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Ejerssa WW, Seid MG, Lim SJ, Han J, Chae SH, Son A, Hong SW. Loss of micropollutants on syringe filters during sample filtration: Machine learning approach for selecting appropriate filters. Chemosphere 2024:142327. [PMID: 38754483 DOI: 10.1016/j.chemosphere.2024.142327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 04/26/2024] [Accepted: 05/10/2024] [Indexed: 05/18/2024]
Abstract
Prefiltration before chromatographic analysis is critical in the monitoring of environmental micropollutants (MPs). However, in an aqueous matrix, such monitoring often leads to out-of-specification results owing to the loss of MPs on syringe filters. Therefore, this study investigated the loss of seventy MPs on eight different syringe filters by employing Random Forest, a machine learning algorithm. The results indicate that the loss of MPs during filtration is filter specific, with glass microfiber and polytetrafluoroethylene filters being the most effective (< 20%) compared with nylon (> 90%) and others (regenerated-cellulose, polyethersulfone, polyvinylidene difluoride, cellulose acetate, and polypropylene). The Random Forest classifier showed outstanding performance (accuracy range 0.81 to 0.95) for determining whether the loss of MPs on filters exceeded 20%. Important factors in this classification were analyzed using the SHapley Additive exPlanation value and Kruskal-Wallis test. The results show that the physicochemical properties (LogKow/LogD, pKa, functional groups, and charges) of MPs are more important than the operational parameters (sample volume, filter pore size, diameter, and flow rate) in determining the loss of most MPs on syringe filters. However, other important factors such as the implications of the roles of pH for nylon and pre-rinsing for PTFE syringe filters should not be ignored. Overall, this study provides a systematic framework for understanding the behavior of various MP classes and their potential losses on syringe filters.
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Affiliation(s)
- Wondesen Workneh Ejerssa
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea
| | - Mingizem Gashaw Seid
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Seung Ji Lim
- Water and Wastewater Research Center,K-Water Research Institute, Korea,125,Yuseong-daero 1689 beon-gil,Yuseong-gu,Daejeon,Republic of Korea
| | - Jiyun Han
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Sung Ho Chae
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Aseom Son
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Seok Won Hong
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea.
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Robinson PN, Surendran KSB, Lim SJ, Robinson M. The carbon footprint of surgical operations: a systematic review update. Ann R Coll Surg Engl 2023; 105:692-708. [PMID: 37906978 PMCID: PMC10626532 DOI: 10.1308/rcsann.2023.0057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2023] [Indexed: 11/02/2023] Open
Abstract
INTRODUCTION Sustainability in healthcare is a rapidly developing area of research with recent formal recognition from institutions around the world. We completed an update of a systematic review published in 2020. The aims of this review were to determine the reported carbon footprints of surgical operations in hospitals worldwide, identify variations in reported carbon footprints and highlight carbon hotspots associated with surgery. METHODS A systematic review was conducted in accordance with the PRISMA (Preferred Reporting Items for Systematic reviews and Meta-Analyses) guidelines. The MEDLINE®, Embase® and Cochrane Library databases were searched, and eligibility criteria applied. The study characteristics, scope of product inventory and results were extracted and synthesised. A quality assessment of each study was completed to inform the reliability of the research. RESULTS 1,308 articles were identified and 7 met the inclusion criteria for the review. The carbon footprint ranged from 28.49kg to 505.1kg carbon dioxide equivalents (CO2e). Medical devices and consumables were the greatest contributor to emissions, with material production and manufacture representing the majority of this carbon hotspot. There were significant methodological limitations and a lack of consistency in carbon footprint calculations between studies. CONCLUSIONS This systematic review identifies medical devices and consumables as the largest carbon hotspot where healthcare providers should target their sustainability initiatives. Nevertheless, the number of studies was limited and the quality of the evidence was weak. We recommend that researchers in healthcare sustainability develop international standards for conducting and reporting such studies. This would allow for comparison of individual studies and facilitate meta-analysis of cumulative evidence. A reliable evidence base is a prerequisite for identifying optimal interventions to ensure societal benefits.
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Affiliation(s)
| | | | - SJ Lim
- St George’s University Hospitals NHS Foundation Trust, UK
| | - M Robinson
- Newcastle upon Tyne Hospitals NHS Foundation Trust, UK
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Chae SH, Lim SJ, Seid MG, Ejerssa WW, Son A, Son H, Choi S, Lee W, Lee Y, Hong SW. Predicting micropollutant fate during wastewater treatment using refined classical kinetic model based on quantitative monitoring in multi-metropolitan regions of South Korea. Water Res 2023; 245:120627. [PMID: 37717334 DOI: 10.1016/j.watres.2023.120627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 09/08/2023] [Accepted: 09/11/2023] [Indexed: 09/19/2023]
Abstract
This study aimed to implement an extensive prediction model for the fate of micropollutants (MPs) in wastewater treatment plants (WWTPs). Five WWTPs equipped with seven different biological treatment processes were monitored from 2020 to 2022 with three to four sampling events in each year, and 27 datasets for 20 MPs were collected. Among these datasets, 12 were used to investigate the behavior and fate of MPs in WWTPs in South Korea. Metformin, acetaminophen, caffeine, naproxen, and ibuprofen were the MPs with the highest influent concentrations (ranging from 3,933.3-187,637.0 ng L-1) at all WWTPs. More than 90% of MPs were removed by biological treatment processes in all WWTPs. The Kruskal-Wallis test verified that their efficacy did not differ statistically (p-value > 0.05). Meanwhile, to refine the performance of the prediction model, this study optimized the biodegradation rate constants (kbio) of each MP according to the variation of seasonal water temperature. As a result, compared to the original prediction model, the mean difference between the actual data and predicted results (MEAN) decreased by 6.77%, while the Nash-Sutcliffe efficiency (NSE) increased by 0.226. The final MEAN and NSE for the refined prediction model were calculated to be 5.09% and 0.964, respectively. The prediction model made accurate predictions, even for MPs exhibiting behaviors different from other cases, such as estriol and atrazine. Consequently, the optimization strategy proposed in this study was determined to be effective because the overall removal efficiencies of MPs were successfully predicted even with limited reference datasets.
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Affiliation(s)
- Sung Ho Chae
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Seung Ji Lim
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Mingizem Gashaw Seid
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Wondesen Workneh Ejerssa
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea
| | - Aseom Son
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Heejong Son
- Water Quality Institute, Busan Water Authority, Gimhae-si, Gyeongsangnam-do 50804, Republic of Korea
| | - Sangki Choi
- Water Quality Institute, Busan Water Authority, Gimhae-si, Gyeongsangnam-do 50804, Republic of Korea; School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Woongbae Lee
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Yunho Lee
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Seok Won Hong
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea.
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Rahman E, Lee J, Lim SJ, Son A, Han J, Cho K, Hong SW. Cr-Doped FeC 2O 4 Microrods Formed Directly on AISI 420 Stainless Steel to Enhance Electrochemical NO 3- Reduction to N 2 at Circumneutral pH. ACS Appl Mater Interfaces 2023; 15:45799-45811. [PMID: 37729235 DOI: 10.1021/acsami.3c07885] [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: 09/22/2023]
Abstract
We synthesized low-cost cathodes for use in the electrochemical NO3- reduction reaction (NO3RR) via the simple reconstruction of AISI 420 stainless steel (SS). Thermochemical treatment of the SS in oxalic acid generated iron oxalate (FeC2O4) microrods (BL-SS), with further anodization affording Cr-doped Fe2O3 (R-SS) or FeC2O4 (G-SS). G-SS displayed supreme N2 selectivity during galvanostatic electrolysis at circumneutral pH. Electroanalysis and descriptor/scavenger analysis indicated that Fe sites were the primary active sites of NO3- adsorption, with C2O42- as the H-binding sites. The C2O42- ligands and Cr dopants altered the electronic structures of the Fe sites. A parametric study of the current density, pH, [NO3-]0, and [Cl-]0 indicated an Eley-Rideal N2 generation mechanism, with NO2- as an intermediate. Cl- elevated the N2 selectivity but reduced the NO3RR efficiency. To demonstrate the practical applicability of G-SS with a proposed regeneration strategy, its durability was examined in synthetic and real wastewater matrices. Compared with that in synthetic wastewater, G-SS displayed more stable performance in real wastewater owing to the natural buffering capacity at the cathode, which reduced the corrosion rate. Cr-doped FeC2O4 is viable for use in the low-cost, efficient electrochemical treatment of wastewater containing NO3-.
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Affiliation(s)
- Evandi Rahman
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea
| | - Jiho Lee
- Division of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Seung Ji Lim
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Aseom Son
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Jiyun Han
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Kangwoo Cho
- Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- Institute for Convergence Research and Education in Advanced Technology (I-CREATE), Yonsei University, Incheon 406-840, Republic of Korea
| | - Seok Won Hong
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
- Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea
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Lim SJ, Seo J, Hwang M, Kim HC, Kim EJ, Lee J, Hong SW, Lee S, Chung J. A multi-scale framework for modeling transport of microplastics during sand filtration: Bridging from pore to continuum. J Hazard Mater 2023; 443:130219. [PMID: 36367474 DOI: 10.1016/j.jhazmat.2022.130219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/17/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
The fate and transport of microplastics (MPs) during deep bed filtration were investigated using combined laboratory experiments and numerical modeling. A series of column experiments were conducted within the designated ranges of six operating parameters (i.e., size of the MP and collector, seepage velocity, porosity, temperature, and ionic strength). A variance-based sensitivity analysis, the Fourier amplitude sensitivity test, was conducted to determine the priority in affecting both the attachment coefficient at the pore scale, and the subsequent stabilized height of the breakthrough curve at the continuum scale, which follows non-monotonic trends with singularity in the size of MP (i.e., 1 µm). Finally, Damkohler numbers were introduced to analyze the dominant mechanisms (e.g., attachment, detachment, or straining) in the coupled hydro-chemical process. The robustness of conceptual frameworks bridges the gap between pore-scale interactions and the explicit MPs removal in the continuum scale, which could support decision-making in determining the priority of parameters to retain MPs during deep bed filtration.
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Affiliation(s)
- Seung Ji Lim
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea
| | - Jangwon Seo
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea
| | - Myeongwon Hwang
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea
| | - Hee-Chang Kim
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea
| | - Eun-Ju Kim
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, the Republic of Korea
| | - Jaesang Lee
- Civil, Environmental, and Architectural Engineering, Korea University, Seoul 02841, the Republic of Korea
| | - Seok Won Hong
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, the Republic of Korea
| | - Seunghak Lee
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, the Republic of Korea; Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL), Korea University, Seoul 02841, the Republic of Korea.
| | - Jaeshik Chung
- Water Cycle Research center, Korea Institute of Science and Technology (KIST), Seoul 02792, the Republic of Korea; Division of Energy and Environment Technology, KIST-School, University of Science and Technology, Seoul 02792, the Republic of Korea.
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Lim SJ, Son M, Ki SJ, Suh SI, Chung J. Opportunities and challenges of machine learning in bioprocesses: Categorization from different perspectives and future direction. Bioresour Technol 2023; 370:128518. [PMID: 36565818 DOI: 10.1016/j.biortech.2022.128518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/15/2022] [Accepted: 12/17/2022] [Indexed: 06/17/2023]
Abstract
Recent advances in machine learning (ML) have revolutionized an extensive range of research and industry fields by successfully addressing intricate problems that cannot be resolved with conventional approaches. However, low interpretability and incompatibility make it challenging to apply ML to complicated bioprocesses, which rely on the delicate metabolic interplay among living cells. This overview attempts to delineate ML applications to bioprocess from different perspectives, and their inherent limitations (i.e., uncertainties in prediction) were then discussed with unique attempts to supplement the ML models. A clear classification can be made depending on the purpose of the ML (supervised vs unsupervised) per application, as well as on their system boundaries (engineered vs natural). Although a limited number of hybrid approaches with meaningful outcomes (e.g., improved accuracy) are available, there is still a need to further enhance the interpretability, compatibility, and user-friendliness of ML models.
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Affiliation(s)
- Seung Ji Lim
- Water Cycle Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Moon Son
- Water Cycle Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea; Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea
| | - Seo Jin Ki
- Department of Environmental Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea
| | - Sang-Ik Suh
- Department of Energy System Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea
| | - Jaeshik Chung
- Water Cycle Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea; Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea.
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Lim SJ, Ki SJ, Lim JL, Lee K, Kim J, Moon J, Kim JH. Optimization of the Design Configuration and Operation Strategy of Single-Pass Seawater Reverse Osmosis. Membranes (Basel) 2022; 12:1145. [PMID: 36422138 PMCID: PMC9692277 DOI: 10.3390/membranes12111145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 11/09/2022] [Accepted: 11/14/2022] [Indexed: 06/16/2023]
Abstract
The numerical study was conducted to compare process performance depending on the pump type and process configuration. The daily monitoring data of seawater temperature and salinity offshore from Daesan, Republic of Korea was used to reflect the site-specific seawater conditions. An algorithm for reverse osmosis in constant permeate mode was developed to simulate the process in time-variant conditions. Two types of pumps with different maximum leachable efficiencies were employed to organize pump-train configuration: separated feed lines and common pressure center design. The results showed pump type and design configuration did not have a significant effect on process performance. The annual means of specific energy consumption (SEC) for every design configuration were under 2 kWh/m3, except for a worst-case. The worst-case was decided when the pump was operated out of the best operation range. The two operation strategies were evaluated to determine the optimal configuration. The permeate flow rate was reduced to 80% of the designed permeate flow rate with two approaches: feed flow rate reduction in every train and pump shutdown in a specific train. The operation mode with feed flow rate reduction was more efficient than the other. The operating pressure reduction led to a decrease in SEC.
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Affiliation(s)
- Seung Ji Lim
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
- Center for Water Cycle Research, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Seo Jin Ki
- Department of Environmental Engineering, Gyeongnam National University of Science and Technology, 33 Dongjin-ro, Jinju 52725, Republic of Korea
| | - Jae-Lim Lim
- Korea Water Resources Corporation (K-Water), Daejeon 34045, Republic of Korea
| | - Kyunghyuk Lee
- Korea Water Resources Corporation (K-Water), Daejeon 34045, Republic of Korea
| | - Jihye Kim
- Korea Water Resources Corporation (K-Water), Daejeon 34045, Republic of Korea
| | - Jeongwoo Moon
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Joon Ha Kim
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
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Seo KW, Seo J, Kim K, Ji Lim S, Chung J. Prediction of biogas production rate from dry anaerobic digestion of food waste: Process-based approach vs. recurrent neural network black-box model. Bioresour Technol 2021; 341:125829. [PMID: 34474239 DOI: 10.1016/j.biortech.2021.125829] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 08/18/2021] [Accepted: 08/19/2021] [Indexed: 05/25/2023]
Abstract
The stability of dry anaerobic digestion (AD) of food waste (FW) as well as the resulting methane gas generation was investigated from the perspective of system dynamics. Various organic loading rates were applied to the system by modifying the water content in the FW feed and solid retention time (SRT). The excessive organic loading due to the accumulation of volatile fatty acids (VFAs) from the feed with 80% water content during the short SRT (15 and 20 d) caused system failure. In contrast, more intermediate materials, such as VFAs, was easily converted into methane at higher water contents. In addition, the biogas production rate of dry AD was effectively predicted based on SRT, soluble chemical oxygen demand, total VFA, total ammonia, and free ammonia using a recurrent neural network-the so-called "black-box" model. This implies the feasibility of applying this data-based black-box model for controlling and optimizing complex biological processes.
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Affiliation(s)
- Kyu Won Seo
- Institute of Environmental Technology, ISAN Corporation, Anyang-si, Gyeonggi-do 14059, Republic of Korea
| | - Jangwon Seo
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Kyungil Kim
- ECONITY Co., Ltd., Yongin-si, Gyeonggi-do 2374-41, Republic of Korea
| | - Seung Ji Lim
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
| | - Jaeshik Chung
- Water Cycle Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea; Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), Seoul 02792, Republic of Korea.
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Kim SM, Rhyu KH, Lim SJ. Salvage of failed osteosynthesis for an atypical subtrochanteric femoral fracture associated with long-term bisphosphonate treatment using a 95° angled blade plate. Bone Joint J 2018; 100-B:1511-1517. [PMID: 30418051 DOI: 10.1302/0301-620x.100b11.bjj-2018-0306.r1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
AIMS The aim of this study was to evaluate the outcomes of a salvage procedure using a 95° angled blade plate for failed osteosynthesis of atypical subtrochanteric femoral fractures associated with the long-term use of bisphosphonates. These were compared with those for failed osteosynthesis of subtrochanteric fractures not associated with bisphosphonate treatment. PATIENTS AND METHODS Between October 2008 and July 2016, 14 patients with failed osteosynthesis of an atypical subtrochanteric femoral fracture were treated with a blade plate (atypical group). Their mean age was 67.8 years (60 to 74); all were female. During the same period, 21 patients with failed osteosynthesis of a typical subtrochanteric fracture underwent restabilization using a blade plate (typical group). Outcome variables included the time of union, postoperative complications, Harris Hip Score, and Sanders functional rating scale. RESULTS In the atypical group, union was achieved in 12 patients (85.7%) at a mean of 8.4 months (4 to 12). The mean follow-up was 31.2 months (12 to 92) The plate broke in one patient requiring further stabilization with a longer plate and strut-allograft. Another patient with failure of fixation and varus angulation at the fracture site declined further surgery. In the typical group, union was achieved in 18 patients (85.7%) at a mean of 7.9 months (4 to 12). There was no difference in the mean Harris Hip Score between the two groups (83.1 points vs 86.8 points; p = 0.522) at the time of final follow-up. Sanders functional rating scores were good or excellent in 78.6% of the atypical group and in 81.0% of the typical group. CONCLUSION The 95° angled blade plate was shown to be an effective fixation modality for nonunion of atypical subtrochanteric fractures with a high rate of union and functional improvement, comparable to those after fractures not associated with bisphosphonate treatment. Cite this article: Bone Joint J 2018;100-B:1511-17.
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Affiliation(s)
- S M Kim
- Department of Orthopaedic Surgery, Korea University Guro Hospital, Korea University School of Medicine, Seoul, South Korea
| | - K H Rhyu
- Department of Orthopedic Surgery, Kyung Hee University Hospital, College of Medicine, Kyung-Hee University, Seoul, South Korea
| | - S J Lim
- Department of Orthopedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
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Lim SJ, Sun JH, Kekatpure AL, Chun JM, Jeon IH. Rotator cuff surgery in patients with rheumatoid arthritis: clinical outcome comparable to age, sex and tear size matched non-rheumatoid patients. Ann R Coll Surg Engl 2017; 99:579-583. [PMID: 28853601 PMCID: PMC5697045 DOI: 10.1308/rcsann.2017.0107] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/23/2017] [Indexed: 11/22/2022] Open
Abstract
Aims This study aimed to compare the clinical outcomes of rotator cuff repair in patients with rheumatoid arthritis with those of patients who have no known history of the disease. We hypothesised that the functional outcomes are comparable between patients and without rheumatoid arthritis and may be affected by the level of disease activity, as assessed from C-reactive protein (CRP) level and history of systemic steroid intake. Patients and methods We conducted a retrospective review of the institutional surgical database from May 1995 to April 2012. Twenty-nine patients with rheumatoid arthritis who had rotator cuff repair were enrolled as the study group. Age, sex, and tear size matched patients with no disease who were selected as the control group. The mean duration of follow-up was 46 months (range 24-92 months). Clinical outcomes were assessed with the American Shoulder and Elbow Surgeons (ASES) questionnaire, Constant score and visual analogue scale (VAS). All data were recorded preoperatively and at regular postoperative follow-up visits. CRP was measured preoperatively as the disease activity marker for rheumatoid arthritis. Medication history was thoroughly reviewed in the study group. Results In patients with rheumatoid arthritis, all shoulder functional scores improved after surgery (ASES 56.1-78.1, Constant 50.8-70.5 and VAS 5.2-2.5; P < 0.001). The functional outcome of surgery in patients with rheumatoid arthritis was comparable to that of the control group (difference with control: ASES 78.1 vs. 85.5, P = 0.093; Constant 70.5 vs. 75.9, P = 0.366; VAS 2.5 vs. 1.8, P = 0.108). Patients with rheumatoid arthritis who had an elevated CRP level (> 1 mg/dl) showed inferior clinical outcomes than those with normal CRP levels. Patients with a history of systemic steroid intake showed inferior functional outcomes than those who had not taken steroids. Conclusions Surgical intervention for rotator cuff tear in patients with rheumatoid arthritis improved the shoulder functional outcome comparable to that in matched patients without rheumatoid arthritis. Elevated preoperative CRP level and history of systemic steroid intake portend inferior functional outcome in patients with rheumatoid arthritis.
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Affiliation(s)
- S J Lim
- Asan Medical Center, School of Medicine, University of Ulsan , Seoul , Korea
| | - J-H Sun
- Department of Orthopaedic Surgery, Hi Hospital , Incheon , Korea
| | - A L Kekatpure
- Department of Orthopaedic Surgery, Sterling Wockhardt Hospital Vashi , Navi Mumbai , India
| | - J-M Chun
- Asan Medical Center, School of Medicine, University of Ulsan , Seoul , Korea
| | - I-H Jeon
- Asan Medical Center, School of Medicine, University of Ulsan , Seoul , Korea
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Tobin WO, Kinsella JA, Kavanagh GF, O'Donnell JS, McGrath RT, Tierney S, Egan B, Feeley TM, Coughlan T, Collins DR, O'Neill D, Murphy S, Lim SJ, Murphy RP, McCabe D. Profile of von Willebrand factor antigen and von Willebrand factor propeptide in an overall TIA and ischaemic stroke population and amongst subtypes. J Neurol Sci 2017; 375:404-410. [PMID: 28320178 DOI: 10.1016/j.jns.2017.02.045] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 02/20/2017] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Von Willebrand factor propeptide (VWF:Ag II) is proposed to be a more sensitive marker of acute endothelial activation than von Willebrand factor antigen (VWF:Ag). Simultaneous data on VWF:Ag and VWF:Ag II profiles are very limited following TIA and ischaemic stroke. METHODS In this prospective, observational, case-control study, plasma VWF:Ag and VWF:Ag II levels were quantified in 164 patients≤4weeks of TIA or ischaemic stroke (baseline), and then ≥14days (14d) and ≥90days (90d) later, and compared with those from 27 healthy controls. TIA and stroke subtyping was performed according to the TOAST classification. The relationship between VWF:Ag and VWF:Ag II levels and platelet activation status was assessed. RESULTS 'Unadjusted' VWF:Ag and VWF:Ag II levels were higher in patients at baseline, 14d and 90d than in controls (p≤0.03). VWF:Ag levels remained higher in patients than controls at baseline (p≤0.03), but not at 14d or 90d after controlling for differences in age or hypertension, and were higher in patients at baseline and 90d after controlling for smoking status (p≤0.04). 'Adjusted' VWF:Ag II levels were not higher in patients than controls after controlling for age, hypertension or smoking (p≥0.1). Patients with symptomatic carotid stenosis (N=46) had higher VWF:Ag and VWF:Ag II levels than controls at all time-points (p≤0.002). There was no significant correlation between platelet activation status and VWF:Ag or VWF:Ag II levels. CONCLUSIONS VWF:Ag and VWF:Ag II levels are increased in an overall TIA and ischaemic stroke population, especially in patients with recently symptomatic carotid stenosis. VWF:Ag II was not superior to VWF:Ag at detecting acute endothelial activation in this cohort and might reflect timing of blood sampling in our study.
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Affiliation(s)
- W O Tobin
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Department of Neurology, College of Medicine, Mayo Clinic, Rochester, MN, United States
| | - J A Kinsella
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Department of Neurology, St. Vincent's University Hospital, University College Dublin, Elm Park, Dublin 4, Ireland
| | - G F Kavanagh
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - J S O'Donnell
- Irish Centre for Vascular Biology, Royal College of Surgeons of Ireland, Ireland
| | - R T McGrath
- Irish Centre for Vascular Biology, Royal College of Surgeons of Ireland, Ireland
| | - S Tierney
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Department of Vascular Surgery, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - B Egan
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Department of Vascular Surgery, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - T M Feeley
- Department of Neurology, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Department of Vascular Surgery, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - T Coughlan
- Department of Age-Related Health Care, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - D R Collins
- Department of Age-Related Health Care, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - D O'Neill
- Department of Age-Related Health Care, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - Sjx Murphy
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - S J Lim
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - R P Murphy
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland
| | - Djh McCabe
- Vascular Neurology Research Foundation, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Stroke Service, The Adelaide and Meath Hospital, Dublin, Incorporating the National Children's Hospital, Trinity College Dublin, Ireland; Department of Clinical Neurosciences, Royal Free Campus, UCL Institute of Neurology, London, UK; Academic Unit of Neurology, School of Medicine, Trinity College Dublin, Ireland.
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Kim NH, Lim SJ, Chae HM, Park YC. Complete mitochondrial genome of the Amur hedgehog Erinaceus amurensis (Erinaceidae) and higher phylogeny of the family Erinaceidae. Genet Mol Res 2017; 16:gmr-16-01-gmr.16019300. [PMID: 28198504 DOI: 10.4238/gmr16019300] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We sequenced and characterized the complete mitogenome (KX964606) of the Amur hedgehog Erinaceus amurensis to provide more data for comparative mitogenomics of the genus Erinaceus (Erinaceidae). The mitogenome of E. amurensis is a circular molecule 16,941 bp long, consisting of a control region and a conserved set of 37 genes containing 13 protein-coding genes, 22 tRNA genes, and two rRNA genes (12S rRNA and 16S rRNA). The mitogenome of E. amurensis is AT-biased, with a nucleotide composition of 33.9% A, 21.1% C, 32.6% T, and 12.4% G. The mitogenomes of E. amurensis and the closely related hedgehog species E. europaeus, excluding the control region (66.7%), share over 90% sequence similarity. According to the inter-generic relationship based on six mitogenomes described from five genera of Erinaceidae, the subfamilies Erinaceinae and Galericinae are strongly supported as monophyletic groups, with each genus well placed within its own subfamily. Within the subfamily Erinaceinae, E. amurensis is a sister species to E. europaeus, and the relationship between Hemiechinus and Erinaceus is strongly supported. Within the subfamily Galericinae, the clade of Hylomys + Neotetracus was sister to that of Echinosorex, with clades supported by high values. Our findings will help to understand the codon usage pattern and molecular evolution of E. amurensis, and provide insight into inter-generic relationships within the family Erinaceidae. In future studies, the inclusion of mitogenomes from other genera would greatly enhance our understanding of higher phylogeny within the Erinaceidae.
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Affiliation(s)
- N H Kim
- Division of Forest Science, Kangwon National University, Chuncheon, Republic of Korea
| | - S J Lim
- Division of Forest Science, Kangwon National University, Chuncheon, Republic of Korea
| | - H M Chae
- Division of Forest Science, Kangwon National University, Chuncheon, Republic of Korea
| | - Y C Park
- Division of Forest Science, Kangwon National University, Chuncheon, Republic of Korea
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Magiati I, Goh DA, Lim SJ, Gan DZQ, Leong JCL, Allison C, Baron-Cohen S, Rifkin-Graboi A, Broekman BFP, Saw SM, Chong YS, Kwek K, Gluckman PD, Lim SB, Meaney MJ. The psychometric properties of the Quantitative-Checklist for Autism in Toddlers (Q-CHAT) as a measure of autistic traits in a community sample of Singaporean infants and toddlers. Mol Autism 2015; 6:40. [PMID: 26124950 PMCID: PMC4484636 DOI: 10.1186/s13229-015-0032-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 06/03/2015] [Indexed: 12/27/2022] Open
Abstract
Background There is growing research evidence that subclinical autistic traits are elevated in relatives of individuals with autism spectrum disorder (ASD), continuously distributed in the general population and likely to share common etiology with ASD. A number of measures have been developed to assess autistic traits quantitatively in unselected samples. So far, the Quantitative-Checklist for Autism in Toddlers (Q-CHAT) is one of very few measures developed for use with toddlers as young as 18 months, but little is known about its measurement properties and factor structure. Methods The present study examined internal consistency, factor structure, test-retest stability, and convergent validity of the Q-CHAT in a sample of toddlers in Singapore whose caregivers completed the Q-CHAT at 18 (n = 368) and 24 months (n = 396). Results Three factors were derived accounting for 38.1 % of the variance: social/communication traits, non-social/behavioral traits, and a speech/language factor. Internal consistency was suboptimal for the total and speech/language scores, but acceptable for the social/communication and non-social/behavioral factor scores. Scores were generally stable between 18 and 24 months. Convergent validity was found with the Pervasive Developmental Disorders subscale of the Child Behavior Checklist (CBCL) completed by caregivers when their children were 24 months. Q-CHAT total scores in this sample were higher than those reported in other unselected samples from the UK. Conclusions The Q-CHAT was found to have a three-factor structure, acceptable internal consistency for its two main factor scores (social/communication and non-social/behavioral), normally distributed scores in an unselected sample, and similar structure and measurement properties as those reported in other published studies. Findings are discussed in relation to existing literature and future directions for the validation of the Q-CHAT.
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Affiliation(s)
- I Magiati
- Department of Psychology, National University of Singapore, #02-24, Block AS4, 9 Arts Link, 117570 Singapore, Singapore
| | - D A Goh
- Department of Psychology, National University of Singapore, #02-24, Block AS4, 9 Arts Link, 117570 Singapore, Singapore
| | - S J Lim
- Department of Psychology, National University of Singapore, #02-24, Block AS4, 9 Arts Link, 117570 Singapore, Singapore
| | - D Z Q Gan
- Department of Psychology, National University of Singapore, #02-24, Block AS4, 9 Arts Link, 117570 Singapore, Singapore
| | - J C L Leong
- Department of Psychology, National University of Singapore, #02-24, Block AS4, 9 Arts Link, 117570 Singapore, Singapore
| | - C Allison
- Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK
| | - S Baron-Cohen
- Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, UK
| | - A Rifkin-Graboi
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A STAR), Singapore, Singapore
| | - B F P Broekman
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A STAR), Singapore, Singapore ; Department of Psychological Medicine, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Singapore, Singapore
| | - S-M Saw
- Saw Swee Hock School of Public Health, National University of Singapore, National University Health System, Singapore, Singapore
| | - Y-S Chong
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A STAR), Singapore, Singapore ; Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, National University Health System, Singapore, Singapore
| | - K Kwek
- Department of Maternal Fetal Medicine, KK Women's and Children's Hospital, Singapore, Singapore
| | - P D Gluckman
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A STAR), Singapore, Singapore ; Liggins Institute, University of Auckland, Auckland, New Zealand
| | - S B Lim
- Department of Child Development, KK Women's and Children's Hospital, Singapore, Singapore
| | - M J Meaney
- Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research (A STAR), Singapore, Singapore ; Ludmer Centre for Neuroinformatics and Mental Health, McGill University, Verdun, Canada; Department of Psychiatry, Faculty of Medicine, McGill University, Montreal, Canada
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Lim SJ, Gombojav B, Jee SH, Nam CM, Ohrr H. Gender-specific combined effects of smoking and hypertension on cardiovascular disease mortality in elderly Koreans: THe Kangwha Cohort Study. Maturitas 2012; 73:331-6. [PMID: 23137791 DOI: 10.1016/j.maturitas.2012.09.002] [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] [Received: 04/17/2012] [Revised: 07/27/2012] [Accepted: 09/05/2012] [Indexed: 01/24/2023]
Abstract
OBJECTIVE We examined gender-specific combined effects of smoking and hypertension on risk of mortality from cardiovascular disease in elderly Korean men and women. STUDY DESIGN This study followed a cohort of 6097 residents (2593 men, 3504 women) in the general population of Kangwha County, aged ≥55 years in March 1985 and examined their cause-specific mortality for 20.8 years, up to December 31, 2005. All participants were followed up more than once after the 1985 survey. MAIN OUTCOME MEASURES We calculated hazard ratios for mortality for the combined sets of smoking habits and blood pressure levels using the Cox proportional-hazard model. The set of non-smokers with normal blood pressure served as a reference group. RESULTS During the 20.8 years of follow-up, 759 people died from cardiovascular disease. The risk of mortality from cardiovascular disease and stroke according to smoking or hypertension was not different between men and women. However, the risk among smokers combined with hypertension was higher in men than in women; the multivariable-adjusted hazard ratios (95% CI) for mortality from cardiovascular disease and stroke were 4.52 (1.67-12.21) and 6.37 (1.57-25.85) in men and 2.11 (1.37-3.24) and 2.41 (1.44-4.01) in women, respectively. CONCLUSIONS The magnitude of the joint effects of smoking and hypertension on cardiovascular disease and stroke mortality was different between men and women. This study suggests that combining quitting smoking with lowering blood pressure could contribute to preventing cardiovascular disease and stroke, especially in men.
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Affiliation(s)
- Seung Ji Lim
- Health Insurance Policy Research Institute, Korea National Health Insurance Corporation, Seoul, Republic of Korea.
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Lim SJ, Kim SH, Fox P. Biological nutrient and organic removal from meat packing wastewater with a unique sequence of suspended growth and fixed-film reactors. Water Sci Technol 2009; 60:3189-3197. [PMID: 19955643 DOI: 10.2166/wst.2009.603] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A unique sequence of anaerobic filter/suspended anaerobic/aerobic (AO) reactor/aerobic filter system was developed to alleviate the drawbacks of conventional suspended growth and fixed growth systems. An anaerobic filter (AF) was used to efficiently produce volatile fatty acids (VFAs) prior to the aerobic suspended growth. A second anaerobic reactor was installed in the A/O return activated sludge line to improve phosphorus uptake by potentially controlling glycogen accumulating organisms (GAOs). One biological aerobic filter (BAF) was used for nitrification followed by an anoxic filter for denitrification and a second BAF was used for effluent polishing. The meat packing wastewater had a biochemical oxygen demand (BOD) of 853 mg/L and total nitrogen (T-N) and total phosphorus (T-P) concentrations of 61.1 mg/L and 5.8 mg/L, respectively. The BOD removal efficiency was 99.0-99.7% and the suspended solids (SS) concentration in the effluent was below 10 mg/L. The T-N removal efficiency was maintained at greater than 75.0% except at low C/N ratios. A high T-P removal efficiency, 74.7-83.9%, was also obtained when the system was operated at a hydraulic retention time of 15.7 hrs. The AF successfully produced VFAs that aided in phosphorus removal. Additionally, recycled concrete aggregate used as attachment media in the biological filters continuously provided micronutrients and stabilized the pH.
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Affiliation(s)
- S J Lim
- Department of Civil, Environmental, and Sustainable Engineering, Arizona State University, Tempe, Arizona 85287, USA.
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16
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Lim SJ. Successful integration of modern multifocal IOLs into a clinical practice. Klin Monbl Augenheilkd 2008. [DOI: 10.1055/s-2008-1058001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lee EM, Hong SH, Lee YJ, Kang YH, Choi KC, Choi SH, Kim IH, Lim SJ. Liposome-complexed adenoviral gene transfer in cancer cells expressing various levels of coxsackievirus and adenovirus receptor. J Cancer Res Clin Oncol 2003; 130:169-77. [PMID: 14677059 DOI: 10.1007/s00432-003-0521-z] [Citation(s) in RCA: 20] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2003] [Accepted: 10/14/2003] [Indexed: 11/30/2022]
Abstract
PURPOSE Loss of coxsackievirus and adenovirus receptor (CAR) is frequently observed in malignant cancer, hampering adenoviral gene therapy approaches. Complexing adenovirus with cationic liposomes can increase adenoviral transgene expression, particularly in cells with CAR-deficiency. We investigated whether other factors such as lipid composition might be involved in determining the efficiency of liposome-complexed adenoviral gene transfer in cancer cells. MATERIAL AND METHODS Human cancer cell lines with different expression levels of CAR were infected with a GFP transgene. The efficiency of transgene expression was assessed by determining GFP expression using FACS analysis. RESULTS The efficiency of liposome-complexed adenoviral gene transfer was dependent on the lipid composition constituting liposomes. Polyethylene glycol (PEG)-containing liposomes were most effective in increasing liposome-complexed adenoviral gene transfer. In CAR-deficient cells, use of PEG-containing liposomes enhanced adenoviral gene transfer, whereas in CAR-expressing cells enhancement varied depending on cell type. In some CAR-expressing cells, the effect of liposome complexing was even comparable to that in CAR-deficient cells. Increased adenoviral transgene expression following complexing with PEG-containing liposomes correlated with liposome uptake in cancer cells. CONCLUSIONS Liposome-complexed adenoviral gene transfer appears to depend on lipid composition and the level of liposome uptake by cancer cells, in addition to CAR levels. Our study suggest that these multiple factors should be considered in designing liposome-complexed adenoviral vectors to improve outcomes of current adenoviral cancer gene therapies.
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Affiliation(s)
- E M Lee
- Research Institute, National Cancer Center, 809 Madu-Dong, Ilsan-gu, Goyang, Gyeonggi, Korea
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Abstract
Prolonged circulation by liposomal incorporation has been shown to enhance the therapeutic efficacy of drugs in many cases. The purpose of this study was to investigate whether the prolonged circulation of methotrexate (MTX) can be achieved by modulating the liposomal compositions. Various compositions of liposomes were prepared with 2:1 of phosphatidylcholine (PC) and cholesterol (CH) with or without distearoylphosphatidyl-ethanolamine-N-poly(ethyleneglycol) 2000 (DSPE-PEG). The MTX encapsulation efficiency depended on the type of PC used. It also appeared to increase by inclusion of DSPE-PEG. The size of liposomes decreased by the inclusion of DSPE-PEG. The inclusion of DSPE-PEG lowered the plasma-induced release of MTX from EggPC/CH and DPPC/CH liposomes, suggesting its enhancement effect on the liposomal stability. After intravenous injection to rats, the pharmacokinetics and biodistribution of MTX were significantly changed by liposomal incorporation and also by the composition of liposomes. The total body clearance of MTX incorporated in EggPC/CH, DPPC/CH, EggPC/CH/DSPE-PEG, and DPPC/CH/DSPE-PEG liposomes decreased 4.4-, 14.9-, 24.5-, and 53.1-fold, compared with that of free MTX. The ratio of MTX concentration in blood to liver and spleen after injection of DPPC/CH, EggPC/CH/DSPE-PEG, and DPPC/CH/DSPE-PEG liposomes was 5.4-, 8.5-, and 13.5-fold higher than that of EggPC/CH liposomes. Furthermore, the accumulation of MTX in the kidney, one of the organs in which MTX exhibits its toxicity, was significantly lowered by liposomal incorporation, especially by DSPE-PEG-containing liposomes. Taken together, DPPC/CH/DSPE-PEG liposomes most effectively prolonged the blood circulation, and reduced hepatosplenic and kidney uptake of MTX. DPPC/CH/DSPE-PEG liposomes may have potential as an efficient delivery system for MTX.
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Affiliation(s)
- M S Hong
- National Research Lab for Drug and Gene Delivery, College of Pharmacy, Seoul National University, Korea
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Yong CS, Choi JS, Quan QZ, Rhee JD, Kim CK, Lim SJ, Kim KM, Oh PS, Choi HG. Effect of sodium chloride on the gelation temperature, gel strength and bioadhesive force of poloxamer gels containing diclofenac sodium. Int J Pharm 2001; 226:195-205. [PMID: 11532582 DOI: 10.1016/s0378-5173(01)00809-2] [Citation(s) in RCA: 145] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Liquid suppository systems composed of poloxamers and bioadhesive polymers were easy to administer to the anus and mucoadhesive to the rectal tissues without leakage after the dose. However, a liquid suppository system containing diclofenac sodium could not be developed using bioadhesive polymers, since the drug was precipitated in this preparation. To develop a liquid suppository system using sodium chloride instead of bioadhesive polymers, the physicochemical properties such as gelation temperature, gel strength and bioadhesive force of various formulations composed of diclofenac sodium, poloxamers and sodium chloride were investigated. The mixtures of P 407 (15%) and P 188 (15-20%) existed as a liquid at room temperature, but gelled at physiological temperature. Diclofenac sodium significantly increased the gelation temperature and weakened the gel strength and bioadhesive force, while sodium chloride did the opposite. Furthermore, the poloxamer gels with less than 1.0% of sodium chloride, in which the drug was not precipitated, were inserted into the rectum of rabbits without difficulty and leakage, and retained in the rectum of rats for at least 6 h. Our results suggested that a thermosensitive liquid suppository system with sodium chloride and poloxamers was a more physically stable and convenient rectal dosage form for diclofenac sodium.
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Affiliation(s)
- C S Yong
- College of Pharmacy, Yeungnam University, 214-1 Dae-Dong, Gyongsan 712-749, South Korea
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Abstract
To enhance the liver targetability, methotrexate (MTX) was conjugated with albumin previously substituted with varying content of lactose (L0, L5, and L24). The uptake of MTX by rat hepatocytes in vitro increased according to the increase in the lactose content on the albumin conjugates. The MTX level in the plasma and various organs was determined by counting the radioactivity of [3H]MTX and by HPLC assay, separately, to monitor the in vivo fate of MTX not only as total, regardless of forms of MTX, but also as free/intact MTX level. Conjugation of MTX with albumin alone provided the enhanced delivery of MTX to the liver, accompanied by decreased accumulation in the kidney, but by increased accumulation in other nontarget organs such lung, heart, and spleen. Lactosylation of albumin conjugates further enhanced the delivery of MTX to the liver in a lactose content-dependent manner, accompanied by decreased accumulation of MTX in the lung and heart as well as kidney. The total MTX level accumulated in the liver was 2.9-, 4.1-, and 11.0-fold higher at 1 h and 5.4-, 7.0-, and 16.5-fold higher at 4 h after injection of MTX-L0, L5, L24 albumin conjugates compared with MTX alone. MTX conjugates with lactosylated albumin provided low but prolonged level of free/intact MTX in the liver. Taken together, the pharmacokinetics and liver targetability of MTX could be favorably modulated by controlling the lactose content on the albumin conjugates. Lactosylated albumin conjugation might also provide prolonged and targeted delivery of other drugs for the treatment of liver diseases.
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Affiliation(s)
- J Han
- Toxicology Research Center, Korea Research Institute of Chemical Technology, Daejon
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Kim C, Hwang YY, Chang JY, Choi HG, Lim SJ, Lee MK. Development of a novel dosage form for intramuscular injection of titrated extract of Centella asiatica in a mixed micellar system. Int J Pharm 2001; 220:141-7. [PMID: 11376976 DOI: 10.1016/s0378-5173(01)00661-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Titrated extract of Centella asiatica (TECA), a drug used in treating systemic scleroderma, is poorly water-soluble. A conventional dosage form for the intramuscular injection of TECA, propylene glycol (PG)-based TECA solution, causes severe pain after intramuscular injection. To improve the solubility of TECA and reduce pain after injection, mixed micellar systems composed of 10% surfactant mixture (Tween 20 and Tween 85) and 90% phosphate-buffered saline, pH 7.0 (PBS) were prepared. As the ratio of Tween 20 to Tween 85 increased from 0:10 to 10:0, the solubility of TECA in the mixed micellar systems increased from 7- to 26-fold compared to that in PBS (pH 7.0). The droplet size of micelles gradually decreased with the increasing ratio of Tween 20 to Tween 85 from 0:10 to 4:6, followed by an abrupt decrease in size above the ratio of 6:4. Furthermore, the micellar systems prepared with Tween 20 and Tween 85 at the ratio of 6:4, 8:2 or 10:0 could solubilize TECA more than 10 mg/ml and the resultant droplet sizes were less than 2 microm. No significant changes were observed in the droplet sizes and asiaticoside contents in these micellar formulations during storage, indicating these systems are stable for at least 60 days. Their osmotic pressures were remarkably lower than those of PG-based TECA solution and similar to that of saline solution, irrespective of dilution ratios. Most importantly, they markedly reduced the number of writhes compared with PG-based TECA solution after injection to mice. All of these results suggest that these three TECA micellar formulations prepared with Tween 20 and Tween 85 improved the solubility of TECA and reduced pain following injection, possibly due to the decrease in osmotic pressure. Thus, these micellar formulations composed of optimum ratios of Tween 20 and Tween 85 may have a potential as dosage forms for the intramuscular injection of a poorly water-soluble TECA.
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Affiliation(s)
- C Kim
- College of Pharmacy, Seoul National University, San 56-1, Shinlim-Dong, Kwanak-Ku, 151-742, Seoul, South Korea.
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Abstract
Gene therapy has emerged as a new concept of therapeutic strategies to treat diseases which do not respond to the conventional therapies. The principle of gene therapy is to introduce genetic materials into patient cells to produce therapeutic proteins in these cells. Gene therapy is now at the stage where a number of dinical trials have been carried out to patients with gene-deficiency disease or cancer. Genetic materials for gene therapy are generally composed of gene expression system and gene delivery system. For the dinical application of gene therapy in a way which conventional drugs are used, researches have been focused on the design of gene delivery system which can offer high transfection efficiency with minimal toxicity. Currently, viral delivery systems generally provide higher transfection efficiency compared with non-viral delivery systems while non-viral delivery systems are less toxic, less immunogenic and manufacturable in large scale compared with viral systems. Recently, novel strategies towards the design of new non-viral delivery system, combination of viral and non-viral delivery systems and targeted delivery system have been extensively studied. The continued effort in this area will lead us to develop gene medicine as 'gene as a drug' in the near future.
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Affiliation(s)
- C K Kim
- National Research Laboratory for Drug and Gene Delivery, College of Pharmacy, Seoul National University, Korea.
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Lim SJ, Lopez-Berestein G, Hung MC, Lupu R, Tari AM. Grb2 downregulation leads to Akt inactivation in heregulin-stimulated and ErbB2-overexpressing breast cancer cells. Oncogene 2000; 19:6271-6. [PMID: 11175341 DOI: 10.1038/sj.onc.1204014] [Citation(s) in RCA: 29] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
ErbB2 can be activated by its own overexpression or be transactivated by the heregulin polypeptide growth factor. Activation of ErbB2 leads to breast cancer cell proliferation, presumably by inducing the activation of extracellular signal-regulated kinases 1,2 (Erk1,2) and Akt. We have previously reported that the growth factor receptor bound protein-2 (Grb2) is required for the proliferation of ErbB2-overexpressing breast cancer cells. We investigated here whether Grb2 protein plays a role in heregulin-stimulated proliferation. Grb2 protein inhibition led to growth inhibition of heregulin-stimulated breast cancer cells, but not Erk1,2 inactivation. These findings are similar to our earlier observations in ErbB2-overexpressing cells. Since Akt can also be activated by heregulin, the effects of Grb2 inhibition on Akt were examined. Akt was inactivated following Grb2 downregulation in heregulin-stimulated breast cancer cells. We then examined the effects of Grb2 downregulation on Akt in ErbB2-overexpressing cells in the absence of heregulin. Similar to heregulin-stimulated cells, Grb2 inhibition also led to Akt inactivation in ErbB2-overexpressing breast cancer cells. Our results indicate that the activation of ErbB2 by heregulin or by its overexpression requires Grb2 to stimulate the Akt pathway to propagate mitogenic signals.
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Affiliation(s)
- S J Lim
- Department of Bioimmunotherapy, Section of Immunobiology and Drug Carriers, The University of Texas M.D. Anderson Cancer Center, Houston, Texas, USA
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24
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Jun EJ, Kim YO, Lim SJ, Jeon HK, Kim CJ, Han CH, Yoon SA, Bang BK. Spontaneous renal subcapsular hematoma in a patient with severe preeclampsia. Nephron Clin Pract 2000; 86:515-6. [PMID: 11124608 DOI: 10.1159/000045848] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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25
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Abstract
PURPOSE To determine whether mitomycin-C can inhibit posterior capsule opacification (PCO) without causing ocular toxicity. SETTING Yonsei Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea. METHODS Mitomycin-C dissolved in sodium hyaluronate (0.2 cc of 0.2 mg/mL) was injected into the empty capsular bag for 3 minutes after endocapsular phacoemulsification in rabbit eyes. Three months after surgery, the obstruction rate of visible light caused by PCO was measured using an optical power meter. RESULTS The mean obstruction rate of visible light was 81.0% +/- 8.3% (SD) in the control group in which sodium hyaluronate without mitomycin-C was used, 30.5% +/- 10.1% in the group in which mitomycin-C was dissolved in sodium hyaluronate, and 71.9% +/- 6.8% in the group in which mitomycin-C was dissolved in a balanced salt solution. Statistically significant differences were found among all 3 groups. CONCLUSIONS Our results suggest that the application of mitomycin-C dissolved in sodium hyaluronate effectively reduces PCO in rabbit eyes.
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Affiliation(s)
- H S Chung
- Yonsei Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
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26
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Abstract
Several techniques are used to reposition dislocated intraocular lenses (IOLs). Most place a suture loop around the end of the haptic. However, in cases of a dislocated capsular bag containing the IOL, a dislocated IOL with a large haptic, or a miotic pupil, it is not easy to see the haptic ends to place the suture loop. We describe a scleral fixation technique that uses 2 corneal tunnels. A double-armed 10-0 polypropylene suture loop can be introduced through 1 corneal tunnel and placed around any accessible part of the haptic with the help of a bent 26 gauge needle. This modified technique is an easy and effective way to reposition the IOL.
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Affiliation(s)
- H J Koh
- Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, South Korea.
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27
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Abstract
Autosomal dominantly transmitted hereditary multiple exostoses is an uncommon disorder consisting of multiple projections of bone capped by cartilage. The lesions are most numerous in the metaphyses of long bones but may appear on flat bones. Sarcomatous transformation occurs in 1-25% of patients. We report a 33-year-old man with sciatica, previously diagnosed as hereditary multiple exostoses, presenting with multiple peripheral nerve compressions. Electrodiagnostic studies showed profound axon-loss multiple neuropathies involving the sciatic, superior gluteal, and inferior gluteal nerves. Magnetic resonance imaging of the left pelvis showed a large mass in the sacral area that was suggestive of a chondrosarcoma. An open intralesional excision biopsy confirmed chondrosarcoma transformed from chondromatosis. Excision of the lesion was effective in eliminating the impingement of nerves and retarding progressive osseous growth. We suggest that malignant transformation be suspected in cases with focal compression neuropathy of patients known to have multiple exostoses. Osteochondroma as a possible cause for compression neuropathy is discussed.
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Affiliation(s)
- N J Paik
- Department of Rehabilitation Medicine, Seoul National University College of Medicine, Republic of Korea.
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28
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Seong GJ, Lee YG, Lee JH, Lim SJ, Lee SC, Hong YJ, Kwon OW, Kim HB. Effect of 0.2% brimonidine in preventing intraocular pressure elevation after Nd:YAG laser posterior capsulotomy. Ophthalmic Surg Lasers 2000; 31:308-14. [PMID: 10928668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
BACKGROUND AND OBJECTIVE To determine the prophylactic effect of 0.2% brimonidine in reducing the elevated intraocular pressure (IOP) in patients undergoing Nd:YAG laser posterior capsulotomy. PATIENTS AND METHODS The 81 patients (81 eyes), who underwent Nd:YAG laser posterior capsulotomy, were allocated to two treatment groups. One drop of 0.2% brimonidine or vehicle was instilled 1 hour preoperatively and one drop immediately after capsulotomy. IOPs were measured preoperatively and 1, 2, 3, and 24 hours postoperatively. RESULTS Intraocular pressure decreased from the baseline in the brimonidine group by the third postoperative hour (P<0.05), while the vehicle group exhibited an increase. Intraocular pressure elevations of 5 mm Hg or greater occurred in 7.3% (3/41) in the brimonidine group compared to 20.0% (8/40) in the vehicle group. IOP elevations of 10 mm Hg or greater occurred in 2.4% (1/41) in the brimonidine group compared to 7.5% (3/40) in the vehicle group. CONCLUSIONS One drop of 0.2% brimonidine instilled 1 hour preoperatively and immediately after capsulotomy was found to be efficacious and safe in preventing IOP elevations that frequently follow Nd:YAG laser posterior capsulotomy.
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Affiliation(s)
- G J Seong
- Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
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29
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Abstract
PURPOSE Nocardia are gram-positive bacteria existing ubiquitously in the environment; they can cause keratitis. Nocardia asteroides keratitis occurred in the interface between the stromal bed and flap after traumatic detachment of the flap 4 months after an initially uncomplicated laser in situ keratomileusis (LASIK) procedure. METHODS Nocardia asteroides keratitis was confirmed by culture. Therapy included topical and oral trimethoprim-sulfamethoxazole. RESULTS Thirteen months after the trauma, the patient's spectacle-corrected visual acuity was 20/20 with a manifest refraction of -2.25 -1.00 x 30 degrees. CONCLUSIONS The immediate steps of management consisting of surgically lifting the corneal flap, rapid microbial identification, and proper treatment with specific antibiotics resulted in the successful treatment of Nocardia asteroides keratitis in a traumatized eye after LASIK.
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Affiliation(s)
- E K Kim
- Institute of Vision Research and Department of Ophthalmology, Brain Korea 21, Yonsei University College of Medicine, Seoul
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30
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You YS, Lim SJ, Chung HS, Lee YG, Kim CY, Hong YJ. The effective concentration and exposure time of mitomycin-C for the inhibition of lens epithelial cell proliferation in rabbit eyes. Yonsei Med J 2000; 41:185-9. [PMID: 10817017 DOI: 10.3349/ymj.2000.41.2.185] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [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
The proliferation of residual lens epithelial cells following cataract surgery is assumed to be a major cause of posterior capsular opacification. To assess the efficacy of mitomycin-C in preventing posterior capsular opacification, we determined the effective concentration and exposure time of mitomycin-C in inhibiting rabbit lens epithelial cell proliferation. The fourth-passaged rabbit lens epithelial cells were maintained for one day and then exposed to mitomycin-C for 1, 2, 3, and 5 minutes, respectively. There were 9 different plating concentrations of mitomycin-C with two-fold serial dilution. The maintenance of the phenotypic properties of lens epithelial cells was confirmed by continuous transcription of lambda-crystalline mRNA determined by reverse transcription-polymerase chain reaction and the polymorphism of the restriction fragment. Cell proliferation was assayed with 3H-thymidine incorporation into DNA. The fourth-passaged cells maintained the expression of lambda-crystalline mRNA, suggesting that they are phenotypically authentic lens epithelial cells. The effective concentrations and exposure time of mitomycin-C were 0.1 mg/ml for 1 minute and 2 minutes, and 0.025 mg/ml for 2 minutes. By these results, we postulated that mitomycin-C at relatively short incubation times could be clinically used for prevention of posterior capsular opacification after cataract surgery.
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Affiliation(s)
- Y S You
- Institute of Vision Research, Yonsei University College of Medicine, Seoul, Korea
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31
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Abstract
Using a white rabbit model, the effect of the haptic portion of the intraocular lens (IOL) and intracapsular ring on the development of posterior capsular opacification (PCO) after extracapsular cataract extraction (ECCE) with phacoemulsification was studied. Implantation of both the intracapsular ring and IOL developed less PCO than implantation of the IOL alone. ECCE followed by implantation of the intracapsular ring alone also developed less PCO than ECCE alone. Through this experimental work in a rabbit model, it could be conceived that the haptic portion of IOL and the intracapsular ring can prevent the development of PCO.
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Affiliation(s)
- Y D Yoon
- Department of Ophthalmology, Hallym University Sacred Heart Hospital, Anyang, Korea.
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Park HS, Lim SJ, Chang YK, Livingston AG, Kim HS. Degradation of chloronitrobenzenes by a coculture of Pseudomonas putida and a Rhodococcus sp. Appl Environ Microbiol 1999; 65:1083-91. [PMID: 10049867 PMCID: PMC91148 DOI: 10.1128/aem.65.3.1083-1091.1999] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A single microorganism able to mineralize chloronitrobenzenes (CNBs) has not been reported, and degradation of CNBs by coculture of two microbial strains was attempted. Pseudomonas putida HS12 was first isolated by analogue enrichment culture using nitrobenzene (NB) as the substrate, and this strain was observed to possess a partial reductive pathway for the degradation of NB. From high-performance liquid chromatography-mass spectrometry and 1H nuclear magnetic resonance analyses, NB-grown cells of P. putida HS12 were found to convert 3- and 4-CNBs to the corresponding 5- and 4-chloro-2-hydroxyacetanilides, respectively, by partial reduction and subsequent acetylation. For the degradation of CNBs, Rhodococcus sp. strain HS51, which degrades 4- and 5-chloro-2-hydroxyacetanilides, was isolated and combined with P. putida HS12 to give a coculture. This coculture was confirmed to mineralize 3- and 4-CNBs in the presence of an additional carbon source. A degradation pathway for 3- and 4-CNBs by the two isolated strains was also proposed.
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Affiliation(s)
- H S Park
- Department of Chemical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea
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33
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Lim SJ, Shim HJ, Kwak BG, Kim HJ, Park HJ, Sa EJ, Min CH, Lee YC, Kim KS. Recanalization of obstructed Tenckhoff peritoneal dialysis catheter: wire/stylet manipulation combined with endoluminal electrocauterization. Cardiovasc Intervent Radiol 1998; 21:435-8. [PMID: 9853155 DOI: 10.1007/s002709900296] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
We report the results of fluoroscopically guided wire/stylet manipulation combined with endoluminal electrocauterization in seven patients with obstructed Tenckhoff peritoneal dialysis catheters. In preparation for clinical application, electrocauterization was performed using a stone basket to recanalize surgically removed Tenckhoff catheters obstructed with omental fat ingrowing through the side holes. All ingrowing omental fat was removed easily by electrocauterization with the rotating movement of a stone basket. The technique was then applied in vivo in seven cases with ingrowing omental fat and malpositioned catheter; six (86%) were successfully recanalized. Among those six cases with initial success, four maintained good catheter function with durable patency (mean 261.3 days). No significant complication was noted.
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Affiliation(s)
- S J Lim
- Department of Radiology, College of Medicine, Chung-Ang University, Seoul, Korea
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34
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Abstract
PURPOSE To determine the ideal size of an intraocular lens (IOL) for proper capsular bag fixation in different sizes of evacuated capsular bags. SETTING Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea, and Storm Eye Institute Medical University of South Carolina, Charleston, South Carolina, USA. METHODS Fifteen eyes obtained post-mortem were divided by crystalline lens size into three groups. Intraocular lenses of five different sizes were implanted in each capsular bag. The arc of contact between the haptics and capsular equator and the capsular bag distortion with each IOL were measured and compared using posterior-view analysis. RESULTS The arc of contact was directly proportional to the IOL size and inversely related to the lens size. The smallest arc of contact was 2.0 mm with the smallest IOL implanted in the largest lens group. The maximum capsular bag distortion was 2.6 mm in the case of the largest IOL implantation in the smallest lens group. CONCLUSION Implanting an IOL smaller than 12.5 mm in a large capsular bag can result in unstable fixation, while implanting an IOL larger than 12.5 mm in a small capsular bag can result in excessive stretching and distortion of the capsular bag and surrounding zonules.
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Affiliation(s)
- S J Lim
- Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
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35
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Lim SJ, Kang SJ, Kim HB, Kurata Y, Sakabe I, Apple DJ. Analysis of zonular-free zone and lens size in relation to axial length of eye with age. J Cataract Refract Surg 1998; 24:390-6. [PMID: 9559477 DOI: 10.1016/s0886-3350(98)80329-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [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: 02/07/2023]
Abstract
PURPOSE To evaluate the anatomical relationships of the zonular-free zone (ZFZ) of the anterior capsule and crystalline lens diameter in relation to the axial length of the eye with age. SETTING Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea, and Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. METHOD Various ocular structures in 122 eyes obtained post-mortem were measured without prior preparation. The correlation between age, anterior-posterior (A-P) length and globe size, and diameters of the cornea, crystalline lens, and ZFZ were analyzed. RESULTS The average A-P globe length, and corneal, lens, and ZFZ diameters were 24.48, 11.67, 9.65, and 6.93 mm, respectively. There was no significant relationship between A-P length and globe size and corneal diameter in different age groups. The ZFZ size varied negligibly among age groups. There was a statistically significant correlation between lens diameter and age (correlation coefficient = 0.2647; P < .01) and lens diameter and A-P globe length (correlation coefficient = 0.3183; P < .001). CONCLUSIONS When choosing an intraocular lens, one should consider the patient's age and the A-P globe length. Six eyes (5%) showed unusual anterior insertion of zonular attachment, which reminds us to be prudent with a large paracentral capsulorhexis.
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Affiliation(s)
- S J Lim
- Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea
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36
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Abstract
OBJECTIVE This study aimed to investigate the age-related changes in the position of zonular insertion onto the anterior lens capsule. DESIGN The study design was an experimental cadaveric eye study. PARTICIPANTS Two hundred twenty-three cadaveric eyes (range, 16-100 years old) from eye banks in the United States were studied. INTERVENTION The zonular insertion onto the anterior capsule was detected using a modified posterior photographic technique. MAIN OUTCOME MEASURES The distances from the anterior zonular insertion (AZI) to the lens equator and to the ciliary sulcus, size of zonular-free zone, lens diameter, ciliary sulcus diameter, and axial length of the globe were measured. RESULTS Multiple regression analysis showed that age, lens diameter, and axial length of the globe had significant correlations with AZI (r2 = 0.748), among which age showed the highest relevance with AZI. Multiple regression equation was expressed as AZI = (0.0079 x age) + (0.202 x lens diameter) - (0.041 x axial length of the globe) + 0.0114. The increase in AZI was accompanied by a decrease in the size of zonular-free zone with age (r = -0.206, P < 0.001). CONCLUSION Aging correlates with an increase in the distance from the anterior zonular insertion to the lens equator and a decrease in zonular-free zone.
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Affiliation(s)
- I Sakabe
- Department of Ophthalmology, Jikei University School of Medicine, Tokyo, Japan
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37
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Abstract
A new homogeneous liposome immunoassay system was developed in which analyte-phospholipase C conjugates are used instead of complement or melittin. This system was applied for the determination of insulin. Liposomes incorporated with calcein as a marker were prepared by the reverse-phase evaporation method. The lysis of liposomes was determined by measuring the fluorescence intensity of calcein released from liposomes and it was increased with increasing concentration of phospholipase C. Insulin was conjugated to phospholipase C by a three-step procedure with hetero-bifunctional crosslinking reagents, succinimidyl 4-(N-maleimidomethyl)cyclohexane-1-carboxylate and 3-(2-pyridyldithio)propionic acid N-hydroxysuccinimide ester. The lytic activity of phospholipase C was not affected by the reaction for conjugation. Both p-nitrophenylphosphatidylcholine hydrolytic activity and liposome lytic activity of insulin-phospholipase C conjugate were inhibited in the presence of insulin antiserum. However, lower concentration of conjugate and shorter incubation time were required when liposomes were used in the inhibition study. The antibody inhibition of conjugate-induced lysis could be reversed by addition of a competing amount of free insulin. The standard calibration curve was obtained in the range between 4 and 130 microIU/ml (r = 0.994). The detection limit (8 microIU/ml) was comparable with those of conventional heterogeneous enzyme immunoassays. This new assay approach offers a simple, sensitive, and inexpensive testing procedure for determining ultratrace amounts of bioactive substances.
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Affiliation(s)
- S J Lim
- College of Pharmacy, Seoul National University, Korea
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38
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Affiliation(s)
- S M Schleicher
- Department of Dermatology, Roxborough Memorial Hospital, Philadelphia, Pennsylvania 19128, USA
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39
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Sakabe I, Lim SJ, Apple DJ. [Anatomical evaluation of the anterior capsular zonular free zone in the human crystalline lens (age range, 50 approximately 100 years)]. Nippon Ganka Gakkai Zasshi 1995; 99:1119-22. [PMID: 8533632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
It is important to determine the anterior capsular zonular free zone (ZFZ) in order to minimize the risk of zonular disinsertion. From this point of view the size of the ZFZ of normal suspended lenses was directly measured in 199 human eyes obtained postmortem. The cornea was completely excised and the iris removed to allow clear visualization of the anterior surface of the lens to the equator. After measuring lens diameter with a caliper, a 4 mm continuous curvilinear capsulorhexis was performed, and lens substrate was completely removed by phacoemulsification. Care was taken to minimize trauma to the zonules during surgery. The anterior insertion of the zonules was identified at high power magnification; the size of the ZFZ was measured with a caliper. The mean age was 75.5 +/- 10.3 (+/-SD) years (age range, 50 approximately 100 years). The mean diameter of the lenses was 9.72 +/- 0.31 mm. The mean diameter of the ZFZ was 6.83 +/- 0.35 mm. Statistical analysis revealed no significant correlation between the size of the ZFZ and age, or between the size of the ZFZ and lens diameter. The present study indicates that the size of the ZFZ was constant regardless of age or lens diameter.
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Affiliation(s)
- I Sakabe
- Department of Ophthalmology, Jikei University School of Medicine, Tokyo, Japan
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Kim CH, Lim SJ, Gollapudi S, Gupta S. Role of protein kinase C isozymes in activation of human immunodeficiency virus type 1 in chronically infected promonocytic cells: evidence against a role of PKC beta 1. Biochem Biophys Res Commun 1994; 199:292-7. [PMID: 8123026 DOI: 10.1006/bbrc.1994.1227] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Protein kinase C (PKC) plays an important role in activation of human immunodeficiency virus type 1 (HIV-1). Because of a molecular and biochemical heterogeneity of PKC, we have studied the effects of PKC isozymes in HIV-1 activation in a latently infected promonocytic cell line, U1, using various PKC isozyme agonists. 12-Deoxyphorbol 13-phenylacetate (dPP), an agonist of both Ca(++)-dependent and Ca(++)-independent isozymes, and thymeleatoxin (TT), an agonist of Ca(++)-dependent PKC isozymes, induced HIV-1 production at 10 nM with increase in a concentration dependent manner, whereas 12-deoxyphorbol 13-phenylacetate 20-acetate (dPPA), an PKC beta I isozyme agonist, did not induce viral production at 100 nM. We verified that dPPA induced translocation of PKC beta isozyme with the isozyme-specific monoclonal antibody using flow cytometry. This study demonstrates that activation of PKC isozymes leads to an induction of latent HIV-1 in U1 cells whereas PKC beta I isozyme may not be important.
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Affiliation(s)
- C H Kim
- Division of Basic and Clinical Immunology, University of California, Irvine 92717
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41
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Abstract
Immunoliposomes were prepared and their immunoassay applications investigated. Liposomes were prepared from cholesterol and phospholipids including maleimidobenzoylphosphatidylethanolamine (MBPE) for conjunction with thiol-containing antigens. Alkaline phosphatase (APase) was entrapped in the liposome and BSA, the antigen, was modified by reaction with 3-(2-pyridyl-dithio)propionyl N-hydroxysuccinimide ester (SPDP) to introduce thiol groups for efficient coupling. BSA-coupled liposomes (immunoliposomes) were incubated with anti-BSA serum, complement, and then with APase substrate. The amount of coupled BSA was affected by the reaction time, the composition of the liposome and the BSA concentration in the reactant. The amount of enzyme released from immunoliposomes as a final result of the immunoreaction increased with increasing concentrations of complement and antibody. The liposome immunoassay offers a relatively rapid and simple testing procedure to quantitatively or qualitatively determine the presence or absence of antibodies, or antigenic materials for diagnostic purposes.
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Affiliation(s)
- C K Kim
- College of Pharmacy, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-742, South Korea
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Schleicher SM, Milstein HJ, Lim SJ. Stump the experts. Eccrine acrospiroma. J Dermatol Surg Oncol 1989; 15:1250, 1297. [PMID: 2556463 DOI: 10.1111/j.1524-4725.1989.tb03140.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- S M Schleicher
- Department of Dermatology, Philadelphia College of Osteopathic Medicine, Pennsylvania
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44
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Lim SJ, Schleicher SM, Milstein HJ. Granuloma pyogenicum (pregnancy tumor). J Dermatol Surg Oncol 1989; 15:369, 472. [PMID: 2925981 DOI: 10.1111/j.1524-4725.1989.tb03240.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- S J Lim
- Dermatology Center, Philadelphia, Pennsylvania
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45
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Lim SJ, Goh KT, Chua EC. Water resource development and prevention of malaria. Ann Acad Med Singap 1987; 16:702-6. [PMID: 3328558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The construction of dams across the mouths of major tidal rivers in the development of the Kranji Reservoir, Western Catchments Scheme and the Sungei Seletar Reservoir in Singapore created suitable environmental conditions for the propagation of anopheline brackish-water breeders. The employment of foreign contract workers from malarious areas for the projects further increased the potential risk of malaria transmission. However, constant vigilance and environmental management aimed at the permanent elimination of vector breeding habitats, supplemented with chemical control and anti-parasite measures successfully prevented the reintroduction of malaria in these highly receptive and vulnerable areas.
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Affiliation(s)
- S J Lim
- Vector Control and Research Department, Ministry of the Environment, Singapore
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46
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Lim SJ. [Case study of adjustment disorder patient using nursing diagnosis]. Taehan Kanho 1987; 26:63-4, 62. [PMID: 3657055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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47
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Goh KT, Ng SK, Chan YC, Lim SJ, Chua EC. Epidemiological aspects of an outbreak of dengue fever/dengue haemorrhagic fever in Singapore. Southeast Asian J Trop Med Public Health 1987; 18:295-302. [PMID: 3433161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A nation-wide outbreak of 260 cases of DF/DHF with 1 death occurred in Singapore from Apr-Sept 1986. The outbreak originated from 3 separate foci of transmission at the western, south-eastern and north-eastern parts of the island and then spread to other dengue receptive urban and suburban areas. The morbidity rate was highest in young male Chinese adults between 15 and 24 years of age. The outbreak was rapidly brought under control through destruction of adult Aedes mosquitoes, surveys and source reduction of larval breeding habitats, health education and to a certain extent law enforcement. The Aedes population was high in the main foci of transmission although the overall house index was only 1.1. Other factors which could have precipitated the outbreak included waning herd immunity of the human population and continuous introduction of dengue virus into the country.
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Affiliation(s)
- K T Goh
- Quarantine & Epidemiology Department, Ministry of the Environment, Singapore
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