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医学/生物学の研究 (experimental study)

[携帯電話放射は酸化的ストレス誘導によりリョクトウの根の成長を阻害する]

Mobile phone radiation inhibits Vigna radiata (mung bean) root growth by inducing oxidative stress.

掲載誌: Sci Total Environ 2009; 407 (21): 5543-5547

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研究目的(著者による)

To study whether electromagnetic fields from cell phones inhibit growth of mung bean (Vigna radiata) through induction of stress responses.
詳細情報: 50 seeds were exposed and 50 seeds were sham-exposed. After exposure, seeds were allowed to germinate in Petri dishes for 48 h.

影響評価項目

  • effects on plants: root growth and oxidative stress

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 0.5 h, 1 h, 2 hr, 4 hr
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 0.5 h, 1 h, 2 hr, 4 hr
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
ばく露装置
ばく露の発生源/構造
  • セルラ-電話
Distance between exposed object and exposure source 8 cm
チャンバの詳細 26 cm x 47.5 cm x 17.5 cm closed shielded chamber acting as Faraday cage; all walls layered with 2 mm thick aluminum
ばく露装置の詳細 two GSM mobile phones positioned each at one end of the chamber; seeds placed between them; phones used in talk mode
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電力密度 8.55 µW/cm² average over time 測定値 - -
電界強度 5.7 V/m - - - -
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

  • 分子生合成: oxidative stress, formation of reactive oxygen species (content of malondialdehyde and hydrogen peroxide; absorption measurement), root oxidizability (amount of red triphenyl formazan, absorption measurement), enzyme activities of antioxidant enzymes in roots (superoxide dismutase, ascorbate peroxidase, guaiacol peroxidase, catalase and glutathione reductase; absorption measurement); root membrane integrity (ion leakage, electrical conducitivity)
  • effects on plants: root and plumule growth (lengths), germination and oxidative stress (see "molecular biosynthesis")
研究対象とした生物試料:
  • root homogenates and supernatants
  • 生きた生物に関する調査
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 showed that cell phone electromagnetic field exposure significantly inhibited the germination (at ≥2 h), and radicle and plumule growths (≥1 h) in mung bean in a time-dependent manner. Furthermore, exposure enhanced malondialdehyde content (indicating lipid peroxidation), and increased hydrogen peroxide cumulation and root oxidizability in mung bean roots (inducing oxidative stress and cellular damage). Under exposure, there was also a significant upregulation in the enzyme activities of scavenging enzymes in the roots.
The authors conclude that cell phone electromagnetic field exposure inhibit root growth of mung bean by inducing reactive oxygen species-generated oxidative stress despite increased enzyme activities of antioxidant enzymes.
研究の種別:
  • 医学/生物学の研究
  • experimental study
  • full/main study

研究助成

  • 記載なし/研究助成なし

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