記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Plasma Processes and Polymers  

The current research focuses on carbon dioxide (CO2) conversion at ambient conditions using streamer plasma. In this study, treatment time and humidity have been found to influence CO2 conversion. Our findings reveal a maximum CO2 conversion rate of 35.2%, achieved with a remarkably high energy efficiency of CO2 conversion at 135% and a low energy cost of 2.17 eV/molecule. We employed optical emission and fourier-transform infrared spectroscopy spectroscopy to analyze the different dissociation products of CO2 and determine the percentage of CO2 conversion. Furthermore, we utilized a two-dimensional (2D) fluid dynamics model and a zero-dimensional (0D) chemistry model to gain insights into the reactor mechanism.

DOI： 10.1002/ppap.202300141

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掲載種別：研究論文（学術雑誌）   出版者・発行元：IEEE Sensors Letters  

Nonthermal atmospheric-pressure discharge plasma is considered important for sterilization. Reactive species, such as active oxygen species, radicals, and nitrate ions, generated by the discharge plasma damage the target bacterial cell wall/membrane and DNA. Several plasma sterilization methods have been proposed, including dielectric barrier discharge (DBD). To achieve effective sterilization, it is necessary to evaluate their characteristics using many parameters. This letter aims to demonstrate a proof-of-concept of a novel biological indicator for plasma sterilization. A biological indicator is used to verify sterilization outcomes. We employ DNA-labeled microbeads as biological indicators for the rapid visualization of plasma sterilization. This is based on our recently developed method for visual detection of DNA molecules. If plasma-derived factors cause the degradation of the DNA attached to the microbeads, this can be confirmed by visualization. Herein, we present the correlation between sterilization and visualization in the case of DBD. This method offers a rapid evaluation of plasma sterilization because it easily and quickly determines the sterilization capability of the plasma.

DOI： 10.1109/LSENS.2024.3420437

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出版者・発行元：Journal of Physics D: Applied Physics  

Electroporation, the transient permeabilization of cell membranes induced by electric fields, is an essential technique in biomedicine, facilitating gene delivery, drug transport, and cancer therapy. Despite its wide application, the influence of nitration, a biological modification involving the addition of nitro groups to phospholipids, on electroporation dynamics remains understudied. Here, we employ molecular dynamics simulations to investigate the impact of nitration on pore formation during electroporation. By systematically varying nitration levels and electric field strengths, we explore the nuanced interplay between nitration and electroporation kinetics. Our simulations reveal that increasing nitration levels significantly accelerate pore formation, with notable reductions in pore formation times observed at higher nitration percentages and stronger electric fields. This phenomenon underscores the modulatory role of nitration in altering the dynamics of electroporation. Additionally, our study sheds light on the intricate mechanisms underlying this process, providing essential insights for optimizing electroporation protocols in gene therapy, drug delivery, plasma cancer treatment and related biomedical applications. These findings illuminate the synergistic relationship between nitration and electroporation, paving the way for future advancements in this vital field.

DOI： 10.1088/1361-6463/ad3bc8

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出版者・発行元：Applied Physics Express  

This study reports the response of lettuce seeds undergoing dormancy breaking and early senescence to DBD plasma irradiation. A heat map of germination percentages at 12 h reveals that dormancy has broken at 39 days' storage, and that one minute of plasma irradiation enhances germination in dormant seeds. Plasma irradiation does not affect those seeds where dormancy has already broken. Early senescence via storage was estimated using ESR measurements and the molecular modification of quercetin. This study reveals that lettuce seed susceptibility to plasma irradiation depends on storage duration and conditions, with dormancy state as a critical variable modulating the impact of plasma irradiation.

DOI： 10.35848/1882-0786/ad3798

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Environmental Research  

DOI： https://doi.org/10.1016/j.envres.2024.118760

オープンデータURL： https://www.sciencedirect.com/science/article/pii/S0013935124006649#:~:text=Therefore,%20developing%20efficient,

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Scientific Reports  

Abstract

Several studies have documented that treatment by cold atmospheric pressure plasma (CAPP) on plants foster seed germination and growth in recent years. However, the molecular processes that underlie the action of CAPP on the seeds and plants remain mostly enigmatic. We here introduce gemmae of Marchantia polymorpha, a basal liverwort, as a novel model plant material suitable for CAPP research. Treating the gemmae with CAPP for a constant time interval at low power resulted in consistent growth enhancement, while growth inhibition at higher power in a dose-dependent manner. These results distinctly demonstrate that CAPP irradiation can positively and negatively regulate plant growth depending on the plasma intensity of irradiation, offering a suitable experimental system for understanding the molecular mechanisms underlying the action of CAPP in plants.

DOI： 10.1038/s41598-024-53104-1

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その他リンク： https://www.nature.com/articles/s41598-024-53104-1

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Plasma  

This study investigates the propagation dynamics of plasma streamers in a packed-bed dielectric barrier discharge using a 2D particle-in-cell/Monte Carlo collision model. To accurately simulate the high-intensity discharge and streamer propagation mechanism at atmospheric pressure, additional algorithms for particle merging and a new electron mechanism are incorporated into the traditional particle-in-cell/Monte Carlo collision model. To validate the accuracy of this improved model, qualitative comparisons are made with experimental measurements from the existing literature. The results show that the speed of streamer propagation and the distribution of plasma are strongly influenced by the dielectric constant of the packed pellet, which is commonly used as a catalyst. In cases with a moderate dielectric constant, the presence of a strong electric field between the pellet and dielectric layer on the electrode significantly enhances the discharge. This enables the streamer to propagate swiftly along the pellet surface and results in a wider spread of plasma. Conversely, a very high dielectric constant impedes streamer propagation and leads to localized discharge with high intensity. The improved model algorithms derived from this research offer valuable insights for simulating high-density plasma discharge and optimizing plasma processing applications.

DOI： 10.3390/plasma6040044

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Scientific Reports  

This study provides the health effects assessment of rice cultivated from plasma-irradiated seeds. The rice (Oryza sativa L.) cultivated from seeds with plasma irradiation showed a growth improvement (slope-ratios of with plasma to without plasma were 1.066, 1.042, and 1.255 for tiller, and earing, and ripening periods, respectively) and an 4% increase in yield. The cultivated rice was used for repeated oral administrations to mice for 4-week period. Distilled water and rice cultivated from seeds without plasma irradiation were also used as control. The weights of the lung, kidney, liver, and spleen, with corresponding average values of 0.22 g, 0.72 g, 2.1 g, and 0.17 g for w/ plasma group and 0.22 g, 0.68 g, 2.16 g, and 0.14 g for w/o plasma group, respectively, showing no effect due to the administration of rice cultivated from plasma-irradiated seeds. Nutritional status, liver function, kidney function, and lipid, neutral fat profiles, and glucose metabolism have no significant difference between with and without plasma groups. These results show no obvious subacute effects were observed on rice grains cultivated and harvested from the mother plant that experienced growth improvement by plasma irradiation. This study provides a new finding that there is no apparent adverse health effect on the grains harvested from the plasma-irradiated seeds.

DOI： 10.1038/s41598-023-43897-y

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japanese Journal of Applied Physics  

A gas-liquid discharge plasma (GLDP) reactor is used to degrade organic pollutants such as phenol. GLDP contains a 7-pin plate system used to enhance phenol degradation in the presence of various pH, and gas bubbles produced from air, O2, O3, CO2, and Ar gases. Experimental outcomes show the impact of solution pH, as phenol degradation efficiencies of 85%, 90%, 96%, and 98% were obtained for pH of 12, 9, 3, and 1, respectively, after 60 min of treatment. This shows that the optimum pH for phenol degradation lies between 1 and 3. Moreover, we explored the influence of gas bubbles generated using various gases, such as air, O2, O3, CO2, and Ar, on phenol degradation. In the presence of O3 gas bubbles, the rate and degree of phenol degradation were significantly increased compared to gas bubbles produced from other gases (O2, CO2, Ar, and air). The degradation competence of phenol by added oxygen remained higher than argon. The performance of the GLDP system at various pH values and gas bubbles was evaluated using kinetic models. Pseudo-zero, first and second reaction kinetics models were used to examine the degradation of phenol. The rate of degradation at different pH and in the presence of gas bubbles follows pseudo-zero-order kinetics. Our GLDP reactor consumed energy of 127.5 J l-1 for phenol degradation under the influence of air bubbles and pH 5. The outcome of this research can help in the design of new reactors for industrial wastewater treatment.

DOI： 10.35848/1347-4065/acebfb

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1002/ppap.202200137

その他リンク： https://onlinelibrary.wiley.com/doi/10.1002/ppap.202200137

担当区分：筆頭著者,　責任著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Frontiers in Physics  

Colossal research on CO2 and N2 conversion using non-thermal plasma (NTP) technology has been ongoing since many years. The primary focus is on CO and NH3 production through CO2 and N2 conversion, respectively, with high conversion efficiency and low energy consumption with or without catalysts. Although in the present study, we propose that the NTP can assist in converting CO2 and N2 to plant nutrients in the form of plasma-treated/activated water. We used a homemade streamer plasma device and produced plasma-activated water (PAW) using CO2 and N2 feed gas, CO2-activated water (CAW) and N2-activated water (NAW). Later, we used CAW and NAW to treat the radish seeds and evaluate the germination rate, germination percentage, and seeding growth. To understand the chemical changes in PAW after the NTP treatment, we performed a chemical analysis to detect NO2¯, NO3¯, NH4+, and H2O2 along with the PAW pH and temperature shift. Additionally, to understand the other species produced in the gas phase, we simulated chemical reactions using COMSOL Multiphysics® software. Our results show that NOx and NHx species are less produced in CAW than in NAW, but CO2-generated PAW offers a significantly more substantial effect on enhancing the germination rate and seeding growth than NAW. Therefore, we suggested that CO and H2O2 formed during CAW production trigger early germination and growth enhancement. Furthermore, the total plasma reactor energy consumption, NO3¯ and NH4+ selective production percentage, and N2 conversion percentage were calculated. To our best knowledge, this is the first study that uses plasma-assisted CO2 conversion as a nutrient for plant growth.

DOI： 10.3389/fphy.2023.1211166

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Biomolecules  

The potential of cold atmospheric plasma (CAP) in biomedical applications has received significant interest, due to its ability to generate reactive oxygen and nitrogen species (RONS). Upon exposure to living cells, CAP triggers alterations in various cellular components, such as the cell membrane. However, the permeation of RONS across nitrated and oxidized membranes remains understudied. To address this gap, we conducted molecular dynamics simulations, to investigate the permeation capabilities of RONS across modified cell membranes. This computational study investigated the translocation processes of less hydrophilic and hydrophilic RONS across the phospholipid bilayer (PLB), with various degrees of oxidation and nitration, and elucidated the impact of RONS on PLB permeability. The simulation results showed that less hydrophilic species, i.e., NO, NO2, N2O4, and O3, have a higher penetration ability through nitro-oxidized PLB compared to hydrophilic RONS, i.e., HNO3, s-cis-HONO, s-trans-HONO, H2O2, HO2, and OH. In particular, nitro-oxidation of PLB, induced by, e.g., cold atmospheric plasma, has minimal impact on the penetration of free energy barriers of less hydrophilic species, while it lowers these barriers for hydrophilic RONS, thereby enhancing their translocation across nitro-oxidized PLB. This research contributes to a better understanding of the translocation abilities of RONS in the field of plasma biomedical applications and highlights the need for further analysis of their role in intracellular signaling pathways.

DOI： 10.3390/biom13071043

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記述言語：その他   掲載種別：研究論文（学術雑誌）  

Cold atmospheric plasma (CAP) is a promising technology for several medical applications, including the removal of biofilms from surfaces. However, the molecular mechanisms of CAP treatment are still poorly understood. Here we unravel the possible mechanisms of CAP-induced oxidation of oligosaccharides, employing reactive molecular dynamics simulations based on the density functional-tight binding potential. Specifically, we find that the interaction of oxygen atoms (used as CAP-generated reactive species) with cellotriose (a model system for the oligosaccharides) can break structurally important glycosidic bonds, which subsequently leads to the disruption of the oligosaccharide molecule. The overall results help to shed light on our experimental evidence for cellotriose oxidation by CAP. This study provides atomic-level insight into the onset of plasma-induced removal of biofilms, as oligosaccharides are one of the main components of biofilm.

DOI： 10.1002/ppap.202200137

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Frontiers in Physics  

DOI： 10.3389/fphy.2022.1118018

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出版者・発行元：Plasma Medicine  

Seed treatment with non-thermal plasma has seen a tremendous increase in both direct and indirect applications recently. In this review, we examined the effects of direct plasma irradiation, plasma-activated water (PAW), plasma-activated Ringer’s lactate solution, and plasma-treated soil on seeds, resulting in positive, negative, and neutral changes. Furthermore, we will compare the impact of pressure and feed gases on seed germination and seedling growth. Addition-ally, we focused on the types of reactive oxygen and nitrogen species (RONS) and their concentrations produced in the gas and liquid phases, as these play a crucial role in germination percentage and seedling growth. In conclusion, we find that plasma agriculture’s success is contingent on seed morphology, the types and concentrations of reactive species, and specific plasma characteristics.

DOI： 10.1615/PlasmaMed.2023050454

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Science and Business Media LLC  

Abstract

Discharge plasma irradiates seeds with reactive oxygen and nitrogen species (RONS). However, RONS introduced in seeds by plasma irradiation have not been successfully detected thus far. This study provides experimental evidence that nitrate ion NO₃⁻ is introduced in lettuce seeds as RONS upon irradiation with atmospheric-pressure air dielectric barrier discharge plasma. Plasma irradiation for 5 min promotes seed germination. The components of the plasma-irradiated seeds were examined using electrospray ionization quantum mass spectrometry (ESI QMS), which revealed that the plasma irradiation introduced an ion with a mass of 62 m/z in detectable amounts. This ion was identified as NO₃⁻ by liquid chromatography (LC), multiple wavelength detector (MWD), and LC-ESI QMS. A one-dimensional simulation at electron temperature T_e = 1 eV, electron density N_e = 10¹³/m³, and gas temperature T_g = 300 K indicated the introduction of NO₃⁻, involving nitric oxide NO. NO₃⁻ is one of the most important ions that trigger signal transduction for germination when introduced in seeds. The scanning electron microscopy (SEM) images revealed that there was no change on the surface of the seeds after plasma irradiation. Plasma irradiation is an effective method of introducing NO₃⁻ in seeds in a dry process without causing damage.

DOI： 10.1038/s41598-022-16641-1

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その他リンク： https://www.nature.com/articles/s41598-022-16641-1

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Reviews of Modern Plasma Physics  

Recently, non-thermal plasma technology has been frequently used for wastewater treatment. Plasma technology uses the effect of high-energy electrons, reactive species, ultraviolet light, free radicals, and pyrolysis to treat wastewater. Although in many cases, only the use of non-thermal plasma alone is not successful in degrading the complex organic wastes. This might be because of complexity in wastewater or not appropriate plasma device for wastewater treatment, or improper use of plasma-generated species that plays a critical role in organic waste degradation. To increase the degradation efficiency and reduce treatment time, the combination of non-thermal plasma and catalysts (homogeneous and heterogeneous) improves pollutant removal. This review includes the different non-thermal plasma systems and their action on decolorizing or degradation of dyes, degradation of phenolic pollutants, and degradation of pharmaceutical products, including antibiotics and other volatile organic solvents (VOC’s) with and without catalyst. Finally, probable mechanisms and suggestions to improve the wastewater treatment using non-thermal plasma were put forward. This review aims to help researchers understand the role of treatment time, feed gases, and catalysts on the degradation of organic wastes and looks forward to all possible developments in this field.

DOI： 10.1007/s41614-022-00077-1

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その他リンク： https://link.springer.com/article/10.1007/s41614-022-00077-1/fulltext.html

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：International Journal of Molecular Sciences  

Due to their potential benefits, cold atmospheric plasmas (CAPs), as biotechnological tools, have been used for various purposes, especially in medical and agricultural applications. The main effect of CAP is associated with reactive oxygen and nitrogen species (RONS). In order to deliver these RONS to the target, direct or indirect treatment approaches have been employed. The indirect method is put into practice via plasma-activated water (PAW). Despite many studies being available in the field, the permeation mechanisms of RONS into water at the molecular level still remain elusive. Here, we performed molecular dynamics simulations to study the permeation of RONS from vacuum into the water interface and bulk. The calculated free energy profiles unravel the most favourable accumulation positions of RONS. Our results, therefore, provide fundamental insights into PAW and RONS chemistry to increase the efficiency of PAW in biological applications.

DOI： 10.3390/ijms23116330

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

その他リンク： https://www.mdpi.com/1422-0067/23/11/6330

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The advancement of the information age has intensified the focus on photosensitive materials for information storage devices. To develop new photosensitive two azobenzene side-chain polymers i.e., poly(E)-3-(4-((4-nitrophenyl)diazenyl)phenoxy)propyl acrylate (polymer-1) and poly(E)-3-(4-((2-methoxy-4-nitrophenyl)diazenyl)phenoxy)propyl acrylate (polymer-2), were developed, and their diffraction efficiency was evaluated. The impact of ionic liquids (ILs) on the diffraction efficiency was evaluated by combining the polymers with imidazolium and ammonium families of ILs such as 1-butyl-3-methylimidazolium bromide [Bmim]Br, 1-ethyl-3-methyl-imidazolium-bromide [Emim]Br (imidazolium ILs), and triethylammonium methanesulfonate [TMEAS] (ammonium IL). The molecular interaction of both azobenzene side-chain polymers with the ILs was evaluated before the diffraction efficiency studies by employing UV–vis, FT-IR, and confocal Raman spectroscopies. The spectroscopic studies revealed the interaction of the polymers with the imidazolium and ammonium ILs. The mean diffraction efficiency of polymers-1 and −2 were ∼0.05 and ∼0.022%, respectively. After the addition of the ILs, the diffraction efficiency increased. The highest diffraction efficiency was achieved with the polymer-2 + [Emim]Br system of 3.5% and polymer-2 + TEMS combination of 4.03%. Therefore, although the diffraction efficiency of polymer-1 was higher than that of polymer-2, after adding the ILs, the diffraction efficiency of polymer-2 surpassed that of the polymer-1 + ILs system.

DOI： 10.1016/j.jscs.2022.101485

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jscs.2022.101485

その他リンク： https://www.sciencedirect.com/science/article/pii/S1319610322000679?via%3Dihub

記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：MRS Advances  

Abstract: Dye-sensitized solar cell (DSSC) has low power output and efficiency. Even though the low-concentrated light can increase the POUT and power conversion efficiency (PCE) of DSSC, the effect of increase in the cell temperature, particularly electrolyte evaporation, becomes a major concern. In this study, we compared and investigated the performance of acetonitrile (AN-50), propionitrile (PN-50), and 3-metoxy propionitrile (Z-100) as nitrile-based electrolyte under low-concentrated light. The results showed 4–8 times increase in JSC and POUT in all electrolytes. AN-50 demonstrated an improved performance under influence of 2 cm distance concave mirror concentrated light with the highest JSC = 74.21 mA/cm2, POUT = 24.53 mW/cm2, and η = 7.99%. However, the performance of cell with AN-50 and PN-50 started to degrade within 3 h of measurement. In contrast, Z-100 displayed performance stability during 4 days measurement even with the lowest JSC= 49.98 mA/cm2, POUT = 19.50 mW/cm2, and η = 6.35%. Graphical abstract: [Figure not available: see fulltext.]

DOI： 10.1557/s43580-022-00270-x

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Processes  

DOI： 10.3390/pr10040654

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Agronomy  

To meet the needs of the hungry population, it is critical to boost agricultural product production while minimizing contaminated waste. The use of two nonthermal technologies, pulsed electric field (PEF) and nonthermal plasma (NTP), is increasing every day. As both PEF and NTP are relatively newer areas, there is limited knowledge about these two technologies and their modes of action. Studies showed that PEF treatment on the plant seeds helps germination and seedling growth. The positive impact of PEF intensity is highly dependent on the seed coat type and plant species. Another nonthermal technology, NTP, affects seed germination, seedling growth, yield, and resilience to abiotic stress when generated at varying pressures with and without different feed gases. Early germination, germination rate, and germination percentage were all improved when the seedlings were treated with NTP. Similarly to the PEF treatment, NTP had a negative or no effect on germination. This review examined the effects of PEF and NTP on seed germination and ana-lyzed the situation and mechanism behind the positive or negative effect. Deactivation of proteins and enzymes to extend the shelf life of beverages is another prominent application of PEF and NTP. The interaction of PEF and NTP with proteins aids in understanding the microscopic mechanism of these technologies. Therefore, we covered in this review the potential structural and functional changes in proteins/enzymes as a result of PEF and NTP, as well as a comparison of the benefits and drawbacks of these two technologies.

DOI： 10.3390/agronomy12020482

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出版者・発行元：Trans Tech Publications, Ltd.  

<jats:p>The development of platinum-free counter electrodes (CEs) is significant in the development of cost-effective dye-sensitized solar cells (DSSCs). In this study, Pt-free, low-cost carbon black-titanium nitrate (CB-TiN) nanocomposite counter electrodes CEs were prepared via simple heating and cooling process for application in DSSCs. Different weight concentrations of CB-TiN (15-200 mg) were uniformly blended with PEDOT:PSS at 350 rpm and 150°C for 10 mins. Thereafter, the solution mixtures were immediately cooled at 4°C overnight to produce PEDOT:PSS/CB-TiN CEs. Further, to investigate the effects of iso-octyphenoxy-polyethoxyethanol (TX100) on the performance of the PEDOT:PSS/CB-TIN CE, various concentrations of TX100 (1-10%) were blended with PEDOT:PSS/15mgCB-TiN CE mixture at room temperature to produce PEDOT:PSS/15mgCB-TiN/TX100 CEs. The results indicated a gradual increase in electrocatalytic activity coupled with a reduction in internal resistance in the DSSCs as the weight of CB-TiN nanoparticles was enhanced. Similar results were obtained when the concentration of TX100 was increased. The DSSCs with the PEDOT:PSS/200mgCB-TiN and PEDOT:PSS/15mgCB-TiN/10%TX100 CEs exhibited optimum performances of 4.42% and 4.32%, respectively. Their performance closely matches that of the Pt CE (4.43%).</jats:p>

DOI： 10.4028/www.scientific.net/amr.1168.35

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記述言語：その他   掲載種別：研究論文（学術雑誌）   出版者・発行元：Optical Materials  

Upconversion materials (UC) can convert low-energy photons into visible light and, therefore, can be incorporated in solar cells to increase the absorption of visible light. This study synthesized UC nanophosphors Yb3+, Er3+: Y2O3 and Yb3+, Er3+, Zn2+: Y2O3 by a simple co-precipitation method for application in dye-sensitized solar cells (DSSCs). The impact of the enhancement in the concentration of Zn2+ on the photoluminescence (PL) and color point of the synthesized nanophosphors was also investigated. The synthesized nanophosphors emitted intense red and weaker green emissions upon excitation at 980 nm. The incorporation of Zn2+ to the Yb3+, Er3+: Y2O3 nanophosphors leads to color tunability in the red and yellow regions. Furthermore, the synthesized nanophosphors were incorporated into the DSSC photoanode to form a TiO2-UC-based DSSC for converting near-infrared (NIR) into visible light. We observed that the TiO2-UC-based DSSC showed an enhancement ratio in current density and power conversion efficiency of 17.4% and 16.6%, respectively, compared to the bare TiO2-based DSSC. These results reveal that UC-based Yb3+, Er3+, Zn2+: Y2O3 nanophosphors are useful in improving the efficiency of DSSCs and in color tunability applications.

DOI： 10.1016/j.optmat.2021.111928

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記述言語：その他   出版者・発行元：Japanese Journal of Applied Physics  

Nitrogen is a very common element, comprising approximately 78% of Earth's atmosphere, and is an important component of various electronic devices while also being essential for life. However, it is challenging to directly utilize dinitrogen because of the highly stable triple bond in this molecule. The present review examines the use of non-equilibrium plasmas to generate controlled electron impacts as a means of generating reactive nitrogen species (RNS) with high internal energy values and extremely short lifetimes. These species include ground state nitrogen atoms, excited nitrogen atoms, etc. RNS can subsequently react with oxygen and/or hydrogen to generate new highly reactive compounds and can also be used to control various cell functions and create new functional materials. Herein, plasma-processing methods intended to provide RNS serving as short-lived precursors for a range of applications are examined in detail.

DOI： 10.35848/1347-4065/ac25dc

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記述言語：その他   掲載種別：研究論文（学術雑誌）  

The use of low-temperature plasma for the pre-sowing seed treatment is still in the early stage of research; thus, numerous factors affecting germination percentage, seedling growth, and yield remains unknown. This study aimed to estimate how two critical factors, such as harvest year and seed coat color, affect the percentage of germination and seedling growth after plasma treatment. Radish seeds stored for 2 and 1 year after harvesting (harvested in 2017 and 2018) were sorted into two colors (brown and grey) to investigate the plasma effect on harvest year and seed coat color. We analyzed the amounts of seed phytohormones and antioxidant (γ-tocopherol) were analyzed using mass spectrometry, and physical changes were studied using SEM, EDX, and EPR to understand the mechanism of plasma-induced changes in radish seeds. The obtained results revealed that plasma treatment on seeds affects the germination kinetics, and the maximal germination percentage depends on seed color and the time of seed storage after harvest. Through this study, for the first time, we demonstrated that physical and chemical changes in radish seeds after plasma treatment depends upon the seed color and harvest year. Positive effects of plasma treatment on growth are stronger for sprouts from seeds harvested in 2017 than in 2018. The plasma treatment effect on the sprouts germinated from grey seeds effect was stronger than sprouts from brown radish seeds. The amounts of gibberellin A3 and abscisic acid in control seeds strongly depended on the seed color, and plasma induced changes were better in grey seeds harvested in 2017. Therefore, this study reveals that Air scalar-DBD plasma's reactive oxygen and nitrogen species (RONS) can efficiently accelerate germination and growth in older seeds.

DOI： 10.1038/s41598-021-81175-x

記述言語：その他  

Dye-sensitized solar cells (DSSCs) are attractive due to their simple fabrication process, low cost, performance stability, and eco-friendly characteristics. The power output (Pout) can be improved by applying an external concentrator, but this is rarely applied because of increasing temperature. Here, we successfully increased the Pout of bifacial DSSCs with the V-shaped plane, and concave mirrors showed an improved power output (Pout: 6.42 and 24.31 mW/cm2, separately) compared to ones without mirrors (4.25 mW/cm2). The high surface temperature on the concave mirror can be reduced with 1 cm mirror distancing followed by a reduction in Pout (19.07 mW/cm2).

DOI： 10.1021/acsaem.1c02774

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The study of protein–protein interactions is of great interest. Several early studies focused on the murine double minute 2 (Mdm2)–tumor suppressor protein p53 interactions. However, the effect of plasma treatment on Mdm2 and p53 is still absent from the literature. This study investigated the structural changes in Mdm2, p53, and the Mdm2–p53 complex before and after possible plasma oxidation through molecular dynamic (MD) simulations. MD calculation revealed that the oxidized Mdm2 bounded or unbounded showed high flexibility that might increase the availability of tumor suppressor protein p53 in plasma-treated cells. This study provides insight into Mdm2 and p53 for a better understanding of plasma oncology.

DOI： 10.3390/ijms22179585

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Bacterial and mammalian proteins, such as lysozyme, are gaining increasing interest as anticancer drugs. This study aims to modify the lysozyme structure using cold atmospheric plasma to boost its cancer cell killing effect. We investigated the structure at acidic and neutral pH using various experimental techniques (circular dichroism, fluorescence, and mass spectrometry) and molecular dynamics simulations. The controlled structural modification of lysozyme at neutral pH enhances its activity, while the activity was lost at acidic pH at the same treatment conditions. Indeed, a larger number of amino acids were oxidized at acidic pH after plasma treatment, which results in a greater distortion of the lysozyme structure, whereas only limited structural changes were observed in lysozyme after plasma treatment at neutral pH. We found that the plasma-treated lysozyme significantly induced apoptosis to the cancer cells. Our results reveal that plasma-treated lysozyme could have potential as a new cancer cell killing drug.

DOI： 10.1016/j.ijbiomac.2021.05.146

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Over the past few years, polymers shown comprehensive utilization in optical devices, solar cells, sensors, and other such devices. However, the efficiency of these devices remains a problem. We have synthesized new thiophene based, lowband gap polymer, poly(2-heptadecyl-4-vinylthieno[3,4-d] [1,3] selenazole) (PHVTS) and investigated the interactions between the PHVTS and ionic liquids (ILs), in this study. We have used imidazolium- and ammonium-family ILs, and studied the interactions using various spectroscopic techniques such UV–visible, FTIR, and confocal Raman spectroscopies. Additionally, we studied surface morphology of the polymer-IL film. Spectroscopic studies show that both families of ILs can interact with the newly synthesized polymer poly(2-heptadecyl-4-vinylthieno[3,4-d] [1,3] selenazole). However, the imidazolium-family Ionic Liquid-polymer (IL-polymer) mixture films show higher conductivities than ammonium-family IL–polymer mixture films.

DOI： 10.1016/j.jscs.2021.101227

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Non-small cell lung cancer (NSCLC) is the most common type of lung cancer, with 85% of all lung cancer reported as NSCLC. Moreover, there are no effective treatments in advanced NSCLC. This study shows for the first time that oral administration of plasma-treated water (PTW) can cure advanced NSCLC. The cold plasma in water generates a cocktail of reactive species, and oral administration of this cocktail to mice showed no toxicities even at the highest dose of PTW, after a single dose and repeated doses for 28 d in mice. In vivo studies reveal that PTW showed favorable anticancer effects on chemo-resistant lung cancer, similarly to gefitinib treatment as a reference drug in a chemo-resistant NSCLC model. The anticancer activities of PTW seem to be involved in inhibiting proliferation and angiogenesis and enhancing apoptosis in the cancer cells. Interestingly, the PTW contributes to enhanced immune response and improved cachexia in the model.

DOI： 10.1088/1361-6463/abdff2

記述言語：その他  

In recent years, cold atmospheric pressure plasma (CAP) applications in agriculture are rapidly increasing. This review covers the effect of CAP and plasma-treated liquid (PTL) on seeds. CAP treatment on seed alters the germination percentage, morphology (shoot height, root length, surface area, etc.), gene expression, and biochemical responses (changes in hormones, antioxidants, amino acids, total soluble sugar content, chlorophyll content, etc.). The changes were incorporated in yield-related parameters (fresh and dry weight of seedlings) and water absorption capacity after plasma treatment. Lastly, we discussed the current status of CAP and PTL use in agricultural land.

DOI： 10.35848/1347-4065/abe47d

記述言語：その他   掲載種別：研究論文（学術雑誌）  

Triton X-100, DMSO and TiO2 were blended with PEDOT:PSS to produce a PEDOT:PSS/DMSO/TX100/TiO2 CE. A bifacial DSSC based on the PEDOT:PSS/DMSO/TX100/TiO2 CE was fabricated, and its photovoltaic characteristics were obtained under simulated solar light of 100 mWcm−2. Under bifacial illumination, the DSSC with the Pt CE achieved a current density (Jsc) of 16.16 mAcm−2 and system efficiency (Esys) of 8.67% while the DSSC with the PEDOT:PSS/DMSO/TX100/TiO2 CE achieved a Jsc of 17.72 mAcm−2 and a Esys of 9.14%. PEDOT:PSS/DMSO/TX100/TiO2 CE is very stable, has a high transmittance, exhibits high electro-catalytic activity, and is an excellent substitute for the Pt CE.

DOI： 10.1016/j.cplett.2021.138369

記述言語：その他  

DOI： 10.1021/acsagscitech.0c00070

記述言語：その他   掲載種別：研究論文（学術雑誌）  

The recent outbreak of a novel coronavirus (SARS-CoV-2) has caused substantial public health issues worldwide. Cold atmospheric plasma (CAP) has shown its potential application in sterilization. It would be interesting to check the possible effect of CAP on the structure of the C-terminal domain of SARS-CoV-2 (SARS-CoV-2-CTD) spike protein and the interaction SARS-CoV-2-CTD with human angiotensin-converting enzyme 2 (hACE2). Therefore, we performed molecular dynamics simulations to calculate the root-mean-square deviation, root-mean-square fluctuation, principal component analysis and solvent-accessible surface area of SARS-CoV-2-CTD and the SARS-CoV-2-CTD/hACE2 complex with and without possible oxidation.

DOI： 10.35848/1882-0786/abd717

記述言語：その他   掲載種別：研究論文（学術雑誌）  

As the application of nanotechnology increases continuously, the need for controlled size nanoparticles also increases. Therefore, in this work, we discussed the growth mechanism of carbon nanoparticles generated in Ar+CH4 multi-hollow discharge plasmas. Using the plasmas, we succeeded in continuous generation of hydrogenated amorphous carbon nanoparticles with controlled size (25–220 nm) by the gas flow. Among the nanoparticle growth processes in plasmas, we confirmed the deposition of carbon-related radicals was the dominant process for the method. The size of nanoparticles was proportional to the gas residence time in holes of the discharge electrode. The radical deposition developed the nucleated nanoparticles during their transport in discharges, and the time of flight in discharges controlled the size of nanoparticles.

DOI： 10.3390/pr9010002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

NADPH oxidases 1 (NOX1) derived reactive oxygen species (ROS) play an important role in the progression of cancer through signaling pathways. Therefore, in this paper, we demonstrate the effect of cold atmospheric plasma (CAP) on the structural changes of Noxa1 SH3 protein, one of the regulatory subunits of NOX1. For this purpose, firstly we purified the Noxa1 SH3 protein and analyzed the structure using X-ray crystallography, and subsequently, we treated the protein with two types of CAP reactors such as pulsed dielectric barrier discharge (DBD) and Soft Jet for different time intervals. The structural deformation of Noxa1 SH3 protein was analyzed by various experimental methods (circular dichroism, fluorescence, and NMR spectroscopy) and by MD simulations. Additionally, we demonstrate the effect of CAP (DBD and Soft Jet) on the viability and expression of NOX1 in A375 cancer cells. Our results are useful to understand the structural modification/oxidation occur in protein due to reactive oxygen and nitrogen (RONS) species generated by CAP.

DOI： 10.1016/j.ijbiomac.2020.09.120

記述言語：英語   掲載種別：研究論文（学術雑誌）  

In recent years, non-thermal plasma (NTP) application in agriculture is rapidly increasing. Many published articles and reviews in the literature are focus on the post-harvest use of plasma in agriculture. However, the pre-harvest application of plasma still in its early stage. Therefore, in this review, we covered the effect of NTP and plasma-treated water (PTW) on seed germination and growth enhancement. Further, we will discuss the change in biochemical analysis, e.g., the variation in phytohormones, phytochemicals, and antioxidant levels of seeds after treatment with NTP and PTW. Lastly, we will address the possibility of using plasma in the actual agriculture field and prospects of this technology.

DOI： 10.3390/PR8081002

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Ionic liquids (ILs) are known to provide stability to biomolecules. ILs are also widely used in the fields of chemical engineering, biological engineering, chemistry, and biochemistry because they facilitate enzyme catalyzed reactions and enhance their conversion rate. In this work, we have evaluated the influence of alkyl chain substitution of ammonium ILs such as diethylammonium dihydrogen phosphate (DEAP) and triethylammonium hydrogen phosphate (TEAP) for the stability and activity of the tobacco etch virus (TEV) protease. Further, we performed molecular dynamics (MD) simulations to calculate the RMSD (root mean square deviation) for TEV and TEV + ILs. Experimental and simulations results show that TEV is more stable in the presence of TEAP than DEAP. Whereas, TEV protease activity for the cleavage of fusion proteins is preserved in the presence of DEAP while lost in the presence of TEAP. Hence, DEAP IL can serve as alternative solvents for the stability of the TEV protease with preserved activity. To the best of our knowledge, this is first study to show that ILs can stabilize and maintain the TEV protease cleavage activity.

DOI： 10.1016/j.ijbiomac.2020.03.175

記述言語：その他  

DOI： 10.1515/9783110650600-003

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Recently, cold atmospheric plasma (CAP) treatment on seed germination has emerged as a useful technique to increase agriculture production, although, the mechanism of the cold plasma in seed germination is still under investigation. In this work, we studied the role of pigments in the seed coat of radish sprouts on the electron spin resonance (ESR) signals before and after CAP treatment. Radish sprouts seeds having gray color show enhanced ESR signals after the CAP treatment, whereas, no increased ESR signals were observed for brown color seeds of radish sprouts as compared to their respective control seeds. These results reveal that seeds from the same harvest year having different seed coat colors show different responses to the plasma treatment. Although ESR signal intensity can vary with the harvest year, the change in ESR signal intensity after plasma treatment depends on the seed coat color. Independently on the harvest year (2017 and 2018), CAP increased ESR signals stronger in the grey seeds in comparison to the brown ones. The results indicated that seed coat color may be an important variable for understanding differences in the extent of CAP effects on seeds.

DOI： 10.35848/1347-4065/ab7698

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Understanding the folding and stability of membrane proteins is of great importance in protein science. Recently, osmolytes and ionic liquids (ILs) are increasingly being used as drug delivery systems in the biopharmaceutical industry. However, the stability of membrane proteins in the presence of osmolytes and ILs is not yet fully understood. Besides, the effect of oxidative stress on membrane proteins with osmolytes or ILs has not been investigated. Therefore, we studied the influence of osmolytes and ILs as co-solvents on the stability of a model membrane protein (i.e., Bacteriorhodopsin in purple membrane of Halobacterium salinarum), using UV–Vis spectroscopy and molecular dynamics (MD) simulations. The MD simulations allowed us to determine the flexibility and solvent accessible surface area (SASA) of Bacteriorhodopsin protein in the presence and/or absence of co-solvents, as well as to carry out principal component analysis (PCA) to identify the most important movements in this protein. In addition, by means of UV–Vis spectroscopy we studied the effect of oxidative stress generated by cold atmospheric plasma on the stability of Bacteriorhodopsin in the presence and/or absence of co-solvents. This study is important for a better understanding of the stability of proteins in the presence of oxidative stress.

DOI： 10.1016/j.ijbiomac.2020.01.179

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Nanomaterials such as carbon nanotubes (CNTs) have been used as an excellent material for catalysis, separation, adsorption and disinfection processes. CNTs have grabbed the attention of the scientific community and they have the potential to adsorb most of the organic compounds from water. Unlike, reverse osmosis (RO), nanofiltration (NF) and ultrafiltration (UF) membranes aligned CNT membranes can act as high-flow desalination membranes. CNTs provide a relatively safer electrode solution for biosensors. The article is of the utmost importance for the scientists and technologists working in water purification technologies to eliminate the water crisis in the future. This review summarizes about the application of CNTs in water purification.

DOI： 10.3390/jcs4030135

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2174/187152061904190521102345

その他リンク： http://www.eurekaselect.com/node/172215/viewhtml/U2s5fVmViVazoVBQqlRGbd01j2UXhRrVok9jtTDBfGdk0RRVjTIxmRExqqekyU1O9Ex6eUW5r2YUChwUBnRifYkMs5Qn7VRMfEZvlTlFw5ZzvB4To2lT6MDBjjTF3RRaqnpOsaXcb1b2lRjRFzFzlbmZtIeGngwWjlh0yaDB3MejEJoMqGRicV3hbCOGiZEQgkE0tTnl1UUXxl

記述言語：英語   掲載種別：研究論文（学術雑誌）  

その他リンク： https://aip.scitation.org/doi/10.1063/1.5086522

記述言語：英語   掲載種別：研究論文（学術雑誌）  

その他リンク： http://www.eurekaselect.com/node/167260/article/cold-atmospheric-plasma-activated-solution-a-new-approach-for-cancer-treatment

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-018-29549-6

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-018-28600-w

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1088/1361-6463/aac571

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1155/2018/8275985

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2174/1871520618666180406121734

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2298/JSC170527107K

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c7ra13389h

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-018-21001-z

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2174/187152061806181112124717

記述言語：英語  

The progress of nanotechnology has opened the path for the development of new biomaterials. Recent developments have demonstrated that sol-gel bioceramics play an important role in the biomedical field due to their superior biological and mechanical properties. A bioactive hydroxyapatite (HA) is a common bioceramic that attaches to living tissues in vivo at body temperature. Sol-gel processes are now being used to produce bioactive coatings, powders, and substrates that can facilitate control over biological behavior of proteins and cells with broad clinical applications. It has been found that HA particles can down-regulate the expression of some cancerogenic genes in 432tumor cells. The nano-HA particles from the biodegradation of HA ceramics could penetrate the membranes of tumor cells. A rapid and economic sol-gel method has been designed to synthesize sodium silicate (Na ₂ SiO ₃ ) into silica gel in large quantities. Sol-gel-based bioceramics have the potential to present unexpected excellent biological functions. Thus, the understanding and control of the interactions between bioceramics and biological entities may play one of the leading roles in the development of nanomedicine.

DOI： 10.1201/9781315163598

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c7cp04083k

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-017-08643-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1039/c7nj00151g

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1038/s41598-017-02690-4

記述言語：英語  

担当ページ：137-150   記述言語：英語  

One of the major sources, which wastes the environment is the wastewater produced from the human activity due to enhanced discharge of toxic and persistent organic pollutants into the fresh water sources like rivers etc. Ground and surface waters contain, generally, impurities including organic pollutants such as pesticides, polychlorinated biphenyls (PCBs), halogenated organic solvents and polycyclic aromatic hydrocarbons (PAHs), discharged from industrial and wastewater treatment plants affect their appearance and may have adverse effects for consumers. Presence of large colloidal particle leads to clogging of filtering devices which increases cost of water purification. Bentonite is a kind of low-cost and easily obtained clay mineral. Dominant clay minerals in bentonites are smectites such as montmorillonite, beidellite, saponite, nontronite and hectronite. Natural Bentonite is effective adsorbent for cations but it shows lower affinity towards negative groups, like phosphate, due to the absence of reactive adsorption sites for anions in water. Bentonite clay can treat oil, sulfate, phosphate and is extremely effective at removing certain cationic components from wastewater and has a remarkable affinity for metals, particularly heavy metals in solution.

記述言語：英語  

担当ページ：9781118496305, 63-77   記述言語：英語  

One of the most serious problems facing billions of people today is the availability of fresh water. The conventional water recycling methods like chemical oxidation processes and advanced oxidation processes (AOP) are eff ective but have problems such as high cost, secondary pollution and production of chlorinated species. To overcome these problems nanoparticles are increasingly used. The conventional methods of nanoparticle production usually requires a long time and have a high cost, which render them ineff ective for large-scale production of nanoparticles. Nanoparticle production using the plasma technique overcomes these shortcomings. Additionally, the plasma itself acts as a perfect method for water purification due to the formation of various reactive chemical species such as radicals (OH·, H·, O·, HO ₂ ·) and molecular species (H ₂ O ₂ , H ₂ , O ₂ ). Hence, the use of the combined action of nanoparticles and plasma is a new method for solving water treatment problems.

DOI： 10.1002/9781118939314.ch4

開催年月日： 2024年9月

記述言語：英語   会議種別：口頭発表（招待・特別）  

開催地：Miyakojima   国名：日本国  

開催年月日： 2024年7月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：Iwate University, Morioka   国名：日本国  

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：タイ王国  

According to a report by the Energy Information Administration of the U.S. Department of Energy, global energy consumption will rise 28% between 2015 and 2040. (EIA). The most promising method of reducing greenhouse gases in the short to medium term is the conversion of CO2 into sustainable carbonaceous fuels. CO2 is a prospective C1 feedstock that is abundant, affordable, and renewable. It can be used to create high-value compounds like CO. Soil fertility management is vital for farmers. Synthetic Nitrogen (N)-fertilizer has increased by 20-fold in the last 50 years to feed the increasingly hungry population. Nonthermal plasma is a better option, as it can convert CO2 and N2 conversion at near-ambient temperatures. The reduction of CO2 with H2O is carried out using the streamer plasma and the possible production of organic compounds in the liquid phase and the formation of CO in the gas phase. The measured net conversion of CO2 to CO was close to 2 % under optimal conditions. Additionally, we synthesize the N-enriched plant soil (NH4NO3 fertilizer in soil) using the low-temperature and low-pressure plasma [without H2 and external catalyst]. Subsequently, we used plasma N-enriched soil to grow plants (radish and tomato)—the plasma N-enriched soil treatment resulted in significant growth enhancement for both radish and tomato plants. Further, substantial changes in phytohormone and antioxidant levels were observed for the plants grown in plasma N-enriched soil compared to control soil and soil + commercial N-fertilizer. We also performed the 1D and 2D simulations using COMSOL Multiphysics® software to determine how the potential reaction generated the gas phase

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：日本国  

According to a report by the Energy Information Administration of the U.S. Department of Energy, global energy consumption would rise 28% between 2015 and 2040. (EIA). The EIA analysis predicts that over the same time period, energy-related carbon dioxide (CO2) emissions will rise by 16%, from 33.9 billion metric tonnes in 2015 to 39.3 billion metric tonnes in 2040, to match the rise in energy demand. The most promising method of reducing greenhouse gases in the short to medium term is the conversion of CO2 into sustainable carbonaceous fuels. CO2 is a prospective C1 feedstock that is abundant, affordable, and renewable that can be used to create high-value compounds like CO. Nonthermal plasma is a better option, as it can convert CO2 at near-ambient temperature and pressure [1-3]. The reduction of CO2 with H2O carried using the streamer plasma and possible production of organic compounds in liquid phase and formation CO in gas phase. The measured net conversion of CO2 to CO was close to 4 % under optimal conditions. Although we also performed the 2D simulation using COMSOL Multiphysics® software to determine how the potential reaction generated gas phase were diffuse to liquid phase.

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：日本国  

A proposed technique to convert sporadic sustainable electricity into storable chemical energy is the conversion of CO2 into CO via plasma processing. The two most significant obstacles to developing this technology are proving its viability on an industrial scale and obtaining an effective CO2 conversion with high energy efficiency. In this work, we developed the plasma reactor for effective CO2 conversion. The transformation of CO is monitored by using Fourier Transform Infrared Spectroscopy.

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：大韓民国  

According to a report by the Energy Information Administration of the U.S. Department of Energy, global energy consumption will rise 28% between 2015 and 2040. (EIA). The most promising method of reducing greenhouse gases in the short to medium term is the conversion of CO2 into sustainable carbonaceous fuels. CO2 is a prospective C1 feedstock that is abundant, affordable, and renewable. It can be used to create high-value compounds like CO. Soil fertility management is of great importance for farmers. The use of synthetic Nitrogen (N)-fertilizer increased by 20 folds in the last 50 years to feed the increasingly hungry population. Nonthermal plasma is a better option, as it can convert CO2 and N2 conversion at near-ambient temperatures [1-3]. The reduction of CO2 with H2O is carried out using the streamer plasma and the possible production of organic compounds in the liquid phase and the formation of CO in the gas phase. The measured net conversion of CO2 to CO was close to 2 % under optimal conditions. Additionally, we synthesize the N-enriched plant soil (NH4NO3 fertilizer in soil) using the low-temperature and low-pressure plasma [without H2 and external catalyst]. Subsequently, we used plasma N-enriched soil to grow plants (radish and tomato)—the plasma N-enriched soil treatment resulted in significant growth enhancement for both radish and tomato plants. Further, substantial changes in phytohormone and antioxidant levels were observed for the plants grown in plasma N-enriched soil compared to control soil and soil + commercial N-fertilizer. We also performed the 1D and 2D simulations using COMSOL Multiphysics® software to determine how the potential reaction generated the gas phase

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：日本国  

Biochemical studies of tissue reveal that the endogenous levels of antioxidant enzymes vary greatly across tissue types; this reflects differences in development and metabolism across different organ systems. In most cancer cells, the intrinsic levels of antioxidant enzymes are low compared to healthy or non-transformed cells. This suggests that most cancer cells lack the biochemical machinery to metabolize H2O2 effectively. Plasma medicine is a new field that uses cold atmospheric plasma (CAP) for various medical applications, such as sterilization, wound healing, blood coagulation, and cancer treatment. CAP interacts with the oxygen, nitrogen, water, etc., in the air to produce various radical and non-radical species, for example, hydroxyl radicals (•OH), superoxide (O2•−), singlet oxygen (1O2), nitrogen dioxide (NO2), hypochlorite (ClO−), atomic oxygen (O), and nitric oxide (NO). During the plasma–liquid interactions, some relatively long-lifetime reactive species are generated in liquid, such as hydrogen peroxide (H2O2), nitrites (NO2−), and nitrates (NO3−). To understand the CAP mechanism in the complex bio-organism, it is essential to understand CAP action on the proteins.

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：日本国  

Biochemical studies of tissue reveal that the endogenous levels of antioxidant enzymes vary greatly across tissue types; this reflects differences in development and metabolism across different organ systems. In most cancer cells, the intrinsic levels of antioxidant enzymes are low compared to healthy cells or non-transformed cells. This suggests that most cancer cells lack the biochemical machinery to metabolize H2O2 effectively. Plasma medicine is a new field that uses cold atmospheric plasma (CAP) for various medical applications, such as sterilization, wound healing, blood coagulation, and cancer treatment. CAP interacts with the oxygen, nitrogen, water, etc., in air to produce various radical and non-radical species, for example, hydroxyl radicals (•OH), superoxide (O2•−), singlet oxygen (1O2), nitrogen dioxide (NO2), hypochlorite (ClO−), atomic oxygen (O), and nitric oxide (NO). During the plasma–liquid interactions, some relatively long-lifetime reactive species are generated in liquid, such as hydrogen peroxide (H2O2), nitrites (NO2−), and nitrates (NO3−). To understand the CAP mechanism in the complex bio-organism, it is important to understand the CAP action of proteins. To understand the plasma treatment effect on the structure and activity of catalase, we treated bovine liver catalase using pulsed DBD and Jet for 5, 10, and 20 min. We investigated the structural and thermodynamic changes in catalase through UV-visible, fluorescence, and circular dichroism spectroscopies after DBD and Jet plasma treatments at various time intervals. We have also performed mass spectrometry analysis to reveal the possible modified amino acids in catalase after both types of plasma treatments (DBD and jet). The jet plasma treatment modifies the catalase structure to a greater extent than the DBD plasma. Additionally, we performed molecular dynamics simulations based on the mass spectrometry analysis to gain insight into the structural deformation of catalase. Finally, we have observed that inhibition of catalase enzyme in A375 cancer cells increases the plasma treatment (DBD and jet) efficiency. Molecular dynamic simulation studies show more change in RMSD for catalase after Jet treatment than DBD treatment. Therefore, we conclude that the enzymatic activity of catalase in cancer cells decreases after plasma treatment.

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：日本国  

Plasma medicine represents an emerging field harnessing the power of cold atmospheric plasma (CAP) across a wide range of medical applications, including sterilization, wound healing, blood coagulation, and cancer treatment. CAP interacts dynamically with elements like oxygen, nitrogen, and water in the air, giving rise to a spectrum of radical and non-radical species, including hydroxyl radicals (•OH), superoxide (O2•−), singlet oxygen (1O2), nitrogen dioxide (NO2), hypochlorite (ClO−), atomic oxygen (O), and nitric oxide (NO). During plasma-liquid interactions, certain relatively long-lived reactive species emerge within the liquid, such as hydrogen peroxide (H2O2), nitrites (NO2−), and nitrates (NO3−). Understanding the impact of CAP on complex bio-organisms necessitates a comprehensive grasp of CAP's influence on proteins. The majority of proteins adopt highly compact folded structures, optimizing the polypeptide chain's free energy in conjunction with the surrounding solvent under physiological conditions. In some instances, cells utilize organic osmolytes alongside inorganic solutes, as excessive concentrations of inorganic salts (Na+ or K+) can disrupt protein function, while organic solutes remain innocuous. Proper protein conformation holds pivotal significance for cell viability under physiological conditions. Organic osmolytes facilitate protein folding by shifting the folding equilibrium, thus offering the potential to alleviate challenging diseases stemming from protein misfolding. Protein misfolding threatens cellular homeostasis through either protein degradation or aggregation, culminating in deleterious genetic disorders. Hence, co-solvents like naturally occurring osmolytes or synthetically produced ionic liquids can serve to stabilize protein folding and function, directing the folding equilibrium away from protein aggregation and/or degradation. Consequently, our research has delved into the impact of CAP on various proteins, including myoglobin, MTH1880, NOXA-SH3 domain, catalase, and G protein-coupled receptors (GPCRs), to elucidate the protein folding mechanisms. Furthermore, we have explored the influence of osmolytes and ionic liquids on protein folding in plasma treatment through a combination of experimental techniques and molecular dynamics simulations. Our experimental investigations have unveiled that amino acid oxidation within proteins increases proportionally with the duration of plasma treatment and pH of solution. This oxidation level significantly affects protein structure and function. In select cases, osmolytes/ionic liquids have shown the capability to shield against the detrimental effects of CAP treatment, although the extent of protection varies depending on the specific protein. In conclusion, co-solvents afford a degree of protection against CAP's impact on bio-organisms. These discoveries shed new light on the interplay between ROS/RNS and proteins, whether co-solvents are present or absent

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：タイ王国  

The use of cold atmospheric plasma (CAP) treatment of seeds benefits over conventional treatments due to short treatment time and low-temperature operations. During CAP interacts with the oxygen, nitrogen, water, etc., in air, they produce various radical and non-radical species. It is a general fact that reactive species like reactive oxygen and nitrogen species (RONS) can influence plant growth and development. The increased nitrogen nutrients level influences growth hormones, activation of growth-related gene expression, and other physiological processes to understand the plasma effect on seedling growth. Additionally, the presence of RONS can disrupt redox homeostasis and cause mild oxidative stress in plants during vegetative and reproductive stages. Electron paramagnetic resonance (EPR) spectroscopy is optimal for interpreting any change in paramagnetic defect centers. The use of free radical species as precursors to identify the changes in the biological systems due to physical or chemical stress. The detection of the change in paramagnetic species before and after seed treatment is of great interest. Therefore, we used EPR spectroscopy in this study to detect the changes that occurred in seeds before and after plasma treatment. We observed that scalar DBD treatment on radish sprout seed coat increases organic free radical intensity. The weak peak at g = 4.3 represents the signal for Fe3+, hyperfine lines belonging to the Mn2+ peaks, and an intense sharp rise at g = 2.0 attributed to the semiquinone radical. Further, we treated seeds that matured under heat stress with CAP and found that subsequent germination was significantly restored; genes involved in ABA biosynthesis (OsNCED2 and OsNCED5) were downregulated, whereas genes involved in ABA catabolism (OsABA8′OH1 and OsABA8′OH3) and α-amylase genes (OsAmy1A, OsAmy1C, OsAmy3B, and OsAmy3E) were upregulated. CAP treatment caused sig0.5nificant hypermethylation of the OsNCED5 promoter and hypomethylation of OsAmy1C and OsAmy3E promoters, which matched their expression patterns. We suggest that CAP treatment can significantly improve the germination of rice seeds affected by heat stress by affecting epigenetic regulation.

開催年月日： 2024年5月

記述言語：英語   会議種別：シンポジウム・ワークショップ パネル（公募）  

国名：インド  

Biochemical studies of tissue reveal that the endogenous levels of antioxidant enzymes vary greatly across tissue types; this reflects differences in development and metabolism across different organ systems. In most cancer cells, the intrinsic levels of antioxidant enzymes are low compared to healthy or non-transformed cells. This suggests that most cancer cells lack the biochemical machinery to metabolize H2O2 effectively. Plasma medicine is a new field that uses cold atmospheric plasma (CAP) for various medical applications, such as sterilization, wound healing, blood coagulation, and cancer treatment. CAP interacts with the oxygen, nitrogen, water, etc., in the air to produce various radical and non-radical species, for example, hydroxyl radicals (•OH), superoxide (O2•−), singlet oxygen (1O2), nitrogen dioxide (NO2), hypochlorite (ClO−), atomic oxygen (O), and nitric oxide (NO). During the plasma–liquid interactions, some relatively long-lifetime reactive species are generated in liquid, such as hydrogen peroxide (H2O2), nitrites (NO2−), and nitrates (NO3−). To understand the CAP mechanism in the complex bio-organism, it is essential to understand CAP action on the proteins. To understand the effect of plasma treatment on the structure and activity of catalase, we treated bovine liver catalase using CAP for 5, 10, and 20 min. We investigated the structural and thermodynamic changes in catalase through UV-visible, fluorescence, and circular dichroism spectroscopies after CAP plasma treatments at various time intervals. We have also performed mass spectrometry analysis to reveal the possible modified amino acids in catalase after both types of plasma treatments. Additionally, we performed molecular dynamics simulations based on mass spectrometry analysis to gain insight into the structural deformation of proteins and enzymes. Molecular dynamic simulation studies show more change in RMSD for enzymes after CAP treatment compared to the control structure. Therefore, we conclude that enzymes' enzymatic activity and structure change after plasma treatment.

開催年月日： 2024年5月

記述言語：英語  

国名：日本国  

We hypothesize that the atmospheric pressure non-thermal plasma (simply plasma) can aid in the conversion of CO2 and N2 to plant nutrients via plasma-treated/activated water (PTW). We treated the radish seeds with CO2-generated PTW and N2-generated PTW to determine the germination rate, germination percentage, and seeding growth. We suggested that CO and H2O2 formed during CO2-generated PTW production trigger early germination and growth enhancement.