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Rhamnus crenata leaf extracts exhibit anti-inflammatory activity via modulating the Nrf2/HO-1 and NF-κB/MAPK signaling pathways

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Asian Pacific Journal of Tropical Biomedicine 2022年第10期12卷 430-436页

作者： Hyun Ji Eo Da Som Kim gwang hun park Special Forest Resources Division Department of Forest Bio-ResourcesNational Institute of Forest ScienceSuwon 16631Korea Forest Medicinal Resources Research Center National Institute of Forest ScienceYeongju 36040Korea

Objective:To elucidate the potential anti-inflammatory mechanisms of Rhamnus crenata leaf extracts using RAW264.7 ***:We used 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide assay to measure cell *** oxide(NO)production was measured using Griess *** blotting and RT-PCR assays were carried out for analyzing the protein and gene expressions of pro-inflammatory mediators,***,PD98059(ERK1/2 inhibitor),SB203580(p38 inhibitor),SP600125(JNK inhibitor),and BAY11-7082(NF-κB inhibitor)were used to evaluate the anti-inflammatory mechanism of Rhamnus crenata leaf ***:Rhamnus crenata leaf extracts significantly inhibited the production of the pro-inflammatory mediators such as NO,iNOS,COX-2,IL-1β,and TNF-αin lipopolysaccharide(LPS)-stimulated RAW264.7 *** crenata leaf extracts also suppressed LPS-induced degradation of IκB-αand nuclear accumulation of p65,which resulted in the inhibition of NF-κB activation in RAW264.7 ***,the extracts attenuated the phosphorylation of p38,ERK1/2,and JNK in LPS-stimulated RAW264.7 ***,HO-1 expression induced by Rhamnus crenata leaf extracts was significantly downregulated by SB230580,PD98059,SP600125 and ***:Rhamnus crenata leaf extract may upregulate HO-1 expression through inhibition of p38,ERK1/2,and NF-κB activation,which may contribute to the anti-inflammatory activity of the *** crenata leaf extracts may have great potential for the development of anti-inflammatory drugs to treat acute and chronic inflammatory diseases.

关键词： Anti-inflammatory activity Heme oxygenase-1 Nrf2 Mitogen-activated protein kinase Nuclear factor kappa B Rhamnus crenata

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Towards high-performance and robust anion exchange membranes(AEMs)for water electrolysis:Super-acid-catalyzed synthesis of AEMs

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Journal of Energy Chemistry 2024年第6期93卷 478-510,I0012页

作者： Geun Woong Ryoo Sun Hwa park Ki Chang Kwon Jong hun Kang Ho Won Jang Min Sang Kwon Department of Materials Science and Engineering Research Institute of Advanced Materials(RIAM)Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea Department of Chemical and Biological Engineering and Institute of Chemical ProcessSeoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

The increasing demand for hydrogen energy to address environmental issues and achieve carbon neutrality has elevated interest in green hydrogen production,which does not rely on fossil *** various hydrogen production technologies,anion exchange membrane water electrolyzer(AEMWE)has emerged as a next-generation technology known for its high hydrogen production efficiency and its ability to use non-metal ***,this technology faces significant challenges,particularly in terms of the membrane durability and low ionic *** address these challenges,research efforts have focused on developing membranes with a new backbone structure and anion exchange groups to enhance durability and ionic ***,the super-acid-catalyzed condensation(SACC)synthesis method stands out due to its user convenience,the ability to create high molecular weight(MW)polymers,and the use of oxygen-tolerant organic *** the synthesis of anion exchange membranes(AEMs)using the SACC method began in 2015,and despite growing interest in this synthesis approach,there remains a scarcity of review papers focusing on AEMs synthesized using the SACC *** review covers the basics of SACC synthesis,presents various polymers synthesized using this method,and summarizes the development of these polymers,particularly their building blocks including aryl,ketone,and anion exchange *** systematically describe the effects of changes in the molecular structure of each polymer component,conducted by various research groups,on the mechanical properties,conductivity,and operational stability of the *** review will provide insights into the development of AEMs with superior performance and operational stability suitable for water electrolysis applications.

关键词： Green hydrogen production Water electrolysis Anion exchange membrane water electrolyzer(AEMWE) Anion exchange membranes(AEMs) Super-acid-catalyzed condensation(SACC)

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Methane Emission from Rice Fields:Necessity for Molecular Approach for Mitigation

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Rice science 2024年第2期31卷 159-178页

作者： Sujeevan RAJENDRAN Hyeonseo park Jiyoung KIM Soon Ju park Dongjin SHIN Jong-Hee LEE Young hun SONG Nam-Chon PAEK Chul Min KIM Department of Horticulture Industry Wonkwang UniversityIksan 54538Korea Plant Molecular Biology and Biotechnology Research Center Gyeongsang National UniversityJinju 52828Korea Department of Southern Area Crop Science National Institute of Crop ScienceMiryang 50424Korea Department of Agricultural Biotechnology Seoul National UniversitySeoul 08826Korea Department of Plant Science Plant Genomics and Breeding InstituteResearch Institute of Agriculture and Life SciencesSeoul National UniversitySeoul 08826Korea

Anthropogenic methane emissions are a leading cause of the increase in global averagetemperatures,often referred to as global *** soils play a significant role in methaneproduction,where the anaerobic conditions promote the production of methane by *** fields contribute a considerable portion of agricultural methane emissions,as riceplants provide both factors that enhance and limit methane *** plants harbor both methaneproducingand methane-oxidizing *** from rice roots provide source for methaneproduction,while oxygen delivered from the root aerenchyma enhances methane *** haveshown that the diversity of these microorganisms depends on rice cultivars with some genes characterizedas harboring specific groups of microorganisms related to methane ***,there is still aneed for research to determine the balance between methane production and oxidation,as rice plantspossess the ability to regulate net methane *** agronomical practices,such as fertilizerand water management,have been employed to mitigate methane ***,studiescorrelating agronomic and chemical management of methane with productivity are ***,evidences for breeding low-methane-emitting rice varieties are scattered largely due to the absence ofcoordinated breeding *** has indicated that phenotypic characteristics,such as rootbiomass,shoot architecture,and aerenchyma,are highly correlated with methane *** reviewdiscusses available studies that involve the correlation between plant characteristics and *** emphasizes the necessity and importance of breeding low-methane-emitting rice varieties inaddition to existing agronomic,biological,and chemical *** review also delves into the idealphenotypic and physiological characteristics of low-methane-emitting rice and potential breeding techniques,drawing from studies conducted

关键词： methane emission rice breeding aerenchyma greenhouse gas radial oxygen loss

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Integrated guidance and control for damping augmented system via convex optimization

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Chinese Journal of Aeronautics 2022年第7期35卷 30-39页

作者： Bong-Gyun park Tae-hun KIM The 1^(st)R&D Institute-4 Agency for Defense DevelopmentDaejeon 34186Republic of Korea

In this paper,an integrated guidance and control approach is presented to improve the performance of the missile *** approach includes damping augmented system with attitude rate feedback to decrease the oscillation during the homing phase for missiles with low *** addition,physical constraints,which can affect the performance of the missile interception,such as acceleration limit,seeker’s look angle,and look angle rate constraints are *** integrated guidance and control problem is formulated as a convex quadratic optimization problem with equality and inequality constraints,and the solution is obtained by a primal–dual interior point *** performance of the proposed method is verified through several numerical examples.

关键词： Convex optimization Damping augmented system Integrated guidance and control Physical constraint Primal-dual interior point method

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Multidimensional Hybrid Architecture Encapsulating Cobalt Oxide Nanoparticles into Carbon Nanotube Branched Nitrogen-Doped Reduced Graphene Oxide Networks for Lithium–Sulfur Batteries

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Energy & Environmental Materials 2022年第2期5卷 555-564页

作者： Jeong Seok Yeon Young hun Ko Tae Ho park Hyunyoung park Jongsoon Kim Ho Seok park School of Chemical Engineering College of EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Korea Advanced Batteries Research Center Korea Electronics Technology Institute25Saenari-roBundang-guSeongnam-si Gyeonggi-do 13509Korea Department of Energy Science Sungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

Lithium–sulfur batteries(LSBs)are regarded as promising candidates for the next-generation energy storage devices owing to their high-theoretical capacity(1675 mAh g^(−1))and affordable ***,several limitations of LSBs such as the lithium polysulfide shuttle,large volume expansion,and low electrical conductivity of sulfur need to be resolved for practical *** address these limitations,herein,a multidimensional architectured hybrid(Co@CNT/nG),where Co_(3)O_(4) nanoparticles are encapsulated into threedimensional(3D)porous N-doped reduced graphene oxide interconnected with carbon nanotube(CNT)branches,is synthesized through a simple pyrolysis *** synergistic effect achieved through the homogeneously distributed and encapsulated Co_(3)O_(4) nanoparticles,the interconnected CNT branches,and the 3D hierarchical porous structure and N-doping of Co@CNT/nG significantly suppresses the shuttle effect of lithium polysulfides and enhances the conversion redox kinetics for the improved sulfur *** validate this effect through various measurements including symmetric cells,Li_(2)S nucleation,shuttle currents,Tafel slopes,diffusion coefficients,and post-mortem ***,Co@CNT/nG-70S-based LSB cells achieve a high-specific capacity of 1193.1 mAh g^(−1) at 0.1 C and a low capacity decay rate of 0.030%per cycle for 700 cycles at 5 C,delivering a high areal capacity of 5.62 mAh cm^(−2) even with a loading of 6.5 mg cm^(−2).

关键词： graphene/CNT hybrid lithium-sulfur batteries multidimensional architecture nanoparticle encapsulation redox promoter

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Understanding secondary phase inclusion and composition variations in the microstructure design of n-type Bi_(2)Te_(3) alloys via selective dissolution of KCl

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Journal of Advanced Ceramics 2023年第12期12卷 2360-2370页

作者： gwang Min park Seunghyeok Lee Jun-Yun Kang Seung-Hyub Baek Heesuk Kim Jin-Sang Kim Seong Keun Kim KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea Electronic Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Materials Science and Chemical Engineering Hanyang UniversityAnsan 15588Republic of Korea Ferrous Alloy Department Korea Institute of Materials ScienceChangwon 51508Republic of Korea Soft Hybrid Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju 55324Republic of Korea

This study investigated the effects of KCl treatment on microstructure and thermoelectric properties of n-type Bi_(2)Te_(2.7)Se_(0.3)(BTS)thermoelectric *** innovative KCl treatment was originally intended to introduce nanopores through selective dissolution of KCl from a mixture of thermoelectric materials and ***,it unexpectedly induced substantial variations in material composition and microstructure during the subsequent spark plasma sintering(SPS)*** groups adsorbed on the powder surface during the dissolution resulted in the emergence of a Bi_(2)TeO_(5) secondary phase within the BTS matrix after the SPS process at 450℃.The concentration of Bi_(2)TeO_(5) increased with an increase in the KCl ***,a remarkable grain growth occurred at low KCl concentrations,likely due to the liquid-phase formation in a Te-rich composition during ***,excessive Bi_(2)TeO_(5) at higher KCl concentrations hindered grain *** variations in the microstructure had complex effects on electrical properties:The TeBi antisite defects increased the electron concentration,and Bi_(2)TeO_(5) reduced electron ***,the lattice thermal conductivity decreased due to the presence of Bi_(2)TeO_(5),from 0.8 W·m^(−1)·K^(−1) at 298 K for the pristine BTS to 0.6 W·m^(−1)·K^(−1) at 298 K for BTS treated with 1 wt%*** insights allowed precise adjustments of the electrical and thermal conductivities,leading to an enhancement in the maximum value of figure-of-merit(ZT)from 0.76 to 0.96 through the selective dissolution of KCl *** believe that our observations potentially enable advances in thermoelectric materials by engineering microstructures.

关键词： thermoelectric materials Bi_(2)Te_(3) Bi_(2)TeO_(5) grain growth n-type KCl

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Improvement in tensile strength of extruded Mg-5Bi alloy through addition of Sn and its underlying strengthening mechanisms

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Journal of Magnesium and Alloys 2022年第11期10卷 3100-3112页

作者： Sang-Cheol Jin Jae Won Cha Jeong hun Lee Taekyung Lee Sang-Ho Han Sung Hyuk park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Ulsan Regional Division Korea Institute of Industrial TechnologyUlsan 44413Republic of Korea School of Mechanical Engineering Pusan National UniversityBusan 46241Republic of Korea Department of Materials Analysis Korea Institute of Materials ScienceChangwon 51508Republic of Korea

Through an investigation of the microstructure and mechanical properties of extruded Mg–5Bi–x Sn(BT5x, x = 0, 2, 4, and 6 wt%) alloys,this study demonstrates that the addition of Sn to an Mg–5Bi binary alloy significantly improves the tensile strength of the extruded *** the extruded alloys exhibit a typical basal fiber texture and a partially dynamically recrystallized(DRXed) microstructure consisting of fine DRXed grains and coarse un DRXed grains. As the Sn content increases from 0 wt% to 6 wt%, the average size of the DRXed grains decreases from 4.2 to 2.8 μm owing to the increase in the amount of precipitates via their grain-boundary pinning effect. The extruded B5 and BT52 alloys contain numerous Mg_(3)Bi_(2) precipitates, but their size and number density are smaller and higher, respectively, in the latter *** Mg_(2)Sn precipitates as well as Mg_(3)Bi_(2)precipitates are present in the extruded BT54 and BT56 alloys, and the number density of the Mg_(2)Sn precipitates is higher in the latter alloy because of its higher Sn content. The addition of 2 wt% Sn to the B5 alloy significantly improves the yield strength(YS) and ultimate tensile strength(UTS) of the extruded alloy—by 76 and 57 MPa, respectively. This drastic improvement is the combined outcome of enhanced grain-boundary hardening, precipitation hardening, and solid-solution hardening effects induced by the refined DRXed grains, numerous precipitates, and Sn solute atoms, respectively. The further addition of 2 wt% or 4 wt% Sn to the BT52 alloy leads to moderate increments in the YS and UTS of the extruded alloy. Specifically, each addition of 2 wt% Sn increases the YS and UTS by ~26 and ~20 MPa, respectively, which is attributed mainly to the additional precipitation hardening effect induced by the Mg_(2)Sn precipitates.

关键词： Mg-Bi-Sn alloy Extrusion Precipitation Microstructure Tensile property

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Risk of ischaemic stroke in patients with transient global amnesia: a propensity-matched cohort study

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Stroke & Vascular Neurology 2022年第2期7卷 101-107页

作者： Sang hun Lee Keon-Yeup Kim Jeong-Woo Lee So-Jeong park Jin-Man Jung Department of Neurology Korea University Ansan HospitalKorea University College of MedicineAnsanRepublic of Korea Data Science Team Hanmi Pharm.Co.LtdSeoulRepublic of Korea Korea University Zebrafish Translational Medical Research Center AnsanRepublic of Korea

Background The exact pathophysiological mechanism of transient global amnesia(TGA)is *** is debatable whether TGA is a risk factor for ***,here we investigated the possibility of TGA as a risk factor for stroke in a real-world setting using large-scale nationwide health claims *** We used health claims data from the Korean National Health Insurance Service(NHIS).Patients diagnosed with TGA between 2007 and 2013 were *** initially extracted patients without TGA who were preferentially matched for age and sex with the patients with TGA at a ratio of 10:1 from the whole ***,we performed 1:2 propensity score matching analysis to balance the baseline characteristics between the two *** the propensity score-matched dataset,we performed multivariable Cox regression analysis to investigate the association between TGA and stroke type,including ischaemic,haemorrhagic and all stroke *** Patients with TGA(n=14673)were selected from the NHIS *** extracting from the whole database(n=140486)and propensity score matching their data at a 1:2 ratio,a total of 10448 and 20442 patients were finally assigned to the TGA and control groups,*** multivariable Cox regression analysis demonstrated that the TGA group had a higher risk of ischaemic stroke and all types of stroke(adjusted HR=1.194;95%CI:1.043 to 1.368;and HR=1.197;95%CI:1.056 to 1.357,respectively).Conclusions Analysis of the nationwide claims database showed that TGA could be an important risk factor for stroke,especially for ischaemic stroke.

关键词： patients matched transient

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Ruptured splenic artery aneurysms in pregnancy and usefulness of endovascular treatment in selective patients:A case report and review of literature

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World Journal of Clinical Cases 2022年第25期10卷 9057-9063页

作者： Sang hun Lee Songsoo Yang Inkyu park Yeong Cheol Im Gyu Yeol Kim Department of Obstetrics and Gynecology Ulsan University and Ulsan University HospitalUlsan 44033South Korea Department of Surgery Ulsan University and Ulsan University HospitalUlsan 44033South Korea

BACKGROUND The rupture of a splenic artery aneurysm(SAA)in pregnancy is an uncommon ***,it is associated with high mortality rates in pregnant women and fetuses even after surgical *** the endovascular treatment of SAAs is currently preferred as it can improve the outcomes even in emergent cases,the endovascular treatment of a ruptured SAA during pregnancy has not been reported until *** SUMMARY We report a case of a 33-year-old woman with the sudden onset of epigastric pain due to a ruptured SAA at the mid-portion of the splenic artery at 18 wk of *** emergent initial resuscitation,the patient was diagnosed with a ruptured SAA through digital *** upon diagnosis,she underwent emergent endovascular embolization of the splenic artery for the rupture on the ***,surgery was performed to remove the hematoma under stable *** the fetus was found to be dead during resuscitation,the woman recovered without complications and was discharged 15 d *** Endovascular treatment might be a valuable alternative to surgery/lead to safer surgery for selected pregnant patients with ruptured SAAs.

关键词： Splenic artery Aneurysm Pregnancy Endovascular treatment Case report

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Seismic hazard level reduction for existing buildings considering remaining building lifespans

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Earthquake Engineering and Engineering Vibration 2019年第3期18卷 649-661页

作者： Ji-hun park Division of Architecture and Urban Design Incheon National University

Seismic hazard levels lower than those for design of new buildings have been permitted for seismic evaluation and retrofi t of existing buildings due to the relatively short remaining lifespans. The seismic hazard reduction enables costeff ective seismic evaluation and retrofi t of existing buildings with limited structural capacity. The current study proposes seismic hazard reduction factors for Korea, one of low to moderate seismicity regions. The seismic hazard reduction factors are based on equal probabilities of non-exceedance within diff erent remaining building lifespans. A validation procedure is proposed to investigate equality of seismic risk in terms of ductility-based limit states using seismic fragility assessment of nonlinear SDOF systems, of which retrofi t demands are determined by the displacement coeffi cient method of ASCE 41-13 for diff erent target remaining building lifespans and corresponding reduced design earthquakes. Validation result shows that the use of seismic hazard reduction factors can be permitted in conjunction with appropriate lower bounds of the remaining building lifespans.

关键词： seismic hazard level existing building remaining building lifespan probability of limit state

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