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Design,fabrication,and structural safety validation of 3D-printable biporous bone augments

Bio-Design and Manufacturing 2023年第1期6卷 26-37页

作者： Yeokyung Kang Dasol Lim Doo-Hoon Sun jong-chul park Jungsung Kim Central Research&Development Center Corentec Company Ltd.33-2Banpo-daero 20-gilSeocho-guSeoulRepublic of Korea Cellbiocontrol Laboratory Department of Medical EngineeringYonsei University College of Medicine50-1 Yonsei-roSinchon-dongSeodaemun-guSeoulRepublic of Korea Department of Orthopaedic Surgery Daejeon Sun Hospital10-7 Mok-dongJung-guDaejeonRepublic of Korea

The use of commercial products such as a cup and liner for total hip arthroplasty for patients with severe bone defects has a high probability of *** these patients the cup alone cannot cover the bone defect,and thus,an additional augment or cage is *** this study,we designed three-dimensional(3D)printable bone augments as an alternative to surgeries using reinforcement ***-five sharp-edged bone augments of various sizes were 3D printed.A biporous structure was designed to reduce the weight of the augment and to facilitate bone *** types of frames were used to prevent damage to the augment’s porous structure and maintain its stability during ***,two types of holes were provided for easy augment fixation at various *** tests were performed on a combination of worst-case sizes derived using finite element *** test results confirmed the structural stability of the specimens at a load of 5340 *** the porosity of the specimens was measured to be 63.70%,it cannot be said that the porous nature was uniformly distributed because porosity tests were performed locally and *** summary,3D-printable biporous bone augments capable of bonding from various angles and bidirectionally through angulation and bottom-plane screw holes are *** mechanical results with bone augments indicate good structural safety in ***,further research is necessary to study the clinical applications of the proposed bone augment.

关键词： Bone augment 3D printing Biporous structure Total hip arthroplasty Metal implant

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An effective method to generate controllable levels of ROS for the enhancement of HUVEC proliferation using a chlorin e6-immobilized PET film as a photo-functional biomaterial

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Regenerative Biomaterials 2021年第2期8卷 94-103页

作者： Seung Hee Hong Min-Ah Koo Mi Hee Lee Gyeung Mi Seon Ye Jin park HaKyeong Jeong Dohyun Kim jong-chul park Cellbiocontrol Laboratory Department of Medical Engineering Department of Medical Engineering Graduate School of Medical ScienceBrain Korea 21 Project Department of Medical Device Engineering and Management Yonsei UniversityCollege of MedicineSeoul 03722Republic of Korea

Reactive oxygen species(ROS)are byproducts of cellular metabolism;they play a significant role as secondary messengers in cell *** cells,high concentrations of ROS induce apoptosis,senescence,and contact inhibition,while low concentrations of ROS result in angiogenesis,proliferation,and cytoskeleton ***,controlling ROS generation is an important factor in cell *** designed a chlorin e6(Ce6)-immobilized polyethylene terephthalate(PET)film(Ce6-PET)to produce extracellular ROS under red-light *** application of Ce6-PET films can regulate the generation of ROS by altering the intensity of light-emitting diode *** confirmed that the Ce6-PET film could effectively promote cell growth under irradiation at 500 μW/cm^(2) for 30 min in human umbilical vein endothelial *** also found that the Ce6-PET film is more efficient in generating ROS than a Ce6-incorporated polyurethane film under the same ***6-PET fabrication shows promise for improving the localized delivery of extracellular ROS and regulating ROS formation through the optimization of irradiation intensity.

关键词： reactive oxygen species chlorin e6 dopamine covalent bond HUVEC proliferation

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Effects of mesenchymal stem cell on dopaminergic neurons,motor and memory functions in animal models of parkinson's disease:a systematic review and meta-analysis

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Neural Regeneration Research 2024年第7期19卷 1584-1592页

作者： jong Mi park Masoud Rahmati Sang chul Lee Jae Il Shin Yong Wook Kim Department and Research Institute of Rehabilitation Medicine Yonsei University College of MedicineSeoulSouth Korea Department of Physical Education and Sport Sciences Faculty of Literature and Human SciencesLorestan UniversityKhoramabadIran Department of Pediatrics Yonsei University College of MedicineSeoulSouth Korea

parkinson’s disease is chara cterized by the loss of dopaminergic neurons in the substantia nigra pars com pacta,and although restoring striatal dopamine levels may improve symptoms,no treatment can cure or reve rse the disease *** cell therapy has a regenerative effect and is being actively studied as a candidate for the treatment of parkinson’s *** stem cells are considered a promising option due to fewer ethical concerns,a lower risk of immune rejection,and a lower risk of *** performed a meta-analysis to evaluate the therapeutic effects of mesenchymal stem cells and their derivatives on motor function,memory,and preservation of dopamine rgic neurons in a parkinson’s disease animal *** searched bibliographic databases(PubMed/MEDLINE,Embase,CENTRAL,Scopus,and Web of Science)to identify articles and included only pee r-reviewed in vivo interve ntional animal studies published in any language through J une 28,*** study utilized the random-effect model to estimate the 95%confidence intervals(CI)of the standard mean differences(SMD)between the treatment and control *** use the systematic review center for laboratory animal expe rimentation’s risk of bias tool and the collaborative approach to meta-analysis and review of animal studies checklist for study quality assessment.A total of 33studies with data from 840 parkinson’s disease model animals were included in the *** with mesenchymal stem cells significantly improved motor function as assessed by the amphetamine-induced rotational *** the stem cell types,the bone marrow MSCs with neurotrophic factor group showed la rgest effect size(SMD[95%CI]=-6.21[-9.50 to-2.93],P=0.0001,I^(2)=0.0%).The stem cell treatment group had significantly more tyrosine hydroxylase positive dopamine rgic neurons in the striatum([95%CI]=1.04[0.59 to 1.49],P=0.0001,I^(2)=65.1%)and substantia nigra(SMD[95%CI]=1.38[0.89 to 1.87],P=0.0001,I^(2)=75.3%),indicating a

关键词： animal animal experimentation mesenchymal stem cells models parkinson’s disease stem cell transplantation

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RGD peptide and graphene oxide co-functionalized PLGA nanofiber scaffolds for vascular tissue engineering

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Regenerative Biomaterials 2017年第3期4卷 159-166页

作者： Yong Cheol Shin Jeonghyo Kim Sung Eun Kim Su-Jin Song SuckWon Hong Jin-Woo Oh Jaebeom Lee jong-chul park Suong-Hyu Hyon Dong-Wook Han Department of Cogno-Mechatronics Engineering Department of Optics and Mechatronics Engineering Department of Nanoenergy Engineering College of Nanoscience and NanotechnologyPusan National UniversityBusan 46241Korea Cellbiocontrol Laboratory Department of Medical EngineeringYonsei University College of MedicineSeoul 03722Korea and 5Center for Fiber and Textile Science Kyoto Institute of TechnologyMatsugasakiKyoto 606-8585Japan

In recent years,much research has been suggested and examined for the development of tissue engineering scaffolds to promote cellular *** our study,RGD peptide and graphene oxide(GO)co-functionalized poly(lactide-co-glycolide,PLGA)(RGD-GO-PLGA)nanofiber mats were fabricated via electrospinning,and their physicochemical and thermal properties were characterized to explore their potential as biofunctional scaffolds for vascular tissue *** electron microscopy images revealed that the RGD-GO-PLGA nanofiber mats were readily fabricated and composed of randomoriented electrospun nanofibers with average diameter of *** successful co-functionalization of RGD peptide and GO into the PLGA nanofibers was confirmed by Fourier-transform infrared spectroscopic ***,the surface hydrophilicity of the nanofiber mats was markedly increased by co-functionalizing with RGD peptide and *** was found that the mats were thermally stable under the cell culture ***,the initial attachment and proliferation of primarily cultured vascular smoothmuscle cells(VSMCs)on the RGD-GO-PLGA nanofibermats were *** was revealed that the RGD-GO-PLGA nanofibermats can effectively promote the growth of *** conclusion,our findings suggest that the RGD-GO-PLGA nanofiber mats can be promising candidates for tissue engineering scaffolds effective for the regeneration of vascular smooth muscle.

关键词： RGD peptide graphene oxide poly(lactic-co-glycolic acid) biofunctional scaffold vascular smooth muscle cell

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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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Preconditioning process for dermal tissue decellularization using electroporation with sonication

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Regenerative Biomaterials 2022年第1期9卷 22-29页

作者： Mi Hee Leeand jong-chul park Min-Ah Koo HaKyeong Jeong Seung Hee Hong Gyeung Mi Seon Mi Hee Lee jong-chul park Cellbiocontrol Laboratory Yonsei University College of Medicine50-1 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Medical Engineering Graduate School of Medical ScienceBrain Korea 21 ProjectYonsei University College of Medicine50-1 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea

Decellularization to produce bioscaffolds composed of the extracellular matrix(ECM)uses enzymatic,chemical and physical methods to remove antigens and cellular components from *** decellularization methods depend on the characteristics of tissues,and in particular,tissues with dense,complex structure and abundant lipid content are difficult to completely *** study enables future research on the development of methods and treatments for fabricating bioscaffolds via decellularization of complex and rigid skin tissues,which are not commonly considered for decellularization to date as their structural and functional characteristics could not be preserved after severe *** this study,decellularization of human dermal tissue was done by a combination of both chemical(0.05%trypsin-EDTA,2%SDS and 1%Triton X-100)and physical methods(electroporation and sonication).After decellularization,the content of DNA remaining in the tissue was quantitatively confirmed,and the structural change of the tissue and the retention and distribution of ECM components were evaluated through histological and histochemical analysis,*** of the chemical pretreatment that increase the efficiency of physical stimulation as well as decellularization,and conditions for electroporation and sonication without the use of detergents,unlike the methods performed in previous studies,were established to enable the complete decellularization of the skin *** combinatorial decellularization treatment formed micropores in the lipid bilayers of the skin tissues while removing all cell and cellular residues without affecting the ECM ***,this procedure can be widely used to fabricate bioscaffolds by decellularizing biological tissues with dense and complex structures.

关键词： decellularization electroporation sonication extracellular matrix

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Upcycling plastic wastes into value-added products via electrocatalysis and photoelectrocatalysis

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Journal of Energy Chemistry 2024年第4期91卷 522-541页

作者： Sungsoon Kim Dongjae Kong Xiaolin Zheng jong Hyeok park Department of Chemical&Biomolecular Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Mechanical Engineering Stanford UniversityStanfordCA 94305USA

Plastic,renowned for its versatility,durability,and cost-effectiveness,is indispensable in modern ***,the annual production of nearly 400 million tons of plastic,coupled with a recycling rate of only 9%,has led to a monumental environmental *** recycling has emerged as a vital response to this crisis,offering sustainable solutions to mitigate its environmental *** these recycling efforts,plastic upcycling has garnered attention,which elevates discarded plastics into higher-value ***,electrocatalytic and photoelectrocatalytic treatments stand at the forefront of advanced plastic *** or photoelectrocatalytic treatments involve chemical reactions that facilitate electron transfer through the electrode/electrolyte interface,driven by electrical or solar energy,*** methods enable precise control of chemical reactions,harnessing potential,current density,or light to yield valuable chemical *** review explores recent progress in plastic upcycling through electrocatalytic and photoelectrocatalytic pathways,offering promising solutions to the plastic waste crisis and advancing sustainability in the plastics industry.

关键词： Plastic upcycling Electrocatalytic reaction Photoelectrocatalytic reaction Value-added product

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

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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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A review of understanding electrocatalytic reactions in energy conversion and energy storage systems via scanning electrochemical microscopy

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Journal of Energy Chemistry 2024年第4期91卷 155-177页

作者： Jihye park jong Hwan Lim Jin-Hyuk Kang Jiheon Lim Ho Won Jang Hosun Shin Sun Hwa park Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Department of Material Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Applied Measurement Science University of Science and TechnologyDaejeon 34113Republic of Korea

To address climate change and promote environmental sustainability,electrochemical energy conversion and storage systems emerge as promising alternative to fossil fuels,catering to the escalating demand for *** optimal energy efficiency and cost competitiveness in these systems requires the strategic design of electrocatalysts,coupled with a thorough comprehension of the underlying mechanisms and degradation behavior occurring during the electrocatalysis *** electrochemical microscopy(SECM),an analytical technique for studying surface electrochemically,stands out as a powerful tool offering electrochemical *** possesses remarkable spatiotemporal resolution,enabling the visualization of the localized electrochemical activity and surface *** review compiles crucial research findings and recent breakthroughs in electrocatalytic processes utilizing the SECM methodology,specifically focusing on applications in electrolysis,fuel cells,and metal–oxygen batteries within the realm of energy conversion and storage *** with an overview of each energy system,the review introduces the fundamental principles of SECM,and aiming to provide new perspectives and broadening the scope of applied research by describing the major research categories within SECM.

关键词： Scanning electrochemical microscopy Electrocatalyst Electrocatalysis Water splitting Fuel cell Metal-oxygen battery

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Organic X-Ray Image Sensors Using a Medium Bandgap Polymer Donor with Low Dark Current

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Energy & Environmental Materials 2024年第6期7卷 230-237页

作者： jong-Woon Ha Seung Hun Eom Bo Kyung Cha Seyeong Song Hyeong Ju Eun jong H.Kim jong Mok park BongSoo Kim Byoungwook park Seo-Jin Ko Sung Cheol Yoon Changjin Lee In Hwan Jung Do-Hoon Hwang Department of Chemistry Chemistry Institute for Functional MaterialsPusan National UniversityBusan 46241Korea Division of Advanced Energy Materials Research Center Korea Research Institute of Chemical Technology(KRICT)Daejeon 34114Korea Electro-Medical Device Research Center Korea Electrotechnology Research Institute(KERI)Ansan 15588Korea Graduate School of Carbon Neutrality School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Molecular Science and Technology Ajou UniversitySuwon 16449Korea Research Center for Advanced Specialty Chemicals Korea Research Institute of Chemical TechnologyUlsan 44412Korea Department of Chemistry Ulsan National Institute of Science and Technology(UNIST)Ulsan 44919Korea Department of Organic and Nano Engineering Human-Tech Convergence ProgramHanyang University222 Wangsimni-roSeongdong-guSeoul 04763Korea

The development of portable X-ray detectors is necessary for diagnosing fractures in unconscious patients in emergency ***,this is quite challenging because of the heavy weight of the scintillator and silicon *** weight and thickness of X-ray detectors can be reduced by replacing the silicon layer with an organic *** study presents a novel bithienopyrroledione-based polymer donor that exhibits excellent photodetection properties even in a thick photoactive layer(~700 nm),owing to the symmetric backbone and highly soluble molecular structure of *** ability of bithienopyrroledione-based polymer donor to strongly suppress the dark current density(Jd~10−10 A cm^(−2))at a negative bias(−2.0 V)while maintaining high responsivity(R=0.29 A W−1)even at a thickness of 700 nm results in a maximum shot-noise-limited specific detectivity of D_(sh)^(*)=2.18×10^(13)Jones in the organic *** organic photodetectors are developed by slot-die coating for use in X-ray detectors,which exhibit D_(sh)^(*)=2.73×10^(12)Jones with clear rising(0.26 s)and falling(0.29 s)response times upon X-ray *** reliability is also proven by linear response of the X-ray detector,and the X-ray detection limit is 3 mA.

关键词： low dark current low detection limit organic photodetector printable X-ray

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