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UV-A pp 85–106Cite as

Effects of Ultraviolet Radiation on Microorganisms and Animal Cells

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Abstract

The photobiologic reactions of multicellular organisms depend upon what happens to individual living cells within their organ systems, which in turn is determined by individual intracellular photochemical reactions. Ultraviolet radiation may inactivate enzymes in numerous biologic systems by producing alterations in proteins. Peptide bonds may be split, photochemical oxidations may occur, sulfide and disulfide bonds may be altered, and DNA may be photochemically changed. In order for this photochemistry to occur, radiation must be absorbed, providing the molecular activation energy to initiate photochemical reactions. All absorption of radiant energy, however, does not lead to photochemistry, because of competition by other mechanisms for dissipating the absorbed energy, such as fluorescence, phosphorescence, or nonradiative deexcitation.

Keywords

  • Ultraviolet Radiation
  • Photochemical Reaction
  • Excision Repair
  • Action Spectrum
  • Excited Triplet State

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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Authors and Affiliations

  1. Harvard Medical School, USA

    John A. Parrish M.D. & R. Rox Anderson

  2. Skin and Cancer Hospital, Temple University School of Medicine, USA

    Frederick Urbach M.D.

  3. College of Optometry, University of Houston, USA

    Donald Pitts O.D., Ph.D.

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  1. John A. Parrish M.D.
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  2. R. Rox Anderson
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  3. Frederick Urbach M.D.
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  4. Donald Pitts O.D., Ph.D.
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Parrish, J.A., Anderson, R.R., Urbach, F., Pitts, D. (1978). Effects of Ultraviolet Radiation on Microorganisms and Animal Cells. In: UV-A. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2475-1_5

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  • DOI: https://doi.org/10.1007/978-1-4684-2475-1_5

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