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Chae S, Choi WJ, Nebel LJ, Cho CH, Besford QA, Knapp A, Makushko P, Zabila Y, Pylypovskyi O, Jeong MW, Avdoshenko S, Sander O, Makarov D, Chung YJ, Fery A, Oh JY, Lee TI. Kinetically controlled metal-elastomer nanophases for environmentally resilient stretchable electronics. Nat Commun 2024; 15:3071. [PMID: 38594231 PMCID: PMC11004024 DOI: 10.1038/s41467-024-47223-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 03/23/2024] [Indexed: 04/11/2024] Open
Abstract
Nanophase mixtures, leveraging the complementary strengths of each component, are vital for composites to overcome limitations posed by single elemental materials. Among these, metal-elastomer nanophases are particularly important, holding various practical applications for stretchable electronics. However, the methodology and understanding of nanophase mixing metals and elastomers are limited due to difficulties in blending caused by thermodynamic incompatibility. Here, we present a controlled method using kinetics to mix metal atoms with elastomeric chains on the nanoscale. We find that the chain migration flux and metal deposition rate are key factors, allowing the formation of reticular nanophases when kinetically in-phase. Moreover, we observe spontaneous structural evolution, resulting in gyrified structures akin to the human brain. The hybridized gyrified reticular nanophases exhibit strain-invariant metallic electrical conductivity up to 156% areal strain, unparalleled durability in organic solvents and aqueous environments with pH 2-13, and high mechanical robustness, a prerequisite for environmentally resilient devices.
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Affiliation(s)
- Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069, Dresden, Germany
- School of Energy Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan, 31253, South Korea
| | - Won Jin Choi
- Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA, 94550, USA.
| | - Lisa Julia Nebel
- Institut für Numerische Mathematik, Technische Universität Dresden, Zellescher Weg 12-14, 01069, Dresden, Germany
| | - Chang Hee Cho
- Department of Materials Science and Engineering, Gachon University, Seong-nam, Gyeonggi 13120, Republic of Korea
| | - Quinn A Besford
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069, Dresden, Germany
| | - André Knapp
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069, Dresden, Germany
| | - Pavlo Makushko
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
| | - Yevhen Zabila
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
| | - Oleksandr Pylypovskyi
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
- Kyiv Academic University, 03142, Kyiv, Ukraine
| | - Min Woo Jeong
- Department of Chemical Engineering (Integrated Engineering Program), Kyung Hee University, Yongin, 17104, Republic of Korea
| | - Stanislav Avdoshenko
- Leibniz-Institut für Festkörper- und Werkstoffforschung e.V., Institute for Solid State Research, Nothnitzer Str. 49A, 01069, Dresden, Germany
| | - Oliver Sander
- Institut für Numerische Mathematik, Technische Universität Dresden, Zellescher Weg 12-14, 01069, Dresden, Germany
| | - Denys Makarov
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
| | - Yoon Jang Chung
- Department of Chemical and Biological Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069, Dresden, Germany
- Technische Universität Dresden, Mommsenstr. 4, 01062, Dresden, Germany
| | - Jin Young Oh
- Department of Chemical Engineering (Integrated Engineering Program), Kyung Hee University, Yongin, 17104, Republic of Korea.
| | - Tae Il Lee
- Department of Materials Science and Engineering, Gachon University, Seong-nam, Gyeonggi 13120, Republic of Korea.
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Lee G, Jang S, Kim YB, Cho D, Jeong D, Chae S, Myoung JM, Kim H, Kim SK, Lee JO. Ultrathin Metal Film on Graphene for Percolation-Threshold-Limited Thermal Emissivity Control. Adv Mater 2023; 35:e2301227. [PMID: 37200230 DOI: 10.1002/adma.202301227] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 05/12/2023] [Indexed: 05/20/2023]
Abstract
Translucent Au/graphene hybrid films are shown to be effective in reducing thermal emission from the underlying surfaces when the deposition thickness of Au is close to the percolation threshold. The critical Au deposition thickness for an abrupt change in emissivity is reduced from 15 nm (Si substrate) to a percolation-threshold-limited thickness of 8.5 nm (graphene/Si substrate) because of the chemical inertness of graphene leading to the deposited Au atoms forming a thin, crystalline layer. The effect of the graphene layer on the optical properties of the hybrid film is highlighted by a drastic increase in infrared absorptivity, whereas the visible absorptivity is marginally affected by the presence of a graphene layer. The level of thermal emission from the Au/graphene hybrid films with the percolation-threshold-limited Au thickness is stable even with high background temperatures of up to 300 °C and mechanical strains of ≈4%. As an example of a thermal management application, an anti-counterfeiting device is demonstrated; thermal-camouflage-masked text fabricated with an Au/graphene hybrid film is discernible only using a thermographic camera. Ultrathin metal film assisted by a graphene layer will provide a facile platform for thermal management with semi-transparency, flexibility, and transferability to arbitrary surfaces.
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Affiliation(s)
- Geonhee Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeong-ro 141, Daejeon, 34114, Republic of Korea
| | - Sojeong Jang
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeong-ro 141, Daejeon, 34114, Republic of Korea
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Young-Bin Kim
- Department of Applied Physics, Kyung Hee University, 1732 Deogyeong-daero, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
| | - Donghwi Cho
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeong-ro 141, Daejeon, 34114, Republic of Korea
| | - Duwon Jeong
- Department of Physics, Sungkyunkwan University (SKKU), Suwon-si, Gyeonggi-do, 16419, Republic of Korea
| | - Soosang Chae
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeong-ro 141, Daejeon, 34114, Republic of Korea
| | - Jae-Min Myoung
- Department of Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Hyunwoo Kim
- Drug Discovery Platform Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea
| | - Sun-Kyung Kim
- Department of Applied Physics, Kyung Hee University, 1732 Deogyeong-daero, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
| | - Jeong-O Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeong-ro 141, Daejeon, 34114, Republic of Korea
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3
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Park J, Min S, Chae S. P207 Postoperative outcomes of replacement technique using the acellular dermal matrix as filler for BCS patients. Breast 2023. [DOI: 10.1016/s0960-9776(23)00325-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023] Open
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Lee G, Oh Y, Nam JT, Ji S, Jang AR, Jeong DW, Kang M, Lee SS, Chae S, Cho D, Hwang JY, Lee K, Lee JO. Multifunctional-high resolution imaging plate based on hydrophilic graphene for digital pathology. Nanotechnology 2022; 33:505101. [PMID: 36095982 DOI: 10.1088/1361-6528/ac9143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 09/12/2022] [Indexed: 06/15/2023]
Abstract
In the present study, we showed that hydrophilic graphene can serve as an ideal imaging plate for biological specimens. Graphene being a single-atom-thick semi-metal with low secondary electron emission, array tomography analysis of serial sections of biological specimens on a graphene substrate showed excellent image quality with improvedz-axis resolution, without including any conductive surface coatings. However, the hydrophobic nature of graphene makes the placement of biological specimens difficult; graphene functionalized with polydimethylsiloxane oligomer was fabricated using a simple soft lithography technique and then processed with oxygen plasma to provide hydrophilic graphene with minimal damage to graphene. High-quality scanning electron microscopy images of biological specimens free from charging effects or distortion were obtained, and the optical transparency of graphene enabled fluorescence imaging of the specimen; high-resolution correlated electron and light microscopy analysis of the specimen became possible with the hydrophilic graphene plate.
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Affiliation(s)
- Geonhee Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Yuna Oh
- Korea Institute of Science and Technology, 5. Hwarang-ro 14-gil, Seongbuk-gu, Seoul, Republic of Korea
| | - Jung Tae Nam
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 55324, Republic of Korea
| | - Seulgi Ji
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - A-Rang Jang
- Division of Electrical, Electronic and Control Engineering, Kongju National University, Cheonan 31080, Republic of Korea
| | - Du Won Jeong
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - MinSoung Kang
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Sun Sook Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Soosang Chae
- Department of Nanostructured Materials, Leibniz Institute of Polymer Research Dresden, D-01069, Dresden, Germany
| | - Donghwi Cho
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
| | - Jun Yeon Hwang
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 55324, Republic of Korea
| | - Kyungeun Lee
- Korea Institute of Science and Technology, 5. Hwarang-ro 14-gil, Seongbuk-gu, Seoul, Republic of Korea
| | - Jeong-O Lee
- Advanced Materials Division, Korea Research Institute of Chemical Technology, Gajeongro 141, Daejeon, Republic of Korea
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Seo H, Kim B, Lee KH, Chae S, Jung J. Local Disordering in the Amorphous Network of a Solution-Processed Indium Tin Oxide Thin Film. ACS Appl Mater Interfaces 2022; 14:25620-25628. [PMID: 35537705 DOI: 10.1021/acsami.2c01482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The polyhedra unit structure (MOx) in an amorphous metal oxide network has more freedom and flexibility than the same unit structure in a crystalline phase. Consequently, a mild external stimulus (e.g., instant photonic and acoustic energy) could affect and change this network parameter, thereby enhancing and modulating the electrical properties. However, it is difficult to tune these atomic parameters solely while maintaining the metal oxide's initial global amorphous phase and thereby preventing mechanical instability at the film-substrate interface (i.e., cracking or distortion). Here, we report local disordering in an amorphous network of a solution-processable indium tin oxide (ITO) film, where the disordering is triggered by mild-light irradiation (<0.1 mJ/cm2). Through a combination of systematic characterizations of the global structural and chemical compositional changes in conjunction with extended X-ray absorption fine structure analyses, we revealed the distortion of the atomic structure in the amorphous network of the ITO film led to the formation of additional structural oxygen vacancies. Our findings enabled us to fabricate mechanical-instability-free, perfect amorphous-phase ITO thin films on plastic substrates, where the sheet resistance substantially decreased to ∼ 2 × 103 Ω/□. Furthermore, this sheet resistance did not vary when the film and substrate were bent to a radius of 2 mm and could operate at low temperatures. This work can pave the novel way to fabricate high-quality flexible transparent electrodes suitable for rapid, cost-effective, and patternable processing on plastic substrates, and the domain can be extended to flexible electronics.
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Affiliation(s)
- Hyunjeong Seo
- Department of Chemistry, Hannam University, Daejeon 34054, Korea
| | - Byeongsoo Kim
- Department of Chemistry, Hannam University, Daejeon 34054, Korea
| | - Keun Ho Lee
- Raphas R&D Centre, Raphas Co. Ltd., Seoul 07793 Korea
| | - Soosang Chae
- Institute of Physical Chemistry and Polymer Physics, IPF─Leibniz-Institut für Polymerforschung Dresden e.V., Dresden 01069, Germany
| | - Jongjin Jung
- Department of Chemistry, Hannam University, Daejeon 34054, Korea
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6
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Besford QA, Schubotz S, Chae S, Özdabak Sert AB, Weiss ACG, Auernhammer GK, Uhlmann P, Farinha JPS, Fery A. Molecular Transport within Polymer Brushes: A FRET View at Aqueous Interfaces. Molecules 2022; 27:molecules27093043. [PMID: 35566393 PMCID: PMC9102696 DOI: 10.3390/molecules27093043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/04/2022] [Accepted: 05/05/2022] [Indexed: 11/17/2022] Open
Abstract
Molecular permeability through polymer brush chains is implicated in surface lubrication, wettability, and solute capture and release. Probing molecular transport through polymer brushes can reveal information on the polymer nanostructure, with a permeability that is dependent on chain conformation and grafting density. Herein, we introduce a brush system to study the molecular transport of fluorophores from an aqueous droplet into the external “dry” polymer brush with the vapour phase above. The brushes consist of a random copolymer of N-isopropylacrylamide and a Förster resonance energy transfer (FRET) donor-labelled monomer, forming ultrathin brush architectures of about 35 nm in solvated height. Aqueous droplets containing a separate FRET acceptor are placed onto the surfaces, with FRET monitored spatially around the 3-phase contact line. FRET is used to monitor the transport from the droplet to the outside brush, and the changing internal distributions with time as the droplets prepare to recede. This reveals information on the dynamics and distances involved in the molecular transport of the FRET acceptor towards and away from the droplet contact line, which are strongly dependent on the relative humidity of the system. We anticipate our system to be extremely useful for studying lubrication dynamics and surface droplet wettability processes.
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Affiliation(s)
- Quinn A. Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
- Correspondence: (Q.A.B.); (A.F.)
| | - Simon Schubotz
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Soosang Chae
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Ayşe B. Özdabak Sert
- Molecular Biology and Genetics Department, Istanbul Technical University, 34469 Istanbul, Turkey;
| | - Alessia C. G. Weiss
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Günter K. Auernhammer
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - Petra Uhlmann
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
| | - José Paulo S. Farinha
- Centro de Química Estrutural, Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal;
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany; (S.S.); (S.C.); (A.C.G.W.); (G.K.A.); (P.U.)
- Correspondence: (Q.A.B.); (A.F.)
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7
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Hee Cho C, Choe YS, Chae S, Il Lee T. Highly sensitive breath sensor based on sonochemically synthesized cobalt-doped zinc oxide spherical beads. Ultrason Sonochem 2022; 84:105956. [PMID: 35190351 PMCID: PMC8861145 DOI: 10.1016/j.ultsonch.2022.105956] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 01/22/2022] [Accepted: 02/14/2022] [Indexed: 06/14/2023]
Abstract
In this study, we introduce cobalt (Co)-doped zinc oxide (ZnO) spherical beads (SBs), synthesized using a sonochemical process, and their utilization for an acetone sensor that can be applied to an exhalation diagnostic device. The sonochemically synthezied Co-doped ZnO SBs were polycrystalline phases with sizes of several hundred nanometers formed by the aggregation of ZnO nanocrystals. As the Co doping concentration increased, the amount of substitutionally doped Co2+ in the ZnO nanocrystals increased, and we observed that the fraction of Co3+ in the Co-doped ZnO SBs increased while the fraction of oxygen vacancies decreased. At an optimal Co-doping concentration of 2 wt%, the sensor operating temperature decreased from 300 to 250 °C, response to 1 ppm acetone improved from 3.3 to 7.9, and minimum acetone detection concentration was measured at 43 ppb (response, 1.75). These enhancements are attributed to the catalytic role of Co3+ in acetone oxidation. Finally, a sensor fabricated using 2 wt% Co-doped ZnO SBs was installed in a commercially available exhalation diagnostic device to successfully measure the concentration of acetone in 1 ml of exhaled air from a healthy adult, returning a value of 0.44 ppm.
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Affiliation(s)
- Chang Hee Cho
- Department of Materials Science and Engineering, Gachon University, Seong-nam, Gyeonggi 13120, Korea
| | - Yong-Sahm Choe
- iSenLab Inc. Dunchondae-ro 545, Jungwong-gu, Seong-nam, Gyeonggi, Korea
| | - Soosang Chae
- IPF - Leibniz-Institut für Polymerforschung Dresden e.V, Institute of Physical Chemistry and Polymer Physics, 01069 Dresden, Germany.
| | - Tae Il Lee
- Department of Materials Science and Engineering, Gachon University, Seong-nam, Gyeonggi 13120, Korea.
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8
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Kim JY, Chae S, Jang W, Besford QA, Oh JY, Lee TI. Antioxidant Triggered Metallic 1T' Phase Transformations of Chemically Exfoliated Tungsten Disulfide (WS 2 ) Nanosheets. Small 2022; 18:e2107557. [PMID: 35146916 DOI: 10.1002/smll.202107557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/20/2022] [Indexed: 06/14/2023]
Abstract
Developing facile methods for inducing phase transformation between metallic and semiconducting 2D transition metal dichalcogenide (TMDC) materials is crucial toward leveraging their use in cutting-edge energy devices. Herein, 2H-to-1T' phase transformations in chemically exfoliated Tungsten Disulfide (WS2 ) nanosheet films, triggered by antioxidants toward highly conductive 2D TMDC electrode materials, are introduced. It is found that antioxidants cause residual LiOx compounds to reduce to Li metal, subsequently inducing 1T' phase transformations in layered WS2 nanosheets, resulting in significantly enhanced conductivity across the overall films. Both thermoelectric devices and supercapacitors are fabricated utilizing the highly conductive 1T' phase WS2 nanosheet films as a working electrode, allowing for outstanding performance due to the increased conductivity of the WS2 nanosheet films. The method constitutes a facile approach toward the use of chemically exfoliated 1T' TMDC nanosheets for highly efficient energy device applications.
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Affiliation(s)
- Jun Yeob Kim
- Department of Materials Science and Engineering, Gachon University, Seong-nam, Gyeonggi, 13120, Republic of Korea
| | - Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069, Dresden, Germany
| | - Woosun Jang
- Center for Artificial Synesthesia Materials Discovery, Yonsei University, Seoul, 03722, Republic of Korea
| | - Quinn A Besford
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069, Dresden, Germany
| | - Jin Young Oh
- Department of Chemical Engineering (Integrated Engineering Program), Kyung Hee University, Yongin, 17104, Republic of Korea
| | - Tae Il Lee
- Department of Materials Science and Engineering, Gachon University, Seong-nam, Gyeonggi, 13120, Republic of Korea
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Besford QA, Merlitz H, Schubotz S, Yong H, Chae S, Schnepf MJ, Weiss ACG, Auernhammer GK, Sommer JU, Uhlmann P, Fery A. Mechanofluorescent Polymer Brush Surfaces that Spatially Resolve Surface Solvation. ACS Nano 2022; 16:3383-3393. [PMID: 35112848 DOI: 10.1021/acsnano.2c00277] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Polymer brushes, consisting of densely end-tethered polymers to a surface, can exhibit rapid and sharp conformational transitions due to specific stimuli, which offer intriguing possibilities for surface-based sensing of the stimuli. The key toward unlocking these possibilities is the development of methods to readily transduce signals from polymer conformational changes. Herein, we report on single-fluorophore integrated ultrathin (<40 nm) polymer brush surfaces that exhibit changing fluorescence properties based on polymer conformation. The basis of our methods is the change in occupied volume as the polymer brush undergoes a collapse transition, which enhances the effective concentration and aggregation of the integrated fluorophores, leading to a self-quenching of the fluorophores' fluorescence and thereby reduced fluorescence lifetimes. By using fluorescence lifetime imaging microscopy, we reveal spatial details on polymer brush conformational transitions across complex interfaces, including at the air-water-solid interface and at the interface of immiscible liquids that solvate the surface. Furthermore, our method identifies the swelling of polymer brushes from outside of a direct droplet (i.e., the polymer phase with vapor above), which is controlled by humidity. These solvation-sensitive surfaces offer a strong potential for surface-based sensing of stimuli-induced phase transitions of polymer brushes with spatially resolved output in high resolution.
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Affiliation(s)
- Quinn A Besford
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Holger Merlitz
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Simon Schubotz
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Huaisong Yong
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Soosang Chae
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Max J Schnepf
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Alessia C G Weiss
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | | | - Jens-Uwe Sommer
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
- Institute for Theoretical Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - Petra Uhlmann
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung e.V., Hohe Str. 6, 01069 Dresden, Germany
- Technische Universität Dresden, Helmholtzstraße 10, 01062 Dresden, Germany
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10
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Chae S, Choi WJ, Fotev I, Bittrich E, Uhlmann P, Schubert M, Makarov D, Wagner J, Pashkin A, Fery A. Stretchable Thin Film Mechanical-Strain-Gated Switches and Logic Gate Functions Based on a Soft Tunneling Barrier. Adv Mater 2021; 33:e2104769. [PMID: 34486188 DOI: 10.1002/adma.202104769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/18/2021] [Indexed: 06/13/2023]
Abstract
Mechanical-strain-gated switches are cornerstone components of material-embedded circuits that perform logic operations without using conventional electronics. This technology requires a single material system to exhibit three distinct functionalities: strain-invariant conductivity and an increase or decrease of conductivity upon mechanical deformation. Herein, mechanical-strain-gated electric switches based on a thin-film architecture that features an insulator-to-conductor transition when mechanically stretched are demonstrated. The conductivity changes by nine orders of magnitude over a wide range of tunable working strains (as high as 130%). The approach relies on a nanometer-scale sandwiched bilayer Au thin film with an ultrathin poly(dimethylsiloxane) elastomeric barrier layer; applied strain alters the electron tunneling currents through the barrier. Mechanical-force-controlled electric logic circuits are achieved by realizing strain-controlled basic (AND and OR) and universal (NAND and NOR) logic gates in a single system. The proposed material system can be used to fabricate material-embedded logics of arbitrary complexity for a wide range of applications including soft robotics, wearable/implantable electronics, human-machine interfaces, and Internet of Things.
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Affiliation(s)
- Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V, Hohe Straße 6, 01069, Dresden, Germany
| | - Won Jin Choi
- Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Ivan Fotev
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
| | - Eva Bittrich
- Leibniz-Institut für Polymerforschung Dresden e.V, Hohe Straße 6, 01069, Dresden, Germany
| | - Petra Uhlmann
- Leibniz-Institut für Polymerforschung Dresden e.V, Hohe Straße 6, 01069, Dresden, Germany
- Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska, 68588, USA
| | - Mathias Schubert
- Leibniz-Institut für Polymerforschung Dresden e.V, Hohe Straße 6, 01069, Dresden, Germany
- Deprtment of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
- Department of Physics, Chemistry and Biology, (IFM), Linkoping University, Linkoping, 58183, Sweden
| | - Denys Makarov
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
| | - Jens Wagner
- Chair for Circuit Design and Network Theory, Technische Universität Dresden, 01062, Dresden, Germany
- Centre for Tactile Internet with Human-in-the-Loop (CeTI), Technische Universität Dresden, 01062, Dresden, Germany
| | - Alexej Pashkin
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V, Hohe Straße 6, 01069, Dresden, Germany
- Technische Universität Dresden, 01062, Dresden, Germany
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11
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Ditte K, Nguyen Le TA, Ditzer O, Sandoval Bojorquez DI, Chae S, Bachmann M, Baraban L, Lissel F. Rapid Detection of SARS-CoV-2 Antigens and Antibodies Using OFET Biosensors Based on a Soft and Stretchable Semiconducting Polymer. ACS Biomater Sci Eng 2021; 9:2140-2147. [PMID: 34519484 DOI: 10.1021/acsbiomaterials.1c00727] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the midst of the COVID-19 pandemic, adaptive solutions are needed to allow us to make fast decisions and take effective sanitation measures, e.g., the fast screening of large groups (employees, passengers, pupils, etc.). Although being reliable, most of the existing SARS-CoV-2 detection methods cannot be integrated into garments to be used on demand. Here, we report an organic field-effect transistor (OFET)-based biosensing device detecting of both SARS-CoV-2 antigens and anti-SARS-CoV-2 antibodies in less than 20 min. The biosensor was produced by functionalizing an intrinsically stretchable and semiconducting triblock copolymer (TBC) film either with the anti-S1 protein antibodies (S1 Abs) or receptor-binding domain (RBD) of the S1 protein, targeting CoV-2-specific RBDs and anti-S1 Abs, respectively. The obtained sensing platform is easy to realize due to the straightforward fabrication of the TBC film and the utilization of the reliable physical adsorption technique for the molecular immobilization. The device demonstrates a high sensitivity of about 19%/dec and a limit of detection (LOD) of 0.36 fg/mL for anti-SARS-Cov-2 antibodies and, at the same time, a sensitivity of 32%/dec and a LOD of 76.61 pg/mL for the virus antigen detection. The TBC used as active layer is soft, has a low modulus of 24 MPa, and can be stretched up to 90% with no crack formation of the film. The TBC is compatible with roll-to-roll printing, potentially enabling the fabrication of low-cost wearable or on-skin diagnostic platforms aiming at point-of-care concepts.
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Affiliation(s)
- Kristina Ditte
- Leibniz Institute of Polymer Research Dresden e.V., Hohe Straße 6, Dresden 01069, Germany.,Faculty of Chemistry and Food Chemistry, Dresden Technical University, Dresden 01062, Germany
| | - Trang Anh Nguyen Le
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, Dresden 01328, Germany.,Faculty of Medicine Carl Gustav Carus, Dresden Technical University, Dresden 01307, Germany
| | - Oliver Ditzer
- Leibniz Institute of Polymer Research Dresden e.V., Hohe Straße 6, Dresden 01069, Germany.,Faculty of Chemistry and Food Chemistry, Dresden Technical University, Dresden 01062, Germany
| | - Diana Isabel Sandoval Bojorquez
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, Dresden 01328, Germany
| | - Soosang Chae
- Leibniz Institute of Polymer Research Dresden e.V., Hohe Straße 6, Dresden 01069, Germany
| | - Michael Bachmann
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, Dresden 01328, Germany.,Faculty of Medicine Carl Gustav Carus, Dresden Technical University, Dresden 01307, Germany
| | - Larysa Baraban
- Institute of Radiopharmaceutical Cancer Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, Dresden 01328, Germany
| | - Franziska Lissel
- Leibniz Institute of Polymer Research Dresden e.V., Hohe Straße 6, Dresden 01069, Germany.,Faculty of Chemistry and Food Chemistry, Dresden Technical University, Dresden 01062, Germany.,Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstr. 10, Jena 07743, Germany
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12
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Tsuda T, Chae S, Al-Hussein M, Formanek P, Fery A. Flexible Pressure Sensors Based on the Controlled Buckling of Doped Semiconducting Polymer Nanopillars. ACS Appl Mater Interfaces 2021; 13:37445-37454. [PMID: 34328731 DOI: 10.1021/acsami.1c12530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Mechanically flexible and electrically conductive nanostructures are highly desired for flexible piezoresistive pressure sensors toward health monitoring or robotic skin applications. The popular approach for these sensors is to combine flexible but insulating polymers as a micro- or nanostructural functional medium and conductive materials covering the polymer surface, which could give rise to many practical issues, for example, durability, compatibility, and complicated processing steps. We herein report a piezoresistive pressure sensor with a functional component of nanopillars of a doped semiconducting polymer, operating at low bias voltage with a sensing mechanism based on controlled buckling. Nanopillars of poly(3-hexylthiophene-2,5-diyl) doped with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane are patterned using anodic aluminum oxide templates. The nanopillars impart reversible current changes in response to the applied pressure over a wide pressure range (0-400 kPa). The sensor exhibits two current response regimes. Below 50 kPa, a strongly nonlinear response is observed, and above 50 kPa, a linear pressure response is demonstrated. Euler buckling theory is used to predict the deformation behavior of the nanopillars under pressure and in turn elucidate the sensing mechanism. Our results demonstrate that the contact area between the nanopillars and the top electrode increases with the application of pressure due to their elastic buckling in a two-regime fashion underlining the two electrical current response regimes of the sensor. Independent finite element modeling and scanning electron microscopy measurements corroborated this sensing mechanism. In contrast to many reported pressure sensors, the controlled elastic buckling of the nanopillars enables the detection of pressure over a wide range with good sensitivity, excellent reproducibility, and cycling stability.
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Affiliation(s)
- Takuya Tsuda
- Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Hohe Str. 6, Dresden 01069, Germany
- Institute of Physical Chemistry of Polymeric Materials, Technische Universität Dresden, Dresden 01062, Germany
| | - Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Hohe Str. 6, Dresden 01069, Germany
| | - Mahmoud Al-Hussein
- Physics Department and Hamdi Mango Center for Scientific Research, The University of Jordan, Amman 11942, Jordan
| | - Petr Formanek
- Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Hohe Str. 6, Dresden 01069, Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V. (IPF), Hohe Str. 6, Dresden 01069, Germany
- Institute of Physical Chemistry of Polymeric Materials, Technische Universität Dresden, Dresden 01062, Germany
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Kim E, Cho MR, Byun SH, A Lim J, Chae S, Choi WK, Kim I, Kim J. Sympathetic predominance before tourniquet deflation is associated with a reduction in arterial blood pressure after tourniquet deflation during total knee arthroplasty. Physiol Res 2021; 70:401-412. [PMID: 33982581 DOI: 10.33549/physiolres.934639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
High dependency of arterial blood pressure (ABP) on enhanced sympathetic activity, which maintains vascular tone, leads to hypotension after hemodynamic insults that blunt the sympathetic activity. Therefore, we hypothesized that sympathovagal balance before tourniquet deflation (TD) determines the extent of a reduction in ABP after TD during total knee arthroplasty (TKA). Fifty-four hypertensive female patients undergoing TKA under spinal anesthesia were analyzed. The sympathovagal balance [low-to-high frequency ratio of heart rate variability (LF/HF)] before TD was defined as (LF/HF during 5 min before TD-preanesthetic LF/HF)/preanesthetic LF/HF (%). An increase in its value represents a shift in sympathovagal balance toward sympathetic predominance. The percent change in the mean ABP (MAP) after TD was defined as (minimum MAP during 10 min after TD-averaged MAP during 5 min before TD)/averaged MAP during 5 min before TD (%). Simple linear regression was performed to assess the correlation between the sympathovagal balance before TD and change in MAP after TD. The correlation was also assessed by multiple linear regression controlling for age, duration of tourniquet inflation, and spinal anesthesia-induced hypotension. Thirty-two minutes (on average) after tourniquet inflation, the MAP was decreased by 12.1 (-3.0 to 47.9) % [mean (range)] upon TD (P<0.001). The sympathovagal balance before TD was negatively proportional to the change in MAP after TD in both simple and multiple linear regression models (R2=0.323 and 0.340, P<0.001). A shift in sympathovagal balance toward sympathetic predominance before TD is associated with a decrease in ABP after TD.
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Affiliation(s)
- E Kim
- Department of Anesthesiology and Pain Medicine, Daegu Catholic University Medical Center, School of Medicine, Daegu Catholic University, Daegu, Republic of Korea.
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14
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Li Y, Männel MJ, Hauck N, Patel HP, Auernhammer GK, Chae S, Fery A, Li J, Thiele J. Embedment of Quantum Dots and Biomolecules in a Dipeptide Hydrogel Formed In Situ Using Microfluidics. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yue Li
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
| | - Max J. Männel
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
| | - Nicolas Hauck
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
| | - Himanshu P. Patel
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
| | | | - Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
- Technische Universität Dresden 01069 Dresden Germany
| | - Junbai Li
- Beijing National Laboratory for Molecular Sciences (BNLMS) CAS Key Laboratory of Colloids, Interface and Chemical, Thermodynamics Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
- University of Chinese Academy of Sciences 100049 Beijing China
| | - Julian Thiele
- Leibniz-Institut für Polymerforschung Dresden e.V. 01069 Dresden Germany
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15
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Li Y, Männel MJ, Hauck N, Patel HP, Auernhammer GK, Chae S, Fery A, Li J, Thiele J. Embedment of Quantum Dots and Biomolecules in a Dipeptide Hydrogel Formed In Situ Using Microfluidics. Angew Chem Int Ed Engl 2021; 60:6724-6732. [PMID: 33283395 PMCID: PMC7986802 DOI: 10.1002/anie.202015340] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Indexed: 01/03/2023]
Abstract
As low-molecular-weight hydrogelators, dipeptide hydrogel materials are suited for embedding multiple organic molecules and inorganic nanoparticles. Herein, a simple but precisely controllable method is presented that enables the fabrication of dipeptide-based hydrogels by supramolecular assembly inside microfluidic channels. Water-soluble quantum dots (QDs) as well as premixed porphyrins and a dipeptide in dimethyl sulfoxide (DMSO) were injected into a Y-shaped microfluidic junction. At the DMSO/water interface, the confined fabrication of a dipeptide-based hydrogel was initiated. Thereafter, the as-formed hydrogel flowed along a meandering microchannel in a continuous fashion, gradually completing gelation and QD entrapment. In contrast to hydrogelation in conventional test tubes, microfluidically controlled hydrogelation led to a tailored dipeptide hydrogel regarding material morphology and nanoparticle distribution.
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Affiliation(s)
- Yue Li
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
| | - Max J. Männel
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
| | - Nicolas Hauck
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
| | - Himanshu P. Patel
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
| | | | - Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
- Technische Universität Dresden01069DresdenGermany
| | - Junbai Li
- Beijing National Laboratory for Molecular Sciences (BNLMS)CAS Key Laboratory of Colloids, Interface and Chemical, ThermodynamicsInstitute of ChemistryChinese Academy of Sciences100190BeijingChina
- University of Chinese Academy of Sciences100049BeijingChina
| | - Julian Thiele
- Leibniz-Institut für Polymerforschung Dresden e.V.01069DresdenGermany
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Ditte K, Perez J, Chae S, Hambsch M, Al-Hussein M, Komber H, Formanek P, Mannsfeld SCB, Fery A, Kiriy A, Lissel F. Ultrasoft and High-Mobility Block Copolymers for Skin-Compatible Electronics. Adv Mater 2021; 33:e2005416. [PMID: 33314375 DOI: 10.1002/adma.202005416] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/05/2020] [Indexed: 06/12/2023]
Abstract
Polymer semiconductors (PSCs) are an essential component of organic field-effect transistors (OFETs), but their potential for stretchable electronics is limited by their brittleness and failure susceptibility upon strain. Herein, a covalent connection of two state-of-the-art polymers-semiconducting poly-diketo-pyrrolopyrrole-thienothiophene (PDPP-TT) and elastomeric poly(dimethylsiloxane) (PDMS)-in a single triblock copolymer (TBC) chain is reported, which enables high charge carrier mobility and low modulus in one system. Three TBCs containing up to 65 wt% PDMS were obtained, and the TBC with 65 wt% PDMS content exhibits mobilities up to 0.1 cm2 V-1 s-1 , in the range of the fully conjugated reference polymer PDPP-TT (0.7 cm2 V-1 s-1 ). The TBC is ultrasoft with a low elastic modulus (5 MPa) in the range of mammalian tissue. The TBC exhibits an excellent stretchability and extraordinary durability, fully maintaining the initial electric conductivity in a doped state after 1500 cycles to 50% strain.
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Affiliation(s)
- Kristina Ditte
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
| | - Jonathan Perez
- Center for Advancing Electronics Dresden and Faculty of Electrical and Computer Engineering, Technische Universität Dresden, Helmholtzstraße 18, Dresden, 01069, Germany
- Leibniz Institute for Solid State and Materials Research, Helmholtzstraße 20, Dresden, 01069, Germany
| | - Soosang Chae
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Mike Hambsch
- Center for Advancing Electronics Dresden and Faculty of Electrical and Computer Engineering, Technische Universität Dresden, Helmholtzstraße 18, Dresden, 01069, Germany
| | - Mahmoud Al-Hussein
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Physics Department and Hamdi Mango Center for Scientific Research, The University of Jordan, Amman, 11942, Jordan
| | - Hartmut Komber
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Peter Formanek
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Stefan C B Mannsfeld
- Center for Advancing Electronics Dresden and Faculty of Electrical and Computer Engineering, Technische Universität Dresden, Helmholtzstraße 18, Dresden, 01069, Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Anton Kiriy
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
| | - Franziska Lissel
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany
- Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, 01062, Germany
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Choi Y, Chung Y, Kim J, Hong M, Chae S, Hwang K, Yoon S. Association between polycystic ovary syndrome and the polymorphisms of aryl hydrocarbon receptor repressor, glutathione-s-transferase T1, and glutathione-S-transferase M1 genes. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Chae S, Kang KM, Kim HJ, Kang E, Park SY, Kim JH, Kim SH, Kim SW, Kim EK. Neutrophil-lymphocyte ratio predicts response to chemotherapy in triple-negative breast cancer. ACTA ACUST UNITED AC 2018; 25:e113-e119. [PMID: 29719435 DOI: 10.3747/co.25.3888] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Background The neutrophil-lymphocyte ratio (nlr) has been reported to correlate with patient outcome in several cancers, including breast cancer. We evaluated whether the nlr can be a predictive factor for pathologic complete response (pcr) after neoadjuvant chemotherapy (nac) in patients with triple-negative breast cancer (tnbc). Methods We analyzed the correlation between response to nac and various factors, including the nlr, in 87 patients with tnbc who underwent nac. In addition, we analyzed the association between the nlr and recurrence-free survival (rfs) in patients with tnbc. Results Of the 87 patients, 25 (28.7%) achieved a pcr. A high Ki-67 index and a low nlr were significantly associated with pcr. The pcr rate was higher in patients having a high Ki-67 index (≥15%) than in those having a low Ki-67 index (35.7% vs. 0%, p = 0.002) and higher in patients having a low nlr (≤1.7) than in those having a high nlr (42.1% vs. 18.4%, p = 0.018). In multiple logistic analysis, a low nlr remained the only predictive factor for pcr (odds ratio: 4.274; p = 0.008). In the survival analysis, the rfs was significantly higher in the low nlr group than in the high nlr group (5-year rfs rate: 83.7% vs. 66.9%; log-rank p = 0.016). Conclusions Our findings that the nlr is a predictor of pcr to nac and also a prognosticator of recurrence suggest an association between response to chemotherapy and inflammation in patients with tnbc. The pretreatment nlr can be a useful predictive and prognostic marker in patients with tnbc scheduled for nac.
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Affiliation(s)
| | | | | | | | | | - J H Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam; and
| | - S H Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam; and
| | - S W Kim
- Department of Surgery, Daerim St. Mary's Hospital, Seoul, Republic of Korea
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19
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Kim K, Cho Y, Shin K, Lee Y, Yokota M, Chae S, Park K, Uchida Y. 414 Both sphingosine kinase 1 and 2 coordinately regulate cathelicidin antimicrobial peptide production during keratinocyte differentiation. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Jung J, Kang E, Gwak JM, Seo AN, Park SY, Lee AS, Baek H, Chae S, Kim EK, Kim SW. Association between basal-like phenotype and BRCA1/2 germline mutations in Korean breast cancer patients. ACTA ACUST UNITED AC 2016; 23:298-303. [PMID: 27803593 DOI: 10.3747/co.23.3054] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
INTRODUCTION BRCA mutation testing allows index patients and their families to be provided with appropriate cancer risk-reduction strategies. Because of the low prevalence of BRCA mutations in unselected breast cancer patients and the high cost of genetic testing, it is important to identify the subset of women who are likely to carry BRCA mutations. In the present study, we examined the association between BRCA1/2 germline mutations and the immunohistochemical features of breast cancer. METHODS In a retrospective review of 498 breast cancer patients who had undergone BRCA testing at Seoul National University Bundang Hospital between July 2003 and September 2012, we gathered immunohistochemical information on estrogen receptor (er), progesterone receptor (pr), her2 (human epidermal growth factor receptor 2), cytokeratin 5/6, egfr (epidermal growth factor receptor), and p53 status. RESULTS Among the 411 patients eligible for the study, 50 (12.2%) had germline mutations in BRCA1 or BRCA2. Of the 93 patients with triple-negative breast cancer (tnbc), 25 with BRCA1/2 mutations were identified (BRCA1, 20.4%; BRCA2, 6.5%). On univariate analysis, er, pr, cytokeratin 5/6, egfr, and tnbc were found to be related to BRCA1 mutations, but on multivariate analysis, only tnbc was significantly associated with BRCA1 mutations. Among patients with early-onset breast cancer or with a family history of breast or ovarian cancer, BRCA1 mutations were significantly more prevalent in the tnbc group than in the non-tnbc group. CONCLUSIONS In the present study, tnbc was the only independent predictor of BRCA1 mutation in patients at high risk of hereditary breast and ovarian cancers. Other histologic features of basal-like breast cancer did not improve the estimate of BRCA1 mutation risk.
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Affiliation(s)
- J Jung
- Department of Surgery, Eulji University Hospital, Daejeon
| | - E Kang
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - J M Gwak
- Department of Pathology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - A N Seo
- Department of Pathology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - S Y Park
- Department of Pathology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - A S Lee
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - H Baek
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - S Chae
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - E K Kim
- Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam
| | - S W Kim
- Department of Surgery, Daerim St. Mary's Hospital, Seoul, Republic of Korea
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Lee A, Kang E, Baek H, Chae S, Kim EK, Kim S. 54O Evaluation of BRCA1/2 mutation prevalence in Korean women with triple-negative breast cancer. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv519.03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Baek H, Kim EK, Lee A, Chae S, Kang E, Kim SW. 91P A survey of margin status evaluation in the Korean Breast Cancer Society member. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv519.40] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Park Y, Kim B, Lee JW, Nam OH, Sone C, Park H, Eunsoon O, Shin H, Chae S, Cho J, Kim IH, Khim J, Cho S, Kim T. Characteristic of InGaN/GaN Laser Diode Grown by a Multi-Wafer MOCVD System. ACTA ACUST UNITED AC 2014. [DOI: 10.1557/s1092578300000570] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
InGaN/GaN multi-quantum well (MQW) laser diodes (LDs) were grown on c-plane sapphire substrates using a multi-wafer MOCVD system. The threshold current for pulsed lasing was 1.6 A for a gain-guided laser diode with a stripe of 10 × 800 μm2. The threshold current density was 20.3 kA cm−2 and the threshold voltage was 16.5 V. The optical power ratio of transverse electric mode to transverse magnetic mode was found to be greater than 50. The characteristic temperature measured from the plot of threshold current versus measurement temperature was between 130 and 150K.
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Chae S, Ahn BY, Byun K, Cho YM, Yu MH, Lee B, Hwang D, Park KS. A Systems Approach for Decoding Mitochondrial Retrograde Signaling Pathways. Sci Signal 2013; 6:rs4. [DOI: 10.1126/scisignal.2003266] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Ha Y, Lee EM, Lee YH, Kim CH, Kim D, Chae S, Ahn KK, Kim B, Chae C. Effects of a modified live CSFV vaccine on the development of PMWS in pigs infected experimentally with PCV-2. Vet Rec 2009; 164:48-51. [PMID: 19136684 DOI: 10.1136/vr.164.2.48] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The objective of this study was to determine the effect of vaccination against classical swine fever virus (CSFV) on the development of postweaning multisystemic wasting syndrome (PMWS) in conventional pigs infected experimentally with porcine circovirus type 2 (PCV-2). The pigs infected with PCV-2 and immunised with modified live CSFV developed mild to moderate PMWS, whereas none of the pigs infected with PCV-2 alone or immunised with modified live CSFV alone developed PMWS. Lesions histologically characteristic of PMWS were observed in lymph nodes from the pigs infected with PCV-2 and immunised with modified live CSFV vaccine, and extensive replication of PCV-2 was detected in the nodes by in situ hybridisation.
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Affiliation(s)
- Y Ha
- Department of Veterinary Pathology, Seoul National University, College of Veterinary Medicine, Seoul, Republic of Korea
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Ha Y, Ha SK, Lee YH, Kim D, Chae S, Kim CH, Ahn KK, Kim O, Chae C. Prevalence of tir gene subtypes in Escherichia coli isolates from pigs. Vet Rec 2008; 163:424-5. [PMID: 18836158 DOI: 10.1136/vr.163.14.424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Y Ha
- Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, Seoul, Republic of Korea
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Kim S, Park SY, Yong H, Famulski JK, Chae S, Lee JH, Kang CM, Saya H, Chan GK, Cho H. HBV X protein targets hBubR1, which induces dysregulation of the mitotic checkpoint. Oncogene 2008; 27:3457-64. [DOI: 10.1038/sj.onc.1210998] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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30
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Kim S, Yoon J, Chae S, Choi Y, Kim S, Moon S. An efficient and reliable DNA extraction method for preimplantation genetic diagnosis: a comparison of allele drop-out and amplification rate using different single cell lysis methods. Fertil Steril 2007. [DOI: 10.1016/j.fertnstert.2007.07.807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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31
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Ahn H, Chae S, Kim S, Wang C, Summers RS. Efficient taste and odour removal by water treatment plants around the Han River water supply system. Water Sci Technol 2007; 55:103-9. [PMID: 17489399 DOI: 10.2166/wst.2007.168] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Seven major water treatment plants in Seoul Metropolitan Area, which are under Korea Water Resources Corporation (KOWACO)'s management, take water from the Paldang Reservoir in the Han River System for drinking water supply. There are taste and odour (T&O) problems in the finished water because the conventional treatment processes do not efficiently remove the T&O compounds. This study evaluated T&O removal by ozonation, granular activated carbon (GAC) treatment, powder activated carbon (PAC) and an advanced oxidation process in a pilot-scale treatment plant and bench-scale laboratory experiments. During T&O episodes, PAC alone was not adequate, but as a pretreatment together with GAC it could be a useful option. The optimal range of ozone dose was 1 to 2 mg/L at a contact time of 10 min. However, with ozone alone it was difficult to meet the T&O target of 3 TON and 15 ng/L of MIB or geosmin. The GAC adsorption capacity for DOC in the three GAC systems (F/A, GAC and O3 + GAC) at an EBCT of 14 min is mostly exhausted after 9 months. However, substantial TON removal continued for more than 2 years (>90,000 bed volumes). GAC was found to be effective for T&O control and the main removal mechanisms were adsorption capacity and biodegradation.
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Affiliation(s)
- H Ahn
- Korea Water Resources Corporation, 462-1 Jeonmin-dong Yusung-ku Daejeon, South Korea
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32
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Abstract
Novelty stimuli cause various behavioral responses, such as exploration and avoidance, and contextual variables may contribute to the behavioral outputs. Here, we tried to compare the behavioral responses to novel objects of five inbred strains of mice (C57BL/6J, 129/svJae, C3H/HeJ, BALB/cJ and DBA/2J) by using a modified novel object test where a small light-weight cube wrapped with paper was presented to mice in a home cage without beddings. In response to these objects, the C57BL/6J, 129/svJae and C3H/HeJ mice showed mild exploratory behaviors, such as approaching, sniffing or brief contact. In striking contrast, the BALB/cJ and DBA/2J mice, which have been known to show high avoidance/low exploration in other behavioral paradigms, exhibited play-like secondary reactions toward the objects after initial primary exploratory behaviors. Specifically, DBA/2J mice would move the object around in the cage, holding it with their mouths, and BALB/cJ mice would gnaw the object, eventually stripping off the wrapping paper. Such behaviors decreased when similar objects were presented repeatedly. The present results suggest that active manipulations of novel objects may be a relevant parameter for measuring novelty-induced behaviors in mice and appear to be strongly influenced by genetic factors.
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Affiliation(s)
- D Kim
- Center for Calcium & Learning, Division of Life Sciences, Korea Institute of Science & Technology, Cheongryang, Seoul, Republic of Korea
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Chae H, Lee J, Byun J, Jung W, Kwak Y, Chae S, Kim H. Blockade of p38 mitogen-activated protein kinase pathway inhibits interleukin-6 release and expression in primary neonatal cardiomyocytes. Res Commun Mol Pathol Pharmacol 2003; 110:209-28. [PMID: 12760489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
The induction of interleukin-6 (IL-6) using combined proinflammatory agents (LPS/IFN-gamma or TNF-alpha/IFN-gamma) was studied in relation to p38 mitogen-activated protein kinase (MAPK) and NF-kappaB transcriptional factor in primary neonatal cardiomyocytes. When added to cultures of cardiomyocytes, the combined agents (LPS/IFN-gamma or TNF-alpha/IFN-gamma) had stimulatory effect on the production of IL-6 and the elevation was significantly reduced by SB203580, a specific p38 MAPK inhibitor. SB203580 inhibited protein production and gene expression of IL-6 in a concentration-dependent manner. In this study, IFN-gamma enhancement of TNF-alpha-induced NF-kappaB binding affinity as well as p38 MAP kinase activation was observed. However, a specific inhibitor of p38 MAPK, SB203580, had no effect on TNF-alpha/IFN-gamma or LPS/IFN-gamma-induced NF-kappaB activation. This study strongly suggests that these pathways about TNF-alpha/IFN-gamma or LPS/IFN-gamma-activated IL-6 release can be primarily dissociated in primary neonatal cardiomyocytes.
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Affiliation(s)
- H Chae
- Department of Dental Pharmacology, Wonkwang Dental Research Institute, School of Dentistry, Wonkwang University, Iksan Chonbuk, 570-749, South Korea
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Chae S, Yang D, Park H, Cho Y, Jun J, Park W. IP-0052 Serun neopterin predicts severity of coronary artery stenosis and prognosis in acute coronary syndrome. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90127-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chae S, Lee J, Yang D, Park H, Cho Y, Jun J. 3P-0844 The short-term prognostic value of mean platelet volume in acute myocardial infarction. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)91062-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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36
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Chae H, Chae S, Park N, Bang B, Cho S, Kim J, Kim H, Kim H, Lee Z, Kim H. Pyrrolidine dithiocarbamate inhibits serum-induced NF-κB activation and induces apoptosis in ROS 17/2.8 osteoblasts. Int Immunopharmacol 2001; 1:255-63. [PMID: 11360927 DOI: 10.1016/s1567-5769(00)00025-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Nuclear factor-kappaB (NF-kappaB) activity affects cell survival in ROS 17/2.8 osteoblasts. Preventing NF-kappaB transcription activity with a potent NF-kappaB inhibitor, pyrrolidine dithiocarbamate (PDTC), results in apoptosis. Thus, we explored the effect of pyrrolidine dithiocarbamate (PDTC), which potently blocks the activation of nuclear factor-kappaB (NF-kappaB) in serum-exposed condition, on the activation of mitogen activated protein kinase (MAPK), especially, JNK/SAPK and p38 MAPK induction. PDTC transiently increased the phosphotransferase activity of c-Jun N-terminal Kinase1 (JNK1), which might in turn activates transcriptional activity of activating protein-1 (AP-1). The activation of JNK was completely decreased in dominant negative JNK1 transfected cells and the PDTC-induced cell death was attenuated in these cells. In addition, AP-1 activation was decreased in the JNK1 transfected cells, compared with vector-transfected cells. The NF-kappaB inhibitor also transiently activates p38 MAPK but SB203580, a specific p38 MAPK inhibitor, does not have any regulatory effect on PDTC-induced cell death, suggesting that the cell death is mediated by JNK not by p38 MAPK. Thus, overall, these results show that PDTC induces apoptosis and suggest that JNK/SAPK and subsequent AP-1 activation may be involved in the apoptotic pathway in ROS 17/2.8 osteoblasts.
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Affiliation(s)
- H Chae
- Department of Dental Pharmacology, School of Dentistry, Wonkwang University, Iksan, Chonbuk, South Korea
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37
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Shin M, Chae S, Kim C, Jung T, Park J. Changing trends of clinical aspects in lung cancer from 1988 to 1999. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80801-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Chae P, Shin M, Cha S, Chae S, Kim C, Jung T, Park J. Can we perform the same staging workup in lung cancer regardless of histologic type? Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80909-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Hirose S, Inazu Y, Chae S, Maeda Y. Suppression of the growth/differentiation transition in Dictyostelium development by transient expression of a novel gene, dia1. Development 2000; 127:3263-70. [PMID: 10887082 DOI: 10.1242/dev.127.15.3263] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In Dictyostelium discoideum Ax-2 cells, a specific checkpoint (PS point) from which cells enter the differentiation phase in response to starvation has been specified in the cell cycle. Using the differential display method, we isolated a novel gene, dia1 (differentiation-associated gene 1), that is specifically expressed in cells differentiating from the PS point. The dia1 mRNA has an open reading frame of 1,368 bp and is deduced to code for a 48.6 kDa protein (DIA1). The DIA1 protein is highly serine-rich and the serine residues are predominantly located in the C-terminal region. After the PSORT II search, the protein is predicted to be GPI-anchored at the plasma membrane. Unexpectedly, dia1 overexpression rather impaired the progression of differentiation, possibly coupled with the reduced expression of early genes such as cAMP receptor1 (car1). The inhibitory effect of dia1 expression on early differentiation was almost completely nullified by externally applied cAMP pulses. In contrast to dia1 overexpression, antisense RNA-mediated dia1 inactivation was found to enhance the initial step of cell differentiation, as exemplified by precocious expression of car1 and other early genes. We discuss the unique structure and function of DIA1 in relation to the cooperative development of cells during the establishment of multicellular organization.
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Affiliation(s)
- S Hirose
- Biological Institute, Graduate School of Science, Tohoku University, Aoba, Sendai 980-8578, Japan.
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41
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Badve S, Lôgdberg L, Sokhi R, Sigal SH, Botros N, Chae S, Das KM, Gupta S. An antigen reacting with das-1 monoclonal antibody is ontogenically regulated in diverse organs including liver and indicates sharing of developmental mechanisms among cell lineages. Pathobiology 2000; 68:76-86. [PMID: 10878504 DOI: 10.1159/000028117] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The monoclonal antibody designated mAb Das-1, which was generated against a colon epithelial protein, reacts with the normal biliary epithelium and keratinocytes, which are among targets of tissue injury in ulcerative colitis. Moreover, mAb Das-1 reacts with abnormal cells in Barrett's esophagus and chronic cystitis profunda, as well as so-called 'oval cells' in the adult liver, which are considered oncogenic progenitor cells. To establish ontogenic regulation of mAb Das-1 reactivity, we studied 7- to 24-week-old human fetuses by immunohistochemistry. In liver, mAb Das-1 reactivity was further correlated with glycogen, dipeptidyl peptidase IV, glucose-6-phosphatase and gamma-glutamyl transpeptidase expression. mAb Das-1 reacted with cells in organs arising from the pharyngeal cleft (thymus), primitive gut (oral cavity, pharynx, lung, esophagus, stomach, biliary tree, pancreas, liver, colon), ureteric bud (renal tubules, collecting duct), mesonephros (kidney, testis), mesoderm (muscle) and elsewhere (skin, adrenal cortex). In distinction from the adult liver, mAb Das-1 staining was more pronounced in hepatoblasts compared with biliary cells. In adult tissues, however, mAb Das-1 reactivity was restricted to the colon, biliary epithelium, keratinocytes, and ciliary body. These data indicated that the mAb Das-1 recognized epitopes in fetal cells of diverse ectodermal, mesodermal and endodermal origin, compatible with sharing of lineage mechanisms in tissues. Reactivation of mAb Das-1 staining in epithelial precancerous conditions, including carcinomas arising in these organs, is compatible with oncofetal regulation of the antigen, which will facilitate analysis of cell subpopulations during organ development, regeneration and oncogenesis.
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Affiliation(s)
- S Badve
- Department of Pathology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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42
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Cho S, Jang S, Chae S, Chung KM, Moon YH, An G, Jang SK. Analysis of the C-terminal region of Arabidopsis thaliana APETALA1 as a transcription activation domain. Plant Mol Biol 1999; 40:419-29. [PMID: 10437826 DOI: 10.1023/a:1006273127067] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
APETALA1 (AP1) of Arabidopsis thaliana is a transcription factor controlling flower development. AP2 is a member of the MADS (MCM1, AGAMOUS, DEFICIENS, SRF) superfamily, which plays important roles in differentiation in plants and animals. MADS domains, which function most importantly in DNA binding, are found in all major eukaryotic kingdoms. In plants, MADS domain-containing proteins also possess a region of moderate sequence similarity named the K domain, which is involved in protein-protein interaction. Little is known about the function of a third, highly variable, domain designated the C domain, as it resides at the C terminus of the MADS proteins of plants. Here we report that the C-terminal domain of Arabidopsis thaliana AP1 and its homologues perform a transcriptional activation function. The C-terminal region of AP1 is composed of at least two separable transcriptional activation domains that function synergistically.
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Affiliation(s)
- S Cho
- Department of Life Science, Pohang University of Science and Technology, Kyungbuk, Korea
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43
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Cho S, Jang S, Chae S, Chung KM, Moon YH, An G, Jang SK. Analysis of the C-terminal region of Arabidopsis thaliana APETALA1 as a transcription activation domain. Plant Mol Biol 1999; 40:419-429. [PMID: 10437826 DOI: 10.1023/a:100627312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
APETALA1 (AP1) of Arabidopsis thaliana is a transcription factor controlling flower development. AP2 is a member of the MADS (MCM1, AGAMOUS, DEFICIENS, SRF) superfamily, which plays important roles in differentiation in plants and animals. MADS domains, which function most importantly in DNA binding, are found in all major eukaryotic kingdoms. In plants, MADS domain-containing proteins also possess a region of moderate sequence similarity named the K domain, which is involved in protein-protein interaction. Little is known about the function of a third, highly variable, domain designated the C domain, as it resides at the C terminus of the MADS proteins of plants. Here we report that the C-terminal domain of Arabidopsis thaliana AP1 and its homologues perform a transcriptional activation function. The C-terminal region of AP1 is composed of at least two separable transcriptional activation domains that function synergistically.
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Affiliation(s)
- S Cho
- Department of Life Science, Pohang University of Science and Technology, Kyungbuk, Korea
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44
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Moon YH, Chae S, Jung JY, An G. Expressed sequence tags of radish flower buds and characterization of a CONSTANS LIKE 1 gene. Mol Cells 1998; 8:452-8. [PMID: 9749533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Expressed sequence tag (EST) analysis was conducted for young flower buds of radish plants. Among a total of 66 ESTs examined, 40 showed a significant similarity to previously identified genes. Twenty-eight ESTs were similar to proteins identified in other plants, 11 were similar to eukaryotic proteins other than plants, and one was similar to a prokaryotic protein. Four clones were selected for further studies. EST clone 81, which showed a homology to germin-like proteins was expressed more abundantly in leaves and roots as compared to flower buds. Clone 105 was highly homologous to the translation inhibitor protein and was expressed in all three organs, but the expression level was higher in flower buds and roots. Another EST clone, 133, which shared a significant similarity with the Ran-binding protein, hybridized to two different size transcripts that were detectable only in flower buds. Clone 39 was a homolog of CONSTANS, which is a gene involved in controlling the flowering time in Arabidopsis. The cDNA clone of EST clone 39 containing the entire open reading frame was obtained and designated as RsCOL1 (Raphanus sativus CONSTANS LIKE 1). It was 1049 bp long and contained an open reading frame of 307 amino acid residues (calculated molecular mass = 33.1 kDa). The RsCOL1 protein contained two putative zinc finger motifs in the amino terminal region which were 59% identical to the corresponding region of the Arabidopsis CO protein. The radish protein also contained a predicted nuclear localization domain in the carboxyl terminal region which was 87% identical to the corresponding region of CO. DNA blot analysis revealed that the radish genome contained several genes similar to RsCOL1. RNA blot analysis showed that RsCOL1 was strongly expressed in flower buds at the early bolting stage, and the expression level declined as the flower bud matured. The transcript was also detectable in leaves and roots. In mature flowers, the RsCOL1 transcript was present primarily in carpels.
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Affiliation(s)
- Y H Moon
- Department of Life Science, Pohang University of Science and Technology, Korea
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45
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Chae S. Controlling the judge variable in grading essay-type items: an application of Rasch analyses to the recruitment exam for Korean public school teachers. J Outcome Meas 1998; 2:123-41. [PMID: 9661735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The purpose of this paper is to show how the Rasch measurement model can be used to control the effects of judge variable on the grading of essay-type items in the recruitment test for Korean teachers. Special attention is given to two aspects of judges' involvement in the grading. One is to identify a way to minimize the variation of grading due to judge severity. The other concern is to figure out a way to reduce the number of judges without threatening objectivity of ability estimates. Results from the FACETS analyses tell us not only how much grading standards vary among judges and how to adjust them but also it produces comparably reliable ability estimates with fewer judges.
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Affiliation(s)
- S Chae
- Korea Institute of Curriculum & Evaluation, Seoul, Korea
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46
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Abstract
A cDNA encoding elongation factor-1 beta (DdEF-1 beta) for protein synthesis was isolated from Dictyostlium discoideum cells by the differential display (DD) method. The DdEF-1 beta cDNA sequence with a length of 733 bp encodes a protein (M(r) 24.1 kDa) consisting of 214 amino acids. Comparison of the predicted amino acid sequence revealed relatively high homology to that of DdEF-1 beta from silkworm (59%), human (57%) and Xenopus (55%). Northern analysis showed that the DdEF-1 beta mRNA is maximally expressed during the vegetative growth phase, followed by marked decrease in response to cell differentiation induced by starvation.
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Affiliation(s)
- S Chae
- Biological Institute, Graduate School of Science, Tohoku University, Sendai, Japan
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47
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Abstract
Some characteristics of vertical optokinetic nystagmus and after-nystagmus, in particular, its up/down gain asymmetry, are known to be influenced by gravity direction, which is basically perceived by otolith organs. However, how such an information of gravity direction is processed within the central nervous system is not well understood, even though the role of cerebellar uvula and nodulus in vertical eye movements has been identified for some time. Accordingly, in this study, vertical optokinetic nystagmus and after-nystagmus were studied in squirrel monkeys both in the upright and side-lateral positions (different gravity direction to the head), before and after uvulonodulectomy. When the optokinetic stimulus was given, the slow phase eye velocity of optokinetic nystagmus was significantly higher in the side-lateral position than that obtained in the upright position. This difference disappeared after uvulonodulectomy. When the initial slow phase eye velocity of optokinetic after-nystagmus was compared, the one obtained in the side-lateral position was significantly higher than that acquired in the upright position. This difference also disappeared after the uvulonodular ablation. Thus, in this study of vertical optokinetic nystagmus and after-nystagmus, the role of uvula and nodulus in relaying the information of gravity direction was confirmed.
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Affiliation(s)
- M Igarashi
- University Research Center, Nihon University, Tokyo, Japan
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48
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Philpott KL, Viney JL, Kay G, Rastan S, Gardiner EM, Chae S, Hayday AC, Owen MJ. Lymphoid development in mice congenitally lacking T cell receptor alpha beta-expressing cells. Science 1992; 256:1448-52. [PMID: 1604321 DOI: 10.1126/science.1604321] [Citation(s) in RCA: 285] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Vertebrate T cells express either an alpha beta or gamma delta T cell receptor (TCR). The developmental relatedness of the two cell types is unresolved. alpha beta + T cells respond to specific pathogens by collaborating with immunoglobulin-producing B cells in distinct lymphoid organs such as the spleen and Peyer's patches. The precise influence of alpha beta + T cells on B cell development is poorly understood. To investigate the developmental effects of alpha beta + T cells on B cells and gamma delta + T cells, mice homozygous for a disrupted TCR alpha gene were generated. The homozygotes showed elimination of alpha beta + T cells and the loss of thymic medullae. Despite this, gamma delta + T cells developed in normal numbers, and there was an increase in splenic B cells.
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Affiliation(s)
- K L Philpott
- Imperial Cancer Research Fund, London, United Kingdom
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49
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Chae S, Igarashi M, Kim BW. Compensation of vertical vestibulo-ocular functions in squirrel monkeys after unilateral labyrinthectomy. Am J Otolaryngol 1990; 11:170-3. [PMID: 2382784 DOI: 10.1016/0196-0709(90)90033-r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Modifications in the vertical vestibulo-ocular reflex (VVOR) were studied in four squirrel monkeys (Saimiri sciureus) over time after unilateral labyrinthectomy. In the dark, with head upright, animals were exposed to sinusoidal rotation in the pitch plane. The magnetic field-pericorneal search coli technique was used to detect eye movement. The upward and downward slow-phase eye velocity (SPEV) of the VVOR and the maximum SPEV of the vertical component of spontaneous nystagmus (SPN) were studied. The mean preoperative gain of VVOR was symmetric. After unilateral labyrinthectomy, the maximum reduction of VVOR gain showed an asymmetry. The recovery of VVOR gain to the preoperative level took about 2 weeks, and the vertical component of SPN was present for about 3 weeks.
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Affiliation(s)
- S Chae
- Department of Otorhinolaryngology and Communicative Sciences, Baylor College of Medicine, Houston, TX
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50
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Abstract
To assess the dynamic changes of the autonomic neural responses evoked by vestibular-visual conflict (VVC) in the squirrel monkey, we analyzed the changes of salivary amount and sodium concentration, and the coefficient of variance (CV) of R-R intervals (RRI) along the time course of VVC exposure given in pitch plane. The sodium concentration and the amount of saliva showed clear increases at the first and second 15 min stimulation periods. The CV of RRI was found to increase over the entire periods of stimulation, and there was a significant difference between the rest value and those in stimulated periods. The correlation between the CV of RRI, and amount of salivation was highly positive. These results indicate the existence of a common pattern of autonomic neural response during VVC, and suggest usefulness of these indexes for objectively monitoring the severity of motion sickness.
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Affiliation(s)
- M Igarashi
- Department of Otorhinolaryngology and Communicative Sciences, Baylor College of Medicine, Houston, Texas 77030
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