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Photobiology

Photobiology is the scientific study of the beneficial and harmful interactions of light (technically, non-ionizing radiation) in living organisms.[1] The field includes the study of photophysics, photochemistry, photosynthesis, photomorphogenesis, visual processing, circadian rhythms, photomovement, bioluminescence, and ultraviolet radiation effects.[2]

The division between ionizing radiation and non-ionizing radiation is typically considered to be a photon energy greater than 10 eV,[3] which approximately corresponds to both the first ionization energy of oxygen, and the ionization energy of hydrogen at about 14 eV.[4]

When photons come into contact with molecules, these molecules can absorb the energy in photons and become excited. Then they can react with molecules around them and stimulate "photochemical" and "photophysical" changes of molecular structures.[1]

  1. ^ a b Smith, Kendrick C. (2014). "What Is Photobiology?". Retrieved 2018-08-02.
  2. ^ Smith, Kendric (2013-03-08). The Science of Photobiology. Springer Science & Business Media. ISBN 9781461580614.
  3. ^ Robert F. Cleveland, Jr.; Jerry L. Ulcek (August 1999). "Questions and Answers about Biological Effects and Potential Hazards of Radiofrequency Electromagnetic Fields" (PDF) (4th ed.). Washington, D.C.: OET (Office of Engineering and Technology) Federal Communications Commission. Archived (PDF) from the original on 2011-10-20. Retrieved 2018-08-02.
  4. ^ Jim Clark (2000). "Ionisation Energy". Archived from the original on 2011-11-26. Retrieved 2018-08-02.

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