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Ryu U, Chien PN, Jang S, Trinh XT, Lee HS, Van Anh LT, Zhang XR, Giang NN, Van Long N, Nam SY, Heo CY, Choi KM. Zirconium-Based Metal-Organic Framework Capable of Binding Proinflammatory Mediators in Hydrogel Form Promotes Wound Healing Process through a Multiscale Adsorption Mechanism. Adv Healthc Mater 2024; 13:e2301679. [PMID: 37931928 DOI: 10.1002/adhm.202301679] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 10/30/2023] [Indexed: 11/08/2023]
Abstract
The regulation of proinflammatory mediators has been explored to promote natural healing without abnormal inflammation or autoimmune response induced by their overproduction. However, most efforts to control these mediators have relied on pharmacological substances that are directly engaged in biological cycles. It is believed that functional porous materials removing target mediators provide a new way to promote the healing process using their adsorption mechanisms. In this study, the Zr-based metal-organic frameworks (MOF)-808 (Zr6 O4 (OH)4 (BTC)2 (HCOO)6 ) crystals are found to be effective at removing proinflammatory mediators, such as nitric oxide (NO), cytokines, and reactive oxygen species (ROS) in vitro and in vivo, because of their porous structure and surface affinity. The MOF-808 crystals are applied to an in vivo skin wound model as a hydrogel dispersion. Hydrogel containing 0.2 wt% MOF-808 crystals shows significant improvement in terms of wound healing efficacy and quality over the corresponding control. It is also proven that the mode of action is to remove the proinflammatory mediators in vivo. Moreover, the application of MOF-808-containing hydrogels promotes cell activation, proliferation and inhibits chronic inflammation, leading to increased wound healing quality. These findings suggest that Zr-based MOFs may be a promising drug-free solution for skin problems related to proinflammatory mediators.
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Affiliation(s)
- UnJin Ryu
- Industry Collaboration Center, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Pham Ngoc Chien
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Suin Jang
- Department of Chemical and Biological Engineering & Institute of Advanced Materials & Systems, Sookmyung Women's University, Seoul, 04310, Republic of Korea
| | - Xuan-Tung Trinh
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Hyeon Shin Lee
- R&D Center, LabInCube Co. Ltd., Cheongju, 28116, Republic of Korea
| | - Le Thi Van Anh
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Xin Rui Zhang
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
- Department of Plastic and Reconstructive Surgery, College of Medicine, Seoul National University, Seoul, 03080, Republic of Korea
| | - Nguyen Ngan Giang
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Nguyen Van Long
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Sun-Young Nam
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
| | - Chan Yeong Heo
- Department of Plastic and Reconstructive Surgery, Seoul National University Bundang Hospital, Seongnam, 13620, Republic of Korea
- Department of Plastic and Reconstructive Surgery, College of Medicine, Seoul National University, Seoul, 03080, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering & Institute of Advanced Materials & Systems, Sookmyung Women's University, Seoul, 04310, Republic of Korea
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Zhang XR, Ryu U, Najmiddinov B, Trinh TTT, Choi KM, Nam SY, Heo CY. Effect of Silicone Patch Containing Metal-organic Framework on Hypertrophic Scar Suppression. In Vivo 2024; 38:235-245. [PMID: 38148076 PMCID: PMC10756491 DOI: 10.21873/invivo.13430] [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: 08/11/2023] [Revised: 11/01/2023] [Accepted: 11/02/2023] [Indexed: 12/28/2023]
Abstract
BACKGROUND/AIM Hypertrophic scars (HS) are an abnormal cutaneous condition of wound healing characterized by excessive fibrosis and disrupted collagen deposition. This study assessed the potential of a silicone patch embedded with chemically stable zirconium-based metal-organic frameworks (MOF)-808 structures to mitigate HS formation using a rabbit ear model. MATERIALS AND METHODS A silicone patch was strategically engineered by incorporating Zr-MOF-808, a composite structure comprising metal ions and organic ligands. Structural integrity of the Zr-MOF-808 silicone patch was validated using scanning electron microscopy and X-ray diffraction analysis. The animals were divided into three groups: a control, no treatment group (Group 1), a silicone patch treatment group (Group 2), and a group treated with a 0.2% loaded Zr-MOF-808 silicone patch (Group 3). HS suppression effects were quantified using scar elevation index (SEI), dorsal skin thickness measurements, and myofibroblast protein expression. RESULTS Histopathological examination of post-treatment HS samples revealed substantial reductions in SEI (34.6%) and epidermal thickness (49.5%) in Group 3. Scar hyperplasia was significantly diminished by 53.5% (p<0.05), while collagen density declined by 15.7% in Group 3 compared to Group 1. Western blot analysis of protein markers, including TGF-β1, collagen-1, and α-SMA, exhibited diminished levels by 8.8%, 12%, and 21.3%, respectively, in Group 3, and substantially higher levels by 21.9%, 27%, and 39.9%, respectively, in Group 2. On the 35th day post-wound generation, Zr-MOF-808-treated models exhibited smoother, less conspicuous, and flatter scars. CONCLUSION Zr-MOF-808-loaded silicone patch reduced HS formation in rabbit ear models by inducing the proliferation and remodeling of the wound healing process.
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Affiliation(s)
- Xin Rui Zhang
- Department of Plastic and Reconstructive Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Unjin Ryu
- Department of Chemical and Biological Engineering, Sookmyung Women's University, Seoul, Republic of Korea
| | - Bakhtiyor Najmiddinov
- Department of Plastic and Reconstructive Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Thuy-Tien Thi Trinh
- Korean Institute of Nonclinical Study, H&Bio. Co. Ltd., Seongnam, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women's University, Seoul, Republic of Korea;
- R&D Center, LabInCube Co. Ltd., Cheongju, Republic of Korea
| | - Sun-Young Nam
- Department of Plastic and Reconstructive Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea;
| | - Chan Yeong Heo
- Department of Plastic and Reconstructive Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea;
- Korean Institute of Nonclinical Study, H&Bio. Co. Ltd., Seongnam, Republic of Korea
- Department of Medical Device Development, College of Medicine, Seoul National University, Seoul, Republic of Korea
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Ko S, Ryu U, Park H, Fracaroli AM, Moon W, Choi KM. Effect of Spatial Heterogeneity on the Unusual Uptake Behavior of Multivariate-Metal-Organic Frameworks. J Am Chem Soc 2023; 145:3101-3107. [PMID: 36710507 DOI: 10.1021/jacs.2c12207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The uniqueness of multivariate metal-organic frameworks (MTV-MOFs) has been widely explored to discover their unknown opportunities. While mesoscopic apportionments have been studied, macroscopic heterogeneity and its spatial effects remain unexplored in MTV-MOFs. In this study, we investigated the effect of macroscopic heterogeneity on MTV-MOFs on their uptake behaviors by comparing three types of MTV-MOFs having the functional groups in inner, outer, or entire parts of crystals. Their adsorption behavior for carbon dioxide (CO2) and water (H2O) brought out that functional groups located in the outer part of the crystals dominantly influence the sorption behavior of MTV-MOFs. These results are also visualized by observing iodine adsorption in the three types of MTV-MOFs using scanning transmission electron microscopy-electron energy loss spectroscopy. We believe that this finding provides new ways to decipher and design MTV-MOFs for their unusual properties.
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Affiliation(s)
- Soyeon Ko
- Department of Chemical and Biological Engineering, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - UnJin Ryu
- Industry Collaboration Center, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Hyunjin Park
- National Institute for Nanomaterials Technology, Pohang University of Science & Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Alejandro M Fracaroli
- Instituto de Investigaciones en Físico-química de Córdoba, INFIQC-CONICET, Facultad de Ciencias Químicas, Departamento de Química Orgánica, Universidad Nacional de Córdoba, Ciudad Universitaria, Córdoba X5000HUA, Argentina
| | - WooYeon Moon
- Department of Chemical and Biological Engineering, Sookmyung Women's University, Seoul 04310, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women's University, Seoul 04310, Republic of Korea.,Muscle Physiome Research Center, Sookmyung Women's University, Seoul 04310, Republic of Korea
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Kim YJ, Ko SY, Kim S, Choi KM, Ryu WH. Cathodes Coating Layer with Li-Ion Diffusion Selectivity Employing Interactive Network of Metal-Organic Polyhedras for Li-Ion Batteries. Small 2023; 19:e2206561. [PMID: 36436836 DOI: 10.1002/smll.202206561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/05/2022] [Indexed: 06/16/2023]
Abstract
Surface modification of cathodes using Ni-rich coating layers prevents bulk and surface degradation for the stable operation of Li-ion batteries at high voltages. However, insulating and dense inorganic coating layers often impede charge transfer and ion diffusion kinetics. In this study, the fabrication of dual functional coating materials using metal-organic polyhedra (MOP) with 3D networks within microporous units of Li-ion batteries for surface stabilization and facile ion diffusion is proposed. Zr-based MOP is modified by introducing acyl groups as a chemical linkage (MOPAC), and MOPAC layers are homogenously coated by simple spray coating on the cathode. The coating allow the smooth transport of electrons and ions. MOPAC effectively suppress side reactions between the cathode and electrolyte and protect active materials against aggressive fluoride ions by forming a Li-ion selective passivation film. The MOPAC-coated Ni-rich layered cathode exhibited better cycle retention and enhanced kinetic properties than pristine and MOP-coated cathodes. Reduction of undesirable gas evolution on the cathode by MOPAC is also verified. Microporous MOPAC coating can simultaneously stabilize both the bulk and surface of the Ni-rich layered cathode and maintain good electrochemical reaction kinetics for high-performance Li-ion batteries.
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Affiliation(s)
- You Jin Kim
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
| | - So Yeon Ko
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
| | - Suji Kim
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
- Institute of Advanced Materials and Systems, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
| | - Won-Hee Ryu
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
- Institute of Advanced Materials and Systems, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul, 04310, Republic of Korea
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Seo M, Yoon J, Jung KW, Joo S, Lee J, Choi KM, Lee HJ, Yoon IJ, Noh W, Seo SY, Kim DY, Hwang SW, Park SH, Yang DH, Ye BD, Byeon JS, Yang SK, Myung SJ. Predicting Responsiveness to Biofeedback Therapy Using High-resolution Anorectal Manometry With Integrated Pressurized Volume. J Neurogastroenterol Motil 2022; 28:608-617. [PMID: 36250368 DOI: 10.5056/jnm21137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 11/25/2021] [Accepted: 03/13/2022] [Indexed: 11/20/2022] Open
Abstract
Background/Aims Biofeedback therapy is widely used to treat patients with chronic constipation, especially those with dyssynergic defecation. Yet, the utility of high-resolution manometry with novel parameters in the prediction of biofeedback response has not been reported. Thus, we constructed a model for predicting biofeedback therapy responders by applying the concept of integrated pressurized volume in patients undergoing high-resolution anorectal manometry. Methods Seventy-one female patients (age: 48-68 years) with dyssynergic defecation who underwent initial high-resolution anorectal manometry and subsequent biofeedback therapy were enrolled. The manometry profiles were used to calculate the 3-dimensional integrated pressurized volumes by multiplying the distance, time, and amplitude during simulated evacuation. Partial least squares regression was performed to generate a predictive model for responders to biofeedback therapy by using the integrated pressurized volume parameters. Results Fifty-five (77.5%) patients responded to biofeedback therapy. The responders and non-responders did not show significant differences in the conventional manometric parameters. The partial least squares regression model used a linear combination of eight integrated pressurized volume parameters and generated an area under the curve of 0.84 (95% confidence interval: 0.76-0.95, P < 0.01), with 85.5% sensitivity and 62.1% specificity. Conclusions Integrated pressurized volume parameters were better than conventional parameters in predicting the responsiveness to biofeedback therapy, and the combination of these parameters and partial least squares regression was particularly promising. Integrated pressurized volume parameters can more effectively explain the physiology of the anorectal canal compared with conventional parameters.
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Affiliation(s)
- Myeongsook Seo
- Department of Gastroenterology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Gangwon-do, Korea
| | - Jiyoung Yoon
- Department of Gastroenterology, Uijeongbu Eulji Medical Center, Eulji University School of Medicine, Uijeoungbu, Gyeonggi-do, Korea
| | - Kee Wook Jung
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Segyeong Joo
- Departments of Biomedical Engineering, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jungbok Lee
- Departments of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Kyung Min Choi
- Departments of Biomedical Engineering, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Hyo Jeong Lee
- Health Screening and Promotion Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - In Ja Yoon
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Woojoo Noh
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - So Young Seo
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Do Yeon Kim
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sung Wook Hwang
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sang Hyoung Park
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Dong-Hoon Yang
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Byong Duk Ye
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jeong-Sik Byeon
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Suk-Kyun Yang
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Seung-Jae Myung
- Departments of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Cho YW, Jee S, Suhito IR, Lee JH, Park CG, Choi KM, Kim TH. Single metal-organic framework-embedded nanopit arrays: A new way to control neural stem cell differentiation. Sci Adv 2022; 8:eabj7736. [PMID: 35442746 PMCID: PMC9020781 DOI: 10.1126/sciadv.abj7736] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 03/04/2022] [Indexed: 05/31/2023]
Abstract
Stable and continuous supply of essential biomolecules is critical to mimic in vivo microenvironments wherein spontaneous generation of various cell types occurs. Here, we report a new platform that enables highly efficient neuronal cell generation of neural stem cells using single metal-organic framework (MOF) nanoparticle-embedded nanopit arrays (SMENA). By optimizing the physical parameters of homogeneous periodic nanopatterns, each nanopit can confine single nMOFs (UiO-67) that are specifically designed for long-term storage and release of retinoic acid (RA). The SMENA platform successfully inhibited physical interaction with cells, which contributed to remarkable stability of the nMOF (RA⊂UiO-67) structure without inducing nanoparticle-mediated toxicity issues. Owing to the continuous and long-term supply of RA, the neural stem cells showed enhanced mRNA expressions of various neurogenesis-related activities. The developed SMENA platform can be applied to other stem cell sources and differentiation lineages and is therefore useful for various stem cell-based regenerative therapies.
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Affiliation(s)
- Yeon-Woo Cho
- School of Integrative Engineering, Chung-Ang University, 84 Heukseuk-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Seohyeon Jee
- Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Intan Rosalina Suhito
- School of Integrative Engineering, Chung-Ang University, 84 Heukseuk-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Jeong-Hyeon Lee
- School of Integrative Engineering, Chung-Ang University, 84 Heukseuk-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Chun Gwon Park
- Department of Biomedical Engineering, SKKU Institute for Convergence, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
- Department of Intelligent Precision Healthcare Convergence, SKKU Institute for Convergence, ungkyunkwan University (SKKU) , Suwon, Gyeonggi 16419, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea
- LabInCube Co. Ltd., A304-C2, 45, Yangcheong 4-gil, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do, Republic of Korea
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, 84 Heukseuk-ro, Dongjak-gu, Seoul 06974, Republic of Korea
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Ha L, Ryu U, Kang DC, Kim JK, Sun D, Kwon YE, Choi KM, Kim DP. Rapid Single-Step Growth of MOF Exoskeleton on Mammalian Cells for Enhanced Cytoprotection. ACS Biomater Sci Eng 2021; 7:3075-3081. [PMID: 34133131 DOI: 10.1021/acsbiomaterials.1c00539] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mammalian cells are promising agents for cell therapy, diagnostics, and drug delivery. For full utilization of the cells, development of an exoskeleton may be beneficial to protecting the cells against the environmental stresses and cytotoxins to which they are susceptible. We report here a rapid single-step method for growing metal-organic framework (MOF) exoskeletons on a mammalian cell surface under cytocompatible conditions. The MOF exoskeleton coating on the mammalian cells was developed via a one-pot biomimetic mineralization process. With the exoskeleton on, the individual cells were successfully protected against cell protease (i.e., Proteinase K), whereas smaller-sized nutrient transport across the exoskeleton was maintained. Moreover, vital cellular activities mediated by transmembrane GLUT transporter proteins were also unaffected by the MOF exoskeleton formation on the cell surfaces. Altogether, this ability to control the access of specific molecules to a single cell through the porous exoskeleton, along with the cytoprotection provided, should be valuable for biomedical applications of mammalian cells.
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Affiliation(s)
- Laura Ha
- Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - UnJin Ryu
- Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Dong-Chang Kang
- Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Jung-Kyun Kim
- Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Dengrong Sun
- Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Yong-Eun Kwon
- Center for Scientific Instrumentation, Korea Basic Science Institute (KBSI), 169-148 Gwahak-ro, Yuseong-gu, Daejeon 34133, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Dong-Pyo Kim
- Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
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Muhammad R, Jee S, Jung M, Park J, Kang SG, Choi KM, Oh H. Exploiting the Specific Isotope-Selective Adsorption of Metal-Organic Framework for Hydrogen Isotope Separation. J Am Chem Soc 2021; 143:8232-8236. [PMID: 33929190 DOI: 10.1021/jacs.1c01694] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Adsorptive separation using narrow-micropore adsorbents has demonstrated the potential to separate hydrogen isotopes. In this work, we employed an isotope-responsive separation using cobalt formate. A D2-responsive third sorption step was revealed, and consequently, a noticeable difference was observed in the uptakes of D2 and H2. This may have resulted from the additional space created for D2 due to its dense packing, as DFT calculations revealed that cobalt formate possesses 2.26 kJ/mol higher binding strength for D2 than for H2. The exploitation of this D2-responsive third sorption step renders a promising separation performance, with a D2/H2 selectivity of up to 44 at 25 K/1 bar. Lastly, cobalt formate was synthesized on a gram scale here, which makes it a prospect for commercialization.
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Affiliation(s)
- Raeesh Muhammad
- Department of Energy Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea
| | - Seohyeon Jee
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Minji Jung
- Department of Energy Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea
| | - Jaewoo Park
- Department of Energy Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea
| | - Sung Gu Kang
- School of Chemical Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Hyunchul Oh
- Department of Energy Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea.,Future Convergence Technology Research Institute, Jinju 52725, Republic of Korea
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Choi WH, Kim K, Lee H, Choi JW, Park DG, Kim GH, Choi KM, Kang JK. Metal-Organic Fragments with Adhesive Excipient and Their Utilization to Stabilize Multimetallic Electrocatalysts for High Activity and Robust Durability in Oxygen Evolution Reaction. Adv Sci (Weinh) 2021; 8:e2100044. [PMID: 34105280 PMCID: PMC8188218 DOI: 10.1002/advs.202100044] [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: 01/06/2021] [Revised: 02/07/2021] [Indexed: 06/12/2023]
Abstract
Multimetallic electrocatalysts have shown great potential to improve electrocatalytic performance, but their deteriorations in activity and durability are yet to be overcome. Here, metal-organic fragments with adhesive excipient to realize high activity with good durability in oxygen evolution reaction (OER) are developed. First, a leaf-like zeolitic-imidazolate framework (ZIF-L) is synthesized. Then, ionized species in hydrogen plasma attack preferentially the organic linkers of ZIF-L to derive cobalt-imidazole fragments (CIFs) as adhesive excipient, while they are designed to retain the coordinated cobalt nodes. Moreover, the vacant coordination sites at cobalt nodes and the unbound nitrogen at organic linkers induce high porosity and conductivity. The CIFs serve to stably impregnate trimetallic FeNiMo electrocatalysts (CIF:FeNiMo), and CIF:FeNiMo containing Fe contents of 22% and hexavalent Mo contents show to enable high activity with low overpotentials (203 mV at 10 mA cm-2 and 238 mV at 100 mA cm-2 ) in OER. The near O K-edge extended X-ray absorption fine structure proves further that high activity for OER originates from the partially filled eg orbitals. Additionally, CIF:FeNiMo exhibit good durability, as demonstrated by high activity retention during at least 45 days in OER.
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Affiliation(s)
- Won Ho Choi
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Keon‐Han Kim
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Heebin Lee
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Jae Won Choi
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Dong Gyu Park
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Gi Hwan Kim
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological EngineeringSookmyung Women's UniversityCheongpa‐ro 47‐gil 100, Yongsan‐guSeoul04310Republic of Korea
| | - Jeung Ku Kang
- Department of Materials Science and EngineeringKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
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10
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Abstract
Two major issues in cell-mediated drug delivery systems (c-DDS) are the availability of free cell surfaces for the binding of the cells to the target or to their microenvironment and internalization of the cytotoxic drug. In this study, the Janus structure, MOF nanoparticles, and tannic acid (TA) are utilized to address these issues. Janus carrier cells coated with metal-organic frameworks (MOFs) are produced by asymmetrically immobilizing the nanoparticles of a MOF based on zinc with cytotoxic enzymes that are internally encapsulated on the surface of carrier cells. By maintaining the biological and structural features of regular living cells, the MOF-coated Janus cells developed in the present study preserve the intrinsic binding capacity of the cells to their microenvironment. Interconnected MOFs loaded onto the other face of the Janus cells cannot penetrate the cell. Therefore, the carrier cells are protected from the cytotoxic drug contained in MOFs. These MOF-Janus carrier cells are demonstrated to successfully eliminate three-dimensional (3D) tumor spheroids when a chemotherapeutic protein of proteinase K is released from the MOF nanoparticles in an acid environment. The ease with which the MOF-Janus carrier cells are prepared (in 15 min), and the ability to carry a variety of enzymes and even multiple ones should make the developed system attractive as a general platform for drug delivery in various applications, including combination therapy.
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Affiliation(s)
- Laura Ha
- A Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women's University, 100 Cheongpa-ro 47-gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Dong-Pyo Kim
- A Center for Intelligent Microprocess of Pharmaceutical Synthesis Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
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11
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Jang S, Jee S, Kim R, Lee JH, Yoo HY, Park W, Shin J, Choi KM. Heterojunction of Pores in
Granola‐Type
Crystals of Two Different Metal–Organic Frameworks for Enhanced Formaldehyde Removal. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12185] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Suin Jang
- Department of Chemical and Biological Engineering Sookmyung Women's University, 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
| | - Seohyeon Jee
- Department of Chemical and Biological Engineering Sookmyung Women's University, 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
| | - Raekyung Kim
- Department of Chemical and Biological Engineering Sookmyung Women's University, 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
| | - Ju Ho Lee
- Korea Electronics Technology Institute 25 Saenari‐ro, Bundang‐gu, Seongnam‐si, Gyeonggi‐do 3509 Republic of Korea
| | - Ho Yeon Yoo
- Department of Applied Chemistry Andong National University, 375, Gyeongdong‐ro Andong Gyeongsangbuk‐do 36729 Republic of Korea
| | - Woosung Park
- Department of Mechanical Systems Engineering Sookmyung Women's University, 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
- Institute of Advanced Materials & Systems Sookmyung Women's University 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
| | - Jeeyoung Shin
- Department of Mechanical Systems Engineering Sookmyung Women's University, 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
- Institute of Advanced Materials & Systems Sookmyung Women's University 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering Sookmyung Women's University, 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
- Institute of Advanced Materials & Systems Sookmyung Women's University 100 Cheongpa‐ro 47 gil, Yongsan‐gu Seoul 04310 Republic of Korea
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12
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Ryu U, Jee S, Rao PC, Shin J, Ko C, Yoon M, Park KS, Choi KM. Recent advances in process engineering and upcoming applications of metal-organic frameworks. Coord Chem Rev 2021; 426:213544. [PMID: 32981945 PMCID: PMC7500364 DOI: 10.1016/j.ccr.2020.213544] [Citation(s) in RCA: 119] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 08/05/2020] [Accepted: 08/07/2020] [Indexed: 12/25/2022]
Abstract
Progress in metal-organic frameworks (MOFs) has advanced from fundamental chemistry to engineering processes and applications, resulting in new industrial opportunities. The unique features of MOFs, such as their permanent porosity, high surface area, and structural flexibility, continue to draw industrial interest outside the traditional MOF field, both to solve existing challenges and to create new businesses. In this context, diverse research has been directed toward commercializing MOFs, but such studies have been performed according to a variety of individual goals. Therefore, there have been limited opportunities to share the challenges, goals, and findings with most of the MOF field. In this review, we examine the issues and demands for MOF commercialization and investigate recent advances in MOF process engineering and applications. Specifically, we discuss the criteria for MOF commercialization from the views of stability, producibility, regulations, and production cost. This review covers progress in the mass production and formation of MOFs along with future applications that are not currently well known but have high potential for new areas of MOF commercialization.
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Key Words
- 2,4-DNT, 2,4-dinitrotoluene
- 4-NP, 4-nitrophenol
- ABS, acrylonitril-butadiene-styrene
- BET, Brunauer–Emmett–Teller
- CA, Cellulose-acetate
- CEES, 2-Chloroethyl ethyl sulfide
- CIE, Commission international ed’Eclairage
- CNF, Cellulose nanofiber
- CNG, compressed natural gas
- CVD, Chemical vapor deposition
- CWA, Chemical warfare agent
- CWC, Chemical weapons convention
- Commercialization
- DCP, Diethylchlorophosphonate
- DDM, n-dodecyl β-D-maltoside
- DEF, N,N-Diethyl formamide
- DFP, Diisopropyl fluorophosphate
- DFT, Density functional theory
- DIFP, Diisopropylfluorophosphate
- DLS, Dynamic light scattering
- DMA, Dimethylacetamide
- DMF, N,N-Dimethyl formamide
- DMMP, Dimethyl methylphosphonate
- DRIFTS, Diffuse reflectance infrared fourier transform spectroscopy
- Dispersion
- E. Coli, Escherichia coli
- ECS, Extrusion-crushing-sieving
- EDLCs, Electrochemical double-layer capacitors
- EPA, Environmental protection agency
- EXAFS, Extended X-ray absorption fine structure
- FT-IR, Fourier-transform infrared spectroscopy
- Fn, Fusobacterium nucleatum
- Future applications
- GC–MS, Gas chromatography–mass spectrometry
- GRGDS, Gly-Arg-Gly-Asp-Ser
- ILDs, Interlayer dielectrics
- ITRS, International technology roadmap for semiconductors
- LED, Light-emitting diode
- LIBs, Lithium-ion batteries
- LMOF, Luminescent metal–organic framework
- LOD, Limit of detection
- MB, methylene blue
- MBC, Minimum bactericidal concentration
- MIC, Minimum inhibitory concentration
- MIM, Metal-insulator–metal
- MMP, Methyl methylphosphonate
- MOF, metal–organic framework
- MOGs, Metal-organic gels
- MRA, mesoporous ρ-alumina
- MRSA, Methicillin-resistant staphylococcus aureus
- MVTR, Moisture vapor transport rate
- Mass production
- Metal–organic framework
- NMP, N-methyl-2-pyrrolidone
- NMR, Nuclear magnetic resonance
- PAN, Polyacrylonitrile
- PANI, Polyaniline
- PEG-CCM, polyethylene-glycol-modified mono-functional curcumin
- PEI, Polyetherimide
- PEMFCs, Proton-exchange membrane fuel cells
- PM, Particulate matter
- POM, Polyoxometalate
- PPC, Polypropylene/polycarbonate
- PS, Polystyrene
- PSM, Post-synthetic modification
- PVA, Polyvinyl alcohol
- PVB, Polyvinyl Butyral
- PVC, Polyvinylchloride
- PVF, Polyvinylformal
- PXRD, Powder x-ray diffraction
- Pg, Porphyromonas gingivalis
- RDX, 1,3,5-trinitro-1,3,5-triazinane
- ROS, Reactive oxygen species
- SALI, Solvent assisted ligand incorporation
- SBU, Secondary building unit
- SCXRD, Single-crystal X-ray diffraction
- SEM, Scanning electron microscope
- SIBs, Sodium-ion batteries
- SSEs, Solid-state electrolytes
- STY, space–time yield, grams of MOF per cubic meter of reaction mixture per day of synthesis
- Shaping
- TEA, Triethylamine
- TIPS-HoP, Thermally induced phase separation-hot pressing
- TNP, 2,4,6-trinitrophenol
- TNT, 2,4,6-trinitrotoluene
- UPS, Ultraviolet photoelectron spectroscopy
- VOC, Volatile organic compound
- WHO, World health organization
- WLED, White light emitting diode
- XPS, X-ray photoelectron spectroscopy
- ZIF, zeolitic imidazolate framework
- hXAS, Hard X-ray absorption spectroscopy
- sXAS, Soft X-ray absorption spectroscopy
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Affiliation(s)
- UnJin Ryu
- Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Seohyeon Jee
- Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Purna Chandra Rao
- Department of Chemistry & Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Jeeyoung Shin
- Department of Mechanical Systems Engineering, Sookmyung Women’s University, Seoul 04310, Republic of Korea,Institute of Advanced Materials & Systems, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Changhyun Ko
- Institute of Advanced Materials & Systems, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea,Department of Applied Physics, College of Engineering, Sookmyung Women’s University, Seoul 04310, Republic of Korea
| | - Minyoung Yoon
- Department of Chemistry & Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea,Corresponding authors at: Department of Chemistry & Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea (M. Yoon); Corporation R&D, Research Park, LG Chem, LG Science Park, 30, Magokjungang-10-RoGangseo-Gu, Seoul, Republic of Korea (K.S. Park); Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea, Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea (K.M. Choi)
| | - Kyo Sung Park
- Corporation R&D, Research Park, LG Chem, LG Science Park, 30, Magokjungang-10-Ro, Gangseo-Gu, Seoul, Republic of Korea,Corresponding authors at: Department of Chemistry & Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea (M. Yoon); Corporation R&D, Research Park, LG Chem, LG Science Park, 30, Magokjungang-10-RoGangseo-Gu, Seoul, Republic of Korea (K.S. Park); Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea, Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea (K.M. Choi)
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea,Institute of Advanced Materials & Systems, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea,Corresponding authors at: Department of Chemistry & Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea (M. Yoon); Corporation R&D, Research Park, LG Chem, LG Science Park, 30, Magokjungang-10-RoGangseo-Gu, Seoul, Republic of Korea (K.S. Park); Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea, Department of Chemical and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea (K.M. Choi)
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13
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Lee JHS, Cheng EOL, Choi KM, Ngu SF, Cheung RYK. 2020 Hong Kong College of Obstetricians and Gynaecologists guideline on investigations of premenopausal women with abnormal uterine bleeding. Hong Kong Med J 2020; 26:520-525. [PMID: 33350964 DOI: 10.12809/hkmj208897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Abnormal uterine bleeding in premenopausal women is a common gynaecological symptom and composes of abnormality in the frequency, duration, regularity, and flow volume of menstruation. It could constitute the presentation of various gynaecological malignancies. An appropriate history and physical examination are mandatory to ascertain the diagnosis. Depending on the clinical condition, a complete blood picture, thyroid function test, clotting profile, chlamydia test, cervical smear, and pregnancy test can be performed. Ultrasound should be performed in cases with a pelvic mass, unsatisfactory physical examination, persistent symptoms, or no response to medical treatment. In women aged ≥40 years, an out-patient endometrial biopsy with Pipelle should be performed. In women aged <40 years with risk factors for endometrial cancer, persistent symptoms, or no response to medical treatment, an endometrial biopsy should be performed to rule out endometrial cancer. Hysteroscopy or saline infusion sonohysterography is more sensitive than ultrasound for diagnosing endometrial pathology. Details of the above recommendations are presented.
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Affiliation(s)
- J H S Lee
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong
| | - E O L Cheng
- Department of Obstetrics and Gynaecology, United Christian Hospital, Hong Kong
| | - K M Choi
- Department of Obstetrics and Gynaecology, Pamela Youde Nethersole Eastern Hospital, Hong Kong
| | - S F Ngu
- Department of Obstetrics and Gynaecology, The University of Hong Kong, Hong Kong
| | - R Y K Cheung
- Department of Obstetrics and Gynaecology, The Chinese University of Hong Kong, Hong Kong.,Chairman, HKCOG Guideline Sub-committee
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14
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Choi WH, Moon BC, Park DG, Choi JW, Kim K, Shin J, Kim MG, Choi KM, Kang JK. Autogenous Production and Stabilization of Highly Loaded Sub-Nanometric Particles within Multishell Hollow Metal-Organic Frameworks and Their Utilization for High Performance in Li-O 2 Batteries. Adv Sci (Weinh) 2020; 7:2000283. [PMID: 32382491 PMCID: PMC7201254 DOI: 10.1002/advs.202000283] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/21/2020] [Accepted: 02/24/2020] [Indexed: 05/22/2023]
Abstract
Sub-nanometric particles (SNPs) of atomic cluster sizes have shown great promise in many fields such as full atom-to-atom utilization, but their precise production and stabilization at high mass loadings remain a great challenge. As a solution to overcome this challenge, a strategy allowing synthesis and preservation of SNPs at high mass loadings within multishell hollow metal-organic frameworks (MOFs) is demonstrated. First, alternating water-decomposable and water-stable MOFs are stacked in succession to build multilayer MOFs. Next, using controlled hydrogen bonding affinity, isolated water molecules are selectively sieved through the hydrophobic nanocages of water-stable MOFs and transferred one by one to water-decomposable MOFs. The transmission of water molecules via controlled hydrogen bonding affinity through the water-stable MOF layers is a key step to realize SNPs from various types of alternating water-decomposable and water-stable layers. This process transforms multilayer MOFs into SNP-embedded multishell hollow MOFs. Additionally, the multishell stabilizes SNPs by π-backbonding allowing high conductivity to be achieved via the hopping mechanism, and hollow interspaces minimize transport resistance. These features, as demonstrated using SNP-embedded multishell hollow MOFs with up to five shells, lead to high electrochemical performances including high volumetric capacities and low overpotentials in Li-O2 batteries.
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Affiliation(s)
- Won Ho Choi
- Department of Materials Science and Engineering and NanoCentury KAIST InstituteKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Byeong Cheul Moon
- Department of Materials Science and Engineering and NanoCentury KAIST InstituteKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Dong Gyu Park
- Department of Materials Science and Engineering and NanoCentury KAIST InstituteKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Jae Won Choi
- Department of Materials Science and Engineering and NanoCentury KAIST InstituteKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Keon‐Han Kim
- Department of Materials Science and Engineering and NanoCentury KAIST InstituteKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Jae‐Sun Shin
- Department of ChemistryKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
| | - Min Gyu Kim
- Pohang Accelerator Laboratory (PAL)Korea Pohang University of Science and Technology77 Cheongam‐ro, Namg‐guPohang37673Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological EngineeringSookmyung Women's UniversityCheongpa‐ro 47‐gil 100, Yongsan‐guSeoul04310Republic of Korea
| | - Jeung Ku Kang
- Department of Materials Science and Engineering and NanoCentury KAIST InstituteKorea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
- Graduate School of EnergyEnvironment Water and Sustainability (EEWS)Korea Advanced Institute of Science and Technology (KAIST)291 Daehak‐ro, Yuseong‐guDaejeon34141Republic of Korea
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15
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Kwak BO, Ma SH, Park SE, Shin SH, Choi KM, Lee TJ, Eun BW, Hong YJ, Kim DH. Comparison of the Immunogenicity and Safety of Three Enhanced Inactivated Poliovirus Vaccines from Different Manufacturers in Healthy Korean Infants: A Prospective Multicenter Study. Vaccines (Basel) 2020; 8:E200. [PMID: 32357552 PMCID: PMC7349543 DOI: 10.3390/vaccines8020200] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 04/23/2020] [Accepted: 04/24/2020] [Indexed: 11/16/2022] Open
Abstract
The enhanced inactivated poliovirus vaccine was first introduced in 2002, and several inactivated poliovirus vaccines are licensed in Korea. Reliable data by a prospective study on the immunogenicity and safety of the inactivated poliovirus vaccines in Korean infants are required. Normal healthy infants aged 6-12 weeks received three doses of the vaccine (IPVAX™, Imovax Polio™ or Poliorix™) in intervals of 2 months. Neutralizing antibody (NTAb) titers were measured before and 4-6 weeks after three-dose primary vaccination. Immunogenicity was evaluated by seroconversion rates and geometric mean titers obtained by analyzing NTAb titers. Local and systemic adverse events were recorded during 7 days after each vaccination. A total of 150 infants were included: 40 in IPVAX™, 52 in Imovax Polio™, and 58 in Poliorix™. The seroconversion rates for the group vaccinated with IPVAX™ were 100% in types 1, 2 and 3, while those of Imovax Polio™ were 98.1%, 96.2%, 96.2% and those of Poliorix™ were 98.3%, 100%, 100%, respectively. In all groups, injection site redness and irritability were the most common local and systemic adverse events. Neither serious adverse events nor adverse events above grade 2 were reported throughout the study. The currently used inactivated poliovirus vaccines was demonstrated to be safe and immunogenic in healthy Korean infants.
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Affiliation(s)
- Byung Ok Kwak
- Department of Pediatrics, Hallym University Kangnam Sacred Heart Hospital, Seoul 07441, Korea;
| | - Sang Hyuk Ma
- Department of Pediatrics, Changwon Fatima Hospital, Changwon 51394, Korea;
| | - Su Eun Park
- Department of Pediatrics, Pusan National University School of Medicine, Busan 50612, Korea;
| | - Seon Hee Shin
- Department of Pediatrics, Hallym University Dongtan Sacred Heart Hospital, Hwaseong 18450, Korea;
| | - Kyung Min Choi
- Department of Pediatrics, CHA University Gangnam Medical Center, CHA University School of Medicine, Seoul 06135, Korea;
| | - Taek-Jin Lee
- Department of Pediatrics, CHA University Bundang Medical Center, CHA University School of Medicine, Seongnam 13496, Korea;
| | - Byung Wook Eun
- Department of Pediatrics, Eulji University School of Medicine, Eulji University Hospital, Seoul 01830, Korea;
| | - Young Jin Hong
- Department of Pediatrics, Inha University School of Medicine, Incheon 22332, Korea;
| | - Dong Hyun Kim
- Department of Pediatrics, Inha University School of Medicine, Incheon 22332, Korea;
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16
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Wadhwa M, Kang HN, Jivapaisarnpong T, Andalucia LR, Blades CDRZ, Casas Levano M, Chang W, Chew JY, Chilufya MB, Chirachanakul P, Cho HG, Cho YO, Choi KM, Chong S, Chua HM, Farahani AV, Gencoglu M, Ghobrial MRW, Guha P, Gutierrez Lugo MT, Ha SB, Habahbeh S, Hamel H, Hong Y, Iarutkin A, Jang H, Jayachandran R, Jivapaisarnpong T, Kang HN, Kim DY, Kim GH, Kim Y, Kwon HS, Larsen J, Lee AH, Lee J, Medvedeva K, Munkombwe Z, Oh I, Park J, Park J, Putri DE, Rodgers J, Ryu S, Savkina M, Schreitmueller T, Semeniuk O, Seo M, Shin YI, Shin J, Srivastava S, Song H, Song S, Tavares Neto J, Wadhwa M, Yamaguchi T, Youn HJD, Yun M. WHO implementation workshop on guidelines on procedures and data requirements for changes to approved biotherapeutic products, Seoul, Republic of Korea, 25-26 June 2019. Biologicals 2020; 65:50-59. [PMID: 31959504 DOI: 10.1016/j.biologicals.2019.12.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 12/20/2019] [Indexed: 10/25/2022] Open
Abstract
The first global workshop on implementation of the WHO guidelines on procedures and data requirements for changes to approved biotherapeutic products adopted by the WHO Expert Committee in 2018 was held in June 2019. The workshop participants recognized that the principles based on sound science and the potential for risk, as described in the WHO Guidelines on post-approval changes, which constitute the global standard for product life-cycle management are providing clarity and helping national regulatory authorities in establishing guidance while improving time-lines for an efficient regulation of products. Consequently, the regulatory situation for post-approval changes and guideline implementation is changing but there is a disparity between different countries. While the guidelines are gradually being implemented in some countries and also being considered in other countries, the need for regional workshops and further training on post-approval changes was a common theme reiterated by many participants. Given the complexities relating to post-approval changes in different regions/countries, there was a clear understanding among all participants that an efficient approach for product life-cycle management at a national level is needed to ensure faster availability of high standard, safe and efficacious medicines to patients as per the World Health Assembly Resolution 67.21.
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Affiliation(s)
- Meenu Wadhwa
- National Institute for Biological Standards and Control, Medicines and Healthcare Products Regulatory Agency, Potters Bar, United Kingdom.
| | - Hye-Na Kang
- World Health Organization, Avenue Appia 20, CH-1211, Geneva, Switzerland.
| | - Teeranart Jivapaisarnpong
- National Biopharmaceutical Facility, King Mongkut's University of Technology Thonburi, Bangkhuntian, Bangkok, 10150, Thailand.
| | -
- International MSD International GmbH, Singapore
| | | | | | - Mary Casas Levano
- General Directorate of Medicines Supplies and Drugs (DIGEMID), San Miguel, Peru
| | | | | | | | | | | | | | - Kyung Min Choi
- Ministry of Food and Drug Safety (MFDS), Republic of Korea
| | | | | | | | - Mumun Gencoglu
- International Federation of Pharmaceutical Manufacturers Association, Switzerland
| | | | | | | | | | | | | | | | - Aleksei Iarutkin
- Federal Service for Surveillance in Healthcare (Roszdravnadzor), Russian Federation
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Desi Eka Putri
- National Agency of Drug and Food Control (NADFC), Indonesia
| | | | | | - Maria Savkina
- The FSBI "SCEEMP of the Ministry of Health of the Russian Federation, Russian Federation
| | | | | | | | | | | | | | - HyeonHo Song
- ILDONG Pharmaceutical Co., Ltd, Republic of Korea
| | | | | | - Meenu Wadhwa
- National Institute for Biological Standards and Control, United Kingdom
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17
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Lee EJ, Bae J, Choi KM, Jeong NC. Exploiting Microwave Chemistry for Activation of Metal-Organic Frameworks. ACS Appl Mater Interfaces 2019; 11:35155-35161. [PMID: 31483139 DOI: 10.1021/acsami.9b12201] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Microwave is thought of as a useful electromagnetic radiation tool because it is often used in real life as well as in a variety of chemical processes. Meanwhile, activation of metal-organic frameworks (MOFs), which must be essentially done to remove coordinating and pore-filling solvents before the use of MOFs for various applications, has been performed commonly with the methods of heat supply or solvent exchange. Here, we show a new methodological microwave activation (MA), realizing it with various MOFs such as HKUST-1, UiO-66, and MOF-74s. For instance, microwave irradiation to the MOF samples for 4-35 min leads to the complete activation of the MOFs without structural damage. As described below, we further demonstrate that the solvent-assisted MA, which is the MA process performed after the solvent exchange, can substantially reduce the time for the activation by 4 min.
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Affiliation(s)
- Eun Ji Lee
- Department of Emerging Materials Science , DGIST , Daegu 42988 , Korea
| | - Jinhee Bae
- Department of Emerging Materials Science , DGIST , Daegu 42988 , Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering , Sookmyung Women's University , Seoul 04310 , Korea
| | - Nak Cheon Jeong
- Department of Emerging Materials Science , DGIST , Daegu 42988 , Korea
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Kim R, Jee S, Ryu U, Lee HS, Kim SY, Choi KM. Correction to: Surface-enhanced infrared detection of benzene in air using a porous metal-organic-frameworks film. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0315-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Jeong GY, Singh AK, Kim MG, Gyak KW, Ryu U, Choi KM, Kim DP. Metal-organic framework patterns and membranes with heterogeneous pores for flow-assisted switchable separations. Nat Commun 2018; 9:3968. [PMID: 30262867 PMCID: PMC6160406 DOI: 10.1038/s41467-018-06438-0] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [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: 03/27/2018] [Accepted: 09/04/2018] [Indexed: 11/30/2022] Open
Abstract
Porous metal-organic-frameworks (MOFs) are attractive materials for gas storage, separations, and catalytic reactions. A challenge exists, however, on how to introduce larger pores juxtaposed with the inherent micropores in different forms of MOFs, which would enable new functions and applications. Here we report the formation of heterogeneous pores within MOF particles, patterns, and membranes, using a discriminate etching chemistry, called silver-catalyzed decarboxylation. The heterogeneous pores are formed, even in highly stable MOFs, without altering the original structure. A decarboxylated MOF membrane is shown to have pH-responsive switchable selectivity for the flow-assisted separation of similarly sized proteins. We envision that our method will allow the use of heterogeneous pores for massive transfer and separation of complex and large molecules, and that the capability for patterning and positioning heterogeneous MOF films on diverse substrates bodes well for various energy and electronic device applications. Tailoring MOFs to allow access of complex and large molecules is a challenging task due to their inherent microporous nature. Here the authors engineer meso- and macroporous MOF patterns and membranes via a mild decarboxylation applicable to different substrates, demonstrating their potential in macromolecule separations.
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Affiliation(s)
- Guan-Young Jeong
- Center of Intelligent Microprocess for Pharmaceutical Synthesis, Department of Chemical Engineering, POSTECH (Pohang University of Science and Technology), Pohang, 37673, Korea
| | - Ajay K Singh
- Center of Intelligent Microprocess for Pharmaceutical Synthesis, Department of Chemical Engineering, POSTECH (Pohang University of Science and Technology), Pohang, 37673, Korea
| | - Min-Gyu Kim
- Beamline Research Division, Pohang Accelerator Laboratory (PAL), POSTECH (Pohang University of Science and Technology), Pohang, 37673, Korea
| | - Ki-Won Gyak
- Center of Intelligent Microprocess for Pharmaceutical Synthesis, Department of Chemical Engineering, POSTECH (Pohang University of Science and Technology), Pohang, 37673, Korea
| | - UnJin Ryu
- Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul, 04310, Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering and Institute of Advanced Materials & Systems, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul, 04310, Korea.
| | - Dong-Pyo Kim
- Center of Intelligent Microprocess for Pharmaceutical Synthesis, Department of Chemical Engineering, POSTECH (Pohang University of Science and Technology), Pohang, 37673, Korea.
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Ryu U, Jee S, Park JS, Han IK, Lee JH, Park M, Choi KM. Correction to Nanocrystalline Titanium Metal-Organic Frameworks for Highly Efficient and Flexible Perovskite Solar Cells. ACS Nano 2018; 12:7416. [PMID: 29956915 DOI: 10.1021/acsnano.8b04831] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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Ryu U, Jee S, Park JS, Han IK, Lee JH, Park M, Choi KM. Nanocrystalline Titanium Metal-Organic Frameworks for Highly Efficient and Flexible Perovskite Solar Cells. ACS Nano 2018; 12:4968-4975. [PMID: 29727573 DOI: 10.1021/acsnano.8b02079] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Flexible perovskite solar cells (PSCs) have attracted considerable attention due to their excellent performance, low-cost, and great potential as an energy supplier for soft electronic devices. In particular, the design of charge transporting layers (CTLs) is crucial to the development of highly efficient and flexible PSCs. Herein, nanocrystalline Ti-based metal-organic framework (nTi-MOF) particles are synthesized to have ca. 6 nm in diameter. These are then well-dispersed in alcohol solvents in order to generate electron transporting layers (ETLs) in PSCs under ambient temperatures using a spin-coating process. The electronic structure of nTi-MOF ETL is found to be suitable for charge injection and transfer from the perovskite to the electrodes. The combination of a [6,6]-phenyl-C61-butyric acid (PCBM) into the nTi-MOF ETL provides for efficient electron transfer and also suppresses direct contact between the perovskite and the electrode. This results in impressive power conversion efficiencies (PCEs) of 18.94% and 17.43% for rigid and flexible devices, respectively. Moreover, outstanding mechanical stability is retained after 700 bending cycles at a bending radius ( r) of 10 mm.
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Affiliation(s)
- UnJin Ryu
- Department of Chemical and Biological Engineering , Sookmyung Women's University , Seoul 04310 , Korea
| | - Seohyeon Jee
- Department of Chemical and Biological Engineering , Sookmyung Women's University , Seoul 04310 , Korea
| | - Joon-Suh Park
- Nanophotonics Research Center , Korea Institute of Science and Technology (KIST) , Seoul 02792 , Korea
| | - Il Ki Han
- Nanophotonics Research Center , Korea Institute of Science and Technology (KIST) , Seoul 02792 , Korea
| | - Ju Ho Lee
- Reliability Research Center , Korea Electronics Technology Institute (KETI) , 25 Saenari-ro , Bundang-gu, Seongnam-si , Gyeonggi-do 463-816 , South Korea
| | - Minwoo Park
- Department of Chemical and Biological Engineering , Sookmyung Women's University , Seoul 04310 , Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering , Sookmyung Women's University , Seoul 04310 , Korea
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Kim NH, Choi J, Kim NH, Choi KM, Baik SH, Lee J, Kim SG. Dipeptidyl peptidase-4 inhibitor use and risk of diabetic retinopathy: A population-based study. Diabetes Metab 2018; 44:361-367. [PMID: 29752167 DOI: 10.1016/j.diabet.2018.03.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 03/09/2018] [Accepted: 03/11/2018] [Indexed: 10/17/2022]
Abstract
AIMS This study examined whether dipeptidyl peptidase (DPP)-4 inhibitor use is beneficial or harmful to diabetic retinopathy (DR) compared with other glucose-lowering agents in patients with type 2 diabetes (T2D). METHODS From a population-based cohort provided by the National Health Insurance Service in Korea, 67,743 adults with T2D were identified as having been treated with oral glucose-lowering agents between 2008 and 2013. Matching (1:1) was performed for two groups comparing ever-use (cases) and never-use (controls) of DPP-4 inhibitors (n=14,522 in each group). Cox regression analyses were used to assess risk of the following DR events: vitreous haemorrhage; vitrectomy or photocoagulation; intravitreal agent use; and blindness. RESULTS During a median follow-up of 28.4 (14.0-45.2) months, there were 305 (in controls) and 342 (in cases) composite DR events. DPP-4 inhibitor ever-use was not associated with overall risk of composite DR events [adjusted hazard ratio (HR): 1.08, 95% CI: 0.93-1.26] compared with never-use, nor was the risk of each DR outcome increased with DPP-4 inhibitor therapy either. However, DPP-4 inhibitor administration for<12 months was associated with a greater risk of composite DR events (adjusted HR: 1.31, 95% CI: 1.09-1.57) compared with other glucose-lowering agents over the same treatment period. CONCLUSION In comparison to other oral glucose-lowering agents, DPP-4 inhibitor treatment did not increase overall risk of DR. However, DPP-4 inhibitors may be associated with an increased risk of retinopathy events early in the treatment phase.
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Affiliation(s)
- N H Kim
- Division of endocrinology and metabolism, Department of internal medicine, Korea University Anam Hospital, Korea University College of Medicine, 126-1, Anam-dong 5-ga, Seongbuk-gu, 02841 Seoul, Korea
| | - J Choi
- Department of biostatistics, Korea University College of Medicine, Seoul, Korea
| | - N H Kim
- Division of endocrinology and metabolism, Department of internal medicine, Korea University Anam Hospital, Korea University College of Medicine, 126-1, Anam-dong 5-ga, Seongbuk-gu, 02841 Seoul, Korea
| | - K M Choi
- Division of endocrinology and metabolism, Department of internal medicine, Korea University Anam Hospital, Korea University College of Medicine, 126-1, Anam-dong 5-ga, Seongbuk-gu, 02841 Seoul, Korea
| | - S H Baik
- Division of endocrinology and metabolism, Department of internal medicine, Korea University Anam Hospital, Korea University College of Medicine, 126-1, Anam-dong 5-ga, Seongbuk-gu, 02841 Seoul, Korea
| | - J Lee
- Department of biostatistics, Korea University College of Medicine, Seoul, Korea
| | - S G Kim
- Division of endocrinology and metabolism, Department of internal medicine, Korea University Anam Hospital, Korea University College of Medicine, 126-1, Anam-dong 5-ga, Seongbuk-gu, 02841 Seoul, Korea.
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Choi KM, Kim MH, Cai H, Lee YJ, Hong Y, Ryu PY. Salicylic Acid Reduces OmpF Expression, Rendering Salmonella enterica Serovar Typhimurium More Resistant to Cephalosporin Antibiotics. Chonnam Med J 2018; 54:17-23. [PMID: 29399561 PMCID: PMC5794474 DOI: 10.4068/cmj.2018.54.1.17] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 01/18/2018] [Accepted: 01/19/2018] [Indexed: 11/06/2022] Open
Abstract
Salmonella enterica serovar Typhimurium is one of the most important bacterial pathogens causing diarrhea. The resistance of S. typhimurium to antimicrobial agents, which has recently been isolated from patients, is causing serious problems. We investigated the effects of salicylic acid (Sal) and acetyl salicylate (AcSal) on the susceptibility of S. typhimurium to cephalosporin antibiotics, which are known to increase resistance to cephalosporin and quinolone antibiotics. The MIC of cephalosporin antibiotics was higher than that of the media without Sal. The rate of accumulation of ethidium bromide (EtBr) in the bacteria by the outer membrane protein (Omp) was not different from that of the bacteria cultured in the medium containing Sal. However, Carbonyl cyanide-m-chlorophenylhydrazone (CCCP), an inhibitor of bacterial efflux pumps, significantly reduced the rate of accumulation of EtBr in bacteria cultured on Sal containing medium. In the medium containing CCCP, the MIC of the antimicrobial agent tended to decrease as compared with the control. In addition, the MIC of the bacteria treated with CCCP and Sal was higher than that of the antimicrobial agent against the CCCP treated experimental bacteria. These results suggest that Sal decreases the expression of OmpF in the Omp of S. typhimurium and reduces the permeability of cephalosporin antibiotics to bacteria, which may induce tolerance to cephalosporin antibiotics.
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Affiliation(s)
- Kyung Min Choi
- Department of Microbiology and Immunology, Chonnam National University Medical School, Gwangju, Korea
| | - Mi Hyun Kim
- Department of Microbiology and Immunology, Chonnam National University Medical School, Gwangju, Korea.,Molecular Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
| | - Hua Cai
- Department of Microbiology and Immunology, Chonnam National University Medical School, Gwangju, Korea
| | - Yong Jin Lee
- Molecular Imaging Research Center, Korea Institute of Radiological and Medical Sciences, Seoul, Korea
| | - Yeongjin Hong
- Department of Microbiology and Immunology, Chonnam National University Medical School, Gwangju, Korea
| | - Phil Youl Ryu
- Department of Microbiology and Immunology, Chonnam National University Medical School, Gwangju, Korea
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Kim B, Choi KM, Yim HS, Park HT, Yim JH, Lee MG. Adipogenic and Lipolytic Effects of Ascorbic Acid in Ovariectomized Rats. Yonsei Med J 2018; 59:85-91. [PMID: 29214781 PMCID: PMC5725369 DOI: 10.3349/ymj.2018.59.1.85] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 08/21/2017] [Accepted: 09/14/2017] [Indexed: 11/27/2022] Open
Abstract
PURPOSE Ascorbic acid has been reported to have an adipogenic effect on 3T3-L1 preadipocytes, while evidence also suggests that ascorbic acid reduces body weight in humans. In this study, we tested the effects of ascorbic acid on adipogenesis and the balance of lipid accumulation in ovariectomized rats, in addition to long-term culture of differentiated 3T3-L1 adipocytes. MATERIALS AND METHODS Murine 3T3-L1 fibroblasts and ovariectomized rats were treated with ascorbic acid at various time points. In vitro adipogenesis was analyzed by Oil Red O staining, and in vivo body fat was measured by a body composition analyzer using nuclear magnetic resonance. RESULTS When ascorbic acid was applied during an early time point in 3T3-L1 preadipocyte differentiation and after bilateral ovariectomy (OVX) in rats, adipogenesis and fat mass gain significantly increased, respectively. However, lipid accumulation in well-differentiated 3T3-L1 adipocytes showed a significant reduction when ascorbic acid was applied after differentiation (10 days after induction). Also, oral ascorbic acid administration 4 weeks after OVX in rats significantly reduced both body weight and subcutaneous fat layer. In comparison to the results of ascorbic acid, which is a well-known cofactor for an enzyme of collagen synthesis, and the antioxidant ramalin, a potent antioxidant but not a cofactor, showed only a lipolytic effect in well-differentiated 3T3-L1 adipocytes, not an adipogenic effect. CONCLUSION Taking these results into account, we concluded that ascorbic acid has both an adipogenic effect as a cofactor of an enzymatic process and a lipolytic effect as an antioxidant.
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Affiliation(s)
- Byoungjae Kim
- Department of Physiology, Korea University College of Medicine, Seoul, Korea
- Neuroscience Research Institute, Korea University, Seoul, Korea
| | - Kyung Min Choi
- Department of Physiology, Korea University College of Medicine, Seoul, Korea
| | - Hong Soon Yim
- Department of Physiology, Korea University College of Medicine, Seoul, Korea
| | - Hyun Tae Park
- Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, Korea University College of Medicine, Seoul, Korea
| | - Joung Han Yim
- Korea Polar Research Institute, Korea Institute of Ocean Science and Technology, Incheon, Korea
| | - Min Goo Lee
- Department of Physiology, Korea University College of Medicine, Seoul, Korea
- Neuroscience Research Institute, Korea University, Seoul, Korea.
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Kim S, Won CW, Kim BS, Kim S, Yoo J, Byun S, Jang HC, Cho BL, Son SJ, Lee JH, Park YS, Choi KM, Kim HJ, Lee SG. EuroQol Visual Analogue Scale (EQ-VAS) as a Predicting Tool for Frailty in Older Korean Adults: The Korean Frailty an Aging Cohort Study (KFACS). J Nutr Health Aging 2018; 22:1275-1280. [PMID: 30498837 DOI: 10.1007/s12603-018-1077-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVES This study was conducted to determine the cutoff value and efficacy of the EuroQol Visual Analogue Scale (EQ-VAS) for predicting frailty. DESIGN The EQ-VAS medians (Interquartile Range) were compared and analyzed against the FFI. PARTICIPANTS The subjects were 1471 older adults aged 70 to 84 years who had completed both EQ-VAS and Fried Frailty index (FFI) in the first baseline year (2016) of the Korean Frailty and Aging Cohort Study. RESULTS Of the 1471 subjects,600 were classified as robust, 716 as pre-frail, and 155 as frail. The median EQ-VAS scores were 80.00 (20.00) for robust, 75.00 (25.00) for pre-frail, and 60.00 (25.00) for frail subjects.The medians of all five components of the FFI, weight loss (70.00 vs. 80.00), grip strength (70.00 vs. 80.00), exhaustion (70.00 vs. 80.00), walking velocity (70.00 vs. 80.00), and physical activity (70.00 vs. 80.00), were lower in the abnormal groups. We tested the efficacy of EQ-VAS as a diagnostic tool to predict frailty, and the area under the curve of EQ-VAS was 0.71 withthe optimal cut-off value of 72. CONCLUSION EQ-VAS presented negative correlation with FFI, and the optimal cut off value for frailty was 72. These results suggest that EQ-VAS is a valuable tool for assessing frailty andmay be a good predictor of frailty in Korean elderly population.
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Affiliation(s)
- S Kim
- Chang Won Won, MD. Ph.D, Elderly Frailty Research Center, Department of Family Medicine, Kyung Hee University College of Medicine, Kyungheedaero 23, Dongdaemun-gu, Seoul, 02447 Republic of Korea.Tel: +82 2 958 8700; E-mail:
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Choi KM, Chan CK, Lau FL. Toxicology Training Unit in Emergency Department Reduces Admission to other Specialties and Hospital Length of Stay. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791602300601] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Objective To evaluate the outcome of intoxicated patients presented to Accident and Emergency Department (AED) in Hong Kong with Toxicology Training Unit accreditation and AED without toxicology team. Method A retrospective observational study with data collection from all intoxicated cases reported through Pre-hospital Activated Charcoal Programme, a protocol driven poisoning reporting system, from 1/7/2011 to 30/6/2013 (2 years). Data on basic demographic data (e.g. sex, age), receiving AED, admission rate to other specialty, length of stay in hospital exclude psychiatry ward admission and clinical outcome were collected and analysed. Five AEDs with Toxicology Training Unit (study group) and 7 AEDs without toxicology team (control group) were included. Results A total of 329 intoxicated cases were included in this study. The basic epidemiological data were similar in both groups. There was a significantly lower in hospital admissions in study group (16.9%) than in control group (69.3%; p<0.001) and significant shorter median of hospital stay of 22.1 hours (interquartile range [IQR] 12.8-43.5 hours) in study group compare to 42.7 hours (IQR 20.4-76.1 hours) in control group (p<0.001). Conclusion Our findings show that the establishment of the toxicology training unit can achieve significant reduction in admissions to other specialty and the length of stay in hospital in the management of patients with acute intoxication.
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Affiliation(s)
- UnJin Ryu
- Department of Chemical
and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Jounghyun Yoo
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang 37673, Republic of Korea
| | - Woosung Kwon
- Department of Chemical
and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical
and Biological Engineering, Sookmyung Women’s University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul 04310, Republic of Korea
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Moon BC, Park JH, Lee DK, Tsvetkov N, Ock I, Choi KM, Kang JK. Broadband Light Absorption and Efficient Charge Separation Using a Light Scattering Layer with Mixed Cavities for High-Performance Perovskite Photovoltaic Cells with Stability. Small 2017; 13:1700418. [PMID: 28594455 DOI: 10.1002/smll.201700418] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 04/22/2017] [Indexed: 06/07/2023]
Abstract
CH3 NH3 PbI3 is one of the promising light sensitizers for perovskite photovoltaic cells, but a thick layer is required to enhance light absorption in the long-wavelength regime ranging from PbI2 absorption edge (500 nm) to its optical band-gap edge (780 nm) in visible light. Meanwhile, the thick perovskite layer suppresses visible-light absorption in the short wavelengths below 500 nm and charge extraction capability of electron-hole pairs produced upon light absorption. Herein, we find that a new light scattering layer with the mixed cavities of sizes in 100 and 200 nm between transparent fluorine-doped tin oxide and mesoporous titanium dioxide electron transport layer enables full absorption of short-wavelength photons (λ < 500 nm) to the perovskite along with enhanced absorption of long-wavelength photons (500 nm < λ < 780 nm). Moreover, the light-driven electric field is proven to allow efficient charge extraction upon light absorption, thereby leading to the increased photocurrent density as well as the fill factor prompted by the slow recombination rate. Additionally, the photocurrent density of the cell with a light scattering layer of mixed cavities is stabilized due to suppressed charge accumulation. Consequently, this work provides a new route to realize broadband light harvesting of visible light for high-performance perovskite photovoltaic cells.
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Affiliation(s)
- Byeong Cheul Moon
- Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Jung Hyo Park
- Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Dong Ki Lee
- Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Nikolai Tsvetkov
- Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Ilwoo Ock
- Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul, 04310, Republic of Korea
| | - Jeung Ku Kang
- Graduate School of Energy, Environment, Water, and Sustainability (EEWS), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
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Ryu UJ, Kim SJ, Lim HK, Kim H, Choi KM, Kang JK. Synergistic interaction of Re complex and amine functionalized multiple ligands in metal-organic frameworks for conversion of carbon dioxide. Sci Rep 2017; 7:612. [PMID: 28377611 PMCID: PMC5428566 DOI: 10.1038/s41598-017-00574-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [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: 12/16/2016] [Accepted: 03/01/2017] [Indexed: 11/09/2022] Open
Abstract
A metal-organic framework (MOF) is composed of secondary building units (SBUs) of metal ions and organic ligands to link each SBU. Moreover, the photosynthetic synthesis of a valuable CO chemical from carbon dioxide (CO2) represents an important class of appealing methods. Herein, we find that a molecular photocatalyst with high selectivity and activity can be designed via a fine balance in the proximity of Re complex (ReI(CO)3(BPYDC)(Cl), BPYDC = 2,2'-bipyridine-5,5'-dicarboxylate) and -NH2 functionalized multiple ligands composing a MOF photocatalyst, denoted as Re-MOF-NH2. These ligands in Re-MOF-NH2 has been confirmed by infrared, UV-visible, and 1H nuclear magnetic resonance spectra. Moreover, we show from extended X-ray absorption fine structure and in-situ infrared spectra that the bond corresponding to Re-CO upon introduction of -NH2 functional groups is divided into asymmetric bonds of 1.4 Å and 2.3 Å along with different CO2 vibrations, thus making the configuration of carbonyl groups in a Re metal complex become asymmetric in addition to aiding formation of CO2 intermediates within Re-MOF-NH2. Indeed, both of the uneven electron distribution in asymmetric carbonyl groups for Re-CO and the intermolecular stabilization of carbamate intermediates are proven to give the approximately 3-fold increase in photocatalytic activity for conversion of CO2 into CO.
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Affiliation(s)
- Un Jin Ryu
- Graduate School of Energy, Environmental, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.,Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul, 04310, Republic of Korea
| | - Sang Jun Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Hyung-Kyu Lim
- Graduate School of Energy, Environmental, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Hyungjun Kim
- Graduate School of Energy, Environmental, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
| | - Kyung Min Choi
- Department of Chemical and Biological Engineering, Sookmyung Women's University, 100 Cheongpa-ro 47 gil, Yongsan-gu, Seoul, 04310, Republic of Korea.
| | - Jeung Ku Kang
- Graduate School of Energy, Environmental, Water and Sustainability (EEWS), Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea. .,Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
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Choi KM, Kim D, Rungtaweevoranit B, Trickett CA, Barmanbek JTD, Alshammari AS, Yang P, Yaghi OM. Plasmon-Enhanced Photocatalytic CO2 Conversion within Metal–Organic Frameworks under Visible Light. J Am Chem Soc 2016; 139:356-362. [DOI: 10.1021/jacs.6b11027] [Citation(s) in RCA: 407] [Impact Index Per Article: 50.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kyung Min Choi
- Department
of Chemical and Biological Engineering, Sookmyung Women’s University, Seoul 04310, Korea
| | | | | | | | | | - Ahmad S. Alshammari
- King Abdulaziz City for Science and Technology, Post Office Box 6086, Riyadh 11442, Saudi Arabia
| | | | - Omar M. Yaghi
- King Abdulaziz City for Science and Technology, Post Office Box 6086, Riyadh 11442, Saudi Arabia
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Rungtaweevoranit B, Baek J, Araujo JR, Archanjo BS, Choi KM, Yaghi OM, Somorjai GA. Copper Nanocrystals Encapsulated in Zr-based Metal-Organic Frameworks for Highly Selective CO 2 Hydrogenation to Methanol. Nano Lett 2016; 16:7645-7649. [PMID: 27960445 DOI: 10.1021/acs.nanolett.6b03637] [Citation(s) in RCA: 207] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We show that the activity and selectivity of Cu catalyst can be promoted by a Zr-based metal-organic framework (MOF), Zr6O4(OH)4(BDC)6 (BDC = 1,4-benzenedicarboxylate), UiO-66, to have a strong interaction with Zr oxide [Zr6O4(OH)4(-CO2)12] secondary building units (SBUs) of the MOF for CO2 hydrogenation to methanol. These interesting features are achieved by a catalyst composed of 18 nm single Cu nanocrystal (NC) encapsulated within single crystal UiO-66 (Cu⊂UiO-66). The performance of this catalyst construct exceeds the benchmark Cu/ZnO/Al2O3 catalyst and gives a steady 8-fold enhanced yield and 100% selectivity for methanol. The X-ray photoelectron spectroscopy data obtained on the surface of the catalyst show that Zr 3d binding energy is shifted toward lower oxidation state in the presence of Cu NC, suggesting that there is a strong interaction between Cu NC and Zr oxide SBUs of the MOF to make a highly active Cu catalyst.
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Affiliation(s)
- Bunyarat Rungtaweevoranit
- Department of Chemistry, University of California-Berkeley, Kavli Energy NanoSciences Institute , Berkeley, California 94720, United States
| | - Jayeon Baek
- Department of Chemistry, University of California-Berkeley, Kavli Energy NanoSciences Institute , Berkeley, California 94720, United States
| | - Joyce R Araujo
- Department of Chemistry, University of California-Berkeley, Kavli Energy NanoSciences Institute , Berkeley, California 94720, United States
- Materials Metrology Division, National Institute of Metrology, Quality, and Technology , Duque de Caxias, Rio de Janeiro 25250-020, Brazil
| | - Braulio S Archanjo
- Materials Metrology Division, National Institute of Metrology, Quality, and Technology , Duque de Caxias, Rio de Janeiro 25250-020, Brazil
| | - Kyung Min Choi
- Department of Chemistry, University of California-Berkeley, Kavli Energy NanoSciences Institute , Berkeley, California 94720, United States
| | - Omar M Yaghi
- Department of Chemistry, University of California-Berkeley, Kavli Energy NanoSciences Institute , Berkeley, California 94720, United States
- King Abdulaziz City for Science and Technology , Riyadh 11442, Saudi Arabia
| | - Gabor A Somorjai
- Department of Chemistry, University of California-Berkeley, Kavli Energy NanoSciences Institute , Berkeley, California 94720, United States
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Kho MC, Lee YJ, Park JH, Kim HY, Yoon JJ, Ahn YM, Tan R, Park MC, Cha JD, Choi KM, Kang DG, Lee HS. Fermented Red Ginseng Potentiates Improvement of Metabolic Dysfunction in Metabolic Syndrome Rat Models. Nutrients 2016; 8:E369. [PMID: 27322312 PMCID: PMC4924210 DOI: 10.3390/nu8060369] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/27/2016] [Accepted: 06/02/2016] [Indexed: 01/08/2023] Open
Abstract
Metabolic syndrome including obesity, dyslipidemia and hypertension is a cluster of risk factors of cardiovascular disease. Fermentation of medicinal herbs improves their pharmacological efficacy. Red ginseng (RG), a widely used traditional herbal medicine, was reported with anti-inflammatory and anti-oxidant activity. Aim in the present study was to investigate that the effects of fermented red ginseng (FRG) on a high-fructose (HF) diet induced metabolic disorders, and those effects were compared to RG and losartan. Animals were divided into four groups: a control group fed a regular diet and tap water, and fructose groups that were fed a 60% high-fructose (HF) diet with/without RG 250 mg/kg/day or FRG 250 mg/kg/day for eight weeks, respectively. Treatment with FRG significantly suppressed the increments of body weight, liver weight, epididymal fat weight and adipocyte size. Moreover, FRG significantly prevented the development of metabolic disturbances such as hyperlipidemia and hypertension. Staining with Oil-red-o demonstrated a marked increase of hepatic accumulation of triglycerides, and this increase was prevented by FRG. FRG ameliorated endothelial dysfunction by downregulation of endothelin-1 (ET-1) and adhesion molecules in the aorta. In addition, FRG induced markedly upregulation of Insulin receptor substrate 1 (IRS-1) and glucose transporter type 4 (Glut4) in the muscle. These results indicate that FRG ameliorates obesity, dyslipidemia, hypertension and fatty liver in HF diet rats. More favorable pharmacological effects on HF diet induced metabolic disorders were observed with FRG, compared to an equal dose of RG. These results showed that the pharmacological activity of RG was enhanced by fermentation. Taken together, fermentated red ginseng might be a beneficial therapeutic approach for metabolic syndrome.
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Affiliation(s)
- Min Chul Kho
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Yun Jung Lee
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Ji Hun Park
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Hye Yoom Kim
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Jung Joo Yoon
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - You Mee Ahn
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Rui Tan
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Min Cheol Park
- Department of Oriental Medical Ophthalmology & Otolaryngology & Dermatology, College of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Jeong Dan Cha
- Department of Oral Microbiology and Institute of Oral Bioscience, Chonbuk National University, Jeonju, Jeonbuk 54896, Korea.
| | - Kyung Min Choi
- Department of Research Development, Institute of Jinan Red Ginseng, Jinan, Jeonbuk 55442, Korea.
| | - Dae Gill Kang
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
| | - Ho Sub Lee
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
- Hanbang Body-Fluid Research Center, Wonkwang University, 460 Iksandae-ro, Iksan, Jeonbuk 54538, Korea.
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Park JH, Choi KM, Lee DK, Moon BC, Shin SR, Song MK, Kang JK. Encapsulation of redox polysulphides via chemical interaction with nitrogen atoms in the organic linkers of metal-organic framework nanocrystals. Sci Rep 2016; 6:25555. [PMID: 27149405 PMCID: PMC4857742 DOI: 10.1038/srep25555] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [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: 01/08/2016] [Accepted: 04/18/2016] [Indexed: 12/24/2022] Open
Abstract
Lithium polysulphides generated during discharge in the cathode of a lithium-sulphur redox cell are important, but their dissolution into the electrolyte from the cathode during each redox cycle leads to a shortened cycle life. Herein, we use in situ spectroelectrochemical measurements to demonstrate that sp2 nitrogen atoms in the organic linkers of nanocrystalline metal-organic framework-867 (nMOF-867) are able to encapsulate lithium polysulphides inside the microcages of nMOF-867, thus helping to prevent their dissolution into the electrolyte during discharge/charge cycles. This encapsulation mechanism of lithiated/delithiated polysulphides was further confirmed by observations of shifted FTIR spectra for the C = N and C-N bonds, the XPS spectra for the Li-N bonds from nMOF-867, and a visualization method, demonstrating that nMOF-867 prevents lithium polysulphides from being dissolved in the electrolyte. Indeed, a cathode fabricated using nMOF-867 exhibited excellent capacity retention over a long cycle life of 500 discharge/charge cycles, with a capacity loss of approximately 0.027% per cycle from a discharge capacity of 788 mAh/g at a high current rate of 835 mA/g.
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Affiliation(s)
- Jung Hyo Park
- Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Kyung Min Choi
- Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.,Department of Chemical and Biological Engineering, Sookmyung Women's University Cheonpa-ro 47-gil 100, Yongsan-gu, Seoul 04310, Republic of Korea
| | - Dong Ki Lee
- Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Byeong Cheul Moon
- Graduate School of EEWS (Energy, Environment, Water, and Sustainability) Korea Advanced Institute of Science and Technology 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Sang Rim Shin
- Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Min-Kyu Song
- School of Mechanical and Materials Engineering, Washington State University Pullman, Washington 99164-2920, USA
| | - Jeung Ku Kang
- Department of Materials Science and Engineering, Advanced Institute of Science and Technology Korea 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.,Graduate School of EEWS (Energy, Environment, Water, and Sustainability) Korea Advanced Institute of Science and Technology 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Kho MC, Lee YJ, Park JH, Cha JD, Choi KM, Kang DG, Lee HS. Combination with Red ginseng and Polygoni Multiflori ameliorates highfructose diet induced metabolic syndrome. BMC Complement Altern Med 2016; 16:98. [PMID: 26961224 PMCID: PMC4784406 DOI: 10.1186/s12906-016-1063-7] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 02/19/2016] [Indexed: 11/13/2022]
Abstract
BACKGROUND Metabolic syndrome such as dyslipidemia, hypertension, obesity, impaired glucose tolerance and fatty liver, can be caused by modification of diet by means of overconsumption of high fructose diet. This study was designed to investigate whether combination with Red ginseng and Polygoni Multiflori Radix (RGPM), widely used traditional herbal medicine, ameliorates on highfructose (HF) diet-induced metabolic syndrome. METHODS SD rats were fed the 60% HF diet with/without rosiglitazone, and RGPM 100, 300 mg/kg/day, respectively. All groups received regular diet or HF diet, respectively, for 8 weeks. The last three groups treatment of rosiglitazone and RPGM orally for a period of 6 weeks. RESULTS Chronic treatment with RGPM significantly decreased body weight, fat weight and adipocyte size. RGPM significantly prevented the development of the metabolic disturbances such as hypertension, hyperlipidemia and impaired glucose tolerance. RGPM also led to increase in high density lipoprotein level in the HF group. RGPM suppressed high-fructose diet induced vascular inflammation marker expression such as adhesion molecules and ET-1 in aorta as well as increasing of C-reactive protein (CRP) levels in plasma. Similarly, RGPM attenuated hepatic lipid accumulation by inhibition of monocyte chemoattractant protein-1 (MCP-1) expression. CONCLUSION An administration of RGPM may be a beneficial therapy for the treatment of metabolic syndrome through the improvement of hypertension, obesity, hyperlipidemia, vascular inflammation and insulin resistance.
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Affiliation(s)
- Min Chul Kho
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea
- Hanbang Body-fluid Research Center, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea
| | - Yun Jung Lee
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea
- Hanbang Body-fluid Research Center, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea
| | - Ji Hun Park
- Hanbang Body-fluid Research Center, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea
| | - Jeong Dan Cha
- Department of Research Development, Institute of Jinan Red Ginseng, Jinan, Korea
| | - Kyung Min Choi
- Department of Research Development, Institute of Jinan Red Ginseng, Jinan, Korea
| | - Dae Gill Kang
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea.
- Hanbang Body-fluid Research Center, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea.
- Brain Korea (BK)21 plus team, Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk, 540-749, Republic of Korea.
| | - Ho Sub Lee
- College of Oriental Medicine and Professional Graduate School of Oriental Medicine, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea.
- Hanbang Body-fluid Research Center, Wonkwang University, Shinyong-dong, Iksan, Jeonbuk, 570-749, Korea.
- Brain Korea (BK)21 plus team, Professional Graduate School of Oriental Medicine, Wonkwang University, Iksan, Jeonbuk, 540-749, Republic of Korea.
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Scott D, Park MS, Kim TN, Ryu JY, Hong HC, Yoo HJ, Baik SH, Jones G, Choi KM. Associations of Low Muscle Mass and the Metabolic Syndrome in Caucasian and Asian Middle-aged and Older Adults. J Nutr Health Aging 2016; 20:248-55. [PMID: 26892573 DOI: 10.1007/s12603-015-0559-z] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE Age-related declines in skeletal muscle mass may confer significant metabolic consequences for older adults. Associations of low muscle mass and metabolic syndrome (MetS) in Caucasians, and comparisons with associations observed in Asian populations, have not been reported. We examined associations of low muscle mass and metabolic syndrome (MetS) in Asian and Caucasian middle-aged and older men and women using criteria for low muscle mass. DESIGN, SETTING AND PARTICIPANTS Two population-based studies of Australian (Tasmanian Older Adult Cohort Study; TASOAC; N=1005) and Korean (Korean Sarcopenic Obesity Study; KSOS; N=376) community-dwelling adults, mean age 62 and 58 years, respectively. MEASUREMENTS Appendicular lean mass (aLM) determined by dual-energy X-ray absorptiometry and normalised to height squared (aLM/Ht2), weight (aLM/Wt) or body mass index (aLM/BMI). Participants in the lowest sex-specific 20% for aLM measures were defined as having low muscle mass. MetS was defined according to National Cholesterol Education Program Adult Treatment Panel III criteria. RESULTS Although Australians demonstrated generally unfavourable anthropometric and metabolic characteristics compared to Koreans, prevalence of MetS was similar (29.5% in Australians and 31.4% in Koreans, respectively). Low aLM/Ht2 was associated with significantly reduced likelihood of MetS in both Australians (OR: 0.30, 95% CI 0.19 - 0.46) and Koreans (OR: 0.31, 95% CI 0.16 - 0.62). Conversely, low aLM/BMI was associated with increased odds for MetS in Australians (OR: 1.78, 95% CI 1.12 - 2.84), but not Koreans (OR: 1.33, 95% CI = 0.67 - 2.64). CONCLUSION Low aLM/BMI is associated with significantly increased likelihood of MetS in Australian adults, but not Koreans, suggesting potential differences in effects of low muscle mass relative to body mass on cardiometabolic health in Caucasian and Asian middle-aged and older adults. Low muscle mass relative to height is associated with reduced likelihood of MetS in both populations.
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Affiliation(s)
- D Scott
- Prof. Kyung Mook Choi, Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University Guro Hospital, 80 Guro-Dong, Guro-Gu, Seoul 152-050, Korea. E-mail: , Tel.: 822-2626-3043, Fax: 822-2626-1096
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Yang TD, Choi W, Yoon TH, Lee KJ, Lee JS, Joo JH, Lee MG, Yim HS, Choi KM, Kim B, Lee JJ, Kim H, Lee DY, Jung KY, Baek SK. In vivo photothermal treatment by the peritumoral injection of macrophages loaded with gold nanoshells. Biomed Opt Express 2016; 7:185-93. [PMID: 26819827 PMCID: PMC4722902 DOI: 10.1364/boe.7.000185] [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] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 12/11/2015] [Indexed: 05/28/2023]
Abstract
Photothermal treatment methods have been widely studied for their target specificity and potential for supplementing the limitations of conventional surgical treatments. In this study, we conducted in vivo photothermal treatments using macrophages containing nanoshells as live vectors. We injected macrophages at the peritumoral sites and observed that they had penetrated into the tumor approximately 48 hours after injection. Afterwards, we irradiated with a near-infrared laser for 2 minutes at 1 W/cm(2), causing cancer cell death. Our study identified the optimal conditions of the photothermal treatment and confirmed the feasibility of its use in in vivo treatments.
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Affiliation(s)
| | - Wonshik Choi
- Korea University, Department of Physics, Seoul, South Korea
| | - Tai Hyun Yoon
- Korea University, Department of Physics, Seoul, South Korea
| | - Kyoung Jin Lee
- Korea University, Department of Physics, Seoul, South Korea
| | - Jae-Seung Lee
- Korea University, Department of Materials Science and Engineering, Seoul, South Korea
| | - Jang Ho Joo
- Korea University, Department of Materials Science and Engineering, Seoul, South Korea
| | - Min-Goo Lee
- Korea University, Department of Physiology, Seoul, South Korea
| | - Hong Soon Yim
- Korea University, Department of Physiology, Seoul, South Korea
| | - Kyung Min Choi
- Korea University, Department of Physiology, Seoul, South Korea
| | - Byoungjae Kim
- Korea University, Department of Physiology, Seoul, South Korea
| | | | | | - Doh Young Lee
- Korea University, Department of Otolaryngology-Head and Neck Surgery, Seoul, South Korea
| | - Kwang-Yoon Jung
- Korea University, Department of Otolaryngology-Head and Neck Surgery, Seoul, South Korea
| | - Seung-Kuk Baek
- Korea University, Department of Otolaryngology-Head and Neck Surgery, Seoul, South Korea
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Ki MR, Lee JH, Yun SK, Choi KM, Hwang SY. Roles of the Peptide Transport Systems and Aminopeptidase PepA in Peptide Assimilation by Helicobacter pylori. J Microbiol Biotechnol 2015. [DOI: 10.4014/jmb.1505.05099] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Hyo Park J, Choi KM, Jeon HJ, Jung Choi Y, Kang JK. In-situ observation for growth of hierarchical metal-organic frameworks and their self-sequestering mechanism for gas storage. Sci Rep 2015; 5:12045. [PMID: 26155988 PMCID: PMC4496785 DOI: 10.1038/srep12045] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [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: 01/21/2015] [Accepted: 06/15/2015] [Indexed: 01/04/2023] Open
Abstract
Although structures with the single functional constructions and micropores were demonstrated to capture many different molecules such as carbon dioxide, methane, and hydrogen with high capacities at low temperatures, their feeble interactions still limit practical applications at room temperature. Herein, we report in-situ growth observation of hierarchical pores in pomegranate metal-organic frameworks (pmg-MOFs) and their self-sequestering storage mechanism, not observed for pristine MOFs. Direct observation of hierarchical pores inside the pmg-MOF was evident by in-situ growth X-ray measurements while self-sequestering storage mechanism was revealed by in-situ gas sorption X-ray analysis and molecular dynamics simulations. The results show that meso/macropores are created at the early stage of crystal growth and then enclosed by micropore crystalline shells, where hierarchical pores are networking under self-sequestering mechanism to give enhanced gas storage. This pmg-MOF gives higher CO2 (39%) and CH4 (14%) storage capacity than pristine MOF at room temperature, in addition to fast kinetics with robust capacity retention during gas sorption cycles, thus giving the clue to control dynamic behaviors of gas adsorption.
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Affiliation(s)
- Jung Hyo Park
- Department of Materials Science &Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Kyung Min Choi
- Department of Materials Science &Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Hyung Joon Jeon
- Department of Materials Science &Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Yoon Jung Choi
- Department of Materials Science &Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
| | - Jeung Ku Kang
- 1] Department of Materials Science &Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea [2] Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Republic of Korea
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Choi KM, Na K, Somorjai GA, Yaghi OM. Chemical Environment Control and Enhanced Catalytic Performance of Platinum Nanoparticles Embedded in Nanocrystalline Metal–Organic Frameworks. J Am Chem Soc 2015; 137:7810-6. [DOI: 10.1021/jacs.5b03540] [Citation(s) in RCA: 253] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kyung Min Choi
- Department
of Chemistry, University of California-Berkeley, Lawrence Berkeley National Laboratory, and Kavli Energy NanoSciences Institute, Berkeley, California 94720, United States
| | - Kyungsu Na
- Department
of Chemistry, University of California-Berkeley, Lawrence Berkeley National Laboratory, and Kavli Energy NanoSciences Institute, Berkeley, California 94720, United States
| | - Gabor A. Somorjai
- Department
of Chemistry, University of California-Berkeley, Lawrence Berkeley National Laboratory, and Kavli Energy NanoSciences Institute, Berkeley, California 94720, United States
| | - Omar M. Yaghi
- Department
of Chemistry, University of California-Berkeley, Lawrence Berkeley National Laboratory, and Kavli Energy NanoSciences Institute, Berkeley, California 94720, United States
- King Fahd University of Petroleum and Minerals, Dhahran 34464, Saudi Arabia
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Baek JH, Ahn SM, Choi KM, Jung MK, Shin MK, Koh JS. Analysis of comedone, sebum and porphyrin on the face and body for comedogenicity assay. Skin Res Technol 2015; 22:164-9. [PMID: 26094640 DOI: 10.1111/srt.12244] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/17/2015] [Indexed: 11/29/2022]
Abstract
BACKGROUND/PURPOSE Many ingredients used in cosmetics evoke a comedogenic response. Rabbit ear model (REM) is a useful method that can replace human in examining materials and products in early developmental stage. However, a number of studies pointed out its disadvantage that it overreacts to comedogenic materials. The purpose of this study was to find the most appropriate region for evaluating comedogenicity in human skin. METHODS Sixty-six female subjects (age 32.48 ± 10 years; range 20-52 years) with mild to moderate facial acne lesions were included in this study. The whole face, upper chest, and back of volunteers were photographed. Lesion (closed and open comedones) counting, instrumentation of sebum secretion level, and analysis of porphyrin number were performed. The entire study was performed under environmental conditions of specific relative temperature and humidity, controlled and maintained identically for each volunteer. RESULTS In case of closed comedone, forehead showed a significant correlation with frontal cheek, lateral cheek, chin, and upper back. Meanwhile, significant correlations were observed between frontal cheek and chin as well as lateral cheek and chest. As for open comedone, forehead showed a significant correlation with chin site. A significant correlation was also observed between front cheek and lateral cheek as well as between upper chest and back. Analyzing the correlation between the occurrence of comedones and sebum in each region, a significant correlation between closed comedone and sebum was observed in frontal and lateral cheek. Analyzing the correlation between the occurrence of comedones and porphyrine in each region, a significant correlation between open comedone and porphyrin was observed in chin. CONCLUSION When evaluating the comedogenicity of cosmetics ingredients or products, this study recommends using both of the methods of testing on back and directly testing on face according to the characteristics of the materials. In case of mild potent ingredients or products in particular, verification through usability test that the directly test on face will help securing reliability.
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Affiliation(s)
- J H Baek
- Dermapro Skin Research Center, DERMAPRO Ltd., Seoul, Korea
| | - S M Ahn
- Dermapro Skin Research Center, DERMAPRO Ltd., Seoul, Korea
| | - K M Choi
- Dermapro Skin Research Center, DERMAPRO Ltd., Seoul, Korea
| | - M K Jung
- Dermapro Skin Research Center, DERMAPRO Ltd., Seoul, Korea
| | - M K Shin
- Department of Dermatology, School of Medicine, Kyung Hee University, Seoul, Korea
| | - J S Koh
- Dermapro Skin Research Center, DERMAPRO Ltd., Seoul, Korea
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Baek JH, Park CW, Choi KM, Yang YS, Lee SY, Koh JS, Chung BY, Kim HO, Park GH. The Atopic Dermatitis Antecubital Severity score: validity, reliability, and sensitivity to change in patients with atopic dermatitis. Int J Dermatol 2014; 54:1382-9. [PMID: 25556325 DOI: 10.1111/ijd.12711] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 02/13/2014] [Accepted: 03/08/2014] [Indexed: 01/26/2023]
Abstract
BACKGROUND The Atopic Dermatitis Antecubital Severity (ADAS) score is a new objective scale for the assessment of the severity of atopic dermatitis (AD). It is calculated by multiplying the intensity of inflammatory signs by the size of an antecubital eczema lesion. AIM To test the validity, reliability, and sensitivity to changes of the ADAS score compared with those of the Eczema Area and Severity Index (EASI) score. METHODS Forty patients with AD were enrolled and treated with a moisturizer. At baseline, and in weeks 1 and 2, two independent evaluators measured the ADAS score, the EASI score, and the investigator's global assessment score rated on a six-point scale. RESULTS The ADAS score showed a higher validity than the EASI score. The superiority of the ADAS to the EASI was prominent in mild AD. Inter-evaluator reliability was excellent in both the ADAS score and the EASI. The sensitivity to changes was higher in the ADAS score than in the EASI score. CONCLUSIONS The ADAS score may be used as a simple scoring system with good validity, reliability, and sensitivity to changes, especially in patients with mild-to-moderate AD.
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Affiliation(s)
| | - Chun Wook Park
- Department of Dermatology, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | | | - Yoon Seok Yang
- Department of Dermatology, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | | | | | - Bo Young Chung
- Department of Dermatology, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Hye One Kim
- Department of Dermatology, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
| | - Gyeong-Hun Park
- Department of Dermatology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
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Na K, Choi KM, Yaghi OM, Somorjai GA. Metal nanocrystals embedded in single nanocrystals of MOFs give unusual selectivity as heterogeneous catalysts. Nano Lett 2014; 14:5979-83. [PMID: 25198135 DOI: 10.1021/nl503007h] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The growth of nanocrystalline metal-organic frameworks (nMOFs) around metal nanocrystals (NCs) is useful in controlling the chemistry and metric of metal NCs. In this Letter, we show rare examples of nMOFs grown in monocrystalline form around metal NCs. Specifically, Pt NCs were subjected to reactions yielding Zr(IV) nMOFs [Zr6O4(OH)4(fumarate)6, MOF-801; Zr6O4(OH)4(BDC)6 (BDC = 1,4-benzenedicarboxylate), UiO-66; Zr6O4(OH)4(BPDC)6 (BPDC = 4,4'-biphenyldicarboxylate), UiO-67] as a single crystal within which the Pt NCs are embedded. These constructs (Pt⊂nMOF)nanocrystal are found to be active in gas-phase hydrogenative conversion of methylcyclopentane (MCP) and give unusual product selectivity. The Pt⊂nUiO-66 shows selectivity to C6-cyclic hydrocarbons such as cyclohexane and benzene that takes place with 100 °C lower temperature than the standard reaction (Pt-on-SiO2). We observe a pore size effect in the nMOF series where the small pore of Pt⊂nMOF-801 does not produce the same products, while the larger pore Pt⊂nUiO-67 catalyst provides the same products but with different selectivity. The (Pt⊂nMOF)nanocrystal spent catalyst is found to maintain the original crystallinity, and be recyclable without any byproduct residues.
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Affiliation(s)
- Kyungsu Na
- † Department of Chemistry, University of California-Berkeley , Berkeley, California 94720, United States
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Abstract
The high porosity of metal-organic frameworks (MOFs) has been used to achieve exceptional gas adsorptive properties but as yet remains largely unexplored for electrochemical energy storage devices. This study shows that MOFs made as nanocrystals (nMOFs) can be doped with graphene and successfully incorporated into devices to function as supercapacitors. A series of 23 different nMOFs with multiple organic functionalities and metal ions, differing pore sizes and shapes, discrete and infinite metal oxide backbones, large and small nanocrystals, and a variety of structure types have been prepared and examined. Several members of this series give high capacitance; in particular, a zirconium MOF exhibits exceptionally high capacitance. It has the stack and areal capacitance of 0.64 and 5.09 mF cm(-2), about 6 times that of the supercapacitors made from the benchmark commercial activated carbon materials and a performance that is preserved over at least 10000 charge/discharge cycles.
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Affiliation(s)
- Kyung Min Choi
- Department of Chemistry, University of California-Berkeley , Materials Sciences Division at Lawrence Berkeley National Laboratory, and Kavli Energy NanoSciences Institute at Berkeley, Berkeley, California 94720, United States
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Yim HS, Choi KM, Kim B, Jung ID, Park YM, Kang YK, Lee MG. Effect of 1-methyl-D-tryptophan and adoptive transfer of dendritic cells on polymicrobial sepsis induced by cecal content injection. Microbiol Immunol 2014; 57:633-9. [PMID: 23841524 DOI: 10.1111/1348-0421.12081] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 06/24/2013] [Accepted: 06/27/2013] [Indexed: 11/28/2022]
Abstract
A mouse model of polymicrobial sepsis induced by cecal content injection (CCI) was developed with the aim of gaining a better understanding of the mechanism of sepsis. This model has a similar survival pattern to the conventional model with the added benefits of ability to vary the severity of sepsis and greater consistency. Administration of 1-methyl-D-tryptophan (1-MT) to inhibit indoleamine 2,3-dioxygenase (IDO) in mice with CCI-induced sepsis increased the survival rate and tended to up-regulate IL-10/IL-12 serum concentrations. The effectiveness of 1-MT was confirmed by increases in IL-10 over IL-12 in bone marrow-derived dendritic cells (BMDCs) treated with LPS and 1-MT and a superior survival rate 24 hr after injection of these double treated BMDCs in the CCI-induced sepsis model. Therefore, CCI is both a useful and reliable technique for investigating polymicrobial sepsis. The present findings using this newly developed model suggest that inhibition of IDO alleviates the severity of polymicrobial sepsis and modulates the immune response even in cases of severe systemic septic inflammation.
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Affiliation(s)
- Hong Soon Yim
- Department of Physiology, Korea University College of Medicine
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Kim B, Choi KM, Yim HS, Lee MG. Ascorbic acid enhances adipogenesis of 3T3-L1 murine preadipocyte through differential expression of collagens. Lipids Health Dis 2013; 12:182. [PMID: 24325571 PMCID: PMC3874642 DOI: 10.1186/1476-511x-12-182] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [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: 09/16/2013] [Accepted: 11/28/2013] [Indexed: 01/06/2023] Open
Abstract
Background Adipogenesis from preadipocytes into mature adipocyte is precisely coordinated by transcription factors such as CCAAT-enhancer-binding proteins (C/EBPs) and peroxisome proliferator-activated receptor γ (PPARγ), cytokines, and hormones, which is accompanied by extracellular matrix remodeling. Besides anti-oxidant activity, ascorbic acid (ASC) is participating in collagen biosynthesis and increase production and processing of collagens. Moreover, several studies demonstrated that ASC enhanced differentiation from preadipocytes into mature adipocytes. Methods The adipogenic effect of ascorbic acid was evaluated in chemical induced 3T3-L1 by Oil Red O staining. This effect was elucidated by immunoblotting which detected the expression level of collagens and transcription factors in adipogenesis. The immunocytochemical determination of type I collagen was performed in 3T3-L1 adipocyte to show the change of extracellular matrix during adipogenesis. Results In this study, Oil Red O staining in 3T3-L1 preadipocytes was increased dose-dependently by addition of ASC. These ASC-treated adipocytes increased collagen processing of α1(I) and α1(V) and expressed α1(VI) and α2(VI) collagens differentially. ASC also stimulated expression of C/EBPα and PPARγ, which is preceded by collagen enhancement. In addition, inhibition of ASC activity by ethyl-3,4-dihydroxybenzoate showed reduction of lipid accumulation by removal of large lipid droplets, not by inhibition of lipid production. This observation went with loss of α1(I) deposition on adipocyte surface, increase of α1(V) and α2(VI) collagens and decrease of C/EBPs. Conclusion Our findings imply that various actions of ASC on adipogenesis through differential collagen expression may provide diverse applications of ASC to adipose tissue technology.
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Affiliation(s)
| | | | | | - Min-Goo Lee
- Department of Physiology, Korea University College of Medicine, Seoul 136-705, Republic of Korea.
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Lee SH, Kim SM, Park HS, Choi KM, Cho GJ, Ko BJ, Kim JH. Serum 25-hydroxyvitamin D levels, obesity and the metabolic syndrome among Korean children. Nutr Metab Cardiovasc Dis 2013; 23:785-791. [PMID: 22762845 DOI: 10.1016/j.numecd.2012.04.013] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [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: 12/20/2011] [Revised: 04/02/2012] [Accepted: 04/25/2012] [Indexed: 11/24/2022]
Abstract
BACKGROUND AND AIM Evidence of the relationship between serum vitamin D levels and cardiovascular risk factors in children is limited. We investigated the associations between serum vitamin D levels (25-hydroxyvitamin D [25(OH)D]) and obesity and metabolic syndrome and its components in Korean children. METHODS AND RESULTS We recruited 1660, nine-year-old, Korean children (904 boys and 756 girls) who voluntarily participated in this study while being examined during school-based health examinations. We measured anthropometric variables (height and weight), metabolic parameters (blood pressure, fasting plasma glucose, triglyceride, and HDL cholesterol levels) and serum vitamin D levels. We analyzed the data using multivariate logistic regression models. Mean 25(OH)D levels were lower in children defined as obese or abdominally obese (P <0.001). When serum levels of 25(OH)D were divided into quartiles, BMI, waist circumference, and triglyceride levels were lower, and HDL cholesterol levels were higher, as vitamin D levels increased. Using children from the highest quartile of 25(OH)D levels as a referent, the adjusted ORs (95% CI) for obesity in those in the third, second, and lowest quartiles of 25(OH)D levels were 1.55 (1.01-2.40), 1.87 (1.22-2.85), and 2.59 (1.71-3.90), respectively (P for trend <0.001). For abdominal obesity the ORs (CI) were 2.08 (1.20-3.60), 2.32 (1.36-3.95), and 2.96 (1.75-5.00) (P for trend<0.001), and for metabolic syndrome they were 2.60 (1.08-6.30), 4.00 (1.73-9.26), and 4.25 (1.84-9.85), respectively (P for trend <0.05). CONCLUSIONS We found low vitamin D levels in Korean children to be associated with obesity and metabolic syndrome. Insufficient serum vitamin D levels in children may be a risk factor of obesity and metabolic syndrome.
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Affiliation(s)
- S H Lee
- Department of Family Medicine, College of Medicine, Korea University, Seoul, Republic of Korea
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Yoo HJ, Hwang SY, Cho GJ, Hong HC, Choi HY, Hwang TG, Kim SM, Blüher M, Youn BS, Baik SH, Choi KM. Association of glypican-4 with body fat distribution, insulin resistance, and nonalcoholic fatty liver disease. J Clin Endocrinol Metab 2013; 98:2897-901. [PMID: 23633195 DOI: 10.1210/jc.2012-4297] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [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] [Indexed: 02/13/2023]
Abstract
CONTEXT AND OBJECTIVE Glypican-4 was identified as a novel adipokine capable of enhancing insulin signaling and modulating adipocyte differentiation. We investigated associations between glypican-4 and body composition, insulin resistance, arterial stiffness, and nonalcoholic fatty liver disease (NAFLD) in nondiabetic Asian subjects. DESIGN AND PARTICIPANTS We analyzed baseline cross-sectional data from the Korean Sarcopenic Obesity Study, an ongoing prospective cohort study. NAFLD was diagnosed by unenhanced computed tomography using the liver attenuation index. We also examined the effects of a 3-month combined aerobic and resistance exercise program on glypican-4 levels and cardiometabolic risk factors. RESULTS Circulating glypican-4 levels were higher in men than in women (1.83 [1.19, 2.78] ng/mL vs 1.17 [0.66, 2.00] ng/mL, P < .001) and had a significant positive relationship with the waist-to-hip ratio (WHR) (r = 0.20, P = .014) and the ratio of visceral to sc fat area (r = 0.30, P < .001). Furthermore, glypican-4 levels in women were correlated with cardiometabolic risk factors, including insulin resistance and arterial stiffness, and were independently associated with NAFLD by multiple logistic regression analysis (P = .017, R² = 0.33). The 3-month combined exercise training program significantly improved several cardiometabolic parameters and reduced retinol binding protein-4 levels. Changes in glypican-4 levels after the exercise program were significantly different between subjects with an increased WHR compared with those with a decreased WHR (P = .034). CONCLUSION A gender-based difference in circulating glypican-4 levels was apparent as these were increased in women with NAFLD and related to body fat distribution, insulin resistance, and arterial stiffness.
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Affiliation(s)
- H J Yoo
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University, Seoul 152-703, Korea
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Yang TD, Choi W, Yoon TH, Lee KJ, Lee JS, Han SH, Lee MG, Yim HS, Choi KM, Park MW, Jung KY, Baek SK. Real-time phase-contrast imaging of photothermal treatment of head and neck squamous cell carcinoma: an in vitro study of macrophages as a vector for the delivery of gold nanoshells. J Biomed Opt 2012; 17:128003. [PMID: 23235837 DOI: 10.1117/1.jbo.17.12.128003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Photothermal treatment (PTT) using nanoparticles has gained attention as a promising alternative therapy for malignant tumors. One strategy for increasing the selectivity of PTT is the use of macrophages as a cellular vector for delivering nanoparticles. The aim of the present study is to examine the use of macrophages as a cellular vector for efficient PTT and determine the appropriate irradiation power and time of a near-infrared (NIR) laser using real-time phase-contrast imaging. Thermally induced injury and death of cancer cells were found to begin at 44°C to 45°C, which was achieved using the PTT effect with gold nanoshells (NS) and irradiation with a NIR laser at a power of 2 W for 5 min. The peritoneal macrophage efficiently functioned as a cellular vector for the NS, and the cancer cells surrounding the NS-loaded macrophages selectively lost their cellular viability after being irradiated with the NIR laser.
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Park HA, Choi JH, Choi KM, Lee DK, Kang JK. Highly porous gallium oxide with a high CO2 affinity for the photocatalytic conversion of carbon dioxide into methane. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30337j] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Park JH, Choi KM, Choi JH, Lee DK, Jeon HJ, Jeong HY, Kang JK. Fabrication of heterogeneous exposed core–shell catalyst array using the space specificity of an embodied micelle and their application to a high performance photocatalyst. Chem Commun (Camb) 2012; 48:11002-4. [DOI: 10.1039/c2cc36507c] [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: 11/21/2022]
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