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

[ウシの酸化還元タンパク質の活性に対する基地局の非電離放射線の影響] med./bio.

Influence of non ionizing radiation of base stations on the activity of redox proteins in bovines.

掲載誌: BMC Vet Res 2014; 10: 136

この研究は、バックグラウンド電磁界が低い郊外の動物病院の牛舎にGSM信号送信アンテナを設置して、10匹の雌ウシ(年齢多様、6匹は妊娠中)の血液パラメータへの非電離放射線NIRばく露の影響を調べた。実験期間は2012年11月-2013年2月で、事前観察2週間、ばく露期間4週間、事後観察4週間であった。10匹が個体別に仕切られ並んだ位置の後方2mの平行線上に等間隔で3本のアンテナを並べた。各個体の位置での平均入射電力は12V/mであった。実験期間中、尾静脈から採血した(2週間に10回)。その結果、NIRばく露により一部の酵素活性が低下あるいは上昇した;ただし、そのような変化のパターンは個体により異なった;行動観察では、NIRに反応する個体、全く反応しない個体があった、と報告している。

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研究目的(著者による)

The effects of a whole body exposure of cattle to a 900 MHz electromagnetic GSM field on oxidative stress in the blood should be investigated.

詳細情報

10 cattle were examined. The test lasted for a total of 10 weeks, including a 4-week exposure period. During the first two weeks without exposure, 10 samples per animal, one per day, were taken (pre-exposure samples as control). Afterwards, exposure started (week 3 - 6) and in the weeks 5 and 6, a total of 10 samples per animal, one per day, was taken again (exposure samples). Following exposure, post-exposure took place (week 7 - 10) and finally, a total of 10 samples per animal, one per day, was taken in the weeks 9 and 10 (post-exposure samples).

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: AM, pulsed
ばく露時間: intermittent exposure for min. 6 h 36 min, max. 19 h and 16 h 43 min on average per day with a standard deviation of 3 h 03 min for 30 days

ばく露1

主たる特性
周波数 900 MHz
タイプ
  • electromagnetic field
ばく露時間 intermittent exposure for min. 6 h 36 min, max. 19 h and 16 h 43 min on average per day with a standard deviation of 3 h 03 min for 30 days
Modulation
Modulation type AM, pulsed
Additional information

carrier frequency of 916.5 MHz

ばく露装置
ばく露の発生源/構造
  • antenna
チャンバの詳細 cows were housed and exposed in tie stalls next to each other; they were kept outside on a square in front of the barn to move freely for 2 h/day
ばく露装置の詳細 three 900 MHz antennas installed at 2 m height behind the cows with a 30° downward tilt
パラメータ
測定量 種別 Method Mass 備考
電界強度 3.4 V/m minimum 測定値 - in the empty stalls
電界強度 29 V/m maximum 測定値 - in the empty stalls
電界強度 12 V/m spatial average 測定値 - in the empty stalls

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:
  • ばく露前
  • ばく露中
  • ばく露後

研究の主なアウトカム(著者による)

The enzyme activity of glutathione peroxidase was significantly increased, whereas the superoxide dismutase activity was significantly decreased in exposure samples compared to pre-exposure samples. The catalase activity, however, did not show any significant changes between these samples but a significant decrease in post-exposure samples compared to exposure.
The authors conclude, that a whole body exposure of cattle to a 900 MHz electromagnetic GSM field could influence enzyme activity in the blood. However, present results allow no conclusion regarding oxidative stress and further, improved studies on this topic are necessary.

研究の種別:

研究助成

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