この研究は、異常粘度時間依存性（AVTD）法を用いて、非熱レベルのマイクロ波が大腸菌（Escherichia coli）細胞のゲノム構造状態（GCS）に及ぼす影響を調べた。20GyのX線照射を受けた細胞に誘導されたGCS変化の修復が、直線偏波マイクロ波（51.62-51.84GHz帯の7つの周波数）によって阻害されることが示された、と報告している。
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To study the influence of millimeter waves on the process of the genome conformational state repair in E. coli (with and without preceding exposure to X-rays).
To determine the sign of effective polarization (linear, left-handed circular, and right-handed circular) and parameters of resonances in the 51.62-51.84 GHz band, the effect of differently polarized millimeter waves on the genome conformational state of intact cells and cells exposed to X-rays at a dose of 20 Gy was studied (see "Background/further details"). Other radiation doses of 0.01-3 Gy were also conducted to determine the minimal effective dose.
In a previous study (see publication 10177), linearly polarized microwaves in two frequency bands (41.25-41.50 GHz and 51.62-51.84 GHz) suppressed repair of genome conformational state in cells exposed to 20-30 Gy of X-rays and in both bands, the effect was frequency dependent with resonance frequencies of f = 41.32 GHz and f = 51.76 GHz. In subsequent studies (publication 15590) it was established that right- and left-handed polarized electromagnetic irradiation have different efficiency at resonance frequencies.
| ばく露 | パラメータ |
|---|---|
|
ばく露1:
51.62–51.84 GHz
ばく露時間:
continuous for 10 min after X-ray irradiation
|
|
|
ばく露2:
51.76 GHz
ばく露時間:
continuous for 5 min after X-ray irradiation
|
|
|
ばく露3:
51.76 GHz
ばく露時間:
continuous for 5 min
|
|
|
ばく露4:
51.68–51.85 GHz
ばく露時間:
continuous for 5 min
|
for further information on the exposure setup see: Belyaev, I. Ya., Shcheglov, V. S., and Alipov, Ye. D. "Selection rules on helicity during discrete transitions of the genome conformational state in intact and X-rayed cells of E. coli in millimeter rage of electromagnetic field." In: Charge and Field Effects in Biosystems-3 (M. J. Allen, S. F. Cleary, A. E. Sowers, and D. D. Shillady, eds.), Birkhäuser, Boston, 1992, pp. 115-126 cells were treated in four groups: i) control ii) X-ray irradiation iii) EMF iv) X-rays + EMF
| 周波数 | 51.62–51.84 GHz |
|---|---|
| タイプ |
|
| ばく露時間 | continuous for 10 min after X-ray irradiation |
| ばく露の発生源／構造 |
|
|---|---|
| Additional information | linear, left-handed circular and right-handed circular polarized electromagnetic field used |
| 周波数 | 51.76 GHz |
|---|---|
| タイプ |
|
| 偏波 |
|
| ばく露時間 | continuous for 5 min after X-ray irradiation |
| ばく露の発生源／構造 |
|
|---|---|
| Additional information | left-handed circular and right-handed circular polarized electromagnetic field used |
| 周波数 | 51.76 GHz |
|---|---|
| タイプ |
|
| 偏波 |
|
| ばく露時間 | continuous for 5 min |
| ばく露の発生源／構造 |
|
|---|---|
| Additional information | left-handed circular polarized electromagnetic field used |
| 周波数 | 51.68–51.85 GHz |
|---|---|
| タイプ |
|
| 偏波 |
|
| ばく露時間 | continuous for 5 min |
| ばく露の発生源／構造 |
|
|---|---|
| Additional information | left-handed and right-handed circular polarized electromagnetic field used |
At all the frequencies that were studied, right-handed-polarized microwaves effectively influenced the genome conformational state (GCS) of X-radiated cells, whereas left-handed polarization was ineffective.
Conversely, right-handed polarization was ineffective and left-handed polarized electromagnetic irradiation influenced the GCS when intact cells were exposed to microwaves.
It was shown that the effects of left- and right-handed electromagnetic irradiation on the cells become the same at 50 cGy. This dose is too small to damage any cellular structures except DNA. The results suggest that the target of resonant interaction between E. coli cells and millimeter waves appears to be chromosomal DNA.
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