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Heo GY, Kim HJ, Kalantar D, Jung CY, Kim HW, Park JT, Chang TI, Yoo TH, Kang SW, Rhee CM, Kalantar-Zadeh K, Han SH. Association between Fiber Intake and Risk of Incident Chronic Kidney Disease: The UK Biobank Study. J Nutr Health Aging 2023; 27:1018-1027. [PMID: 37997724 DOI: 10.1007/s12603-023-1998-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Accepted: 09/13/2023] [Indexed: 11/25/2023]
Abstract
OBJECTIVES Dietary fiber intake is associated with a lower risk of diabetes, cardiovascular disease, and cancer. However, it is unknown whether dietary fiber has a beneficial effect on preventing the development of chronic kidney disease (CKD). DESIGN, SETTING, PARTICIPANTS AND MEASUREMENTS Using the UK Biobank prospective cohort, 110,412 participants who completed at least one dietary questionnaire and had an estimated glomerular filtration rate ≥60 mL/min/1.73 m2, urinary albumin-to-creatinine ratio <30 mg/g, and no history of CKD were included. The primary exposure was total dietary fiber density, calculated by dividing the absolute amount of daily total fiber intake by total energy intake (g/1,000 kcal). We separately examined soluble and insoluble fiber densities as additional predictors. The primary outcome was incident CKD based on diagnosis codes. RESULTS A total of 3,507 (3.2%) participants developed incident CKD during a median follow-up of 9.9 years. In a multivariable cause-specific model, the adjusted hazard ratios (aHRs; 95% confidence intervals [CIs]) for incident CKD were 0.85 (0.77-0.94), 0.78 (0.70-0.86), and 0.76 (0.68-0.86), respectively, for the second, third, and highest quartiles of dietary fiber density (reference: lowest quartile). In a continuous model, the aHR for each +∆1.0g/1,000 kcal increase in dietary fiber density was 0.97 (95% CI, 0.95-0.99). This pattern of associations was similar for both soluble and insoluble fiber densities and did not differ across subgroups of sex, age, body mass index, hypertension, diabetes, smoking, and inflammation. CONCLUSION Increased fiber intake was associated with a lower risk of CKD in this large well-characterized cohort.
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Affiliation(s)
- G Y Heo
- Seung Hyeok Han, MD, Ph.D. Yonsei University, Institute of Kidney Disease Research, College of Medicine, Department of Internal Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea, Phone: 82-2-2228-1984; Fax: 82-2-393-6884; E-mail: , (https://orcid.org/0000-0001-7923-5635)
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Kwon JB, Kim SW, Kang BH, Yeom SH, Lee WH, Kwon DH, Lee JS, Kang SW. Air-stable and ultrasensitive solution-cast SWIR photodetectors utilizing modified core/shell colloidal quantum dots. Nano Converg 2020; 7:28. [PMID: 32803407 PMCID: PMC7429620 DOI: 10.1186/s40580-020-00238-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 07/16/2020] [Indexed: 06/11/2023]
Abstract
InGaAs-based photodetectors have been generally used for detection in the short-wave infrared (SWIR) region. However, the epitaxial process used to grow these materials is expensive; therefore, InGaAs-based photodetectors are limited to space exploration and military applications. Many researchers have expended considerable efforts to address the problem of SWIR photodetector development using lead sulfide (PbS) quantum dots (QDs). Along with their cost-efficient solution processability and flexible substrate compatibility, PbS QDs are highly interesting for the quantum-size-effect tunability of their bandgaps, spectral sensitivities, and wide absorption ranges. However, the performance of PbS QD-based SWIR photodetectors is limited owing to inefficient carrier transfer and low photo and thermal stabilities. In this study, a simple method is proposed to overcome these problems by incorporating CdS in PbS QD shells to provide efficient carrier transfer and enhance the long-term stability of SWIR photodetectors against oxidation. The SWIR photodetectors fabricated using thick-shell PbS/CdS QDs exhibited a high on/off (light/dark) ratio of 11.25 and a high detectivity of 4.0 × 1012 Jones, which represents a greater than 10 times improvement in these properties relative to those of PbS QDs. Moreover, the lifetimes of thick-shell PbS/CdS QD-based SWIR photodetectors were significantly improved owing to the self-passivation of QD surfaces.
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Affiliation(s)
- Jin-Beom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Sae-Wan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea
| | - Byoung-Ho Kang
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea
| | - Se-Hyuk Yeom
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea
| | - Wang-Hoon Lee
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea
| | - Dae-Hyuk Kwon
- Department of Electronic Engineering, Kyungil University, Hayang-up, 712-702, Gyeongsang buk-do, Republic of Korea
| | - Jae-Sung Lee
- Advanced Semiconductor Research Center, Gumi Electronics and Information Technology Research Institute (GERI), Gumi, 39253, Republic of Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu, 702-701, Republic of Korea.
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Han M, Kim JK, Lee J, An HK, Yun JP, Kang SW, Jung D. Room-Temperature Hydrogen-Gas Sensor Based on Carbon Nanotube Yarn. J Nanosci Nanotechnol 2020; 20:4011-4014. [PMID: 31968415 DOI: 10.1166/jnn.2020.17607] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The proposed study describes the development of a carbon nanotube (CNT)-based gas sensor capable of detecting the presence of hydrogen (H₂) gas at room temperature. CNT yarn used in the proposed sensor was fabricated from synthesized CNT arrays. Subsequently, the yarn was treated by means of a simple one-step procedure, called acid treatment, to facilitate removal of impurities from the yarn surface and forming functional species. To verify the proposed sensor's effectiveness with regard to detection of H₂ gas at room temperature, acid-treated CNT and pure yarns were fabricated and tested under identical conditions. Corresponding results demonstrate that compared to the untreated CNT yarn, the acid-treated CNT yarn exhibits higher sensitivity to the presence of H₂ gas at room temperature. Additionally, the acid-treated CNT yarn was observed to demonstrate excellent selectivity pertaining to H₂ gas.
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Affiliation(s)
- Maeum Han
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Jae Keon Kim
- AI System Engineering Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
| | - Junyeop Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hee Kyung An
- Mechatronics Technology Convergence R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
| | - Jong Pil Yun
- AI System Engineering Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Daewoong Jung
- AI System Engineering Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
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Han M, Kim JK, Lee J, An HK, Yun JP, Kang SW, Jung D. H₂ Gas Sensor Based on Pd-Loaded Carbon Nanotube Film. J Nanosci Nanotechnol 2020; 20:4470-4473. [PMID: 31968499 DOI: 10.1166/jnn.2020.17608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Palladium-coated multi-walled carbon nanotube (Pd-MWCNT) nanocomposites have been experimentally proven to show highly improved hydrogen (H₂) gas detection characteristics at room temperature when compared with single MWCNTs. In this context, we develop an efficient and convenient method for forming nanocomposites by coating Pd nanoparticles on an MWCNT film. Furthermore, we test the applicability of the nanocomposites as sensing materials in detecting H₂ gas at room temperature in a reliable and sensitive manner in contrast with ordinary metal-oxidebased gas sensors that operate at high temperatures. We first study the detection efficacy of the Pd-MWCNT film relative to pure MWCNT film. Subsequently, we investigate the Pd-MWCNT sensor's sensitivity over time for different gas concentrations, the sensor response time, and sensor reproducibility and reliability under various conditions including bending tests. Our sensor exhibits stable reliable detection characteristics and excellent structural flexibility.
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Affiliation(s)
- Maeum Han
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Jae Keon Kim
- AI System Engineering Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
| | - Junyeop Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Hee Kyung An
- Mechatronics Technology Convergence R&D Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
| | - Jong Pil Yun
- AI System Engineering Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Daewoong Jung
- AI System Engineering Group, Korea Institute of Industrial Technology (KITECH), Daegu 42994, Republic of Korea
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Kim O, Kwon J, Kim S, Xu B, Seo K, Park C, Do W, Bae J, Kang S. Effect of PVP-Capped ZnO Nanoparticles with Enhanced Charge Transport on the Performance of P3HT/PCBM Polymer Solar Cells. Polymers (Basel) 2019; 11:polym11111818. [PMID: 31694327 PMCID: PMC6918335 DOI: 10.3390/polym11111818] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 09/03/2019] [Revised: 10/25/2019] [Accepted: 10/28/2019] [Indexed: 11/17/2022] Open
Abstract
We attempted surface modification in ZnO nanoparticles (NPs) synthesized by the sol–gel process with polyvinyl pyrrolidone (PVP) applied to bulk-heterojunction polymer solar cells (PSCs) as an electron transport layer (ETL). In general, ZnO NPs have trap sites due to oxygen vacancies which capture electrons and degrade the performance of the PSCs. Devices with six different PVP:Zn ratios (0.615 g, 1.230 g, 1.846 g, 2.460 g, 3.075 g, and 3.690 g) were fabricated for surface modification, and the optimized PVP:Zn ratio (2.460 g) was found for PSCs based on P3HT/PCBM. The power conversion efficiency (PCE) of the fabricated PSCs with PVP-capped ZnO exhibited a significant increase of approximately 21% in PCE and excellent air-stability as compared with the uncapped ZnO-based PSCs.
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Affiliation(s)
- OkSik Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
| | - JinBeom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
| | - SaeWan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
| | - Binrui Xu
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
| | - KyeongHo Seo
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
| | - CheolEon Park
- Center for Robotics Research, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Korea;
| | - WooJong Do
- Department of Sensor and Display Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea;
| | - JinHyuk Bae
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
| | - ShinWon Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Korea; (O.K.); (J.K.); (S.K.); (B.X.); (K.S.); (J.B.)
- Correspondence: ; Tel.: +82-53-950-6829
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6
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Lee KH, Kwon YE, Lee H, Lee Y, Seo J, Kwon O, Kang SW, Lee D. Active Body Pressure Relief System with Time-of-Flight Optical Pressure Sensors for Pressure Ulcer Prevention. Sensors (Basel) 2019; 19:s19183862. [PMID: 31500195 PMCID: PMC6766802 DOI: 10.3390/s19183862] [Citation(s) in RCA: 9] [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: 08/14/2019] [Revised: 09/02/2019] [Accepted: 09/04/2019] [Indexed: 11/16/2022]
Abstract
A body pressure relief system was newly developed with optical pressure sensors for pressure ulcer prevention. Unlike a conventional alternating pressure air mattress (APAM), this system automatically regulates air flow into a body supporting mattress with adaptive inflation (or deflation) duration in response to the pressure level in order to reduce skin stress due to prolonged high pressures. The system continuously quantifies the body pressure distribution using time-of-flight (ToF) optical sensors. The proposed pressure sensor, a ToF optical sensor in the air-filled cell, measures changes in surface height of mattress when pressed under body weight, thereby indirectly indicating the interface pressure. Non-contact measurement of optical sensor usually improves the durability and repeatability of the system. The pressure sensor was successfully identified the 4 different-predefined postures, and quantitatively measured the body pressure distribution of them. Duty cycle of switches in solenoid valves was adjusted to 0–50% for pressure relief, which shows that the interface pressure was lower than 32 mmHg for pressure ulcer prevention.
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Affiliation(s)
- Kang-Ho Lee
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea
| | - Yeong-Eun Kwon
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea
| | - Hyukjin Lee
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea
| | - Yongkoo Lee
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea
| | - Joonho Seo
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea
| | - Ohwon Kwon
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu 41566, Korea.
| | - Dongkyu Lee
- Daegu Research Center for Medical Devices, Korea institute of Machinery and Materials, Daegu 42994, Korea.
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Kang SW, Park JH, Kim SH, Seo DC, Ok YS, Cho JS. Establishment of optimal barley straw biochar application conditions for rice cultivation in a paddy field. Environ Geochem Health 2019; 41:1793-1803. [PMID: 28845510 DOI: 10.1007/s10653-017-0009-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 07/24/2017] [Indexed: 06/07/2023]
Abstract
This study was conducted to establish the optimal application conditions of barley straw biochar (BC) for rice cultivation and to determine the effects of combined application of BC and inorganic fertilizer (IF) on rice cultivation in a paddy field. Based on the characteristics of rice growth in pot-based experiments, the selected optimal application conditions of BC were application of 20 ton ha-1 at 14 days before rice transplanting. The effects of BC application on rice cultivation in a paddy field when using those conditions were then evaluated. Each treatment was separated by a control (Cn), IF, BC, and combined BC + IF treatments, respectively. The rice yields in the BC + IF treatment were 38.6, 21.7, and 24.5% greater than those in the Cn, IF, and BC treatments, respectively. In addition, yield components of rice were significantly improved in the BC + IF treatment relative to the other treatments. Following rice harvest, soil status was improved, showing greater soil aggregation stability, decreased bulk density, and increased porosity in the BC-treated areas compared to those in the Cn- and IF-treated areas. At the time of rice harvesting, soil chemical properties such as pH, EC, SOC, TN, Avail. P2O5, and CEC in the BC-treated areas were improved over those in other areas. The results of this study indicate that using BC as a soil amendment is effective at improving rice cultivation and can benefit the soil environment.
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Affiliation(s)
- S W Kang
- Department of Bio-environmental Sciences, Sunchon National University, Suncheon, 57922, Republic of Korea
| | - J H Park
- School of Plant, Environmental, and Soil Sciences, Louisiana State University AgCenter, Baton Rouge, LA, 70803, USA
| | - S H Kim
- Division of Applied Life Science (BK21 Program) and Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - D C Seo
- Division of Applied Life Science (BK21 Program) and Institute of Agriculture and Life Science, Gyeongsang National University, Jinju, 52828, Republic of Korea
| | - Y S Ok
- O-Jeong Eco-Resilience Institute (OJERI) and Division of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - J S Cho
- Department of Bio-environmental Sciences, Sunchon National University, Suncheon, 57922, Republic of Korea.
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Lee JS, Kang BH, Kim SW, Kwon JB, Kim OS, Byun YT, Kwon DH, Bae JH, Kang SW. Al atomistic surface modulation on colloidal gradient quantum dots for high-brightness and stable light-emitting devices. Sci Rep 2019; 9:6357. [PMID: 31015572 PMCID: PMC6478915 DOI: 10.1038/s41598-019-42925-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [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: 12/18/2018] [Accepted: 04/10/2019] [Indexed: 11/09/2022] Open
Abstract
Quantum-dot (QD) light-emitting devices (QLEDs) have been attracting considerable attention owing to the unique properties of process, which can control the emission wavelength by controlling the particle size, narrow emission bandwidth, and high brightness. Although there have been rapid advances in terms of luminance and efficiency improvements, the long-term device stability is limited by the low chemical stability and photostability of the QDs against moisture and air. In this study, we report a simple method, which can for enhance the long-term stability of QLEDs against oxidation by inserting Al into the shells of CdSe/ZnS QDs. The Al coated on the ZnS shell of QDs act as a protective layer with Al2O3 owing to photo-oxidation, which can prevents the photodegradation of QD with prolonged irradiation and stabilize the device during a long-term operation. The QLEDs fabricated using CdSe/ZnS/Al QDs exhibited a maximum luminance of 57,580 cd/m2 and current efficiency of 5.8 cd/A, which are significantly more than 1.6 times greater than that of CdSe/ZnS QDs. Moreover, the lifetimes of the CdSe/ZnS/Al-QD-based QLEDs were significantly improved owing to the self-passivation at the QD surfaces.
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Affiliation(s)
- Jae-Sung Lee
- Sensor System Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Byoung-Ho Kang
- Institute of Technology, DONG-A CARBON TECHNOLOGY, 41-3, Gyo 8-Gil, Buksam-eub, Chilgok-gun, Gyeongsangbuk-do, Republic of Korea
| | - Sae-Wan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701, Daegu, Republic of Korea
| | - Jin-Beom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701, Daegu, Republic of Korea
| | - Ok-Sik Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701, Daegu, Republic of Korea
| | - Young Tae Byun
- Sensor System Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Dae-Hyuk Kwon
- Department of Electronic Engineering, Kyungil University, Hayang-up, 712-702, Gyeongsang buk-do, Republic of Korea
| | - Jin-Hyuk Bae
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701, Daegu, Republic of Korea
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701, Daegu, Republic of Korea.
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Xu B, Sai-Anand G, Jeong HM, Kim SW, Kim JS, Kwon JB, Kang SW. Improving Air-Stability and Performance of Bulk Heterojunction Polymer Solar Cells Using Solvent Engineered Hole Selective Interlayer. Materials (Basel) 2018; 11:E1143. [PMID: 29976901 PMCID: PMC6073352 DOI: 10.3390/ma11071143] [Citation(s) in RCA: 14] [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: 06/12/2018] [Revised: 06/29/2018] [Accepted: 07/04/2018] [Indexed: 11/26/2022]
Abstract
In bulk heterojunction polymer solar cells (BHJ-PSCs), poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) is the most commonly used hole selective interlayer (HSIL). However, its acidity, hygroscopic nature, and the use of indium tin oxide (ITO) etching can degrade the overall photovoltaic performance and the air-stability of BHJ-PSCs. Solvent engineering is considered as a facile approach to overcome these issues. In this work, we engineered the HSIL using ethanol (ET) treated PEDOT:PSS to simultaneously enhance the photovoltaic performance properties and air-stability of the fabricated devices. We systematically investigated the influence of ET on the microstructural, morphological, interfacial characteristics of modified HSIL and photovoltaic characteristics of BHJ-PSCs. Compared with the BHJ-PSC with pristine PEDOT:PSS, a significant enhancement of power conversion efficiency (~17%) was witnessed for the BHJ-PSC with PEDOT:PSS-ET (v/v, 1:0.5). Consequently, the BHJ-PSC with PEDOT:PSS-ET (v/v, 1:0.5) as HSIL exhibited remarkably improved air-stability.
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Affiliation(s)
- Binrui Xu
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Gopalan Sai-Anand
- Global Innovative Center for Advanced Nanomaterials, Faculty of Engineering and Built Environment, University of Newcastle, Callaghan Campus, New South Wales 2298, Australia.
| | - Hyun-Min Jeong
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Sae-Wan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Ju-Seong Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Jin-Beom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
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Xu B, Sai-Anand G, Gopalan AI, Qiao Q, Kang SW. Improving Photovoltaic Properties of P3HT:IC 60BA through the Incorporation of Small Molecules. Polymers (Basel) 2018; 10:E121. [PMID: 30966157 PMCID: PMC6415164 DOI: 10.3390/polym10020121] [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: 01/08/2018] [Revised: 01/22/2018] [Accepted: 01/24/2018] [Indexed: 11/19/2022] Open
Abstract
We investigated the role of a functional solid additive, 2,3-dihydroxypyridine (DHP), in influencing the optoelectronic, morphological, structural and photovoltaic properties of bulk-heterojunction-based polymer solar cells (BHJ PSCs) fabricated using poly(3-hexylthiophene): indene-C60 bisadduct (P3HT:IC60BA) photoactive medium. A dramatic increase in the power conversion efficiency (~20%) was witnessed for the BHJ PSCs treated with DHP compared to the pristine devices. A plausible explanation describing the alignment of pyridine moieties of DHP with the indene side groups of IC60BA is presented with a view to improving the performance of the BHJ PSCs via improved crystalline order and hydrophobicity changes.
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Affiliation(s)
- Binrui Xu
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Gopalan Sai-Anand
- Global Innovative Center for Advanced Nanomaterials, Faculty of Engineering and Built Environment, University of Newcastle, Callaghan, NSW 2298, Australia.
- Future Industries Institute, Division of Information Technology, Engineering and Environment, University of South Australia, Mawson Lakes, SA 5095, Australia.
| | - Anantha-Iyengar Gopalan
- Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu 41566, Korea.
| | - Qiquan Qiao
- Center for Advanced Photovoltaics, Department of Electrical Engineering and Computer Science, South Dakota State University, Brookings, SD 570007, USA.
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
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Nagarajan G, Jurkevich A, Kang SW, Kuenzel WJ. Anatomical and functional implications of corticotrophin-releasing hormone neurones in a septal nucleus of the avian brain: an emphasis on glial-neuronal interaction via V1a receptors in vitro. J Neuroendocrinol 2017; 29. [PMID: 28614607 DOI: 10.1111/jne.12494] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/31/2017] [Accepted: 06/09/2017] [Indexed: 01/30/2023]
Abstract
Previously, we showed that corticotrophin-releasing hormone immunoreactive (CRH-IR) neurones in a septal structure are associated with stress and the hypothalamic-pituitary-adrenal axis in birds. In the present study, we focused upon CRH-IR neurones located within the septal structure called the nucleus of the hippocampal commissure (NHpC). Immunocytochemical and gene expression analyses were used to identify the anatomical and functional characteristics of cells within the NHpC. A comparative morphometry analysis showed that CRH-IR neurones in the NHpC were significantly larger than CRH-IR parvocellular neurones in the paraventricular nucleus of the hypothalamus (PVN) and lateral bed nucleus of the stria terminalis. Furthermore, these large neurones in the NHpC usually have more than two processes, showing characteristics of multipolar neurones. Utilisation of an organotypic slice culture method enabled testing of how CRH-IR neurones could be regulated within the NHpC. Similar to the PVN, CRH mRNA levels in the NHpC were increased following forskolin treatment. However, dexamethasone decreased forskolin-induced CRH gene expression only in the PVN and not in the NHpC, indicating differential inhibitory mechanisms in the PVN and the NHpC of the avian brain. Moreover, immunocytochemical evidence also showed that CRH-IR neurones reside in the NHpC along with the vasotocinergic system, comprising arginine vasotocin (AVT) nerve terminals and immunoreactive vasotocin V1a receptors (V1aR) in glia. Hence, we hypothesised that AVT acts as a neuromodulator within the NHpC to modulate activity of CRH neurones via glial V1aR. Gene expression analysis of cultured slices revealed that AVT treatment increased CRH mRNA levels, whereas a combination of AVT and a V1aR antagonist treatment decreased CRH mRNA expression. Furthermore, an attempt to identify an intercellular mechanism in glial-neuronal communication in the NHpC revealed that brain-derived neurotrophic factor (BDNF) and its receptor (TrkB) could be involved in the signalling mechanism. Immunocytochemical results further showed that both BDNF and TrkB receptors were found in glia of the NHpC. Interestingly, in cultured brain slices containing the NHpC, the use of a selective TrkB antagonist decreased the AVT-induced increase in CRH gene expression levels. The results from the present study collectively suggest that CRH neuronal activity is modulated by AVT via V1aR involving BDNF and TrkB glia in the NHpC.
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Affiliation(s)
- G Nagarajan
- The Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR, USA
| | - A Jurkevich
- Molecular Cytology Research Core Facility, University of Missouri, Columbia, MO, USA
| | - S W Kang
- The Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR, USA
| | - W J Kuenzel
- The Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR, USA
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12
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Park MS, Kim SK, Park HJ, Seok H, Kang SW, Lee SH, Kim YG, Moon JY, Kim TH, Kim YH, Kang SW, Chung JH, Jeong KH. Association Studies of Bone Morphogenetic Protein 2 Gene Polymorphisms With Acute Rejection in Kidney Transplantation Recipients. Transplant Proc 2017; 49:1012-1017. [PMID: 28583517 DOI: 10.1016/j.transproceed.2017.03.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Bone morphogenetic proteins (BMP) belong to the transforming growth factor beta superfamily of proteins. This study was performed to evaluate the association of BMP gene polymorphisms with acute renal allograft rejection (AR) and graft dysfunction (GD) in Koreans. METHODS Three hundred thirty-one patients who had kidney transplantation procedures were recruited. Transplantation outcomes were determined in terms of AR and GD criteria. We selected six single nucleotide polymorphisms (SNPs): rs1979855 (5' near gene), rs1049007 (Ser87Ser), rs235767 (intron), rs1005464 (intron), rs235768 (Arg190Ser), and rs3178250 (3; untranslated region). RESULTS Among the six SNPs tested, the rs235767, rs1005464, and rs3178250 SNPs were significantly associated with AR (P < .05). The rs1049007 and rs235768 SNPs also showed an association with GD (P < .05). CONCLUSIONS In conclusion, these results suggest that the BMP2 gene polymorphism may be related to the development of AR and GD in kidney transplant recipients.
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Affiliation(s)
- M-S Park
- Department of Surgery, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S K Kim
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - H J Park
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - H Seok
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S W Kang
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S H Lee
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Y G Kim
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - J Y Moon
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - T H Kim
- Department of Nephrology, School of Medicine, In Je University, Busan, Republic of Korea
| | - Y H Kim
- Department of Nephrology, School of Medicine, In Je University, Busan, Republic of Korea
| | - S W Kang
- Department of Nephrology, School of Medicine, In Je University, Busan, Republic of Korea
| | - J-H Chung
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
| | - K H Jeong
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
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13
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Kim SW, Lee JS, Lee SW, Kang BH, Kwon JB, Kim OS, Kim JS, Kim ES, Kwon DH, Kang SW. Easy-to-Fabricate and High-Sensitivity LSPR Type Specific Protein Detection Sensor Using AAO Nano-Pore Size Control. Sensors (Basel) 2017; 17:s17040856. [PMID: 28406469 PMCID: PMC5424733 DOI: 10.3390/s17040856] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 04/11/2017] [Accepted: 04/12/2017] [Indexed: 12/16/2022]
Abstract
In this study, we developed a pore size/pore area-controlled optical biosensor-based anodic aluminum oxide (AAO) nanostructure. As the pore size of AAO increases, the unit cell of AAO increases, which also increases the non-pore area to which the antibody binds. The increase in the number of antibodies immobilized on the surface of the AAO enables effective detection of trace amounts of antigen, because increased antigen-antibody bonding results in a larger surface refractive index change. High sensitivity was thus achieved through amplification of the interference wave of two vertically-incident reflected waves through the localized surface plasmon resonance phenomenon. The sensitivity of the fabricated sensor was evaluated by measuring the change in wavelength with the change in the refractive index of the device surface, and sensitivity was increased with increasing pore-size and non-pore area. The sensitivity of the fabricated sensor was improved and up to 11.8 ag/mL serum amyloid A1 antigen was detected. In addition, the selectivity of the fabricated sensor was confirmed through a reaction with a heterogeneous substance, C-reactive protein antigen. By using hard anodization during fabrication of the AAO, the fabrication time of the device was reduced and the AAO chip was fabricated quickly and easily.
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Affiliation(s)
- Sae-Wan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
| | - Jae-Sung Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
| | - Sang-Won Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
| | - Byoung-Ho Kang
- Division of Advanced Research and Development, SINOKOR, 12 Seongseogongdanbuk-ro 43-gil, Dalseo-gu, Daegu 704-920, Korea.
| | - Jin-Beom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
| | - Ok-Sik Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
| | - Ju-Seong Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
| | - Eung-Soo Kim
- Division of Computer and Electronic Engineering, Pusan University of Foreign studies, 65 Namsan-dong, Geumjeong-gu, 608-738 Busan, Korea.
| | - Dae-Hyuk Kwon
- Department of Electronics Engineering, Kyungil University, Hayang-up, Gyeongsang buk-do 712-702, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, Korea.
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14
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Xu B, Gopalan SA, Gopalan AI, Muthuchamy N, Lee KP, Lee JS, Jiang Y, Lee SW, Kim SW, Kim JS, Jeong HM, Kwon JB, Bae JH, Kang SW. Functional solid additive modified PEDOT:PSS as an anode buffer layer for enhanced photovoltaic performance and stability in polymer solar cells. Sci Rep 2017; 7:45079. [PMID: 28338088 PMCID: PMC5364469 DOI: 10.1038/srep45079] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [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: 10/27/2016] [Accepted: 02/17/2017] [Indexed: 12/02/2022] Open
Abstract
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability and restricted photovoltaic (PV) performance for the fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been used in the PEDOT: PSS buffer layer to obtain modified properties for PEDOT: PSS@DOH and achieve high PV performances. The electrical conductivity of PEDOT:PSS@DOH films was markedly improved compared with that of PEDOT:PSS. The PEDOT:PSS@DOH film exhibited excellent optical characteristics, appropriate work function alignment, and good surface properties in BHJ-PSCs. When a poly(3-hexylthiohpene):[6,6]-phenyl C61-butyric acid methyl ester blend system was applied as the photoactive layer, the power conversion efficiency of the resulting PSCs with PEDOT:PSS@DOH(1.0%) reached 3.49%, outperforming pristine PEDOT:PSS, exhibiting a power conversion enhancement of 20%. The device fabricated using PEDOT:PSS@DOH (1.0 wt%) also exhibited improved thermal and air stability. Our results also confirm that DOH, a basic pyridine derivative, facilitates adequate hydrogen bonding interactions with the sulfonic acid groups of PSS, induces the conformational transformation of PEDOT chains and contributes to the phase separation between PEDOT and PSS chains.
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Affiliation(s)
- Binrui Xu
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Sai-Anand Gopalan
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea.,Division of Information Technology, Future Industries Institute, Engineering and Environment, University of South Australia, Mawson Lakes, 5095, South Australia
| | - Anantha-Iyengar Gopalan
- Research Institute of Advanced Energy Technology, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea.,Department of Chemistry Education, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Nallal Muthuchamy
- Department of Chemistry Education, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Kwang-Pill Lee
- Research Institute of Advanced Energy Technology, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea.,Department of Chemistry Education, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Jae-Sung Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Yu Jiang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Sang-Won Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Sae-Wan Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Ju-Seong Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Hyun-Min Jeong
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Jin-Beom Kwon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Jin-Hyuk Bae
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566, Daegu, Korea.
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15
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Lee HJ, Kim TH, Kang SW, Kim YH, Kim SK, Chung JH, Kim YG, Moon JY, Lee SH, Ihm CG, Lee TW, Jeong KH. Association Interleukin-4 and Interleukin-4 Receptor Gene Polymorphism and Acute Rejection and Graft Dysfunction After Kidney Transplantation. Transplant Proc 2017; 48:813-9. [PMID: 27234743 DOI: 10.1016/j.transproceed.2015.12.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 11/25/2015] [Accepted: 12/30/2015] [Indexed: 11/15/2022]
Abstract
BACKGROUND Cytokine genotypes have previously been studied in patients undergoing solid organ transplantation; certain polymorphisms have been implicated in the development of acute rejection (AR) and graft dysfunction (GD). Allograft outcomes determined, in part, by alloimmune responses is mainly mediated by T-cell responses, activated and driven by cytokines. Interleukin-4 (IL-4) is one such cytokine, which exerts its biological effects through binding to the IL-4 receptor (IL-4R) complex on target cells. In the present study, we investigated whether polymorphisms of the IL-4 and/or IL-4R gene were associated with susceptibility to acute AR and GD after kidney transplantation. METHODS We analyzed 2 single nucleotide polymorphism (SNPs) of IL-4 (rs2243250 and rs2070874) and 3 SNPs of IL-4R (rs1801275, rs2107356, and rs1805010) in 344 kidney transplant recipients. These patients included 62 of whom had developed AR and 215 of whom had GD in 1 year after kidney transplantation. RESULTS The AR group included 62 patients (45 men and 17 women). There was a statistically significant difference in the male-to-female ratio and the use of tacrolimus in the AR group. The GD group included 215 patients. Patients who developed GD were more likely to be older and have an underlying cause of end-stage renal disease that was unknown compared with patients who did not have GD, the cause of which was typically known. Among the SNPs examined, 1 of the SNPs in the IL-4R gene (ie, rs1801275) showed a statistical association with AR (co-dominant model, P = .061; dominant model, P = .019; and log-addictive model, P = .029). In addition, 1 of the IL-4R SNPs (ie, rs2107356) was statistically associated with GD (dominant model, P = .034). No significant difference in the IL-4 genotype was observed between the AR/GD and non-AR/non-GD subjects. CONCLUSIONS One IL-4R gene polymorphism (rs1801275) was associated with AR. In addition, a separate IL-4R SNP (rs2107356) was statistically associated with GD after kidney transplantation.
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Affiliation(s)
- H J Lee
- Department of Nephrology, Seoul Red Cross Hospital, Seoul, Republic of Korea
| | - T H Kim
- Department of Nephrology, School of Medicine, Inje University, Busan, Republic of Korea
| | - S W Kang
- Department of Nephrology, School of Medicine, Inje University, Busan, Republic of Korea
| | - Y H Kim
- Department of Nephrology, School of Medicine, Inje University, Busan, Republic of Korea
| | - S K Kim
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - J-H Chung
- Kohwang Medical Research Institute, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Y G Kim
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - J Y Moon
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - S H Lee
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - C G Ihm
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - T W Lee
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - K H Jeong
- Department of Nephrology, School of Medicine, Kyung Hee University, Seoul, Republic of Korea.
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16
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Khan MRR, Kang SW. Highly Sensitive and Wide-Dynamic-Range Multichannel Optical-Fiber pH Sensor Based on PWM Technique. Sensors (Basel) 2016; 16:E1885. [PMID: 27834865 PMCID: PMC5134544 DOI: 10.3390/s16111885] [Citation(s) in RCA: 10] [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] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 11/03/2016] [Accepted: 11/04/2016] [Indexed: 12/13/2022]
Abstract
In this study, we propose a highly sensitive multichannel pH sensor that is based on an optical-fiber pulse width modulation (PWM) technique. According to the optical-fiber PWM method, the received sensing signal's pulse width changes when the optical-fiber pH sensing-element of the array comes into contact with pH buffer solutions. The proposed optical-fiber PWM pH-sensing system offers a linear sensing response over a wide range of pH values from 2 to 12, with a high pH-sensing ability. The sensitivity of the proposed pH sensor is 0.46 µs/pH, and the correlation coefficient R² is approximately 0.997. Additional advantages of the proposed optical-fiber PWM pH sensor include a short/fast response-time of about 8 s, good reproducibility properties with a relative standard deviation (RSD) of about 0.019, easy fabrication, low cost, small size, reusability of the optical-fiber sensing-element, and the capability of remote sensing. Finally, the performance of the proposed PWM pH sensor was compared with that of potentiometric, optical-fiber modal interferometer, and optical-fiber Fabry-Perot interferometer pH sensors with respect to dynamic range width, linearity as well as response and recovery times. We observed that the proposed sensing systems have better sensing abilities than the above-mentioned pH sensors.
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Affiliation(s)
- Md Rajibur Rahaman Khan
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
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17
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Khan MRR, Kang SW. Highly Sensitive Temperature Sensors Based on Fiber-Optic PWM and Capacitance Variation Using Thermochromic Sensing Membrane. Sensors (Basel) 2016; 16:s16071064. [PMID: 27409620 PMCID: PMC4970111 DOI: 10.3390/s16071064] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 06/01/2016] [Revised: 07/04/2016] [Accepted: 07/06/2016] [Indexed: 11/16/2022]
Abstract
In this paper, we propose a temperature/thermal sensor that contains a Rhodamine-B sensing membrane. We applied two different sensing methods, namely, fiber-optic pulse width modulation (PWM) and an interdigitated capacitor (IDC)-based temperature sensor to measure the temperature from 5 °C to 100 °C. To the best of our knowledge, the fiber-optic PWM-based temperature sensor is reported for the first time in this study. The proposed fiber-optic PWM temperature sensor has good sensing ability; its sensitivity is ~3.733 mV/°C. The designed temperature-sensing system offers stable sensing responses over a wide dynamic range, good reproducibility properties with a relative standard deviation (RSD) of ~0.021, and the capacity for a linear sensing response with a correlation coefficient of R² ≈ 0.992 over a wide sensing range. In our study, we also developed an IDC temperature sensor that is based on the capacitance variation principle as the IDC sensing element is heated. We compared the performance of the proposed temperature-sensing systems with different fiber-optic temperature sensors (which are based on the fiber-optic wavelength shift method, the long grating fiber-optic Sagnac loop, and probe type fiber-optics) in terms of sensitivity, dynamic range, and linearity. We observed that the proposed sensing systems have better sensing performance than the above-mentioned sensing system.
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Affiliation(s)
- Md Rajibur Rahaman Khan
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
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18
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Khan MRR, Khalilian A, Kang SW. A High Sensitivity IDC-Electronic Tongue Using Dielectric/Sensing Membranes with Solvatochromic Dyes. Sensors (Basel) 2016; 16:s16050668. [PMID: 27171095 PMCID: PMC4883359 DOI: 10.3390/s16050668] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 04/21/2016] [Accepted: 05/04/2016] [Indexed: 11/17/2022]
Abstract
In this paper, an electronic tongue/taste sensor array containing different interdigitated capacitor (IDC) sensing elements to detect different types of tastes, such as sweetness (glucose), saltiness (NaCl), sourness (HCl), bitterness (quinine-HCl), and umami (monosodium glutamate) is proposed. We present for the first time an IDC electronic tongue using sensing membranes containing solvatochromic dyes. The proposed highly sensitive (30.64 mV/decade sensitivity) IDC electronic tongue has fast response and recovery times of about 6 s and 5 s, respectively, with extremely stable responses, and is capable of linear sensing performance (R2 ≈ 0.985 correlation coefficient) over the wide dynamic range of 1 µM to 1 M. The designed IDC electronic tongue offers excellent reproducibility, with a relative standard deviation (RSD) of about 0.029. The proposed device was found to have better sensing performance than potentiometric-, cascoded compatible lateral bipolar transistor (C-CLBT)-, Electronic Tongue (SA402)-, and fiber-optic-based taste sensing systems in what concerns dynamic range width, response time, sensitivity, and linearity. Finally, we applied principal component analysis (PCA) to distinguish between various kinds of taste in mixed taste compounds.
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Affiliation(s)
- Md Rajibur Rahaman Khan
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Alireza Khalilian
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
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19
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Kang H, Choi HJ, Kang SW, Shin SE, Choi GS, Bae DH. Multi-functional magnesium alloys containing interstitial oxygen atoms. Sci Rep 2016; 6:23184. [PMID: 26976372 PMCID: PMC4791639 DOI: 10.1038/srep23184] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [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: 10/28/2015] [Accepted: 02/22/2016] [Indexed: 11/26/2022] Open
Abstract
A new class of magnesium alloys has been developed by dissolving large amounts of oxygen atoms into a magnesium lattice (Mg-O alloys). The oxygen atoms are supplied by decomposing titanium dioxide nanoparticles in a magnesium melt at 720 °C; the titanium is then completely separated out from the magnesium melt after solidification. The dissolved oxygen atoms are located at the octahedral sites of magnesium, which expand the magnesium lattice. These alloys possess ionic and metallic bonding characteristics, providing outstanding mechanical and functional properties. A Mg-O-Al casting alloy made in this fashion shows superior mechanical performance, chemical resistance to corrosion, and thermal conductivity. Furthermore, a similar Mg-O-Zn wrought alloy shows high elongation to failure (>50%) at room temperature, because the alloy plastically deforms with only multiple slips in the sub-micrometer grains (<300 nm) surrounding the larger grains (~15 μm). The metal/non-metal interstitial alloys are expected to open a new paradigm in commercial alloy design.
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Affiliation(s)
- H Kang
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul, 120-749, Korea
| | - H J Choi
- Department of Advanced Material Engineering, Kookmin University,77 Jeongneung-ro Seongbuk-gu, Seoul, 136-702, Korea
| | - S W Kang
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul, 120-749, Korea
| | - S E Shin
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul, 120-749, Korea
| | - G S Choi
- Gangwon Research Institute Technology Research Center, 290 Daejeon-dong, Gangneung, 210-340 Korea
| | - D H Bae
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong Seodaemun-gu, Seoul, 120-749, Korea
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20
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Khan MRR, Khalilian A, Kang SW. Fast, Highly-Sensitive, and Wide-Dynamic-Range Interdigitated Capacitor Glucose Biosensor Using Solvatochromic Dye-Containing Sensing Membrane. Sensors (Basel) 2016; 16:265. [PMID: 26907291 PMCID: PMC4801641 DOI: 10.3390/s16020265] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Revised: 02/09/2016] [Accepted: 02/18/2016] [Indexed: 11/16/2022]
Abstract
In this paper, we proposed an interdigitated capacitor (IDC)-based glucose biosensor to measure different concentrations of glucose from 1 μM to 1 M. We studied four different types of solvatochromic dyes: Auramine O, Nile red, Rhodamine B, and Reichardt's dye (R-dye). These dyes were individually incorporated into a polymer [polyvinyl chloride (PVC)] and N,N-Dimethylacetamide (DMAC) solution to make the respective dielectric/sensing materials. To the best of our knowledge, we report for the first time an IDC glucose biosensing system utilizing a solvatochromic-dye-containing sensing membrane. These four dielectric or sensing materials were individually placed into the interdigitated electrode (IDE) by spin coating to make four IDC glucose biosensing elements. The proposed IDC glucose biosensor has a high sensing ability over a wide dynamic range and its sensitivity was about 23.32 mV/decade. It also has fast response and recovery times of approximately 7 s and 5 s, respectively, excellent reproducibility with a standard deviation of approximately 0.023, highly stable sensing performance, and real-time monitoring capabilities. The proposed IDC glucose biosensor was compared with an IDC, potentiometric, FET, and fiber-optic glucose sensor with respect to response time, dynamic range width, sensitivity, and linearity. We observed that the designed IDC glucose biosensor offered excellent performance.
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Affiliation(s)
- Md Rajibur Rahaman Khan
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Alireza Khalilian
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea.
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Lee SW, Cha SH, Choi KJ, Kang BH, Lee JS, Kim SW, Kim JS, Jeong HM, Gopalan SA, Kwon DH, Kang SW. Low Dark-Current, High Current-Gain of PVK/ZnO Nanoparticles Composite-Based UV Photodetector by PN-Heterojunction Control. Sensors (Basel) 2016; 16:s16010074. [PMID: 26751453 PMCID: PMC4732107 DOI: 10.3390/s16010074] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 12/21/2015] [Accepted: 01/04/2016] [Indexed: 11/23/2022]
Abstract
We propose a solution-processable ultraviolet (UV) photodetector with a pn-heterojunction hybrid photoactive layer (HPL) that is composed of poly-n-vinylcarbazole (PVK) as a p-type polymer and ZnO nanoparticles (NPs) as an n-type metal oxide. To observe the effective photo-inducing ability of the UV photodetector, we analyzed the optical and electrical properties of HPL which is controlled by the doping concentration of n-type ZnO NPs in PVK matrix. Additionally, we confirmed that the optical properties of HPL dominantly depend on the ZnO NPs from the UV-vis absorption and the photoluminescence (PL) spectral measurements. This HPL can induce efficient charge transfer in the localized narrow pn-heterojunction domain and increases the photocurrent gain. It is essential that proper doping concentration of n-type ZnO NPs in polymer matrix is obtained to improve the performance of the UV photodetector. When the ZnO NPs are doped with the optimized concentration of 3.4 wt.%, the electrical properties of the photocurrent are significantly increased. The ratio of the photocurrent was approximately 103 higher than that of the dark current.
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Affiliation(s)
- Sang-Won Lee
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Seung-Hwan Cha
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Kyung-Jae Choi
- Department of Sensor and Display Engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Byoung-Ho Kang
- Center for Functional Devices Fusion Platform, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Jae-Sung Lee
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Sae-Wan Kim
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Ju-Seong Kim
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Hyun-Min Jeong
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Sai-Anand Gopalan
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
| | - Dae-Hyuk Kwon
- Department of Electronics Engineering, Kyungil University, 50 Gamasil-Gil, Hayang-Eup, Gyeongbuk, 38428 Gyeongsan-Si, Korea.
| | - Shin-Won Kang
- School of Electronics Engineering, College of IT engineering, Kyungpook National University, 80 Daehakro, Bukgu, 41566 Daegu, Korea.
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Abstract
Caspases (CASP) are intracellular proteases that play roles as mediators of apoptosis. Activation of caspase 3 is enhanced in chronic periodontitis. Thus, we hypothesized that single nucleotide polymorphisms (SNPs) of CASP genes might be associated with this condition in the Korean population. To investigate whether such polymorphisms might be involved in the development of periodontal disease, 51 patients and 33 control subjects were assessed. A total of 201 CASP gene SNPs were analyzed with genotypes being determined using and Axiom(TM) genome-wide human assay. SNPStats and SPSS 18.0 were used for the analysis of genetic data and logistic regression models were utilized to evaluate odds ratios, 95% confidence intervals, and P values. Of the 201 SNPs, only three (rs12108497, rs4647602, and rs113420705, all in the CASP3 gene) were significantly associated with chronic periodontitis (P < 0.05). The minor allele frequencies of these SNPs were higher in the patient group than in the control group. In addition, the TC and GT haplotypes formed by rs4647602 and rs113420705 were found to be associated with chronic this disease (TC haplotype, P = 0.0039; GT haplotype, P = 0.002). These results suggest that CASP3 gene polymorphisms may be associated with susceptibility to periodontal disease in the Korean population.
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Affiliation(s)
- S W Kang
- Kohwang Medical Institute, School of Medicine, Kyung Hee University, Seoul, Korea
| | - S K Kim
- Kohwang Medical Institute, School of Medicine, Kyung Hee University, Seoul, Korea
| | - J H Chung
- Kohwang Medical Institute, School of Medicine, Kyung Hee University, Seoul, Korea
| | - J Y Ban
- Department of Dental Pharmacology, School of Dentistry, Dankook University, Cheonan, Korea.,Department of Medical Laser, Graduate School, Dankook University, Cheonan, Korea
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Lee JS, Yoon NR, Kang BH, Lee SW, Gopalan SA, Kim SW, Lee SH, Kwon DH, Kang SW. Au-Polypyrrole Framework Nanostructures for Improved Localized Surface Plasmon Resonance Volatile Organic Compounds Gas Sensing. J Nanosci Nanotechnol 2015; 15:7738-7742. [PMID: 26726404 DOI: 10.1166/jnn.2015.11194] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper, we propose an Au-polypyrrole (Ppy) nanorod gas sensor for the detection of volatile organic compound (VOC) gases. This gas sensor operates on the principle of localized surface plasmon resonance (LSPR). The Au-Ppy nanorods used in this experiment were synthesized using an anodic aluminum oxide template by the electrochemical deposition method. Using field emission scanning electron microscopy, we confirmed that the Au-Ppy nanorod arrays were successfully fabricated with a uniform size. By depositing gold, the Au-Ppy nanorods exhibited both optical and LSPR interference. The gas sensing properties of the fabricated nanorods were tested for VOCs such as acetic acid, benzene, and toluene with a short response time (~1 min). Moreover, the proposed VOC gas sensing system was tested with three types of VOC gases over a wide concentration range from 10 to 100 ppm. Highest sensitivity was observed for acetic acid gas, which had a linear relation with the gas concentration, indicating that the system can be used as a gas sensor.
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Park SJ, Oh SH, Kang MS, Kim TH, Kang SW, Yoon YC, Kim YH. Reuse of a previously transplanted kidney from a deceased donor using Luminex virtual crossmatching: a case report. Transplant Proc 2015; 46:2083-5. [PMID: 25131112 DOI: 10.1016/j.transproceed.2014.06.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Kidney transplantation is the most desired modality of renal replacement therapy for patients with end-stage renal disease (ESRD). We have attempted to expand the organ donor pool through several methods, including the use of expanded donor criteria. Although previously transplanted kidneys are rarely reused, they can be suitable for transplantation into patients in need. We report a case of successful reuse of a previously transplanted kidney from a deceased donor by means of Luminex virtual crossmatching with the first donor and actual crossmatching with the second donor.
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Affiliation(s)
- S J Park
- Organ Transplantation Center, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea; Department of Nephrology, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea
| | - S H Oh
- Department of Laboratory Medicine, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea
| | - M S Kang
- Department of Pathology, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea
| | - T H Kim
- Department of Nephrology, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea
| | - S W Kang
- Department of Nephrology, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea
| | - Y C Yoon
- Organ Transplantation Center, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea; Department of Cardiovascular Surgery, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea
| | - Y H Kim
- Organ Transplantation Center, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea; Department of Nephrology, College of Medicine, Busan Paik Hospital, Inje University, Busan, Republic of Korea.
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Lee HG, Gopalan AI, Sai-Anand G, Kang SW, Lee KP. New Heterojunction Titanium Dioxide Nanowire as Photocatalyst. J Nanosci Nanotechnol 2015; 15:7421-7425. [PMID: 26716348 DOI: 10.1166/jnn.2015.10596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Graphene and metal nanoparticles were incorporated into titanium dioxide nanowires. The heterojunction generated in the titanium dioxide nanowires was beneficially utilized for photocatalytic degradation of Rhodamine-B.
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Kang BH, Lee SW, Lim SW, Kim JS, Sai-Anand G, Lee SH, Kwon DH, Kang SW. Enhanced Performance of Light-Emitting Diodes by Surface Ligand Modification on Quantum Dots. J Nanosci Nanotechnol 2015; 15:7169-7172. [PMID: 26716304 DOI: 10.1166/jnn.2015.10560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The electrical characteristics of quantum dots (QDs) can vary depending on the surface modulation, which can change the luminance and efficiency of electroluminescent devices. Thus, understanding surface ligand is essential in improving the performance of QDs-based light-emitting diodes (LEDs). We analyzed the performance of QDs-based LEDs with respect to the QD surface volume. On the QD surfaces, the 1.1 nm-long tryoctylphosphine oxide (TOPO) ligand with three neck-type structure was replaced with a 1.7 nm-long oleic acid (OA) ligand with a one neck-type structure to evaluate the dependence of the LED properties on the ligand length. With all other conditions being identical, the luminance and efficiency of the QDs-based LEDs with an OA ligand were approximately 1,000 cd/m2 greater and 1.5 times higher, respectively, than those of the QDs-based LEDs with a TOPO ligand. These results show that if the physical length of the surface ligand is relatively long, decreasing the surface area would result in increased injection of electrons and holes into the QDs, increasing the luminance and efficiency.
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Kang BH, Kim JS, Lee JS, Lee SW, Sai-Anand G, Jeong HM, Lee SH, Kwon DH, Kang SW. Solution Processable CdSe/ZnS Quantum Dots Light-Emitting Diodes Using ZnO Nanocrystal as Electron Transport Layer. J Nanosci Nanotechnol 2015; 15:7416-7420. [PMID: 26716347 DOI: 10.1166/jnn.2015.10542] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In this paper, we propose interface engineering between cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots (QDs) as the emissive layer (EML) and ZnO nanocrystals (NCs) as the electron transport layer (ETL) for reducing the potential barrier in QDs based light-emitting diode (QLED). The n-type ZnO NCs were effective in confining charge to the QDs EML because of their wide band gap. The ZnO NCs were synthesized using a modified sol-gel process and were applied as the ETL in QLED. For comparison, a standard QLED with Tris(8-hydroxyquinolinato)aluminium as the ETL was also fabricated. The standard QLED was shown to have a luminance of 11,240 cd/m2 and current efficiency of 2.3 cd/A. However, QLED with ZnO NCs showed a higher luminance of 28,760 cd/m2 and current efficiency of 4.9 cd/A than the reference structure, and so has more efficient charge transport. Thus, QLED with ZnO NCs not only simplified the process, but also enhanced the luminance and current efficiency by factor of two.
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Sai-Anand G, Han B, Kim SW, Lee SW, Lee JS, Jeong HM, Kang SW. Incorporation of Gold Nanodots Into Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonate) for an Efficient Anode Interfacial Layer for Improved Plasmonic Organic Photovoltaics. J Nanosci Nanotechnol 2015; 15:7092-7098. [PMID: 26716289 DOI: 10.1166/jnn.2015.10537] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
UNLABELLED In this paper, we demonstrate a simple strategy for the incorporation of gold nanodots (GNDs) into poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) ( PEDOT PSS) films, towards fabrication of an efficient anode interfacial layer in order to improve the performance of bulk heterojunction (BHJ) solar cells that use a blend of poly(3-hexyl thiophene) and [6,6]-phenyl-C71 butyric acid methyl ester as the organic active layer. We synthesized citrate-stabilized GNDs, with sizes in the range of -20-30 nm, by initially blending them into PEDOT PSS by aqueous dispersion. The influence of GNDs in the PEDOT PSS layer on the photovoltaic characteristics of BHJ solar cells was investigated. Our results show that the improved performance is due to the enhanced conductivity and increased interfacial contact area between the PEDOT PSS and organic active layer, owing to the inclusion of GNDs into the PEDOT PSS. The BHJ solar cell included with GNDs (0.02 wt%) into PEDOT PSS exhibited a power conversion efficiency (PCE) of 2.92% with an open circuit voltage of 0.61 V, fill factor of 50%, and a short-circuit current density of 9.51 mA/cm2, whereas the pristine device exhibited a PCE of 2.52%.
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Kim SK, Chung JH, Park HJ, Kang SW, Lim DJ, Byun SH, Baek DG, Ko HY, Lew BL, Baik HH, Sim WY. Polymorphisms in the promoter regions of the CXCL1 and CXCL2 genes contribute to increased risk of alopecia areata in the Korean population. Genet Mol Res 2015; 14:9667-74. [PMID: 26345899 DOI: 10.4238/2015.august.14.29] [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: 11/03/2022]
Abstract
Alopecia areata (AA) is a common disease, which causes hair loss in humans. AA has a genetically complex inheritance. This study investigated the possible correlations between single nucleotide polymorphisms (SNPs) in the promoter regions of the chemokine (C-X-C motif) ligand 1 (melanoma growth stimulating activity, alpha) (CXCL1) and chemokine (C-X-C motif) ligand 2 (CXCL2) genes and the development of AA in the Korean population. Two hundred and thirty-five AA patients and 240 control subjects were recruited. The specific SNPs occurring in the promoter regions of the CXCL1 and CXCL2 genes (rs3117604, -429C/T and rs3806792, -264T/C, respectively) were genotyped. All data obtained was evaluated using the SNPStats, SPSS 18.0, and the Haploview v.4.2 software platforms. The Odd's ratios (OR), 95% confidence intervals (CI), and P values were calculated using multiple logistic regression models. Analyses of the genetic sequences obtained revealed a significant correlation between the two SNPs and the development of AA (rs3117604, P = 0.0009 in co-dominant model 1, P = 0.01 in co-dominant model 2, P = 0.004 in the dominant model, P = 0.005 in the log-additive model, P = 0.012 in allele distribution; rs3806792, P = 0.036 in co-dominant model 2, P = 0.0046 in the log-additive model). The TT and CC haplotypes were also observed to show a significant association with increased risk of AA (TT haplotype, P = 0.0018; CC haplotype, P = 0.0349). Our data suggests that the CXCL1 and CXCL2 genes may be associated with AA susceptibility.
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Affiliation(s)
- S K Kim
- Kohwang Medical Research Institute, College of Medicine, Seoul, Republic of Korea
| | - J-H Chung
- Kohwang Medical Research Institute, College of Medicine, Seoul, Republic of Korea
| | - H J Park
- Kohwang Medical Research Institute, College of Medicine, Seoul, Republic of Korea
| | - S W Kang
- Kohwang Medical Research Institute, College of Medicine, Seoul, Republic of Korea
| | - D-J Lim
- Department of Biochemistry and Molecular Biology, College of Medicine, Seoul, Republic of Korea
| | - S H Byun
- Department of Biochemistry and Molecular Biology, College of Medicine, Seoul, Republic of Korea
| | - D G Baek
- Department of Biochemistry and Molecular Biology, College of Medicine, Seoul, Republic of Korea
| | - H Y Ko
- Department of Biochemistry and Molecular Biology, College of Medicine, Seoul, Republic of Korea
| | - B-L Lew
- Department of Dermatology, Kyung Hee University, College of Medicine, Seoul, Republic of Korea
| | - H H Baik
- Department of Dermatology, Kyung Hee University, College of Medicine, Seoul, Republic of Korea
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Kim JH, Kang SW, Lee EJ, Kim J, Kim SJ, Ahn J. Temporal changes in foveal contour after macular hole surgery. Eye (Lond) 2014; 28:1355-63. [PMID: 25233817 DOI: 10.1038/eye.2014.217] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 08/11/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND To investigate the changes in inner foveal contour after surgery for macular hole (MH) and its clinical implications. METHODS This retrospective observational case series included 66 eyes from 66 patients who underwent surgery for MH. Notching of tissue was defined as an abrupt alteration in the inner contour of the parafoveal tissue based on postoperative optical coherence tomography (OCT) image. The distance between the parafoveal edges of the outer plexiform layer (OPL) was defined as the inter-OPL distance. The inter-OPL distance was divided into nasal, temporal, superior, and inferior lengths. The difference in the lengths of each direction between the early and late postoperative period was compared between directions with and without notching. RESULTS The early and late postoperative examination was performed at 4.6±2.9 weeks and 6.2±0.6 months, respectively. Notching of tissue was noted in 54 eyes (81.8%). In 53 eyes with a measurable inter-OPL distance, the notching of tissue was noted in 45 eyes (84.9%) regardless of preoperative MH size. The mean amount of foveal tissue elongation that occurred during the designated period was 104.6±68.8 and 78.4±72.9 μm in the directions with and without the notching of tissue (P<0.001), respectively. CONCLUSIONS The changes in the inner foveal contour, including notching of tissue and elongation of foveal tissue, were noted in the majority of eyes after MH surgery. Notching of tissue on OCT image could be a clinical marker for the development of foveal tissue elongation after MH surgery.
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Affiliation(s)
- J H Kim
- Department of Ophthalmology, Kim's Eye Hospital, Konyang University College of Medicine, Seoul, Korea
| | - S W Kang
- Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - E J Lee
- Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J Kim
- Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S J Kim
- Department of Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J Ahn
- Department of Ophthalmology, Boramae Medical Center, Seoul, Korea
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Lee HG, Sai-Anand G, Komathi S, Gopalan AI, Kang SW, Lee KP. Efficient visible-light-driven photocatalytic degradation of nitrophenol by using graphene-encapsulated TiO₂ nanowires. J Hazard Mater 2014; 283:400-409. [PMID: 25310598 DOI: 10.1016/j.jhazmat.2014.09.014] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 08/28/2014] [Accepted: 09/01/2014] [Indexed: 06/04/2023]
Abstract
In this work, a new hybrid nanocatalyst, namely titanium dioxide (TiO2) composite nanowires, encapsulated with graphene (G) and palladium nanoparticles (Pd NPs) (designated as G-Pd@TiO2-CNWs), was prepared. In preparing the nanowires, a combination of electrospinning and hydrothermal approaches was employed. The visible-light-driven photocatalytic performance of G-Pd@TiO2-CNWs was investigated using the reduction of 4-nitrophenol (4-NP) as a model reaction. The results showed that G-Pd@TiO2-CNWs converted nearly 100% of 4-NP under visible light irradiation. The reaction kinetics of the photocatalytic reduction of 4-NP was studied by UV-vis spectrophotometry and the apparent rate constant was determined and compared with those for other supported TiO2 catalysts. Furthermore, the spent G-Pd@TiO2-CNWs could be recovered by simple centrifugation and reused. The work is expected to shed new light on the development of G-incorporated hybrid nanostructures for harvesting light energy and on the development of new photocatalysts for the removal of environmental pollutants.
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Affiliation(s)
- Hyun-Gyu Lee
- Department of Nanoscience and Nanotechnology, Kyungpook National University, Daegu, South Korea
| | - Gopalan Sai-Anand
- School of Electronics Engineering, Kyungpook National University, Daegu, South Korea
| | | | - Anantha-Iyengar Gopalan
- Department of Nanoscience and Nanotechnology, Kyungpook National University, Daegu, South Korea; Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu, South Korea
| | - Shin-Won Kang
- School of Electronics Engineering, Kyungpook National University, Daegu, South Korea.
| | - Kwang-Pill Lee
- Department of Chemistry Education, Kyungpook National University, Daegu, South Korea; Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu, South Korea.
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Sai-Anand G, Philips MF, Lee KP, Kang SW, Gopalan AL. Facile electrodeposition of flower like gold nanostructures on a conducting polymer support. J Nanosci Nanotechnol 2014; 14:3256-3261. [PMID: 24734764 DOI: 10.1166/jnn.2014.8576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Herein, we report an attractive, simple and templateless synthetic method for the formation of anisotropic gold nanostructures. Gold 'mesoflowers' consisting of arrays of nanoplatelets were synthesized by electrochemical gold deposition on/off conditions onto a conducting poly(diphenylamine) (PDPA) support matrix. A possible forming mechanism of anisotropic gold nanostructures is presented. The electronic and electrochemical properties of gold nanoflower decorated PDPA in an assembled diode configuration were evaluated.
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Kwon SJ, Park JH, Park EJ, Lee SA, Lee HS, Kang SW, Kwon J. ATM-mediated phosphorylation of the chromatin remodeling enzyme BRG1 modulates DNA double-strand break repair. Oncogene 2014; 34:303-13. [PMID: 24413084 DOI: 10.1038/onc.2013.556] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Revised: 11/15/2013] [Accepted: 11/18/2013] [Indexed: 12/25/2022]
Abstract
ATP-dependent chromatin remodeling complexes such as SWI/SNF (SWItch/Sucrose NonFermentable) have been implicated in DNA double-strand break (DSB) repair and damage responses. However, the regulatory mechanisms that control the function of chromatin remodelers in DNA damage response are largely unknown. Here, we show that ataxia telangiectasia mutated (ATM) mediates the phosphorylation of BRG1, the catalytic ATPase of the SWI/SNF complex that contributes to DSB repair by binding γ-H2AX-containing nucleosomes via interaction with acetylated histone H3 and stimulating γ-H2AX formation, at Ser-721 in response to DNA damage. ATM-mediated phosphorylation of BRG1 occurs rapidly and transiently after DNA damage. Phosphorylated BRG1 binds γ-H2AX-containing nucleosomes to form the repair foci. The Ser-721 phosphorylation of BRG1 is critical for binding γ-H2AX-containing nucleosomes and stimulating γ-H2AX formation and DSB repair. BRG1 binds to acetylated H3 peptides much better after phosphorylation at Ser-721 by DNA damage. However, the phosphorylation of Ser-721 does not significantly affect the ATPase and transcriptional activities of BRG1. These results, establishing BRG1 as a novel and functional ATM substrate, suggest that the ATM-mediated phosphorylation of BRG1 facilitates DSB repair by stimulating the association of this remodeler with γ-H2AX nucleosomes via enhancing the affinity to acetylated H3. Our work also suggests that the mechanism of BRG1 stimulation of DNA repair is independent of the remodeler's enzymatic or transcriptional activities.
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Affiliation(s)
- S-J Kwon
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
| | - J-H Park
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
| | - E-J Park
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
| | - S-A Lee
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
| | - H-S Lee
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
| | - S W Kang
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
| | - J Kwon
- Department of Life Science, College of Natural Sciences, The Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, Republic of Korea
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Lim SM, Chang H, Yoon MJ, Hong YK, Kim H, Chung WY, Park CS, Nam KH, Kang SW, Kim MK, Kim SB, Lee SH, Kim HG, Na II, Kim YS, Choi MY, Kim JG, Park KU, Yun HJ, Kim JH, Cho BC. A multicenter, phase II trial of everolimus in locally advanced or metastatic thyroid cancer of all histologic subtypes. Ann Oncol 2013; 24:3089-94. [PMID: 24050953 DOI: 10.1093/annonc/mdt379] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- S M Lim
- Department of Internal Medicine, Division of Medical Oncology, Yonsei University College of Medicine, Seoul
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Kim HR, Lee MJ, Song JE, Han JH, Yoo TH, Kang SW, Choi KH, Han SH. Drainage failure because of spontaneous fracture of the peritoneal dialysis catheter. Perit Dial Int 2013; 33:218-20. [PMID: 23478378 DOI: 10.3747/pdi.2012.00045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Khan MRR, Kang BH, Lee SW, Kim SH, Yeom SH, Lee SH, Kang SW. Fiber-optic multi-sensor array for detection of low concentration volatile organic compounds. Opt Express 2013; 21:20119-20130. [PMID: 24105558 DOI: 10.1364/oe.21.020119] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this paper, we proposed a new type high sensitive volatile organic compounds (VOCs) gas sensor array that is based on the pulse width modulation technique. Four different types of solvatochromic dyes and two different types of polymers, were used to make the five different types of sensing membranes. These were deposited on the five side-polished optical fibers by a spin coater to make the five different sensing elements of the array. In order to ascertain the effectiveness of the sensors, five VOC gases were tested. Finally, principal component analysis (PCA) has been used to discriminates different types of VOCs.
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Kim JH, Kang SW, Kim YT, Kim SJ, Chung SE. Partial posterior hyaloidectomy for macular disorders. Eye (Lond) 2013; 27:946-51. [PMID: 23743531 DOI: 10.1038/eye.2013.117] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Accepted: 04/16/2013] [Indexed: 11/09/2022] Open
Abstract
PURPOSE To evaluate the effect of partial posterior hyaloidectomy (PPH) in preventing iatrogenic retinal breaks related to the induction of a posterior vitreous detachment (IPVD). METHODS Fifty-nine patients who necessitated IPVD for an epiretinal membrane or macular hole were included in this prospective, interventional case series. Extensive removal of vitreous gel, close to the retina, was conducted before IPVD under 23 G (gauge)-vitrectomy system. The PPH involved the limited extent of IPVD and limited removal of the outermost vitreous cortex to an area slightly beyond the margin of the temporal major vascular arcade. The incidence of retinal breaks related to the surgery was compared with 57 eyes that had undergone conventional 23-G total vitrectomy accompanied by extensive IPVD using χ(2)-test. RESULTS Patients were followed-up for a mean of 14.3 months (6-30 months) after the surgery. The incidence of peripheral retinal breaks after the PPH was 3.4% (2/59 eyes), which was significantly lower than that in the eyes that underwent conventional 23 G vitrectomy (15.8%, 9/57 eyes, P=0.023) for the same disorders that required an IPVD. No patient complained of postoperative floaters, postoperatively. CONCLUSIONS PPH would be an efficient procedure to prevent iatrogenic peripheral retinal breaks related to an IPVD.
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Affiliation(s)
- J H Kim
- Department of Ophthalmology, Kim's Eye Hospital, Myung-Gok Eye Research Institute, Konyang University College of Medicine, Seoul, Korea.
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Yoon H, Oh D, Park HC, Kang SW, Han Y, Lim DH, Paik SW. Predictive factors for gastroduodenal toxicity based on endoscopy following radiotherapy in patients with hepatocellular carcinoma. Strahlenther Onkol 2013; 189:541-6. [PMID: 23703401 DOI: 10.1007/s00066-013-0343-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [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: 10/15/2012] [Accepted: 03/06/2013] [Indexed: 12/25/2022]
Abstract
PURPOSE The aim of this work was to determine predictive factors for gastroduodenal (GD) toxicity in hepatocellular carcinoma (HCC) patients who were treated with radiotherapy (RT). PATIENTS AND METHODS A total of 90 HCC patients who underwent esophagogastroduodenoscopy (EGD) before and after RT were enrolled. RT was delivered as 30-50 Gy (median 37.5 Gy) in 2-5 Gy (median 3.5 Gy) per fraction. All endoscopic findings were reviewed and GD toxicities related to RT were graded by the Common Toxicity Criteria for Adverse Events, version 3.0. The predictive factors for the ≥ grade 2 GD toxicity were investigated. RESULTS Endoscopic findings showed erosive gastritis in 14 patients (16 %), gastric ulcers in 8 patients (9 %), erosive duodenitis in 15 patients (17 %), and duodenal ulcers in 14 patients (16 %). Grade 2 toxicity developed in 19 patients (21 %) and grade 3 toxicity developed in 8 patients (9 %). V25 for stomach and V35 for duodenum (volume receiving a RT dose of more than x Gy) were the most predictive factors for ≥ grade 2 toxicity. The gastric toxicity rate at 6 months was 2.9 % for V25 ≤ 6.3 % and 57.1 % for V25 > 6.3 %. The duodenal toxicity rate at 6 months was 9.4 % for V35 ≤ 5.4 % and 45.9 % for V35 > 5.4 %. By multivariate analysis including the clinical factors, V25 for stomach and V35 for duodenum were the significant factors. CONCLUSION EGD revealed that GD toxicity is common following RT for HCC. V25 for the stomach and V35 for the duodenum were the significant factors to predict ≥ grade 2 GD toxicity.
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Affiliation(s)
- H Yoon
- Department of Health Sciences and Technology, School of Medicine & Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea
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Selvam R, Jurkevich A, Kang SW, Mikhailova MV, Cornett LE, Kuenzel WJ. Distribution of the Vasotocin Subtype Four Receptor (VT4R) in the Anterior Pituitary Gland of the Chicken, Gallus gallus, and its Possible Role in the Avian Stress Response. J Neuroendocrinol 2013; 25:56-66. [PMID: 22849330 DOI: 10.1111/j.1365-2826.2012.02370.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 05/29/2012] [Accepted: 07/27/2012] [Indexed: 11/29/2022]
Abstract
The neurohormone arginine vasotocin (AVT) in non mammalian vertebrates is homologous to arginine vasopressin (AVP) in mammals. Its actions are mediated via G protein-coupled receptors that belong to the vasotocin/mesotocin family. Because of the known regulatory effects of nonapeptide hormones on anterior pituitary functions, receptor subtypes in that family have been proposed to be located in anterior pituitary cells. Recently, an avian vasotocin receptor subtype designated VT4R has been cloned, which shares 69% sequence homology with a human vasopressin receptor, the V1aR. In the present study, a polyclonal antibody to the VT4R was developed and validated to confirm its specificity to the VT4R. The antibody was used to test the hypothesis that the VT4R is present in the avian anterior pituitary and is specifically associated with certain cell types, where its expression is modulated by acute stress. Western blotting of membrane protein extracts from pituitary tissue, the use of HeLa cells transfected with the VT4R and peptide competition assays all confirmed the specificity of the antibody to the VT4R. Dual-labelling immunofluorescence microscopy was utilised to identify pituitary cell types that contained immunoreactive VT4R. The receptor was found to be widely distributed throughout the cephalic lobe but not in the caudal lobe of the anterior pituitary. Immunoreactive VT4R was associated with corticotrophs. Approximately 89% of immunolabelled corticotrophs were shown to contain the VT4R. The immunoreactive VT4R was not found in gonadotrophs, somatotrophs or lactotrophs. To determine a possible functional role of the VT4R and previously characterised VT2R, gene expression levels in the anterior pituitary were determined after acute immobilisation stress by quantitative reverse transcriptase-polymerase chain reaction. The results showed a significant increase in plasma corticosterone levels (three- to four-fold), a significant reduction of VT4R mRNA and an increase of VT2R mRNA (P < 0.05) in acutely immobilised chicks compared to controls. The data suggest a role of the VT4R in the avian stress response.
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Affiliation(s)
- R Selvam
- The Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, AR 72701, USA
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Ahn MJ, Murugan RN, Kim EJ, Lee JH, Cheong CJ, Kang SW, Park HJ, Shin SY, Kim HJ, Bang JK. Studies on the Effect of Number of Sugar Moiety in the Antifreeze Activity of Homodimeric AFGPs. B KOREAN CHEM SOC 2012. [DOI: 10.5012/bkcs.2012.33.7.2411] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kim DK, Nam BY, Li JJ, Park JT, Lee SH, Kim DH, Kim JY, Kang HY, Han SH, Yoo TH, Han DS, Kang SW. Translationally controlled tumour protein is associated with podocyte hypertrophy in a mouse model of type 1 diabetes. Diabetologia 2012; 55:1205-17. [PMID: 22311416 DOI: 10.1007/s00125-012-2467-7] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Accepted: 12/31/2011] [Indexed: 02/06/2023]
Abstract
AIMS/HYPOTHESIS Translationally controlled tumour protein (TCTP) is thought to be involved in cell growth by regulating mTOR complex 1 (mTORC1) signalling. As diabetes characteristically induces podocyte hypertrophy and mTORC1 has been implicated in this process, TCTP may have a role in the pathogenesis of diabetes-induced podocyte hypertrophy. METHODS We investigated the effects and molecular mechanisms of TCTP in diabetic mice and in high glucose-stimulated cultured podocytes. To characterise the role of TCTP, we conducted lentivirus-mediated gene silencing of TCTP both in vivo and in vitro. RESULTS Glomerular production of TCTP was significantly higher in streptozotocin induced-diabetic DBA/2J mice than in control animals. Double-immunofluorescence staining for TCTP and synaptopodin revealed that podocyte was the principal cell responsible for this increase. TCTP knockdown attenuated the activation of mTORC1 downstream effectors and the overproduction of cyclin-dependent kinase inhibitors (CKIs) in diabetic glomeruli, along with a reduction in proteinuria and a decrease in the sizes of podocytes as well as glomeruli. In addition, knockdown of TCTP in db/db mice prevented the development of diabetic nephropathy, as indicated by the amelioration of proteinuria, mesangial expansion, podocytopenia and glomerulosclerosis. In accordance with the in vivo data, TCTP inhibition abrogated high glucose-induced hypertrophy in cultured podocytes, which was accompanied by the downregulation of mTORC1 effectors and CKIs. CONCLUSIONS/INTERPRETATION These findings suggest that TCTP might play an important role in the process of podocyte hypertrophy under diabetic conditions via the regulation of mTORC1 activity and the induction of cell-cycle arrest.
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Affiliation(s)
- D K Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
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Yeom SH, Kim OG, Kang BH, Kim KJ, Yuan H, Kwon DH, Kim HR, Kang SW. Highly sensitive nano-porous lattice biosensor based on localized surface plasmon resonance and interference. Opt Express 2011; 19:22882-22891. [PMID: 22109166 DOI: 10.1364/oe.19.022882] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We propose a design for a highly sensitive biosensor based on nanostructured anodized aluminum oxide (AAO) substrates. A gold-deposited AAO substrate exhibits both optical interference and localized surface plasmon resonance (LSPR). In our sensor, application of these disparate optical properties overcomes problems of limited sensitivity, selectivity, and dynamic range seen in similar biosensors. We fabricated uniform periodic nanopore lattice AAO templates by two-step anodizing and assessed their suitability for application in biosensors by characterizing the change in optical response on addition of biomolecules to the AAO template. To determine the suitability of such structures for biosensing applications, we immobilized a layer of C-reactive protein (CRP) antibody on a gold coating atop an AAO template. We then applied a CRP antigen (Ag) atop the immobilized antibody (Ab) layer. The shift in reflectance is interpreted as being caused by the change in refractive index with membrane thickness. Our results confirm that our proposed AAO-based biosensor is highly selective toward detection of CRP antigen, and can measure a change in CRP antigen concentration of 1 fg/ml. This method can provide a simple, fast, and sensitive analysis for protein detection in real-time.
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Affiliation(s)
- Se-Hyuk Yeom
- School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Bukgu, 702-701 Daegu, South Korea
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Song S, Choi K, Ryu SW, Kang SW, Choi C. TRAIL promotes caspase-dependent pro-inflammatory responses via PKCδ activation by vascular smooth muscle cells. Cell Death Dis 2011; 2:e223. [PMID: 22048166 PMCID: PMC3223690 DOI: 10.1038/cddis.2011.103] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [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] [Indexed: 12/15/2022]
Abstract
Tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) is best known for its selective cytotoxicity against transformed tumor cells. Most non-transformed primary cells and several cancer cell lines are not only resistant to death receptor-induced apoptosis, but also subject to inflammatory responses in a nuclear factor-κB (NF-κB)-dependent manner. Although the involvement of TRAIL in a variety of vascular disorders has been proposed, the exact molecular mechanisms are unclear. Here, we aimed to delineate the role of TRAIL in inflammatory vascular response. We also sought possible molecular mechanisms to identify potential targets for the prevention and treatment of post-angioplastic restenosis and atherosclerosis. Treatment with TRAIL increased the expression of intercellular adhesion molecule-1 by primary human vascular smooth muscle cells via protein kinase C (PKC)δ and NF-κB activation. Following detailed analysis using various PKCδ mutants, we determined that PKCδ activation was mediated by caspase-dependent proteolysis. The protective role of PKCδ was further confirmed in post-traumatic vascular remodeling in vivo. We propose that the TRAIL/TRAIL receptor system has a critical role in the pathogenesis of inflammatory vascular disorders by transducing pro-inflammatory signals via caspase-mediated PKCδ cleavage and subsequent NF-κB activation.
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Affiliation(s)
- S Song
- Department of Bio and Brain Engineering, KAIST, Yuseong-gu, Daejeon, Korea
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Ahn MJ, Sohn HI, Nan YH, Murugan RN, Cheong CJ, Ryu EK, Kim EH, Kang SW, Kim EJ, Shin SY, Bang JK. Functional and Structural Characterization of Drosocin and its Derivatives Linked O-GalNAc at Thr 11Residue. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.9.3327] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Thayananuphat A, Youngren OM, Kang SW, Bakken T, Kosonsiriluk S, Chaiseha Y, El Halawani ME. Dopamine and mesotocin neurotransmission during the transition from incubation to brooding in the turkey. Horm Behav 2011; 60:327-35. [PMID: 21741977 DOI: 10.1016/j.yhbeh.2011.06.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2011] [Revised: 06/17/2011] [Accepted: 06/20/2011] [Indexed: 11/17/2022]
Abstract
We investigated the neuroendocrine changes involved in the transition from incubating eggs to brooding of the young in turkeys. Numbers of mesotocin (MT; the avian analog of mammalian oxytocin) immunoreactive (ir) neurons were higher in the nucleus paraventricularis magnocellularis (PVN) and nucleus supraopticus, pars ventralis (SOv) of late stage incubating hens compared to the layers. When incubating and laying hens were presented with poults, all incubating hens displayed brooding behavior. c-fos mRNA expression was found in several brain areas in brooding hens. The majority of c-fos mRNA expression by MT-ir neurons was observed in the PVN and SOv while the majority of c-fos mRNA expression in dopaminergic (DAergic) neurons was observed in the ventral part of the nucleus preopticus medialis (POM). Following intracerebroventricular injection of DA or oxytocin (OT) receptor antagonists, hens incubating eggs were introduced to poults. Over 80% of those injected with vehicle or the D1 DA receptor antagonist brooded poults, while over 80% of those receiving the D2 DA receptor antagonist or the OT receptor antagonist failed to brood the poults. The D2 DA/OT antagonist groups also displayed less c-fos mRNA in the dorsal part of POM and the medial part of the bed nucleus of the stria terminalis (BSTM) areas than did the D1 DA/vehicle groups. These data indicate that numerous brain areas are activated when incubating hens initially transition to poult brooding behavior. They also indicate that DAergic, through its D2 receptor, and MTergic systems may play a role in regulating brooding behaviors in birds.
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Affiliation(s)
- A Thayananuphat
- Department of Animal Science, University of Minnesota, St. Paul, MN 55108, USA
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Kim YH, Hur ST, Park CS, Park KW, Choi SW, Kang SW, Kim HR. A vertical-field-driven polymer-stabilized blue phase liquid crystal mode to obtain a higher transmittance and lower driving voltage. Opt Express 2011; 19:17427-17438. [PMID: 21935109 DOI: 10.1364/oe.19.017427] [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: 05/31/2023]
Abstract
We demonstrate a vertical-field-driven polymer-stabilized blue phase liquid crystal (PS-BPLC) mode for solving low transmittance and high driving voltage problems in conventional in-plane-switching (IPS) PS-BPLC modes. By controlling the ray directions of incident beams by means of two prism sheets attached to the top and bottom substrates, continuous grayscale properties can be achieved with a vertical field, where the transmittance of the proposed structure can be increased to become twice as high as that of a IPS PS-BPLC cell, and its driving voltage can also be lowered by about 20 V. With the vertical-field-driven PS-BPLC mode, the hysteresis problem of the IPS PS-BPLC mode can also be solved due to a reduction of the electric field required to achieve sufficient field-induced retardation.
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Affiliation(s)
- Yong-Hun Kim
- Department of Sensor and Display Engineering, Kyungpook National University, Daegu, Korea
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Yuan H, Kwon HC, Yeom SH, Kwon DH, Kang SW. MOSFET-BJT hybrid mode of the gated lateral bipolar junction transistor for C-reactive protein detection. Biosens Bioelectron 2011; 28:434-7. [PMID: 21835604 DOI: 10.1016/j.bios.2011.07.062] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [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: 04/29/2011] [Revised: 07/25/2011] [Accepted: 07/25/2011] [Indexed: 12/21/2022]
Abstract
In this study, we propose a novel biosensor based on a gated lateral bipolar junction transistor (BJT) for biomaterial detection. The gated lateral BJT can function as both a BJT and a metal-oxide-semiconductor field-effect transistor (MOSFET) with both the emitter and source, and the collector and drain, coupled. C-reactive protein (CRP), which is an important disease marker in clinical examinations, can be detected using the proposed device. In the MOSFET-BJT hybrid mode, the sensitivity, selectivity, and reproducibility of the gated lateral BJT for biosensors were evaluated in this study. According to the results, in the MOSFET-BJT hybrid mode, the gated lateral BJT shows good selectivity and reproducibility. Changes in the emitter (source) current of the device for CRP antigen detection were approximately 0.65, 0.72, and 0.80 μA/decade at base currents of -50, -30, and -10 μA, respectively. The proposed device has significant application in the detection of certain biomaterials that require a dilution process using a common biosensor, such as a MOSFET-based biosensor.
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Affiliation(s)
- Heng Yuan
- School of Electrical Engineering and Computer Science, Kyungpook National University, Daegu 702-701, Republic of Korea
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Lee DY, Song SB, Moon JY, Jeong KH, Park SJ, Kim HJ, Kang SW, Lee SH, Kim YH, Chung JH, Ihm CG, Lee TW. Association between interleukin-3 gene polymorphism and acute rejection after kidney transplantation. Transplant Proc 2011; 42:4501-4. [PMID: 21168724 DOI: 10.1016/j.transproceed.2010.09.153] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Accepted: 09/28/2010] [Indexed: 11/26/2022]
Abstract
BACKGROUND Acute rejection (AR) after kidney transplantation resulting from alloimmune responses has a negative effect on graft survival. AR is mainly caused by T-cell immune responses activated by cytokines, including interleukin (IL)-2, -4, and -7. Many reports have shown that single nucleotide polymorphisms (SNPs) of these cytokines can affect the occurrence of AR. IL-3, which is secreted by activated T cells, can mediate AR. Our study sought to investigate the association between SNPs of the IL3 gene and the occurrence of an AR episode (ARE). METHODS We analyzed 3 SNPs of IL3 (rs181781, rs2073506, and rs40401) among 330 renal recipients, 60 of whom had developed an ARE. SNPs of the IL3 gene, including 1 exonic SNP (rs40401) and 2 regulatory thought to be promoter SNPs (rs181781 and rs2073506). RESULTS The genotypes of 60 ARE subjects and the 270 patients without AR demonstrated a significant relationship between genotype frequencies and the SNPs. The occurrence of an ARE was associated with rs181781 (P = .041, dominant model), rs2073506 (P = .009, codominant 1 model; P = .003, dominant model), and rs40401 (P = .014, recessive model). Among haplotypes, AAT showed a significant association with ARE. (P = .0033). CONCLUSION Our results suggest that IL3 gene polymorphisms were associated with this event.
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Affiliation(s)
- D-Y Lee
- Department of Nephrology, Kyung Hee University Medical Center, Seoul, South Korea
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Kang SW, Park HJ, Ban JY, Chung JH, Chun GS, Cho JO. Effects of nicotine on apoptosis in human gingival fibroblasts. Arch Oral Biol 2011; 56:1091-7. [PMID: 21497792 DOI: 10.1016/j.archoralbio.2011.03.016] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [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: 09/14/2010] [Revised: 02/25/2011] [Accepted: 03/26/2011] [Indexed: 02/03/2023]
Abstract
AIM Cigarette smoke is a complex mixture of more than 4700 chemical compounds including free radicals and oxidants and it is a world widely known problem to health. Nicotine is the major compound of tobacco and known as the cause of gingivitis and periodontitis. It induces intracellular oxidative stress recognized as the important agent in the damage of biological molecules. The aim of this study is to clarify the cytotoxic pathway of nicotine in human gingival fibroblasts (HGFs). METHODS Human gingival fibroblasts stimulated by nicotine were used as an in vitro model. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was used to detect cell viability and reactive oxygen species (ROS) generation was assessed with 2,7-dichlorofluoroscein diacetate (DCF-DA). Morphological change was detected by terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate (dUTP) nick end labelling (TUNEL) assay, stained with 4,6-diamidino-2-phenylindole (DAPI). To delineate the roles of extracellular signal-regulated kinase (ERK), P38 and c-Jun N-terminal kinase (JNK), Western blot and caspase-3 (CASP3) activity assay were performed. RESULTS Exposure of the human gingival fibroblasts to nicotine reduced cell viability by time and dose dependent and increased the generation of ROS. It also showed morphological evidence of increased apoptosis, resulted in transient activation of JNK and ERK concomitant with activation of P38, and stimulated apoptosis as evidenced by CASP3 activation and Poly ADP ribose polymerase (PARP) cleavage. CONCLUSION These results suggest that nicotine induces apoptosis through the ROS generation and CASP3 dependent pathways in HGFs.
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Affiliation(s)
- S W Kang
- Department of Oral Pathology and Institute of Oral Biology, School of Dentistry, Kyung Hee University, Seoul 130-701, Republic of Korea
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