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

[425 MHz電磁界にばく露した緑豆および空芯菜の成長特性] med./bio.

Growth characteristics of mung beans and water convolvuluses exposed to 425-MHz electromagnetic fields

著者: Jinapang P, Prakob P, Wongwattananard P, Islam NE, Kirawanich P
掲載誌: Bioelectromagnetics 2010; 31 (7): 519-527
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この研究は、緑豆（Vigna raduata L.）と空心菜（Ipomoea aquatica Forssk.）の成長に対する高周波電磁界連続波(CW)の影響を播種前の種および新芽（もやし）を対象に調べた。電磁界ばく露チャンバーにはTEMセルを用い、周波数は425MHz、電磁界強度は1mW、100mW、10W、ばく露期間は1、2、4時間とした。その結果、種にばく露した場合の発芽増進の最適条件は緑豆では100mW/1時間、空心菜では1mW/2時間であった；発芽の最適条件で新芽にばく露した場合、空心菜には生育増進が見られたのに対し、緑豆の新芽には効果が見られなかった、と報告している。

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研究目的（著者による）

To study the effects of radiofrequency electromagnetic fields (specifically of power and duration) on mung beans and water convovuluses at different growth stages (pre-sown seed and early seedling (5-day-old)) to improve crop yields.

詳細情報

The thermal effect was evaluated through water content measurement before and after exposure at different power levels and exposure times.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 425 MHz
ばく露時間: continuous for 1, 2 or 4 hr

ばく露1

主たる特性
周波数 425 MHz
タイプ
  • electromagnetic field
波形
  • sinusoidal
ばく露時間 continuous for 1, 2 or 4 hr
ばく露装置
ばく露の発生源／構造
チャンバの詳細 50 cm x 50 cm x 30 cm exposure chamber designed as TEM cell
ばく露装置の詳細 outer conductor on the top of the TEM cell, inner conductor in the center of the TEM cell serving as support for the test material
パラメータ
測定量 値 種別 Method Mass 備考
電力 1 mW - - - -
電力 100 mW - - - -
電力 10 W - - - -
電力密度 0.015 mW/m² - - - at the center ot the TEM cell at P = 10 W

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
  • ばく露後

研究の主なアウトカム（著者による）

The data showed that 425 MHz electromagnetic fields could improve the growth characteristics of mung beans and water convolvuluses. The effectiveness of the growth enhancement can be controlled by selecting appropriate exposure parameters (power and duration of exposure). The enhancement efficiency also depend on the plant variety and the exposure phase (prior- or post-germination):
The data showed that growth enhancement is optimum for the mung beans at 100 mW/1 h power-duration level (prior germination exposure), while for water convolvuluses the optimum growth power-duration level was 1 mW/2 h.
However, when both seed types were exposed at the early sprouting phase (i.e. 5-day-old) with their respective optimum power-duration levels for optimum growth (i.e. mung bean at 100 mW/1h and water convolvuluses at 1 mW/2 h), water convolvuluses showed growth enhancement while mung bean sprouts showed no effects.
Water content analysis of the seeds suggested thermal effects only at higher field strength (10 W/4 h).

研究の種別:

研究助成

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