この研究は、ウズラの胚の卵黄嚢（YSM）の脈管形成および血管新生に対する磁界ばく露（MF：60Hz、1mT）の影響を、空隙性パラメータ（フラクタル解析の補完的方法）およびマルチフラクタル解析を用いた脈管構造の複雑性の評価により検討した。その結果、一日のばく露時間（6、9、12、14時間）により脈管構造の密度などに違いが見られたと報告している。
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It should be investigated if lacunarity and multifractal dimension analyses are suitable to measure the effects of exposure of embryos of the Japanese quail (Coturnix japonica) to a 60 Hz magnetic field on the development of the vascular system in the yolk sac membrane.
The study was based on Costa et al. 2013 and should refine the method of the monofractal analysis.
100 eggs of the Japanese quail were divided into 5 groups (n=20 each): 1) sham exposure, exposure to the magnetic field 2) for 3 x 2 h/day, 3) for 3 x 3 h/day, 4) for 3 x 4 h/day and 5) for 24 h/day. 48 hours after the eggs had been laid, a small part of the egg shell was removed and replaced by transparent foil for observation and exposure started afterwards.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
60 Hz
ばく露時間:
continuous for 2 h, 3 times a day with intervals of 6 hours in between for 2 days
|
|
|
ばく露2:
60 Hz
ばく露時間:
continuous for 3 h, 3 times a day with intervals of 5 hours in between for 2 days
|
|
|
ばく露3:
60 Hz
ばく露時間:
continuous for 4 h, 3 times a day with intervals of 4 hours in between for 2 days
|
|
|
ばく露4:
60 Hz
ばく露時間:
continuous for 24 h for 2 days
|
|
| 周波数 | 60 Hz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 2 h, 3 times a day with intervals of 6 hours in between for 2 days |
| ばく露の発生源／構造 | |
|---|---|
| ばく露装置の詳細 | Helmholtz coils were placed in an incubator; probes of the teslameter were placed on the horizontal axis of each coil; eggs were placed along the horizontal axis between the two coils |
| Sham exposure | A sham exposure was conducted. |
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 1 mT | - | 測定値 | - | - |
| 周波数 | 60 Hz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 3 h, 3 times a day with intervals of 5 hours in between for 2 days |
| ばく露の発生源／構造 |
|
|---|
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 1 mT | - | 測定値 | - | - |
| 周波数 | 60 Hz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 4 h, 3 times a day with intervals of 4 hours in between for 2 days |
| ばく露の発生源／構造 |
|
|---|
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 1 mT | - | 測定値 | - | - |
| 周波数 | 60 Hz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 24 h for 2 days |
| ばく露の発生源／構造 |
|
|---|
| 測定量 | 値 | 種別 | Method | Mass | 備考 |
|---|---|---|---|---|---|
| 磁束密度 | 1 mT | - | 測定値 | - | - |
After 1 day of exposure, lacunarity of the vascular system was significantly higher in group 3 (3 x 3 h/day of exposure) compared to the sham exposure group. The multifractal analysis showed significant differences in the generalized dimensions spectrum in groups 2 (3 x 2 hours/day of exposure) and 3 compared to the sham exposure group after 1 day of exposure. Both results indicate differences in the development of the vascular system in the respective exposure groups compared to the sham exposure group.
Moreover, in all groups a dominance of the higher generalized dimensions could be detected after 1 and 2 days of exposure in the multifractal analysis, indicating a multifractal dimension of the vascular system and a relative dominance of small vessels in the yolk sac membrane.
The authors conclude that exposure of embryos of the Japanese quail (Coturnix japonica) to a 60 Hz magnetic field could inhibit the development of the vascular system in the yolk sac membrane and that lacunarity and multifractal dimensions analyses are appropriate and complementary methods for the measurement of this endpoint.
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