Effects of Lasers on Biologic Tissue: Options for Specificity

  • J. A. Parrish
Part of the Ettore Majorana International Science Series book series (EMISS, volume 22)


In any tissue most biologic effects of optical radiation are usually caused by either or both of two basic mechanisms: (1) responses to photochemical reactions, and (2) responses to the heat caused by non-radiative deexcitation and dissipation of the absorbed energy. Host responses to extensive photochemical cell injury are not qualitatively very different from the inflammation and repair which occur from injury by many physical and chemical agents. However, in the case of more subtle cell alterations, the inherent specificity of photochemical reactions may lead to quantitative differences in host response to various wavelengths. In fact many biological responses to in vivo photochemical reactions can be very wavelength-dependant and quite specific. In vivo extracellular photochemical reactions may also have very specific effects on the host.


Photochemical Reaction Thermal Alteration Spatial Confinement Inherent Specificity Normal Human Volunteer 
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Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • J. A. Parrish
    • 1
  1. 1.Department of Dermatology, Harvard Medical SchoolMassachusetts General HospitalBostonUSA

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