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

[携帯電話電磁放射は生化学プロセスの損傷を通して発根に影響を与える] med./bio.

Cell phone electromagnetic field radiations affect rhizogenesis through impairment of biochemical processes.

掲載誌: Environ Monit Assess 2012; 184 (4): 1813-1821

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研究目的(著者による)

To study the effects of 900 MHz cell phone exposure on root formation in mung bean hypocotyls (stem of a germinating seedling, found below the seed leaves and above the root), a model system for rhizogenesis in plants.

詳細情報

16 glass vials (each containing five hypocotyls) were used for each exposure condition (including control). Each experiment (exposure condition) was repeated for three times. After the exposure, the hypocotyls were transferred into a growth chamber for seven days. For each enzymatic/biochemical analysis, there were five replicated tissue 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: pulsed
ばく露時間: continuous for 0.5, 1, 2 h

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, 1, 2 h
Additional information cell phones in talk and listen mode
Modulation
Modulation type pulsed
Repetition frequency 217 Hz
Additional information

additional frequency: 8.34 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 6 cm
チャンバの詳細 with 2 mm thick aluminum sheets shielded 47.5 cm x 27 cm x 17.5 cm chamber
ばく露装置の詳細 two cell phones placed along the chamber's walls; 12 glass vials containing the hypocotyls positioned between them (according to the figure in the article); constant temperature of 25 +/- 1°C inside the chamber
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
電界強度 5.7 V/m spatial average - - in the chamber
電力密度 8.549 µW/cm² spatial average 測定値 - -

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 number of roots per hypocotyl and the average root length decreased significantly in response to cell phone exposure. The inhibitory effect increased with the period of exposure time. Additionally, the length of emerged roots was lesser in exposed hypocotyls.
The cell phone exposure enhanced the enzyme activities of proteases, polyphenol oxidases, and peroxidases in mung bean hypocotyls in comparison with the control. Furthermore, the electromagnetic field exposure enhanced the malondialdehyde level, the hydrogen peroxide, and proline content, indicating a reactive oxygen species-mediated oxidative damage in the hypocotyls. This was confirmed by the upregulation in the enzyme activities of all antioxidant enzymes suggesting their possible role in providing protection against mobile phone exposure-induced oxidative damage.
The authors concluded that cell phone exposure affect (inhibit) the process of rhizogenesis through biochemical alterations that manifest as oxidative damage resulting in root impairment.

研究の種別:

研究助成

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