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Absolute cross section for loss of supercoiled topology induced by 10 eV electrons in highly uniform /DNA/1,3-diaminopropane films deposited on highly ordered pyrolitic graphite

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      Resonant Formation of DNA Strand Breaks by Low-Energy (3 to 20 eV) Electrons

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        DNA strand breaks induced by 0-4 eV electrons: the role of shape resonances.

        Collisions of 0-4 eV electrons with thin DNA films are shown to produce single strand breaks. The yield is sharply structured as a function of electron energy and indicates the involvement of pi* shape resonances in the bond breaking process. The cross sections are comparable in magnitude to those observed in other compounds in the gas phase in which pi* electrons are transferred through the molecule to break a remote bond. The results therefore support aspects of a theoretical study by Barrios et al. [J. Phys. B 106, 7991 (2002)]] indicating that such a mechanism could produce strand breaks in DNA.
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          Heavy ion carcinogenesis and human space exploration.

          Before the human exploration of Mars or long-duration missions on the Earth's moon, the risk of cancer and other diseases from space radiation must be accurately estimated and mitigated. Space radiation, comprised of energetic protons and heavy nuclei, has been shown to produce distinct biological damage compared with radiation on Earth, leading to large uncertainties in the projection of cancer and other health risks, and obscuring evaluation of the effectiveness of possible countermeasures. Here, we describe how research in cancer radiobiology can support human missions to Mars and other planets.
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            Author and article information

            Journal
            The Journal of Chemical Physics
            The Journal of Chemical Physics
            AIP Publishing
            0021-9606
            1089-7690
            August 07 2013
            August 07 2013
            : 139
            : 5
            : 055104
            10.1063/1.4817323
            © 2013
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