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Spatial Dependence of DNA Damage in Bacteria due to Low-Temperature Plasma Application as Assessed at the Single Cell Level

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JournalScientific Reports
DateSubmitted - 11 May 2016
DateAccepted/In press - 30 Sep 2016
DatePublished (current) - 19 Oct 2016
Volume6
Number of pages10
Original languageEnglish

Abstract

Low temperature plasmas (LTPs) generate a cocktail of reactive nitrogen and oxygen species (RNOS) with bactericidal activity. The RNOS however are spatially unevenly distributed in the plasma. Here we test the hypothesis that this distribution will affect the mechanisms underpinning plasma bactericidal activity focussing on the level of DNA damage in situ. For the first time, a quantitative, single cell approach was applied to assess the level of DNA damage in bacteria as a function of the radial distance from the centre of the plasma jet. Salmonella enterica on a solid, dry surface was treated with two types of LTP: an atmospheric-pressure dielectric barrier discharge plasma jet (charged and neutral species) and a radio-frequency atmospheric-pressure plasma jet (neutral species). In both cases, there was an inverse correlation between the degree of DNA damage and the radial distance from the centre of the plasma, with the highest DNA damage occurring directly under the plasma. This trend was also observed with Staphylococcus aureus. LTP-generated UV radiation was eliminated as a contributing factor. Thus valuable mechanistic information can be obtained from assays on biological material, which can inform the development of LTP as a complementary or alternative therapy for (topical) bacterial infections.

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© The Author(s) 2016

    Research areas

  • Anti-Bacterial Agents/pharmacology, DNA Damage, Microbial Viability/drug effects, Plasma Gases/pharmacology, Salmonella enterica/drug effects, Single-Cell Analysis, Spatial Analysis, Staphylococcus aureus/drug effects

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