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Sigmond, R. S.; Kurdelova, B.; Kurdel, M.

doi:10.1023/a:1022861403580

Cited by 16 publications

(4 citation statements)

References 4 publications

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“…On the other side, its main disadvantage is the action in limited area only with non‐uniform treatment. The properties of this type of discharge were also described by Sigmond et al16…”

Section: Introductionmentioning

confidence: 76%

The Microbicidal Effect of Low‐Temperature Plasma Generated by Corona Discharge: Comparison of Various Microorganisms on an Agar Surface or in Aqueous Suspension

Scholtz

Julák

Kříha

2010

Plasma Processes & Polymers

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The sensitivity of various microbes to the low temperature plasma generated by negative corona discharge in the point‐to‐plane mode was tested. On the surface of agar semisolid cultivation media, the inhibition zones in microbial cultures were obtained and their areas were compared as a measure of microbicidal effect for nine microbial species including bacterial spores and a yeast species. This experimental arrangement resembles the testing of antibiotic sensitivity by the well‐known disc diffusion technique. The effect of comparable magnitude was found for all vegetative forms, but Candida albicans and Deinococcus radiodurans appeared to be the most and Geobacillus stearothermophilus the least susceptible. The effect on spores was in order of magnitude lesser than on vegetative forms. Following the action of the same plasma on bacteria in aqueous suspensions, the complete sterilization of Escherichia coli was achieved within 120 s and Staphylococcus epidermidis within 4–5 min. On the other hand, the yeast Candida albicans in water appeared to be less susceptible requiring 30 min for its complete inactivation.

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“…On the other side, its main disadvantage is the action in limited area only with non‐uniform treatment. The properties of this type of discharge were also described by Sigmond et al16…”

Section: Introductionmentioning

confidence: 76%

The Microbicidal Effect of Low‐Temperature Plasma Generated by Corona Discharge: Comparison of Various Microorganisms on an Agar Surface or in Aqueous Suspension

Scholtz

Julák

Kříha

2010

Plasma Processes & Polymers

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“…Air plasmas at atmospheric pressure have the additional advantages of not requiring special gases and an easy application in ambient environment. Bio-decontamination by atmospheric air plasmas was tested in dc [7,12], dielectric barrier (DBD) [9,[13][14][15][16][17][18][19][20], RF [1] and pulsed discharges [8][9][10]15]. The plasmas can also be generated directly in water or at the water-air boundary [7,16,17,21,22], which is of considerable interest for water decontamination.…”

Section: Introductionmentioning

confidence: 99%

Plasma agents in bio-decontamination by dc discharges in atmospheric air

Machala¹,

Chladekova²,

Pelach³

2010

J. Phys. D: Appl. Phys.

130

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Bio-decontamination of water and surfaces contaminated by bacteria (Salmonella typhimurium) was investigated in two types of positive DC discharges in atmospheric pressure air, in needle-to-plane geometry: the streamer corona and its transition to a novel regime called transient spark with short high current pulses of limited energy. Both generate cold non-equilibrium plasma. Electro-spraying of the treated water through the needle electrode was applied for the first time and resulted in fast bio-decontamination. Experiments providing separation of various biocidal plasma agents, along with the emission spectra and coupled with oxidation stress measurements in the cell membranes helped better understanding of the mechanisms of microbial inactivation. The indirect exposure of contaminated surfaces to neutral active species was almost as efficient as the direct exposure to the plasma, whereas applying only UV radiation from the plasma had no biocidal effects. Radicals and reactive oxygen species were identified as dominant biocidal agents.

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“…Low electric current is passed to the second electrode realised by the grounded plane or a pinpoint. Depending on its polarity, voltage and geometry, various types of discharge are recognised: negative pulseless corona,22 negative glow corona,23 positive streamer corona and positive flashing corona24 for the point‐to‐plane arrangement; the various types of discharge were previously described by Trinh and Jan22 or Sigmond et al25 Recently, we described some properties of the point‐to‐point discharge 26. We also described a new type of discharge designed as ‘cometary’,27, 28 which may be considered as the special case of the bipolar point‐to‐point corona.…”

Section: Introductionmentioning

confidence: 99%

Inactivation of Prions Using Electrical DC Discharges at Atmospheric Pressure and Ambient Temperature

Julák

Janoušková

Scholtz

et al. 2011

Plasma Processes & Polymers

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The ability of DC discharges to inactivate infectious prions was studied using prion cell infectivity assays and direct Western blot analysis of abnormal prion protein. The negative corona discharge of the point-to-plane type significantly decreased prion infectivity of mouse RML scrapie brain homogenates within 20 min of exposure. The positive discharge treated liquids display persistent cidal effect, which kills the cell culture and makes it impossible to assess the presence of prions by the cell infectivity assay. The point-to-point and 'cometary' discharges exhibit only a low ability to inactivate infectious prions. As a possible mechanism of prion inactivation, the formation of insoluble and non-infective high molecular weight complexes is suggested.

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Cited by 16 publications

References 4 publications

The Microbicidal Effect of Low‐Temperature Plasma Generated by Corona Discharge: Comparison of Various Microorganisms on an Agar Surface or in Aqueous Suspension

The Microbicidal Effect of Low‐Temperature Plasma Generated by Corona Discharge: Comparison of Various Microorganisms on an Agar Surface or in Aqueous Suspension

Plasma agents in bio-decontamination by dc discharges in atmospheric air

Inactivation of Prions Using Electrical DC Discharges at Atmospheric Pressure and Ambient Temperature

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