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. 2015 Aug 28;10(8):e0136956. doi: 10.1371/journal.pone.0136956

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© 2015 Uchiyama et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 7 — The four rare gases krypton (Kr), argon (Ar), neon (Ne), and helium (He) were used to generate cold atmospheric plasma. The amount of^. OH radicals formed (indicated by DMPO-OH adduct EPR signal) correlated inversely with the ionization energy of the gas. Represented data are the mean ± SD of three independent replicates.