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Journal of Zhejiang University SCIENCE B
ISSN 1673-1581(Print), 1862-1783(Online), Monthly
2010 Vol.11 No.10 P.801-805
Effects of differently polarized microwave radiation on the microscopic structure of the nuclei in human fibroblasts
Abstract: To investigate the influence of microwave radiation on the human fibroblast nuclei, the effects of three variants of electromagnetic wave polarization, linear and left-handed and right-handed elliptically polarized, were examined. Experimental conditions were: frequency (f) 36.65 GHz, power density (P) at the surface of exposed object 1, 10, 30, and 100 µW/cm2, exposure time 10 s. Human fibroblasts growing in a monolayer on a cover slide were exposed to microwave electromagnetic radiation. The layer of medium that covered cells during microwave exposure was about 1 mm thick. Cells were stained immediately after irradiation by 2% (w/v) orcein solution in 45% (w/v) acetic acid. Experiments were made at room temperature (25 °C), and control cell samples were processed in the same conditions. We assessed heterochromatin granule quantity (HGQ) at 600× magnification. Microwave irradiation at the intensity of 1 µW/cm2 produced no effect, and irradiation at the intensities of 10 and 100 µW/cm2 induced an increase in HGQ. More intense irradiation induced more chromatin condensation. The right-handed elliptically polarized radiation revealed more biological activity than the left-handed polarized one.
Key words: Human cells, Chromatin, Heterochromatin, Electromagnetic field, Elliptical polarization
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DOI:
10.1631/jzus.B1000051
CLC number:
Q24
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On-line Access:
2010-10-05
Received:
2010-02-16
Revision Accepted:
2010-06-03
Crosschecked:
2010-09-03
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