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Nonthermal plasma

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https://www.readbyqxmd.com/read/28362174/thermodynamics-transport-phenomena-and-electrochemistry-of-external-field-assisted-non-thermal-food-technologies
#1
N N Misra, Alex Martynenko, Farid Chemat, Larysa Paniwnyk, Francisco J Barba, Anet Režek Jambrak
Interest in the development and adoption of nonthermal technologies is burgeoning within the food and bioprocess industry, the associated research community, and among the consumers. This is evident from not only the success of some innovative nonthermal technologies at industrial scale, but also from the increasing number of publications dealing with these topics, a growing demand for foods processed by nonthermal technologies and use of natural ingredients. A notable feature of the nonthermal technologies such as cold plasma, electrohydrodynamic processing, pulsed electric fields, and ultrasound is the involvement of external fields, either electric or sound...
March 31, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/28339534/inactivation-of-dermatophyte-infection-by-nonthermal-plasma-on-animal-model
#2
Vladimír Scholtz, Hana Soušková, Michaela Švarcová, Vítezslav Kríha, Helena Živná, Jaroslav Julák
Superficial fungal infections are a major epidemiological issue with increasing prevalence and are a common global problem. This article describes experimental therapy of superficial fungal skin infection using low-temperature plasma. Groups of guinea pigs were artificially infected with Trichophyton mentagrophytes SK 3286 dermatophyte and treated with plasma produced by a DC cometary discharge with an inserted grid. The course of infection was a week shorter and milder in animals treated by plasma than that in nontreated animals, the significant lowering of dermatophytic germs also occurred in the treated group...
June 1, 2017: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/28243603/miniature-dielectric-barrier-discharge-nonthermal-plasma-induces-apoptosis-in-lung-cancer-cells-and-inhibits-cell-migration
#3
Surya B Karki, Eda Yildirim-Ayan, Kathryn M Eisenmann, Halim Ayan
Traditional cancer treatments like radiotherapy and chemotherapy have drawbacks and are not selective for killing only cancer cells. Nonthermal atmospheric pressure plasmas with dielectric barrier discharge (DBD) can be applied to living cells and tissues and have emerged as novel tools for localized cancer therapy. The purpose of this study was to investigate the different effects caused by miniature DBD (mDBD) plasma to A549 lung cancer cells. In this study, A549 lung cancer cells cultured in 12 well plates were treated with mDBD plasma for specified treatment times to assess the changes in the size of the area of cell detachment, the viability of attached or detached cells, and cell migration...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28221980/inactivation-of-yeast-on-grapes-by-plasma-activated-water-and-its-effects-on-quality-attributes
#4
Jian Guo, Kang Huang, Xiao Wang, Chenang Lyu, Nannan Yang, Yanbin Li, Jianping Wang
Plasma-activated water (PAW) is a promising nonthermal technology in food preservation and food safety. The inactivation efficacy of PAW was investigated against Saccharomyces cerevisiae CICC 1374 inoculated on grape berries. PAW30 and PAW60 were obtained by activating water with plasma for 30 and 60 min, respectively. Grapes were directly treated with PAW, and a 0.38- to 0.53-log CFU/ml reduction of S. cerevisiae was achieved in a time-dependent manner (P < 0.05). The oxidation-reduction potential and pH values of PAW30 and PAW60 were also in a time-dependent manner (P < 0...
February 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28211730/kinetic-turbulence-in-relativistic-plasma-from-thermal-bath-to-nonthermal-continuum
#5
Vladimir Zhdankin, Gregory R Werner, Dmitri A Uzdensky, Mitchell C Begelman
We present results from particle-in-cell simulations of driven turbulence in magnetized, collisionless, and relativistic pair plasmas. We find that the fluctuations are consistent with the classical k_{⊥}^{-5/3} magnetic energy spectrum at fluid scales and a steeper k_{⊥}^{-4} spectrum at sub-Larmor scales, where k_{⊥} is the wave vector perpendicular to the mean field. We demonstrate the development of a nonthermal, power-law particle energy distribution f(E)∼E^{-α}, with an index α that decreases with increasing magnetization and increases with an increasing system size (relative to the characteristic Larmor radius)...
February 3, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28188648/pilot-study-to-evaluate-a-plasma-device-for-the-treatment-of-onychomycosis
#6
S R Lipner, G Friedman, R K Scher
Onychomycosis is a fungal infection of the nail unit, and is the most common of the nail disorders. Current therapies for onychomycosis have less than ideal efficacy and have the potential for adverse effects. As previous studies have shown that nonthermal plasma inhibits the in vitro growth of Trichophyton rubrum, we conducted a pilot study on 19 participants with toenail onychomycosis. The primary endpoint was safety of the device, and secondary outcome measures were clinical efficacy and mycological cure...
February 11, 2017: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/28169525/nonthermal-plasma-synthesis-of-core-shell-quantum-dots-strained-ge-si-nanocrystals
#7
Katharine I Hunter, Jacob T Held, K Andre Mkhoyan, Uwe R Kortshagen
In this work, we present an all-gas-phase approach for the synthesis of quantum-confined core/shell nanocrystals (NCs) as a promising alternative to traditional solution-based methods. Spherical quantum dots (QDs) are grown using a single-stage flow-through nonthermal plasma, yielding monodisperse NCs, with a concentric core/shell structure confirmed by electron microscopy. The in-flight negative charging of the NCs by plasma electrons keeps the NC cores separated during shell growth. The success of this gas-phase approach is demonstrated here through the study of Ge/Si core/shell QDs...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28166240/involvement-of-multiple-stressors-induced-by-non-thermal-plasma-charged-aerosols-during-inactivation-of-airborne-bacteria
#8
Nachiket D Vaze, Sin Park, Ari D Brooks, Alexander Fridman, Suresh G Joshi
A lab-scale, tunable, single-filament, point-to-point nonthermal dieletric-barrier discharge (DBD) plasma device was built to study the mechanisms of inactivation of aerosolized bacterial pathogens. The system inactivates airborne antibiotic-resistant pathogens efficiently. Nebulization mediated pre-optimized (4 log and 7 log) bacterial loads were challenged to plasma-charged aerosols, and lethal and sublethal doses determined using colony assay, and cell viability assay; and the loss of membrane potential and cellular respiration were determined using cell membrane potential assay and XTT assay...
2017: PloS One
https://www.readbyqxmd.com/read/28160353/a-review-on-microbiological-decontamination-of-fresh-produce-with-nonthermal-plasma
#9
REVIEW
C Pignata, D D'Angelo, E Fea, G Gilli
Food safety is a critical public health issue for consumers and the food industry because microbiological contamination of food causes considerable social and economic burdens on health care. Most foodborne illness comes from animal production, but as of the mid-1990s in the United States and more recently in the European Union, the contribution of fresh produce to foodborne outbreaks has rapidly increased. Recent studies have suggested that sterilization with nonthermal plasma could be a viable alternative to the traditional methods for the decontamination of heat-sensitive materials or food because this technique proves capable of eliminating micro-organisms on surfaces without altering the substrate...
February 4, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28088998/successful-treatment-of-actinic-keratoses-using-nonthermal-atmospheric-pressure-plasma-a-case-series
#10
Peter C Friedman, Vandana Miller, Gregory Fridman, Abraham Lin, Alexander Fridman
No abstract text is available yet for this article.
February 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28040155/nonthermal-inactivation-of-norovirus-surrogates-on-blueberries-using-atmospheric-cold-plasma
#11
Alison Lacombe, Brendan A Niemira, Joshua B Gurtler, Joseph Sites, Glenn Boyd, David H Kingsley, Xinhui Li, Haiqiang Chen
Viruses are currently the leading cause of foodborne outbreaks, most of which are associated with foods consumed raw. Cold plasma (CP) is an emerging novel nonthermal technology that can be used to surface decontaminate foods. This study investigated CP technology for the nonthermal inactivation of human norovirus surrogates, Tulane virus (TV) and murine norovirus (MNV), on the surface of blueberries. Blueberries (5 g) were weighed into sterile 4 oz. glass jars and inoculated with TV, 5 log PFU/g. Samples were treated with atmospheric CP for 0, 15, 30, 45, and 60 s at a working distance of 7...
May 2017: Food Microbiology
https://www.readbyqxmd.com/read/28024588/surface-analysis-and-shear-bond-strength-of-zirconia-on-resin-cements-after-non-thermal-plasma-treatment-and-or-primer-application-for-metallic-alloys
#12
Aljomar José Vechiato-Filho, Adaias Oliveira Matos, Richard Landers, Marcelo Coelho Goiato, Elidiane Cipriano Rangel, Grace Mendonça De Souza, Valentim Adelino Ricardo Barão, Daniela Micheline Dos Santos
There is no established protocol for bonding zirconia (Y-TZP) with resin cements. Non-thermal plasma (NTP) may be an alternative for the clinical problems related to adhesion. The purpose of the present study was to characterize the surface of Y-TZP exposed to methane (CH4) NTP or coated with a layer of primer for metal alloys and the association between the two methods and to evaluate the effect of NTP treatment on bond strength between Y-TZP and two resin cements. A total of 235 Y-TZP discs (8×2mm) were distributed into five groups: Co (no surface treatment), Pr (primer), NTP (methane plasma), Pr+NTP and NTP+Pr...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27982637/magnetorotational-turbulence-and-dynamo-in-a-collisionless-plasma
#13
Matthew W Kunz, James M Stone, Eliot Quataert
We present results from the first 3D kinetic numerical simulation of magnetorotational turbulence and dynamo, using the local shearing-box model of a collisionless accretion disk. The kinetic magnetorotational instability grows from a subthermal magnetic field having zero net flux over the computational domain to generate self-sustained turbulence and outward angular-momentum transport. Significant Maxwell and Reynolds stresses are accompanied by comparable viscous stresses produced by field-aligned ion pressure anisotropy, which is regulated primarily by the mirror and ion-cyclotron instabilities through particle trapping and pitch-angle scattering...
December 2, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27967059/influence-of-xe-and-kr-impurities-on-x-ray-yield-from-debris-free-plasma-x-ray-sources-with-an-ar-supersonic-gas-jet-irradiated-by-femtosecond-near-infrared-wavelength-laser-pulses
#14
V L Kantsyrev, K A Schultz, V V Shlyaptseva, G M Petrov, A S Safronova, E E Petkov, J J Moschella, I Shrestha, W Cline, P Wiewior, O Chalyy
Many aspects of physical phenomena occurring when an intense laser pulse with subpicosecond duration and an intensity of 10^{18}-10^{19}W/cm^{2} heats an underdense plasma in a supersonic clustered gas jet are studied to determine the relative contribution of thermal and nonthermal processes to soft- and hard-x-ray emission from debris-free plasmas. Experiments were performed at the University of Nevada, Reno (UNR) Leopard laser operated with a 15-J, 350-fs pulse and different pulse contrasts (10^{7} or 10^{5})...
November 2016: Physical Review. E
https://www.readbyqxmd.com/read/27966877/functionalization-of-the-polymeric-surface-with-bioceramic-nanoparticles-via-a-novel-nonthermal-dip-coating-method
#15
Andri K Riau, Debasish Mondal, Melina Setiawan, Alagappan Palaniappan, Gary H F Yam, Bo Liedberg, Subbu S Venkatraman, Jodhbir S Mehta
The only nonthermal method of depositing a bioceramic-based coating on polymeric substrates is by incubation in liquid, e.g., simulated body fluid to form an apatite-like layer. The drawbacks of this method include the long processing time, the production of low scratch resistant coating, and an end product that does not resemble the intended bioceramic composition. Techniques, such as plasma spraying and magnetron sputtering, involving high processing temperature are unsuitable for polymers, e.g., PMMA. Here, we introduce a nonthermal coating method to immobilize hydroxyapatite (HAp) and TiO2 nanoparticles on PMMA via a simple and fast dip coating method...
December 28, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27889137/microbial-decontamination-of-onion-powder-using-microwave-powered-cold-plasma-treatments
#16
Jung Eun Kim, Yeong Ji Oh, Mee Yeon Won, Kwang-Sik Lee, Sea C Min
The effects of microwave-integrated cold plasma (CP) treatments against spores of Bacillus cereus and Aspergillus brasiliensis and Escherichia coli O157:H7 on onion powder were investigated. The growth of B. cereus, A. brasiliensis, and E. coli O157:H7 in the treated onion powder was assessed during storage at 4 and 25 °C, along with the physicochemical and sensory properties of the powder. Onion powder inoculated with B. cereus was treated with CP using helium as a plasma-forming gas, with simultaneous exposure to low microwave density at 170 mW m(-2) or high microwave density at 250 mW m(-2)...
April 2017: Food Microbiology
https://www.readbyqxmd.com/read/27834351/corrigendum-time-dependent-effects-of-ultraviolet-and-nonthermal-atmospheric-pressure-plasma-on-the-biological-activity-of-titanium
#17
Sung-Hwan Choi, Won-Seok Jeong, Jung-Yul Cha, Jae-Hoon Lee, Hyung-Seog Yu, Eun-Ha Choi, Kwang-Mahn Kim, Chung-Ju Hwang
No abstract text is available yet for this article.
November 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27689286/carrier-multiplication-induced-structural-change-during-ultrafast-carrier-relaxation-and-nonthermal-phase-transition-in-semiconductors
#18
Junhyeok Bang, Y Y Sun, X-Q Liu, F Gao, S B Zhang
While being extensively studied as an important physical process to alter exciton population in nanostructures at the fs time scale, carrier multiplication has not been considered seriously as a major mechanism for phase transition. Real-time time-dependent density functional theory study of Ge_{2}Sb_{2}Te_{5} reveals that carrier multiplication can induce an ultrafast phase transition in the solid state despite that the lattice remains cold. The results also unify the experimental findings in other semiconductors for which the explanation remains to be the 30-year old phenomenological plasma annealing model...
September 16, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27627871/time-dependent-effects-of-ultraviolet-and-nonthermal-atmospheric-pressure-plasma-on-the-biological-activity-of-titanium
#19
Sung-Hwan Choi, Won-Seok Jeong, Jung-Yul Cha, Jae-Hoon Lee, Hyung-Seog Yu, Eun-Ha Choi, Kwang-Mahn Kim, Chung-Ju Hwang
Here, we evaluated time-dependent changes in the effects of ultraviolet (UV) and nonthermal atmospheric pressure plasma (NTAPPJ) on the biological activity of titanium compared with that of untreated titanium. Grade IV machined surface titanium discs (12-mm diameter) were used immediately and stored up to 28 days after 15-min UV or 10-min NTAPPJ treatment. Changes of surface characteristics over time were evaluated using scanning electron microscopy, surface profiling, contact angle analysis, X-ray photoelectron spectroscopy, and surface zeta-potential...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27604078/treatment-of-gastric-cancer-cells-with-nonthermal-atmospheric-plasma-generated-in-water
#20
Zhitong Chen, Li Lin, Xiaoqian Cheng, Eda Gjika, Michael Keidar
Nonthermal atmospheric plasma (NTAP) can be applied to living tissues and cells as a novel technology for cancer therapy. The authors report on a NTAP argon solution generated in deionized (DI) water for treating human gastric cancer cells (NCI-N87). Our findings show that the plasma generated in DI water with 30-min duration has the strongest effect on apoptosis in precultured human gastric cancer cells. This result can be attributed to the presence of reactive oxygen species (ROS) and reactive nitrogen species (RNS) produced in water during treatment...
2016: Biointerphases
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