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

[GSM900携帯電話と基地局からの弱いマイクロ波放射へのばく露後の大豆苗の成長低下] med./bio.

Reduced growth of soybean seedlings after exposure to weak microwave radiation from GSM 900 mobile phone and base station.

掲載誌: Bioelectromagnetics 2015; 36 (2): 87-95

この研究は、GSM900携帯電話(短いばく露時間、やや高めの強度)あるいは基地局(長いばく露時間、非常に低い強度)からの放射へのばく露と大豆の苗の成長速度との関連を調べた。ギガヘルツTEMセルを用いて、発芽4日目の苗に、GSMパルス電磁界GSM)または900MHz連続波(CW)のばく露を2時間与えた。高ばく露レベルは41V/m、低ばく露レベルは5.7V/mとした。ばく露後5日における成長を評価した。その結果、高レベルGSM群では上胚軸の伸長がなくなった;低レベルGSM群では影響が見られなかった;高レベルCW群では根の伸長が減少した;低レベルCW群では胚軸の伸長が減少した;この他に、さらに低レベル(0.56V/m)の5日連続ばく露の結果も報告している。

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研究目的(著者による)

To investigate the possible effects of exposure to radiofrequency electromagnetic fields (GSM or continuous wave (CW)) on soybean seedlings.

詳細情報

Seven experiments with different exposure protocols were performed: 1.) 2 h sham exposure + 2 h GSM exposure (electric field strength 41 V/m) 2.) 2 h sham exposure + 2 h GSM exposure (5.7 V/m), 3.) 2 h sham exposure + 2 h GSM exposure (41 V/m) + 2 h sham exposure, 4.) 2 h sham exposure + 2 h GSM exposure (5.7 V/m) + 2 h sham exposure, 5.) 5 days sham exposure + 5 days GSM exposure (0.56 V/m), 6.) 2 h sham exposure + 2 h CW exposure (41 V/m) and 7.) 2 h sham exposure + 2 h CW exposure (5.7 V/m) + 2 h sham exposure. Additional seedlings were sham exposed. The experiments 1, 3, 5, 6, and 7 were conducted twice. The fifth experiment was performed to simulate base station-like conditions, i.e. long lasting but low electric field strength.

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 2 hours
experiment 1 and 3
ばく露2: 900 MHz
Modulation type: pulsed
ばく露時間: continuous for 2 hours
experiment 2 and 4
ばく露3: 900 MHz
Modulation type: pulsed
ばく露時間: continuous for 5 days
experiment 5
ばく露4: 900 MHz
Modulation type: CW
ばく露時間: continuous for 2 hours
experiment 6
ばく露5: 900 MHz
Modulation type: CW
ばく露時間: continuous for 2 hours
experiment 7

General information

EF values were measured with and without the petri dishes present and were found to be identical

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
波形
  • pulsed
ばく露時間 continuous for 2 hours
Additional information experiment 1 and 3
Modulation
Modulation type pulsed
Pulse width 0.576 ms
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • GTEMセル
チャンバの詳細 10 seedlings were placed in a Petri dish (nearly 2.4 cm apart) in total darkness
ばく露装置の詳細 petri dish with seedlings was placed in the middle of the testing area (400 x 400 mm) in the GTEM cell; temperature in the GTEM cell (23°C) was measured at the beginning, during, and at the end of the exposure and did not vary more than ± 0.1°C; humidity level was 70%
パラメータ
測定量 種別 Method Mass 備考
電界強度 41 V/m - 測定値 - -
電力密度 560 mW/m² average over time - - -
電力密度 4,400 mW/m² peak - - -
SAR 2.6 mW/kg - 計算値 - -

ばく露2

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
波形
  • pulsed
ばく露時間 continuous for 2 hours
Additional information experiment 2 and 4
Modulation
Modulation type pulsed
Pulse width 0.576 ms
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • GTEMセル
パラメータ
測定量 種別 Method Mass 備考
電界強度 5.7 V/m - 測定値 - -
電力密度 11 mW/m² average over time - - -
電力密度 86 mW/m² peak - - -
SAR 0.049 mW/kg - 計算値 - -

ばく露3

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
波形
  • pulsed
ばく露時間 continuous for 5 days
Additional information experiment 5
Modulation
Modulation type pulsed
Pulse width 0.576 ms
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • GTEMセル
パラメータ
測定量 種別 Method Mass 備考
電界強度 0.56 V/m - 測定値 - -
電力密度 0.1 mW/m² average over time - - -
電力密度 0.8 mW/m² peak - - -
SAR 0.48 µW/kg - 計算値 - -

ばく露4

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 2 hours
Additional information experiment 6
Modulation
Modulation type CW
ばく露装置
パラメータ
測定量 種別 Method Mass 備考
電界強度 41 V/m - 測定値 - -
電力密度 4,400 mW/m² average over time - - -
電力密度 4,400 mW/m² peak - - -
SAR 20 mW/kg - 計算値 - -

ばく露5

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 2 hours
Additional information experiment 7
Modulation
Modulation type CW
ばく露装置
パラメータ
測定量 種別 Method Mass 備考
電界強度 5.7 V/m - 測定値 - -
電力密度 86 mW/m² average over time - - -
電力密度 86 mW/m² peak - - -
SAR 0.39 mW/kg - 計算値 - -

Reference articles

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)

Seedlings exposed to GSM signals with an electric field strength of 41 V/m (experiments 1 and 3) showed significantly shorter epicotyls compared to sham exposed ones. No significant differences were observed between exposure to electric field strength of 5.7 V/m (experiments 2 and 4) and the sham exposure.
However, exposure of seedlings to a weak electric field strength for five days (experiment 5) resulted in significantly shorter epicotyls and hypocotyls as well as in significantly elongated roots compared to the sham exposed seedlings.
The roots of seedlings that were exposed to CW with an electric field strength of 41 V/m (experiment 6) were significantly shorter than those of the corresponding sham exposure, while in the group exposed to CW with an electric field strength of 5.7 V/m (experiment 7), the hypocotyls were significantly shortened.
The authors conclude that effects of radiofrequency electromagnetic fields on soybean seedlings depend on electric field strengths and modulation characteristics.

研究の種別:

研究助成

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