uneven epidermal thickness and thinner outer cuticle layers, while conductive heating caused disordered surface cell arrangement, indistinct cuticle layer boundaries, enlarged nuclei, and more severe ultrastructural effects overall.",
  "effect_direction": "mixed",
  "limitations": [
    "No microwave frequency, power, SAR, or exposure duration reported in the abstract",
    "No sample size or statistical analysis details provided in the abstract",
    "Study compares microwave exposure to conductive heating; thermal vs non-thermal contributions cannot be determined from the abstract alone"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "conductive heating",
    "Tribolium castaneum",
    "insect control",
    "microstructure",
    "ultrastructure",
    "cuticle",
    "epidermis",
    "fat body",
    "midgut",
    "mitochondria",
    "Golgi apparatus"
  ],
  "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: 10.1016/j.micron.2010.08.005
PubMed: 20837396

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