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In situ synthesis of chemically bonded NaTi2（PO4）3/rGO 2D nanocomposite for high-rate sodium-ion batteries

Nano Research 2016年第6期9卷 1844-1855页

作者： Ha-kyung Roh hyun-kyung kim Myeong-Seong kim Dong-hyun kim kyung Yoon Chung Kwang Chul Roh Kwang-Bum kim Department of Material Science & Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seou103722 Republic of Korea Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB30FS UK Center for Energy Convergence Korea Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seou102792 Republic of Korea Energy & Environmental Division Korea Institute of Ceramic Engineering & Technology 101 Soho-ro Jinju-si Gyeongsangnam-do 52851 Republic of Korea

A phase-pure NaTi2（PO4）3/reduced graphene oxide （rGO） nanocomposite was prepared using a microwave-assisted one-pot method and subsequent heat treatment. The well-crystallized NaTi2（PO4）3 nanoparticles （30-40 nm） were uniformly precipitated on rGO templates through Ti-O-C bonds. The chemical interactions between the NaTi2（PO4）3 nanoparticles and rGO could immobilize the NaTi2（PO4）3 nanoparticles on the rGO sheets, which might be responsible for the excellent electrochemical performance of the nanocomposite. The NaTi2（PO4）B/rGO nanocomposite exhibited a specific capacity of 128.6 mA-h.g-1 approaching the theoretical value at a 0.1 C-rate with an excellent rate capability （72.9% capacity retention at 50 C-rate） and cycling performance （only 4.5% capacity loss after 1,000 cycles at a high rate of 10 C）. These properties were maintained even when the electrodes were prepared without the use of an additional conducting agent. The excellent sodium storage properties of the NaTi2（PO4）B/rGO nanocomposite could be attributed to the nano-sized NaTi2（PO4）3 particles, which significantly reduced the transport lengths for Na＋ ions, and an intimate contact between the NaTi2（PO4）3 particles and rGO due to chemical bonding.

关键词： NaTi2(PO4)dreducedgraphene oxide (rGO)nanocomposite chemical bonding energy-efficiency in situ synthesis high-rate sodium-ion batteries

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Aging Behavior of Mg-Y-Zr and Mg-Nd-Zr Cast Alloys

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Journal of Materials Science & Technology 2008年第1期24卷 80-84页

作者： Yang-Do kim Nam-hyun Kang Il-Guk Jo kyung-hyun kim In-Bae kim School of Materials Science and Engineering Pusan National University 30 Jangjun-dongGeumjeong-guBusan 609-735Korea Deptartment of Materials Engineering Korea Institute of Machinery & Materials 66 Sangnam-dongChangwonGyeongsangnam-do 641-010Korea

Aging behavior of Mg-3.6Y-0.5Zr and ***-0.5Zr alloys was investigated by microhardness measurement and transmission electron *** the case of Mg-Y-Zr alloy,the presence ofβ″phase,a major strength- ener,having base centered orthorhombic structure with its lattice constants of a-（β″）=0.64 nm,b-（β″）=2.22 nm, and c-（β″）=0.52 nm was *** the case of Mg-Nd-Zr alloy aged at 250℃,the presence ofβ″andβ′phases was *** crystal structure ofβ″phase was found to be DO-（19） and its orientation relationships with Mg matrix were [0001]-（β″）//[0001]-（Mg） and [01（？）0]-（β″）//[01（？）0]-（Mg）.Theβ′phase had face centered cubic structure and its orientation relationships with Mg matrix were [011]-（β′）//[0001]-（Mg） and [（？）1（？）]β′//[（？）110]）-（Mg）. The ***-0.5Zr alloy showed higher hardness compared with Mg-3.6Y-0.5Zr alloy.

关键词： Mg-Y-Zr alloy Mg-Nd-Zr alloy Precipitation sequence

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Small RNA- and DNA-based gene therapy for the treatment of liver cirrhosis, where we are?

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World Journal of Gastroenterology 2014年第40期20卷 14696-14705页

作者： kyung-hyun kim Kwan-Kyu Park Department of Pathology College of Medicine Catholic University of Daegu Daegu 705-718 South Korea

Chronic liver diseases with different aetiologies rely on the chronic activation of liver injuries which result in a fibrogenesis progression to the end stage of cirrhosis and liver *** on the underlying cellular and molecular mechanisms of a liver fibrosis,there has been proposed several kinds of approaches for the treatment of liver ***,liver gene therapy has been developed as an alternative way to liver transplantation,which is the only effective therapy for chronic liver *** activation of hepatic stellate cells,a subsequent release of inflammatory cytokines and an accumulation of extracellular matrix during the liver fibrogenesis are the major obstacles to the treatment of liver *** targeted strategies have been developed,such as antisense oligodeoxynucleotides,RNA interference and decoy oligodeoxynucleotides to overcome this *** this report an overview will be provided of targeted strategies for the treatment of liver cirrhosis,and particularly,of the targeted gene therapy using short RNA and DNA segments.

关键词： Liver cirrhosis Gene therapy Oligodeoxynucleotides Antisense Small interfering RNA Micro RNA Decoy

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Treatment of intractable orbital implant exposure with a large conjunctival defect by secondary insertion of the implant after preceding dermis fat graft

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International Journal of Ophthalmology(English edition) 2013年第2期6卷 193-197页

作者： hyun kyung kim Tae Yoon La Department of Ophthalmology St. Vincent's Hospital College of Medicine The Catholic University of Korea

AIM: To report a procedure and results of a two-stage operation to manage intractable extensive orbital implant exposure with a large conjunctival defect which was difficult to treat with dermis fat grafts due to repeated graft necrosis. METHODS: A retrospective chart review of four patients who had extensive orbital implant exposures with large conjunctival defects and had past histories of repeated autologous or preserved dermis graft failures was done. As a first-stage operation, the problematic pre-existing orbital implants were removed and autologous dermis fat grafts alone were performed on the defect area. Four months later, new orbital implants were secondarily inserted after confirmation of graft survival. The size of the conjunctival defects and state of the extraocular muscles were checked preoperatively. Success of the operations and complications were ***: The mean size of the conjuctival defects was 17.3mm×16.0mm, and the mean time from the initial diagnosis of orbital implant exposure to implant removal and autologous dermis fat graft was 20.8 months. After implant removal and autologous dermis fat graft, no graft necrosis was observed in any patients. Also, implant exposure or fornix shortening was not observed in any patients after new orbital implant insertion. CONCLUSION: The secondary insertion of a new orbital implant after pre-existing implant removal and preceding dermis fat graft is thought to be an another selective management of intractable orbital implant exposure in which dermis fat grafts persistently fail.

关键词： conjunctival defect dermis fat graft orbital implant exposure

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Metabolic relationships between marine red algae and algae‑associated bacteria

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Marine Life Science & Technology 2024年第2期6卷 298-314页

作者： kyung hyun kim Jeong Min kim Ju Hye Baek Sang Eun Jeong Hocheol kim Hwan Su Yoon Che Ok Jeon Department of Biological Sciences and Biotechnology Hannam UniversityDaejon 34054Republic of Korea Department of Life Science Chung-Ang UniversitySeoul 06974Republic of Korea Department of Biological Sciences Sungkyunkwan UniversitySuwon 16419Republic of Korea

Mutualistic interactions between marine phototrophs and associated bacteria are an important strategy for their success-ful survival in the ocean,but little is known about their metabolic ***,bacterial communities in the algal sphere(AS)and bulk solution(BS)of nine marine red algal cultures were analyzed,and Roseibium and Phycisphaera were identified significantly more abundantly in AS than in *** metabolic features of Roseibium RMAR6-6(isolated and genome-sequenced),Phycisphaera MAG 12(obtained by metagenomic sequencing),and a marine red alga,Porphyridium purpureum CCMP1328(from GenBank),were analyzed ***6-6 has the genetic capability to fix nitrogen and produce B vitamins(B1,B2,B5,B6,B9,and B12),bacterioferritin,dimethylsulfoniopropionate(DMSP),and phenylacetate that may enhance algal growth,whereas MAG 12 may have a limited metabolic capability,not producing vitamins B9 and B12,DMSP,phenylacetate,and siderophores,but with the ability to produce bacitracin,possibly modulating algal *** CCMP1328 lacks the genetic capability to fix nitrogen and produce vitamin B12,DMSP,phenylacetate,and *** was shown that the nitrogen-fixing ability of RMAR6-6 promoted the growth of ***-pureum,and DMSP reduced the oxidative stress of *** metabolic interactions between strain RMAR6-6 and *** CCMP1328 were also investigated by the transcriptomic analyses of their monoculture and *** together,potential metabolic relationships between Roseibium and *** were *** study provides a bet-ter understanding of the metabolic relationships between marine algae and algae-associated bacteria for successful growth.

关键词： Metabolic relationship Marine red algae Symbiotic bacteria Roseibium Phycisphaera Porphyridium

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Mechanisms of fibrogenesis in liver cirrhosis:The molecular aspects of epithelial-mesenchymal transition

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World Journal of Hepatology 2014年第4期6卷 207-216页

作者： Sun-Jae Lee kyung-hyun kim Kwan-Kyu Park Department of Pathology Catholic University of DaeguCollege of Medicine

Liver injuries are repaired by fibrosis and *** cause of fibrosis and diminished regeneration,especially in liver cirrhosis,is still *** transition(EMT) has been found to be associated with liver *** possibility that EMT could contribute to hepatic fibrogenesis reinforced the concept that activated hepatic stellate cells are not the only key players in the hepatic fibrogenic process and that other cell types,either hepatic or bone marrow-derived cells could contribute to this *** an initial enthusiasm for the discovery of this novel pathway in fibrogenesis,more recent research has started to cast serious doubts upon the real relevance of this phenomenon in human fibrogenetic *** debate on the authenticity of EMT or on its contribution to the fibrogenic process has become very *** overall result is a general confusion on the meaning and on the definition of several key *** aim of this article is to describe how EMT participates to hepatic fibrosis and discuss the evidence of supporting this possibility in order to reach reasonable and useful conclusions.

关键词： Epithelial-mesenchymal transition Liver Fibrosis Transforming growth factor-beta1 Biological markers

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The Level of Expression of Thioredoxin is Linked to Fundamental Properties and Applications of Wheat Seeds

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Molecular Plant 2009年第3期2卷 430-441页

作者： Yong-Chun Li Jiang-Ping Ren Myeong-Je Cho Su-Mei Zhou Yong-Bum kim Hong-Xiang Guo Joshua H. Wong Hong-Bin Niu hyun-kyung kim Susumu Morigasaki Peggy G. Lemaux Oscar L. Frick Jun Yin Bob B. Buchanan National Engineering Research Centre for Wheat Henan Agricultural University Zhengzhou 450002 China Department of Plant and Microbial Biology 111 Koshland Hall University of California Berkeley CA 94720 USA Department of Pediatrics School of Medicine University of California San Francisco CA 94143 USA

Work with cereals （barley and wheat） and a legume （Medicago truncatula） has established thioredoxin h （Trx h） as a central regulatory protein of seeds. Trx h acts by reducing disulfide （S-S） groups of diverse seed proteins （storage proteins, enzymes, and enzyme inhibitors）, thereby facilitating germination. Early in vitro protein studies were complemented with experiments in which barley seeds with Trx h overexpressed in the endosperm showed accelerated germination and early or enhanced expression of associated enzymes （α-amylase and pullulanase）. The current study extends the transgenic work to wheat. Two approaches were followed to alter the expression of Trx h genes in the endosperm：（1） a hordein promoter and its protein body targeting sequence led to overexpression of Trx hS, and （2） an antisense construct of Trx h9 resulted in cytosolic underexpression of that gene （Arabidopsis designation）. Underexpression of Trx h9 led to effects opposite to those observed for overexpression Trx h5 in barley--retardation of germination and delayed or reduced expression of associated enzymes. Similar enzyme changes were observed in developing seeds. The wheat lines with underexpressed Trx showed delayed preharvest sprouting when grown in the greenhouse or field without a decrease in final yield. Wheat with overexpressed Trx h5 showed changes commensurate with earlier in vitro work： increased solubility of disulfide proteins and lower aUergenicity of the gliadin fraction. The results are further evidence that the level of Trx h in cereal endosperm determines fundamental properties as well as potential applications of the seed.

关键词： metabolic regulation molecular physiology seed biology preharvest sprouting seed germination thioredoxin h wheat allergenicity.

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Grain size dependence of flow stress in ECAPed Ti with constant texture

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中国有色金属学会会刊：英文版 2012年第S3期22卷 673-677页

作者： Chang-Young hyun Ho-kyung kim Department of Materials Science and Engineering Seoul National University of Science and Technology Department of Automotive Engineering Seoul National University of Science and Technology

The effect of grain size on the flow stress in an ECAPed Ti with a constant texture was investigated,assuming that 2,4,5 and 6 passes microstructures have a similar *** average size of recrystallized grains decreased to 0.5 μm,0.4 μm,and 0.3 μm with respect to the ECAP pass number of 2,4,and 6,*** ultimate tensile strength (UTS) and yield strength (YS) increase with an increase in the number of *** UTS and YS of the 6 passes ECAPed sample were found to be 740.2 MPa and 580.3 MPa,*** equation for the flow stress of an ECAPed Ti with a constant texture as a function of the strain and grain size was derived for the ECAPed *** following equation was finally obtained:σ(ε)=103.9+1825ε-9.6ε1/2·d-1/2+8.3d-1/2.

关键词： Ti mechanical properties grain size flow stress equal channel angular pressing

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Extrusion process of Acanthopanax senticosus leaves enhances the gastroprotective effect of compound 48/80 on acute gastric mucosal lesion in rats

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Journal of Traditional Chinese Medicine 2016年第2期36卷 187-196页

作者： Hye kyung kim Myung-Gyou kim Kang-hyun Leem Department of Food & Biotechnology Hanseo University College of Korean Medicine Semyung University

OBJECTIVE:To investigate the gastroprotective effects of Acanthopanax senticosus leaves(ASLs)extrusion on acute gastric mucosal lesion in rats induced by compound 48/80(C48/80).METHODS:Rats were divided into six groups:normal;C48/80-induced gastric lesion control;gastric lesion positive control(famotidine 4 mg/kg);gastric lesion administered with two levels of extruded ASLs(ASLE,40 and 200 mg/kg);and gastric lesion treated with ASLs(ASL 200 mg/kg).Mucus secretion/damage was determined by immunohistological *** and western blotting were performed to determine gastric mucosal Bax and Bcl-2 *** mucosal oxidative-stress-related enzymes and malondialdehyde were ***:C48/80-induced mucus depletion and inflammation in the gastric mucosa were significantly attenuated by *** increased serum serotonin and histamine concentrations in C48/80-treated rats were also attenuated by *** mucosal Bax protein expression was increased and Bcl-2 expression was decreased after C48/80 treatment,and ASLs ameliorated Bax and Bcl-2 *** extrusion process significantly augmented the effects of ASLs in a dosedependent *** at 200 mg/kg normalized mucus damage/secretion,C48/80-induced increases of mucosal myeloperoxidase activity(index of inflammation),xanthine oxidase,and malondialdehyde content(index of lipid peroxidation).The effects of ASLs on Bax and Bcl-2expression were also enhanced by ***,these effects of ASLEs at 200 mg/kg were similar to those of famotidine,a histamine H2-receptor antagonist commonly used to treat gastric ***:ASLEs prevented acute gastric mucosal lesion progression induced by C48/80,possibly by inducing mucus production,and reduced inflammation and oxidative stress in gastric mucosa through an anti-apoptotic mechanism.

关键词： Acanthopanax senticosus leaves Extrusion Compound 48/80 Gastric mucosal lesion

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Relationship between early structural changes at cornea incision sites and surgical outcomes after phacoemulsification

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International Journal of Ophthalmology(English edition) 2019年第7期12卷 1139-1145页

作者： kyung hyun Jin Tae Gi kim Department of Ophthalmology Kyung Hee University Medical Center Kyung Hee University Seoul 02447 Korea Department of Ophthalmology Kyung Hee University Hospital at Gangdong Kyung Hee University Seoul 05278 Korea

AIM: To assess the early structural changes at clear corneal cataract incision sites and surgical outcomes using anterior segment optical coherence tomography(AS-OCT).METHODS: We evaluated 80 eyes of 59 patients who underwent phacoemulsification with a clear corneal incision. All incisions were evaluated 1 wk, 1, and 3 mo postoperatively using AS-OCT and analyzed regarding angle, length of the incision, maximal corneal thickness at the incision, and if present, corneal endothelial gap length and incision gap area. The patients were divided into two groups according to whether or not an endothelial gap was present at 1 wk postoperatively(endothelial gap, group 1;no endothelial gap, group 2). We analyzed the difference in patient and surgical factors between the two groups, and compared the surgical outcome and the refractive ***: An endothelial gap was observed in 56(70.0%) of 80 eyes at 1 wk postoperatively but not at 3 mo postoperatively. The mean patient age was significantly higher in group 1 than in group 2. The longer the length of the corneal incision and the steeper the incision angle, the greater the length and area of the endothelial gap. In group 1, the mean change in mean keratometry of the anterior cornea was significantly greater than in group 2, and the spherical equivalent(SE) and mean numerical error indicated significant myopic changes at 1 wk postoperatively. CONCLUSION: The risk of an endothelial gap increases with patient age and a long corneal incision and steep incision angle. The presence of an endothelial gap aftersurgery may affect the early postoperative corneal curvature and SE.

关键词： corneal incision structure phacoemulsification corneal curvature corneal endothelial gap anterior segment optical coherence tomography

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