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

[模擬的な携帯電話タイプのRF放射へのばく露は磁性細菌の死亡率に影響しない] med./bio.

Exposure of magnetic bacteria to simulated mobile phone-type RF radiation has no impact on mortality

著者: Cranfield CG, Wieser HG, Dobson J
掲載誌: IEEE Trans Nanobioscience 2003; 2 (3): 146-149
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この研究は、携帯電話の模擬信号へのばく露が磁性細菌の死亡率に与える影響を調べた。著者は、以前の研究で、市販の携帯電話機の信号を直接に磁性細菌にばく露した場合、死亡率が上昇したと報告した。今回は、十分に特性が明らかな導波管システム内で、GSM信号のRF成分のみのばく露で実験した。その結果、ばく露群と擬似ばく露群で、細胞の死亡率に有意差がなかった；前回報告の細胞死亡の原因は携帯電話信号のRF成分ではないことが示された、と報告している。

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研究目的（著者による）

To examine the effect of mobile phone radio frequency emissions on magnetite-containing (magnetic) bacteria.

詳細情報

Magnetic and electron microscopic analyses of human brain tissue have revealed that biogenic magnetite in human brain tissue is similar to that of magnetite-containing bacteria. Magnetite-containing bacteria cells and closely related nonmagnetic bacteria cells (control group) were exposed and sham-exposed for 30 min.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 1.8 GHz
Modulation type: pulsed
ばく露時間: continuous for 30 min
  • SAR: 2 W/kg maximum

ばく露1

主たる特性
周波数 1.8 GHz
タイプ
  • electromagnetic field
特性
  • guided field
ばく露時間 continuous for 30 min
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional information

The GSM signal included an 8-Hz component (every 26th pulse was blanked) and a 2-Hz DTX component for 34% of the time.
ばく露装置
ばく露の発生源／構造
チャンバの詳細 Two waveguides housed in a temperature-controlled CO2 incubator set at 30 °C were selected at random and blinded by a computer for RF or sham exposure.
ばく露装置の詳細 Six tissue culture Petri dishes (40 mm x 12 mm) containing 3 ml of equally concentrated magnetotactic bacterial cells or CC-26 cells and sealed with laboratory film to make them airtight were placed in each waveguide.
Sham exposure A sham exposure was conducted.
Additional information The exposure system provided very well controlled dosimetry and continuous monitoring of temperature conditions.
パラメータ
測定量 値 種別 Method Mass 備考
SAR 2 W/kg maximum - - -

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）

Both the magnetite-containing bacteria and the nonmagnetite bacterial strain did not show any consistent bioeffects due to radio frequency exposure. Group comparisons did not reveal significant differences in cell mortality.
In the present study previous findings (see publication 11548) could not be replicated.

研究の種別:

研究助成

Replicated studies

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