Influence of low intensity 2,450 MHz microwave radiation upon the growth of various micro-organisms and their sensitivity towards chemical inactivation.

Abstract

The non-lethal effects of 2,450 MHz radiation upon vegetative cell of P. aeruginosa and S. aureus have been assessed at low power intensities (1 joule min-1 ml-1) over a prolonged time period (16 h). Results indicated that the cell envelope was a primary target for such radiation. Growth of micro-organisms in the presence of microwaves produced minor structural changes in their cell envelopes which resulted in an alteration of preservative sensitivity. Such changes were not sufficiently great as to result in any alteration of specific growth rates during continuous microwave exposure, neither was motility nor cellular morphology affected.

AI evidence extraction

Main findings

In vegetative cells of P. aeruginosa and S. aureus exposed to low-intensity 2,450 MHz radiation (1 joule min-1 ml-1) for 16 h, minor structural changes in the cell envelope were reported, associated with altered preservative sensitivity. No alteration of specific growth rates during continuous exposure was observed, and motility and cellular morphology were not affected.

Outcomes measured

• Microbial growth rate
• Cell envelope structural changes
• Preservative/chemical inactivation sensitivity
• Motility
• Cellular morphology

Limitations

• Exposure metric reported as power intensity (1 joule min-1 ml-1) rather than SAR or field strength
• No sample size or replication details provided in the abstract
• Only two microorganism species assessed
• Outcome measures and statistical methods not described in the abstract

{
    "study_type": "in_vitro",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": 2450,
        "sar_wkg": null,
        "duration": "16 h"
    },
    "population": null,
    "sample_size": null,
    "outcomes": [
        "Microbial growth rate",
        "Cell envelope structural changes",
        "Preservative/chemical inactivation sensitivity",
        "Motility",
        "Cellular morphology"
    ],
    "main_findings": "In vegetative cells of P. aeruginosa and S. aureus exposed to low-intensity 2,450 MHz radiation (1 joule min-1 ml-1) for 16 h, minor structural changes in the cell envelope were reported, associated with altered preservative sensitivity. No alteration of specific growth rates during continuous exposure was observed, and motility and cellular morphology were not affected.",
    "effect_direction": "mixed",
    "limitations": [
        "Exposure metric reported as power intensity (1 joule min-1 ml-1) rather than SAR or field strength",
        "No sample size or replication details provided in the abstract",
        "Only two microorganism species assessed",
        "Outcome measures and statistical methods not described in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "2450 MHz",
        "microwave radiation",
        "low intensity",
        "Pseudomonas aeruginosa",
        "Staphylococcus aureus",
        "cell envelope",
        "preservative sensitivity",
        "chemical inactivation",
        "growth rate"
    ],
    "suggested_hubs": []
}

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