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

[電磁界発生機と連動するバイオリアクター:酵母のエタノール産出への低周波磁界の影響] med./bio.

Bioreactor coupled with electromagnetic field generator: effects of extremely low frequency electromagnetic fields on ethanol production by Saccharomyces cerevisiae.

掲載誌: Biotechnol Prog 2007; 23 (5): 1091-1094

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研究目的(著者による)

To study the effect of extremely low frequency magnetic fields on ethanol production by the yeast Saccharomyces cerevisiae using sugar cane molasses during batch fermentation.

影響評価項目

ばく露

ばく露 パラメータ
ばく露1:
  • DC/static
ばく露時間: not specified (fermentation time up to 17 h)
permanent magnet exposure
ばく露2:
  • DC/static
ばく露時間: not specified (fermentation time up to 17 h)
solenoid field

General information

Three experiments were conducted: 1) Exposure 1 with 5 mT (maximum distance between magnets) 2) Exposure 1 with 20 mT (minimum distance between magnets) 3) Exposure 1 with 20 mT (minimum distance between magnets) and Exposure 2 (solenoid) sequentially

ばく露1

主たる特性
周波数
  • DC/static
タイプ
  • magnetic field
波形
  • rectangular
ばく露時間 not specified (fermentation time up to 17 h)
Additional information permanent magnet exposure
ばく露装置
ばく露の発生源/構造
  • 6 permanent magnets
チャンバの詳細 Six permanent magnets (square prism, two faces of 4.8 cm x 4.8 cm, 2.4 cm thick), arranged with opposite poles facing (each with 3 in a row). Magnets inserted in a steel box separated horizontally by 2 mm thick iron plates. Distances of the two boxes could be adjusted to supply different magnetic inductions.
ばく露装置の詳細 Configuration allows to obtain uniform magnetic fields in the space between the magnets, generating a square wave with perpendicular field lines; the field changes (caused by the fluid velocity of 0.6, 0.9, 1.2 and 1.4 m/s flowing between the magnets) mimic an extremely low frequency (ELF) field.
Sham exposure A sham exposure was conducted.
パラメータ
測定量 種別 Method Mass 備考
磁束密度 20 mT maximum 測定値 - -
磁束密度 5 mT minimum 測定値 - -

ばく露2

主たる特性
周波数
  • DC/static
タイプ
  • magnetic field
ばく露時間 not specified (fermentation time up to 17 h)
Additional information solenoid field
ばく露装置
ばく露の発生源/構造
ばく露装置の詳細 20 cm long double-layered solenoid
パラメータ
測定量 種別 Method Mass 備考
磁束密度 8 mT - 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)

All magnetic field exposures resulted in higher ethanol yield, except 5 mT, which results were similar to the control experiment. Under the best conditions (0.9-1.2 m/s and 20 mT plus solenoid, field 3), the overall volumetric ethanol productivity was approximately 17% higher than in the control experiment. The fermentations with magnetic treatment reached their final stage in less time, i.e. approximately 2 h earlier, when compared with the control experiment (i.e. 15 h).
In conclusion, the data showed that an extremely low frequency magnetic field induces alterations in ethanol production by Saccharomyces cerevisiae and that the magnetic field treatment can be easily implemented at an industrial scale.

研究の種別:

研究助成

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