Viability of fungal and actinomycetal spores after microwave radiation of building materials.

Annals of agricultural and environmental medicine : AAEM · 2007 · Mixed · Low evidence

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MixedLow evidencePaper 3431

Study snapshot

PublicationAnnals of agricultural and environmental medicine : AAEM · 2007

Study typeother

Reported directionMixed

Evidence ratingLow

Abstract

The effects of microwave radiation on viability of fungal and actinomycetal spores growing on agar (medium optimal for growth) as well as on wooden panel and drywall (common building construction/finishing materials) were studied. All materials were incubated at high (97-99%) and low (32-33%) relative humidity to mimic "wet" and "dry" environmental conditions. Two microwave power densities (10 and 60 mW/cm2) and three times of exposure (5, 30, and 60 min) were tested to find the most effective parameters of radiation which could be applied to non-invasive reduction or cleaning of building materials from microbial contaminants. Additionally, a control of the surface temperature during the experiments allowed differentiation between thermal and microwave effect of such radiation. The results showed that the viability of studied microorganisms differed depending on their strains, growth conditions, power density of microwave radiation, time of exposure, and varied according to the applied combination of the two latter elements. The effect of radiation resulting in a decrease of spore viability on "wet" wooden panel and drywall was generally observed at 60 min exposure. Shorter exposure times decreased the viability of fungal spores only, while in actinomycetes colonizing the studied building materials, such radiation caused an opposite (supporting growth) effect.

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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 typeother

Effect directionmixed

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave · 5, 30, and 60 min

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Microwave radiation effects on spore viability depended on microorganism strain, growth conditions (agar vs building materials; wet vs dry), power density (10 vs 60 mW/cm2), and exposure time (5, 30, 60 min). A decrease in spore viability on wet wooden panel and drywall was generally observed at 60 min exposure; shorter exposures decreased fungal spore viability only, while actinomycetes on building materials showed an opposite (growth-supporting) effect.

Outcomes measured

Spore viability (fungal)
Spore viability (actinomycetal)

Limitations

Frequency not reported in abstract/metadata
Sample size not reported
Results described qualitatively without effect sizes or statistical details
Outcomes limited to microbial viability on materials; not directly human health-related

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "microwave",
    "source": "building materials treatment",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "5, 30, and 60 min"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Spore viability (fungal)",
    "Spore viability (actinomycetal)"
  ],
  "main_findings": "Microwave radiation effects on spore viability depended on microorganism strain, growth conditions (agar vs building materials; wet vs dry), power density (10 vs 60 mW/cm2), and exposure time (5, 30, 60 min). A decrease in spore viability on wet wooden panel and drywall was generally observed at 60 min exposure; shorter exposures decreased fungal spore viability only, while actinomycetes on building materials showed an opposite (growth-supporting) effect.",
  "effect_direction": "mixed",
  "limitations": [
    "Frequency not reported in abstract/metadata",
    "Sample size not reported",
    "Results described qualitatively without effect sizes or statistical details",
    "Outcomes limited to microbial viability on materials; not directly human health-related"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave radiation",
    "power density",
    "building materials",
    "wooden panel",
    "drywall",
    "relative humidity",
    "fungal spores",
    "actinomycetal spores",
    "viability",
    "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: Not supplied
PubMed: 18247470

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