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

[低強度ミリ波の生物学的影響に関する研究] med./bio.

A study on biological effects of low-intensity millimeter waves.

掲載誌: IEEE Trans Plasma Sci IEEE Nucl Plasma Sci Soc 2002; 30 (4): 1489-1496

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研究目的(著者による)

To study the non-thermal effects of millimeter waves in the frequency range from 41-43 GHz on the growth rate and the absorption spectrum of Escherichia coli. In addition, the effect of this exposure on DNA was studied by measuring plasmid transformation efficiency.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1: 41–43 GHz
ばく露時間: continuous for 40 min.
growth rate experiment
ばく露2: 41.3–41.9 GHz
ばく露時間: not given in the article
relative absorption spectrum of millimeter waves
-
ばく露3: 41–41.7 GHz
ばく露時間: continuous for 15 min.
transformation efficiency

ばく露1

主たる特性
周波数 41–43 GHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 40 min.
Additional information growth rate experiment
ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 1 cm thick piece of Styrofoam placed on top of the pyramidal horn antenna in the anechoic chamber; samples positioned on top of the Styrofoam - one sample in a well in the center of the horn, the other in the adjacent well of a 12-well culture plate
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 32 mW/cm² - 計算値 - for the sample in the center
電力密度 2.6 mW/cm² - 計算値 - for the second sample

ばく露2

主たる特性
周波数 41.3–41.9 GHz
タイプ
  • electromagnetic field
ばく露時間 not given in the article
Additional information relative absorption spectrum of millimeter waves
ばく露装置
ばく露の発生源/構造
  • millimeter wave generator
ばく露装置の詳細 E. coli suspension distributed on a 6 mm x 3 mm rectangle of a 8 mm x 5 mm filter paper with a thickness of 0.17 mm; filter paper placed between two flanges in the path of the millimeter wave
パラメータ

No parameters are specified for this exposure.

ばく露3

主たる特性
周波数 41–41.7 GHz
タイプ
  • electromagnetic field
ばく露時間 continuous for 15 min.
Additional information transformation efficiency
Additional information frequency raised in 0.1 GHz steps
ばく露装置
ばく露の発生源/構造
  • E1と同じ装置
ばく露装置の詳細 a 25 µ l volume of the plasmid was added to one well of a 96-well microtitre plate
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 12 mW/cm² - 計算値 - -

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 data did not show any statistically significant frequency-dependent effects on the growth of bacteria, nor any frequency-dependent effects on the DNA plasmid transformation efficiency. The only indication for resonant effects was found in the absorption spectrum of Escherichia coli. However, in control experiments and by changing the length of the waveguides in the millimeter wave system, the resonant-like absorption was found to be caused by the millimeter wave system itself.
The findings indicate that resonance effects are unlikely in this particular frequency range.

研究の種別:

研究助成

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