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Archives of Microbiology

, Volume 193, Issue 11, pp 797–809 | Cite as

Survival of thermophilic and hyperthermophilic microorganisms after exposure to UV-C, ionizing radiation and desiccation

  • Kristina BebloEmail author
  • Thierry Douki
  • Gottfried Schmalz
  • Reinhard Rachel
  • Reinhard Wirth
  • Harald Huber
  • Günther Reitz
  • Petra Rettberg
Original Paper

Abstract

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.

Keywords

Radiation UV-C Ionizing Survival Hyperthermophilic Desiccation 

Notes

Acknowledgments

The authors want to thank Prof. Dr. Reinhard Sterner (Institute of Biophysics und Physical Biochemistry, University of Regensburg, Germany) for fruitful discussions and Dr. Andreas Klingl (Center for Electron Microscopy, University of Regensburg, Germany) for performing the scanning electron microscopy. Survival data from B. subtilis and D. radiodurans were kindly provided by Marko Wassmann and Anja Bauermeister (both German Aerospace Centre, Institute of Aerospace Medicine, Radiation Biology Division, Cologne, Germany).

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Kristina Beblo
    • 1
    • 2
    Email author
  • Thierry Douki
    • 3
  • Gottfried Schmalz
    • 4
  • Reinhard Rachel
    • 5
  • Reinhard Wirth
    • 2
  • Harald Huber
    • 2
  • Günther Reitz
    • 1
  • Petra Rettberg
    • 1
  1. 1.Radiation Biology Division, Institute of Aerospace MedicineGerman Aerospace Center (DLR e.V.)CologneGermany
  2. 2.Institute for Microbiology and Archaea Center, Faculty of Biology and Preclinical MedicineUniversity RegensburgRegensburgGermany
  3. 3.Laboratoire “Lésions des Acides Nucléiques”, Service de Chimie Inorganique et Biologique, CEA/DSM/Département de Recherche Fondamentale sur la Matière CondenséeCEA-GrenobleGrenobleFrance
  4. 4.Department of Operative Dentistry and PeriodontologyRegensburg University ClinicsRegensburgGermany
  5. 5.Center for Electron Microscopy, Faculty of Biology and Preclinical MedicineUniversity RegensburgRegensburgGermany

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