Impact of a static magnetic field on the electricity production of Shewanella-inoculated microbial fuel cells.

Biosensors & bioelectronics · 2011 · Benefit · Low evidence

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BenefitLow evidencePaper 3277

Study snapshot

PublicationBiosensors & bioelectronics · 2011

Study typeother

Reported directionBenefit

Evidence ratingLow

Abstract

The electricity production of Shewanella-inoculated microbial fuel cells (MFCs) under magnetic field (MF) exposure was investigated in different reactor systems. The persistency of the MF effect and the influences of MF intensity and direction on MFC performance were also studied. Application of a 100-mT static MF to the MFCs improved electricity production considerably, with an increase in the maximum voltage by 20-27% in both single- and two-chamber MFCs, while a more conspicuous improvement in the electricity generation was observed in a three-electrode cell. The MF effects were found to be immediate and reversible, and adverse effects seemed to occur when the MF was suddenly removed. The medium components analysis demonstrated that the application of MF led to an enhanced bioelectrochemical activity of Shewanella, and no significant promotion in mediator secretion was found. The improvement in the electricity production of MFCs under MF was mainly attributed to the enhanced bioelectrochemical activity, possibly through the oxidative stress mechanism. An accelerated cell growth under MF might also contribute to the enhanced substrate degradation and power generation.

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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 directionbenefit

PopulationNot supplied

Sample sizeNot supplied

Exposurestatic

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Applying a 100 mT static magnetic field to Shewanella-inoculated microbial fuel cells increased maximum voltage by 20–27% in single- and two-chamber systems, with a larger improvement reported in a three-electrode cell. The magnetic-field effects were described as immediate and reversible; adverse effects were noted when the field was suddenly removed. Medium component analysis indicated enhanced bioelectrochemical activity without significant promotion of mediator secretion.

Outcomes measured

Electricity production / maximum voltage in microbial fuel cells
Bioelectrochemical activity of Shewanella
Mediator secretion
Cell growth / substrate degradation (suggested)

Limitations

No sample size reported in the abstract.
Exposure duration and detailed exposure protocol are not provided in the abstract.
Mechanistic explanation (e.g., oxidative stress) is presented as possible rather than demonstrated.

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "static",
    "source": "laboratory magnetic field exposure",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Electricity production / maximum voltage in microbial fuel cells",
    "Bioelectrochemical activity of Shewanella",
    "Mediator secretion",
    "Cell growth / substrate degradation (suggested)"
  ],
  "main_findings": "Applying a 100 mT static magnetic field to Shewanella-inoculated microbial fuel cells increased maximum voltage by 20–27% in single- and two-chamber systems, with a larger improvement reported in a three-electrode cell. The magnetic-field effects were described as immediate and reversible; adverse effects were noted when the field was suddenly removed. Medium component analysis indicated enhanced bioelectrochemical activity without significant promotion of mediator secretion.",
  "effect_direction": "benefit",
  "limitations": [
    "No sample size reported in the abstract.",
    "Exposure duration and detailed exposure protocol are not provided in the abstract.",
    "Mechanistic explanation (e.g., oxidative stress) is presented as possible rather than demonstrated."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "static magnetic field",
    "100 mT",
    "microbial fuel cell",
    "Shewanella",
    "bioelectrochemical activity",
    "maximum voltage",
    "electricity production"
  ],
  "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.bios.2010.11.027
PubMed: 21493055

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