この研究は、よく見かけるキネリムシの幼虫を用いた実験で、動物の行動に対する超低周波（ELF）の60 Hz 磁界（MF）の影響を調べた。著者らの以前の研究と同じ高度な実験スキームを使用して、キネリムシ幼虫の60 Hz MFへの応答運動活動の特性を記録した。その結果、MFばく露を受けた三齢幼虫（3回目の脱皮を終えた幼虫）は、擬似ばく露を受けた対照の幼虫に比べ、運動活動の有意な低下を示した；さらに、同じ幼虫に最大3回までMFばく露を繰り返して与えた場合にも同様の反応がみられたが、繰り返し時間によって運動減少の程度は小さくなった；これらの知見は、正弦波電力周波数MFが、昆虫の幼虫の正常な運動活度を妨害する可能性があること、さらには、昆虫が同じMFに対して適応的な脱感作を示すかもしれないことを示唆する、と報告している。
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To investigate the effect of exposure to an extremely low frequency magnetic field on the movement of the common cutworm Spodoptera litura.
After an acclimatization period of 24 hours in the petri dishes, the larvae (caterpillar) were submitted to one of four experimental schemes:
1.) 1 h without any treatment ("cage control"),
2.) 1 h sham exposure (n=18) + 1 h sham exposure (n=18),
3.) 1 h sham exposure (n=45) + 1 h magnetic field exposure (n=45) and
4.) 1 h sham exposure (n=18) + 1 h magnetic field exposure (n=18) followed by 1 h sham exposure (n=18) + 1 h magnetic field exposure (n=18) followed again by 1 h sham exposure (n=9) + 1 h magnetic field exposure (n=9) .
The fourth experiment was performed to test whether the observed effects are reproducible with the same larvae. All experiments were repeated two or three times.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
60 Hz
ばく露時間:
up to 3 hours (à 1 hour exposures, see background/further details)
|
|
| 周波数 | 60 Hz |
|---|---|
| タイプ |
|
| ばく露時間 | up to 3 hours (à 1 hour exposures, see background/further details) |
| ばく露の発生源／構造 | |
|---|---|
| チャンバの詳細 | larvae were exposed in Petri dishes (35 mm diameter) |
| ばく露装置の詳細 | rectangular Helmholtz coils, temperature inside the exposure system 25 ± 0.5°C |
| Sham exposure | A sham exposure was conducted. |
| Additional information | intensity of the ambient stray magnetic field was less than 0.05 µT |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 1 mT | - | 測定値 | - | - |
The magnetic field exposed larvae of the third experiment showed a reduced motor activity in comparison to the sham exposed larvae of the second experiment (not significant). In the fourth experiment, larvae exposed for the first and for the second time showed a significantly decreased motor activity compared to the former sham exposure, respectively. However, larvae exposed for the third time showed no mentionable difference in the motor activity when compared to the former sham exposure.
The authors conclude that exposure to extremely low frequency magnetic fields could affect the motor activity of insect larvae.
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