DNA damage action spectroscopy and DNA repair in intact organisms: Alfalfa seedlings

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Understanding the effects of UV, and increased levels of UV, on DNA in living organisms requires knowledge of both the frequency of damages induced by the quantities and quality (wavelength composition) of the damaging radiation, and of the capacity of the organisms to carry out efficient and accurate repair. The major levels of uncertainty in understanding the responses of intact organisms, both plant and animal, to UV indicates that we cannot assess accurately the impact of stratospheric ozone depletion without major increases in knowledge of DNA damage and repair. What repair paths does alfalfa use for dealing with UV damages? ... continued below

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25 p.

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Sutherland, B. M.; Quaite, F. E. & Sutherland, J. C. December 31, 1993.

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Description

Understanding the effects of UV, and increased levels of UV, on DNA in living organisms requires knowledge of both the frequency of damages induced by the quantities and quality (wavelength composition) of the damaging radiation, and of the capacity of the organisms to carry out efficient and accurate repair. The major levels of uncertainty in understanding the responses of intact organisms, both plant and animal, to UV indicates that we cannot assess accurately the impact of stratospheric ozone depletion without major increases in knowledge of DNA damage and repair. What repair paths does alfalfa use for dealing with UV damages? The rate of pyrimidine dimers induced at a low exposure of 280 nm radiation to alfalfa seedlings, was observed to be about 8 dimers/million bases. After UV exposure, the seedlings were kept in the dark or exposed to blue light filtered by a yellow. filter which excluded wavelengths shorter than about 405 nm. Seedlings so exposed carry out photorepair, but do not seem to remove dimers by excision.

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25 p.

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OSTI as DE96004161

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  • NATO advanced reserch workshop stratospheric ozone depletion/UV-B radiation in the biosphere, Gainesville, FL (United States), 14-17 Jun 1993

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  • Other: DE96004161
  • Report No.: BNL--62463
  • Report No.: CONF-9306432--1
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 197808
  • Archival Resource Key: ark:/67531/metadc665667

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  • December 31, 1993

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  • June 29, 2015, 9:42 p.m.

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  • Nov. 9, 2015, 7:50 p.m.

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Sutherland, B. M.; Quaite, F. E. & Sutherland, J. C. DNA damage action spectroscopy and DNA repair in intact organisms: Alfalfa seedlings, article, December 31, 1993; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc665667/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.