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Radiat Environ Biophys. 2003 Oct;42(3):189-92. Epub 2003 Sep 11.

Gamma-radiation dose-rate effects on DNA damage and toxicity in bacterial cells.

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National Research Laboratory of Environmental Biotechnology, Kwangju Institute of Science and Technology, 1 Oryong-dong Buk-gu, 500-712 Gwangju, Republic of Korea.


In order to investigate the relationship between radiation dose-rate and bacterial DNA damage as well as general cellular toxicity, two recombinant Escherichia coli strains, DPD2794 and GC2 were used. Following gamma-ray irradiation, these bioluminescent bacteria showed quantitative stress responses in terms of DNA damage and general toxicity depending on the dose rates of energy deposition, i.e. dose-rate of radiation. In addition, an inverse relationship was found, at lower dose rates between 0.5 and 1 Gy/h and a parabolic relationship at dose rates between 0.5 and 2.6 Gy/h.

[Indexed for MEDLINE]

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