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Oxygen vacancy engineering for tuning the catalytic activity of LaCoO_(3) perovskite

Journal of Rare Earths 2024年第3期42卷 506-514,I0003页

作者： Jeong Hyun Cho Minjae Kim Inchan Yang Kyung tae Park Chang Houn Rhee Hai Woong Park Ji Chul jung Department of Chemical Engineering Myongji UniversityYongin 17058Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and TechnologyWanju-gunJeollabuk-do 55324Republic of Korea Iron&Steel Process Engineering Research Group POSCOPohang 37859Republic of Korea Hydrogen Research Center Research Institute of Industrial Science&Technology(RIST)Pohang 37673Republic of Korea

Herein, we attempted to engineer oxygen vacancies on the surface of LaCoO_(3) perovskite through simple post-treatments(acid or reductive thermal treatments). Acid treatment induces oxygen vacancies through the selective etching of the La cations, whereas thermal treatment in a reducing atmosphere generates oxygen vacancies by directly removing lattice oxygen. The characterization results confirm that the number of surface oxygen vacancies, which are crucial in various catalytic oxidation reactions,considerably increases in the LaCoO_(3) catalysts treated with acid or reducing gas. Acid treatment enriches the oxygen vacancies while maintaining the structure of the LaCoO_(3) catalysts, which can not be achieved through reductive thermal treatment. Therefore, the acid treatment is considered a promising technique for oxygen vacancy engineering of perovskite catalysts for tuning their catalytic activities. Furthermore,the catalytic activities of the posttreated LaCoO_(3) catalysts for CO oxidation were evaluated and are noted to be considerably better than those of the pristine LaCoO_(3) catalyst due to their abundant oxygen vacancies. Consequently, we conclude that the oxygen vacancies of perovskite catalysts can be effectively engineered via two simple methods and play a significant role in CO oxidation.

关键词： LaCoO_(3)perovskite Acid treatment Reductive thermal treatment Oxygen vacancy CO oxidation Rare earths

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Effects of planting distance and depth on PTO load spectrum of a small riding-type transplanter

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International Journal of Agricultural and Biological Engineering 2020年第2期13卷 57-63页

作者： Wan-Soo Kim Yeon-Soo Kim taek-Jin Kim Kyu-Chul Nam tae-Bum Kim tae-Ho Han Ryu-Gap Im yong-Hyeon Kim yong-Joo Kim Department of Biosystems Machinery Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Department of Smart Agriculture Systems Chungnam National UniversityDaejeon 34134Republic of Korea Convergence Agricultural Machinery Group Korea Institute of Industrial TechnologyGimje 54325Republic of Korea Certification WarrantyInspection and Standardization TeamKorea Agricultural Machinery Industry CooperativeCheonan 31041Republic of Korea Diesel Service Korea Co.Ltd. Daejeon 34357Republic of Korea Agricultural Machinery Certification Team Foundation of Agricultural Technology Commercialization and TransferIksan 54667Republic of Korea Gint Co.Ltd. Suwon 16225Republic of Korea

The aim of this study was to analyze the effects of the planting distance and depth on the power take-off(PTO)load spectrum of a small riding-type transplanter for the optimal design of the *** measure load data during actual planting operation,a load measurement system was developed using a torque sensor,a data acquisition system,and an *** experiments were conducted at four planting distances(26 cm,35 cm,43 cm,and 80 cm)and three planting depths(85 mm,105 mm,and 136 mm)in a field with similar soil *** measured load data were inverted into a load spectrum using rain-flow counting and Smith-Watson-Topper(SWT)*** safety factor of a transplanter according to the planting conditions was analyzed using the converted load spectrum and commercial *** load spectrum for all planting conditions showed torque ratios similar within a high cycle region of 108 to *** torque ratio increased when the planting depth increased and planting distance decreased in the low cycle region under less than 108 *** safety factors of the PTO driving gear and the driven gear increased as the planting distance increased at all planting *** the planting depth decreased at the same planting distance,the safety factor of the PTO gears *** results of this study might provide useful information for a transplanter PTO design considering the working load according to the various planting conditions.

关键词： transplanter planting distance planting depth power take-off load spectrum safety factor

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Helicobacter pylori and interleukin-8 in gastric cancer

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World Journal of Gastroenterology 2013年第45期19卷 8192-8202页

作者： Ko Eun Lee Pham Ngoc Khoi yong Xia jung Sun Park Young Eun Joo Kyung Keun Kim Seok yong Choi Young Do jung Research Institute of Medical Sciences Chonnam National University Medical School Gwangju 501-190 South Korea

Helicobacter pylori(***)is a major etiological factor in the development of gastric ***-scale epidemiological studies have confirmed the strong association between *** infection and both cancer development and ***-8(IL-8)is overexpressed in gastric mucosa exposed to *** expression of IL-8 directly correlates with a poor prognosis in gastric ***-8 is *** addition to its potent chemotactic activity,it can induce proliferation and migration of cancer *** this review,we focus on recent insights into the mechanisms of IL-8 signaling associated with gastric *** relationship between IL-8 and *** is *** also summarize the current therapeutics against IL-8 in gastric cancer.

关键词： Helicobacter pylori Interleukin-8 Signals Gastric cancer Therapeutics

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V_(2)O_(3)/VN electrocatalysts with coherent heterogeneous interfaces for selecting low-energy nitrogen reduction pathways

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SusMat 2024年第4期4卷 90-103页

作者： tae-yong An Chengkai Xia Minyeong Je Hyunjung Lee Seulgi Ji Min-Cheol Kim Subramani Surendran Mi-Kyung Han Jaehyoung Lim Dong-Kyu Lee Joon Young Kim tae-Hoon Kim Heechae Choi jung Kyu Kim Uk Sim Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuRepublic of Korea School of Chemical Engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea Materials&Chemistry Group Institute of Inorganic ChemistryUniversity of CologneCologneGermany Department of Polymer Engineering Graduate SchoolAlan G.MacDiarmid Energy Research Institute&School of Polymer Science and EngineeringChonnam National UniversityGwangjuRepublic of Korea Research Institute NEEL SciencesJeollanamdoRepublic of Korea Department of Materials Science and Engineering Chonnam National UniversityGwangjuRepublic of Korea Department of Chemistry Xi’an Jiaotong-Liverpool UniversitySuzhouChina

Electrochemical nitrogen reduction reaction(NRR)is a sustainable alterna-tive to the Haber-Bosch process for ammonia(NH3)***,the significant uphill energy in the multistep NRR pathway is a bottleneck for favorable serial *** overcome this challenge,we designed a vanadium oxide/nitride(V_(2)O_(3)/VN)hybrid electrocatalyst in which V_(2)O_(3)and VN coex-ist coherently at the heterogeneous *** single-phase V_(2)O_(3)and VN exhibit different surface catalytic kinetics for NRR,the V_(2)O_(3)/VN hybrid elec-trocatalyst can provide alternating reaction pathways,selecting a lower energy pathway for each material in the serial NRR *** a result,the ammo-nia yield of the V_(2)O_(3)/VN hybrid electrocatalyst was 219.6µg h^(-1)cm^(-2),and the Faradaic efficiency was 18.9%,which is much higher than that of single-phase VN,V_(2)O_(3),and VNxOy solid solution catalysts without *** functional theory calculations confirmed that the composition of these hybrid electrocatalysts allows NRR to proceed from a multistep reduction reaction to a low-energy reaction pathway through the migration and adsorption of interme-diate ***,the design of metal oxide/nitride hybrids with coherent heterointerfaces provides a novel strategy for synthesizing highly efficient elec-trochemical catalysts that induce steps favorable for the efficient low-energy progression of NRR.

关键词： coherent heterogeneous interfaces green ammonia synthesis hybrid electrocatalyst low-energy progression nitrogen reduction reaction(NRR) vanadium oxide/nitride(V_(2)O_(3)/VN)

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Direct modification of spermatogonial stem cells using lentivirus vectors in vivo leads to efficient generation of transgenic rats

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Asian Journal of Andrology 2019年第2期21卷 190-195页

作者： Bang-Jin Kim yong-Hee Kim Myeong-Geun Oh Ki-jung Kim Sang-Eun jung Ju-Hee Jin Sun-Uk Kim Kwan-Sik Min Buom-yong Ryu Department of Animal Scienee and Technology College of Biotechnology and Natural ResourcesChung-Ang UniversityAnseongGyeonggi-do 17546Korea National Primate Research Center Korea Research Institute of Bioscienee and BiotechnologyCheongjuChungcheongbuk-do 28116Korea Futuristic Animal Resource and Research Center Korea Research Institute of Bioscience and BiotechnologyCheongjuChungcheongbuk-do 28116Korea Animal Biotechnology Graduate School of Future Con verge nee Tech no logyDepartment of Animal Life ScienceInstitute of Genetic Engi neeringHankyong National UniversityAnseongGyeon ggi-do 17579Korea Department of Cancer Biology University of PennsylvaniaPhiladelphiaPA 19104USA.

Spermatogonial stem cells(SSCs)transmit genetic information to the next progeny in ***,SSCs are a potential target for germ I i ne modifications to gen erate tran sgenic an *** this study,we report a technique for the gen erati on of tran sgenic rats by in vivo manipulation of SSCs with a high success *** in juvenile rats were transduced in vivo with high titers of lentivirus harbori ng enhan ced green fluoresce nt protei n and mated with wild-type females to create foun der *** founder rats expressed the transgene and passed on the transgene with an overall success rate of 50.0%.Subsequent generations of progeny from the founder rats both expressed and passed on the ***,direct modification of SSCs in juvenile rats is an effective means of generating transgenic rats through the male *** technology could be adapted to larger animals,in which existing methods for gene modificatio n are in adequate or in applicable,resulti ng in the gen eration of tran sge nic an imals in a variety of species.

关键词： germline modification lentivirus spermatogonial stem cell testis transgenic animal

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Usefulness of CA 19–9 for pancreatic cancer screening in patients with new-onset diabetes

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Hepatobiliary & Pancreatic Diseases International 2018年第3期17卷 263-268页

作者： jung Wan Choe Hyo jung Kim Jae Seon Kim Jaehyung Cha Moon Kyung Joo Beom Jae Lee Jong-Jae Park Young-tae Bak Department of Internal Medicine Korea University College of MedicineSeoul 08308Korea Department of Biostatistics Korea University Medical CenterSeoul 08308Korea

Background： Generally, carbohydrate antigen 19–9 （CA 19–9） is not useful for screening pancreatic cancerin the asymptomatic general population. This study aimed to evaluate the utility of CA 19–9 level as a scre... 详细信息

关键词： Diabetes mellitus Pancreatic neoplasms Early detection of cancer Carbohydrate antigen 19-9 Bilirubin

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Inferring community properties of benthic macroinvertebrates in streams using Shannon index and exergy

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Frontiers of Earth Science 2014年第1期8卷 44-57页

作者： Tuyen Van NGUYEN Woon-Seok CHO Hungsoo KIM Il Hyo jung yongKuk KIM tae-Soo CHON Department of Mathematics Pusan National University Busan 609-735 Korea Department of Biological Sciences Pusan National University Busan 609-735 Korea DSPENALO National Robotics Research Center Pusan National University Busan 609-735 Korea Department of Mathematics Kyungpook National University Daegu 702-701 Korea

Definition of ecological integrity based on community analysis has long been a critical issue in risk assessment for sustainable ecosystem management. In this work, two indices （i.e., Shannon index and exergy） were selected for the analysis of community properties of benthic macroinvertebrate community in streams in Korea. For this purpose, the means and variances of both indices were analyzed. The results found an extra scope of structural and functional properties in communities in response to environmental variabilities and anthropogenic disturbances. The combination of these two parameters （four indices） was feasible in identification of disturbance agents （e.g., industrial pollution or organic pollution） and specifying states of communities. The four-aforemen- tioned parameters （means and variances of Shannon index and exergy） were further used as input data in a self- organizing map for the characterization of water quality. Our results suggested that Shannon index and exergy in combination could be utilized as a suitable reference system and would be an efficient tool for assessment of the health of aquatic ecosystems exposed to environmental disturbances.

关键词： benthic macroinvertebrates ecological integ-rity anthropogenic pollution self-organizing map

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Effects of traditional Chinese herbal medicine San-HuangXie-Xin-Tang on gastrointestinal motility in mice

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World Journal of Gastroenterology 2015年第4期21卷 1117-1124页

作者： Min Woo Hwang tae Seok Ahn Noo Ri Hong Han-Sol Jeong Myeong Ho jung Ki-tae Ha Byung Joo Kim Department of Sasang Constitutional Medicine College of Korean MedicineKyung Hee UniversitySeoul 130-701South Korea School of Korean Medicine Pusan National UniversityYangsan 626-870South Korea

AIM: To investigate the effects of San-Huang-Xie-XinTang(SHXXT), a herbal product used in traditional Chinese medicine, on gastrointestinal(GI) motility in ***: The in vivo effects of SHXXT on GI motility were investigated by measuring the intestinal transit rates(ITRs) using Evans blue in normal mice and in mice with experimentally induced GI motility dysfunction(GMD).RESULTS: In normal ICR mice, ITRs were significantly and dose-dependently increased by SHXXT(0.1-1 g/kg). GMD was induced by injecting acetic acid or streptozotocin intraperitoneally. The ITRs of GMD mice were significantly reduced compared to normal mice, and these reductions were significantly and dose-dependently inhibited by SHXXT(0.1-1 g/kg).CONCLUSION: These results suggest that SHXXT is a novel candidate for the development of a prokinetic agent that may prevent or alleviate GMD.

关键词： Gastrointestinal disorders San-Huang-XieXin-Tang M

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Role of transcription factor acetylation n the regulation of metabolic homeostasis

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Protein & Cell 2015年第11期6卷 804-813页

作者： Joo-Man Park Seong-Ho Jo Mi-Young Kim tae-Hyun Kim yong-Ho Ahn Department of Biochemistry and Molecular Biology Yonsei University College of Medicine 50-1 Yonsei-ro Seodaemun-gu Seoul 120-752 Republic of Korea Brain Korea 21 PLUS Project for Medical Sciences Yonsei University College of Medicine 50-1 Yonsei-ro Seodaemun-gu Seoul 120-752 Republic of Korea

Post-translational modifications （PTMs） of transcription factors play a crucial role in regulating metabolic homeostasis. These modifications include phosphory- lation, methylation, acetylation, ubiqulUnation, SUMOy- lation, and O-GIcNAcylation. Recent studies have shed light on the importance of lysine acetylation at nonhis- tone proteins including transcription factors. Acetyla- tion of transcription factors affects subcellular distribution, DNA affinity, stability, transcriptional activity, and current investigations are aiming to further expand our understanding of the role of lysine acetyla- tion of transcription factors. In this review, we summarize recent studies that provide new insights into the role of protein lysine-acetylation in the transcriptional regulation of metabolic homeostasis.

关键词： metabolic homeostasis transcriptionfactor post-translational modification type 2 diabetesmellitus

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Diffusion with a Discontinuous Potential:a Non-Linear Semigroup Approach

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Analysis in Theory and Applications 2021年第2期37卷 178-190页

作者： yong-jung Kim Marshall Slemrod Department of Mathematical Sciences KAIST291 Daehak-roYuseong-guDaejeon 305-701Korea Department of Mathematics University of WisconsinMadison WI 53706USA

This paper studies existence of mild solution to a sharp cut off model for contact driven tumor *** is based on application of the Crandall-Liggett theorem for w-quas-contractive semigroups on the Banach space L^(1)(Ω).Furthermore,numerical computations are provided which compare the sharp cut off model with the tumor growth model of Perthame,Quiros,and Vazquez[13].

关键词： Nonlinear semigroups tumor grow th models Hele Shaw diffusion

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