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Nonthermal plasma

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https://www.readbyqxmd.com/read/29235455/atmospheric-pressure-mass-spectrometric-imaging-of-live-hippocampal-tissue-slices-with-subcellular-spatial-resolution
#1
Jae Young Kim, Eun Seok Seo, Hyunmin Kim, Ji-Won Park, Dong-Kwon Lim, Dae Won Moon
We report a high spatial resolution mass spectrometry (MS) system that allows us to image live hippocampal tissue slices under open-air atmospheric pressure (AP) and ambient temperature conditions at the subcellular level. The method is based on an efficient desorption process by femtosecond (fs) laser assisted with nanoparticles and a subsequent ionization step by applying nonthermal plasma, termed AP nanoparticle and plasma assisted laser desorption ionization (AP-nanoPALDI) MS method. Combining the AP-nanoPALDI with microscopic sample scanning, MS imaging with spatial resolution of 2...
December 13, 2017: Nature Communications
https://www.readbyqxmd.com/read/29211323/medical-applications-of-nonthermal-atmospheric-pressure-plasma-in-dermatology
#2
REVIEW
Lu Gan, Song Zhang, Devesh Poorun, Dawei Liu, Xinpei Lu, Mengwen He, Xiaoru Duan, Hongxiang Chen
Plasma is an ionized gas that consists of positively and negatively charged particles, neutral atoms, and photons. Recent developments in plasma sources have made it possible to generate room-temperature plasma in the "open air", thus enabling the application of plasma in vivo. Using nonthermal plasma, active agents can be efficiently delivered to target cells without creating thermal damage. Also known as cold atmospheric pressure plasma (CAP), nonthermal atmospheric pressure plasma offers innovative medical applications...
December 6, 2017: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/29204250/generation-and-role-of-reactive-oxygen-and-nitrogen-species-induced-by-plasma-lasers-chemical-agents-and-other-systems-in-dentistry
#3
REVIEW
Nayansi Jha, Jae Jun Ryu, Eun Ha Choi, Nagendra Kumar Kaushik
The generation of reactive oxygen and nitrogen species (RONS) has been found to occur during inflammatory procedures, during cell ischemia, and in various crucial developmental processes such as cell differentiation and along cell signaling pathways. The most common sources of intracellular RONS are the mitochondrial electron transport system, NADH oxidase, and cytochrome P450. In this review, we analyzed the extracellular and intracellular sources of reactive species, their cell signaling pathways, the mechanisms of action, and their positive and negative effects in the dental field...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29146825/toroidal-plasmoid-generation-via-extreme-hydrodynamic-shear
#4
Morteza Gharib, Sean Mendoza, Moshe Rosenfeld, Masoud Beizai, Francisco J Alves Pereira
Saint Elmo's fire and lightning are two known forms of naturally occurring atmospheric pressure plasmas. As a technology, nonthermal plasmas are induced from artificially created electromagnetic or electrostatic fields. Here we report the observation of arguably a unique case of a naturally formed such plasma, created in air at room temperature without external electromagnetic action, by impinging a high-speed microjet of deionized water on a dielectric solid surface. We demonstrate that tribo-electrification from extreme and focused hydrodynamic shear is the driving mechanism for the generation of energetic free electrons...
November 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29078897/investigation-of-blood-coagulation-effect-of-nonthermal-multigas-plasma-jet-in%C3%A2-vitro-and-in%C3%A2-vivo
#5
Yudai Nomura, Toshihiro Takamatsu, Hiroaki Kawano, Hidekazu Miyahara, Akitoshi Okino, Masaru Yoshida, Takeshi Azuma
BACKGROUND: Nonthermal atmospheric pressure plasma (NTAPP) has recently received attention as a novel tool in medicine. It is thought that plasma components yield plasma effects such as sterilization, blood coagulation, and wound healing. These effects are produced without thermal damage. We investigated the blood coagulation effect of NTAPP by using a multigas plasma jet. MATERIALS AND METHODS: Multigas plasma jets can generate NTAPP by several gas species. In this study, argon, oxygen, helium, nitrogen, mock air, and carbon dioxide were used to generate NTAPP, and blood coagulation times were compared with each plasma-treated sample...
November 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/29057263/sterilization-of-biofilm-on-a-titanium-surface-using-a-combination-of-nonthermal-plasma-and-chlorhexidine-digluconate
#6
Tripti Thapa Gupta, Surya B Karki, Jyl S Matson, Daniel J Gehling, Halim Ayan
Nosocomial infections caused by opportunistic bacteria pose major healthcare problem worldwide. Out of the many microorganisms responsible for such infections, Pseudomonas aeruginosa is a ubiquitous bacterium that accounts for 10-20% of hospital-acquired infections. These infections have mortality rates ranging from 18 to 60% and the cost of treatment ranges from $20,000 to $80,000 per infection. The formation of biofilms on medical devices and implants is responsible for the majority of those infections. Only limited progress has been made to prevent this issue in a safe and cost-effective manner...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28983512/gentle-reenergization-of-electrons-in-merging-galaxy-clusters
#7
Francesco de Gasperin, Huib T Intema, Timothy W Shimwell, Gianfranco Brunetti, Marcus Brüggen, Torsten A Enßlin, Reinout J van Weeren, Annalisa Bonafede, Huub J A Röttgering
Galaxy clusters are the most massive constituents of the large-scale structure of the universe. Although the hot thermal gas that pervades galaxy clusters is relatively well understood through observations with x-ray satellites, our understanding of the nonthermal part of the intracluster medium (ICM) remains incomplete. With Low-Frequency Array (LOFAR) and Giant Metrewave Radio Telescope (GMRT) observations, we have identified a phenomenon that can be unveiled only at extremely low radio frequencies and offers new insights into the nonthermal component...
October 2017: Science Advances
https://www.readbyqxmd.com/read/28958622/plasma-induced-dimerization-of-phloridzin-as-a-new-class-of-anti-adipogenic-agents
#8
Gyeong Han Jeong, Jae-Hyeon Cho, Seong-Ho Kim, Tae Hoon Kim
Phloridzin is a natural phloretin glucoside found in several parts of apple trees and is an attractive target for structural modification as novel pharmaceutical agent. Nonthermal dielectric barrier discharge (DBD) plasma-induced structural changes in dihydrochalcone phloridzin (1) resulted in the isolation of three new methylene-bridged dihydrochalcone dimers, methylenebisphloridzin (2), deglucosylmethylenebisphloridzin (3), and methylenebisphloretin (4), along with phloretin (5). The chemical structures of these newly generated compounds were elucidated by interpretation of their spectroscopic data...
September 18, 2017: Bioorganic & Medicinal Chemistry Letters
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
#9
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
#10
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...
September 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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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