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Nonthermal plasma

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https://www.readbyqxmd.com/read/28768419/lipid-droplets-exhaustion-with-caspases-activation-in-hela-cells-cultured-in-plasma-activated-medium-observed-by-multiplex-coherent-anti-stokes-raman-scattering-microscopy
#1
Ryo Furuta, Naoyuki Kurake, Keigo Takeda, Kenji Ishikawa, Takayuki Ohta, Masafumi Ito, Hiroshi Hashizume, Hiromasa Tanaka, Hiroki Kondo, Makoto Sekine, Masaru Hori
The multiplex coherent anti-Stokes Raman scattering microscopy allowed label-free visualization of cytoplasmic lipid droplets (LDs). The LDs, which act to conserve energy storage, are usually accumulated during the normal apoptosis of HeLa cells with activation of caspase-3/7 leading to downregulation of the fatty acid catabolism pathways. During cultivating in nonthermal plasma-activated medium (PAM), while the activation of caspase-3/7 was induced, the authors found that a dynamic exhaustion of the intracellular LDs, underlying the metabolic mechanism of the PAM-induced apoptotic cell death of HeLa cells...
August 2, 2017: Biointerphases
https://www.readbyqxmd.com/read/28748438/combined-fast-selective-reduction-using-mn-based-catalysts-and-nonthermal-plasma-for-nox-removal
#2
Jun Xiang Chen, Kuan Lun Pan, Sheng Jen Yu, Shaw Yi Yen, Moo Been Chang
In this study, the concept of fast SCR for NO reduction with NH3 as reducing agent is realized via the combination of nonthermal plasma (NTP) with Mn-based catalyst. Experimental results indicate that 10% wt. Mn-Ce-Ni/TiO2 possesses better physical and chemical properties of surface, resulting in higher NO removal efficiency if compared with 10% wt. Mn-Ce/TiO2 and 10% wt. Mn-Ce-Cu/TiO2. Mn-Ce-Ni/TiO2 of 10% wt. achieves 100% NOx conversion at 150 °C, while 10% wt. Mn-Ce/TiO2 and 10% wt. Mn-Ce-Cu/TiO2 need to be operated at a temperature above 200 °C for 100% NOx conversion...
July 26, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28746053/bacterial-attachment-on-titanium-surfaces-is-dependent-on-topography-and-chemical-changes-induced-by-nonthermal-atmospheric-pressure-plasma
#3
Won-Seok Jeong, Jae-Sung Kwon, Jung-Hwan Lee, Soo-Hyuk Uhm, Eun Ha Choi, Kwang-Mahn Kim
Here, we investigated the antibacterial effects of chemical changes induced by nonthermal atmospheric pressure plasma (NTAPP) on smooth and rough Ti. The morphologies of smooth and rough surfaces of Ti were examined using scanning electron microscopy (SEM). Both Ti specimens were then treated for 10 min by NTAPP with nitrogen gas. The surface roughness, chemistry, and wettability were examined by optical profilometry, x-ray photoelectron spectroscopy, and water contact angle analysis, respectively. Bacterial attachment was measured by determining the number of colony forming units and by SEM analysis...
July 26, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28713119/adhesive-bonding-to-computer-aided-design-computer-aided-manufacturing-esthetic-dental-materials-an-overview
#4
Mohamed Moustafa Awad, H Alqahtani, A Al-Mudahi, M S Murayshed, A Alrahlah, Shilpa H Bhandi
AIM: To review the adhesive bonding to different computer-aided design/computer-aided manufacturing (CAD/CAM) esthetic restorative materials. BACKGROUND: The use of CAD/CAM esthetic restorative materials has gained popularity in recent years. Several CAD/ CAM esthetic restorative materials are commercially available. Adhesive bonding is a major determinant of success of CAD/ CAM restorations. Review result: An account of the currently available bonding strategies are discussed with their rationale in various CAD/ CAM materials...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28709357/coulomb-collision-model-for-use-in-nonthermal-plasma-simulation
#5
Andrew M Chap, Raymond J Sedwick
In kinetic simulations of non-Maxwellian plasmas, the calculation of particle scattering due to Coulomb collisions has no simple approximation. In such simulations, the number of collision interactions a particle experiences in a single time step is typically too large for direct calculation. In this work, the cumulative effect of a series of binary collisions is calculated numerically in a stochastic manner, and heuristic trends are produced as functions of the local plasma parameters. The result is a collision model suitable for implementation into a kinetic plasma simulation...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28709226/kinetic-modeling-of-x-ray-laser-driven-solid-al-plasmas-via-particle-in-cell-simulation
#6
R Royle, Y Sentoku, R C Mancini, I Paraschiv, T Johzaki
Solid-density plasmas driven by intense x-ray free-electron laser (XFEL) radiation are seeded by sources of nonthermal photoelectrons and Auger electrons that ionize and heat the target via collisions. Simulation codes that are commonly used to model such plasmas, such as collisional-radiative (CR) codes, typically assume a Maxwellian distribution and thus instantaneous thermalization of the source electrons. In this study, we present a detailed description and initial applications of a collisional particle-in-cell code, picls, that has been extended with a self-consistent radiation transport model and Monte Carlo models for photoionization and KLL Auger ionization, enabling the fully kinetic simulation of XFEL-driven plasmas...
June 2017: Physical Review. E
https://www.readbyqxmd.com/read/28689901/effect-of-nonthermal-plasma-on-the-properties-of-a-resinous-liner-submitted-to-aging
#7
Marcelo Coelho Goiato, Emily Vivianne Freitas da Silva, Rodrigo Antonio de Medeiros, Sandro Basso Bitencourt, Elidiane Cipriano Rangel, Nilson Cristino da Cruz, Daniela Micheline Dos Santos
STATEMENT OF PROBLEM: The properties, such as softness and viscoelasticity, of a resinous reliner can deteriorate and extrinsic elements can become incorporated, making surface protection of the reliner material essential. PURPOSE: The purpose of this in vitro study was to evaluate the effect of low temperature plasma on Coe-Soft resinous reliner, submitted to aging in artificial saliva for up to 180 days. Sorption, solubility, Shore A hardness, surface energy, and topographic characteristics were analyzed by scanning electronic microscopy (SEM) and energy-dispersive spectroscopy (EDS)...
July 7, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28640537/changes-in-the-biomechanical-properties-of-a-single-cell-induced-by-nonthermal-atmospheric-pressure-micro-dielectric-barrier-discharge-plasma
#8
Hyeongwon Choi, Eun Ha Choi, Kyung Sook Kim
Mechanical properties of a single cell are closely related to the fate and functions of the cell. Changes in mechanical properties may cause diseases or cell apoptosis. Selective cytotoxic effects of nonthermal atmospheric pressure micro-dielectric barrier discharge (DBD) plasma have been demonstrated on cancer cells. In this work, changes in the mechanical properties of a single cell induced by nonthermal atmospheric pressure micro-DBD plasma were investigated using atomic force microscopy (AFM). Two cervical cancer cell lines (HeLa and SiHa) and normal human fibroblast cells (HFBs) were exposed to micro-DBD plasma for various exposure times...
June 22, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28584774/nonthermal-plasma-in-dentistry-an-update
#9
REVIEW
Rajeev Ranjan, P V Krishnamraju, Thatapudi Shankar, Snigdha Gowd
The recent enormous progress in understanding of plasma physics and development of plasma jet has attracted focus on the application of plasma in medicine and dentistry. Active plasma ions, electrons, and photons have the ability to activate and control various biochemical procedures. Nonthermal plasma (NTP) is widely used for various therapeutic applications in health care. Particularly in dentistry, NTP holds big potential such as for bacterial inactivation, efficient sterilization, and treatment of dental caries...
May 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28548513/universal-self-similar-scaling-of-spatial-wilson-loops-out-of-equilibrium
#10
J Berges, M Mace, S Schlichting
We investigate strongly correlated non-Abelian plasmas out of equilibrium. Based on numerical simulations, we establish a self-similar scaling property for the time evolution of spatial Wilson loops that characterizes a universal state of matter far from equilibrium. Most remarkably, it exhibits a generalized area law which holds for a sufficiently large ratio of spatial area and fractional power of time. Performing calculations also for the perturbative regime at higher momenta, we are able to characterize the full nonthermal scaling properties of SU(2) and SU(3) symmetric plasmas from short to large distance scales in terms of two independent universal exponents and associated scaling functions...
May 12, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28362174/thermodynamics-transport-phenomena-and-electrochemistry-of-external-field-assisted-nonthermal-food-technologies
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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