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Nonthermal plasma

Aymen Amine Assadi, Sivachandiran Loganathan, Phuong Nguyen Tri, Sara Gharib-Abou Ghaida, Abdelkrim Bouzaza, Anh Nguyen Tuan, Dominique Wolbert
This paper mainly deals with the isovaleraldehyde degradation with the help of a nonthermal plasma surface discharge (NPSD) coupled with photocatalysis. The efficiency of NPSD reactor, for gas treatment, was studied for different binary mixtures: (1) mixture of aldehydes (Isovaleraldehyde and Butyraldehyde) and (2) mixture of aldehyde and amine (Isovaleraldehyde and Trimethylamine). A planar continuous reactor is used to investigate the effect of addition of another pollutant on the performance of oxidation process...
June 4, 2018: Journal of Hazardous Materials
Yaohua Huang, X Philip Ye, Christopher J Doona, Florence E Feeherry, Mark Radosevich, Siqun Wang
BACKGROUND: In order to utilize the potentials of nonthermal plasma technologies for food safety control and sanitation, the inactivation mechanisms of Bacillus amyloliquefaciens spores by nonthermal plasma of ambient air (NTP-AA) was investigated using Scanning Electron Microscopy, Atomic Force Microscopy, Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy with chemometric analysis, and Proton Nuclear Magnetic Resonance spectroscopy, to probe both the morphological and biochemical changes occurring in spores during the kinetic inactivation process...
June 10, 2018: Journal of the Science of Food and Agriculture
Karolina Anna Lis, Annika Boulaaba, Sylvia Binder, Yangfang Li, Corinna Kehrenberg, Julia Louise Zimmermann, Günter Klein, Birte Ahlfeld
The application of cold atmospheric pressure plasma (CAP) for decontamination of sliced ready-to-eat (RTE) meat products (in this case, rolled fillets of ham), inoculated with Salmonella (S.) Typhimurium and Listeria (L.) monocytogenes was investigated. Cold atmospheric plasma (CAP) is an ionised gas that includes highly reactive species and ozone, interacting with cell membranes and DNA of bacteria. The mode of action of CAPs includes penetration and disruption of the outer cell membrane or intracellular destruction of DNA located in the cytoplasm...
2018: PloS One
Kenneth R Beyerlein, H Olof Jönsson, Roberto Alonso-Mori, Andrew Aquila, Saša Bajt, Anton Barty, Richard Bean, Jason E Koglin, Marc Messerschmidt, Davide Ragazzon, Dimosthenis Sokaras, Garth J Williams, Stefan Hau-Riege, Sébastien Boutet, Henry N Chapman, Nicuşor Tîmneanu, Carl Caleman
The bright ultrafast pulses of X-ray Free-Electron Lasers allow investigation into the structure of matter under extreme conditions. We have used single pulses to ionize and probe water as it undergoes a phase transition from liquid to plasma. We report changes in the structure of liquid water on a femtosecond time scale when irradiated by single 6.86 keV X-ray pulses of more than 106 J/cm2 These observations are supported by simulations based on molecular dynamics and plasma dynamics of a water system that is rapidly ionized and driven out of equilibrium...
May 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
Dongmei Wang, Ze Wang, Lei Zhang, Zhiyuan Li, XiaoFei Tian, Jun Fang, Qingyou Lu, Xin Zhang
Mitochondrion is the major cellular energy producing organelle that is at the boundary between chemical reactions and physical processes. Although mitochondria have been shown to be affected by physical methods such as nonthermal plasma, whether static magnetic field (SMF) could also affect them is still unclear. Here we used rat adrenal PC12 cells to compare SMFs of different intensities for their effects on ATP (adenosine-5'-triphosphate), the major energy source produced by mitochondria, which is essential for various cellular processes...
April 30, 2018: Bioelectromagnetics
Juan M Pérez-Andrés, Clémentine M G Charoux, P J Cullen, Brijesh K Tiwari
A range of nonthermal techniques have demonstrated process efficacy in ensuring product safety, extension of shelf life, and in general a retention of key quality attributes. However, various physical, chemical and biochemical effects of nonthermal techniques on macro and micro nutrients are evident, leading to both desirable and undesirable changes in food products. The objective of this review is to outline the effects of nonthermal techniques on food chemistry and the associated degradation mechanisms with the treatment of foods...
May 23, 2018: Journal of Agricultural and Food Chemistry
Gerard M 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...
May 9, 2018: Nano Letters
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
U K Ercan, B Sen, A D Brooks, S 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 nitrotyrosine (a known marker of nitrosative stress), DNA damage, and generated a prominent pool of peroxynitrite...
April 6, 2018: Journal of Applied Microbiology
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
Siwapon Srisonphan
Advanced surface engineering aims to produce surfaces with well-controlled wettabilities; however, precise control over water imbibition (WI) 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 to elucidate how NAP fundamentally interacts with seed surfaces. We show that NAP can control WI and liquid spreading on seeds...
April 4, 2018: ACS Applied Materials & Interfaces
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
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
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
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...
2018: Autophagy
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
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
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
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
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
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