Survival of thermophilic and hyperthermophilic microorganisms after exposure to UV-C, ionizing radiation and desiccation.
Summary of "Survival of thermophilic and hyperthermophilic microorganisms after exposure to UV-C, ionizing radiation and desiccation."
In this study, we investigated the ability of several (hyper-) thermophilic Archaea and phylogenetically deep-branching thermophilic Bacteria to survive high fluences of monochromatic UV-C (254 nm) and high doses of ionizing radiation, respectively. Nine out of fourteen tested microorganisms showed a surprisingly high tolerance against ionizing radiation, and two species (Aquifex pyrophilus and Ignicoccus hospitalis) were even able to survive 20 kGy. Therefore, these species had a comparable survivability after exposure to ionizing radiation such as Deinococcus radiodurans. In contrast, there was nearly no difference in survival of the tested strains after exposure to UV-C under anoxic conditions. If the cells had been dried in advance of UV-C irradiation, they were more sensitive to UV-C radiation compared with cells irradiated in liquid suspension; this effect could be reversed by the addition of protective material like sulfidic ores before irradiation. By exposure to UV-C, photoproducts were formed in the DNA of irradiated Archaea and Bacteria. The distribution of the main photoproducts was species specific, but the amount of the photoproducts was only partly dependent on the applied fluence. Overall, our results show that tolerance to radiation seems to be a common phenomenon among thermophilic and hyperthermophilic microorganisms.
Affiliation
Radiation Biology Division, Institute of Aerospace Medicine, German Aerospace Center (DLR e.V.), Linder Hoehe, 51147, Cologne, Germany, kristina.beblo@dlr.de.
Journal Details
This article was published in the following journal.
Name: Archives of microbiology
ISSN: 1432-072X
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21638055
- DOI: http://dx.doi.org/10.1007/s00203-011-0718-5
Medical and Biotech [MESH] Definitions
Abnormalities, Radiation-induced
Congenital changes in the morphology of organs produced by exposure to ionizing or non-ionizing radiation.
Radiation Injuries
Harmful effects of non-experimental exposure to ionizing or non-ionizing radiation in VERTEBRATES.
Leukemia, Radiation-induced
Leukemia produced by exposure to IONIZING RADIATION or NON-IONIZING RADIATION.
Neoplasms, Radiation-induced
Tumors, cancer or other neoplasms produced by exposure to ionizing or non-ionizing radiation.
Health Physics
The science concerned with problems of radiation protection relevant to reducing or preventing radiation exposure, and the effects of ionizing radiation on humans and their environment.
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