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Bae J, Yoo C, Kim S, Ahn J, Sim HH, Kim JH, Kim JH, Yoon SY, Kim JT, Seol SK, Pyo J. Three-Dimensional Printing of Structural Color Using a Femtoliter Meniscus. ACS Nano 2023. [PMID: 37294876 DOI: 10.1021/acsnano.3c02236] [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: 06/11/2023]
Abstract
Structural colors are produced by the diffraction of light from microstructures. The collective arrangement of substructures is a simple and cost-effective approach for structural coloration represented by colloidal self-assembly. Nanofabrication methods enable precise and flexible coloration by processing individual nanostructures, but these methods are expensive or complex. Direct integration of desired structural coloration remains difficult because of the limited resolution, material-specificity, or complexity. Here, we demonstrate three-dimensional printing of structural colors by direct writing of nanowire gratings using a femtoliter meniscus of polymer ink. This method combines a simple process, desired coloration, and direct integration at a low cost. Precise and flexible coloration is demonstrated by printing the desired structural colors and shapes. In addition, alignment-resolved selective reflection is shown for displayed image control and color synthesis. The direct integration facilitates structural coloration on various substrates, including quartz, silicon, platinum, gold, and flexible polymer films. We expect that our contribution can expand the utility of diffraction gratings across various disciplines such as surface-integrated strain sensors, transparent reflective displays, fiber-integrated spectrometers, anticounterfeiting, biological assays, and environmental sensors.
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Affiliation(s)
- Jongcheon Bae
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Chanbin Yoo
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
| | - Seonghyeon Kim
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Jinhyuck Ahn
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
| | - Ho Hyung Sim
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
| | - Je Hyeong Kim
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
| | - Jung Hyun Kim
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Ji Tae Kim
- Department of Mechanical Engineering, The University of Hong Kong, Hong Kong 999077, China
| | - Seung Kwon Seol
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
| | - Jaeyeon Pyo
- Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
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Han S, Jung H, Jung HJ, Hwang BK, Park IP, Kim SZ, Yun DH, Yoon SY, Heo SW. Optical Manipulation of Incident Light for Enhanced Photon Absorption in Ultrathin Organic Photovoltaics. Nanomaterials (Basel) 2022; 12:3996. [PMID: 36432282 PMCID: PMC9696273 DOI: 10.3390/nano12223996] [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] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/11/2022] [Accepted: 11/12/2022] [Indexed: 06/16/2023]
Abstract
We attempted to improve the photon absorption of the photoactive layer in organic photovoltaic (OPV) devices by device engineering without changing their thickness. Soft nanoimprinting lithography was used to introduce a 1D grating pattern into the photoactive layer. The increase in photocurrent caused by the propagating surface plasmon-polariton mode was quantitatively analyzed by measuring the external quantum efficiency in transverse magnetic and transverse electric modes. In addition, the introduction of an ultrathin substrate with a refractive index of 1.34 improved photon absorption by overcoming the mismatched optical impedance at the air/substrate interface. As a result, the power conversion efficiency (PCE) of an ultrathin OPV with a 400 nm grating period was 8.34%, which was 11.6% higher than that of an unpatterned ultrathin OPV, and the PCE was 3.2 times higher at a low incident light angle of 80°, indicating very low incident light angle dependence.
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Affiliation(s)
- Seungyeon Han
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
- Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Hyunsung Jung
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
| | - Hyeon Jin Jung
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
| | - Bu Kyeong Hwang
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
| | - In Pyo Park
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
| | - Su Zi Kim
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
| | - Dea-Hee Yun
- Resetcompany Co., Ltd., Dallaenae-ro, Sujeong-gu, Seongnam-si 13449, Gyeonggi-do, Korea
| | - Seog-Young Yoon
- Department of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Soo Won Heo
- Nano Convergence Materials Center, Emerging Materials R&D Division, Korea Institute of Ceramic Engineering and Technology (KICET), 101 Soho-ro, Jinju-si 52851, Gyeongsangnam-do, Korea
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Yoo KH, Kim Y, Kim YI, Bae MK, Yoon SY. Lithium doped biphasic calcium phosphate: Structural analysis and osteo/odontogenic potential in vitro. Front Bioeng Biotechnol 2022; 10:993126. [PMID: 36425651 PMCID: PMC9679216 DOI: 10.3389/fbioe.2022.993126] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 10/28/2022] [Indexed: 10/13/2023] Open
Abstract
Biphasic calcium phosphate (BCP) is generally considered a good synthetic bone graft material with osteoinductive potential. Lithium ions are trace elements that play a role in the bone-remodeling process. This study aimed to investigate the effects of lithium ions on the phase, crystal structure, and biological responses of lithium doped BCPs and to identify improvements in their osteogenic properties. Lithium-doped BCP powders with different doping levels (0, 5, 10, and 20 at%) were synthesized via the co-precipitation method. We found that the four types of lithium-doped BCP powders showed different phase compositions of hydroxyapatite and β-tricalcium phosphate. In addition, lithium ions favored entering the β-tricalcium phosphate structure at the Ca (4) sites and calcium vacancy sites [VCa(4)] up to 10 at%. This substitution improves the crystal stabilization by filling the vacancies with Ca2+ and Li+ in all Ca sites. However, when the concentration of Li ions was higher than 10 at%, lithium-induced crystal instability resulted in the burst release of lithium ions, and the osteogenic behavior of human dental pulp stem cells did not improve further. Although lithium ions regulate osteogenic properties, it is important to determine the optimal amount of lithium in BCPs. In this study, the most effective lithium doping level in BCP was approximately 10 at% to improve its biological properties and facilitate medical applications.
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Affiliation(s)
- Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
| | - Yeon Kim
- Department of Oral Physiology, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan, South Korea
| | - Moon-Kyoung Bae
- Department of Oral Physiology, School of Dentistry, Pusan National University, Yangsan, South Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
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Kim H, Yoo KH, Yoon SY, Choi YK, Kim YI. A remineralizing orthodontic etchant that utilizes calcium phosphate ion clusters. Front Bioeng Biotechnol 2022; 10:944869. [PMID: 36118566 PMCID: PMC9473508 DOI: 10.3389/fbioe.2022.944869] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 07/20/2022] [Indexed: 11/13/2022] Open
Abstract
This study aimed to investigate whether a phosphoric acid (H3PO4) solution containing calcium phosphate ion clusters (CPICs) could minimize enamel damage during long-term bracket bonding by dissolving the enamel surface and promoting enamel remineralization. The experimental design is as follows: first, three experimental etchants (H3PO4, CPICs-incorporated H3PO4 solution-I, and CPICs-incorporated H3PO4 solution-II) and two bonding resins (conventional orthodontic resin and self-adhesive orthodontic resin) were used in combination to create six groups, respectively. Each of these six groups was then divided into two sub-groups based on the presence or absence of thermocycling (TC). Twenty samples were assigned to each of the 12 groups (independent variables), and thus a total of 240 metal bracket-attached human premolars were used in this experiment. Bracket debonding was performed on each of 20 premolars in 12 groups, and shear bond strength (SBS) and adhesive remnant index (ARI) values were measured as dependent variables. Next, the three experimental etchants were applied (independent variables) to each of the three enamel samples, and the remineralization of the enamel surface was investigated as a dependent variable. The enamel surface was observed using electron scanning and atomic force microscopy. Furthermore, X-ray diffraction, energy dispersive spectroscopy (EDX) spectrum X-ray spectroscopy, and elemental mapping were performed, and the Knoop microhardness scale was measured. Therefore, the experiment was performed in two steps: SBS and ARI measurements for 12 groups, followed by observation of the enamel surface and microhardness measurements, according to the three types of etchants. As a result of the experiment, first, when the bracket was debonded, SBS did not decrease, and residual adhesive was hardly observed in the C2A group (before TC), C2A, and C1C groups (after TC) (p < 0.001). Second, the experimental etchant containing CPICs achieved remineralization while demineralizing the enamel. This was verified through SEM/EDX, element mapping, XRD, and AFM. Also, the roughness and microhardness of the enamel surface were better in the remineralized surface by the experimental etchant containing CPICs (p < 0.017). The CPICs-incorporated H3PO4 solution reduced ARI while maintaining SBS during bracket debonding, regardless of whether TC was performed or the type of resin. The etchant containing CPICs was also shown to remineralize the enamel and increase its microhardness.
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Affiliation(s)
- Hyeryeong Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, South Korea
| | - Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
| | - Youn-Kyung Choi
- Department of Orthodontics, Biomedical Research Institute, Pusan National University Hospital, Busan, South Korea
- *Correspondence: Youn-Kyung Choi, ; Yong-Il Kim,
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, South Korea
- Dental and Life Science Institute, School of Dentistry, Pusan National University, Yangsan, South Korea
- *Correspondence: Youn-Kyung Choi, ; Yong-Il Kim,
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Jo HS, Kim H, Yoon SY. Synthesis and Characterization of Mesoporous Aluminum Silicate and Its Adsorption for Pb (II) Ions and Methylene Blue in Aqueous Solution. Materials (Basel) 2022; 15:ma15103562. [PMID: 35629587 PMCID: PMC9143537 DOI: 10.3390/ma15103562] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 05/06/2022] [Accepted: 05/13/2022] [Indexed: 11/16/2022]
Abstract
Aluminum silicate powder was prepared using two different syntheses: (1) co-precipitation and (2) two-step sol-gel method. All synthesized powders were characterized by various techniques including XRD, FE-SEM, FT-IR, BET, porosimeter, and zetasizer. The particle morphology of the synthesized aluminum silicate powder was greatly different depending on the synthesis. The synthesized aluminum silicate powder by co-precipitation had a low specific surface area (158 m2/g) and the particle appeared to have a sharp edge, as though in a glassy state. On the other hand, synthesized aluminum silicate powder by the two-step sol-gel method had a mesoporous structure and a large specific surface area (430 m2/g). The aluminum silicate powders as adsorbents were characterized for their adsorption behavior towards Pb (II) ions and methylene blue in an aqueous solution performed in a batch adsorption experiment. The maximum adsorption capacities of Pb (II) ions and methylene blue onto the two-step sol-gel method powder were over four-times and seven-times higher than that of the co-precipitation powder, respectively. These results show that the aluminum silicate powder synthesized with a two-step sol-gel method using ammonia can be a potential adsorbent for removing heavy metal ions and organic dyes from an aqueous solution.
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Choi A, Yoo KH, Yoon SY, Park SB, Choi YK, Kim YI. Enhanced antimicrobial and remineralizing properties of self-adhesive orthodontic resin containing mesoporous bioactive glass and zwitterionic material. J Dent Sci 2022; 17:848-855. [PMID: 35756757 PMCID: PMC9201928 DOI: 10.1016/j.jds.2021.09.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/18/2021] [Indexed: 11/24/2022] Open
Abstract
Abstract Background/purpose Self-adhesive resins (SARs) do not require additional restorative adhesives and provide adequate adhesion to mineralized dental structures by shortening the bonding time in clinics where moisture control and isolation are difficult. The aim of this study was to evaluate the mechanical and biological properties of SARs containing mesoporous bioactive glass nanoparticles (MBNs) and 2-methacryloyloxyethyl phosphorylcholine (MPC) and to determine their antibacterial and remineralization effects. Materials and methods MBNs and MPC were added to SARs to improve their physical properties and remineralization ability. The experimental resins assessed in this study were SARs mixed with 3%MPC, 5%MPC, 1%MBN+3%MPC, or 3%MBN+3%MPC. The shear bond strength, microhardness, adhesive remnant index, ion dissolution, degree of conversion, and antibacterial properties of the SARs were evaluated. To assess the remineralization properties, micro-computed tomography analysis was performed after pH cycling. Results Increasing the MBN content in SAR resulted in higher microhardness compared to the control SAR. The shear bond strength decreased in the SAR+5%MPC group and increased in the SAR+1%MBN+3%MPC and SAR+3%MBN+5%MPC groups. Conclusion Our findings suggest that SARs containing MBNs and MPC have antibacterial and remineralization effects on the enamel.
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Narayan VP, Yoon SY. Associations of Blood Caffeine and Genetically Predicted Coffee Consumption with Anthropometric Measures of Obesity: A Two Sample Mendelian Randomization Study. J Nutr Health Aging 2022; 26:190-196. [PMID: 35166314 DOI: 10.1007/s12603-022-1736-5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES In observational studies, caffeine has been associated with a lower risk of obesity. However, whether the associations are causal and apply to coffee, which is a mixture of chemical compounds is unclear. DESIGN Two sample Mendelian randomization study. SETTING AND PARTICIPANTS Genetic instruments predicting caffeine were extracted from an existing GWAS of serum metabolites in 1960 individuals of European descent. For coffee consumption up to 91,462 individuals of European ancestry with top SNPs followed-up in ~30,062 coffee consumers and up to 375,833 individuals of European ancestry were taken from two separate studies. Genetic associations with obesity classes (n= 263,407), waist-to-hip ratio (WHR) (n=210,086), waist circumference (WC) (n= 231,355), and hip circumference (HC) (n=211,117) were obtained from summary statistics of individuals of European ancestry from the Genetic Investigation of Anthropocentric Traits (GIANT). METHODS The inverse-variance weighted method (IVW) was used as the main analysis. We also employed the weighted median approach (WM) and MR-Egger regression as sensitivity analyses. To gauge evidence of directional pleiotropy, we used Cochrane's Q test, and MR-PRESSO global test, as measures of heterogeneity between ratio estimates of variants. RESULTS There was little evidence to support an association between blood caffeine and any anthropometric measure of obesity in the primary and sensitivity analyses. However, genetically predicted coffee consumption was positively associated with higher class I obesity and WHR. Furthermore, this association was maintained after correction for multiple testing (P < 0.05/6 = 0.008). Results from the GWAS of coffee consumption were in tandem with results from the GWMA, but associations with class I obesity and waist to hip ratio (WHR) were not maintained after correction for multiple testing. CONCLUSION We found little evidence that caffeine or coffee consumption protects against obesity, adding to growing literature suggesting that previous observational studies may have been confounded. This study demonstrates the dangers of ignoring genetic testing for targeted interventions and basing dietary policy recommendations solely on observational studies restricted to specific populations.
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Affiliation(s)
- V P Narayan
- Mr. Vikram Narayan, School of Biological Sciences, The University of Queensland, St Lucia, 4072, Australia, E-mail:
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Ku N, Cheon J, Lee K, Jung Y, Yoon SY, Kim T. Hydrophilic and Conductive Carbon Nanotube Fibers for High-Performance Lithium-Ion Batteries. Materials (Basel) 2021; 14:ma14247822. [PMID: 34947416 PMCID: PMC8707104 DOI: 10.3390/ma14247822] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/12/2021] [Accepted: 12/16/2021] [Indexed: 11/16/2022]
Abstract
Carbon nanotube fiber (CNTF) is a highly conductive and porous platform to grow active materials of lithium-ion batteries (LIB). Here, we prepared SnO2@CNTF based on sulfonic acid-functionalized CNTF to be used in LIB anodes without binder, conductive agent, and current collector. The SnO2 nanoparticles were grown on the CNTF in an aqueous system without a hydrothermal method. The functionalized CNTF exhibited higher conductivity and effective water infiltration compared to the raw CNTF. Due to the enhanced water infiltration, the functionalized CNTF became SnO2@CNTF with an ideal core-shell structure coated with a thin SnO2 layer. The specific capacity and rate capability of SnO2@-functionalized CNTF were superior to those of SnO2@raw CNTF. Since the SnO2@CNTF-based anode was free of a binder, conductive agent, and current collector, the specific capacity of the anode studied in this work was higher than that of conventional anodes.
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Affiliation(s)
- Nayoung Ku
- Composites Research Division, Korea Institute of Materials Science, Changwon 51508, Korea; (N.K.); (J.C.); (K.L.); (Y.J.)
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
| | - Jaeyeong Cheon
- Composites Research Division, Korea Institute of Materials Science, Changwon 51508, Korea; (N.K.); (J.C.); (K.L.); (Y.J.)
| | - Kyunbae Lee
- Composites Research Division, Korea Institute of Materials Science, Changwon 51508, Korea; (N.K.); (J.C.); (K.L.); (Y.J.)
| | - Yeonsu Jung
- Composites Research Division, Korea Institute of Materials Science, Changwon 51508, Korea; (N.K.); (J.C.); (K.L.); (Y.J.)
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
- Correspondence: (S.-Y.Y.); (T.K.)
| | - Taehoon Kim
- Composites Research Division, Korea Institute of Materials Science, Changwon 51508, Korea; (N.K.); (J.C.); (K.L.); (Y.J.)
- Correspondence: (S.-Y.Y.); (T.K.)
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Yoo KH, Kim YI, Yoon SY. Physicochemical and Biological Properties of Mg-Doped Calcium Silicate Endodontic Cement. Materials (Basel) 2021; 14:1843. [PMID: 33917786 PMCID: PMC8068188 DOI: 10.3390/ma14081843] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/01/2021] [Accepted: 04/01/2021] [Indexed: 12/31/2022]
Abstract
Calcium silicate-based cement has been widely used for endodontic repair. However, it has a long setting time and needs to shorten setting time. This study investigated the effects of magnesium (Mg) ion on the setting reaction, mechanical properties, and biological properties of calcium silicate cement (CSC). Sol-gel route was used to synthesize Mg ion-doped calcium silicate cement. Synthesized cement was formulated with the addition of different contents of Mg ion, according to 0, 1, 3, 5 mol% of Mg ion-doped calcium silicate. The synthesized cements were characterized with X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM). We also evaluated the physicochemical and biological properties of cement, such as the setting time, compressive strength, micro-hardness, simulated body fluid (SBF) immersion, cytotoxicity, and cell differentiation tests. As a result, the Mg ion improves the hydration properties of calcium silicate cement, and the setting time is reduced by increasing the amounts of Mg ion. However, the mechanical properties deteriorated with increasing Mg ion, and 1 and 3 mol% Mg-doped calcium silicate had appropriate mechanical properties. Also, the results of biological properties such as cytotoxicity, ALP activity, and ARS staining improved with Mg ion. Consequently, the optimal condition is 3 mol% of Mg ion-doped calcium silicate (3%Mg-CSC).
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Affiliation(s)
- Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea;
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan 50612, Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea;
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Choi Y, Sun W, Kim Y, Kim IR, Gong MK, Yoon SY, Bae MK, Park BS, Park SB, Kim YI. Effects of Zn-Doped Mesoporous Bioactive Glass Nanoparticles in Etch-and-Rinse Adhesive on the Microtensile Bond Strength. Nanomaterials (Basel) 2020; 10:nano10101943. [PMID: 33003534 PMCID: PMC7601785 DOI: 10.3390/nano10101943] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 09/17/2020] [Accepted: 09/28/2020] [Indexed: 01/05/2023]
Abstract
The purpose of this study was to assess the effects in the dentin bond strength of dental adhesives (DAs) and biological effects using zinc (Zn)-doped mesoporous bioactive glass nanoparticles (MBN-Zn). Synthesized MBN and MBN-Zn were characterized by scanning electron microscopy (SEM), X-ray diffraction and the Brunauer, Emmett and Teller (BET) method. The matrix metalloproteinases (MMP) inhibition effects of DA-MBN and DA-MBN-Zn were analyzed. The microtensile bond strength (MTBS) test was conducted before and after thermocycling to investigate the effects of MBN and MBN-Zn on the MTBS of DAs. The biological properties of DA-MBN and DA-MBN-Zn were analyzed with human dental pulp stem cells (hDPSCs). Compared with the DA, only the DA-1.0% MBN and DA-1.0% MBN-Zn exhibited a statistically significant decrease in MMP activity. The MTBS values after thermocycling were significantly increased in DA-1.0% MBN and DA-1.0% MBN-Zn compared with the DA (p < 0.05). It was confirmed via the MTT assay that there was no cytotoxicity for hDPSCs at 50% extract. In addition, significant increases in the alkaline phosphatase activity and Alizarin Red S staining were observed only in DA-1.0%MBN-Zn. These data suggest the 1.0% MBN and 1.0% MBN-Zn enhance the remineralization capability of DAs and stabilize the long-term MTBS of DAs by inhibiting MMPs.
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Affiliation(s)
- Yeonju Choi
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan 50612, Korea; (Y.C.); (M.-K.G.); (S.-B.P.)
| | - Woogyeong Sun
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea; (W.S.); (S.-Y.Y.)
| | - Yeon Kim
- Department of Oral Physiology, School of Dentistry, Pusan National University, Yangsan 50612, Korea; (Y.K.); (M.-K.B.)
| | - In-Ryoung Kim
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Yangsan 50612, Korea; (I.-R.K.); (B.-S.P.)
| | - Mi-Kyung Gong
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan 50612, Korea; (Y.C.); (M.-K.G.); (S.-B.P.)
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea; (W.S.); (S.-Y.Y.)
| | - Moon-Kyoung Bae
- Department of Oral Physiology, School of Dentistry, Pusan National University, Yangsan 50612, Korea; (Y.K.); (M.-K.B.)
| | - Bong-Soo Park
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Yangsan 50612, Korea; (I.-R.K.); (B.-S.P.)
| | - Soo-Byung Park
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan 50612, Korea; (Y.C.); (M.-K.G.); (S.-B.P.)
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan 50612, Korea; (Y.C.); (M.-K.G.); (S.-B.P.)
- Dental and Life Science Institute, Pusan National University, Yangsan 50612, Korea
- Correspondence: ; Tel.: +82-55-360-5163
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Abstract
The pixel is the minimum unit used to represent or record information in photonic devices. The size of the pixel determines the density of the integrated information, such as the resolution of displays or cameras. Most methods used to produce display pixels are based on two-dimensional patterning of light-emitting materials. However, the brightness of the pixels is limited when they are miniaturized to nanoscale dimensions owing to their limited volume. Herein, we demonstrate the production of three-dimensional (3D) pixels with nanoscale dimensions based on the 3D printing of quantum dots embedded in polymer nanowires. In particular, a femtoliter meniscus was used to guide the solidification of liquid inks to form vertically freestanding nanopillar structures. Based on the 3D layout, we show high-density integration of color pixels, with a lateral dimension of 620 nm and a pitch of 3 μm for each of the red, green, and blue colors. The 3D structure enabled a 2-fold increase in brightness without significant effects on the spatial resolution of the pixels. In addition, we demonstrate individual control of the brightness based on a simple adjustment of the height of the 3D pixels. This method can be used to achieve super-high-resolution display devices and various photonic applications across a range of disciplines.
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Affiliation(s)
- Jongcheon Bae
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Sanghyeon Lee
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Jinhyuck Ahn
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon, Gyeongsangnam-do 51543, Republic of Korea
| | - Jung Hyun Kim
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon, Gyeongsangnam-do 51543, Republic of Korea
| | - Muhammad Wajahat
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon, Gyeongsangnam-do 51543, Republic of Korea
| | - Won Suk Chang
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Ji Tae Kim
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Seung Kwon Seol
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
- Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon, Gyeongsangnam-do 51543, Republic of Korea
| | - Jaeyeon Pyo
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI), Changwon, Gyeongsangnam-do 51543, Republic of Korea
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Son SA, Kim DH, Yoo KH, Yoon SY, Kim YI. Mesoporous Bioactive Glass Combined with Graphene Oxide Quantum Dot as a New Material for a New Treatment Option for Dentin Hypersensitivity. Nanomaterials (Basel) 2020; 10:nano10040621. [PMID: 32230884 PMCID: PMC7221916 DOI: 10.3390/nano10040621] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 03/25/2020] [Accepted: 03/26/2020] [Indexed: 11/16/2022]
Abstract
Dentin hypersensitivity is one of the most common clinical conditions usually associated with exposed dentinal tubules. The purpose of this study was to identify the potential of a graphene oxide quantum dot coating for mesoporous bioactive glass nanoparticles as a new material for the treatment of dentin hypersensitivity by investigating its mineralization activity and dentinal tubules sealing. Mesoporous bioactive glass nanoparticle was fabricated by modified sol-gel synthesis. X-ray diffraction was performed to characterize the synthesized nanoparticle Fourier transform infra-red spectroscopy investigated the functionalized surfaces. The distribution of the specific surface area and the pore size was measure by Pore size analysis. The morphology of sample was observed by Field Emission Scanning Electron Microscope (FESEM) and Field Emission Transmission Electron Microscope (FETEM). After disk-shaped specimens of mesoporous bioactive glass nanoparticles and graphene oxide quantum dot coated mesoporous bioactive glass nanoparticles (n = 3) were soaked in the simulated body fluid for 0, 1, 5, 10,and 30 days, the amount of ions released was observed to confirm the ionic elution for mineralization. Sensitive tooth model discs (n = 20) were applied with two samples and evaluated the dentinal tubule sealing ability. The spherical mesoporous bioactive glass nanoparticles and graphene oxide quantum dot coated mesoporous bioactive glass nanoparticles with a diameter of about 500 nm were identified through FESEM and FETEM. The ion release capacity of both samples appeared to be very similar. The amount of ion released and in vitro mineralization tests confirmed that graphene oxide quantum dot coating of mesoporous bioactive glass nanoparticles did not inhibit the release of calcium, silicon and phosphate ions, but rather that graphene oxide quantum dot promoted hydroxyapatite formation. In the FESEM image of the sensitive tooth disc surface, it was observed that graphene oxide quantum dot coated mesoporous bioactive glass nanoparticles sealed tightly the dentinal tubules. The graphene oxide quantum dot coating of mesoporous bioactive glass nanoparticles not only showed the excellent dentinal sealing ability but also rapidly promoted mineralization while minimizing the size increase by coating the mesoporous bioactive glass nanoparticles.
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Affiliation(s)
- Sung-Ae Son
- Department of Conservative Dentistry, Dental Research Institute, Pusan National University, Yangsan 50612, Korea
| | - Dong-Hyun Kim
- R&D Center, DAEWON MATERIALS Co., Ltd., 365, Sinseon-ro, Nam-gu, Busan, 48561, Korea;
| | - Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea; (K.-H.Y.); (S.-Y.Y.)
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea; (K.-H.Y.); (S.-Y.Y.)
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University, Yangsan 50612, Korea
- Dental and Life Science Institute, Pusan National University, Yangsan 50612, Korea
- Correspondence: ; Tel.: +82-55-360-5163
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Lee SH, Hosseindoust A, Laxman Ingale S, Rathi PC, Yoon SY, Choi JW, Kim JS. Thermostable xylanase derived from Trichoderma citrinoviride increases growth performance and non-starch polysaccharide degradation in broiler chickens. Br Poult Sci 2019; 61:57-62. [PMID: 31559842 DOI: 10.1080/00071668.2019.1673316] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 12/18/2022]
Abstract
1. The aim of this trial was to determine the optimal supplementation level of a xylanase enzyme from Trichoderma citrinoviride on growth performance, apparent ileal and total tract nutrient retention, intestinal morphology, and intestinal concentration of volatile fatty acids in broiler chickens.2. A total of 600 broiler chickens (Ross 308) of mixed sex were randomly allotted to four treatments, on the basis of similar body weight. The dietary treatments were made from a corn-wheat-soy based diet supplemented with either 0, 3750, 7500, or 11 250 XU/kg xylanase and were fed to 32 d of age.3. A linear response to increasing dietary xylanase was demonstrated for overall weight gain (P < 0.05) and feed conversion ratio (P < 0.05). The apparent total tract digestibility of dry matter and gross energy, and the coefficient of apparent ileal digestibility (CIAD) of N and soluble non-starch polysaccharides were linearly improved when xylanase was added to the diet (P < 0.05). Moreover, a linear increase (P < 0.05) was observed in the CIAD of Arg, Lys, and Try with increasing dietary levels of xylanase.4. The viscosity of digesta in ileum was linearly decreased when dietary xylanase level increased (P < 0.05).5. An increase in villus height of the duodenum and jejunum were observed with increasing dietary levels of xylanase (linear, P < 0.05).6. Overall, the results showed that the effects of dietary xylanase supplementation on broiler performance was determined through effects on nutrient availability and intestinal morphology.
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Affiliation(s)
- S H Lee
- Department of Swine Science, Korea National College of Agriculture and Fisheries, Jeonju, Republic of Korea
| | - A Hosseindoust
- Department of Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
| | | | - P C Rathi
- Advanced Enzyme Technologies Ltd., Thane, India
| | - S Y Yoon
- Department of Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
| | - J W Choi
- Department of Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
| | - J S Kim
- Department of Animal Life Science, Kangwon National University, Chuncheon, Republic of Korea
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Nam HJ, Kim YM, Kwon YH, Yoo KH, Yoon SY, Kim IR, Park BS, Son WS, Lee SM, Kim YI. Fluorinated Bioactive Glass Nanoparticles: Enamel Demineralization Prevention and Antibacterial Effect of Orthodontic Bonding Resin. Materials (Basel) 2019; 12:ma12111813. [PMID: 31167432 PMCID: PMC6600697 DOI: 10.3390/ma12111813] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 06/02/2019] [Accepted: 06/03/2019] [Indexed: 12/27/2022]
Abstract
Orthodontic treatment involving the bonding of fixed appliances to tooth surfaces can cause white spot lesions (WSLs). WSLs increase the likelihood of cavity formation and hence require preservation and prosthetic restoration. Therefore, the prevention of WSLs is of greater importance than treatment. Application of fluoride or the use of fluoride-containing mouthwash can prevent WSLs, but this requires patient cooperation and additional time and cost. Bioactive glass containing 2.5% fluoride was synthesized and mixed with the orthodontic bonding adhesive Transbond XT Low Flow (LV) at ratios of 1, 3, and 5% to prepare orthodontic adhesive samples. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the samples. The Vickers hardness test, bracket retention test, and adhesive remnant index (ARI) of the samples were analysed to determine their mechanical properties. To determine the biological cytotoxicity, the cell activity of the samples was evaluated using cell viability tests and the antibacterial activity was analysed using Streptococcus mutans. To evaluate the anti-demineralization effect, the sample was bonded to extracted teeth and a pH cycle test was performed. Micro computed tomography data were obtained from the bonded teeth and sample, and the anti-demineralization effect was evaluated using the ImageJ software program. The Vickers hardness of the sample was higher than that of LV and was dependent on the concentration of fluoride-containing bioactive glass (FBAG). The bracket retention test and ARI of the sample showed no significant differences from those of LV. The cell viability test showed no significant changes at 24 and 48 h after application of the sample. The fluoride ion release test indicated an ion release rate of 9.5–17.4 μg/cm2. The antibacterial activity of the experimental group containing FBAG was significantly higher than that of the LV group. The anti-demineralization test showed a concentration-dependent increase. However, the resin containing 5 mass% FBAG (FBAG5) showed a statistically-significant increase compared with LV. The orthodontic adhesive containing FBAG showed antibacterial and anti-demineralization effects, thus indicating possible WSL prevention activity.
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Affiliation(s)
- Hyung-Jin Nam
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
| | - You-Min Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
| | - Yong Hoon Kwon
- Department of Dental Materials, School of Dentistry, Pusan National University, Yangsan 50612, Korea.
| | - Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea.
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea.
| | - In-Ryoung Kim
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Yangsan 50612, Korea.
| | - Bong-Soo Park
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Yangsan 50612, Korea.
| | - Woo-Sung Son
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
| | - Seung-Min Lee
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
- Institute of Translational Dental Sciences, Pusan National University, Busan 46241, Korea.
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15
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Kim ST, Kang JH, Lee J, Lee HW, Oh SY, Jang JS, Lee MA, Sohn BS, Yoon SY, Choi HJ, Hong JH, Kim MJ, Kim S, Park YS, Park JO, Lim HY. Capecitabine plus oxaliplatin versus gemcitabine plus oxaliplatin as first-line therapy for advanced biliary tract cancers: a multicenter, open-label, randomized, phase III, noninferiority trial. Ann Oncol 2019; 30:788-795. [PMID: 30785198 DOI: 10.1093/annonc/mdz058] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Capecitabine plus oxaliplatin (XELOX) has shown modest activity and tolerable toxicity in a phase II trial for biliary tract cancers (BTCs). Meanwhile, gemcitabine plus oxaliplatin (GEMOX) has been the reference arm in recent phase II and III trials for BTCs. We aimed to investigate the efficacy of XELOX versus GEMOX as first-line therapy for advanced BCTs. PATIENTS AND METHODS In this open-label, randomized, phase III, noninferiority trial, we randomly selected patients with metastatic BCTs to receive GEMOX (gemcitabine 1000 mg/m2 on days 1 and 8, and oxaliplatin 100 mg/m2 on day 1) or XELOX (capecitabine 1000 mg/m2, twice daily, on days 1-14 and oxaliplatin 130 mg/m2 on day 1) as first-line treatment, given every 3 weeks, totaling eight cycles. The primary end point was to prove the noninferiority of XELOX to GEMOX in terms of 6-month progression-free survival (PFS) rate. RESULTS In total, 114 patients randomly received GEMOX and 108 randomly received XELOX. The median PFS was 5.3 months for the GEMOX group and 5.8 months for the XELOX group. The 6-month PFS rate was 44.5% for the GEMOX group and 46.7% for the XELOX group. The 95% confidence interval of the 6-month PFS rate difference between both groups was -12% to 16%, meeting the criteria for noninferiority of XELOX to GEMOX. There was no difference in objective response (P=0.171) and median overall survival (P=0.131) between both groups. The most common grade three to four adverse events were neutropenia and thrombocytopenia. No patient died of treatment-related causes. The XELOX group had significantly lower frequencies of hospital visits than the GEMOX group (P<0.001). CONCLUSION XELOX showed significant noninferiority to GEMOX in terms of 6-month PFS rate. Thus, XELOX could be an alternative first-line treatment of BCTs. TRIAL REGISTRATION This study was registered in ClinicalTrials.gov (number NCT01470443).
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Affiliation(s)
- S T Kim
- Division of Hemato-oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul
| | - J H Kang
- Division of Hemato-oncology, Department of Medicine, Gyeongsang National University Hospital, Jinju
| | - J Lee
- Division of Hemato-oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul
| | - H W Lee
- Division of Hemato-oncology, Department of Medicine, Ajou University School of Medicine, Suwon
| | - S Y Oh
- Division of Hemato-oncology, Department of Medicine, Dong-A University School of Medicine, Busan
| | - J S Jang
- Division of Hemato-oncology, Department of Medicine, Chung-Ang University College of Medicine, Seoul
| | - M A Lee
- Division of Hemato-oncology, Department of Medicine, Seoul St Mary's Hospital, Catholic University, Seoul
| | - B S Sohn
- Division of Hemato-oncology, Department of Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul
| | - S Y Yoon
- Division of Hemato-oncology, Department of Medicine, Konkuk University Medical Center, Seoul
| | - H J Choi
- Division of Hemato-oncology, Department of Medicine, Yonsei University College of Medicine, Seoul
| | - J H Hong
- Division of Hemato-oncology, Department of Medicine, Incheon St Mary's Hospital, Catholic University, Incheon
| | - M-J Kim
- Statistics and Data Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul, South Korea
| | - S Kim
- Statistics and Data Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul, South Korea
| | - Y S Park
- Division of Hemato-oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul
| | - J O Park
- Division of Hemato-oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul.
| | - H Y Lim
- Division of Hemato-oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul.
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16
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Lee SM, Yoo KH, Yoon SY, Kim IR, Park BS, Son WS, Ko CC, Son SA, Kim YI. Enamel Anti-Demineralization Effect of Orthodontic Adhesive Containing Bioactive Glass and Graphene Oxide: An In-Vitro Study. Materials (Basel) 2018; 11:ma11091728. [PMID: 30223468 PMCID: PMC6163975 DOI: 10.3390/ma11091728] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Revised: 09/12/2018] [Accepted: 09/12/2018] [Indexed: 02/06/2023]
Abstract
White spot lesions (WSLs), a side effect of orthodontic treatment, can result in reversible and unaesthetic results. Graphene oxide (GO) with a bioactive glass (BAG) mixture (BAG@GO) was added to Low-Viscosity Transbond XT (LV) in a ratio of 1, 3, and 5%. The composite’s characterization and its physical and biological properties were verified with scanning electron microscopy (SEM) and X-ray diffraction (XRD); its microhardness, shear bond strength (SBS), cell viability, and adhesive remnant index (ARI) were also assessed. Efficiency in reducing WSL was evaluated using antibacterial activity of S. mutans. Anti-demineralization was analyzed using a cycle of the acid-base solution. Adhesives with 3 wt.% or 5 wt.% of BAG@GO showed significant increase in microhardness compared with LV. The sample and LV groups showed no significant differences in SBS or ARI. The cell viability test confirmed that none of the sample groups showed higher toxicity compared to the LV group. Antibacterial activity was higher in the 48-h group than in the 24 h group; the 48 h test showed that BAG@GO had a high antibacterial effect, which was more pronounced in 5 wt.% of BAG@GO. Anti-demineralization effect was higher in the BAG@GO-group than in the LV-group; the higher the BAG@GO concentration, the higher the anti-demineralization effect.
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Affiliation(s)
- Seung-Min Lee
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
| | - Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea.
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea.
| | - In-Ryoung Kim
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Yangsan 50612, Korea.
| | - Bong-Soo Park
- Department of Oral Anatomy, School of Dentistry, Pusan National University, Yangsan 50612, Korea.
| | - Woo-Sung Son
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
| | - Ching-Chang Ko
- Department of Orthodontics, School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27516, USA.
| | - Sung-Ae Son
- Department of Conservative Dentistry, School of Dentistry, Pusan National University, Yangsan 50612, Korea.
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan 50612, Korea.
- Institute of Translational Dental Sciences, Pusan National University, Busan 46241, Korea.
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17
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Kim YM, Kim DH, Song CW, Yoon SY, Kim SY, Na HS, Chung J, Kim YI, Kwon YH. Antibacterial and remineralization effects of orthodontic bonding agents containing bioactive glass. Korean J Orthod 2018; 48:163-171. [PMID: 29732302 PMCID: PMC5932318 DOI: 10.4041/kjod.2018.48.3.163] [Citation(s) in RCA: 18] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/11/2017] [Accepted: 09/01/2017] [Indexed: 11/18/2022] Open
Abstract
Objective The aim of this study was to evaluate the mechanical and biological properties of orthodontic bonding agents containing silver- or zinc-doped bioactive glass (BAG) and determine the antibacterial and remineralization effects of these agents. Methods BAG was synthesized using the alkali-mediated solgel method. Orthodontic bonding agents containing BAG were prepared by mixing BAG with flowable resin. Transbond™ XT (TXT) and Charmfil™ Flow (CF) were used as controls. Ion release, cytotoxicity, antibacterial properties, the shear bond strength, and the adhesive remnant index were evaluated. To assess the remineralization properties of BAG, micro-computed tomography was performed after pH cycling. Results The BAG-containing bonding agents showed no noticeable cytotoxicity and suppressed bacterial growth. When these bonding agents were used, demineralization after pH cycling began approximately 200 to 300 µm away from the bracket. On the other hand, when CF and TXT were used, all surfaces that were not covered by the adhesive were demineralized after pH cycling. Conclusions Our findings suggest that orthodontic bonding agents containing silver- or zinc-doped BAG have stronger antibacterial and remineralization effects compared with conventional orthodontic adhesives; thus, they are suitable for use in orthodontic practice.
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Affiliation(s)
- You-Min Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Korea
| | | | - Chang Weon Song
- School of Materials Science and Engineering, Pusan National University, Busan, Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan, Korea
| | - Se-Yeon Kim
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Korea
| | - Hee Sam Na
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Korea
| | - Jin Chung
- Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan, Korea
| | - Yong-Il Kim
- Department of Orthodontics, Dental Research Institute, Pusan National University Dental Hospital, Yangsan, Korea.,Institute of Translational Dental Sciences, School of Dentistry, Pusan National University, Yangsan, Korea
| | - Yong Hoon Kwon
- Department of Dental Materials, Pusan National University, Yangsan, Korea
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18
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Yoo KH, Cho HS, Kim DH, Lee JK, Yong-Il K, Hwang KH, Yoon SY. Polylactic Acid/Nanostructured Si-Substituted β-Tricalcium Phosphate Composites for Biodegradable Fixation Medical Devices. J Nanosci Nanotechnol 2018; 18:856-860. [PMID: 29448506 DOI: 10.1166/jnn.2018.14882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Organic/inorganic biocomposite materials for biodegradable fixation medical devices require osteoconductivity, biocompatibility, and adequate mechanical properties with biodegradation behavior. The objective of this study was to investigate the effect of Si ions substituted in β-tricalcium phosphate (β-TCP) on the mechanical properties of organic/inorganic biocomposites. Biodegradable composite materials were prepared with polylactic acid (PLA) as the matrix and nano Si-substituted β-TCP as the osteoconductive filler by solvent mixing and conventional molding. The nanostructured Si-substituted β-TCP powders were synthesized by co-precipitation, controlling the quantity of Si ions. The amount of nanostructured Si-substituted β-TCP powders in composites was varied in the 0-40 wt% range and the material properties were compared with those of pure β-TCP/PLA composites. The influence of Si ions on the mechanical properties of the composites was evaluated by tensile and flexural tests.
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Affiliation(s)
- Kyung-Hyeon Yoo
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
| | - Hoon-Sang Cho
- R&D Center, Upex. Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Dong-Hyun Kim
- R&D Center, Upex. Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Jong Kook Lee
- Department of Advanced Materials Engineering, Chosun University, Gwangju, South Korea
| | - Kim Yong-Il
- Department of Orthodontics, School of Dentistry, Pusan National University, South Korea
| | - Kyu-Hong Hwang
- School of Nano and Advanced Materials, Gyeongsang National University, Jinju 660-701, South Korea
| | - Seog-Young Yoon
- School of Nano and Advanced Materials, Gyeongsang National University, Jinju 660-701, South Korea
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19
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Park J, Kim BJ, Hwang JY, Yoon YW, Cho HS, Kim DH, Lee JK, Yoon SY. In-Vitro Mechanical Performance Study of Biodegradable Polylactic Acid/Hydroxyapatite Nanocomposites for Fixation Medical Devices. J Nanosci Nanotechnol 2018; 18:837-841. [PMID: 29448502 DOI: 10.1166/jnn.2018.14884] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Osteoconductive, biocompatible, and resorbable organic/inorganic composites are most commonly used in fixation medical devices, such as suture anchors and interference screws, because of their unique physical and chemical properties. Generally, studies on biodegradable composites have focused on their mechanical properties based on the composition and the individual roles of organic and inorganic biomaterials. In this study, we prepared biodegradable organic/inorganic nanocomposite materials using the solvent mixing process and conventional molding. We used polylactic acid (PLA) as the matrix and nano-sized hydroxyapatite (nano-HAp) as the osteoconductive filler. The content of nano-HAp was varied in 0-30 wt% and its influence on the In-Vitro mechanical performance of PLA/HAp nanocomposites was evaluated. The In-Vitro mechanical properties of nanocomposites were evaluated using standardized tensile and flexural tests after different immersion times in simulated body fluid.
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Affiliation(s)
- Jinsu Park
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
| | - Bae-Jung Kim
- Research and Development Center, Upex.Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Ji-Yeong Hwang
- Research and Development Center, Upex.Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Yo-Woong Yoon
- Research and Development Center, Upex.Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Hoon-Sang Cho
- Research and Development Center, Upex.Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Dong-Hyun Kim
- Research and Development Center, Upex.Med Co., Ltd., Anyang, Gyeonggi-do, South Korea
| | - Jong Kook Lee
- Department of Advanced Materials Engineering, Chosun University, Gwangju, South Korea
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Busan, South Korea
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Yoon SY, Park TH, Eun NL, Park YG. The cutoff value of ossification of posterior longitudinal ligament (OPLL) for early diagnosis of myelopathy using somatosensory evoked potential in cervical OPLL patients. Spinal Cord 2017; 55:606-611. [PMID: 28220819 DOI: 10.1038/sc.2017.15] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 01/16/2017] [Accepted: 01/16/2017] [Indexed: 11/10/2022]
Abstract
STUDY DESIGN Retrospective study. OBJECTIVES The objective of this study was to find out whether ossification of posterior longitudinal ligament (OPLL) characteristics, including size, shape and subtype, can be used to diagnose myelopathy using somatosensory evoked potential (SEP) in cervical OPLL patients. SETTING Yonsei University College of Medicine, Seoul, Korea. METHODS We retrospectively reviewed the medical records of 153 cervical OPLL patients who underwent SEP study. OPLL anterior-posterior (AP) diameter, area and involved longitudinal vertebral level were measured. OPLL was classified into subtypes according to longitudinal continuity and shape. Correlation analysis and receiver operating curve were used. RESULTS Tibial SEP latency was significantly correlated with OPLL AP diameter (P=0.001), diameter occupying ratio (P=0.019), area (P=0.007), area occupying ratio (P=0.008), involved longitudinal vertebral level (P=0.028) and space available for the spinal cord (P=0.019). The cutoff values that were diagnostic for SEP prolongation suggesting myelopathy were 4.91 mm for OPLL AP diameter, 6.02 mm for space available for the spinal cord, 44.5% for diameter occupying ratio, 63.4 mm2 for area, 36.1% for area occupying ratio and level 2 for the involved longitudinal vertebral level. CONCLUSIONS Our results revealed that tibial SEP latency was significantly correlated with OPLL size and suggested cutoff values of OPLL diameter (4.91 mm, 44.5%) and area (63.4 mm2, 36.1%) for early diagnosis of myelopathy. These results can help to establish treatment plans.
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Affiliation(s)
- S Y Yoon
- Department of Rehabilitation Medicine, Bundang Jesaeng General Hospital, Gyeonggi-do, Republic of Korea
| | - T H Park
- Department of Rehabilitation Medicine and Rehabilitation Institute of Neuromuscular Disease, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - N L Eun
- Department of Radiology and Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Republic of Korea
| | - Y G Park
- Department of Rehabilitation Medicine and Rehabilitation Institute of Neuromuscular Disease, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea
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Jeong N, Kim DH, Cho HS, Yoon SY. Preparation and characterization of silanized-hydroxypropyl methylcellulose/phase transformed calcium phosphate composite bone cements. Journal of the Korean Crystal Growth and Crystal Technology 2016. [DOI: 10.6111/jkcgct.2016.26.6.243] [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: 11/09/2022]
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Kim GY, Sung KD, Rhyim Y, Yoon SY, Kim MS, Jeong SJ, Kim KH, Ryu J, Kim SD, Choi SY. Enhanced polarization by the coherent heterophase interface between polar and non-polar phases. Nanoscale 2016; 8:7443-7448. [PMID: 26601654 DOI: 10.1039/c5nr05391a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A piezoelectric composite containing the ferroelectric polar (Bi(Na0.8K0.2)0.5TiO3: f-BNKT) and the non-polar (0.94Bi(Na0.75K0.25)0.5TiO3-0.06BiAlO3: BNKT-BA) phases exhibits synergetic properties which combine the beneficial aspects of each phase, i.e., the high saturated polarization (Ps) of the polar phase and the low coercive field (Ec) of the non-polar phase. To understand the origin of such a fruitful outcome from this type of polar/non-polar heterophase structure, comprehensive studies are conducted, including transmission electron microscopy (TEM) and finite element method (FEM) analyses. The TEM results show that the polar/non-polar composite has a core/shell structure in which the polar phase (core) is surrounded by a non-polar phase (shell). In situ electrical biasing TEM experiments visualize that the ferroelectric domains in the polar core are aligned even under an electric field of ∼1 kV mm(-1), which is much lower than its intrinsic coercive field (∼3 kV mm(-1)). From the FEM analyses, we can find that the enhanced polarization of the polar phase is promoted by an additional internal field at the phase boundary which originates from the preferential polarization of the relaxor-like non-polar phase. From the present study, we conclude that the coherent interface between polar and non-polar phases is a key factor for understanding the enhanced piezoelectric properties of the composite.
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Affiliation(s)
- Gi-Yeop Kim
- Materials Modeling & Characterization Department, Korea Institute of Materials Science, Changwon 642-831, South Korea. and School of Materials Science and Engineering, Pusan National University, Pusan 609-735, South Korea
| | - Kil-Dong Sung
- Materials Modeling & Characterization Department, Korea Institute of Materials Science, Changwon 642-831, South Korea.
| | - Youngmok Rhyim
- Materials Modeling & Characterization Department, Korea Institute of Materials Science, Changwon 642-831, South Korea.
| | - Seog-Young Yoon
- School of Materials Science and Engineering, Pusan National University, Pusan 609-735, South Korea
| | - Min-Soo Kim
- Battery Research Center, Korea Electrotechnology Research Institute, Changwon 641-120, South Korea
| | - Soon-Jong Jeong
- Battery Research Center, Korea Electrotechnology Research Institute, Changwon 641-120, South Korea
| | - Kwang-Ho Kim
- School of Materials Science and Engineering, Pusan National University, Pusan 609-735, South Korea
| | - Jungho Ryu
- Functional Ceramics Group, Korea Institute of Materials Science, Changwon 642-831, South Korea
| | - Sung-Dae Kim
- Materials Modeling & Characterization Department, Korea Institute of Materials Science, Changwon 642-831, South Korea.
| | - Si-Young Choi
- Materials Modeling & Characterization Department, Korea Institute of Materials Science, Changwon 642-831, South Korea.
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Kwon SG, Roh DH, Yoon SY, Choi SR, Choi HS, Moon JY, Kang SY, Kim HW, Han HJ, Beitz AJ, Oh SB, Lee JH. Role of peripheral sigma-1 receptors in ischaemic pain: Potential interactions with ASIC and P2X receptors. Eur J Pain 2016; 20:594-606. [PMID: 26358747 DOI: 10.1002/ejp.774] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/21/2015] [Indexed: 12/19/2022]
Abstract
BACKGROUND The role of peripheral sigma-1 receptors (Sig-1Rs) in normal nociception and in pathologically induced pain conditions has not been thoroughly investigated. Since there is mounting evidence that Sig-1Rs modulate ischaemia-induced pathological conditions, we investigated the role of Sig-1Rs in ischaemia-induced mechanical allodynia (MA) and addressed their possible interaction with acid-sensing ion channels (ASICs) and P2X receptors at the ischaemic site. METHODS We used a rodent model of hindlimb thrombus-induced ischaemic pain (TIIP) to investigate their role. Western blot was performed to observe changes in Sig-1R expression in peripheral nervous tissues. MA was measured after intraplantar (i.pl.) injections of antagonists for the Sig-1, ASIC and P2X receptors in TIIP rats or agonists of each receptor in naïve rats. RESULTS Sig-1R expression significantly increased in skin, sciatic nerve and dorsal root ganglia at 3 days post-TIIP surgery. I.pl. injections of the Sig-1R antagonist, BD-1047 on post-operative days 0-3 significantly attenuated the development of MA during the induction phase, but had no effect on MA when given during the maintenance phase (days 3-6 post-surgery). BD-1047 synergistically increased amiloride (an ASICs blocker)- and TNP-ATP (a P2X antagonist)-induced analgesic effects in TIIP rats. In naïve rats, i.pl. injection of Sig-1R agonist PRE-084 alone did not produce MA; but it did induce MA when co-administered with either an acidic pH solution or a sub-effective dose of αβmeATP. CONCLUSION Peripheral Sig-1Rs contribute to the induction of ischaemia-induced MA via facilitation of ASICs and P2X receptors. Thus, peripheral Sig-1Rs represent a novel therapeutic target for the treatment of ischaemic pain.
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Affiliation(s)
- S G Kwon
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Korea
| | - D H Roh
- Department of Maxillofacial Tissue Regeneration, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - S Y Yoon
- Pain Cognitive Function Research Center, Department of Brain and Cognitive Sciences College of Natural Sciences, Seoul National University, Korea
- Dental Research Institute and Department of Neurobiology and Physiology, School of Dentistry, Seoul National University, Korea
| | - S R Choi
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Korea
| | - H S Choi
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Korea
| | - J Y Moon
- KM Fundamental Research Division, Korea Institute of Oriental Medicine, Daejeon, Korea
| | - S Y Kang
- KM Fundamental Research Division, Korea Institute of Oriental Medicine, Daejeon, Korea
| | - H W Kim
- Department of Physiology, Institute of Brain Research, Chungnam National University Medical School, Daejeon, Korea
| | - H J Han
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Korea
| | - A J Beitz
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St Paul, USA
| | - S B Oh
- Pain Cognitive Function Research Center, Department of Brain and Cognitive Sciences College of Natural Sciences, Seoul National University, Korea
- Dental Research Institute and Department of Neurobiology and Physiology, School of Dentistry, Seoul National University, Korea
| | - J H Lee
- Department of Veterinary Physiology, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Korea
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Ng PS, Wen WX, Fadlullah MZH, Yoon SY, Lee SY, Thong MK, Yip CH, Mohd Taib NA, Teo SH. Identification of germline alterations in breast cancer predisposition genes among Malaysian breast cancer patients using panel testing. Clin Genet 2016; 90:315-23. [PMID: 26757417 DOI: 10.1111/cge.12735] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 01/07/2016] [Accepted: 01/08/2016] [Indexed: 12/23/2022]
Abstract
Although an association between protein-truncating variants and breast cancer risk has been established for 11 genes, only alterations in BRCA1, BRCA2, TP53 and PALB2 have been reported in Asian populations. Given that the age of onset of breast cancer is lower in Asians, it is estimated that inherited predisposition to breast cancer may be more significant. To determine the potential utility of panel testing, we investigated the prevalence of germline alterations in 11 established and 4 likely breast cancer genes in a cross-sectional hospital-based cohort of 108 moderate to high-risk breast cancer patients using targeted next generation sequencing. Twenty patients (19%) were identified to carry deleterious mutations, of whom 13 (12%) were in the BRCA1 or BRCA2, 6 (6%) were in five other known breast cancer predisposition genes and 1 patient had a mutation in both BRCA2 and BARD1. Our study shows that BRCA1 and BRCA2 account for the majority of genetic predisposition to breast cancer in our cohort of Asian women. Although mutations in other known breast cancer genes are found, the functional significance and breast cancer risk have not yet been determined, thus limiting the clinical utility of panel testing in Asian populations.
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Affiliation(s)
- P S Ng
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia.,University Malaya Cancer Research Institute, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia
| | - W X Wen
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia.,University Malaya Cancer Research Institute, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia
| | | | - S Y Yoon
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia
| | - S Y Lee
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia
| | - M K Thong
- Department of Paediatrics, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia
| | - C H Yip
- Subang Jaya Medical Centre, Subang Jaya, Selangor, Malaysia
| | - N A Mohd Taib
- University Malaya Cancer Research Institute, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia.,Department of Surgery, Faculty of Medicine, University Malaya Medical Centre, Kuala Lumpur, Malaysia
| | - S H Teo
- Cancer Research Malaysia, Subang Jaya, Selangor, Malaysia. .,University Malaya Cancer Research Institute, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia. .,Department of Surgery, Faculty of Medicine, University Malaya Medical Centre, Kuala Lumpur, Malaysia.
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Lee JH, Yang TU, Lee HW, Yoon SY, Lim CS. Bacteraemia caused by Fusobacterium necrophorum: a clinical approach to Lemierre's syndrome. Br J Biomed Sci 2016; 72:203-5. [PMID: 26738404 DOI: 10.1080/09674845.2015.11665754] [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: 10/18/2022]
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Kim DH, Hwang KH, Lee JD, Park HC, Yoon SY. Long and short range order structural analysis of In-situ formed biphasic calcium phosphates. Biomater Res 2015; 19:14. [PMID: 26722623 PMCID: PMC4697325 DOI: 10.1186/s40824-015-0036-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Accepted: 05/09/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Biphasic calcium phosphates (BCP) have attracted considerable attention as a bone graft substitute. In this study, BCP were prepared by aqueous co-precipitation and calcination method. The crystal phases of in-situ formed BCP consisting of hydroxyapatite (HAp) and β-tricalcium phosphate (β-TCP) were controlled by the degree of calcium deficiency of precursors. The long and short range order structures of biphasic mixtures was investigated using Rietveld refinement technique and high resolution Raman spectroscopy. The refined structural parameters of in-situ formed BCP confirmed that all the investigated structures have crystallized in the corresponding hexagonal (space group P63/m) and rhombohedral (space group R3c) structures. RESULTS The crystal phases, Ca/P molar ratio, and lattice parameters of in-situ formed BCP consisting of HAp and β-TCP were controlled by the degree of calcium deficiency of calcium phosphate precursors. The significant short range order structural change of BCP was determined by Raman analysis. CONCLUSIONS The long and short range order structural changes of in-situ formed BCP might be due to the coexistence of β-TCP and HAp crystal phases.
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Affiliation(s)
- Dong-Hyun Kim
- />School of Materials Science and Engineering, Pusan National University, Busan, 609-735 Republic of Korea
| | - Kyu-Hong Hwang
- />School of Nano and Advanced Materials, Gyeongsang National University, Jinju, Gyeongnam 660-701 Republic of Korea
| | - Ju Dong Lee
- />Korea Institute of Industrial Technology, Busan, 618-230 Republic of Korea
| | - Hong-Chae Park
- />School of Materials Science and Engineering, Pusan National University, Busan, 609-735 Republic of Korea
| | - Seog-Young Yoon
- />School of Materials Science and Engineering, Pusan National University, Busan, 609-735 Republic of Korea
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Kim DH, Shin KK, Jung JS, Chun HH, Park SS, Lee JK, Park HC, Yoon SY. The Role of Magnesium Ion Substituted Biphasic Calcium Phosphate Spherical Micro-Scaffolds in Osteogenic Differentiation of Human Adipose Tissue-Derived Mesenchymal Stem Cells. J Nanosci Nanotechnol 2015; 15:5520-5523. [PMID: 26369111 DOI: 10.1166/jnn.2015.10463] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study was investigated the role of magnesium (Mg2+) ion substituted biphasic calcium phosphate (Mg-BCP) spherical micro-scaffolds in osteogenic differentiation of human adipose tissue-derived mesenchymal stem cells (hAT-MSCs). Mg-BCP micro-scaffolds with spherical morphology were successfully prepared using in situ co-precipitation and spray drying atomization process. The in vitro cell proliferation and differentiation of hAT-MSCs were determined up to day 14. After in vitro biological tests, Mg-BCP micro-scaffolds with hAT-MSCs showed more enhanced osteogenicity than pure hAT-MSCs as control group by unique biodegradation of TCP phase and influence of substituted Mg2+ ion in biphasic nanostructure. Therefore, these results suggest that Mg-BCP micro-scaffolds promote osteogenic differentiation of hAT-MSCs.
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Zhao JM, Park WU, Hwang KH, Lee JK, Yoon SY. Biomimetic Deposition of Hydroxyapatite by Mixed Acid Treatment of Titanium Surfaces. J Nanosci Nanotechnol 2015; 15:2552-2555. [PMID: 26413704 DOI: 10.1166/jnn.2015.10266] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A simple chemical method was established for inducing bioactivity of Ti metal. In the present study, two kinds of mixed acid solutions were used to treat Ti specimens to induce Ca-P formation. Following a strong mixed acid activation process, Ca-P coatings successfully formed on the Ti surfaces in the simulated body fluid. Strong mixed acid etching was used to increase the roughness of the metal surface, because the porous and rough surfaces allow better adhesion between Ca-P coatings and substrate. Nano-scale modification of titanium surfaces can alter cellular and tissue responses, which may benefit osseointegration and dental implant therapy. Some specimens were treated with a 5 M NaOH aqueous solution, and then heat treated at 600 °C in order to form an amorphous sodium titanate layer on their surface. This treated titanium metal is believed to form a dense and uniform bone-like apatite layer on its surface in a simulated body fluid (SBF). This study proved that mixed acid treatment is not only important for surface passivation but is also another bioactive treatment for titanium surfaces, an alternative to alkali treatment. In addition, mixed acid treatment uses a lower temperature and shorter time period than alkali treatment.
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Jang JW, Cho CH, Kim JY, Koh YE, Woo MK, Kim KA, Yoon SY, Lim MS, Han ET, An S SA, Lim CS. Rapid genotyping of Plasmodium vivax Pvs25 and Pv38 genes by using mismatch specific endonuclease. Trop Biomed 2014; 31:600-606. [PMID: 25776585] [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: 06/04/2023]
Abstract
Mismatch specific endonuclease (MSE) method was used to detect natural polymorphisms in Pvs25 and Pv38 genes of Plasmodium vivax. Eighty seven patients with P. vivax were recruited in the Republic of Korea (ROK). Pvs25 and Pv38 genes were amplified by polymerase chain reaction (PCR), and the PCR amplicons were mixed with reference DNA sequences. Following the denaturation and gradual annealing, the product mixtures were cleaved by the MSE. Heteroduplex types were readily detected by gel electrophoresis, where extra bands with shorter sizes would appear from the cleavage. After MSE cleavage of 657- bp product from Pvs25 mixtures, three genotypes were detected, while Pv38 mixtures with 1220-bp products presented two genotypes in ROK isolates. After the MSE cleavage, the mismatched samples of Pvs25 and Pv38 were completely sequenced, and the results were in complete agreement with the MSE analyses. In conclusion, genotyping of Pvs25 and Pv38 with MSE cleavage could be a potential method for the high-throughput screening of the large field samples.
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Affiliation(s)
- J W Jang
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - C H Cho
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - J Y Kim
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - Y E Koh
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - M K Woo
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - K A Kim
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - S Y Yoon
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
| | - M S Lim
- BioMedical Engineering, Korea University, Seoul, Korea
| | - E T Han
- Department of Parasitology, College of Medicine, Kangwon National University, Chuncheon, Korea
| | - S A An S
- College of Bionano Technology, Gachon Bionano Research Institute, Kyungwon University, Seongnam, Korea
| | - C S Lim
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, Korea
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Moon JY, Roh DH, Yoon SY, Choi SR, Kwon SG, Choi HS, Kang SY, Han HJ, Beitz AJ, Oh SB, Lee JH. σ1 receptors activate astrocytes via p38 MAPK phosphorylation leading to the development of mechanical allodynia in a mouse model of neuropathic pain. Br J Pharmacol 2014; 171:5881-97. [PMID: 25158784 PMCID: PMC4290724 DOI: 10.1111/bph.12893] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Revised: 08/12/2014] [Accepted: 08/21/2014] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND AND PURPOSE Spinal astrocytes have emerged as important mechanistic contributors to the genesis of mechanical allodynia (MA) in neuropathic pain. We recently demonstrated that the spinal sigma non-opioid intracellular receptor 1 (σ1 receptor) modulates p38 MAPK phosphorylation (p-p38), which plays a critical role in the induction of MA in neuropathic rats. However, the histological and physiological relationships among σ1, p-p38 and astrocyte activation is unclear. EXPERIMENTAL APPROACH We investigated: (i) the precise location of σ1 receptors and p-p38 in spinal dorsal horn; (ii) whether the inhibition of σ1 receptors or p38 modulates chronic constriction injury (CCI)-induced astrocyte activation; and (iii) whether this modulation of astrocyte activity is associated with MA development in CCI mice. KEY RESULTS The expression of σ1 receptors was significantly increased in astrocytes on day 3 following CCI surgery. Sustained intrathecal treatment with the σ1 antagonist, BD-1047, attenuated CCI-induced increase in GFAP-immunoreactive astrocytes, and the treatment combined with fluorocitrate, an astrocyte metabolic inhibitor, synergistically reduced the development of MA, but not thermal hyperalgesia. The number of p-p38-ir astrocytes and neurons, but not microglia was significantly increased. Interestingly, intrathecal BD-1047 attenuated the expression of p-p38 selectively in astrocytes but not in neurons. Moreover, intrathecal treatment with a p38 inhibitor attenuated the GFAP expression, and this treatment combined with fluorocitrate synergistically blocked the induction of MA. CONCLUSIONS AND IMPLICATIONS Spinal σ1 receptors are localized in astrocytes and blockade of σ1 receptors inhibits the pathological activation of astrocytes via modulation of p-p38, which ultimately prevents the development of MA in neuropathic mice.
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Affiliation(s)
- J Y Moon
- Department of Veterinary Physiology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National UniversitySeoul, Korea
| | - D H Roh
- Department of Maxillofacial Tissue Regeneration, Kyung Hee University School of DentistrySeoul, Korea
| | - S Y Yoon
- Laboratory of Molecular Signal Transduction, Center for Neural Science, Korea Institute of Science and Technology (KIST)Seoul, Korea
| | - S R Choi
- Department of Veterinary Physiology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National UniversitySeoul, Korea
| | - S G Kwon
- Department of Veterinary Physiology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National UniversitySeoul, Korea
| | - H S Choi
- Department of Veterinary Physiology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National UniversitySeoul, Korea
| | - S Y Kang
- Acupuncture, Moxibustion and Meridian Research Group, Medical Research Division, Korea Institute of Oriental MedicineDaejeon, Korea
| | - H J Han
- Department of Veterinary Physiology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National UniversitySeoul, Korea
| | - A J Beitz
- Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of MinnesotaSt Paul, MN, USA
| | - S B Oh
- Pain Cognitive Function Research Center, Department of Brain and Cognitive Sciences College of Natural Sciences, Dental Research Institute and Department of Neurobiology and Physiology, School of Dentistry, Seoul National UniversitySeoul, Korea
| | - J H Lee
- Department of Veterinary Physiology, College of Veterinary Medicine and Research Institute for Veterinary Science, Seoul National UniversitySeoul, Korea
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Park WU, Zhao JM, Hwang KH, Kim TS, Kim JH, Yoon SY, Lee JK. Evaluation of the bonding strength of dental zirconia with veneering porcelains. J Nanosci Nanotechnol 2014; 14:7843-7846. [PMID: 25942878 DOI: 10.1166/jnn.2014.9408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The effect of thermo-cycling treatment on the bond strength and flexural strength of porcelain veneered zirconia was evaluated. After thermo-cycling treatment between 5 degrees C to 55 degrees C, porcelain-zirconia bond strength and zirconia flexural strength was not significantly affected. In the phase analyses using XRD after thermo-cycling treatment, both the experimental group and the control group showed only tetragonal phases. That is, the porcelain-zirconia bond strength and zirconia flexural strength were not affected by low temperature degradation. So low temperature aging treatment did not reduce the flexural strength and the effect of temperature applied to the aging treatment could beignorable.
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Jung SW, Kim DS, Yu YD, Ji WB, Park PJ, Choi SB, Park JW, Yoon SY, Han HJ, Song TJ, Choi SY, Suh SO. Does procurement technique affect posttransplant graft function in deceased donor liver transplantation? Transplant Proc 2014; 45:2880-5. [PMID: 24156997 DOI: 10.1016/j.transproceed.2013.08.084] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
INTRODUCTION Various techniques have been described deceased donor liver transplantation (DDLT) procurement. One is a technique whereby almost total dissection is done in the porta hepatis and perihepatic detachment is carried out before cross-clamping the donor aorta. In another approach, after the donor aorta is cross-clamped, rapid and minimal en bloc dissection is performed with minimal manipulation. We evaluated early posttransplant graft function among liver procurement techniques. METHOD Between January 2008 and August 2012, we performed 45 consecutive adult DDLTs. One patient was excluded from this analysis due to early death from sepsis after transplantation. The 44 included patients were divided into two cohorts according to the procurement technique: A warm dissection (n = 23; 52%) and a cold dissection group (n = 21; 48%). We compared early posttransplant graft function using the aspartate aminotransferase (AST), alanine aminotransferase (ALT), total bilirubin (T-bil), and prothrombin time (PT) values of the two groups from the first to seventh postoperative day. RESULT The AST values in the warm group were significantly greater than those in the cold group on postoperative days 3 and 5. In addition, the ALT values in the warm group were greater than those in the cold group on postoperative days 4, 5, and 6. Moreover, the T-bil values in the warm group were greater than those in the cold group on postoperative days 2, 3, 4, 5, 6, and 7. However, there were no differences in PT values. CONCLUSION During liver procurement for DDLT, rapid en bloc procurement with minimal manipulation after clamping the donor aorta achieved better early graft function posttransplantation.
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Affiliation(s)
- S W Jung
- Department of Surgery, Korea University College of Medicine, Seoul, Korea
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Kim DH, Park SS, Lee JD, Park HC, Yoon SY. Phase transformation behavior of spherical tricalcium phosphate micro-granules prepared by a jet wheel impact atomization and calcination process. POWDER TECHNOL 2014. [DOI: 10.1016/j.powtec.2014.02.055] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Joo BH, Yoon SY, Sung YM. Effect of annealing temperature on electrochemical luminescence properties of nanoporous fluorine-doped tin oxide films. J Nanosci Nanotechnol 2013; 13:2981-2985. [PMID: 23763189 DOI: 10.1166/jnn.2013.7400] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Nanoporous Fluorine-doped tin oxide (FTO) materials were synthesized by sol-gel combustion method for electrochemical luminescence (ECL) application. The influence of annealing temperature on the structures and morphology of the nanoporous FTO films was examined by X-ray diffraction (XRD), atomic force microscopy (AFM), optical transmittance and BET specific surface measurements. The naoporous FTO-based ECL cell is composed of FTO glass/nanoporous FTO/Ru(bpy)2+ electrolyte/FTO glass. The peak intensity of emitting light from the cell was obtained at the wavelength of about 615 nm, which corresponds to dark orange color. At 5 V bias, ECL efficiency of the cell using the 550 degrees C annealed FTO was about 975 cd/m2, which is much higher than those of other cells. The result shows that the nanoporous FTO layer was more effective for increasing ECL intensities. The sol-gel combustion method at annealing temperature of 550 degrees C could be employed to synthesize the nanoporous FTO materials with high porosity and ECL performance.
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Affiliation(s)
- Bong-Hyun Joo
- Electrical Engineering, Kyungsung University, Busan 608-736, Korea
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Yoon SY, Kim TB, Baek S, Kim S, Kwon HS, Lee YS, Lee T, Jang AS, Chang YS, Cho SH, Choi BW, Park JW, Nham DH, Yoon HJ, Cho YJ, Park CS, Moon HB, Cho YS. The impact of total antioxidant capacity on pulmonary function in asthma patients. Int J Tuberc Lung Dis 2013; 17:1036-42. [PMID: 23044449 DOI: 10.5588/ijtld.12.0842] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Oxidative stress, mediated by an imbalance between oxidants and antioxidants, contributes significantly to the pathogenesis of asthma. OBJECTIVE To evaluate the impact of serum total antioxidant capacity (TAC) on the pulmonary function of Korean asthma patients. METHOD A total of 104 adult asthma patients enrolled from the COREA (Cohort for Reality and Evolution of Adult Asthma in Korea) programme participated in the study. Baseline clinical parameters at enrolment, and the results of pulmonary function tests at baseline and 1 and 2 years after enrolment were collected. TAC at baseline was measured using a Trolox-equivalent antioxidant capacity assay. Patients were divided into two groups based on TAC levels, and various clinical parameters were compared. RESULT Serum TAC levels correlated with forced expiratory volume in 1 second (FEV(1)) at baseline (r = 0.22, P = 0.03). The group with higher baseline TAC levels maintained greater mean FEV(1) both 1 and 2 years after enrolment, even after adjusting for sex, age, height, weight, body mass index and smoking status. CONCLUSION These results suggest an important link between serum TAC levels and pulmonary function, indicating that higher TAC levels may be a biomarker for favourable prognosis in asthma patients.
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Affiliation(s)
- S Y Yoon
- Division of Allergy and Clinical Immunology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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Ok KM, Kim KL, Kim TW, Kim DH, Park HD, Sung YM, Park HC, Yoon SY. Preparation and characterization of La 0.8Sr 0.2Ga 0.8Mg 0.1Co 0.1O 3-δ electrolyte using glycine-nitrate process. Journal of the Korean Crystal Growth and Crystal Technology 2013. [DOI: 10.6111/jkcgct.2013.23.1.037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kim TW, Kim DH, Jin HH, Lee SH, Park HC, Yoon SY. Synthesis and bioactivity evaluation of metal ion-substitution biphasic calcium phosphate for bone defect reconstruction. Journal of the Korean Crystal Growth and Crystal Technology 2012. [DOI: 10.6111/jkcgct.2012.22.6.279] [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: 11/09/2022]
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Yoon SY, Park HS, Yoon HS, Chung JH, Cho S. Utility of epithelial membrane antigen immunostaining in the differentiation between palmoplantar pustulosis and pompholyx. J Eur Acad Dermatol Venereol 2012; 27:1054-6. [PMID: 22988903 DOI: 10.1111/j.1468-3083.2012.04702.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Jin HH, Kim DH, Kim TW, Shin KK, Jung JS, Park HC, Yoon SY. In vivo evaluation of porous hydroxyapatite/chitosan-alginate composite scaffolds for bone tissue engineering. Int J Biol Macromol 2012; 51:1079-85. [PMID: 22959955 DOI: 10.1016/j.ijbiomac.2012.08.027] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Revised: 08/03/2012] [Accepted: 08/23/2012] [Indexed: 11/24/2022]
Abstract
Porous hydroxyapatite (HAp)/chitosan-alginate composite scaffolds were prepared through in situ co-precipitation and freeze-drying for bone tissue engineering. The composite scaffolds were highly porous and interconnected with a pore size of around 50-220 μm at low concentrations of HAp. As the HAp content increased, the porosity of the scaffolds decreased from 84.98 to 74.54%. An MTT assay indicates that the obtained scaffolds have no cytotoxic effects on MG-63 cells, and that they have good biocompatibility. An implantation experiment in mouse skulls revealed that the composite scaffold provides a strong positive effect on bone formation in vivo in mice. Furthermore, that HAp/chitosan-alginate composite scaffold has been shown to be more effective for new bone generation than chitosan-alginate scaffold.
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Affiliation(s)
- Hyeong-Ho Jin
- School of Materials Science and Engineering, Pusan National University, San 30, Jangjeon-dong, Gumjeong-gu, Busan 609-735, Republic of Korea
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Yoon SY, Bennett GM. Effects of a stimulus-stimulus pairing procedure on conditioning vocal sounds as reinforcers. Anal Verbal Behav 2012; 17:75-88. [PMID: 22477215 DOI: 10.1007/bf03392957] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Two experiments were conducted to investigate the effects of stimulus-stimulus pairing on conditioning vocal sounds as reinforcers. Four preschoolers with severe language and communication delays participated. In Experiment 1, an attempt was made to condition vocal sounds as a reinforcer by pairing a specific vocal sound with a reinforcing event (e.g., physical interaction). Results indicated that presentation of a stimulus-stimulus pairing was effective in conditioning the target vocal sounds as reinforcers, which increased the occurrence of vocalizations of those sounds by the participants. Experiment 2 compared the effects of the pairing procedure with those of echoic training. The pairing procedure was identical to that in Experiment 1. In the echoic training condition, the experimenter produced the target vocal sound and gave the participant an opportunity to echo. The same reinforcing stimulus (e.g., physical interaction) was provided contingent upon the occurrence of the target vocal sound emitted by the participant. Results showed that the pairing procedure was more effective than the echoic training. Findings from this study suggest that for these participants, who had no vocal imitation skills, the stimulus-stimulus pairing was an effective procedure for conditioning vocal sounds as reinforcers and increased the probability of occurrence of the vocalization without a direct reinforcement contingency.
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Hwang S, Ahn CS, Kim KH, Moon DB, Ha TY, Song GW, Jung DH, Park GC, Namgoong JM, Yoon SY, Jung SW, Lee SG. Standardization of modified right lobe grafts to minimize vascular outflow complications for adult living donor liver transplantation. Transplant Proc 2012; 44:457-9. [PMID: 22410043 DOI: 10.1016/j.transproceed.2012.01.072] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND After >2000 adult living donor liver transplants (LDLTs), we observed minimization of the complication rate using case-by-case modification of venous outflow reconstruction in right liver graft (RLG), standardization seeking intend to provide a hemodynamic- based, regeneration-compliant hepatic outflow reconstruction. METHODS We retrospectively examined 100 consecutive adult LDLT using modified RLG before and after application of RLG standardization to compare the 6-month incidences of vascular outflow complications. RESULT The right hepatic vein stenting rate for first 6 months was 5% in the customized group and 1% in the standardized group (P=.212). The middle hepatic vein stenting rate for first 6 months was 9% in the customized group and 4% in the standardized group (P=.373). The inferior right hepatic vein stenting rate for first 6 months was 12.8% in the customized group and 7.1% in the standardized group (P=.472). The overall 6-month patient survival rate was 94% in the customized group and 95% in the standardized group (P=.867). The overall incidence of significant RLG venous outflow complications was 19% in the customized group and 8% in the standardized group (P=.023). CONCLUSION Standardization as a universal graft model seemed to be more effective and feasible than conventional graft customization requiring individualized case-by-case modification.
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Affiliation(s)
- S Hwang
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
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Park HW, Hwang S, Ahn CS, Kim KH, Moon DB, Ha TY, Song GW, Jung DH, Park GC, Namgoong JM, Yoon SY, Park CS, Park YH, Lee HJ, Lee SG. De novo malignancies after liver transplantation: incidence comparison with the Korean cancer registry. Transplant Proc 2012; 44:802-5. [PMID: 22483500 DOI: 10.1016/j.transproceed.2012.01.027] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
PURPOSE De novo malignancy is not uncommon after liver transplantation (OLT). We have compared the incidence of novo malignancy following OLT with those among the general Korean population. METHODS Between January 1998 and December 2008, 1952 adult OLT were performed, including 1714 living donor and 238 deceased donor grafts whose medical records were retrospectively reviewed. RESULTS Among the 1952 patients, 44 (2.3%) showed de novo malignancies after a mean posttransplant period of 41 months. Among the 14 types of malignancy the most frequent was stomach cancer (n = 11; 25.0%), colorectal cancer (n = 9; 20.5%), breast cancer (n = 4; 9.1%), and thyroid cancer (n = 3; 6.8%). These patients underwent aggressive treatment, including surgery, chemotherapy, and radiotherapy, except for one patient with an aggressive primary liver cancer. Over a mean follow-up of 45 months after diagnosis of de novo malignancy, 13 patients (29.5%) died; the overall 3-year patient survival rate was 67.5%. The relative risk of malignancy following OLT was 7.7-fold higher in men and 7.3-fold higher in women than the Korean general population. CONCLUSIONS OLT recipients must be checked periodically for de novo malignancy throughout their lives, especially for cancers common in the general population.
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Affiliation(s)
- H W Park
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Kim TW, Kim DH, Jin HH, Lee HS, Park HC, Yoon SY. Bioactivity behavior of Si and Mg ion-substituted biphasic calcium phosphate powders. Journal of the Korean Crystal Growth and Crystal Technology 2012. [DOI: 10.6111/jkcgct.2012.22.2.092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kim TW, Kim DH, Jin HH, Lee HS, Park HC, Yoon SY. Bioactivity behavior of biphasic calcium phosphate powders prepared by co-precipitation method. Journal of the Korean Crystal Growth and Crystal Technology 2012. [DOI: 10.6111/jkcgct.2012.22.2.099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Park J, Chung S, An H, Kim J, Seo J, Kim DH, Yoon SY. Haloperidol and clozapine block formation of autophagolysosomes in rat primary neurons. Neuroscience 2012; 209:64-73. [PMID: 22390943 DOI: 10.1016/j.neuroscience.2012.02.035] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 02/16/2012] [Accepted: 02/16/2012] [Indexed: 12/13/2022]
Abstract
Early intervention and maintenance treatment for schizophrenia patients may prolong the duration of exposure to antipsychotic agents; however, there have been few studies on the neurotoxicity of these agents. Here, we investigated the effects of antipsychotics on cell viability and autophagy in rat primary neurons. Cultured cortical neurons obtained from rat embryos were treated with various concentrations of haloperidol and clozapine, and the neuronal toxicity was assessed by measuring lactate dehydrogenase (LDH) activity and 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay. Autophagosomes were quantitated by measuring the level of microtubule-associated protein 1A/1B-light chain 3 (LC3-II) by Western blot and immunofluorescence staining. Autophagic flux was assayed using bafilomycin A1 and GFP-mCherry-LC3 transfection. Haloperidol and clozapine decreased the viability of neurons in vitro in a concentration- and time-dependent manner. We also observed increased accumulation of autophagosomes after antipsychotic treatment. Using bafilomycin A1 and GFP-mCherry-LC3 transfection, we discovered that haloperidol and clozapine inhibited autophagosome turnover resulting in a dysfunctional autophagic process, including impaired lysosomal fusion. Together, these results suggest that haloperidol and clozapine negatively affect neuronal viability, possibly by blocking autophagolysosome formation.
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Affiliation(s)
- J Park
- Department of Psychiatry, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
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Taib NA, Woo YL, Yoon SY, Kartini R, Thong MK, Yip CH, Teo SH. Early experience in a breast and ovarian cancer risk management clinic in Malaysia. Hered Cancer Clin Pract 2012. [PMCID: PMC3327290 DOI: 10.1186/1897-4287-10-s2-a58] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Choi BS, Kim DH, Kim TW, Jin HH, Park HC, Yoon SY. Intercalation behavior study of ibuprofen/clay organic-inorganic nanocomposites as drug release system. Journal of the Korean Crystal Growth and Crystal Technology 2011. [DOI: 10.6111/jkcgct.2011.21.6.240] [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: 11/09/2022]
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Kang MW, Lee ES, Yoon SY, Jo J, Lee J, Kim HK, Choi YS, Kim K, Shim YM, Kim J, Kim H. AKR1B10 is associated with smoking and smoking-related non-small-cell lung cancer. J Int Med Res 2011; 39:78-85. [PMID: 21672310 DOI: 10.1177/147323001103900110] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
This prospective study explored the relationship between expression of AKR1B10 mRNA and various clinical parameters in non-small-cell lung cancer (NSCLC) in terms of its validation as a marker for NSCLC. Tumour tissue samples were collected from 229 patients with NSCLC. Tissue samples from adjacent non-malignant lung tissue (> 5 cm from the tumour) of 89 of these patients and samples from 20 patients with benign lung disease were used as controls. Quantitative reverse transcription- polymerase chain reaction showed significantly higher levels of AKR1B10 mRNA expression in NSCLC tumour tissue than in adjacent non-malignant lung tissue and benign lung tissue. Statistically significant factors for AKR1B10 mRNA over-expression were found to be male gender, smoking, squamous cell carcinoma and moderate or poor cell differentiation. It is concluded that AKR1B10 seems to have potential as a prognostic marker for NSCLC and warrants further investigation.
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Affiliation(s)
- M-W Kang
- Cancer Research Centre, Centre for Clinical Research, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Seoul, Korea
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Kim DH, Song CW, Kim TW, Jin HH, Park HC, Yoon SY. Characterization of the biodegradable behavior for biphasic calcium phosphates using X-ray diffraction and lattice parameter. Journal of the Korean Crystal Growth and Crystal Technology 2011. [DOI: 10.6111/jkcgct.2011.21.4.169] [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: 11/09/2022]
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Jin HH, Lee CH, Kim DH, Kim TW, Hwang KH, Lee JK, Park HC, Yoon SY. Morphologies of nano-sized apatite formed on titanium substrate by biomimetic process. J Nanosci Nanotechnol 2011; 11:7438-7441. [PMID: 22103214 DOI: 10.1166/jnn.2011.4870] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The apatite was formed on the titanium plates with NaOH and heat treatments by biomimetic process. The influence of titanium surface microstructure on the apatite formation onto titanium substrate in SBF solution was investigated. After biomimetic process, nano-sized apatite layers were found on the Ti plates with NaOH and heat treatments. However, the morphologies of formed apatite on substrate had different shapes such as coated, load-like, and linked. The morphology of apatite formed by biomimetic process would be affected by alkaline treatment, and substrate morphology and phase.
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Affiliation(s)
- Hyeong-Ho Jin
- School of Materials Science and Engineering, Pusan National University, Busan, 609-735, Korea
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