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Nonthermal plasma

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https://www.readbyqxmd.com/read/29659285/tuning-confinement-in-colloidal-silicon-nanocrystals-with-saturated-surface-ligands
#1
Gerard Michael Carroll, Rens Limpens, Nathan R Neale
The optical properties of silicon nanocrystals (Si NCs) are a subject of intense study and continued debate. In particular, Si NC photoluminescence (PL) properties are known to depend strongly on the surface chemistry, resulting in electron-hole recombination pathways derived from the Si NC band-edge, surface-state defects, or combined NC-conjugated ligand hybrid states. In this Letter, we perform a comparison of three different saturated surface functional groups-alkyls, amides, and alkoxides-on nonthermal plasma-synthesized Si NCs...
April 16, 2018: Nano Letters
https://www.readbyqxmd.com/read/29649112/effects-of-btex-on-the-removal-of-acetone-in-a-coaxial-non-thermal-plasma-reactor-role-analysis-of-the-methyl-group
#2
Liyuan Hou, Xiang Li, Deyuan Xie, Haining Wang
The removal of acetone and benzene series (BTEX) under individual and concurrent conditions is carried out in a coaxial nonthermal plasma (NTP) reactor. The results show that the benzene series has a significant negative impact on acetone conversion and CO₂ selectivity under NTP treatment. Furthermore, it is found that p -xylene significantly promotes COx selectivity under co-treatment with acetone because of greater CO generation. Based on the results of transient FTIR, MS, and GC-MS, it is seen that quantities of formic acid, formaldehyde, and ring-opening byproducts from benzene series decomposition are reduced, while quantities of aromatic byproducts with carboxyl, phenolic, and aldehyde groups on the benzene ring increase under coexistence conditions...
April 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29624820/escherichia-coli-cellular-responses-to-exposure-to-atmospheric-pressure-dielectric-barrier-discharge-dbd-plasma-treated-n-acetylcysteine-nac-solution
#3
Utku K Ercan, Bhaswati Sen, Ari D Brooks, Suresh G Joshi
AIM: To understand the underlying cellular mechanisms during inactivation of Escherichia coli in response to antimicrobial solution of nonthermal plasma-activated N-acetylcysteine (NAC). METHODS AND RESULTS: The recommended techniques were used to demonstrate E. coli cellular and transcriptomic changes caused associated with peroxynitrite and compared with plasma-treated NAC solution. The findings demonstrate that E. coli cells respond to plasma-treated NAC, and undergo severe oxidative and nitrosative stress, and leading to stress-induced damages to different components of bacterial cells, which includes loss of membrane potential, formation of oxidized glutathione (GSSG), formation of nitro-tyrosine (a known marker of nitrosative stress), DNA damage, and generated a prominent pool of peroxynitrite...
April 6, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29570061/high-voltage-multiphasic-nanosecond-pulses-to-modulate-cellular-responses
#4
Hollie A Ryan, Shinji Hirakawa, Enbo Yang, Chunrong Zhou, Shu Xiao
Nanosecond electric pulses are an effective power source in plasma medicine and biological stimulation, in which biophysical responses are governed by peak power and not energy. While uniphasic nanosecond pulse generators are widely available, the recent discovery that biological effects can be uniquely modulated by reversing the polarity of nanosecond duration pulses calls for the development of a multimodal pulse generator. This paper describes a method to generate nanosecond multiphasic pulses for biomedical use, and specifically demonstrates its ability to cancel or enhance cell swelling and blebbing...
April 2018: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/29547259/tuning-surface-wettability-through-hot-carrier-initiated-impact-ionization-in-cold-plasma
#5
Siwapon Srisonphan
Advanced surface engineering aims to produce surfaces with well-controlled wettabilities; however, precise control over water imbibition and liquid spreading on patterned surfaces remains a challenge. Nonthermal atmospheric plasma (NAP) treatment can dramatically change wettability; however, for coated biological objects, such as seeds, plasma interaction is not entirely understood. Herein, we employed atmospheric hybrid cold plasma (HCP) to elucidate how NAP fundamentally interacts with seed surfaces. We show that nonthermal atmospheric plasma can control water imbibition (WI) and liquid spreading on seeds...
March 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29441673/plasma-assisted-synthesis-and-surface-modification-of-electrode-materials-for-renewable-energy
#6
REVIEW
Shuo Dou, Li Tao, Ruilun Wang, Samir El Hankari, Ru Chen, Shuangyin Wang
Renewable energy technology has been considered as a "MUST" option to lower the use of fossil fuels for industry and daily life. Designing critical and sophisticated materials is of great importance in order to realize high-performance energy technology. Typically, efficient synthesis and soft surface modification of nanomaterials are important for energy technology. Therefore, there are increasing demands on the rational design of efficient electrocatalysts or electrode materials, which are the key for scalable and practical electrochemical energy devices...
February 14, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29396442/nonthermal-plasma-treated-solution-inhibits-adipocyte-differentiation-and-lipogenesis-in-3t3-l1-preadipocytes-via-er-stress-signal-suppression
#7
Sung Un Kang, Haeng Jun Kim, Dae Ho Kim, Chang Hak Han, Yun Sang Lee, Chul-Ho Kim
The accumulation and differentiation of adipocytes contribute to the development of obesity and metabolic diseases. It is well-known that interactions of transcription factors such as peroxisome proliferator-activated receptor gamma (PPARγ), CCAAT/enhancer binding protein α (C/EBPα), and endoplasmic reticulum (ER) stress are required for adipogenesis. Recently, use of nonthermal atmospheric plasma (NTP) is expanding from the biomedical field into various other fields. In this study, we investigated whether nonthermal plasma-treated solution (NTS) has an inhibitory effect on adipogenesis and elucidated its mechanisms...
February 2, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29374211/low-altitude-solar-magnetic-reconnection-type-iii-solar-radio-bursts-and-x-ray-emissions
#8
I H Cairns, V V Lobzin, A Donea, S J Tingay, P I McCauley, D Oberoi, R T Duffin, M J Reiner, N Hurley-Walker, N A Kudryavtseva, D B Melrose, J C Harding, G Bernardi, J D Bowman, R J Cappallo, B E Corey, A Deshpande, D Emrich, R Goeke, B J Hazelton, M Johnston-Hollitt, D L Kaplan, J C Kasper, E Kratzenberg, C J Lonsdale, M J Lynch, S R McWhirter, D A Mitchell, M F Morales, E Morgan, S M Ord, T Prabu, A Roshi, N Udaya Shankar, K S Srivani, R Subrahmanyan, R B Wayth, M Waterson, R L Webster, A R Whitney, A Williams, C L Williams
Type III solar radio bursts are the Sun's most intense and frequent nonthermal radio emissions. They involve two critical problems in astrophysics, plasma physics, and space physics: how collective processes produce nonthermal radiation and how magnetic reconnection occurs and changes magnetic energy into kinetic energy. Here magnetic reconnection events are identified definitively in Solar Dynamics Observatory UV-EUV data, with strong upward and downward pairs of jets, current sheets, and cusp-like geometries on top of time-varying magnetic loops, and strong outflows along pairs of open magnetic field lines...
January 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29260979/hspa5-negatively-regulates-lysosomal-activity-through-ubiquitination-of-mul1-in-head-and-neck-cancer
#9
Sun-Yong Kim, Hyo Jeong Kim, Haeng-Jun Kim, Dae Ho Kim, Jae Ho Han, Hyung Kwon Byeon, Keunho Lee, Chul-Ho Kim
HSPA5/GRP78/BiP plays an important role in cell survival or tumor progression. For these reasons, HSPA5 is an emerging therapeutic target in cancer development. Here we report that HSPA5 contributes to head and neck cancer (HNC) survival via maintenance of lysosomal activity; however, a nonthermal plasma (NTP, considered as a next-generation cancer therapy)-treated solution (NTS) inhibits HNC progression through HSPA5-dependent alteration of lysosomal activity. HSPA5 prevents NTS-induced lysosome inhibition through lysosomal-related proteins or regulation of gene expression...
February 21, 2018: Autophagy
https://www.readbyqxmd.com/read/29260804/surface-characterization-of-a-glass-fiber-post-after-nonthermal-plasma-treatment-with-hexamethyldisiloxane
#10
Victor Eduardo de Souza Batista, Aljomar José Vechiato-Filho, Paulo Francisco Cesar, Marcelo Coelho Goiato, Elidiane Cipriano Rangel, Eduardo Piza Pellizzer, Fellippo Ramos Verri, Valentim Adelino Ricardo Barão, Daniela Micheline Dos Santos
PURPOSE: To characterize the surface of glass fiber posts (GFP) after different surface treatments and evaluate which method incorporates higher amounts of silicon (Si) particles, as well as to evaluate the bond strength at the post/ composite-cement interface with four different surface treatments of glass fiber posts luted with composite cement. MATERIALS AND METHODS: Twelve glass fiber posts were obtained from the manufacturer. The posts were randomly distributed into four groups (n = 3): Co (control), no surface treatment; S, 70% alcohol and silane (60 s); HF + S, 10% hydrofluoric acid gel (60 s) and silane (60 s); NTP, nonthermal plasma of hexamethyldisiloxane (HMDSO) associated with argon (30 min)...
December 19, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29235455/atmospheric-pressure-mass-spectrometric-imaging-of-live-hippocampal-tissue-slices-with-subcellular-spatial-resolution
#11
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
#12
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...
January 2018: 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
#13
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
#14
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 28, 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-vitro-and-in-vivo
#15
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
#16
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
#17
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
#18
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...
November 1, 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
#19
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
#20
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
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