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Pignata C, D'Angelo D, Basso D, Cavallero MC, Beneventi S, Tartaro D, Meineri V, Gilli G. Low-temperature, low-pressure gas plasma application on Aspergillus brasiliensis, Escherichia coli and pistachios. J Appl Microbiol 2014; 116:1137-48. [PMID: 24443877 DOI: 10.1111/jam.12448] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 12/31/2013] [Accepted: 01/09/2014] [Indexed: 11/30/2022]
Abstract
AIM The aim of this study was to investigate the effect of plasma-enhanced chemical vapour deposition (PECVD) treatment on selected bacteria and spores and to contribute to the understanding of the synergistic effect of UV-directed plasma. METHODS AND RESULTS The experiments were conducted on pure cultures of Aspergillus brasiliensis and Escherichia coli and on naturally contaminated pistachios that were exposed to pure oxygen-, pure argon- and to a mixture of oxygen-argon-generated plasma for different treatment times and at different micro-organism concentrations. Optical emission spectroscopy (OES) measurements were performed to observe the active species in the plasma. After exposure, the effectiveness of decontamination was assessed through microbiological techniques by calculating the growth reduction on a logarithmic scale. A treatment time of 30 min resulted in a 3·5 log reduction of A. brasiliensis using pure oxygen or argon, while treatment times of 5 min, 1 min and 15 s resulted in a 5·4 log reduction using a mixture of argon and oxygen (10 : 1 v/v). Treatment times of 1 min and 30 s resulted in a 4 log reduction of E. coli with oxygen and argon, respectively, which led to a complete elimination of the micro-organisms. Two-log reductions of fungi were achieved for pistachios after a treatment time of 1 min. CONCLUSIONS These results suggest that this newly designed plasma reactor offers good potential applications for the reduction in micro-organisms on heat-sensitive materials, such as foods. The plasma that was generated with Ar/O2 was more effective than that which was generated with pure oxygen and pure argon. SIGNIFICANCE AND IMPACT OF THE STUDY An improvement in the knowledge about PECVD mechanisms was acquired from the chemical and biological points of view, and the suitability of the method for treating dry food surfaces was demonstrated.
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Affiliation(s)
- C Pignata
- Department of Public Health and Pediatrics, University of Torino, Torino, Italy
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252
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Tappi S, Berardinelli A, Ragni L, Dalla Rosa M, Guarnieri A, Rocculi P. Atmospheric gas plasma treatment of fresh-cut apples. INNOV FOOD SCI EMERG 2014. [DOI: 10.1016/j.ifset.2013.09.012] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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253
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Kim HJ, Yong HI, Park S, Kim K, Bae YS, Choe W, Oh MH, Jo C. Effect of Inactivating Salmonella Typhimurium in Raw Chicken Breast and Pork Loin Using an Atmospheric Pressure Plasma Jet. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2013. [DOI: 10.5187/jast.2013.55.6.545] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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254
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Julák J, Scholtz V. Decontamination of human skin by low-temperature plasma produced by cometary discharge. CLINICAL PLASMA MEDICINE 2013. [DOI: 10.1016/j.cpme.2013.09.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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255
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Hosseinzadeh Colagar A, Memariani H, Sohbatzadeh F, Valinataj Omran A. Nonthermal Atmospheric Argon Plasma Jet Effects on Escherichia coli Biomacromolecules. Appl Biochem Biotechnol 2013; 171:1617-29. [DOI: 10.1007/s12010-013-0430-9] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2012] [Accepted: 08/06/2013] [Indexed: 11/30/2022]
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256
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Abreu AC, Tavares RR, Borges A, Mergulhão F, Simões M. Current and emergent strategies for disinfection of hospital environments. J Antimicrob Chemother 2013; 68:2718-32. [PMID: 23869049 PMCID: PMC7109789 DOI: 10.1093/jac/dkt281] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A significant number of hospital-acquired infections occur due to inefficient disinfection of hospital surfaces, instruments and rooms. The emergence and wide spread of multiresistant forms of several microorganisms has led to a situation where few compounds are able to inhibit or kill the infectious agents. Several strategies to disinfect both clinical equipment and the environment are available, often involving the use of antimicrobial chemicals. More recently, investigations into gas plasma, antimicrobial surfaces and vapour systems have gained interest as promising alternatives to conventional disinfectants. This review provides updated information on the current and emergent disinfection strategies for clinical environments.
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Affiliation(s)
- Ana C Abreu
- LEPAE, Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
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257
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Stapelmann K, Fiebrandt M, Raguse M, Awakowicz P, Reitz G, Moeller R. Utilization of low-pressure plasma to inactivate bacterial spores on stainless steel screws. ASTROBIOLOGY 2013; 13:597-606. [PMID: 23768085 PMCID: PMC3713438 DOI: 10.1089/ast.2012.0949] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Accepted: 04/12/2013] [Indexed: 05/22/2023]
Abstract
A special focus area of planetary protection is the monitoring, control, and reduction of microbial contaminations that are detected on spacecraft components and hardware during and after assembly. In this study, wild-type spores of Bacillus pumilus SAFR-032 (a persistent spacecraft assembly facility isolate) and the laboratory model organism B. subtilis 168 were used to study the effects of low-pressure plasma, with hydrogen alone and in combination with oxygen and evaporated hydrogen peroxide as a process gas, on spore survival, which was determined by a colony formation assay. Spores of B. pumilus SAFR-032 and B. subtilis 168 were deposited with an aseptic technique onto the surface of stainless steel screws to simulate a spore-contaminated spacecraft hardware component, and were subsequently exposed to different plasmas and hydrogen peroxide conditions in a very high frequency capacitively coupled plasma reactor (VHF-CCP) to reduce the spore burden. Spores of the spacecraft isolate B. pumilus SAFR-032 were significantly more resistant to plasma treatment than spores of B. subtilis 168. The use of low-pressure plasma with an additional treatment of evaporated hydrogen peroxide also led to an enhanced spore inactivation that surpassed either single treatment when applied alone, which indicates the potential application of this method as a fast and suitable way to reduce spore-contaminated spacecraft hardware components for planetary protection purposes.
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Affiliation(s)
- Katharina Stapelmann
- Ruhr University Bochum (RUB), Institute for Electrical Engineering and Plasma Technology (AEPT), Bochum, Germany
| | - Marcel Fiebrandt
- Ruhr University Bochum (RUB), Institute for Electrical Engineering and Plasma Technology (AEPT), Bochum, Germany
| | - Marina Raguse
- German Aerospace Center (DLR), Institute of Aerospace Medicine, Radiation Biology Department, Cologne (Köln), Germany
| | - Peter Awakowicz
- Ruhr University Bochum (RUB), Institute for Electrical Engineering and Plasma Technology (AEPT), Bochum, Germany
| | - Günther Reitz
- German Aerospace Center (DLR), Institute of Aerospace Medicine, Radiation Biology Department, Cologne (Köln), Germany
| | - Ralf Moeller
- German Aerospace Center (DLR), Institute of Aerospace Medicine, Radiation Biology Department, Cologne (Köln), Germany
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258
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Kim JS, Lee EJ, Cho EA, Kim YJ. Inactivation of Campylobacter jejuni using Radio-frequency Atmospheric Pressure Plasma on Agar Plates and Chicken Hams. Korean J Food Sci Anim Resour 2013. [DOI: 10.5851/kosfa.2013.33.3.317] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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259
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260
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Amorim EOC, Tribst AAL, Augusto PED, Cristianini M. Inactivation of E. coli and B. subtilis spores in ozonized cassava starch. FOOD SCIENCE AND TECHNOLOGY 2013. [DOI: 10.1590/s0101-20612013005000043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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261
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262
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Galiş AM, Marcq C, Marlier D, Portetelle D, Van I, Beckers Y, Théwis A. Control ofSalmonellaContamination of Shell Eggs-Preharvest and Postharvest Methods: A Review. Compr Rev Food Sci Food Saf 2013. [DOI: 10.1111/1541-4337.12007] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Anca M. Galiş
- Univ. of Agronomical Sciences and Veterinary Medicine of Bucharest; Animal Science Unit; Bd. Mărăşti, no. 59, sector 1; Bucharest; 011464; Romania
| | - Christopher Marcq
- Univ. of Liege, Gembloux Agro-Bio Tech; Animal Science Unit. Passage des Déportés; 2, B-5030; Gembloux; Belgium
| | - Didier Marlier
- Univ. of Liege, Faculty of Veterinary Medicine; Dept. of Clinical Science, Clinic for Birds, Rabbits and Rodents; Boulevard de Colonster 20, B42; Sart-Tilman; B4000; Liege; Belgium
| | - Daniel Portetelle
- Univ. of Liege, Gembloux Agro-Bio Tech; Animal and Microbial Biology Unit.; Passage des Déportés, 2; B-5030; Gembloux; Belgium
| | - Ilie Van
- Univ. of Agronomical Sciences and Veterinary Medicine of Bucharest; Animal Science Unit; Bd. Mărăşti, no. 59, sector 1; Bucharest; 011464; Romania
| | - Yves Beckers
- Univ. of Liege, Gembloux Agro-Bio Tech; Animal Science Unit. Passage des Déportés; 2, B-5030; Gembloux; Belgium
| | - André Théwis
- Univ. of Liege, Gembloux Agro-Bio Tech; Animal Science Unit. Passage des Déportés; 2, B-5030; Gembloux; Belgium
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263
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Schlüter O, Ehlbeck J, Hertel C, Habermeyer M, Roth A, Engel KH, Holzhauser T, Knorr D, Eisenbrand G. Opinion on the use of plasma processes for treatment of foods*. Mol Nutr Food Res 2013; 57:920-7. [DOI: 10.1002/mnfr.201300039] [Citation(s) in RCA: 121] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Revised: 01/14/2013] [Accepted: 01/16/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Oliver Schlüter
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Jörg Ehlbeck
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Christian Hertel
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Michael Habermeyer
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Angelika Roth
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Karl-Heinz Engel
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Thomas Holzhauser
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Dietrich Knorr
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
| | - Gerhard Eisenbrand
- Department of Food Chemistry and Toxicology; University of Kaiserslautern; Kaiserslautern Germany
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264
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Sun ZW, Zhu JJ, Li ZS, Aldén M, Leipold F, Salewski M, Kusano Y. Optical diagnostics of a gliding arc. OPTICS EXPRESS 2013; 21:6028-6044. [PMID: 23482171 DOI: 10.1364/oe.21.006028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Dynamic processes in a gliding arc plasma generated between two diverging electrodes in ambient air driven by 31.25 kHz AC voltage were investigated using spatially and temporally resolved optical techniques. The life cycles of the gliding arc were tracked in fast movies using a high-speed camera with framing rates of tens to hundreds of kHz, showing details of ignition, motion, pulsation, short-cutting, and extinction of the plasma column. The ignition of a new discharge occurs before the extinction of the previous discharge. The developed, moving plasma column often short-cuts its current path triggered by Townsend breakdown between the two legs of the gliding arc. The emission from the plasma column is shown to pulsate at a frequency of 62.5 kHz, i.e., twice the frequency of the AC power supply. Optical emission spectra of the plasma radiation show the presence of excited N2, NO and OH radicals generated in the plasma and the dependence of their relative intensities on both the distance relative to the electrodes and the phase of the driving AC power. Planar laser-induced fluorescence of the ground-state OH radicals shows high intensity outside the plasma column rather than in the center suggesting that ground-state OH is not formed in the plasma column but in its vicinity.
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Affiliation(s)
- Z W Sun
- Division of Combustion Physics, Lund University, PO Box 118, S-221 00 Lund, Sweden
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265
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Joubert V, Cheype C, Bonnet J, Packan D, Garnier JP, Teissié J, Blanckaert V. Inactivation of Bacillus subtilis var. niger of both spore and vegetative forms by means of corona discharges applied in water. WATER RESEARCH 2013; 47:1381-1389. [PMID: 23286986 DOI: 10.1016/j.watres.2012.12.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2012] [Revised: 12/05/2012] [Accepted: 12/06/2012] [Indexed: 06/01/2023]
Abstract
Spores are dormant units of bacteria resistant to numerous disinfection methods. Additionally, the effects on bacteria of repetitive electrical discharges in water by used of the so-called "corona discharges" or streamer are poorly described. In this study vegetative and spore forms of Bacillus subtilis var. niger were subjected to these discharges. To generate corona discharges in water, a Marx generator capable of delivering 60-90 kV was used with a coaxial chamber of treatment. Vegetative and spore form reductions were defined using colony-forming unit counting. Proteins extracts were separated by two-dimensional electrophoresis and spots of interest were characterized by mass spectrometry. Shock waves were assessed by the diminution of liposome size and OD(400 nm). The results show a decrease in bacteria viability of 2 log(10) after 1000 discharges on the vegetative form and 4 log(10) after 10,000 discharges on the spores. Two-dimensional electrophoresis showed that the streamers impact the regulation of several proteins in the vegetative forms with UniProt ID: P80861, Q06797, P80244, C0ZI91, respectively. The reduction appears to be due, in part, to hydrogen peroxide (H(2)O(2)) generated by the corona discharges while spore deactivation remained insensitive to these chemicals. The spore eradication was associated to shock waves induced by the discharges but not H(2)O(2). Corona discharges appear as a prospective method for eradication of spores in water. The corona discharges can be an efficient method for decontamination processes of waste water.
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Affiliation(s)
- Vanessa Joubert
- CERPEM, Maison de la Technopole, 6 rue Léonard de Vinci, 53000 Laval, France.
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266
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Sung SJ, Huh JB, Yun MJ, Chang BMW, Jeong CM, Jeon YC. Sterilization effect of atmospheric pressure non-thermal air plasma on dental instruments. J Adv Prosthodont 2013; 5:2-8. [PMID: 23508991 PMCID: PMC3597921 DOI: 10.4047/jap.2013.5.1.2] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 12/27/2012] [Accepted: 02/08/2013] [Indexed: 11/08/2022] Open
Abstract
PURPOSE Autoclaves and UV sterilizers have been commonly used to prevent cross-infections between dental patients and dental instruments or materials contaminated by saliva and blood. To develop a dental sterilizer which can sterilize most materials, such as metals, rubbers, and plastics, the sterilization effect of an atmospheric pressure non-thermal air plasma device was evaluated. MATERIALS AND METHODS After inoculating E. coli and B. subtilis the diamond burs and polyvinyl siloxane materials were sterilized by exposing them to the plasma for different lengths of time (30, 60, 90, 120, 180 and, 240 seconds). The diamond burs and polyvinyl siloxane materials were immersed in PBS solutions, cultured on agar plates and quantified by counting the colony forming units. The data were analyzed using one-way ANOVA and significance was assessed by the LSD post hoc test (α=0.05). RESULTS The device was effective in killing E. coli contained in the plasma device compared with the UV sterilizer. The atmospheric pressure non-thermal air plasma device contributed greatly to the sterilization of diamond burs and polyvinyl siloxane materials inoculated with E. coli and B. subtilis. Diamond burs and polyvinyl siloxane materials inoculated with E. coli was effective after 60 and 90 seconds. The diamond burs and polyvinyl siloxane materials inoculated with B. subtilis was effective after 120 and 180 seconds. CONCLUSION The atmospheric pressure non-thermal air plasma device was effective in killing both E. coli and B. subtilis, and was more effective in killing E. coli than the UV sterilizer.
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Affiliation(s)
- Su-Jin Sung
- Department of Prosthodontics, School of Dentistry, Pusan National University, Yangsan, Republic of Korea
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267
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Plimpton SR, Gołkowski M, Mitchell DG, Austin C, Eaton SS, Eaton GR, Gołkowski C, Voskuil M. Remote delivery of hydroxyl radicals via secondary chemistry of a nonthermal plasma effluent. Biotechnol Bioeng 2013; 110:1936-44. [DOI: 10.1002/bit.24853] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 01/05/2013] [Accepted: 01/14/2013] [Indexed: 11/09/2022]
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268
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Park CW, Hwang J. Susceptibility constants of airborne bacteria to dielectric barrier discharge for antibacterial performance evaluation. JOURNAL OF HAZARDOUS MATERIALS 2013; 244-245:421-8. [PMID: 23274942 PMCID: PMC7117052 DOI: 10.1016/j.jhazmat.2012.12.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2012] [Revised: 11/30/2012] [Accepted: 12/01/2012] [Indexed: 05/21/2023]
Abstract
Dielectric barrier discharge (DBD) is a promising method to remove contaminant bioaerosols. The collection efficiency of a DBD reactor is an important factor for determining a reactor's removal efficiency. Without considering collection, simply defining the inactivation efficiency based on colony counting numbers for DBD as on and off may lead to overestimation of the inactivation efficiency of the DBD reactor. One-pass removal tests of bioaerosols were carried out to deduce the inactivation efficiency of the DBD reactor using both aerosol- and colony-counting methods. Our DBD reactor showed good performance for removing test bioaerosols for an applied voltage of 7.5 kV and a residence time of 0.24s, with η(CFU), η(Number), and η(Inactivation) values of 94%, 64%, and 83%, respectively. Additionally, we introduce the susceptibility constant of bioaerosols to DBD as a quantitative parameter for the performance evaluation of a DBD reactor. The modified susceptibility constant, which is the ratio of the susceptibility constant to the volume of the plasma reactor, has been successfully demonstrated for the performance evaluation of different sized DBD reactors under different DBD operating conditions. Our methodology will be used for design optimization, performance evaluation, and prediction of power consumption of DBD for industrial applications.
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Affiliation(s)
- Chul Woo Park
- School of Mechanical Engineering, Yonsei University, Seoul 120-749, Republic of Korea
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269
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Preis S, Klauson D, Gregor A. Potential of electric discharge plasma methods in abatement of volatile organic compounds originating from the food industry. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2013; 114:125-38. [PMID: 23238056 DOI: 10.1016/j.jenvman.2012.10.042] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2012] [Revised: 08/24/2012] [Accepted: 10/18/2012] [Indexed: 05/23/2023]
Abstract
Increased volatile organic compounds emissions and commensurate tightening of applicable legislation mean that the development and application of effective, cost-efficient abatement methods are areas of growing concern. This paper reviews the last two decades' publications on organic vapour emissions from food processing, their sources, impacts and treatment methods. An overview of the latest developments in conventional air treatment methods is presented, followed by the main focus of the paper, non-thermal plasma technology. The results of the review suggest that non-thermal plasma technology, in its pulsed corona discharge configuration, is an emerging treatment method with potential for low-cost, effective abatement of a wide spectrum of organic air pollutants. It is found that the combination of plasma treatment with catalysis is a development trend that demonstrates considerable potential. The as yet relatively small number of plasma treatment applications is considered to be due to the novelty of pulsed electric discharge techniques and a lack of reliable pulse generators and reactors. Other issues acting as barriers to widespread adoption of the technique include the possible formation of stable oxidation by-products, residual ozone and nitrogen oxides, and sensitivity towards air humidity.
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Affiliation(s)
- S Preis
- LUT Chemistry, Lappeenranta University of Technology, P.O. Box 20, 53851 Lappeenranta, Finland
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270
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Ziuzina D, Patil S, Cullen P, Keener K, Bourke P. Atmospheric cold plasma inactivation of Escherichia coli
in liquid media inside a sealed package. J Appl Microbiol 2013. [DOI: 10.1111/jam.12087] [Citation(s) in RCA: 175] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Ziuzina
- School of Food Science and Environmental Health; Dublin Institute of Technology; Dublin Ireland
| | - S. Patil
- School of Food Science and Environmental Health; Dublin Institute of Technology; Dublin Ireland
| | - P.J. Cullen
- School of Food Science and Environmental Health; Dublin Institute of Technology; Dublin Ireland
| | - K.M. Keener
- Purdue University, Nelson Hall of Food Science; West Lafayette IN USA
| | - P. Bourke
- School of Food Science and Environmental Health; Dublin Institute of Technology; Dublin Ireland
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271
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Attri P, Arora B, Choi EH. Retracted Article: Utility of plasma: a new road from physics to chemistry. RSC Adv 2013. [DOI: 10.1039/c3ra41277f] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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272
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273
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Boonduang S, Limsuwan P. Effect of Generating Heat on Ozone Generation in Dielectric Cylinder-Cylinder DBD Ozone Generator. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/epe.2013.59057] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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274
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Massier S, Bouffartigues E, Rincé A, Maillot O, Feuilloley MGJ, Orange N, Chevalier S. Effects of a pulsed light-induced stress on Enterococcus faecalis. J Appl Microbiol 2012; 114:186-95. [PMID: 23035907 DOI: 10.1111/jam.12029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 09/16/2012] [Accepted: 09/25/2012] [Indexed: 01/28/2023]
Abstract
AIMS Pulsed light (PL) technology is a surface decontamination process that can be used on food, packaging or water. PL efficiency may be limited by its low degree of penetration or because of a shadow effect. In these cases, surviving bacteria will be able to perceive PL as a stress. Such a stress was mimicked using low transmitted energy conditions, and its effects were investigated on the highly environmental adaptable bacterium Enterococcus faecalis V583. METHODS AND RESULTS In these laboratory conditions, a complete decontamination of the artificially inoculated medium was performed using energy doses as low as 1.8 J cm(-2) , while a treatment of 0.5, 1 and 1.2 J cm(-2) led to a 2.2, 6 and 7-log(10) CFU ml(-1) reduction in the initial bacterial population, respectively. Application of a 0.5 J cm(-2) pretreatment allowed the bacteria to resist more efficiently a 1.2 J cm(-2) subsequent PL dose. This 0.5 J cm(-2) treatment increased the bacterial mutation frequency and affected the abundance of 19 proteins as revealed by a global proteome analysis. CONCLUSIONS Enterococcus faecalis is able to adapt to a PL treatment, providing a molecular response to low-energy PL dose, leading to enhanced resistance to a subsequent treatment and increasing the mutation frequency. SIGNIFICANCE AND IMPACT OF THE STUDY This study gives further insights on Ent. faecalis capacities to adapt and to resist to stress.
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Affiliation(s)
- S Massier
- LMSM, Laboratoire de Microbiologie-Signaux et Microenvironnement, EA 4312, Université de Rouen, Evreux, France
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275
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Fröhling A, Durek J, Schnabel U, Ehlbeck J, Bolling J, Schlüter O. Indirect plasma treatment of fresh pork: Decontamination efficiency and effects on quality attributes. INNOV FOOD SCI EMERG 2012. [DOI: 10.1016/j.ifset.2012.09.001] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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276
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Fricke K, Koban I, Tresp H, Jablonowski L, Schröder K, Kramer A, Weltmann KD, von Woedtke T, Kocher T. Atmospheric pressure plasma: a high-performance tool for the efficient removal of biofilms. PLoS One 2012; 7:e42539. [PMID: 22880025 PMCID: PMC3412829 DOI: 10.1371/journal.pone.0042539] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 07/09/2012] [Indexed: 11/24/2022] Open
Abstract
Introduction The medical use of non-thermal physical plasmas is intensively investigated for sterilization and surface modification of biomedical materials. A further promising application is the removal or etching of organic substances, e.g., biofilms, from surfaces, because remnants of biofilms after conventional cleaning procedures are capable to entertain inflammatory processes in the adjacent tissues. In general, contamination of surfaces by micro-organisms is a major source of problems in health care. Especially biofilms are the most common type of microbial growth in the human body and therefore, the complete removal of pathogens is mandatory for the prevention of inflammatory infiltrate. Physical plasmas offer a huge potential to inactivate micro-organisms and to remove organic materials through plasma-generated highly reactive agents. Method In this study a Candida albicans biofilm, formed on polystyrene (PS) wafers, as a prototypic biofilm was used to verify the etching capability of the atmospheric pressure plasma jet operating with two different process gases (argon and argon/oxygen mixture). The capability of plasma-assisted biofilm removal was assessed by microscopic imaging. Results The Candida albicans biofilm, with a thickness of 10 to 20 µm, was removed within 300 s plasma treatment when oxygen was added to the argon gas discharge, whereas argon plasma alone was practically not sufficient in biofilm removal. The impact of plasma etching on biofilms is localized due to the limited presence of reactive plasma species validated by optical emission spectroscopy.
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Affiliation(s)
- Katja Fricke
- Leibniz Institute for Plasma Science and Technology eV, INP Greifswald, Greifswald, Germany.
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Lee HJ, Jung S, Jung HS, Park SH, Choe WH, Ham JS, Jo C. Evaluation of a Dielectric Barrier Discharge Plasma System for Inactivating Pathogens on Cheese Slices. JOURNAL OF ANIMAL SCIENCE AND TECHNOLOGY 2012. [DOI: 10.5187/jast.2012.54.3.191] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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278
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Ermolaeva SA, Sysolyatina EV, Kolkova NI, Bortsov P, Tuhvatulin AI, Vasiliev MM, Mukhachev AY, Petrov OF, Tetsuji S, Naroditsky BS, Morfill GE, Fortov VE, Grigoriev AI, Zigangirova NA, Gintsburg AL. Non-thermal argon plasma is bactericidal for the intracellular bacterial pathogen Chlamydia trachomatis. J Med Microbiol 2012; 61:793-799. [DOI: 10.1099/jmm.0.038117-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Svetlana A. Ermolaeva
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Elena V. Sysolyatina
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Natalia I. Kolkova
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Petr Bortsov
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Amir I. Tuhvatulin
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Mikhail M. Vasiliev
- Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | - Andrey Y. Mukhachev
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Oleg F. Petrov
- Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | - Shimizu Tetsuji
- Max Planck Institute for Extraterrestrial Physics, Munich, Germany
| | - Boris S. Naroditsky
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | | | - Vladimir E. Fortov
- Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | | | - Nelly A. Zigangirova
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
| | - Alexander L. Gintsburg
- Gamaleya Research Institute of Epidemiology and Microbiology, Ministry of Health and Social Development of Russian Federation, Moscow, Russia
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Liang Y, Wu Y, Sun K, Chen Q, Shen F, Zhang J, Yao M, Zhu T, Fang J. Rapid inactivation of biological species in the air using atmospheric pressure nonthermal plasma. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:3360-8. [PMID: 22385302 DOI: 10.1021/es203770q] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Here, nonthermal plasma generated by a dielectric barrier discharge (DBD) system was applied to inactivating aerosolized Bacillus subtilis cells and Pseudomonas fluorescens as well as indoor and outdoor bioaerosols. The culturability, viability, and diversity losses of the microorganisms in air samples treated by the plasma for 0.06-0.12 s were studied using culturing, DNA stain as well as polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) methods. In addition, the viable fraction of bacterial aerosols with and without the plasma treatment was also quantified using qPCR coupled with ethidium monoazide (EMA). It was shown that less than 2% of B. subtilis aerosols survived the plasma treatment of 0.12 s, while none of the P. fluorescens aerosols survived. Viability tests, EMA-qPCR results, and Scanning Electron Microscopy (SEM) images demonstrated that both bacterial species suffered significant viability loss, membrane, and DNA damages. Exposure of environmental bacterial and fungal aerosols to the plasma for 0.06 s also resulted in their significant inactivations, more than 95% for bacteria and 85-98% for fungal species. PCR-DGGE analysis showed that plasma exposure of 0.06 s resulted in culturable bacterial aerosol diversity loss for both environments, especially pronounced for indoor environment. The results here demonstrate that nonthermal plasma exposure could offer a highly efficient air decontamination technology.
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Affiliation(s)
- Yongdong Liang
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, China
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281
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HATI SUBROTA, MANDAL SURAJIT, VIJ SHILPA, MINZ P, BASU SANDIP, KHETRA YOGESH, YADAV DEEPIKA, DAHIYA MINAKSHI. NONTHERMAL PLASMA TECHNOLOGY AND ITS POTENTIAL APPLICATIONS AGAINST FOODBORNE MICROORGANISMS. J FOOD PROCESS PRES 2012. [DOI: 10.1111/j.1745-4549.2011.00619.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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283
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Massier S, Rincé A, Maillot O, Feuilloley MGJ, Orange N, Chevalier S. Adaptation of Pseudomonas aeruginosa to a pulsed light-induced stress. J Appl Microbiol 2012; 112:502-11. [PMID: 22188372 DOI: 10.1111/j.1365-2672.2011.05224.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS Pulsed light (PL) technology is an efficient surface decontamination process. Used in low transmitted energy conditions, PL induces a stress that can be perceived by bacteria. The effect of such a PL stress was investigated on the highly environmental adaptable germ Pseudomonas aeruginosa PAO1. METHODS AND RESULTS Pulses of transmitted energy (fluence) reaching 1·8Jcm(-2) can kill 10(9) bacteria. Application of a lower sublethal PL dose allowed the bacteria to resist and survive more efficiently to a subsequent dose of PL. This sublethal dose was not increasing the mutation frequency of Ps. aeruginosa, but altered the abundance of 15 proteins as revealed by a global proteome analysis, including stress-induced proteins, phage-related proteins, energy and carbon metabolisms, cell motility, and transcription and translation regulators. CONCLUSIONS A response to a low-energy PL dose takes place in Ps. aeruginosa, reducing the energy conversion systems, while increasing transcription and translation processes to produce proteins involved in chaperone mechanisms and phage-related proteins, probably to protect the bacterium against a new PL-induced stress. SIGNIFICANCE AND IMPACT OF THE STUDY Taken together, these results suggest that a low-energy PL dose is sufficient to provoke adaptation of Ps. aeruginosa, leading to enhancing its resistance to a subsequent lethal treatment.
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Affiliation(s)
- S Massier
- LMDF-SME, Laboratoire de Microbiologie du Froid-Signaux et Micro-Environnement, EA 4312, Université de Rouen, Rouen, France
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Nonthermal atmospheric plasma rapidly disinfects multidrug-resistant microbes by inducing cell surface damage. Antimicrob Agents Chemother 2012; 56:2028-36. [PMID: 22232292 DOI: 10.1128/aac.05642-11] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Plasma, a unique state of matter with properties similar to those of ionized gas, is an effective biological disinfectant. However, the mechanism through which nonthermal or "cold" plasma inactivates microbes on surfaces is poorly understood, due in part to challenges associated with processing and analyzing live cells on surfaces rather than in aqueous solution. Here, we employ membrane adsorption techniques to visualize the cellular effects of plasma on representative clinical isolates of drug-resistant microbes. Through direct fluorescent imaging, we demonstrate that plasma rapidly inactivates planktonic cultures, with >5 log(10) kill in 30 s by damaging the cell surface in a time-dependent manner, resulting in a loss of membrane integrity, leakage of intracellular components (nucleic acid, protein, ATP), and ultimately focal dissolution of the cell surface with longer exposure time. This occurred with similar kinetic rates among methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, and Candida albicans. We observed no correlative evidence that plasma induced widespread genomic damage or oxidative protein modification prior to the onset of membrane damage. Consistent with the notion that plasma is superficial, plasma-mediated sterilization was dramatically reduced when microbial cells were enveloped in aqueous buffer prior to treatment. These results support the use of nonthermal plasmas for disinfecting multidrug-resistant microbes in environmental settings and substantiate ongoing clinical applications for plasma devices.
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285
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Knorr D, Froehling A, Jaeger H, Reineke K, Schlueter O, Schoessler K. Emerging technologies in food processing. Annu Rev Food Sci Technol 2012; 2:203-35. [PMID: 22129381 DOI: 10.1146/annurev.food.102308.124129] [Citation(s) in RCA: 219] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
High hydrostatic pressure (HHP), pulsed electric fields (PEFs), ultrasound (US), and cold plasma (CP) are emerging technologies that have already found application in the food industry or related sectors. This review aims to describe the basic principles of these nonthermal technologies as well as the state of the art concerning their impact on biological cells, enzymes, and food constituents. Current and potential applications will be discussed, focusing on process-structure-function relationships, as well as recent advances in the process development.
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Affiliation(s)
- D Knorr
- Berlin University of Technology, Department of Food Biotechnology and Food Process Engineering, D-14195 Berlin, Germany.
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286
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Fröhling A, Baier M, Ehlbeck J, Knorr D, Schlüter O. Atmospheric pressure plasma treatment of Listeria innocua and Escherichia coli at polysaccharide surfaces: Inactivation kinetics and flow cytometric characterization. INNOV FOOD SCI EMERG 2012. [DOI: 10.1016/j.ifset.2011.11.002] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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287
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Boonduang S, Limsuwan S, Kongsri W, Limsuwan P. Effect of Oxygen Pressure and Flow Rate on Electrical Characteristic and Ozone Concentration of a Cylinder-Cylinder DBD Ozone Generator. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.proeng.2012.02.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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288
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Berardinelli A, Vannini L, Ragni L, Guerzoni ME. Impact of Atmospheric Plasma Generated by a DBD Device on Quality-Related Attributes of “Abate Fetel” Pear Fruit. PLASMA FOR BIO-DECONTAMINATION, MEDICINE AND FOOD SECURITY 2012. [DOI: 10.1007/978-94-007-2852-3_35] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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289
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Soušková H, Scholtz V, Julák J, Savická D. The Fungal Spores Survival Under the Low-Temperature Plasma. PLASMA FOR BIO-DECONTAMINATION, MEDICINE AND FOOD SECURITY 2012. [DOI: 10.1007/978-94-007-2852-3_5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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290
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Lademann J, Richter H, Schanzer S, Patzelt A, Thiede G, Kramer A, Weltmann KD, Hartmann B, Lange-Asschenfeldt B. Comparison of the Antiseptic Efficacy of Tissue-Tolerable Plasma and an Octenidine Hydrochloride-Based Wound Antiseptic on Human Skin. Skin Pharmacol Physiol 2012; 25:100-6. [DOI: 10.1159/000335558] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Accepted: 12/06/2011] [Indexed: 11/19/2022]
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291
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Cold atmospheric pressure plasma treatment of ready-to-eat meat: inactivation of Listeria innocua and changes in product quality. Food Microbiol 2011; 30:233-8. [PMID: 22265306 DOI: 10.1016/j.fm.2011.12.018] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 12/13/2011] [Accepted: 12/16/2011] [Indexed: 11/23/2022]
Abstract
The application of cold atmospheric pressure plasma for decontamination of a sliced ready-to-eat (RTE) meat product (bresaola) inoculated with Listeria innocua was investigated. Inoculated samples were treated at 15.5, 31, and 62 W for 2-60 s inside sealed linear-low-density-polyethylene bags containing 30% oxygen and 70% argon. Treatments resulted in a reduction of L. innocua ranging from 0.8 ± 0.4 to 1.6 ± 0.5 log cfu/g with no significant effects of time and intensity while multiple treatments at 15.5 and 62 W of 20 s with a 10 min interval increased reduction of L. innocua with increasing number of treatments. Concentrations of thiobarbituric acid reactive substances (TBARS) increased with power, treatments and storage time and were significantly higher than those of control samples after 1 and 14 days of storage at 5 °C. However, the levels were low (from 0.1 to 0.4 mg/kg) and beneath the sensory threshold level. Surface colour changes included loss of redness of ∼40% and 70% after 1 and 14 days of storage, respectively, regardless of plasma treatment. The results indicate that plasma may be applicable in surface decontamination of pre-packed RTE food products. However, oxidation may constitute an issue in some products.
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292
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Dobrynin D, Friedman G, Fridman A, Starikovskiy A. Inactivation of bacteria using dc corona discharge: role of ions and humidity. NEW JOURNAL OF PHYSICS 2011; 13:103033. [PMID: 22403515 PMCID: PMC3295596 DOI: 10.1088/1367-2630/13/10/103033] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Here we present the results of an experimental study of the effect of ions produced in a dc corona discharge on inactivation of bacteria on the surface of agarose gel. Both positive and negative corona discharges in various gases at different humidities were studied. The measurements in air, O(2), N(2), Ar and He mixtures show that there is no inactivation in pure N(2), pure O(2) and an N(2)-H(2)O mixture. The best results were achieved in the case of direct treatment, when discharge was ignited in oxygen and water-containing mixtures. We show that neither UV radiation, ozone or H(2)O(2) nor other neutral active species alone produced by corona have an effect on bacteria viability. It is shown that the main role of charged particles may be related to the faster transport of active peroxide species-cluster ions OH(-)(H(2)O)(n) and H(3)O(+)(H(2)O)(n). The efficiency of these radicals is much higher than that of the oxygen radicals and ions (including [Formula: see text] and O(3)) and that of nitrogen and argon ions.
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Affiliation(s)
- Danil Dobrynin
- Electrical and Computer Engineering Department, College of Engineering, Drexel University, USA
| | - Gary Friedman
- Electrical and Computer Engineering Department, College of Engineering, Drexel University, USA
| | - Alexander Fridman
- Department of Mechanical Engineering and Mechanics, College of Engineering, Drexel University, PA, USA
| | - Andrey Starikovskiy
- Department of Mechanical Engineering and Mechanics, College of Engineering, Drexel University, PA, USA
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293
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Julák J, Scholtz V, Kotúčová S, Janoušková O. The persistent microbicidal effect in water exposed to the corona discharge. Phys Med 2011; 28:230-9. [PMID: 21925912 DOI: 10.1016/j.ejmp.2011.08.001] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 06/06/2011] [Accepted: 08/10/2011] [Indexed: 10/17/2022] Open
Abstract
This article describes and particularly explains a new phenomenon of persistent microbicidal effect of water previously exposed to the low-temperature plasma, which cannot be attributed to the acidification only. The direct microbicidal action of plasma is well documented, being mediated by number of reactive particles with a short lifetime. However, we observed the microbicidal effect also in exposed water stored for a month, where it must be mediated by stable particles. In water and in phosphate-buffered saline, the formation of NO(x) and corresponding acids, H(2)O(2) and O(3) was confirmed after exposition to the low-temperature plasma generated in air by DC negative glow corona and positive streamer discharge. The time course of acidification, H(2)O(2) and O(3) formation were deremined. Except uncertain traces of HCN, SIFT-MS analysis of exposed liquids reveals no additional reactive compounds. The microbicidal effect persists almost unchanged during 4 weeks of storage, although O(3) completely and H(2)O(2) almost disappears. Staphylococcus epidermidis and Escherichia coli were inactivated within 10 min of incubation in exposed liquids, Candida albicans needs at least 1 h. The solutions prepared by artificial mixing of reactive compounds mimic the action of exposed water, but in lesser extent. The acid milieu is the main cause of the microbicidal effect, but the possibility of still unidentified additional compound remains open.
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Affiliation(s)
- Jaroslav Julák
- Institute of Immunology and Microbiology, First Faculty of Medicine, Charles University in Prague, Studničkova 7, 128 00 Praha 2, Czech Republic.
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294
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Li K, Tang X, Yi H, Ning P, Song J, Wang J. Mechanism of Catalytic Oxidation of NO over Mn–Co–Ce–Ox Catalysts with the Aid of Nonthermal Plasma at Low Temperature. Ind Eng Chem Res 2011. [DOI: 10.1021/ie200957w] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kai Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Xiaolong Tang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Honghong Yi
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Jinghao Song
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Jiangen Wang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
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295
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Lademann O, Kramer A, Richter H, Patzelt A, Meinke MC, Czaika V, Weltmann KD, Hartmann B, Koch S. Skin disinfection by plasma-tissue interaction: comparison of the effectivity of tissue-tolerable plasma and a standard antiseptic. Skin Pharmacol Physiol 2011; 24:284-8. [PMID: 21709431 DOI: 10.1159/000329913] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Accepted: 04/30/2011] [Indexed: 11/19/2022]
Abstract
Wound healing disorders frequently occur due to biofilm formation on wound surfaces requiring conscientious wound hygiene. Often, the application of conventional liquid antiseptics is not sufficient and sustainable as (1) the borders and the surrounding of chronic wounds frequently consist of sclerotic skin, impeding an effectual penetration of these products, and (2) the hair follicles representing the reservoir for bacterial recolonization of skin surfaces are not affected. Recently, it has been reported that tissue-tolerable plasma (TTP), which is used at a temperature range between 35 and 45°C, likewise has disinfecting properties. In the present study, the effectivity of TTP and a standard liquid antiseptic was compared in vitro on porcine skin. The results revealed that TTP was able to reduce the bacterial load by 94%, although the application of the liquid antiseptic remained superior as it reduced the bacteria by almost 99%. For in vivo application, however, TTP offers several advantages. On the one hand, TTP enables the treatment of sclerotic skin as well, and on the other hand, a sustainable disinfection can be realized as, obviously, also the follicular reservoir is affected by TTP.
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Affiliation(s)
- O Lademann
- Institute of Hygiene, University of Greifswald, Germany. olaflademann @ yahoo.de
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296
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Weng CC, Liao JD, Chen HH, Lin TY, Huang CL. Capillary-tube-based oxygen/argon micro-plasma system for the inactivation of bacteria suspended in aqueous solution. Int J Radiat Biol 2011; 87:936-43. [PMID: 21591976 DOI: 10.3109/09553002.2011.577503] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
PURPOSE An aqueous solution containing Escherichia coli can be completely inactivated within a short treatment time using a capillary-tube-based oxygen/argon micro-plasma source. MATERIALS AND METHODS A capillary-tube-based oxygen/argon micro-plasma system with a hollow inner electrode was ignited by a 13.56 MHz radio frequency power supply with a matching network and characterised by optical emission spectroscopy. An aqueous solution containing E. coli was then treated at various the working distances, plasma exposure durations, and oxygen ratios in argon micro-plasma. The treated bacteria were then assessed and qualitatively investigated. The morphologies of treated bacteria were examined using a scanning electron microscope (SEM). RESULTS In the proposed oxygen/argon micro-plasma system, the intensities of the main emission lines of the excited species, nitric oxide (NO), hydrated oxide (OH), argon (Ar), and atomic oxygen (O), fluctuated with the addition of oxygen to argon micro-plasma. Under a steady state of micro-plasma generation, the complete inactivation of E. coli in aqueous solution was achieved within 90 s of argon micro-plasma exposure time with a working distance of 3 mm. SEM micrographs reveal obvious morphological damage to the treated E. coli. The addition of oxygen to argon micro-plasma increased the variety of O-containing excited species. At a given supply power, the relative intensities of the excited species, NO and OH, correlated with the ultraviolet (UV) intensity, decreased. CONCLUSION For the proposed capillary-tube-based micro-plasma system with a hollow inner electrode, the oxygen/argon micro-plasma source is efficient in inactivating E. coli in aqueous solution. The treatment time required for the inactivation process decreases with decreasing working distance or the increasing synthesised effect of reactive species and UV intensity.
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Affiliation(s)
- Chih-Chiang Weng
- Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan
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297
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Heinlin J, Isbary G, Stolz W, Morfill G, Landthaler M, Shimizu T, Steffes B, Nosenko T, Zimmermann J, Karrer S. Plasma applications in medicine with a special focus on dermatology. J Eur Acad Dermatol Venereol 2011; 25:1-11. [PMID: 20497290 DOI: 10.1111/j.1468-3083.2010.03702.x] [Citation(s) in RCA: 172] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The recent tremendous progress in understanding physical plasma phenomenon, together with the development of new plasma sources has put growing focus on the application of plasmas in health care. Active plasma components, such as molecules, atoms, ions, electrons and photons, reactive species, ultraviolet radiation, optical and infrared emission and heat have the ability of activating, controlling and catalysing reactions and complex biochemical procedures. Thermal and non-thermal (i.e. cold) plasmas - both already widely established in medicine - are used for various therapeutic applications. Particularly in dermatology, plasma applications hold big potential, for example, in wound healing, such as efficient disinfection or sterilization, therapy of various skin infections or tissue regeneration. This review gives an overview on potential plasma applications in medicine - including the recent research on skin diseases - and summarizes possible interactions between plasmas and living tissue.
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Affiliation(s)
- J Heinlin
- Department of Dermatology, University of Regensburg, Germany
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298
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Muranyi P, Wunderlich J, Langowski HC. Modification of bacterial structures by a low-temperature gas plasma and influence on packaging material. J Appl Microbiol 2011; 109:1875-85. [PMID: 20649834 DOI: 10.1111/j.1365-2672.2010.04815.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To investigate the effect of a cascaded dielectric barrier discharge (CDBD) treatment on the biological structure of a selected bacterium and on the properties of different polymer films. METHODS AND RESULTS Inactivation kinetics were measured using air as the process gas and using Bacillus atrophaeus spores and vegetative cells, which had been homogeneously distributed on a surface. The changes to the outer coats and the DNA of the endospores and cells after plasma treatment were determined using biomolecular and chemical methods. The experiments showed that damage to the DNA molecules and changes in the cell walls can be observed as a consequence of the CDBD treatment. Furthermore, the influence of the plasma treatment on the properties of various polymer films was investigated using a variety of test methods. Except the sealing strength where a slight decrease was observed (max. 20%), no negative changes of the material properties have occurred. CONCLUSIONS CDBD treatment can affect the DNA of spores and cells, depending on the treatment time. At the same time, practically relevant inactivation rates on packaging materials were observed, without any significant changes to the material properties. SIGNIFICANCE AND IMPACT OF THE STUDY Knowledge about CDBD mechanisms was acquired from a biological point of view, and the suitability of the method for treating polymer films was demonstrated.
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Affiliation(s)
- P Muranyi
- Fraunhofer Institute for Process Engineering and Packaging IVV, Freising, Germany.
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Soušková H, Scholtz V, Julák J, Kommová L, Savická D, Pazlarová J. The survival of micromycetes and yeasts under the low-temperature plasma generated in electrical discharge. Folia Microbiol (Praha) 2011; 56:77-9. [PMID: 21399943 DOI: 10.1007/s12223-011-0005-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2010] [Accepted: 10/27/2010] [Indexed: 11/29/2022]
Abstract
The fungicidal effect of low-temperature plasma generated by positive direct current discharge and its influence on the growth dynamics was evaluated on three micromycete species and yeast in water suspensions. The fungicidal effect was lower than analogous bactericidal effect and differs substantially among various fungal species. Together with the cidal effects, the slower growth of exposed fungal spores was observed.
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Affiliation(s)
- H Soušková
- Department of Computing and Control Engineering, Faculty of Chemical Engineering, Institute of Chemical Technology in Prague, 166 28, Prague, Czech Republic
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300
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Ermolaeva SA, Varfolomeev AF, Chernukha MY, Yurov DS, Vasiliev MM, Kaminskaya AA, Moisenovich MM, Romanova JM, Murashev AN, Selezneva II, Shimizu T, Sysolyatina EV, Shaginyan IA, Petrov OF, Mayevsky EI, Fortov VE, Morfill GE, Naroditsky BS, Gintsburg AL. Bactericidal effects of non-thermal argon plasma in vitro, in biofilms and in the animal model of infected wounds. J Med Microbiol 2011; 60:75-83. [DOI: 10.1099/jmm.0.020263-0] [Citation(s) in RCA: 260] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Non-thermal (low-temperature) physical plasma is under intensive study as an alternative approach to control superficial wound and skin infections when the effectiveness of chemical agents is weak due to natural pathogen or biofilm resistance. The purpose of this study was to test the individual susceptibility of pathogenic bacteria to non-thermal argon plasma and to measure the effectiveness of plasma treatments against bacteria in biofilms and on wound surfaces. Overall, Gram-negative bacteria were more susceptible to plasma treatment than Gram-positive bacteria. For the Gram-negative bacteria Pseudomonas aeruginosa, Burkholderia cenocepacia and Escherichia coli, there were no survivors among the initial 105 c.f.u. after a 5 min plasma treatment. The susceptibility of Gram-positive bacteria was species- and strain-specific. Streptococcus pyogenes was the most resistant with 17 % survival of the initial 105 c.f.u. after a 5 min plasma treatment. Staphylococcus aureus had a strain-dependent resistance with 0 and 10 % survival from 105 c.f.u. of the Sa 78 and ATCC 6538 strains, respectively. Staphylococcus epidermidis and Enterococcus faecium had medium resistance. Non-ionized argon gas was not bactericidal. Biofilms partly protected bacteria, with the efficiency of protection dependent on biofilm thickness. Bacteria in deeper biofilm layers survived better after the plasma treatment. A rat model of a superficial slash wound infected with P. aeruginosa and the plasma-sensitive Staphylococcus aureus strain Sa 78 was used to assess the efficiency of argon plasma treatment. A 10 min treatment significantly reduced bacterial loads on the wound surface. A 5-day course of daily plasma treatments eliminated P. aeruginosa from the plasma-treated animals 2 days earlier than from the control ones. A statistically significant increase in the rate of wound closure was observed in plasma-treated animals after the third day of the course. Wound healing in plasma-treated animals slowed down after the course had been completed. Overall, the results show considerable potential for non-thermal argon plasma in eliminating pathogenic bacteria from biofilms and wound surfaces.
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Affiliation(s)
- Svetlana A. Ermolaeva
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Alexander F. Varfolomeev
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Marina Yu. Chernukha
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Dmitry S. Yurov
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Mikhail M. Vasiliev
- Joint Institute of High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | - Anastasya A. Kaminskaya
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | | | - Julia M. Romanova
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Arcady N. Murashev
- Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Pushchino, Russia
| | - Irina I. Selezneva
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russia
| | - Tetsuji Shimizu
- Max Planck Institute for Extraterrestrial Physics, Munich, Germany
| | - Elena V. Sysolyatina
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Igor A. Shaginyan
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Oleg F. Petrov
- Joint Institute of High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | - Evgeny I. Mayevsky
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Russia
| | - Vladimir E. Fortov
- Joint Institute of High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | | | - Boris S. Naroditsky
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
| | - Alexander L. Gintsburg
- Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences, Moscow, Russia
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