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Cao Y, Luo B, Javaid A, Jung HJ, Ma T, Lim C, Emre A, Wang X, Kotov NA. Complex Materials with Stochastic Structural Patterns: Spiky Colloids with Enhanced Charge Storage Capacity. Adv Sci (Weinh) 2024; 11:e2305085. [PMID: 38036421 PMCID: PMC10811480 DOI: 10.1002/advs.202305085] [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] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 10/05/2023] [Indexed: 12/02/2023]
Abstract
Self-assembled materials with complex nanoscale and mesoscale architecture attract considerable attention in energy and sustainability technologies. Their high performance can be attributed to high surface area, quantum effects, and hierarchical organization. Delineation of these contributions is, however, difficult because complex materials display stochastic structural patterns combining both order and disorder, which is difficult to be consistently reproduced yet being important for materials' functionality. Their compositional variability make systematic studies even harder. Here, a model system of FeSe2 "hedgehog" particles (HPs) was selected to gain insight into the mechanisms of charge storage n complex nanostructured materials common for batteries and supercapacitors. Specifically, HPs represent self-assembled biomimetic nanomaterials with a medium level of complexity; they display an organizational pattern of spiky colloids with considerable disorder yet non-random; this patternt is consistently reproduced from particle to particle. . It was found that HPs can accommodate ≈70× greater charge density than spheroidal nano- and microparticles. Besides expanded surface area, the enhanced charge storage capacity was enabled by improved hole transport and reversible atomic conformations of FeSe2 layers in the blade-like spikes associated with the rotatory motion of the Se atoms around Fe center. The dispersibility of HPs also enables their easy integration into energy storage devices. HPs quadruple stored electrochemical energy and double the storage modulus of structural supercapacitors.
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Affiliation(s)
- Yuan Cao
- Department of Chemical EngineeringUniversity of MichiganAnn ArborMI48109USA
- Biointerface InstituteUniversity of MichiganAnn ArborMI48109USA
| | - Bingcheng Luo
- College of ScienceChina Agriculture UniversityBeijing100083China
| | - Atif Javaid
- Department of Chemical EngineeringUniversity of MichiganAnn ArborMI48109USA
- Biointerface InstituteUniversity of MichiganAnn ArborMI48109USA
- Department of Polymer EngineeringUniversity of Engineering and TechnologyG. T. RoadLahore54890Pakistan
- Department of Materials Science and EngineeringUniversity of MichiganAnn ArborMI48109USA
| | - Hong Ju Jung
- Department of Chemical EngineeringUniversity of MichiganAnn ArborMI48109USA
- Biointerface InstituteUniversity of MichiganAnn ArborMI48109USA
- Center for Complex Particle Systems (COMPASS)University of MichiganAnn ArborMI48109USA
| | - Tao Ma
- Department of Materials Science and EngineeringUniversity of MichiganAnn ArborMI48109USA
- Michigan Center for Materials CharacterizationUniversity of MichiganAnn ArborMI48109USA
| | - Chung‐Man Lim
- Biointerface InstituteUniversity of MichiganAnn ArborMI48109USA
- Department of Materials Science and EngineeringUniversity of MichiganAnn ArborMI48109USA
- Center for Complex Particle Systems (COMPASS)University of MichiganAnn ArborMI48109USA
| | - Ahmet Emre
- Department of Chemical EngineeringUniversity of MichiganAnn ArborMI48109USA
- Biointerface InstituteUniversity of MichiganAnn ArborMI48109USA
- Center for Complex Particle Systems (COMPASS)University of MichiganAnn ArborMI48109USA
| | - Xiaohui Wang
- School of Materials Science and EngineeringTsinghua UniversityBeijing100084China
| | - Nicholas A. Kotov
- Department of Chemical EngineeringUniversity of MichiganAnn ArborMI48109USA
- Biointerface InstituteUniversity of MichiganAnn ArborMI48109USA
- Department of Materials Science and EngineeringUniversity of MichiganAnn ArborMI48109USA
- Center for Complex Particle Systems (COMPASS)University of MichiganAnn ArborMI48109USA
- Department of Macromolecular Science and EngineeringUniversity of MichiganAnn ArborMI48109USA
- Department of AeronauticsFaculty of EngineeringImperial College LondonSouth Kensington CampusLondonSW7 2AZUK
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Ko SB, Sun Y, Park G, Choi HJ, Kim JG, Kim JB, Jung HJ, Lee GS, Hong S, Padmajan Sasikala S, Kim SO. Scalable Solution Phase Synthesis of 2D Siloxene via a Two-Step Interlayer Expansion Process. ACS Appl Mater Interfaces 2023. [PMID: 37377389 DOI: 10.1021/acsami.3c05289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
Two-dimensional (2D) siloxene is attracting considerable research interest recently principally owing to its inherent compatibility with silicon-based semiconductor technology. -The synthesis of siloxene has been mostly limited to multilayered structures using traditional topochemical reaction procedures. Herein, we report high-yield synthesis of single to few-layer siloxene nanosheets by developing a two-step interlayer expansion and subsequent liquid phase exfoliation procedure. Our protocol enables high-yield production of few-layer siloxene nanosheets with a lateral dimension of up to 4 μm and thickness ranging from 0.8 to 4.8 nm, corresponding to single to a few layers, well stabilized in water. The atomically flat nature of exfoliated siloxene can be exploited for the construction of 2D/2D heterostructure membranes via typical solution processing. We demonstrate highly ordered graphene/siloxene heterostructure films with synergistic mechanical and electrical properties, which deliver noticeably high device capacitance when assembled into a coin cell symmetric supercapacitor device structures. Additionally, we demonstrate that the mechanically flexible exfoliated siloxene-graphene heterostructure enables its direct use in flexible and wearable supercapacitor applications.
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Affiliation(s)
- Seung-Bo Ko
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Yan Sun
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Gun Park
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Hee Jae Choi
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Jin Goo Kim
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - June Beom Kim
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Hong Ju Jung
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Gang San Lee
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Seungbum Hong
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Suchithra Padmajan Sasikala
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, KAIST, Daejeon 34141, Republic of Korea
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Kim JT, Lee CW, Jung HJ, Choi HJ, Salman A, Padmajan Sasikala S, Kim SO. Application of 2D Materials for Adsorptive Removal of Air Pollutants. ACS Nano 2022; 16:17687-17707. [PMID: 36354742 DOI: 10.1021/acsnano.2c07937] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Air pollution is on the priority list of global safety issues, with the concern of fatal environmental and public health deterioration. 2D materials are potential adsorbent materials for environmental decontamination, owing to their high surface area, manageable interlayer binding, large surface-to-volume ratio, specific binding capability, and chemical, thermal, and mechanistic stability. Specifically, graphene oxide and reduced graphene oxide have been attracting attention, taking advantage of their low cost synthesis, excessive oxygen containing surface functionalities, and intrinsic aqueous dispersibility, making them desirable for the development of cost-effective, high performance air filters. Many different material designs have been proposed to expand their filtration capability, including the functionalization and integration with other metals and metal oxides, which act not only as binding agents to the target pollutants but also as antimicrobial agents. This review highlights the advantages and drawbacks of 2D materials for air filtration and summarizes the interrelationships among various strategies and the resultant filtration performance in terms of structural engineering, morphology control, and material compositions. Finally, potential future directions are suggested toward the idealized designs of 2D material based air filters.
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Affiliation(s)
- Jun Tae Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Chan Woo Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hong Ju Jung
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Hee Jae Choi
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Ali Salman
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Suchithra Padmajan Sasikala
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
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Kim JG, Yun T, Chae J, Yang GG, Lee GS, Kim IH, Jung HJ, Hwang HS, Kim JT, Choi SQ, Kim SO. Molecular-Level Lubrication Effect of 0D Nanodiamonds for Highly Bendable Graphene Liquid Crystalline Fibers. ACS Appl Mater Interfaces 2022; 14:13601-13610. [PMID: 35255687 DOI: 10.1021/acsami.1c24452] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Graphene fiber is emerging as a new class of carbon-based fiber with distinctive material properties particularly useful for electroconductive components for wearable devices. Presently, stretchable and bendable graphene fibers are principally employing soft dielectric additives, such as polymers, which can significantly deteriorate the genuine electrical properties of pristine graphene-based structures. We report molecular-level lubricating nanodiamonds as an effective physical property modifier to improve the mechanical flexibility of graphene fibers by relieving the tight interlayer stacking among graphene sheets. Nanoscale-sized NDs effectively increase the tensile strain and bending strain of graphene/nanodiamond composite fibers while maintaining the genuine electrical conductivity of pristine graphene-based fibers. The molecular-level lubricating mechanism is elucidated by friction force microscopy on the nanoscale as well as by shear stress measurement on the macroscopic scale. The resultant highly bendable graphene/nanodiamond composite fiber is successfully weaved into all graphene fiber-based textiles and wearable Joule heaters, proposing the potential for reliable wearable applications.
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Affiliation(s)
- Jin Goo Kim
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - Taeyeong Yun
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
- Nano Convergence Technology Research Center, Korea Electronics Technology Institute, Gyeonggi-do 13509, Republic of Korea
| | - Junsu Chae
- Department of Chemical and Biomolecular Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Geon Gug Yang
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - Gang San Lee
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - In Ho Kim
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - Hong Ju Jung
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - Ho Seong Hwang
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - Jun Tae Kim
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
| | - Siyoung Q Choi
- Department of Chemical and Biomolecular Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST Institute for Nanocentury, KAIST, Daejeon 34141, Republic of Korea
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Wee JH, Min C, Jung HJ, Park MW, Park B, Choi HG. Association between air pollution and chronic rhinosinusitis: a nested case-control study using meteorological data and national health screening cohort data. Rhinology 2021; 59:451-459. [PMID: 34472546 DOI: 10.4193/rhin21.141] [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: 11/08/2022]
Abstract
BACKGROUND Inconsistent results about the effect of air pollution on chronic rhinosinusitis (CRS) have been reported. This study aimed to evaluate the impact of meteorological conditions/air pollution on the prevalence of CRS in adult Koreans. METHODOLOGY The data from the Korean National Health Insurance Service-Health Screening Cohort from 2002 through 2015 were used. A CRS group (defined as ICD-10 codes J32, n=6159) was matched with a control group (n=24,636) in 1:4 ratios by age, sex, income, and region of residence. The meteorological conditions and air pollution data included the daily mean, highest, and lowest temperature (°C), daily temperature range (°C), relative humidity (%), ambient atmospheric pressure (hPa), sunshine duration (hr), and the rainfall (mm), SO2 (ppm), NO2 (ppm), O3 (ppm), CO (ppm), and PM10 (μg/m3) levels before the CRS diagnosis. Crude and adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for CRS were analyzed using logistic regression analyses. RESULTS When the NO2 level increased by 0.1 ppm, the odds for CRS increased 5.40 times, and when the CO level increased by 1 ppm and PM10 increased by 10 μg/m3, the odds for CRS decreased 0.75 times and 0.93 times, respectively. Other meteorological conditions, such as the mean/highest/lowest temperature, temperature range, rainfall and other air pollution, such as SO2 and O3, were not statistically significant. NO2 for 90 days before the index date increased the risk of CRS in all subgroups, except for the nasal polyp and older age subgroups. CONCLUSION CRS is related to high concentrations of NO2.
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Affiliation(s)
- J H Wee
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea
| | - C Min
- Hallym Data Science Laboratory, Hallym University College of Medicine, Anyang, Korea; Graduate School of Public Health, Seoul National University, Seoul, Korea
| | - H J Jung
- Department of Otorhinolaryngology-Head and Neck Surgery, Chungbuk National University Hospital, Chungbuk National University College of Medicine, Cheongju, Korea
| | - M W Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Kangdong Sacred Heart Hospital, Seoul, Korea
| | - B Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea
| | - H G Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea; Hallym Data Science Laboratory, Hallym University College of Medicine, Anyang, Korea
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Choi SY, Hong JY, Kim HJ, Lee GY, Cheong SH, Jung HJ, Bang CH, Lee DH, Jue MS, Kim HO, Park EJ, Ko JY, Son SW. Mask-induced dermatoses during the COVID-19 pandemic: a questionnaire-based study in 12 Korean hospitals. Clin Exp Dermatol 2021; 46:1504-1510. [PMID: 34081799 PMCID: PMC8239570 DOI: 10.1111/ced.14776] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 05/20/2021] [Accepted: 05/31/2021] [Indexed: 12/18/2022]
Abstract
BACKGROUND During the coronavirus disease 2019 (COVID-19) pandemic, various adverse skin reactions to long-term mask wearing have been reported. AIM To assess the clinical features of mask-induced dermatoses and to recommend prevention and treatment options. METHODS From April to August 2020, questionnaires including topics such as demographic information, pre-existing skin disorders, reported mask-related symptoms, daily mask-wearing duration and frequency, types of masks used and whether the participant was a healthcare worker, were distributed to patients in 12 hospitals. Dermatologists assessed skin lesions, confirmed diagnosis and recorded treatments. RESULTS Itchiness was the most frequent symptom, mostly affecting the cheeks. The most common skin disease was new-onset contact dermatitis (33.94%), followed by new-onset acne (16.97%) and worsening of pre-existing acne (16.97%). Daily wearing of masks was significantly (P = 0.02) associated with new-onset contact dermatitis. More than half of patients with pre-existing skin problems experienced disease worsening while wearing masks. Longer duration of wearing (> 6 h/day, P = 0.04) and use of cotton masks (P < 0.001) significantly increased acne flare-up. Healthcare workers had a higher incidence of skin disease. Skin lesions were generally mild and well tolerated with topical treatment. The study had some limitations: the effect of seasonal characteristics and other risk factors were not assessed, and the patients were visiting dermatological clinics and had interest in their skin status, thus, there may have been selection bias. CONCLUSION Mask-induced/-triggered dermatoses contribute to increase the dermatological burden during the pandemic.
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Affiliation(s)
- S Y Choi
- Department of Dermatology, Ilsan Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - J Y Hong
- Department of Dermatology, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Sejong, Korea
| | - H J Kim
- Department of Dermatology, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Korea
| | - G-Y Lee
- Department of Dermatology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - S H Cheong
- Department of Dermatology, Konyang University, Daejeon, Korea
| | - H J Jung
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - C H Bang
- Department of Dermatology, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - D H Lee
- Department of Dermatology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
| | - M-S Jue
- Department of Dermatology, Veterans Health Service Medical Center, Seoul, Korea
| | - H O Kim
- Department of Dermatology, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea
| | - E J Park
- Department of Dermatology, College of Medicine, Hallym University, Seoul, Korea
| | - J Y Ko
- Department of Dermatology, Hanyang University College of Medicine and Hanyang University Seoul Hospital, Seoul, Korea
| | - S W Son
- Department of Dermatology, Korea University College of Medicine, Seoul, Korea
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Jang JS, Jung HJ, Chong S, Kim DH, Kim J, Kim SO, Kim ID. 2D Materials Decorated with Ultrathin and Porous Graphene Oxide for High Stability and Selective Surface Activity. Adv Mater 2020; 32:e2002723. [PMID: 32700344 DOI: 10.1002/adma.202002723] [Citation(s) in RCA: 8] [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: 04/21/2020] [Revised: 06/22/2020] [Indexed: 06/11/2023]
Abstract
2D black phosphorus (BP) and MXenes have triggered enormous research interest in catalysis, energy storage, and chemical sensing. Unfortunately, the low stability of these materials under practical operating conditions remains a critical bottleneck, particularly as they are prone to oxidization under moisture. In this work, the design and application of stable 2D heterostructures obtained from decorating BP and MXene (Ti3 C2 Tx ) with few-layer holey graphene oxide (FHGO) membranes are presented. In the resulting heterostructured systems, FHGO serves as a multifunctional passivation layer that shields BP or MXene from oxidative degradation, while allowing the selective diffusion of target gas molecules through its micropores and toward the underlying 2D material. Through a case study of dilute NO2 sensing, it is demonstrated that these heterostructures show a greatly enhanced sensing performance under humid conditions, where fast sensing speed and response are consistently observed, and high stability is impressively retained upon repetitive sensing cycles for 1000 min. These results corroborate the efficacy of material decoration with porous FHGO membranes and suggest that this is a generalizable strategy for reliable high-performance applications of 2D materials.
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Affiliation(s)
- Ji-Soo Jang
- Applied Science Research Institute, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
| | - Hong Ju Jung
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
- National Creative Research Initiative (CRI) Center for Multi-dimensional Directed Nanoscale Assembly, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
| | - Sanggyu Chong
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
| | - Dong-Ha Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
| | - Jihan Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
| | - Sang Ouk Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
- National Creative Research Initiative (CRI) Center for Multi-dimensional Directed Nanoscale Assembly, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
| | - Il-Doo Kim
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea
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Jung HJ, Padmajan Sasikala S, Lee KE, Hwang HS, Yun T, Kim IH, Koo SH, Jain R, Lee GS, Kang YH, Kim JG, Kim JT, Kim SO. Self-Planarization of High-Performance Graphene Liquid Crystalline Fibers by Hydration. ACS Cent Sci 2020; 6:1105-1114. [PMID: 32724845 PMCID: PMC7379094 DOI: 10.1021/acscentsci.0c00467] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Indexed: 05/29/2023]
Abstract
Graphene fibers (GFs) are promising elements for flexible conductors and energy storage devices, while translating the extraordinary properties of individual graphene sheets into the macroscopically assembled 1D structures. We report that a small amount of water addition to the graphene oxide (GO) N-methyl-2-pyrrolidone (NMP) dispersion has significant influences on the mesophase structures and physical properties of wet-spun GFs. Notably, 2 wt % of water successfully hydrates GO flakes in NMP dope to form a stable graphene oxide liquid crystal (GOLC) phase. Furthermore, 4 wt % of water addition causes spontaneous planarization of wet-spun GFs. Motivated from these interesting findings, we develop highly electroconductive and mechanically strong flat GFs by introducing highly crystalline electrochemically exfoliated graphene (EG) in the wet-spinning of NMP-based GOLC fibers. The resultant high-performance hybrid GFs can be sewn on cloth, taking advantage of the mechanical robustness and high flexibility.
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Affiliation(s)
- Hong Ju Jung
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Suchithra Padmajan Sasikala
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Kyung Eun Lee
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Ho Seong Hwang
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Taeyeong Yun
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - In Ho Kim
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Sung Hwan Koo
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Rishabh Jain
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Gang San Lee
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Yun Ho Kang
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Jin Goo Kim
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Jun Tae Kim
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research
Initiative Center for Multi-Dimensional Directed Nanoscale Assembly and Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea
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Kim SW, Jeon HR, Jung HJ, Kim JA, Song JE, Kim J. Clinical Characteristics of Developmentally Delayed Children based on Interdisciplinary Evaluation. Sci Rep 2020; 10:8148. [PMID: 32424178 PMCID: PMC7235222 DOI: 10.1038/s41598-020-64875-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 04/22/2020] [Indexed: 11/30/2022] Open
Abstract
The aim of this study is to examine the clinical characteristics of children suspected to have neurodevelopmental disorders and to present features that could be helpful diagnostic clues at the clinical assessment stage. All children who visited the interdisciplinary clinic for developmental problems from May 2001 to December 2014 were eligible for this study. Medical records of the children were reviewed. A total of 1,877 children were enrolled in this study. Most children were classified into four major diagnostic groups: global developmental delay (GDD), autism spectrum disorder (ASD), developmental language disorder (DLD) and motor delay (MD). GDD was the most common (43.9%), and boys were significantly more predominant than girls in all groups. When evaluating the predictive power of numerous risk factors, the probability of GDD was lower than the probability of ASD among boys, while the probability of GDD increased as independent walking age increased. Compared with GDD and DLD, the probability of GDD was increased when there was neonatal history or when the independent walking age was late. Comparison of ASD and DLD showed that the probability of ASD decreased when a maternal history was present, whereas the probability of ASD increased with male gender. To conclude, the present study revealed the clinical features of children with various neurodevelopmental disorders. These results are expected to be helpful for more effectively flagging children with potential neurodevelopmental disorders in the clinical setting.
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Affiliation(s)
- S W Kim
- Department of Physical Medicine and Rehabilitation, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - H R Jeon
- Department of Physical Medicine and Rehabilitation, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - H J Jung
- Department of Pediatrics, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - J A Kim
- Department of Pediatrics, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - J-E Song
- Department of Psychiatry, National Health Insurance Service Ilsan Hospital, Goyang, Korea
| | - J Kim
- Department of Rehabilitation Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
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Padmajan Sasikala S, Lim J, Kim IH, Jung HJ, Yun T, Han TH, Kim SO. Graphene oxide liquid crystals: a frontier 2D soft material for graphene-based functional materials. Chem Soc Rev 2018; 47:6013-6045. [PMID: 30009312 DOI: 10.1039/c8cs00299a] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Graphene, despite being the best known strong and electrical/thermal conductive material, has found limited success in practical applications, mostly due to difficulties in the formation of desired large-scale highly organized structures. Our discovery of a liquid crystalline phase formation in graphene oxide dispersion has enabled a broad spectrum of highly aligned graphene-based structures, including films, fibers, membranes, and mesoscale structures. In this review, the current understanding of the structure-property relationship of graphene oxide liquid crystals (GOLCs) is overviewed. Various synthetic methods and parameters that can be optimized for GOLC phase formation are highlighted. Along with the results from different characterization methods for the identification of the GOLC phases, the typical characteristics of different types of GOLC phases introduced so far, including nematic, lamellar and chiral phases, are carefully discussed. Finally, various interesting applications of GOLCs are outlined together with the future prospects for their further developments.
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Affiliation(s)
- Suchithra Padmajan Sasikala
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST, Daejeon 34141, Republic of Korea.
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11
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Kim IH, Yun T, Kim JE, Yu H, Sasikala SP, Lee KE, Koo SH, Hwang H, Jung HJ, Park JY, Jeong HS, Kim SO. Mussel-Inspired Defect Engineering of Graphene Liquid Crystalline Fibers for Synergistic Enhancement of Mechanical Strength and Electrical Conductivity. Adv Mater 2018; 30:e1803267. [PMID: 30088842 DOI: 10.1002/adma.201803267] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 06/25/2018] [Indexed: 06/08/2023]
Abstract
Inspired by mussel adhesive polydopamine (PDA), effective reinforcement of graphene-based liquid crystalline fibers to attain high mechanical and electrical properties simultaneously is presented. The two-step defect engineering, relying on bioinspired surface polymerization and subsequent solution infiltration of PDA, addresses the intrinsic limitation of graphene fibers arising from the folding and wrinkling of graphene layers during the fiber-spinning process. For a clear understanding of the mechanism of PDA-induced defect engineering, interfacial adhesion between graphene oxide sheets is straightforwardly analyzed by the atomic force microscopy pull-off test. Subsequently, PDA could be converted into an N-doped graphitic layer within the fiber structure by a mild thermal treatment such that mechanically strong fibers could be obtained without sacrificing electrical conductivity. Bioinspired graphene-based fiber holds great promise for a wide range of applications, including flexible electronics, multifunctional textiles, and wearable sensors.
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Affiliation(s)
- In Ho Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Taeyeong Yun
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Jae-Eun Kim
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, 34141, Republic of Korea
- Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Hayoung Yu
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonrabuk-do, 55324, Republic of Korea
| | - Suchithra Padmajan Sasikala
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Kyung Eun Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Sung Hwan Koo
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Hoseong Hwang
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Hong Ju Jung
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Jeong Young Park
- Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon, 34141, Republic of Korea
- Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Hyeon Su Jeong
- Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Jeonrabuk-do, 55324, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
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12
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Jung HJ, Ahn JY, Lee JI, Bae JY, Kim HL, Suh HY, Youn JI, Park MY. Analysis of the number of enlarged pores according to site, age, and sex. Skin Res Technol 2018; 24:367-370. [PMID: 29393550 DOI: 10.1111/srt.12438] [Citation(s) in RCA: 5] [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: 01/01/2018] [Indexed: 11/27/2022]
Abstract
BACKGROUND Increasing the number of enlarged pores causes cosmetic problems. The difference in the number of enlarged pores according to facial site, age, and sex is unclear. OBJECTIVE To analyze the distribution of the number of enlarged pores according to facial site, age, and sex. METHODS AND MATERIALS We analyzed the number of the enlarged pores and the percentage of wrinkles in the nose, forehead, and cheek from 434 polarized images. The measurement results were analyzed according to site, age, and sex. Relationship between enlarged pore counts and wrinkle severity was also analyzed. The study was conducted by using DermaVision,™ which can take cross-polarization, parallel polarization, and ultraviolet light images. RESULTS The enlarged pores of the nose and forehead were more prominent than in the cheeks. Pore counts were increased with age, and the increment was significant between the 30's and 40's. There was no significant difference by gender. Enlarged pore counts were related to wrinkle severity. CONCLUSIONS The number of enlarged pores differs depending on body site and increased with age. The enlarged pore counts correlate with wrinkle severity and the correlation varies depending on the body site.
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Affiliation(s)
- H J Jung
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - J Y Ahn
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - J I Lee
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - J Y Bae
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - H L Kim
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - H Y Suh
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - J I Youn
- Inshine Dermatology Clinic, Seoul, Korea
| | - M Y Park
- Department of Dermatology, National Medical Center, Seoul, Korea
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13
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Padmajan Sasikala S, Lee KE, Lim J, Lee HJ, Koo SH, Kim IH, Jung HJ, Kim SO. Interface-Confined High Crystalline Growth of Semiconducting Polymers at Graphene Fibers for High-Performance Wearable Supercapacitors. ACS Nano 2017; 11:9424-9434. [PMID: 28783312 DOI: 10.1021/acsnano.7b05029] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report graphene@polymer core-shell fibers (G@PFs) composed of N and Cu codoped porous graphene fiber cores uniformly coated with semiconducting polymer shell layers with superb electrochemical characteristics. Aqueous/organic interface-confined polymerization method produced robust highly crystalline uniform semiconducting polymer shells with high electrical conductivity and redox activity. When the resultant core-shell fibers are utilized for fiber supercapacitor application, high areal/volume capacitance and energy densities are attained along with long-term cycle stability. Desirable combination of mechanical flexibility, electrochemical properties, and facile process scalability makes our G@PFs particularly promising for portable and wearable electronics.
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Affiliation(s)
- Suchithra Padmajan Sasikala
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Kyung Eun Lee
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Joonwon Lim
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Ho Jin Lee
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Sung Hwan Koo
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - In Ho Kim
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Hong Ju Jung
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Centre for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering, KAIST , Daejeon 34141, Republic of Korea
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14
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Jung HJ, Song JH, Kekatpure AL, Adikrishna A, Hong HP, Lee WJ, Chun JM, Jeon IH. The use of continuous negative pressure after open debridement for septic arthritis of the shoulder. Bone Joint J 2017; 98-B:660-5. [PMID: 27143738 DOI: 10.1302/0301-620x.98b5.36720] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Accepted: 11/11/2015] [Indexed: 12/17/2022]
Abstract
AIMS The treatment of septic arthritis of the shoulder is challenging. The infection frequently recurs and the clinical outcome can be very poor. We aimed to review the outcomes following the use of continuous negative pressure after open debridement with a large diameter drain in patients with septic arthritis of the shoulder. PATIENTS AND METHODS A total of 68 consecutive patients with septic arthritis of the shoulder underwent arthrotomy, irrigation and debridement. A small diameter suction drain was placed in the glenohumeral joint and a large diameter drain was placed in the subacromial space with continuous negative pressure of 15 cm H2O. All patients received a standardised protocol of antibiotics for a mean of 5.1 weeks (two to 11.1). RESULTS Negative pressure was maintained for a mean of 24 days (14 to 32). A total of 67 patients (98.5%) were cured without further treatment being required. At a mean follow-up of 14 months (three to 72), the mean forward flexion was 123° (80° to 140°) and the mean external rotation was 28°(10° to 40°) in those with a rotator cuff tear, and 125° (85° to 145°) and 35° (15° to 45°) in those without a rotator cuff tear. CONCLUSION Continuous negative pressure, following open arthrotomy, irrigation and debridement, was effective in treating septic arthritis of the shoulder. The rate of recurrence was significantly lower than with conventional treatment involving arthroscopic or open debridement reported in the literature. Functional outcomes, even in patients with rotator cuff tears, were excellent. TAKE HOME MESSAGE Continuous negative pressure is effective in treating septic arthritis of the shoulder. Cite this article: Bone Joint J 2016;98-B:660-5.
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Affiliation(s)
- H J Jung
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - J H Song
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - A L Kekatpure
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - A Adikrishna
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - H P Hong
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - W J Lee
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - J M Chun
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
| | - I H Jeon
- University of Ulsan, 86 Asanbyeongwon-gil, Songpa-gu, Seoul, 138-736, South Korea
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15
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Lee YS, Jung HJ, Yoon MJ. Undifferentiated embryonic cell transcription factor 1 (UTF1) and deleted in azoospermia-like (DAZL) expression in the testes of donkeys. Reprod Domest Anim 2017; 52:264-269. [PMID: 28109031 DOI: 10.1111/rda.12889] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 10/10/2016] [Indexed: 01/14/2023]
Abstract
Putative markers for each specific germ cell stage can be a useful tool to study the fate and functions of these cells. Undifferentiated embryonic cell transcription factor 1 (UTF1) is a putative marker for undifferentiated spermatogonia in humans, rats and horses. The deleted in azoospermia-like (DAZL) protein is also expressed by differentiated spermatogonia and primary spermatocytes in several species. However, whether the expression patterns of these molecular markers are identical and applicable to donkeys remains to be elucidated. The objective of this study was to investigate the expression patterns of UTF1 and DAZL in donkey testicular tissue, using immunohistochemistry (IHC). Testicular samples were collected from routine field castration of donkeys in Korea. The reproductive stages (pre- or post-puberty) of the testes were determined from the morphological characteristics of cross-sections of the seminiferous tubules. For IHC, the UTF1 and DAZL primary antibodies were diluted at 1:100 and 1:200, respectively. The immunolabelling revealed that UTF1 was expressed in approximately 50% of spermatogonia in the pre-pubertal stage, whereas its expression was limited to an early subset of spermatogonia in the post-pubertal stage. DAZL was expressed in some, but not all, spermatogonia in the pre-pubertal spermatogonia, and interestingly, its expression was also observed in spermatogonia and primary spermatocytes in the post-pubertal stage. Co-immunolabelling of the germ cells with both UTF1 and DAZL revealed three types of protein expression patterns at both reproductive stages, namely UTF1 only, DAZL only and both UTF1 and DAZL. These protein molecules were not expressed in Sertoli and Leydig cells. In conclusion, a co-immunolabelling system with UTF1 and DAZL antibodies may be used to identify undifferentiated (UTF1 only), differentiating (UTF1 and DAZL), and differentiated spermatogonia (DAZL only) in donkey testes.
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Affiliation(s)
- Y S Lee
- Department of Horse, Companion, and Wild Animal Science, Kyungpook National University, Sangju, Korea
| | - H J Jung
- Department of Animal Science and Biotechnology, Kyungpook National University, Sangju, Korea
| | - M J Yoon
- Department of Horse, Companion, and Wild Animal Science, Kyungpook National University, Sangju, Korea.,Department of Animal Science and Biotechnology, Kyungpook National University, Sangju, Korea
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Yun T, Kim JS, Shim J, Choi DS, Lee KE, Koo SH, Kim I, Jung HJ, Yoo HW, Jung HT, Kim SO. Ultrafast Interfacial Self-Assembly of 2D Transition Metal Dichalcogenides Monolayer Films and Their Vertical and In-Plane Heterostructures. ACS Appl Mater Interfaces 2017; 9:1021-1028. [PMID: 27966907 DOI: 10.1021/acsami.6b11365] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Cost effective scalable method for uniform film formation is highly demanded for the emerging applications of 2D transition metal dichalcogenides (TMDs). We demonstrate a reliable and fast interfacial self-assembly of TMD thin films and their heterostructures. Large-area 2D TMD monolayer films are assembled at air-water interface in a few minutes by simple addition of ethyl acetate (EA) onto dilute aqueous dispersions of TMDs. Assembled TMD films can be directly transferred onto arbitrary nonplanar and flexible substrates. Precise thickness controllability of TMD thin films, which is essential for thickness-dependent applications, can be readily obtained by the number of film stacking. Most importantly, complex structures such as laterally assembled 2D heterostructures of TMDs can be assembled from mixture solution dispersions of two or more different TMDs. This unusually fast interfacial self-assembly could open up a novel applications of 2D TMD materials with precise tunability of layer number and film structures.
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Affiliation(s)
- Taeyeong Yun
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Jong-Seon Kim
- Department of Chemical and Biomolecular Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Jongwon Shim
- AMOREPACIFIC Co. R&D Center , Yongin, 446-729, Republic of Korea
| | - Dong Sung Choi
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Kyung Eun Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Sung Hwan Koo
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - InHo Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Hong Ju Jung
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Hae-Wook Yoo
- Department of Chemical and Biomolecular Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Hee-Tae Jung
- Department of Chemical and Biomolecular Engineering, KAIST , Daejeon 34141, Republic of Korea
| | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science and Engineering, KAIST , Daejeon 34141, Republic of Korea
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kim JT, Jung HJ, Song H, Yoon MJ. Acrosin-binding protein (ACRBP) in the testes of stallions. Anim Reprod Sci 2015; 163:179-86. [DOI: 10.1016/j.anireprosci.2015.11.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 11/02/2015] [Accepted: 11/03/2015] [Indexed: 01/14/2023]
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Kim JY, Jung HJ, Yoon MJ. VASA (DDX4) is a Putative Marker for Spermatogonia, Spermatocytes and Round Spermatids in Stallions. Reprod Domest Anim 2015; 50:1032-8. [DOI: 10.1111/rda.12632] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 09/22/2015] [Indexed: 02/05/2023]
Affiliation(s)
- JY Kim
- Department of Animal Science; Kyungpook National University; Sangju Korea
| | - HJ Jung
- Department of Animal and Biotechnology Science; Kyungpook National University; Sangju Korea
| | - MJ Yoon
- Department of Animal and Biotechnology Science; Kyungpook National University; Sangju Korea
- Department of Horse, Companion and Wild Animal Science; Kyungpook National University; Sangju Korea
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19
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Kang M, Kim DW, Lee H, Lee YJ, Jung HJ, Paik HY, Song YJ. The nutrition contribution of dietary supplements on total nutrient intake in children and adolescents. Eur J Clin Nutr 2015; 70:257-61. [PMID: 26373959 DOI: 10.1038/ejcn.2015.156] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 06/19/2015] [Accepted: 08/03/2015] [Indexed: 12/31/2022]
Abstract
BACKGROUND/OBJECTIVES The use of dietary supplements (DSs) by children and adolescents is increasing. The aim of this study was to identify the characteristics of DS users and examine the nutritional contributions of DSs to total nutrient intakes in children and adolescents, using data obtained from a national survey. SUBJECTS/METHODS In total, 3134 subjects aged 9-18 years who participated in the 4th Korea National Health and Nutrition Examination Survey (2007-2009) were selected; the survey included 24-h recall questions on food intake and questions on DS use over the past year. Nutrient intakes from DSs were calculated using the aid of a label-based database on such supplements, and individual total nutrient intakes were derived by combining information on the foods and DSs consumed by each subject. RESULTS There were 895 DS users (28.5%), 85.2% of whom (n=577) had complete DS nutrient information and were therefore defined as identified-DS users. Identified-DS users were slightly younger and had a greater household income and better nutritional knowledge than did non-users. The most frequently consumed type of supplement was a 'multivitamin and minerals' complex. For total nutrient intake, identified-DS users had a significantly higher intake of most of the nutrients, except for macronutrient and sodium than non-users. In all identified-DS users, the contribution of vitamins and minerals from DSs to total nutrient intake was higher than energy and macronutrients. CONCLUSIONS DS use by children and adolescents can improve micronutrient status, but it also increases the risk of excessive intake of certain vitamins and minerals.
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Affiliation(s)
- M Kang
- Research Institute of Human Ecology, College of Human Ecology, Seoul National University, Seoul, Republic of Korea
| | - D W Kim
- Department of Home Economics, Korea National Open University, Seoul, Republic of Korea
| | - H Lee
- Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea
| | - Y J Lee
- Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea
| | - H J Jung
- Research Institute of Human Ecology, College of Human Ecology, Seoul National University, Seoul, Republic of Korea
| | - H-Y Paik
- Research Institute of Human Ecology, College of Human Ecology, Seoul National University, Seoul, Republic of Korea.,Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea
| | - Y J Song
- Major of Food and Nutrition, School of Human Ecology, The Catholic University of Korea, Gyeonggi-do, Republic of Korea
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20
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Park OJ, Park GH, Choi JR, Jung HJ, Oh ES, Choi JH, Lee MW, Chang SE. A combination of excimer laser treatment and topical tacrolimus is more effective in treating vitiligo than either therapy alone for the initial 6 months, but not thereafter. Clin Exp Dermatol 2015; 41:236-41. [PMID: 26299799 DOI: 10.1111/ced.12742] [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] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/19/2015] [Indexed: 11/26/2022]
Abstract
BACKGROUND There are insufficient data on the long-term outcome of a combination therapy that comprises phototherapy and topical administration of tacrolimus. AIM To evaluate the clinical efficacy according to the duration of treatment and in vitro results of a combination therapy involving topical tacrolimus and an excimer laser in the treatment of vitiligo. METHODS In total, 276 patients with nonsegmental vitiligo were treated with an excimer laser twice weekly, or with tacrolimus ointment twice daily, or both. The melanin contents and levels of melanogenic enzymes were measured in cultured human melanocytes treated with tacrolimus and/or excimer laser. RESULTS After adjusting for potential confounders, the combination of tacrolimus plus excimer laser was significantly more effective than either tacrolimus or excimer laser alone (P < 0.001 and P < 0.01, respectively) for the first 6 months. However, this superiority was not observed after the initial 6 months of treatment. In vitro, the combination of tacrolimus plus excimer laser led to a higher level of melanogenesis than with either treatment alone. CONCLUSIONS A combination treatment with topical tacrolimus and an excimer laser may be useful as an induction therapy for up to 6 months, but continuation of this therapy for > 6 months might not provide a better final outcome than monotherapy.
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Affiliation(s)
- O J Park
- Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - G-H Park
- Department of Dermatology, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
| | - J R Choi
- Department of Life Sciences, Division of Life and Pharmaceutical Sciences, Center for Cell Signaling and Drug Discovery Research, Ewha Womans University, Seoul, Korea
| | - H J Jung
- Department of Life Sciences, Division of Life and Pharmaceutical Sciences, Center for Cell Signaling and Drug Discovery Research, Ewha Womans University, Seoul, Korea
| | - E S Oh
- Department of Life Sciences, Division of Life and Pharmaceutical Sciences, Center for Cell Signaling and Drug Discovery Research, Ewha Womans University, Seoul, Korea
| | - J H Choi
- Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - M W Lee
- Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S E Chang
- Department of Dermatology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Park JC, Kim SC, Lee SD, Jang HC, Kim NK, Lee SH, Jung HJ, Kim IC, Seong HH, Choi BH. Effects of Dietary Fat Types on Growth Performance, Pork Quality, and Gene Expression in Growing-finishing Pigs. Asian-Australas J Anim Sci 2014; 25:1759-67. [PMID: 25049542 PMCID: PMC4094162 DOI: 10.5713/ajas.2012.12416] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Revised: 09/16/2012] [Accepted: 09/04/2012] [Indexed: 11/27/2022]
Abstract
This study was performed to determine the effects of dietary fat sources, i.e., beef tallow, soybean oil, olive oil and coconut oil (each 3% in feed), on the growth performance, meat quality and gene expression in growing-finishing pigs. A total of 72 crossbred pigs (Landrace×Large White×Duroc) were used at 71±1 kg body weight (about 130 d of age) in 24 pens (320×150 cm) in a confined pig house (three pigs per pen) with six replicate pens per treatment. The growing diet was given for periods of 14±3 d and the finishing diet was given for periods of 28±3 d. The fat type had no significant effect either on growth performance or on chemical composition or on meat quality in growing-finishing pigs. Dietary fat type affected fatty acid composition, with higher levels of unsaturated fatty acids (UFAs) and monounsaturated fatty acids (MUFAs) in the olive oil group. Microarray analysis in the Longissimus dorsi identified 6 genes, related to insulin signaling pathway, that were differentially expressed among the different feed groups. Real time-PCR was conducted on the six genes in the longissimus dorsi muscle (LM). In particular, the genes encoding the protein kinase, cAMP-dependent, regulatory, type II, alpha (PRKAR2A) and the catalytic subunit of protein phosphatase 1, beta isoform (PPP1CB) showed the highest expression level in the olive oil group (respectively, p<0.05, p<0.001). The results of this study indicate that the type of dietary fat affects fatty acid composition and insulin signaling-related gene expression in the LM of pigs.
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Affiliation(s)
- J C Park
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - S C Kim
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - S D Lee
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - H C Jang
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - N K Kim
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - S H Lee
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - H J Jung
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - I C Kim
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - H H Seong
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
| | - B H Choi
- Division of Animal Genomics & Bioinformatics, National Institute of Animal Science, Rural Development Administration, Chuksan gil 77, Kwonsun-gu, Suwon, Korea
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Kang M, Kim DW, Baek YJ, Moon SH, Jung HJ, Song YJ, Paik HY. Dietary supplement use and its effect on nutrient intake in Korean adult population in the Korea National Health and Nutrition Examination Survey IV (2007-2009) data. Eur J Clin Nutr 2014; 68:804-10. [PMID: 24824011 DOI: 10.1038/ejcn.2014.77] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 03/06/2014] [Accepted: 03/19/2014] [Indexed: 01/08/2023]
Abstract
BACKGROUND/OBJECTIVES Although there is an increasing trend of dietary supplement (DS) use, few researches have evaluated nutrient intake from DS. This study aimed to establish a nutrient database (NDB) for DS and estimate the effect of DS on total nutrient intake by Korean adults. SUBJECTS/METHODS The NDB for DS was established using the label information of products reported in the Korea National Health and Nutrition Examination Survey (KNHANES) IV. Of the 16,031 participants who were ≥20 years old, 2053 products were reported as being taken by 5606 subjects. But nutrient composition could be identified by searching product name only in 1158 products consumed by 3844 subjects (DS users). Total nutrient intake of DS users was obtained by combining intakes from diet and DS. RESULTS Dietary supplement use was higher in women, in middle-aged people and in those with higher education and low smoking and drinking preferences. Nutrients obtained from food were higher in DS users than in nonusers for most nutrients, particularly in women. When total nutrient intake was evaluated in DS users, the percentage of subjects whose intake was below the estimated average requirement for Koreans decreased for several vitamins and minerals, but the percentage of subjects whose intake was above the tolerable upper intake levels increased for vitamin A, vitamin C and iron. CONCLUSIONS The newly developed NDB for DS will be an important resource for more accurate assessment of nutrient intake as well as evaluation of the relationship between nutrition and health. Further research is needed to update a more comprehensive NDB applicable to diverse populations.
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Affiliation(s)
- M Kang
- Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea
| | - D W Kim
- Health Policy Research Department, Korea Institute for Health and Social Affairs, Seoul, Republic of Korea
| | - Y J Baek
- Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea
| | - S-H Moon
- Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea
| | - H J Jung
- Research Institute of Human Ecology, College of Human Ecology, Seoul National University, Seoul, Republic of Korea
| | - Y J Song
- Department of Food Science and Nutrition, Catholic University, Bucheon, Republic of Korea
| | - H-Y Paik
- 1] Department of Food and Nutrition, Seoul National University, Seoul, Republic of Korea [2] Research Institute of Human Ecology, College of Human Ecology, Seoul National University, Seoul, Republic of Korea
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Bae KH, Park JS, Jung HJ, Shin HS. Inguinal approach for the management of unilateral non-palpable testis: is diagnostic laparoscopy necessary? J Pediatr Urol 2014; 10:233-6. [PMID: 24206784 DOI: 10.1016/j.jpurol.2013.09.022] [Citation(s) in RCA: 17] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Accepted: 09/19/2013] [Indexed: 11/24/2022]
Abstract
OBJECTIVE During the last decade laparoscopy has increasingly been advocated as the primary investigative procedure for the management of the non-palpable testis. We reviewed the medical records in a consecutive series of boys with non-palpable testis to examine the contribution of the initial inguinal approach in the management of unilateral non-palpable testis. MATERIALS AND METHODS Among the 183 consecutive patients with cryptorchidism from 2003 to 2012, there were 21 patients with unilateral and three with bilateral non-palpable testes. All unilateral patients then underwent inguinal and scrotal exploration through an inguinal incision. For those patients with an intra-abdominal peeping testis, the gonad was placed into the scrotum after meticulous cranial mobilization of the spermatic cord. RESULTS Patient age ranged from 11 months to 144 months (mean age: 23 months). Among the 21 unilateral cases, testicular absence or atrophy was confirmed in seven patients with a scrotal nubbin in six, and blind-ending vas and vessels at the external inguinal ring in one patient. Among the remaining 14 patients with sizeable testes, 12 testes were intra-abdominal peeping testes and two testicles were seen within the distal inguinal canal, which may be missed on physical examination owing to patient obesity. The intra-abdominal peeping testicle had the opened processus vaginalis entering the internal ring in which testicle was found. These were fixed into the scrotum successfully by cranial mobilization of spermatic vessel sometimes cutting the internal oblique muscle and by Prentiss and Fowler-Stephen's maneuver. Diagnostic laparoscopy was done on three patients with bilateral cases. CONCLUSIONS Given the result that most of nubbins are within the scrotum and testes with intra-abdominal peeping testes are fixed down safely into the scrotum, the inguinal approach may suffice for the management of unilateral non-palpable testis. Laparoscopy should be reserved for patients with bilateral non-palpable undescended testes.
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Affiliation(s)
- K H Bae
- Department of Urology, Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - J S Park
- Department of Urology, Daegu Catholic University Medical Center, Daegu, Republic of Korea.
| | - H J Jung
- Department of Urology, Daegu Catholic University Medical Center, Daegu, Republic of Korea
| | - H S Shin
- Department of Urology, Daegu Catholic University Medical Center, Daegu, Republic of Korea
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Jung HJ, Ganesan P, Lee SJ, Kwak HS. Comparative study of flavor in cholesterol-removed Gouda cheese and Gouda cheese during ripening. J Dairy Sci 2013; 96:1972-1983. [PMID: 23462162 DOI: 10.3168/jds.2012-5644] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 01/02/2013] [Indexed: 11/19/2022]
Abstract
This study was performed to compare the flavor compounds of cholesterol-removed Gouda cheese (CRGC) and those of Gouda cheese (control) during ripening. The CRGC was made using milk treated with cross-linked β-cyclodextrin (β-CD). The solid-phase microextraction (SPME) method was used to extract flavor compounds from Gouda cheese. In both CRGC and control cheese, 31 flavor compounds were identified, including 6 free fatty acids, 5 esters, 5 ketones, 1 aldehyde, 3 lactones, 5 alcohols, and 6 miscellaneous compounds. Free fatty acids were the most abundant flavor compounds quantified in CRGC and control cheese. In the early stage of ripening, concentrations of flavor compounds in CRGC and control cheese were 16.42 and 10.38 mg/kg, respectively. At 6 mo, they increased to 40.90 and 67.89 mg/kg, respectively. A group of esters was the second abundant flavor compound in CRGC and control cheese. At the initial stage of ripening, total concentrations of esters were 12.94 (CRGC) and 10.95 mg/kg (control) and they increased to 22.73 (CRGC) and 27.68 mg/kg (control). Total concentrations of ketones were 1.96 (CRGC) and 6.49 mg/kg (control) at the initial stage of ripening. After 6 mo of ripening, total concentrations reached 11.32 (CRGC) and 52.43 mg/kg (control). In the case of the lactones, at the early stage of ripening, total concentrations of CRGC and control cheese were 0.63 and 0.84mg/kg, respectively, and then increased to 1.73 (CRGC) and 3.25mg/kg (control) at the end of ripening. Based on the results of this study, the flavor compounds of CRGC and control showed slightly different profiles during ripening.
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Affiliation(s)
- H J Jung
- Department of Food Science and Technology, Sejong University, Seoul 143-747, Korea
| | - P Ganesan
- Department of Food Science and Technology, Sejong University, Seoul 143-747, Korea
| | - S J Lee
- Department of Food Service Management, Sejong University, Seoul 143-747, Korea
| | - H S Kwak
- Department of Food Science and Technology, Sejong University, Seoul 143-747, Korea.
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Jung HJ, Kim JB, Im KS, Cho HJ, Kim JW, Lee JM. Effects of a priming dose of fentanyl during anaesthesia on the incidence and severity of fentanyl-induced cough in current, former and non-smokers. J Int Med Res 2012; 39:2379-84. [PMID: 22289557 DOI: 10.1177/147323001103900638] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Fentanyl is commonly used during anaesthesia and can cause fentanyl-induced cough (FIC). This study investigated whether a priming dose of fentanyl reduced FIC, and determined the factors associated with increased risk of FIC. Subjects undergoing elective surgery under general anaesthesia (n = 800) were randomized into four groups: group 1 received 2 μg/kg fentanyl bolus; groups 2, 3 and 4 received a priming dose of fentanyl 0.5 μg/kg followed by 1.5 μg/kg after 1, 2 or 3 min, respectively. The incidence of FIC was 17.0%, 10.0%, 12.5% and 11.5% for groups 1, 2, 3 and 4, respectively, with no significant between-group differences in FIC incidence or severity. The mean FIC onset time was 22 s. Former smokers were 2.91 times more likely than current smokers to experience cough. A fentanyl priming dose did not reduce the incidence and severity of FIC. Former smokers were hyper-reactive to fentanyl compared with current smokers.
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Affiliation(s)
- H J Jung
- Department of Anaesthesiology and Pain Medicine, Uijeongbu St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Abstract
We analyzed the outcomes of our conservative treatment for pediatric trigger thumb. Since March 2004, we have used conservative treatment for all patients with pediatric trigger thumb. We prospectively analyzed 30 patients in whom 35 thumbs were affected (10 right, 15 left, 5 bilateral). The mean age at diagnosis was 28 (11-50) months. The treatment consisted of passive exercises performed by the children's mothers, 10-20 times daily. How reliably this was performed is unproven. Trigger thumb severity was graded as 0A (extension beyond 0°), 0B (extension to 0°), 1 (active extension with triggering), 2 (passive extension with triggering), and 3 (cannot extend either actively or passively i.e. locked). At diagnosis, six of the 35 thumbs (17%) were grade 1, 25 (71%) were grade 2, and four (11%) were grade 3. After a mean follow-up period of 63 (range, 49-73) months, 28 thumbs (80%) were grade 0A or 0B, 5 (14%) were grade 1 and 2 (6%) were grade 2. The bilateral cases and the patients who initially had grade 3 severity had significantly more unfavorable results than the other patients. This study suggests that conservative treatment for pediatric trigger thumb is a successful method, although cases that present with bilateral involvement or locking (grade 3) should be considered for early surgical release.
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Affiliation(s)
- H J Jung
- Department of Orthopedic Surgery, Medical Center of Chung-Ang University School of Medicine, Seoul, Korea
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Park KH, Kim SN, Lee SY, Jeong EH, Jung HJ, Oh KJ. Comparison between sonographic cervical length and Bishop score in preinduction cervical assessment: a randomized trial. Ultrasound Obstet Gynecol 2011; 38:198-204. [PMID: 21484904 DOI: 10.1002/uog.9020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To compare sonographically measured cervical length with the Bishop score in determining the requirement for prostaglandin administration for preinduction cervical ripening in nulliparae at term. METHODS One hundred and fifty-four women with singleton pregnancies at term who were scheduled for induction of labor were randomly assigned to receive prostaglandin for preinduction cervical ripening based on the Bishop score or sonographic cervical length. A cervix unfavorable for treatment with prostaglandin for preinduction cervical ripening was defined as having either a Bishop score of ≤ 4 or a cervical length of ≥ 28 mm. The primary outcome measures were induction success (defined as an ability to achieve the active phase of labor) and the percentage of patients treated with prostaglandin for preinduction cervical ripening. RESULTS The two groups were similar with respect to maternal demographics, gestational age, cervical length, and Bishop score. The rates of induction success and Cesarean delivery, the interval to active phase of labor, and the interval to delivery were also similar in the two groups. However, in the transvaginal ultrasound group (n = 77), prostaglandin was administered to only 36% of the nulliparae compared with 75% of those in the Bishop score group (n = 77) (P < 0.0001). CONCLUSION In comparison with the Bishop score, the use of sonographic cervical length for assessing the cervix prior to induction of labor can reduce the need for prostaglandin administration by approximately 50% without adversely affecting the outcome of induction in nulliparae at term if the cut-off values used are a Bishop score of ≤ 4 and a cervical length of ≥ 28 mm.
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Affiliation(s)
- K H Park
- Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnamsi, Korea.
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Jung HJ, Sir JJ, Lee HK, Kang YK, Song BG, Choi SK. Very late thrombosis of sirolimus-eluting stent despite dual antiplatelet therapy for 4 years in a patient with lung cancer. Minerva Cardioangiol 2011; 59:113-116. [PMID: 21285937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Jung HJ, Park KH, Kim SN, Hong JS, Oh KJ, Kim G, Kwon JY. Non-invasive prediction of intra-amniotic inflammation in women with preterm labor. Ultrasound Obstet Gynecol 2011; 37:82-87. [PMID: 21031346 DOI: 10.1002/uog.8869] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To develop a model based on non-invasive variables to predict the probability of intra-amniotic inflammation in women with preterm labor and intact membranes. METHODS Transvaginal ultrasonography and digital examination for the assessment of cervical length and cervical dilatation were performed, and maternal blood was collected for the determination of C-reactive protein and white blood cell (WBC) count immediately after amniocentesis in 153 consecutive women with preterm labor. Amniotic fluid obtained by amniocentesis was cultured for aerobic and anaerobic bacteria and mycoplasmas, and the WBC was determined. Intra-amniotic inflammation was defined as an elevated amniotic fluid interleukin-6 concentration (> 2.6 ng/mL). Receiver-operating characteristics (ROC) curves and logistic regression analysis were used for statistical analysis. RESULTS The prevalence of a positive amniotic fluid culture was 7.2% (11/153) and the prevalence of intra-amniotic inflammation was 19.6% (30/153). The final logistic regression model was based on non-invasive clinical variables, including gestational age at assessment, cervical length and maternal blood WBC count, which were the best predictors of intra-amniotic inflammation. The model was shown to have an adequate goodness of fit (P = 0.754), and the area under the ROC curve was 0.724, indicating reasonably good discrimination. CONCLUSION In women with preterm labor and intact membranes, the risk for intra-amniotic inflammation can be predicted non-invasively with a risk score based on gestational age, cervical length and maternal blood WBC count.
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Affiliation(s)
- H J Jung
- Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnamsi, Korea
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Kang WS, Park KH, Kim SN, Shin DM, Hong JS, Jung HJ. Degree of cervical shortening after initial induction of labor as a predictor of subsequent successful induction. Ultrasound Obstet Gynecol 2010; 36:749-754. [PMID: 20205152 DOI: 10.1002/uog.7617] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/19/2010] [Indexed: 05/28/2023]
Abstract
OBJECTIVE To evaluate whether the degree of cervical length shortening is valuable in predicting the success of serial induction of labor on the second day in women in whom it failed on the first day, and to compare its performance with that of cervical length. METHODS This was a prospective observational study. We enrolled 92 consecutive women with singleton gestations at > 34.0 weeks' gestation who failed labor induction on the first day of serial induction. Transvaginal sonographic measurement of cervical length and determination of the Bishop score were undertaken before performing each labor induction on the first and second days. RESULTS The overall success rate of labor induction performed on the second day was 65% (60/92). Multiple logistic regression analysis demonstrated that the degree of cervical length shortening and cervical length were significantly associated with the successful induction of labor after adjustment for body mass index, parity, use of prostaglandin and Bishop score. There were no significant differences between areas under the ROC curves for degree of cervical length shortening and cervical length. CONCLUSIONS The degree of cervical length shortening is valuable in predicting the success of induction of labor on the second day in women in whom induction failed on the first day. However, compared with sonographic cervical length it is no better at predicting the success of subsequent induction of labor.
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Affiliation(s)
- W S Kang
- Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnamsi, Korea
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Kim SN, Park KH, Jung HJ, Hong JS, Shin DM, Kang WS. Clinical and sonographic parameters at 37 weeks' gestation for predicting the risk of primary Cesarean delivery in nulliparous women. Ultrasound Obstet Gynecol 2010; 36:486-492. [PMID: 20586108 DOI: 10.1002/uog.7734] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
OBJECTIVES To identify the clinical and sonographic parameters at 37 weeks' gestation that predict the risk of Cesarean delivery in labor for nulliparas. METHODS This prospective observational study recruited nulliparas with singleton pregnancies at 37 weeks' gestation. Determination of the Bishop score, ultrasound measurement of the cervical length, and fetal biometry were performed. The clinical parameters studied were maternal age, height and weight and Bishop score. The sonographic parameters included fetal biparietal diameter, femur length, abdominal circumference (AC), estimated fetal weight (EFW), amniotic fluid index and cervical length. RESULTS Four hundred and fifty-three women were examined; 57 women (12.6%) underwent an emergency Cesarean delivery in labor. Logistic regression analysis identified maternal age and height and fetal AC and EFW, but not cervical length or Bishop score, as the best predictors of Cesarean delivery. Of these predictors, maternal age and height and fetal AC at 37 weeks were included in a final model for risk scoring. The model was shown to have an adequate goodness of fit (P = 0.473), and the area under the receiver-operating characteristics curve was 0.758, indicating reasonably good discrimination. CONCLUSIONS Maternal age and height and fetal AC and EFW at 37 weeks' gestation are the most important parameters in predicting the risk of Cesarean delivery in nulliparas; sonographic measurement of the cervical length and the Bishop score were not predictive of Cesarean delivery. A predictive model using these parameters at 37 weeks provides useful information in the decision-making process regarding the mode of delivery.
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Affiliation(s)
- S N Kim
- Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnamsi, Korea
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Varel VH, Kreikemeier KK, Jung HJ, Hatfield RD. In Vitro Stimulation of Forage Fiber Degradation by Ruminal Microorganisms with Aspergillus oryzae Fermentation Extract. Appl Environ Microbiol 2010; 59:3171-6. [PMID: 16349057 PMCID: PMC182433 DOI: 10.1128/aem.59.10.3171-3176.1993] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Aspergillus oryzae fermentation extract (Amaferm) was evaluated for its ability to influence degradation of brome grass and switchgrass fiber fractions by mixed ruminal microorganisms in vitro. Addition of Amaferm at a concentration of 0.067 mg/ml, which is approximately the concentration found in the rumen ecosystem (0.06 mg/ml), increased the degradation of brome grass neutral detergent fiber (NDF) by 28% after fermentation for 12 h (P < 0.01), but had no effect after fermentation for 24 or 48 h. The levels of degradation of both the cellulose and hemicellulose fractions were increased after fermentation for 12 h (P < 0.01). Additions of 0.08 and 8% (vol/vol) Amaferm filtrate (12.5 g/100 ml) stimulated degradation of switchgrass NDF by 12 and 24% (P < 0.01), respectively, after fermentation for 12 h; when 80% filtrate was added, degradation was decreased by 38%. The concentrations of total anaerobes in culture tubes containing 80% filtrate were 5 times greater than the concentrations in the controls; however, the concentrations of cellulolytic organisms were 3.5 times lower than the concentrations in the controls (P < 0.05). These results suggested that the filtrate contained high concentrations of soluble substrate which did not allow the cellulolytic organisms to compete well with other populations. The remaining concentrations of esterified p-coumaric and ferulic acids were lower at 12 h in NDF residues obtained from fermentation mixtures supplemented with Amaferm. Because the total anaerobes were not inhibited in fermentation mixtures containing Amaferm, antibiotics are unlikely to be involved as a mode of action for increasing NDF degradation. The possibility that Amaferm contains enzymes (possibly esterases) that may play a role in stimulating the rate of fiber degradation by mixed ruminal microorganisms by removal of plant cell wall phenolic acid esters is discussed.
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Affiliation(s)
- V H Varel
- Roman L. Hruska U.S. Meat Animal Research Center, Agricultural Research Service, U.S. Department of Agriculture, Clay Center, Nebraska 68933; Plant Science Research Unit and U.S. Dairy Forage Research Center Cluster, Agricultural Research Service, U.S. Department of Agriculture, St. Paul, Minnesota 55108 ; and U.S. Dairy Forage Research Center, Agricultural Research Service, U.S. Department of Agriculture, Madison, Wisconsin 53706
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Abstract
The sausage samples were made from pork with spent laying hen breast surimi. The samples were divided into 4 groups [sausage made from pork (control) and sausage made from pork with 20% (T1), 40% (T2), and 60% (T3) of spent laying hen breast surimi]. In proximate compositions, the moisture and ash contents of the control were higher than sausage containing spent laying hen surimi samples in all storage periods. The pH and cooking loss were higher in T3 compared with other sausage samples. However, there was no significant difference in water-holding capacity among the sausage samples, whereas shear force was significantly higher in T2. In meat color, sausage containing spent laying hen surimi samples (T1, T2, and T3) have shown to have higher lightness (L) compared with control, and redness (a) was significantly higher in control and T1. Total amino acid content and essential amino acids were increased in sausage containing spent laying hen surimi samples at 0 d of storage. In fatty acid composition, saturated fatty acid was higher in control than sausage containing spent laying hen surimi samples. Thiobarbituric acid reactive substances value was lower in sausage containing spent laying hen surimi samples than control at 2 and 4 wk of storage. Cholesterol content was lower in control compared with sausage containing spent laying hen surimi samples. In sensory evaluation, most test items were not significantly different among the sausage samples although tenderness was higher in T2 and T3 at 0 d of storage.
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Affiliation(s)
- S K Jin
- Department of Animal Resources Technology, Jinju National University, Gyeongnam, Jinju, Chilam-dong 150, Republic of Korea
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Abstract
As one of a number of p53-regulated genes, Gadd45a (growth arrest and DNA damage inducible gene) has been shown to delay carcinogenesis and decrease mutation frequency. Gadd45a is known to regulate nucleotide excision DNA repair (NER) in response to UV radiation. Here, we report an emerging role for Gadd45a in base excision repair (BER). Gadd45a-null mouse embryo fibroblasts MEF and gadd45a-deficient human colon cancer cells exhibited slow BER after treatment with methyl methanesulfonate (MMS) a pure base-damaging agent. In addition, removal of AP sites by apurinic/apyrimidinic endonuclease 1/redox factor 1 (APE1/Ref1) was significantly delayed in gadd45a-null cells. Moreover, the localization of APE1/Ref1 within the nucleus was observed in gadd45a wild-type cells, whereas APE1 become mainly distributed in the cytoplasm, and there is a reduced interaction with proliferating cell nuclear antigen (PCNA) in Gadd45a-deficient cells. Inasmuch as p53 has been shown to regulate BER in addition to the NER pathway, our data suggest that p53-regulated gene Gadd45a contributes to the BER response by affecting the interaction of cellular APE1/Ref1 with PCNA. Gadd45a might be a key component gene of the p53 pathway involved in protection from carcinogenic base damage and maintenance of genomic stability, although the downstream mechanism including APE1/Ref1 will need further study.
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Affiliation(s)
- H J Jung
- Department of Pharmacology, Institute for Basic Medical Science (IBMS), School of Medicine, Kyung Hee University, Dongdaemun-gu, Seoul, South Korea
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Bai SW, Jung HJ, Jeon MJ, Chung DJ, Kim SK, Kim JW. Surgical repair of anterior wall vaginal defects. Int J Gynaecol Obstet 2007; 98:147-50. [PMID: 17572421 DOI: 10.1016/j.ijgo.2007.04.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2006] [Revised: 03/29/2007] [Accepted: 04/11/2007] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To compare the clinical efficacy of 3 surgical procedures for central types of anterior vaginal wall defect. METHODS A total of 138 patients diagnosed with central types of anterior vaginal wall defect who underwent classic transvaginal repair (n=72), transvaginal repair with polypropylene mesh (n=28), and internal repair (n=38) were followed up for at least 1 year. RESULTS There were no differences in development of fever, vaginal erosion, detrusor overactivity, and voiding difficulty among the 3 groups, but the incidence of postoperative urinary tract infections was significantly higher in the polypropylene mesh repair group. The difference in preoperative and postoperative hemoglobin levels and wound infection incidence were significantly higher in the internal repair group. Moreover, the recurrence rate of the anterior vaginal wall defect was significantly higher at 1 year in the internal repair group. CONCLUSION Transvaginal surgical repair seems to be more efficacious than internal surgical repair for central types of anterior vaginal wall defects.
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Affiliation(s)
- S W Bai
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Shinchon-dong, 134 Seodaemun-gu, Seoul 120-752, Korea.
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Lee YJ, Yu SL, Jung KC, Jung HJ, Kim KS, Park CS, Jin DI, Lee JH. Assignment of cellular retinoic acid-binding protein 1 (CRABP1) and 2 (CRABP2) to porcine chromosome 7q12-->q23 and 4q21-->q23 by somatic cell and radiation hybrid panel mapping. Cytogenet Genome Res 2005; 112:180B. [PMID: 16276655 DOI: 10.1159/000087534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Y J Lee
- Division of Animal Science and Resources, Research Center for Transgenic Cloned Pigs, Chungnam National University, Daejeon, Korea
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Lee KW, Park JB, Yoon JJ, Lee JH, Kim SY, Jung HJ, Lee SK, Kim SJ, Lee HH, Lee DS, Joh JW. The viability and function of cryopreserved hepatocyte spheroids with different cryopreservation solutions. Transplant Proc 2004; 36:2462-3. [PMID: 15561281 DOI: 10.1016/j.transproceed.2004.08.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We sought to evaluate the viability and function of cryopreserved hepatocyte spheroids using different cryopreservation solutions in order to elucidate the efficiency of cryopreservation. Hepatocytes isolated from a Sprague-Dawley rat were formed into spheroids by 24 hours of rotational culture. The spheroids were cryopreserved using a programmed linear freezer in a liquid nitrogen tank for 24 hours in four different cryopreservation solutions: UW solution (UW), William E media (WE), fetal bovine serum (FBS), and a mixture (MIX). After thawing, they were cultured for 4 days. With each hepatocyte spheroid, the viability using the MTT assay and hepatocyte-specific functions, such as ammonia clearance, urea nitrogen synthesis, and albumin secretion, were analyzed. The viabilities of cryopreserved hepatocyte spheroids were 64.8% +/- 10.2% (UW), 33.2% +/- 9.7% (WE), 69.3% +/- 8.7% (FBS), and 48.4% +/- 15.5% (MIX). Ammonia clearance of spheroids cyropreserved in UW solution was 0.93 +/- 0.13 mmol/L per well per day, which was not significantly different from freshly cultured spheroids. From the aspect of urea nitrogen synthesis, spheroids cryopreserved with UW, FBS, and MIX solution were not significantly different from freshly cultured spheroids. The amount of albumin secretion by the UW cryopreserved spheroids was significantly greater than that of other cryopreserved spheroids. Cryopreserved hepatocyte spheroids in UW solution were not significantly different from freshly cultured spheroids with respect to viability and function. UW solution was superior to other cryopreservation solutions for viability and functions.
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Affiliation(s)
- K W Lee
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea
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Lee KW, Yoon JJ, Lee JH, Kim SY, Jung HJ, Kim SJ, Joh JW, Lee HH, Lee DS, Lee SK. Sustained release of vascular endothelial growth factor from calcium-induced alginate hydrogels reinforced by heparin and chitosan. Transplant Proc 2004; 36:2464-5. [PMID: 15561282 DOI: 10.1016/j.transproceed.2004.08.078] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A possible alternative for immunosuppression is a microencapsulation technique using hydrogels, which have been utilized for cell immobilization and drug delivery systems. Angiogenesis is crucial for delivery of the metabolic products to the host tissues as well as to supply oxygen and nutrients to cells. The local delivery of angiogenic growth factors, such as VEGF and basic FGF, has been recently studied to enhance angiogenesis on peripheral tissue of graft. In this study, we evaluated sustained VEGF release with a model using hydrogels coated with chitosan and heparin in vitro. We fabricated calcium alginate gels and chitosan-coated calcium alginate gels. Heparinized chitosan-coated calcium-induced alginate hydrogel beads were prepared by soaking chitosan-coated calcium alginate gels in heparin solution. We compared the stability and VEGF release manner between three kinds of hydrogels. To compare the stability, 5 mL of each hydrogel was incubated with 20 mL PBS under the rotational culture. Compression forces were measured using a rheometer. The amount of VEGF released from the gels was measured by ELISA. The heparin-coated chitosan alginate hydrogels showed the highest surface stability among the three hydrogels. VEGF from the heparinized gel was released in sustained manner up to 10 days in vitro. Chitosan-coated alginate gels released 90% of loaded VEGF within 5 days. These results suggest that local delivery of VEGF using a heparinized hydrogel may provide a long-term supply of angiogenic growth factor that might induce new vessel formation in vivo.
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Affiliation(s)
- K W Lee
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Shin SS, Jin M, Jung HJ, Kim B, Jeon H, Choi JJ, Kim JM, Cho BW, Chung SH, Lee YW, Song YW, Kim S. Suppressive effects of PG201, an ethanol extract from herbs, on collagen-induced arthritis in mice. Rheumatology (Oxford) 2003; 42:665-72. [PMID: 12709543 DOI: 10.1093/rheumatology/keg209] [Citation(s) in RCA: 29] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE PG201 has been formulated using 12 herbs known to have anti-inflammatory and protective effects on damaged tissue and bone among other functions. The present study was done in order to assess the therapeutic effects of PG201 in collagen-induced arthritis (CIA) in mice. METHODS DBA/1 mice were immunized with bovine type II collagen. After a second collagen immunization, mice were treated with PG201 orally at 10 mg/kg once a day for 18 days. Paws were evaluated macroscopically for redness, swelling and deformities. The levels of TNF-alpha and IL-1beta in the ankle were examined. The severity of arthritis within the knee joints was evaluated by histological assessment of cartilage destruction and pannus formation. Molecular indicators related to CIA pathology were analysed by measuring the serum levels of matrix metalloproteinase 2 (MMP-2), tissue inhibitor of matrix metalloproteinase 2 (TIMP-2) and the anti-inflammatory cytokines interleukin (IL)-4 and IL-10. RESULTS Administration of PG201 significantly suppressed the progression of CIA and inhibited the production of TNF-alpha and IL-1beta in the paws. The erosion of cartilage was dramatically reduced in mouse knees after treatment with PG201. In the serum of PG201-treated mice, the level of TIMP-2 and the ratio of TIMP-2 to MMP-2 were significantly elevated, and the level of IL-4, but not of IL-10, was increased. CONCLUSION Administration of PG201 has therapeutic effects on CIA. Protection of cartilage was particularly prominent. PG201 is a potential therapy for rheumatoid arthritis.
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Affiliation(s)
- S S Shin
- PanGenomics Co. Limited, Biotechnology Incubating Center, Seoul National University, Seoul 151-742, Korea
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Choi J, Lee KT, Ka H, Jung WT, Jung HJ, Park HJ. Constituents of the essential oil of the Cinnamomum cassia stem bark and the biological properties. Arch Pharm Res 2001; 24:418-23. [PMID: 11693543 DOI: 10.1007/bf02975187] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.0] [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: 10/21/2022]
Abstract
GC-MS analysis on the essential oil (CC-oil) of Cinnamomum cassia stem bark led to the identification of cinnamaldehyde (CNA, 1), 2-hydroxycinnamaldehyde (2-CNA), coumarin (2), and cinnamyl acetate. The major volatile flavor in CC-oil was found to be 2-CNA. Coumarin was first isolated from this plant by phytochemical isolation and spectroscopic analysis. CNA and CC-oil showed potent cytotoxicity, which was effectively prevented by N-acetyl-L-cysteine (NAC) treatment. Intraperitoneal administration with CNA considerably decreased malondialdehyde (MDA) formation and glutathione S-transferase activity in rats. These results suggest that CC-oil and CNA can regulate the triggering of hepatic drug-metabolizing enzymes by the formation of a glutathione-conjugate.
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Affiliation(s)
- J Choi
- College of Pharmacy, Kyungsung University, Pusan 608-736, Korea
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Shin SY, Park EJ, Yang ST, Jung HJ, Eom SH, Song WK, Kim Y, Hahm KS, Kim JI. Structure-activity analysis of SMAP-29, a sheep leukocytes-derived antimicrobial peptide. Biochem Biophys Res Commun 2001; 285:1046-51. [PMID: 11467858 DOI: 10.1006/bbrc.2001.5280] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
SAMP-29 is a cathelecidin-derived antimicrobial peptide deduced from sheep myeloid mRNA. To elucidate the structural-activity relationship of SMAP-29, several analogues were synthesized and their antibiotic activity was investigated. Compared to parental SMAP-29, SMAP-29(1-17) and [K(22,25,27)]-SMAP-29 retained relatively effective antimicrobial activity (MIC: 1.0-8.0 microM), but resulted in a complete loss of hemolytic activity. Pro-19 --> Ala substitution ([A19]-SMAP-29) in SMAP-29 induced a significant reduction in antibacterial activity. These results suggested that the N-terminal amphipathic alpha-helical region and the C-terminal hydrophobic region of SMAP-29 are responsible for antimicrobial activity and hemolytic activity, respectively, and the central Pro-19 in SMAP-29 plays a critical role in showing improved antibacterial activity. In particular, [K(2,7,13)]-SMAP-29(1-17) showed potent antimicrobial activity under high salt conditions without hemolytic activity. Thus, this short peptide could serve as an attractive candidate for the development of therapeutic antimicrobial drugs. Structural analysis by circular dichroism suggested that SMAP-29 seems to adopt a helix-bend/turn-extended random conformation.
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Affiliation(s)
- S Y Shin
- Department of Life Science, Kwangju Institute of Science and Technology, Kwangju, 500-712, Korea
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Abstract
BACKGROUND Human studies have shown that dietary fiber affects stool composition and consistency. Because fecal incontinence has been shown to be exacerbated by liquid stools or diarrhea, management strategies that make stool consistency less loose or liquid may be useful. OBJECTIVE To compare the effects of a fiber supplement containing psyllium, gum arabic, or a placebo in community-living adults who were incontinent of loose or liquid stools. Mechanisms underlying these effects (e.g., fermentation of the fibers and water-holding capacity of stools) were examined. METHODS Thirty-nine persons with fecal incontinence of loose or liquid stools prospectively recorded diet intake and stool characteristics and collected their stools for 8 days prior to and at the end of a 31-day fiber supplementation period. During the fiber supplementation period, they ingested psyllium, gum arabic, or a placebo by random assignment. RESULTS In the baseline period, the groups were comparable on all variables measured. In the fiber supplementation period, (a) the proportion of incontinent stools of the groups ingesting the fiber supplements was less than half that of the group ingesting the placebo, (b) the placebo group had the greatest percentage of stools that were loose/unformed or liquid, and (c) the psyllium group had the highest water-holding capacity of water-insoluble solids and total water-holding capacity. The supplements of dietary fiber appeared to be completely fermented by the subjects as indicated by nonsignificant differences in total fiber, short chain fatty acids and pH in stools among the groups in the baseline or fiber supplementation periods. CONCLUSIONS Supplementation with dietary fiber from psyllium or gum arabic was associated with a decrease in the percentage of incontinent stools and an improvement of stool consistency. Improvements in fecal incontinence or stool consistency did not appear to be related to unfermented dietary fiber.
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Affiliation(s)
- D Z Bliss
- School of Nursing, University of Minnesota, Minneapolis 55455, USA.
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Kim JH, Roh JW, Kim KS, Jung HJ, Kim JW, Park NH, Song YS, Kang SB, Lee HP. p53 Codon 72 Polymorphism and Cervical Adenocarcinoma Risk in Korean Women. Cancer Res Treat 2001; 33:243-9. [PMID: 26680792 DOI: 10.4143/crt.2001.33.3.243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PURPOSE This study was undertaken to analyze whether the p53 codon 72 single nucleotide polymorphism might be correlated with the risk and/or the prognosis of cervical cancer in Korean women. MATERIALS AND METHODS Peripheral blood samples derived from patients with cervical squamous cell carcinoma (SCC) (n=68), cervical adenocarcinoma (n=37), cervical intraepithelial neoplasia (CIN) III (n=98) and normal controls (n=98) were examined. Germline genomic DNA was extracted from peripheral blood leukocytes and examined by PCR amplification of the specific alleles assay described by Storey et al.5 Statistical analysis was performed using the Chi-Square test or the Kaplan-Meier survival analysis, logistic regression analysis. RESULTS The proportions of individuals who were homozygous for the proline allele, and heterozygous for the two allele, homozygous for arginine allele in each group were 15%, 47%, 38% in the SCC group; 6%, 7%, 24% in the adenocarcinoma group; 7%, 33%, 60% in the CIN III group; and 11%, 38%, 51% in the control group. No significant difference was found between the three groups (p>0.05). However there was a significant difference in the adenocarcinoma group (p<0.05). Arg/Arg homozygote reduced the risk of adenocarcinoma. No significant difference existed in 5-year survival rates in the three groups (p=0.22 in SCC, p=0.91 in adenocarcinoma). CONCLUSION These findings suggest that Arg/Arg homozygocity of the p53 codon 72 would be a protective factor against the development of cervical adenocarcinoma.
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Park YB, Kim JY, Linton JA, Jung HJ, Lee SK, Shin DH. Clinicopathologic study of Wegener's granulomatosis with special emphasis on early lesions in 10 Korean patients. Yonsei Med J 2001; 42:46-54. [PMID: 11293501 DOI: 10.3349/ymj.2001.42.1.46] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
We reviewed ten cases of Wegener's granulomatosis with special emphasis on the characteristics of the early stage of Wegener's granulomatosis. All patients presented with nonspecific symptoms and signs, so that Wegener's granulomatosis was not initially considered. However, half of the patients had clinical or radiologic disease in the nose/or paranasal sinuses as the primary presenting problems and showed neutrophil microabscess surrounded by palisading epithelioid cells and irregularly arranged giant cells in the nasal biopsy as the most characteristic feature. Five of ten patients were believed to have a protracted superficial phenomenon before involvement of other organs, specifically the lung or kidney. Four of ten patients showed nonreactivity to ANCA test at the time of presentation. Although the number of cases reviewed in this study was small, the rate of nonreactivity to ANCA was higher than those of the larger series. The importance of early diagnosis of Wegener's granulomatosis can not be overemphasized in view of the fact that cases unrecognized clinicopathologically finally progress to full-blown systemic form of Wegener's granulomatosis with poor prognosis. The diagnosis of Wegener's granulomatosis should be based on a thorough and meticulous examination of its characteristic histologic changes in biopsied tissue particularly extravascular foci.
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Affiliation(s)
- Y B Park
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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Abstract
BACKGROUND The p16(INK4A) gene encodes 2 cell cycle regulator proteins, p16 and p14(ARF), by alternative splicing. This genetic locus also contains another cell cycle regulator gene, p15(INK4B), which encodes p15. The inactivation of the p16 protein has been demonstrated in some hepatocellular carcinomas (HCCs); however, the inactivation of the other 2 cell regulator proteins and their inactivation patterns are not well characterized. METHODS To characterize the role of the above 3 cell cycle regulator proteins in HCCs, the authors examined the genomic status of the p16(INK4A) and p15(INK4B) genes and their RNA products in 20 HCC tissues and 7 human HCC cell lines. Homozygous deletions in each exon of p16(INK4A) and p15(INK4B) were evaluated by comparative multiplex polymerase chain reaction (PCR), and the methylation status of the p16(INK4A) and p15(INK4B) promoter region was analyzed by methylation specific PCR. RESULTS Homozygous deletions were found in 6 of 20 HCCs (30%) and 2 of 7 HCC cell lines (29%). In 20 HCCs, the frequency of homozygous deletions was 20% in exon 1 of p15(INK4B), 20% in exon 2 of p15(INK4B), 10% in exon 1beta of p16(INK4A), 25% in exon 1alpha of p16(INK4A), 15% in exon 2 of p16(INK4A), and 15% in exon 3 of p16(INK4A). The authors found hypermethylation of the p16(INK4A) promoter region in 7 HCCs (35%) and 3 HCC cell lines (43%). The overall frequency of p16 alterations in HCCs, including hypermethylation and homozygous deletions, was 60% (12 of 20 cases). According to reverse transcriptase-PCR analysis, the absence of RNA expression was most frequent in p16 (11 of 20 cases, 55%) and less frequent in p15 (7 of 20 cases, 35%) and p14(ARF) (5 of 20 cases, 25%). CONCLUSIONS Among the 3 cell cycle regulator proteins encoded at the 9p21 genetic locus, inactivation of p16 is the most frequent event in HCCs in which promoter hypermethylation and homozygous deletions are the common mechanisms.
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Affiliation(s)
- M Jin
- Department of Pathology, Brain Korea 21 Projects for Medical Sciences, Yonsei University, College of Medicine, Seoul, Korea
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Shin TY, Kim SH, Kim SH, Kim YK, Park HJ, Chae BS, Jung HJ, Kim HM. Inhibitory effect of mast cell-mediated immediate-type allergic reactions in rats by Perilla frutescens. Immunopharmacol Immunotoxicol 2000; 22:489-500. [PMID: 10946827 DOI: 10.3109/08923970009026007] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We investigated the effect of aqueous extract of Perilla frutescens (Labiatae) (PFAE) on the mast cell-mediated immediate-type allergic reactions. PFAE (0.05 to 1 g/kg) dose-dependently inhibited systemic allergic reaction induced by compound 48/80 in rats. PFAE (0.1 and 1 g/kg) also significantly inhibited local allergic reaction activated by anti-DNP IgE. When PFAE was pretreated at the same concentrations with systemic allergic reaction test, the plasma histamine levels were reduced in a dose-dependent manner. PFAE (10(-3) to 1 mg/ml) dose-dependently inhibited the histamine release from rat peritoneal mast cells (RPMC) activated by compound 48/80 or anti-DNP IgE. The level of cyclic AMP in RPMC, When PFAE (1 mg/ml) was added, transiently and significantly increased about 4-fold compared with that of basal cells. Moreover, PFAE (0.001 and 0.01 mg/ml) had a significant inhibitory effect on anti-DNP IgE-induced tumor necrosis factor-alpha production. These results indicate that PFAE inhibits mast cell-mediated immediate-type allergic reactions in vivo and in vitro.
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Affiliation(s)
- T Y Shin
- College of Pharmacy, Woosuk University, Chonju, Chonbuk, South Korea
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47
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Abstract
BACKGROUND The p16(INK4A) gene encodes 2 cell cycle regulator proteins, p16 and p14(ARF), by alternative splicing. This genetic locus also contains another cell cycle regulator gene, p15(INK4B), which encodes p15. The inactivation of the p16 protein has been demonstrated in some hepatocellular carcinomas (HCCs); however, the inactivation of the other 2 cell regulator proteins and their inactivation patterns are not well characterized. METHODS To characterize the role of the above 3 cell cycle regulator proteins in HCCs, the authors examined the genomic status of the p16(INK4A) and p15(INK4B) genes and their RNA products in 20 HCC tissues and 7 human HCC cell lines. Homozygous deletions in each exon of p16(INK4A) and p15(INK4B) were evaluated by comparative multiplex polymerase chain reaction (PCR), and the methylation status of the p16(INK4A) and p15(INK4B) promoter region was analyzed by methylation specific PCR. RESULTS Homozygous deletions were found in 6 of 20 HCCs (30%) and 2 of 7 HCC cell lines (29%). In 20 HCCs, the frequency of homozygous deletions was 20% in exon 1 of p15(INK4B), 20% in exon 2 of p15(INK4B), 10% in exon 1beta of p16(INK4A), 25% in exon 1alpha of p16(INK4A), 15% in exon 2 of p16(INK4A), and 15% in exon 3 of p16(INK4A). The authors found hypermethylation of the p16(INK4A) promoter region in 7 HCCs (35%) and 3 HCC cell lines (43%). The overall frequency of p16 alterations in HCCs, including hypermethylation and homozygous deletions, was 60% (12 of 20 cases). According to reverse transcriptase-PCR analysis, the absence of RNA expression was most frequent in p16 (11 of 20 cases, 55%) and less frequent in p15 (7 of 20 cases, 35%) and p14(ARF) (5 of 20 cases, 25%). CONCLUSIONS Among the 3 cell cycle regulator proteins encoded at the 9p21 genetic locus, inactivation of p16 is the most frequent event in HCCs in which promoter hypermethylation and homozygous deletions are the common mechanisms.
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Affiliation(s)
- M Jin
- Department of Pathology, Brain Korea 21 Projects for Medical Sciences, Yonsei University, College of Medicine, Seoul, Korea
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Weimer PJ, Hackney JM, Jung HJ, Hatfield RD. Fermentation of a bacterial cellulose/xylan composite by mixed ruminal microflora: implications for the role of polysaccharide matrix interactions in plant cell wall biodegradability. J Agric Food Chem 2000; 48:1727-1733. [PMID: 10820086 DOI: 10.1021/jf991372y] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Growth of the cellulose-synthesizing bacterium Acetobacter xylinum ATCC 53524 in media supplemented with 5% (w/v) glucose and 0.2% (w/v) of a water-soluble, nearly linear xylan from tobacco stalks resulted in the synthesis of a highly crystalline composite having a xylose/glucose ratio ranging from 0.06 to 0.24. The digestion of one composite (88% cellulose/12% xylan) by mixed ruminal microflora displayed kinetics of gas production similar to those of an unassociated mixture of the two components added in a xylan/cellulose ratio similar to that of the composite. The data suggest that intimate association of xylan and cellulose, as is typically found in secondary plant cell walls, does not inhibit the rate of digestion of the component polysaccharides.
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Affiliation(s)
- P J Weimer
- U.S. Dairy Forage Research Center, Agricultural Research Service, U. S. Department of Agriculture, Madison, Wisconsin 53706, USA.
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Abstract
Bioassay-guided fractionation of Crataegus pinnatifida (Rosaceae) gave two cytotoxic ursane-type triterpenes which were identified as uvaol (1) and ursolic acid (2) by physicochemical and spectroscopic methods. 3-Oxo-ursolic acid (3) was synthesized from ursolic acid (2) by Jones method. The cytotoxic activities of these compounds were tested against murine L1210 and human cancer cell lines (A549, SK-OV-3, SK-MEL-2, XF498, and HCT15) in vitro. Compounds 1 and 2 showed moderate cytotoxicities against L1210, whereas they showed weak activities against human cancer cell lines. However, compound 3 exhibited potent cytotoxic activities both in murine and in human cancer cell lines.
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Affiliation(s)
- B S Min
- College of Pharmacy, Chungnam National University, Taejon, Korea
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Song J, Yoon YM, Jung HJ, Hong SH, Park H, Kim JQ. Plasminogen activator inhibitor-1 4G/5G promoter polymorphism and coagulation factor VII Arg353-->Gln polymorphism in Korean patients with coronary artery disease. J Korean Med Sci 2000; 15:146-52. [PMID: 10803689 PMCID: PMC3054611 DOI: 10.3346/jkms.2000.15.2.146] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
An increased risk for arterial thrombosis is associated with high plasma levels of coagulation and fibrinolytic factors such as PAI-1 and FVII. In this study, the 4G/5G polymorphism in the promoter of PAI-1 gene and Arg353-->Gln polymorphism in the FVII gene were analysed in 139 normal adults and 158 patients with coronary artery disease (CAD), and their association with plasma lipid traits was investigated. There were no significant differences in the allele frequencies of PAI-1 and FVII polymorphisms between control and patient groups. The allelic distributions of both polymorphisms in Koreans were similar to those in Japanese but significantly different from those in Caucasians. In the CAD group, the 4G homozygotes of PAI-1 polymorphism showed significantly higher levels of total (p=0.0250) and LDL cholesterol (p=0.0335) with individuals having other genotypes. However, FVII polymorphism showed no association with lipid levels. In conclusion, the 4G/5G PAI-1 promoter polymorphism and Arg353-->Gln FVII polymorphism are not major genetic risk factors for CAD in Koreans. However, 4G allele of PAI-1 polymorphism revealed to be associated with the levels of cholesterol, especially LDL cholesterol levels in CAD patients.
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Affiliation(s)
- J Song
- Department of Clinical Pathology, Seoul National University College of Medicine, Korea
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