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Perni, S, Shama, G, Hobman, J, Lund, P, Kershaw, C, Hidalgo-Arroyo, G, Penn, C, Deng, Xutao 
ORCID: 0000-0002-7372-3758, Walsh, J et al
(2007)
Probing bactericidal mechanisms induced by cold atmospheric plasma with Escherichia coli mutants.
Applied Physics Letters, 90
(7).
ISSN 0003-6951
Full text not available from this repository.
Official URL: https://doi.org/10.1063/1.2458162
Abstract
Mechanisms of plasma-induced microbial inactivation have commonly been studied with physicochemical techniques. In this letter, Escherichia coli K-12 and its ΔrecA
ΔrecA
, ΔrpoS
ΔrpoS
, and ΔsoxS
ΔsoxS
mutants are employed to discriminate effects of UV photons, OH radicals, and reactive oxygen species produced in atmospheric discharges. This microbiological approach exploits the fact that these E. coli mutants are defective in their resistance against various external stresses. By interplaying bacterial inactivation kinetics with optical emission spectroscopy, oxygen atoms are identified as a major contributor in plasma inactivation with minor contributions from UV photons, OH radicals, singlet oxygen metastables, and nitric oxide.
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