Protection against radiation damage

The sample irradiated at — 196° C in the presence of air gave the same spectrum as that under vacuum. This sample, however, gave the spectrum characteristic of peroxy radicals at about — 68° C. An effect of oxygen on radical formation on irradiation with light of 300 nm was also reported (67). Protection against radiation damage in polymethylmethacrylate by ultraviolet light was also reported (98). 

Molecules such as melanin and DNA have fast rates of internal conversion, which means that they quickly arrive at the lowest vibration level of S from where they deexcite. Formation of triplet states, deformed molecules, or free radicals is avoided. Molecules of this sort protect against radiation damage, since they deexcite quickly, before harmful chemical reactions have taken place. 

Space-based solar ceUs are covered with a very thin layer of vitreous siHca to protect against the damaging environment of space such as atomic oxygen, micrometeorites, and radiation effects. Because the siHca is transparent to damaging uv radiation, it is normally coated with a uv-reflective thin film... 

Henderson, R. (1990). Cryo-protection of protein crystals against radiation damage in election and X-ray diffraction. Proc. R. Soc. Land. B 241, 6-8. 

The reason for this ban is the damage caused by CFCs to Earth s ozone layer. Ozone (O3) is a form of oxygen that filters out harmful radiation from the sun. When CFCs escape into the atmosphere, they attack and destroy ozone molecules. They reduce the protection against radiation provided by ozone. 

Therefore, it is likely that acclimation in these non adapted ferns depends chiefly on exacerbation of phenolics metabolism. TD formation in both species should be determined to assess the effectiveness of this protection against gene damage by enhanced UV-B radiation in the high habitats. 

W. Greenrod, C. S. Stockley, R Burcham, M. Abbey, M. Fenech (2005) Moderate acute intake of de-alcoholised red wine, but not alcohol, is protective against radiation-induced DNA damage ex vivo—Results of a comparative in vivo intervention study in younger men. Mutation Re-search/Fundamental and Molecular Mechanisms of Mutagenesis, 591, 290-301. 

Finally, protease inhibitors also appear to have the ability to protect against radiation-induced cell damage (Yavelow et al., 1983). 

Jagetia GC, Venkatesha VA, Reddy TK (2003) Naringin, a citrus flavonone, protects against radiation-induced chromosome damage in mouse bone marrow. Mutagenesis 18 337... 

Stoilov, L. M., Mullenders, L. H. F., and Natarajan, A. T, 1994, Caffeine potentiates or protects against radiation-induced DNA and chromosomal damage in human lymphocytes depending on temperature and concentration, Mutat. Res. 311 169-174. 

Hu P, Tirelli N (2012) Scavenging ROS superoxide dismutase/catalase mimetics by the use of an oxidation-sensitive nanocarrier/enzyme conjugate. Bioconjug Chem 23 438-449 Jena NR, Mishra PC, Suhai S (2009) Protection against radiation-induced DNA damage by amino acids a DPT study. J Phys Chem B 113 5633-5644... 

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