[The impact of electromagnetic radiation at microwave frequency (9.8 HhZ)on the embryonic and postembryonic development of the tick Hyalomma asiaticum (Acarina, Ixodidae)].

Meditsinskaia parazitologiia i parazitarnye bolezni · 2000 · Mixed · Low evidence

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MixedLow evidencePaper 3934

Study snapshot

PublicationMeditsinskaia parazitologiia i parazitarnye bolezni · 2000

Study typeanimal

Reported directionMixed

Evidence ratingLow

Abstract

Low-power (20 microW/cm2) microwave-modulated radiation at a carrier frequency of 9.8 Hhz is shown to affect the course and specific features of ontogenesis of the ick H. asiaticum. The actin of microwave radiation on the development of H. asiaticum substantially depends on the frequency of microwave modulation of a signal and on the temperatures of an experiment. When the temperature is 22 degrees C, there is a significant suppression of development of fed larvae and nymphs after exposure to microwave radiation at modulated signal frequencies of 3 and 5 Hz/ The whole range of the tested modulation frequencies was 2 to 16 Hz. The hungry species of all developmental phases in H. asiaticum were virtually unresponsive to exposures. At 14 degrees C (a perithreshold temperature of H. asiaticum development), the action of microwave radiation changed from inhibitory to stimulating. At modulation frequencies of 3, 5 and 7 Hz, the proportion of hatching larvae was 42.5, 67.5 and 80.0%, respectively, and that of controls was 2.5%. Whether the size of a H.asiaticum population can be controlled by a radar that provokes the development of ticks before winter by its radiation is discussed.

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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 typeanimal

Effect directionmixed

PopulationTick Hyalomma asiaticum (Acarina, Ixodidae); larvae and nymphs (fed and hungry)

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Low-power (20 microW/cm2) microwave-modulated radiation with a 9.8 GHz carrier frequency affected ontogenesis of Hyalomma asiaticum, with effects depending on modulation frequency (tested 2–16 Hz) and temperature. At 22°C, development of fed larvae and nymphs was significantly suppressed after exposure at modulation frequencies of 3 and 5 Hz, while hungry developmental phases were virtually unresponsive. At 14°C, the effect shifted from inhibitory to stimulating; at modulation frequencies of 3, 5, and 7 Hz, hatching larvae proportions were 42.5%, 67.5%, and 80.0% versus 2.5% in controls.

Outcomes measured

Embryonic and postembryonic development/ontogenesis
Developmental suppression or stimulation (temperature- and modulation-dependent)
Proportion of hatching larvae

Limitations

Sample size not reported in the abstract
Exposure duration and other exposure conditions not described beyond power density and frequencies
Outcomes and statistical details are only partially reported (e.g., significance mentioned without methods)

View raw extracted JSON

{
  "study_type": "animal",
  "exposure": {
    "band": "microwave",
    "source": "radar",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Tick Hyalomma asiaticum (Acarina, Ixodidae); larvae and nymphs (fed and hungry)",
  "sample_size": null,
  "outcomes": [
    "Embryonic and postembryonic development/ontogenesis",
    "Developmental suppression or stimulation (temperature- and modulation-dependent)",
    "Proportion of hatching larvae"
  ],
  "main_findings": "Low-power (20 microW/cm2) microwave-modulated radiation with a 9.8 GHz carrier frequency affected ontogenesis of Hyalomma asiaticum, with effects depending on modulation frequency (tested 2–16 Hz) and temperature. At 22°C, development of fed larvae and nymphs was significantly suppressed after exposure at modulation frequencies of 3 and 5 Hz, while hungry developmental phases were virtually unresponsive. At 14°C, the effect shifted from inhibitory to stimulating; at modulation frequencies of 3, 5, and 7 Hz, hatching larvae proportions were 42.5%, 67.5%, and 80.0% versus 2.5% in controls.",
  "effect_direction": "mixed",
  "limitations": [
    "Sample size not reported in the abstract",
    "Exposure duration and other exposure conditions not described beyond power density and frequencies",
    "Outcomes and statistical details are only partially reported (e.g., significance mentioned without methods)"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave-modulated radiation",
    "9.8 GHz",
    "20 microW/cm2",
    "modulation frequency",
    "temperature dependence",
    "tick",
    "Hyalomma asiaticum",
    "ontogenesis",
    "larval hatching"
  ],
  "suggested_hubs": [
    {
      "slug": "animal-studies",
      "weight": 0.9,
      "reason": "Experimental study of microwave exposure effects on tick development (non-human organism)."
    }
  ]
}

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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: 16416556

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