研究のタイプ: 医学／生物学の研究 (experimental study)

[携帯電話の生体影響におけるナノレベルの生物由来マグネタイトに基づく強磁性変換メカニズムの予備的評価] med./bio.

Preliminary evaluation of nanoscale biogenic magnetite-based ferromagnetic transduction mechanisms for mobile phone bioeffects

著者: Cranfield C, Wieser HG, Al Madan J, Dobson J
掲載誌: IEEE Trans Nanobioscience 2003; 2 (1): 40-43
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この研究は、強磁性変換モデル（細胞のイオンチャネルの強磁性共振あるいは機械的活性化を介してヒトの脳にあるマグネタイト（Fe3O4）とRFおよびパルス化電磁界がカップリングすることに基づいたモデル）を、磁性細菌（Magnetospirillum magnetotacticum）を用いて実験した。この細菌は、ヒトの脳の細胞内マグネタイトのモデルとして採用したという。実験の結果、携帯電話放射へのばく露群では、擬似ばく露群に比べ、有意に高い割合で細胞死が見られた、と報告している。

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研究目的（著者による）

Ferromagnetic transduction models have been proposed as a potential mechanism for mobile phone effects. These models are based on the coupling of radiofrequency and pulsed electromagnetic emissions to biogenic magnetite present in the human brain via either ferromagnetic resonance or mechanical activation of cellular ion channels.
In this study, these models are tested using a bacterial analogue (Magnetospirillum magnetotacticum) which produces intracellular biogenic magnetite similar to that present in the human brain.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 900 MHz
Modulation type: pulsed
ばく露時間: continuous for 16 min
-

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 16 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional information

Discontinuous transmission signals (DTX) of 2 Hz were created.
ばく露装置
ばく露の発生源／構造
  • セルラ－電話
ばく露装置の詳細 A sterile plastic tube containing 1 ml of medium was placed on a plastic mount directly above the base of the mobile phone. A tone was generated at 2 min on/ 2 min off and fed by earpiece to the microphone of the mobile phone in order to create periods of DTX signals.
Additional information For sham exposures, the tone sequence was running but the phone was switched off.
パラメータ

No parameters are specified for this exposure.

Additional parameter details

Ambient magnetic fields were approx. 0.62 G at the sample holder.

ばく露を受けた生物:

方法 影響評価項目／測定パラメータ／方法

研究対象とした生物試料:
調査の時期:
  • ばく露後

研究の主なアウトカム（著者による）

The data revealed that exposure to mobile phone emissions resulted in a consistent and significantly higher proportion of cell death in exposed cultures versus sham-exposed cultures. Though there seems to be a repeatable trend toward higher cell mortality in magnetite-producing bacteria exposed to mobile phone emissions, it is not yet clear that this would extrapolate to a deleterious health effect in humans.

研究の種別:

研究助成

Replication studies

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