九州大学-研究者情報 [ATTRI PANKAJ (学術研究員) システム情報科学研究院 I&Eビジョナリー特別部門]

ATTRI PANKAJ（あたりぱんかじ）

データ更新日：2024.04.19

学術研究員　／　システム情報科学研究院 I&Eビジョナリー特別部門

原著論文

1.	Sung Ho Kim, Soyeon Kim, Namwook Kim, Pankaj Attri, In Tae Kim, The increase in diffraction efficiency of an azobenzene side-chain polymer using imidazolium and ammonium ionic liquids, Journal of Saudi Chemical Society, 10.1016/j.jscs.2022.101485, 26, 3, 2022.05, 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..
2.	Seema Garg, Rohit Bhatia, Pankaj Attri, Black but gold: Carbon nanomaterials for waste water purification, Nanomaterials for Water Remediation, 10.1515/9783110650600-003, 42-92, 2020.06.
3.	Zhitong Chen, Pankaj Attri, Qiu Wang, Special Issue on “Advances in Plasma Diagnostics and Applications”, Processes, 10.3390/pr10040654, 10, 4, 2022.04.
4.	Tika E. Putri, Fadzai L. Chawarambwa, Pankaj Attri, Kunihiro Kamataki, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Performance comparison of nitrile-based liquid electrolytes on bifacial dye-sensitized solar cells under low-concentrated light, MRS Advances, 10.1557/s43580-022-00270-x, 7, 21, 427-432, 2022.05, 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.].
5.	Davronjon Abduvokhidov, Maksudbek Yusupov, Aamir Shahzad, Pankaj Attri, Masaharu Shiratani, Maria C. Oliveira, Jamoliddin Razzokov, Unraveling the Transport Properties of RONS across Nitro-Oxidized Membranes, Biomolecules, 10.3390/biom13071043, 13, 7, 2023.07, 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..
6.	Jamoliddin Razzokov, Sunnatullo Fazliev, Akbar Kodirov, Pankaj Attri, Zhitong Chen, Masaharu Shiratani, Mechanistic Insight into Permeation of Plasma-Generated Species from Vacuum into Water Bulk, International Journal of Molecular Sciences, 10.3390/ijms23116330, 23, 11, 2022.06, 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..
7.	A. El-Tayeb, Takamasa Okumura, Pankaj Attri, Kunihiro Kamataki, Kazunori Koga, Masaharu Shiratani, Reaction kinetics studies for phenol degradation under the impact of different gas bubbles and pH using gas-liquid discharge plasma, Japanese Journal of Applied Physics, 10.35848/1347-4065/acebfb, 62, SN, 2023.11, 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..
8.	Maksudbek Yusupov, Debbie Dewaele, Pankaj Attri, Umedjon Khalilov, Frank Sobott, Annemie Bogaerts, Molecular understanding of the possible mechanisms of oligosaccharide oxidation by cold plasma, Plasma Processes and Polymers, 10.1002/ppap.202200137, 20, 2, 2023.02, 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..
9.	Xufeng Li, Leiyu Zhang, Aamir Shahzad, Pankaj Attri, Quanzhi Zhang, Investigation of Plasma Propagation in Packed-Bed Dielectric Barrier Discharge Based on a Customized Particle-in-Cell/Monte Carlo Collision Model, Plasma, 10.3390/plasma6040044, 6, 4, 637-648, 2023.12, 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..
10.	Takamasa Okumura, Hayate Tanaka, Takumi Nakao, Teruki Anan, Ryo Arita, Masaki Shiraki, Kayo Shiraki, Tomoyuki Miyabe, Daisuke Yamashita, Kayo Matsuo, Pankaj Attri, Kunihiro Kamataki, Naoto Yamashita, Naho Itagaki, Masaharu Shiratani, Satoshi Hosoda, Akiyo Tanaka, Yushi Ishibashi, Kazunori Koga, Health assessment of rice cultivated and harvested from plasma-irradiated seeds, Scientific Reports, 10.1038/s41598-023-43897-y, 13, 1, 2023.12, 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..
11.	Pankaj Attri, Takamasa Okumura, Nozomi Takeuchi, Kunihiro Kamataki, Kazunori Koga, Masaharu Shiratani, Influence of humidity on the plasma-assisted CO2 conversion, Plasma Processes and Polymers, 10.1002/ppap.202300141, 21, 1, 2024.01, 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..
12.	Shoko Tsuboyama, Takamasa Okumura, Pankaj Attri, Kazunori Koga, Masaharu Shiratani, Kazuyuki Kuchitsu, Growth control of Marchantia polymorpha gemmae using nonthermal plasma irradiation, Scientific Reports, 10.1038/s41598-024-53104-1, 14, 1, 3172, 2024.02, 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..
13.	Maksudbek Yusupov, Debbie Dewaele, Pankaj Attri, Umedjon Khalilov, Frank Sobott, Annemie Bogaerts, Molecular understanding of the possible mechanisms of oligosaccharide oxidation by cold plasma, Plasma Processes and Polymer, 10.1002/ppap.202200137, 20, e2200137, 2023.09.
14.	Sung Ho Kim, Soyeon Kim, Namwook Kim, Pankaj Attri, In Tae Kim, The increase in diffraction efficiency of an azobenzene side-chain polymer using imidazolium and ammonium ionic liquids, Journal of Saudi Chemical Society, 10.1016/j.jscs.2022.101485, 26, 101485, 2022.05.
15.	Jamoliddin Razzokov,Sunnatullo Fazliev,Akbar Kodirov,Pankaj Attri, Zhitong Chen and Masaharu Shiratani , Mechanistic Insight into Permeation of Plasma-Generated Species from Vacuum into Water Bulk, Int. J. Mol. Sci., 10.3390/ijms23116330, 23, 11, 6330, 2022.06, [URL].
16.	Pankaj Attri, Kazunori Koga, Hirofumi Kurita, Kenji Ishikawa, Masaharu Shiratani, Editorial: Prospects of plasma generated species interaction with organic and inorganic materials, Frontiers in Physics, 10.3389/fphy.2022.1118018, 10, 2023.01.
17.	Pankaj Attri, Kazunori Koga, Takamasa Okumura, Fadzai L. Chawarambwa, Tika E. Putri, Yuichi Tsukada, Kunihiro Kamataki, Naho Itagaki, Masaharu Shiratani, Treatment of organic wastewater by a combination of non-thermal plasma and catalyst: a review, Reviews of Modern Plasma Physics, 10.1007/s41614-022-00077-1, 6, 1, 2022.07.
18.	Takamasa Okumura, Pankaj Attri, Kunihiro Kamataki, Naoto Yamashita, Yuichi Tsukada, Naho Itagaki, Masaharu Shiratani, Yushi Ishibashi, Kazuyuki Kuchitsu, Kazunori Koga, Detection of NO3− introduced in plasma-irradiated dry lettuce seeds using liquid chromatography-electrospray ionization quantum mass spectrometry (LC-ESI QMS), Scientific Reports, 10.1038/s41598-022-16641-1, 12, 1, 2022.07, 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..
19.	Pankaj Attri, Takamasa Okumura, Kazunori Koga, Masaharu Shiratani, Douyan Wang, Katsuyuki Takahashi, Koichi Takaki, Outcomes of Pulsed Electric Fields and Nonthermal Plasma Treatments on Seed Germination and Protein Functions, Agronomy, 10.3390/agronomy12020482, 12, 2, 2022.02, 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..
20.	Fadzai Lesley Chawarambwa, Tika Erna Putri, Sung Hwa Hwang, Pankaj Attri, Kunihiro Kamataki, Naho Itagaki, Kazunori Koga, Daisuke Nakamura, Masaharu Shiratani, Improved luminescence performance of Yb³⁺-Er³⁺-Zn²⁺: Y2O3 phosphor and its application to solar cells, Optical Materials, 10.1016/j.optmat.2021.111928, 123, 2022.01, 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..
21.	Toshiro Kaneko, Hiromitsu Kato, Hideaki Yamada, Muneaki Yamamoto, Tomoko Yoshida, Pankaj Attri, Kazunori Koga, Tomoyuki Murakami, Kazuyuki Kuchitsu, Sugihiro Ando, Yasuhiro Nishikawa, Kentaro Tomita, Ryo Ono, Tsuyohito Ito, Atsushi M. Ito, Koji Eriguchi, Tomohiro Nozaki, Takayoshi Tsutsumi, Kenji Ishikawa, Functional nitrogen science based on plasma processing: Quantum devices, photocatalysts and activation of plant defense and immune systems, Japanese Journal of Applied Physics, 10.35848/1347-4065/ac25dc, 61, SA, 2022.01, 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..
22.	C. Suriyasak, K. Hatanaka, H. Tanaka, T. Okumura, D. Yamashita, P. Attri, K. Koga, M. Shiratani, N. Hamaoka, Y. Ishibashi, Alterations of DNA Methylation Caused by Cold Plasma Treatment Restore Delayed Germination of Heat-Stressed Rice (Oryza sativa L.) Seeds, ACS Agric. Sci. Technol., 10.1021/acsagscitech.0c00070, 1, 1, 2021.02.
23.	Sung Hwa Hwang, Kazunori Koga, Yuan Hao, Pankaj Attri, Takamasa Okumura, Kunihiro Kamataki, Naho Itagaki, Masaharu Shiratani, Jun Seok Oh, Susumu Takabayashi, Tatsuyuki Nakatani, Time of flight size control of carbon nanoparticles using ar+ch4 multi-hollow discharge plasma chemical vapor deposition method, Processes, 10.3390/pr9010002, 9, 1, 1-10, 2021.01, 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..
24.	Pankaj Attri, Kazunori Koga, Masaharu Shiratani, Possible impact of plasma oxidation on the structure of the C-terminal domain of SARS-CoV-2 spike protein: A computational study, Applied Physics Express, 10.35848/1882-0786/abd717, 14, 2, 2021.02, 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..
25.	Pankaj Attri, Nagendra Kumar Kaushik, Neha Kaushik, Dietmar Hammerschmid, Angela Privat-Maldonado, Joey De Backer, Masaharu Shiratani, Eun Ha Choi, Annemie Bogaerts, Plasma treatment causes structural modifications in lysozyme, and increases cytotoxicity towards cancer cells, International Journal of Biological Macromolecules, 10.1016/j.ijbiomac.2021.05.146, 182, 1724-1736, 2021.07, 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..
26.	Tika E. Putri, Fadzai L. Chawarambwa, Min Kyu Son, Pankaj Attri, Kunihiro Kamataki, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Performance Characteristics of Bifacial Dye-Sensitized Solar Cells with a V-Shaped Low-Concentrating Light System, ACS Applied Energy Materials, 10.1021/acsaem.1c02774, 4, 12, 13410-13414, 2021.12, 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)..
27.	Pankaj Attri, Kenji Ishikawa, Takamasa Okumura, Kazunori Koga, Masaharu Shiratani, Vida Mildaziene, Impact of seed color and storage time on the radish seed germination and sprout growth in plasma agriculture, Scientific Reports, 10.1038/s41598-021-81175-x, 11, 1, 2021.12, 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..
28.	Pankaj Attri, Kazunori Koga, Takamasa Okumura, Masaharu Shiratani, Impact of atmospheric pressure plasma treated seeds on germination, morphology, gene expression and biochemical responses, Japanese Journal of Applied Physics, 10.35848/1347-4065/abe47d, 60, 4, 2021.04, 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..
29.	Pankaj Attri, Hirofumi Kurita, Kazunori Koga, Masaharu Shiratani, Impact of Reactive Oxygen and Nitrogen Species Produced by Plasma on Mdm2–p53 Complex, International Journal of Molecular Sciences, 10.3390/ijms22179585, 22, 17, 9585-9585, 2021.09, 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..
30.	Fadzai Lesley Chawarambwa, Tika Erna Putri, Pankaj Attri, Kunihiro Kamataki, Naho Itagaki, Kazunori Koga, Masaharu Shiratani, Highly efficient and transparent counter electrode for application in bifacial solar cells, Chemical Physics Letters, 10.1016/j.cplett.2021.138369, 768, 2021.04, 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..
31.	Chang Hyun Song, Pankaj Attri, Sae Kwang Ku, Ihn Han, Annemie Bogaerts, Eun Ha Choi, Cocktail of reactive species generated by cold atmospheric plasma: Oral administration induces non-small cell lung cancer cell death, Journal of Physics D: Applied Physics, 10.1088/1361-6463/abdff2, 54, 18, 2021.05, 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..
32.	Seunghyun Jeong, Joon Ho Yoon, Pankaj Attri, In Tae Kim, Changes in the physical properties of low bandgap polymer after interaction with ionic liquids, Journal of Saudi Chemical Society, 10.1016/j.jscs.2021.101227, 25, 5, 2021.05, 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..
33.	Pankaj Attri, Jae-Hyun Park, Joey De Backer, Myeongkyu Kim, Ji-Hye Yun, Yunseok Heo, Sylvia Dewilde, Masaharu Shiratani, Eun Ha Choi, Weontae Lee, Annemie Bogaerts, Structural modification of NADPH oxidase activator (Noxa 1) by oxidative stress An experimental and computational study, International Journal of Biological Macromolecules, 10.1016/j.ijbiomac.2020.09.120, 163, 2405-2414, 2020.09, [URL], 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..
34.	Pankaj Attri, Kenji Ishikawa, Takamasa Okumura, Kazunori Koga, Masaharu Shiratani, Plasma agriculture from laboratory to farm A review, Processes, 10.3390/PR8081002, 8, 8, 2020.08, [URL], 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..
35.	Pankaj Attri, Sooho Choi, Minsup Kim, Masaharu Shiratani, Art E. Cho, Weontae Lee, Influence of alkyl chain substitution of ammonium ionic liquids on the activity and stability of tobacco etch virus protease, International Journal of Biological Macromolecules, 10.1016/j.ijbiomac.2020.03.175, 155, 439-446, 2020.07, [URL], 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..
36.	Kazunori Koga, Pankaj Attri, Kunihiro Kamataki, Naho Itagaki, Masaharu Shiratani, Vida Mildaziene, Impact of radish sprouts seeds coat color on the electron paramagnetic resonance signals after plasma treatment, Japanese Journal of Applied Physics, 10.35848/1347-4065/ab7698, 59, SHHF01, 2020.05, [URL], 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..
37.	Pankaj Attri, Jamoliddin Razzokov, Maksudbek Yusupov, Kazunori Koga, Masaharu Shiratani, Annemie Bogaerts, Influence of osmolytes and ionic liquids on the Bacteriorhodopsin structure in the absence and presence of oxidative stress A combined experimental and computational study, International Journal of Biological Macromolecules, 10.1016/j.ijbiomac.2020.01.179, 148, 657-665, 2020.04, [URL], 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..
38.	Pankaj Attri, Carbon Nanotubes (CNTs): A Potential Nanomaterial for Water Purification, Journal of Composites Science, 10.3390/jcs4030135, 135, 2020, [URL], 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..
39.	Pankaj Attri and Annemie Bogaerts, Perspectives of Plasma-treated Solutions as Anticancer Drugs, Anti-Cancer Agents in Medicinal Chemistry, 10.2174/187152061904190521102345, 19, 436-438, Year: 2019 Volume: 19 First Page: 436 Last Page: 438, 2019.07, [URL].
40.	B. Ghimire, E.J. Szili, P. Lamichhane, R. D. Short, J. S. Lim, Pankaj Attri, K. Masur, K.-D. Weltmann, S.-H. Hong, E. H. Choi, The role of UV photolysis and molecular transport in the generation of reactive species in a tissue model with a cold atmospheric pressure plasma jet, Appl. Phys. Lett. , 114, 093701, 2019.03.
41.	Pankaj Attri, Cold Atmospheric Plasma Activated Solution: A New Approach for Cancer Treatment, Anti-Cancer Agents in Medicinal Chemistry, 18, 768, 2018.10.
42.	P. Shaw, N. Kumar, H. S. Kwak, J. H. Park, H. S. Uhm, A. Bogaerts, E. H. Choi and Pankaj Attri , Bacterial inactivation by plasma treated water enhanced by reactive nitrogen species, SCIENTIFIC REPORTS, 10.1038/s41598-018-29549-6, 8, 8, 11268, 2018.07.
43.	Pankaj Attri, J. Han, S. Choi, E. H. Choi, A. Bogaerts and Weontae Lee, CAP modifies the structure of a model protein from thermophilic bacteria: mechanisms of CAP-mediated inactivation, SCIENTIFIC REPORTS, 10.1038/s41598-018-28600-w, 8, 8, 10218, 2018.07.
44.	N. Kumar, Pankaj Attri, S. Dewilde and A. Bogaerts, Inactivation of human pancreatic ductal adenocarcinoma with atmospheric plasma treated media and water: a comparative study, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 10.1088/1361-6463/aac571, 51, 25, 51, 255401, 2018.06.
45.	D. U. Lee, J. Y. Jeong, J. W. Han, G.-C. Kwon, Pankaj Attri and I. T. Kim, Effect of Ionic Liquids on the Physical Properties of the Newly Synthesized Conducting Polymer, INTERNATIONAL JOURNAL OF POLYMER SCIENCE, 10.1155/2018/8275985, 2018, Article ID 8275985, 2018.06.
46.	Pankaj Attri, J. H. Park, A. Ali, E. H. Choi, How Does Plasma Activated Media Treatment Differ From Direct Cold Plasma Treatment?, ANTI-CANCER AGENTS IN MEDICINAL CHEMISTRY, 10.2174/1871520618666180406121734, 18, 6, 805-814, 18, 805, 2018.05.
47.	S. H. Kim, Pankaj Attri and In Tae Kim, Improvement in the diffraction efficiency of a polymer using an ionic liquid, JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 10.2298/JSC170527107K, 83, 2, 213-220, 83, 213, 2018.04.
48.	N. Kumar, P. Shaw, J. Razzokov, M. Yusupov, Pankaj Attri, H. S. Uhm, E. H. Choi and A. Bogaerts, Enhancement of cellular glucose uptake by reactive species: a promising approach for diabetes therapy, RSC ADVANCES, 10.1039/c7ra13389h, 8, 18, 9887-9894, 8, 9887, 2018.03.
49.	Pankaj Attri, F. Tochikubo, J. H. Park, E. H. Choi, K. Koga and M. Shiratani, Impact of Gamma rays and DBD plasma treatments on wastewater treatment, SCIENTIFIC REPORTS, 10.1038/s41598-018-21001-z, 8, 8, 2926, 2018.02.
50.	Pankaj Attri, Cold atmospheric plasma activated solution A new approach for cancer treatment, Anti-Cancer Agents in Medicinal Chemistry, 10.2174/187152061806181112124717, 18, 6, 2018.01, [URL].
51.	Bharti Arora, Ji Hoon Park, Eun Ha Choi, Pankaj Attri, Sol-gel-based bioceramics From materials to medicine, Smart Ceramics Preparation, Properties, and Applications, 10.1201/9781315163598, 431-442, 2018.01, [URL], 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..
52.	Pankaj Attri, M. Kim, E. H. Choi, A. E. Cho, K. Koga and M. Shiratani, Impact of an ionic liquid on protein thermodynamics in the presence of cold atmospheric plasma and gamma rays, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 10.1039/c7cp04083k, 19, 37, 25277-25288, 19, 25277, 2017.10.
53.	Pankaj Attri, M. Kim, T. Sarinont, E. H. Choi, H. Seo, A. E. Cho, K. Koga and M. Shiratani, The protective action of osmolytes on the deleterious effects of gamma rays and atmospheric pressure plasma on protein conformational changes, SCIENTIFIC REPORTS, 10.1038/s41598-017-08643-1, 7, 7, 8689, 2017.08.
54.	Y. Lee, Pankaj Attri, S. Kim, S. Lee, J. Kim, T. Cho and I. T. Kim, Photovoltaic properties of novel thiophene- and selenophene-based conjugated low bandgap polymers: a comparative study, NEW JOURNAL OF CHEMISTRY, 10.1039/c7nj00151g, 41, 14, 6315-6321, 41, 6315, 2017.07.
55.	Pankaj Attri, J. Gaur, S. Choi, M. Kim, R. Bhatia, N. Kumar, J. H. Park, A. E. Cho, E. H. Choi and W. Lee, Interaction studies of carbon nanomaterials and plasma activated carbon nanomaterials solution with telomere binding protein, SCIENTIFIC REPORTS, 10.1038/s41598-017-02690-4, 7, 7, 2636, 2017.06.

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