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Photobiology pp 105-111 | Cite as

Between Ultraviolet and Ionizing Radiation: Action Spectra for Cytotoxicity in the Vacuum-UV Region

  • Takashi Ito

Abstract

Like UV-C, vacuum-UV is strongly absorbed by oxygen, so it does not reach the surface of the earth as in the case of UV-C. The vacuum-UV below 180 nm is strongly absorbed by water. This property is an important difference from UV-C. DNA as well as proteins show the first absorption peak in the vacuum-UV region around 190 nm attributable to the double bonds. For DNA such absorption is due to the π electron system of the bases. In the shorter wavelengths the absorption may be attributed largely to the sugar-phosphate moiety. The σ-σ* transition is generally thought to be responsible. Depending on the wavelength (or photon energy) the molecule may be promoted to the higher excited states (Kiseleva et al., 1975; Ito and Ito, 1986).

Keywords

Synchrotron Radiation Action Spectrum Radiation Research High Excited State Bacillus Subtilis Spore 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1991

Authors and Affiliations

  • Takashi Ito
    • 1
  1. 1.Institute of Physics, College of Arts & SciencesUniversity of TokyoTokyoJapan

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