Role of clays in protecting adsorbed DNA against X-ray radiation

Details Role of clays in protecting adsorbed DNA against X-ray radiation Role of clays in protecting adsorbed DNA against X-ray radiation

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ijasb...3...31c&link_type=abstract

International Journal of Astrobiology, vol. 3, Issue 01, p.31-35

Biology

6

Clay Minerals, Clay Nucleic Acid Complexes, Origin Of Life, Surface Mediated Origin Of Genetic Material, X-Ray Irradiation Of Dna.

Scientific paper

We studied the effects of soft X-rays radiation on free and clay (montmorillonite, kaolinite) adsorbed DNA. The DNA samples were exposed to X-rays of 1.49, 4.51 and 8.04 keV for exposure times ranging from 2 min up to 16 h. The biological transformation technique was used to estimate the damage of the DNA molecules. Free and clay adsorbed DNA are differently affected by X-rays. The former is damaged by X-rays and the level of damage depends on the energy dose rather than the hardness of the radiation. The clay adsorbed DNA is not damaged by X-rays for energy doses up to 5.8×104 erg. Clays materials could have protected the building blocks of life on the primordial Earth when the solar X-ray emission was much stronger than today.

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