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Choi YH, Kim JS, Byun G. Source localization based on steered frequency-wavenumber analysis for sparse array. J Acoust Soc Am 2023; 153:3065. [PMID: 37222575 DOI: 10.1121/10.0019552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 05/06/2023] [Indexed: 05/25/2023]
Abstract
When using a sparse array, locating the target signal of a high-frequency component is difficult. Although forecasting the direction in a sparse situation is challenging, the frequency-wavenumber (f-k) spectrum can simultaneously determine the direction and frequency of the analyzed signal. The striation of the f-k spectrum shifts along the wavenumber axis in a sparse situation, which reduces the spatial resolution required to determine the target's direction using the f-k spectrum. In this study, f-k spectra of a high-frequency signal were used for near-field source localization. Snapping shrimp sounds (5-24 kHz) from SAVEX15 (a shallow-water acoustic variability experiment conducted in May 2015) were used as the data source, and a simulation was used to evaluate the proposed method. Beam steering was performed before creating the f-k spectrum to improve spatial resolution. We found that the spatial resolution was improved, and the location of the sound source could be determined when a signal with beam steering was utilized. The shrimp sound from SAVEX15, a near-field broadband signal, was used to determine the shrimp's location (range, 38 m; depth, 100 m) and the tilt of the vertical line array. These results suggest that the proposed analysis helps to accurately estimate the location of sound source.
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Affiliation(s)
- Y H Choi
- Department of Ocean Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - J S Kim
- Department of Ocean Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
| | - Gihoon Byun
- Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University, Busan 49112, Republic of Korea
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2
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Verpoorte R, Kim HK, Choi YH. Trivialities in metabolomics: Artifacts in extraction and analysis. Front Mol Biosci 2022; 9:972190. [PMID: 36158577 PMCID: PMC9493124 DOI: 10.3389/fmolb.2022.972190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 08/11/2022] [Indexed: 11/13/2022] Open
Abstract
The aim of this review is to show the risks of artifact formation in metabolomics analyses. Metabolomics has developed in a major tool in system biology approaches to unravel the metabolic networks that are the basis of life. Presently TLC, LC-MS, GC-MS, MS-MS and nuclear magnetic resonance are applied to analyze the metabolome of all kind of biomaterials. These analytical methods require robust preanalytical protocols to extract the small molecules from the biomatrix. The quality of the metabolomics analyses depends on protocols for collecting and processing of the biomaterial, including the methods for drying, grinding and extraction. Also the final preparation of the samples for instrumental analysis is crucial for highly reproducible analyses. The risks of artifact formation in these steps are reviewed from the point of view of the commonly used solvents. Examples of various artifacts formed through chemical reactions between solvents or contaminations with functional groups in the analytes are discussed. These reactions involve, for example, the formation of esters, trans-esterifications, hemiacetal and acetal formation, N-oxidations, and the formation of carbinolamines. It concerns chemical reactions with hydroxyl-, aldehyde-, keto-, carboxyl-, ester-, and amine functional groups. In the analytical steps, artifacts in LC may come from the stationary phase or reactions of the eluent with analytes. Differences between the solvent of the injected sample and the LC-mobile phase may cause distortions of the retention of analytes. In all analytical methods, poorly soluble compounds will be in all samples at saturation level, thus hiding a potential marker function. Finally a full identification of compounds remains a major hurdle in metabolomics, it requires a full set of spectral data, including methods for confirming the absolute stereochemistry. The putative identifications found in supplemental data of many studies, unfortunately, often become “truly” identified compounds in papers citing these results. Proper validation of the protocols for preanalytical and analytical procedures is essential for reproducible analyses in metabolomics.
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Affiliation(s)
- R. Verpoorte
- Natural Products Laboratory, Institute of Biology Leiden, Leiden University, Leiden, The, Netherlands
- *Correspondence: R. Verpoorte,
| | - H. K. Kim
- Natural Products Laboratory, Institute of Biology Leiden, Leiden University, Leiden, The, Netherlands
| | - Y. H. Choi
- Natural Products Laboratory, Institute of Biology Leiden, Leiden University, Leiden, The, Netherlands
- College of Pharmacy, Kyung Hee Univeristy, Seoul, South Korea
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3
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Goszczynski DE, Tinetti PS, Choi YH, Hinrichs K, Ross PJ. Genome activation in equine in vitro-produced embryos. Biol Reprod 2021; 106:66-82. [PMID: 34515744 DOI: 10.1093/biolre/ioab173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 08/17/2021] [Accepted: 09/07/2021] [Indexed: 11/13/2022] Open
Abstract
Embryonic genome activation is a critical event in embryo development, in which the transcriptional program of the embryo is initiated. The timing and regulation of this process are species-specific. In vitro embryo production is becoming an important clinical and research tool in the horse; however, very little is known about genome activation in this species. The objective of this work was to identify the timing of genome activation, and the transcriptional networks involved, in in vitro-produced horse embryos. RNA-Seq was performed on oocytes and embryos at eight stages of development (MII, zygote, 2-cell, 4-cell, 8-cell, 16-cell, morula, blastocyst; n = 6 per stage, 2 from each of 3 mares). Transcription of seven genes was initiated at the 2-cell stage. The first substantial increase in gene expression occurred at the 4-cell stage (minor activation), followed by massive gene upregulation and downregulation at the 8-cell stage (major activation). An increase in intronic nucleotides, indicative of transcription initiation, was also observed at the 4-cell stage. Co-expression network analyses identified groups of genes that appeared to be regulated by common mechanisms. Investigation of hub genes and binding motifs enriched in the promoters of co-expressed genes implicated several transcription factors. This work represents, to the best of our knowledge, the first genomic evaluation of embryonic genome activation in horse embryos.
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Affiliation(s)
- D E Goszczynski
- Department of Animal Science, University of California, Davis, CA, USA
| | - P S Tinetti
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
| | - Y H Choi
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
| | - K Hinrichs
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
| | - P J Ross
- Department of Animal Science, University of California, Davis, CA, USA
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4
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Goszczynski DE, Tinetti PS, Choi YH, Ross PJ, Hinrichs K. Allele-specific expression analysis reveals conserved and unique features of preimplantation development in equine ICSI embryos. Biol Reprod 2021; 105:1416-1426. [PMID: 34515759 DOI: 10.1093/biolre/ioab174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 08/17/2021] [Accepted: 09/10/2021] [Indexed: 12/30/2022] Open
Abstract
Embryonic genome activation and dosage compensation are major genetic events in early development. Combined analysis of single embryo RNA-seq data and parental genome sequencing was used to evaluate parental contributions to early development and investigate X-chromosome dynamics. In addition, we evaluated dimorphism in gene expression between male and female embryos. Evaluation of parent-specific gene expression revealed a minor increase in paternal expression at the 4-cell stage that increased at the 8-cell stage. We also detected eight genes with allelic expression bias that may have an important role in early development, notably NANOGNB. The main actor in X-chromosome inactivation, XIST, was significantly upregulated at the 8-cell, morula, and blastocyst stages in female embryos, with high expression at the latter. Sexual dimorphism in gene expression was identified at all stages, with strong representation of the X-chromosome in females from the 16-cell to the blastocyst stage. Female embryos showed biparental X-chromosome expression at all stages after the 4-cell stage, demonstrating the absence of imprinted X-inactivation at the embryo level. The analysis of gene dosage showed incomplete dosage compensation (0.5 < X:A < 1) in MII oocytes and embryos up to the 4-cell stage, an increase of the X:A ratio at the 16-cell and morula stages after genome activation, and a decrease of the X:A ratio at the blastocyst stage, which might be associated with the beginning of X-chromosome inactivation. This study represents the first critical analysis of parent- and sex-specific gene expression in early equine embryos produced in vitro.
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Affiliation(s)
- D E Goszczynski
- Department of Animal Science, University of California, Davis, CA, USA
| | - P S Tinetti
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
| | - Y H Choi
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
| | - P J Ross
- Department of Animal Science, University of California, Davis, CA, USA
| | - K Hinrichs
- Department of Veterinary Physiology and Pharmacology, Texas A&M University, College Station, TX, USA
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Roh YH, Yoo SJ, Choi YH, Yang HC, Nam KW. Effects of Inflammatory Disease on Clinical Progression and Treatment of Ischiogluteal Bursitis: A Retrospective Observational Study. Malays Orthop J 2021; 14:32-41. [PMID: 33403060 PMCID: PMC7752025 DOI: 10.5704/moj.2011.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Introduction: The symptoms of Ischiogluteal Bursitis (IGB) are often nonspecific and atypical, and its diagnosis is more challenging. Moreover, it is difficult to predict cases of chronic progression or poor treatment response. Therefore, the aim of this study was to investigate the clinical course of IGB patients and identify factors that are predictive of failure of conservative treatment. Materials and Methods: Our study consisted of IGB patients diagnosed between 2010 March and 2016 December who had been followed-up for at least one year. Structured questionnaires and medical records were reviewed to analyse demographic characteristics, lifestyle patterns, blood tests, and imaging studies. We categorized the cases into two groups based on the response to conservative treatment and the need for surgical intervention. Results: The most common initial chief symptoms were buttock pains in 24 patients (37.5%). Physical examinations showed the tenderness of ischial tuberosity area in 59 (92.2%) patients, but no specific findings were confirmed in 5 patients (7.8%). 51 patients (79.7%) responded well to the conservative management, 11 patients (17.2%) needed injection, and 2 patients (3.1%) had surgical treatment performed due to continuous recurrence. There was no difference in demographic and blood lab data between the two groups. However, the incidence of inflammatory diseases (response group: 10.3% vs non-response group: 66.7%, p=0.004) was significantly different between the two groups. Conclusion: The diagnosis of IGB can be missed due to variations in clinical symptoms, and cautions should be exercised in patients with inflammatory diseases as conservative treatment is less effective in them, leading to chronic progression of IGB.
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Affiliation(s)
- Y H Roh
- Department of Orthopaedics, Jeju National University Hospital, Jeju City, Republic of Korea
| | - S J Yoo
- Department of Orthopaedics, Jeju National University Hospital, Jeju City, Republic of Korea
| | - Y H Choi
- Department of Orthopaedics, Jeju National University Hospital, Jeju City, Republic of Korea
| | - H C Yang
- Department of Orthopaedics, Jeju National University Hospital, Jeju City, Republic of Korea
| | - K W Nam
- Department of Orthopaedics, Jeju National University Hospital, Jeju City, Republic of Korea
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Pecha S, Ziegelhoeffer T, Yildirim Y, Choi YH, Willems S, Reichenspurner H, Burger H, Hakmi S. Safety and Efficacy of Transvenous Lead Extraction of Very Old Leads. Thorac Cardiovasc Surg 2021. [DOI: 10.1055/s-0041-1725710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Goszczynski DE, Tinetti P, Choi YH, Hinrichs K, Ross PJ. 59 Genome activation in intracytoplasmic sperm injection-derived horse embryos. Reprod Fertil Dev 2020. [DOI: 10.1071/rdv32n2ab59] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
During pre-implantation development, embryos go through a critical period of embryonic genome activation (EGA). The timing of EGA is species specific, but little is known in horse embryos. Here, we aimed to characterise EGA in equine embryos produced by intracytoplasmic sperm injection. Embryos were produced by intracytoplasmic sperm injection of oocytes from 3 mares. Two embryos from each mare at each of 8 developmental stages (MII, zygote, 2-cell, 4-cell, 8-cell, 16-cell, morula, and blastocyst) were individually analysed by RNA-seq. Differential expression was evaluated using binomial Wald tests with an absolute logFC (fold change) threshold of 1 in the DESEqn 2R package. We found that EGA occurred in a two-step fashion. Minor EGA took place during the 2-cell to 4-cell transition, and featured up-regulation of 751 genes and discrete down-regulation of 60 genes in 4-cell embryos compared with 2-cell embryos. Differentially upregulated genes were enriched in gene ontology terms related to transcriptional activator activity, homeobox domains, and nucleosome assembly. Major EGA occurred during the 4-cell to 8-cell transition and included the largest number of differentially expressed genes (n=2,023) between consecutive stages. This period also featured the first massive transcript downregulation (n=816). Upregulated genes were enriched in gene ontology terms related to ribosomal assembly, translation, and RNA modification. Additionally, we observed that the number of intronic sequences was significantly higher from the 4-cell stage onward, indicating active transcription in comparison to oocytes, zygotes, and 2-cell embryos. To evaluate the timing of paternal genome activation, we used whole-genome sequencing data from the parents (average genome coverage of 19×) to quantify allele-specific expression. The average number of informative SNPs in exons, i.e. SNPs with alternative homozygous genotypes from the sire (AA mare - BB sire), was 26 128 per mare, corresponding to 7696 genes. Parental-specific transcript abundance was determined for each embryo, with an average of 1,911±865 informative SNPs detected per sample. Paternal alleles were considered expressed when they reached 10% of the maternal count. Across development, paternal transcripts became appreciable at the 4-cell stage, with 14.15±7.60% of the informative SNPs exhibiting paternal expression, and increased thereafter until reaching a maximum of 96.34% at the blastocyst stage. Overall, this work demonstrates that EGA in horse embryos starts at the 4-cell stage and achieves its main activation at the 8-cell stage. Further analysis will be performed to detail paternal vs. maternal gene expression at the different embryonic stages.
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Choi YH, Li Y, Park D, Lee J, Michael PC, Bascuñàn J, Voccio JP, Iwasa Y, Tanaka H. A Tabletop Persistent-Mode, Liquid Helium-Free 1.5-T MgB2 "Finger" MRI Magnet: Construction and Operation of a Prototype Magnet. IEEE Trans Appl Supercond 2019; 29:4400405. [PMID: 31156321 PMCID: PMC6538265 DOI: 10.1109/tasc.2019.2900057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
This paper presents results of construction and operation of a persistent-mode, liquid-helium-free, small-scale prototype magnet for the development of a tabletop 1.5-T "finger" MRI system for osteoporosis screening. The prototype magnet, composed of 2 MgB2 coils, one superconducting joint, and a persistent-current switch (PCS) built from a portion of one coil, was wound with a one continuous ~80-m long unreacted and monofilament MgB2 wire and then reacted. The test magnet was charged successfully and generated the estimated target field of 1.75 T at 5 K with the proposed PCS operation. During initial persistent-mode, the field was slightly decayed due to the index dissipation of the joint; thereafter it sustained the persistent field of 1.7 T for 35 h. The test results validated the joint resistance of < 1.2 × 10-11 as well as the proposed approach involving the PCS coil circuit model.
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Affiliation(s)
- Y H Choi
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - Y Li
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - D Park
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - J Lee
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - P C Michael
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - J Bascuñàn
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - J P Voccio
- Department of Mechanical Engineering, Wentworth Institute of Technology, Boston, MA 02115
| | - Y Iwasa
- Francis Bitter Magnet Laboratory/Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA
| | - H Tanaka
- Research and Development Group, Center for Technology Innovation-Energy, Hitachi Ltd., Hitachi-shi 3191221, Japan
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Lee SY, Kang DY, Kim JY, Yoon SH, Choi YH, Lee W, Cho SH, Kang HR. Incidence and Risk Factors of Immediate Hypersensitivity Reactions Associated With Low-Osmolar Iodinated Contrast Media: A Longitudinal Study Based on a Real-Time Monitoring System. J Investig Allergol Clin Immunol 2019; 29:444-450. [PMID: 30676320 DOI: 10.18176/jiaci.0374] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES We investigated the incidence of immediate hypersensitivity reaction (HSR) caused by different types of low-osmolar contrast media (LOCM) and cumulative exposure to LOCM. METHODS This cohort study included all consecutive patients who underwent LOCM-enhanced computed tomography from 2012 through 2014. We assessed 5 LOCM (iobitridol, iohexol, iomeprol, iopamidol, and iopromide). All patients were monitored for adverse events, and new symptoms and signs were recorded in real time using the Contrast Safety Monitoring and Management System (CoSM2oS). RESULTS The overall incidence of immediate HSR to LOCM was 0.97% (2004 events resulting from 205 726 exposures). Incidence differed significantly depending on whether the patient had a previous history of HSR to LOCM (0.80% in patients with no history and 16.99% in patients with a positive history of HSR to LOCM, P=.001). The incidence of HSR to individual LOCM ranged from 0.72% (iohexol) to 1.34% (iomeprol), although there were no significant differences across the 5 LOCM. A longitudinal analysis demonstrated that the incidence of HSR increased gradually with more frequent previous exposure to LOCM (HR=2.006 [95%CI, 1.517-2.653], P<.001). However, this cumulative increase in risk was observed in patients who had experienced HSR to LOCM, but not in those who had not. CONCLUSION The incidence of HSR did not differ significantly across the 5 LOCM assessed in the study. Repeated exposure to LOCM did not increase the risk of HSR among patients who had never experienced HSR to LOCM.
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Affiliation(s)
- S Y Lee
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.,Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - D Y Kang
- Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea
| | - J Y Kim
- Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea
| | - S H Yoon
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
| | - Y H Choi
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
| | - W Lee
- Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea
| | - S H Cho
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.,Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.,Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea
| | - H R Kang
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.,Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.,Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea
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Choi YH, Zhang X, Tran C, Skinner B. Expression profiles of host immune response-related genes against HEV genotype 3 and genotype 1 infections in rhesus macaques. J Viral Hepat 2018; 25. [PMID: 29532615 PMCID: PMC8996335 DOI: 10.1111/jvh.12890] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Hepatitis E virus (HEV) genotype (gt) 3 infection is food-borne causing sporadic infections in older individuals and gt1 infection is waterborne, often causing epidemics affecting primarily young adults. Although HEV infection causes self-limited disease, gt3 induces chronic infection in immunocompromised individuals. Hepatic host gene expression against gt3 infection remains unknown. Host gene expression profiles for HEV gt1 (n = 3) and gt3 (n = 7) infections were analysed in the livers of experimentally infected rhesus macaques. HEV RNA was detected from 2 to 24 days after inoculation (DAI) in stool and serum, elevated alanine aminotransferase (ALT) activity was detected from 7 to 31 DAI, and anti-HEV antibody became detectable between 12 and 42 DAI. All 10 animals cleared the infection between 34 and 68 DAI. We found that 24%, 48% and 41% of hepatic immune response genes against gt3 infection were upregulated during the early, peak and decline phases of HEV RNA replication. For gt1 infection, 25% of hepatic immune response-related genes were downregulated during early viremia, but 6%, 34% and 37% of genes were upregulated at the early, peak and during decline of HEV RNA replication, respectively. Our study demonstrated distinct differences in the expression profiles of host immune response-related genes of HEV gt3 and gt1 infections in experimentally infected rhesus macaques.
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Affiliation(s)
- Y. H. Choi
- Laboratory Branch, Division of Viral Hepatitis, NCHHSTP, CDC, Atlanta, GA, USA
| | - X. Zhang
- Laboratory Branch, Division of Viral Hepatitis, NCHHSTP, CDC, Atlanta, GA, USA
| | - C. Tran
- Laboratory Branch, Division of Viral Hepatitis, NCHHSTP, CDC, Atlanta, GA, USA
| | - B. Skinner
- Comparative Medicine Branch, Division of Scientific Resources, NCEZID, CDC, Atlanta, GA, USA
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Park I, Choi JH, Kim EK, Kim SM, Yang JH, Song YB, Hahn JY, Choi SH, Gwon HC, Lee SH, Choi YH, Oh JK. P1790Non-invasive identification of coronary collateral vessels by coronary computed tomography. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- I Park
- International ST.Mary's Hospital, Department of Internal medicine, Division of Cardiology, Incheon, Korea Republic of
| | - J H Choi
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - E K Kim
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - S M Kim
- Samsung Medical Center, Department of Radiology, Seoul, Korea Republic of
| | - J H Yang
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - Y B Song
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - J Y Hahn
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - S H Choi
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - H C Gwon
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - S H Lee
- Samsung Medical Center, Cardiology, Seoul, Korea Republic of
| | - Y H Choi
- Samsung Medical Center, Department of Radiology, Seoul, Korea Republic of
| | - J K Oh
- Mayo Clinic, Department of Internal medicine, Rochester, United States of America
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Kim MJ, Kim SS, Park KJ, An HJ, Choi YH, Lee NH, Hyun CG. Methyl jasmonate inhibits lipopolysaccharide-induced inflammatory cytokine production via mitogen-activated protein kinase and nuclear factor-κB pathways in RAW 264.7 cells. Pharmazie 2018; 71:540-543. [PMID: 29441852 DOI: 10.1691/ph.2016.6647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 09/29/2022]
Abstract
Methyl jasmonate is an important signaling molecule involved in plant defense as well as in the regulation of plant growth and development. Despite its various functions in plants, its effects on animal cells have not been widely studied and no report has been issued on the molecular aspects of its anti-inflammatory effect. In the present study, we investigated the in vitro anti-inflammatory properties of methyl jasmonate in lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. Methyl jasmonate treatment effectively inhibited LPS-induced production of pro-inflammatory mediators (nitric oxide and prostaglandin E2) and cytokines (tumor necrosis factor-α, interleukin (IL)-1β, and IL-6) in a concentration-dependent manner. Furthermore, it attenuated the LPS-induced activation of nuclear factor-κB (NF-κB) by suppressing the degradation of the inhibitor of κB-α (IκB-α). Additionally, methyl jasmonate dose-dependently blocked the phosphorylation of mitogen-activated protein kinases (MAPKs), i.e., p38 kinase, extracellular signal-regulated kinase (ERK) 1/2, and c-Jun N-terminal kinase (JNK), in these cells. These results suggest that methyl jasmonate attenuated the LPS-induced release of pro-inflammatory mediators and cytokines by suppressing the activation of MAPK (JNK, ERK and p38) and NF-κB signaling. This study not only demonstrated that methyl jasmonate exerts anti-inflammatory activities in macrophages but also revealed its potential as a candidate for the treatment of various inflammation-associated diseases.
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Mishra A, Nam GH, Gim JA, Lee HE, Jo A, Yoon D, Oh S, Kim S, Kim A, Kim DH, Kim YC, Jeong HD, Cha HJ, Choi YH, Kim HS. Comparative evaluation of MCP gene in worldwide strains of Megalocytivirus (Iridoviridae family) for early diagnostic marker. J Fish Dis 2018; 41:105-116. [PMID: 28914452 DOI: 10.1111/jfd.12685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 06/18/2017] [Accepted: 06/19/2017] [Indexed: 06/07/2023]
Abstract
Members of the Iridoviridae family have been considered as aetiological agents of iridovirus diseases, causing fish mortalities and economic losses all over the world. Virus identification based on candidate gene sequencing is faster, more accurate and more reliable than other traditional phenotype methodologies. Iridoviridae viruses are covered by a protein shell (capsid) encoded by the important candidate gene, major capsid protein (MCP). In this study, we investigated the potential of the MCP gene for use in the diagnosis and identification of infections caused Megalocytivirus of the Iridoviridae family. We selected data of 66 Iridoviridae family isolates (53 strains of Megalocytivirus, eight strains of iridoviruses and five strains of Ranavirus) infecting various species of fish distributed all over the world. A total of 53 strains of Megalocytivirus were used for designing the complete primer sets for identifying the most hypervariable region of the MCP gene. Further, our in silico analysis of 102 sequences of related and unrelated viruses reconfirms that primer sets could identify strains more specifically and offers a useful and fast alternative for routine clinical laboratory testing. Our findings suggest that phenotype observation along with diagnosis using universal primer sets can help detect infection or carriers at an early stage.
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Affiliation(s)
- A Mishra
- Genetic Engineering Institute, Pusan National University, Busan, Korea
| | - G-H Nam
- Genetic Engineering Institute, Pusan National University, Busan, Korea
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan, Korea
| | - J-A Gim
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan, Korea
| | - H-E Lee
- Genetic Engineering Institute, Pusan National University, Busan, Korea
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan, Korea
| | - A Jo
- Genetic Engineering Institute, Pusan National University, Busan, Korea
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan, Korea
| | - D Yoon
- Department of Chemistry, College of Natural Sciences, Pusan National University, Busan, Korea
| | - S Oh
- Department of Chemistry, College of Natural Sciences, Pusan National University, Busan, Korea
| | - S Kim
- Department of Chemistry, College of Natural Sciences, Pusan National University, Busan, Korea
| | - A Kim
- Department of Aquatic Life Medicine, Pukyong National University, Busan, Korea
| | - D-H Kim
- Department of Aquatic Life Medicine, Pukyong National University, Busan, Korea
| | - Y C Kim
- Department of Aquatic Life Medicine, Pukyong National University, Busan, Korea
| | - H D Jeong
- Department of Aquatic Life Medicine, Pukyong National University, Busan, Korea
| | - H-J Cha
- Departments of Parasitology and Genetics, College of Medicine, Kosin University, Busan, Korea
| | - Y H Choi
- Department of Biochemistry, College of Korean Medicine, Dongeui University, Busan, Korea
| | - H-S Kim
- Genetic Engineering Institute, Pusan National University, Busan, Korea
- Department of Biological Sciences, College of Natural Sciences, Pusan National University, Busan, Korea
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Abstract
Glyphosate-surfactant is one of the most commonly used herbicides in the world. Its key component, glyphosate, is a competitive inhibitor of the shikimate pathway, a metabolic pathway found only in plants. However, severe intoxication, including lethal cases by ingestion of, glyphosate-surfactant has been reported. We describe the full recovery of two patients from glyphosate-polyoxyethyleneamine surfactant intoxication and multi-organ system failure following continuous renal replacement therapy. Both patients developed persistent shock, acute kidney injury, lactic acidosis, hyperkalaemia and multi-organ failure despite of resuscitation. We believe that continuous renal replacement therapy should be initiated immediately for removal of glyphosate-polyoxyethyleneamine surfactant in patients with signs of cardiopulmonary compromise, lactic acidosis, and renal failure. We propose the addition of glyphosate-polyoxyethyleneamine surfactant to the list of toxins for which early haemodialysis should be indicated.
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Affiliation(s)
- DH Lee
- Chung-ang University Medical Center, Department of Emergency Medicine, Seoul, Korea
| | - YH Choi
- Ewha Womans University, Department of Emergency Medicine, Ewha Womans University Medical Center, 911-1 Mokdong Yangcheon-gu, Seoul, Korea
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15
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Yun HW, Lee DH, Lee JH, Cheon YJ, Choi YH. Serial Serum Cholinesterase Activities as a Prognostic Factor in Organophosphate Poisoned Patients. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791201900203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Objective Organophosphate poisoning is a serious clinical entity and of considerable morbidity and mortality. Several factors have been identified to predict outcomes of organophosphate poisoning. This investigation aims to identify the relationship between the dynamics of serum cholinesterase (SChE) activity and mortality. Methods In this retrospective study, medical records of all patients with acute organophosphate poisoning were reviewed from January 2001 to December 2009. Clinical features, SChE activity, Glasgow Coma Scale, laboratory findings, electrocardiogram finding, management and their outcomes were examined. Results A total of 169 patients were included in this study. A total of 55 patients were enrolled. Deceased patients were 8 in number. Absence of an increase in SChE activity was related with mortality in organophosphate poisoned patients (p value=0.036; odds ratio, 5.445; 95% confidence interval, 1.121-26.551). Conclusions The absence of an increase in SChE activity is associated with higher mortality in organophosphate poisoning. The SChE dynamic activity can provide a guide to physicians in the evaluation and management of organophosphate poisoned patients.
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Affiliation(s)
| | - DH Lee
- Eulji University, Department of Emergency Medicine, Seoul, South Korea
| | - JH Lee
- Eulji University, Department of Emergency Medicine, Seoul, South Korea
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16
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Cheon YJ, Pyun WB, Lee DH, Choi YH. A Case of Electrocardiographic Change Caused by Subarachnoid Haemorrhage Mimicking Acute Myocardial Infarction. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791201900311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A 60-year-old woman was admitted to the emergency department due to syncope. The electrocardiogram (ECG) revealed normal sinus rhythm with ST segment elevation in leads I, II, and aVL. There was no stenosis or vasospasm in the coronary arteries. Transient electrocardiographic ST segment elevation which is indistinguishable from that associated with acute myocardial infarction has been reported in patients with subarachnoid hemorrhage (SAH). Until now no case was ever reported with the ECG finding with pattern of posterolateral myocardial infarction in SAH patients. So we describe a patient with SAH mimicking acute myocardial infarction.
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Affiliation(s)
| | - WB Pyun
- Ewha Womans University, Department of Cardiology, Seoul, Korea
| | - DH Lee
- Eulji University, Department of Emergency Medicine, Seoul, Korea
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17
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Lee DH, Choi YH. A Case of Pulmonary Pneumatocoele with Splenic Laceration Caused by Vehicular Accident. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791001700512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Traumatic pneumatocoele is an uncommon complication, resulting from air trapping in an area of lung laceration, and may appear a few hours or even immediately after injury. Young adults and children are most commonly affected. Its clinical relevance lies in its rarity, which might mislead emergency physicians to perform unnecessary surgical intervention. We report a 10-year-old boy suffering from traumatic pneumatocoele with spleen laceration caused by blunt trauma. It is important for emergency physicians to be aware of this condition and of its benign course so as to avoid unnecessary operative procedures due to incorrect diagnosis.
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Affiliation(s)
- DH Lee
- Yongsan Hospital, Department of Emergency Medicine, College of Medicine, Chung-ang University, Seoul, Korea
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18
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Affiliation(s)
- YH Choi
- Ewha Womans University, Department of Emergency Medicine, School of Medicine, Seoul, Korea
| | | | - HM Lee
- Soonchunhyang University, Department of Emergency Medicine, College of Medicine, Seoul, Korea
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19
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Lee DH, Choi YH. A 67-Year-Old Man with Epistaxis, Melena, Gross Haematuria and Haemarthrosis. HONG KONG J EMERG ME 2017. [DOI: 10.1177/102490791502200511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Superwarfarins are widely used as rodenticides. They are similar to warfarin, but they are more potent and act longer. In case of poisoning, they cause severe bleeding, usually from multiple sites. Prolonged treatment with high doses of vitamin K and/or fresh frozen plasma (FFP) transfusions may be necessary. Awareness of the problem of superwarfarin intoxication among physicians remains low and cases may go undiagnosed for days or weeks, resulting in increased morbidity and even mortality. We presented a case of delayed diagnosis of superwarfarin ingestion. The patient presented to emergency department with epistaxis, melena, and gross haematuria. He was treated with vitamin K and the International Normalised Ratio (INR) dropped from >7.0 to 1.4. The patient was discharged. However, 3 weeks later, the patient presented with haemarthrosis. Blood investigation revealed INR value >7.0 again. The patient finally received treatment with FFP and vitamin K. This case illustrates the importance to consider superwarfarin ingestion when patients presented with poisoning with coagulopathy. (Hong Kong j.emerg.med. 2015;22:324-327)
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Affiliation(s)
- DH Lee
- Chung-Ang University Department of Emergency Medicine, College of Medicine, Seoul, Korea
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20
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Kim EJ, Kwak YG, Park SH, Kim SR, Shin MJ, Yoo HM, Han SH, Kim DW, Choi YH, Yoo JH. Trends in device utilization ratios in intensive care units over 10-year period in South Korea: device utilization ratio as a new aspect of surveillance. J Hosp Infect 2017; 100:e169-e177. [PMID: 29042233 DOI: 10.1016/j.jhin.2017.10.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 10/10/2017] [Indexed: 11/30/2022]
Abstract
BACKGROUND Device-associated infection (DAI) is an important issue related to patient safety. It is important to reduce unnecessary device utilization in order to decrease DAI rates. AIM To investigate the time trend of device utilization ratios (DURs) of voluntarily participating hospitals, collected over a 10-year period through the Korean National Healthcare-associated Infections Surveillance System (KONIS). METHODS DURs from 2006 to 2015 in 190 intensive care units (ICUs) participating in KONIS were included in this study. DURs were calculated as the ratio of device-days to patient-days. The pooled incidences of DAIs and DURs were calculated for each year of participation, and the year-wise trends were analysed. FINDINGS Year-wise ventilator utilization ratio (V-DUR) increased significantly from 0.40 to 0.41 (F = 6.27, P < 0.01), urinary catheter utilization ratio (U-DUR) increased non-significantly from 0.83 to 0.84 (F = 1.66, P = 0.10), and C-line utilization ratio (CL-DUR) decreased non-significantly from 0.55 to 0.51 (F = 1.62, P = 0.11). In the subgroup analysis, 'medical ICU' (F = 2.79, P < 0.01) and 'hospital with >900 beds' (F = 3.07, P < 0.01) were associated with the significant increase in V-DUR. CONCLUSION In Korea, V-DUR showed a significant, year-wise increasing trend. The trends for U-DUR and CL-DUR showed no significant decrease. Efforts are required to ensure the reduction of DURs.
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Affiliation(s)
- E J Kim
- Department of Infectious Diseases, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Y G Kwak
- Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Republic of Korea
| | - S H Park
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - S R Kim
- Infection Control Office, Korea University Guro Hospital, Seoul, Republic of Korea
| | - M J Shin
- Infection Control Office, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - H M Yoo
- Infection Control Office, Inje University Sanggye Paik Hospital, Seoul, Republic of Korea
| | - S H Han
- Department of Nursing, Soonchunhyang University College of Medicine, Cheonan, Republic of Korea
| | - D W Kim
- Department of Policy Research Affairs, National Health Insurance Service Ilsan Hospital, Goyang, Republic of Korea
| | - Y H Choi
- Department of Infectious Diseases, Ajou University School of Medicine, Suwon, Republic of Korea.
| | - J H Yoo
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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21
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Ryu HY, Jeon KS, Kang MG, Yuh HK, Choi YH, Lee JS. A comparative study of efficiency droop and internal electric field for InGaN blue lighting-emitting diodes on silicon and sapphire substrates. Sci Rep 2017; 7:44814. [PMID: 28401941 PMCID: PMC5388842 DOI: 10.1038/srep44814] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 02/15/2017] [Indexed: 11/28/2022] Open
Abstract
We investigated the efficiency droop and polarization-induced internal electric field of InGaN blue light-emitting diodes (LEDs) grown on silicon(111) and c-plane sapphire substrates. The efficiency droop of the LED sample grown on silicon substrates was considerably lower than that of the identically fabricated LED sample grown on sapphire substrates. Consequently, the LED on silicon showed higher efficiency at a sufficiently high injection current despite the lower peak efficiency caused by the poorer crystal quality. The reduced efficiency droop for the LED on silicon was attributed to its lower internal electric field, which was confirmed by reverse-bias electro-reflectance measurements and numerical simulations. The internal electric field of the multiple quantum wells (MQWs) on silicon was found to be reduced by more than 40% compared to that of the MQWs on sapphire, which resulted in a more homogenous carrier distribution in InGaN MQWs, lower Auger recombination rates, and consequently reduced efficiency droop for the LEDs grown on the silicon substrates. Owing to its greatly reduced efficiency droop, the InGaN blue LED on silicon substrates is expected to be a good cost effective solution for future lighting technology.
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Affiliation(s)
- H. Y. Ryu
- Department of Physics, Inha University, Incheon 22212, Korea
| | - K. S. Jeon
- LG Electronics Advanced Research Institute, Seoul 06763, Korea
| | - M. G. Kang
- LG Electronics Advanced Research Institute, Seoul 06763, Korea
| | - H. K. Yuh
- LG Electronics Advanced Research Institute, Seoul 06763, Korea
| | - Y. H. Choi
- LG Electronics Advanced Research Institute, Seoul 06763, Korea
| | - J. S. Lee
- LG Electronics Advanced Research Institute, Seoul 06763, Korea
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22
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Choi YH, Tinetti P, Brom-de-Luna JG, Hinrichs K. 88 EFFECT OF BICARBONATE/CO2 LEVEL DURING EMBRYO CULTURE ON EQUINE BLASTOCYST RATE AFTER INTRACYTOPLASMIC SPERM INJECTION. Reprod Fertil Dev 2017. [DOI: 10.1071/rdv29n1ab88] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Equine embryos appear to require a high glucose concentration for development to the blastocyst stage. The complete cell-culture medium, DMEM/F-12 (DM), which contains 17 mM glucose, has been widely used for equine embryo culture; however, in other species, high glucose during the early stages of embryo development is detrimental. To avoid this, we initiated a 2-step system using a low-glucose human embryo culture medium (Global) from Days 0 to 5 [Day 0 = day of intracytoplasmic sperm injection (ICSI)], with glucose (20 mM) added to the medium in the second step (Days 5 to 10; Choi et al. 2015 Reproduction 150, 31–41). We noted a high pregnancy loss rate (20%) in our clinical ICSI program (Hinrichs et al. 2014 J. Equine Vet. Sci. 34, 176), which used this 2-step Global system. Limited data are available on pregnancy with DM-produced embryos, but in one study, the loss rate was 1/13 (7.7%; Choi et al. 2011 Reproduction 142, 529–538). It is possible that use of DM in the second step of culture would better support normal blastocyst development than does Global with added glucose. However, DM is typically used at 5% CO2, and Global at 6% CO2, so use of both media would necessitate 2 sets of incubators. In the present study, we explored the use of DM in the second step of a two-step equine embryo culture system, under different CO2 environments. Oocytes were collected from research mares via follicle aspiration and were held overnight before being matured in vitro for 30 h. All media included 10% fetal bovine serum. On Days 0 to 5 after ICSI, all embryos were cultured in Global under 6% CO2 in mixed gas (5% O2 and remainder N2) at 38.2°C. In Experiment 1, on Day 5, embryos were transferred to DM prepared according to our standard method, with 14.3 mM NaHCO3 and 5 mM NaOH, and were cultured in mixed gas at either 5% CO2 or 6% CO2. Five replicates were performed. In Experiment 2, DM was prepared by our standard method, or with 24.2 mM bicarbonate and no NaOH. When pH was measured using a pH meter after media were equilibrated overnight, this higher bicarbonate provided the same pH at 6% CO2 (pH 7.3), as was achieved with the standard DM preparation at 5% CO2. Six replicates were performed. In both experiments, blastocyst development was assessed on Days 7 to 10, and blastocyst rates were compared between treatments by Fisher’s exact test. In Experiment 1, blastocyst rates were 43%, 13/30 and 27%, 8/30 for the standard DM preparation in 5% and 6% CO2, respectively (P > 0.05). In Experiment 2, the blastocyst rates were 34%, 14/44 for the standard DM preparation at 5% CO2 and 43%, 19/44 for the high-bicarbonate DM at 6% CO2 (P > 0.05). We conclude that a 2-step Global-DM system can support equine blastocyst production under a consistent CO2 environment (6%) if DM bicarbonate levels are adjusted to balance the increased CO2.
This work was supported by the Clinical Equine ICSI Program, Texas A&M University, and by the Link Equine Research Endowment Fund, Texas A&M University.
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23
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Lee SM, Cheon JE, Choi YH, Kim IO, Kim WS, Cho HH, Lee JY, Wang KC. Limited Dorsal Myeloschisis and Congenital Dermal Sinus: Comparison of Clinical and MR Imaging Features. AJNR Am J Neuroradiol 2017; 38:176-182. [PMID: 27765739 DOI: 10.3174/ajnr.a4958] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Accepted: 08/15/2016] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE While limited dorsal myeloschisis is a distinctive form of spinal dysraphism, it may be confused with congenital dermal sinus. The aim of this study was to describe clinical and MR imaging findings of limited dorsal myeloschisis that can distinguish it from congenital dermal sinus. MATERIALS AND METHODS We retrospectively reviewed the clinical and MR imaging findings of 12 patients with limited dorsal myeloschisis and 10 patients with congenital dermal sinus. Skin abnormalities, neurologic deficits, and infectious complication were evaluated on the basis of clinical information. We evaluated the following MR imaging features: visibility of the tract along the intrathecal course, attachment site of the tract, level of the conus medullaris, shape of the spinal cord, and presence of intradural lesions such as dermoid/epidermoid tumors. RESULTS A crater covered with pale epithelium was the most common skin lesion in limited dorsal myeloschisis (10/12, 83%). Infectious complications were common in congenital dermal sinus (6/10, 60%), whereas none were found in limited dorsal myeloschisis (P = .003). The following MR imaging findings were significantly different between the 2 groups (P < .05): 1) higher visibility of the intrathecal tract in limited dorsal myeloschisis (10/12, 83%) versus in congenital dermal sinus (1/10, 10%), 2) the tract attached to the cord in limited dorsal myeloschisis (12/12, 100%) versus various tract attachments in congenital dermal sinus, 3) dorsal tenting of the cord in limited dorsal myeloschisis (10/12, 83%) versus in congenital dermal sinus (1/10, 10%), and 4) the presence of dermoid/epidermoid tumors in congenital dermal sinus (6/10, 60%) versus none in limited dorsal myeloschisis. CONCLUSIONS Limited dorsal myeloschisis has distinct MR imaging features: a visible intrathecal tract with dorsal tenting of the cord at the tract-cord union. Limited dorsal myeloschisis was not associated with infection and dermoid/epidermoid tumors.
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Affiliation(s)
- S M Lee
- From the Departments of Radiology (S.M.L., J.-E.C., Y.H.C., I.-O.K., W.S.K., H.-H.C.)
- Department of Radiology (S.M.L.), Kyungpook National University Medical Center, Daegu, Korea
| | - J-E Cheon
- From the Departments of Radiology (S.M.L., J.-E.C., Y.H.C., I.-O.K., W.S.K., H.-H.C.)
| | - Y H Choi
- From the Departments of Radiology (S.M.L., J.-E.C., Y.H.C., I.-O.K., W.S.K., H.-H.C.)
| | - I-O Kim
- From the Departments of Radiology (S.M.L., J.-E.C., Y.H.C., I.-O.K., W.S.K., H.-H.C.)
| | - W S Kim
- From the Departments of Radiology (S.M.L., J.-E.C., Y.H.C., I.-O.K., W.S.K., H.-H.C.)
| | - H-H Cho
- From the Departments of Radiology (S.M.L., J.-E.C., Y.H.C., I.-O.K., W.S.K., H.-H.C.)
- Department of Radiology (H.-H.C.), Ewha Womans University Mokdong Hospital, Seoul, Republic of Korea
| | - J Y Lee
- Anatomy (J.Y.L.)
- Neurosurgery, Division of Pediatric Neurosurgery (J.Y.L., K.-C.W.), Seoul National University College of Medicine, Seoul, Republic of Korea
| | - K-C Wang
- Neurosurgery, Division of Pediatric Neurosurgery (J.Y.L., K.-C.W.), Seoul National University College of Medicine, Seoul, Republic of Korea
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24
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Kim YG, Song JB, Choi YH, Yang DG, Kim SG, Lee HG. Investigation on quench initiation and propagation characteristics of GdBCO coil co-wound with a stainless steel tape as turn-to-turn metallic insulation. Rev Sci Instrum 2016; 87:114701. [PMID: 27910603 DOI: 10.1063/1.4966676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper investigates the quench initiation and propagation characteristics of a metallic insulation (MI) coil by conducting thermal quench tests for a GdBCO single-pancake coil co-wound with a stainless steel tape as the turn-to-turn MI. The test results confirmed that the MI coil exhibited superior thermal and electrical stabilities compared to the conventional coils co-wound with organic insulation material because the operating current could flow along the radial direction due to the existence of a turn-to-turn contact when a local hot spot was generated. The results of the quench test at a heater current (Ih) of 12, 13, and 14 A indicate that the MI coil possesses a self-protecting characteristic resulting from the "current bypass" through the turn-to-turn contact. However, the test coil was not self-protecting at Ih = 15 A because the Joule heat energy generated by the radial current flow was not completely dissipated due to the characteristic resistance of the metallic insulation tape and the non-superconducting materials, including the substrate, stabilizer, and buffer layers within the high-temperature superconductor (HTS) tape. Even though the MI coil possesses superior thermal and electrical stability relative to those of conventional HTS coils co-wound with an organic material as turn-to-turn insulation, it is essential to consider the critical role of the Joule heat energy resulting from the operating current and stored magnetic energy as well as the characteristic resistances in order to further develop self-protective 2G HTS magnets.
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Affiliation(s)
- Y G Kim
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - J B Song
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - Y H Choi
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - D G Yang
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - S G Kim
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - H G Lee
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
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25
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Choi YH, Song JB, Yang DG, Kim YG, Hahn S, Lee HG. A novel no-insulation winding technique of high temperature-superconducting racetrack coil for rotating applications: A progress report in Korea university. Rev Sci Instrum 2016; 87:104704. [PMID: 27802736 DOI: 10.1063/1.4963680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This paper presents our recent progress on core technology development for a megawatt-class superconducting wind turbine generator supported by the international collaborative R&D program of the Korea Institute of Energy Technology Evaluation and Planning. To outperform the current high-temperature-superconducting (HTS) magnet technology in the wind turbine industry, a novel no-insulation winding technique was first proposed to develop the second-generation HTS racetrack coil for rotating applications. Here, we briefly report our recent studies on no-insulation (NI) winding technique for GdBCO coated conductor racetrack coils in the following areas: (1) Charging-discharging characteristics of no-insulation GdBCO racetrack coils with respect to external pressures applied to straight sections; (2) thermal and electrical stabilities of no-insulation GdBCO racetrack coils encapsulated with various impregnating materials; (3) quench behaviors of no-insulation racetrack coils wound with GdBCO conductor possessing various lamination layers; (4) electromagnetic characteristics of no-insulation GdBCO racetrack coils under time-varying field conditions. Test results confirmed that this novel NI winding technique was highly promising. It could provide development of a compact, mechanically dense, and self-protecting GdBCO magnet for use in real-world superconducting wind turbine generators.
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Affiliation(s)
- Y H Choi
- Department of Materials Science and Engineering, Korea University, Anam-Dong 5 Ga, Seongbuk-Gu, Seoul 136-713, South Korea
| | - J B Song
- Department of Materials Science and Engineering, Korea University, Anam-Dong 5 Ga, Seongbuk-Gu, Seoul 136-713, South Korea
| | - D G Yang
- Department of Materials Science and Engineering, Korea University, Anam-Dong 5 Ga, Seongbuk-Gu, Seoul 136-713, South Korea
| | - Y G Kim
- Department of Materials Science and Engineering, Korea University, Anam-Dong 5 Ga, Seongbuk-Gu, Seoul 136-713, South Korea
| | - S Hahn
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
| | - H G Lee
- Department of Materials Science and Engineering, Korea University, Anam-Dong 5 Ga, Seongbuk-Gu, Seoul 136-713, South Korea
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Hosseindoust AR, Lee SH, Kim JS, Choi YH, Kwon IK, Chae BJ. Productive performance of weanling piglets was improved by administration of a mixture of bacteriophages, targeted to control Coliforms and Clostridium spp. shedding in a challenging environment. J Anim Physiol Anim Nutr (Berl) 2016; 101:e98-e107. [PMID: 27670132 DOI: 10.1111/jpn.12567] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2016] [Accepted: 06/09/2016] [Indexed: 01/06/2023]
Abstract
This study was conducted to investigate the effects of bacteriophages in different environments on growth performance, digestibility, ileal and caecal microbiota, gut morphology and immunity of weanling pigs. Two hundred piglets were randomly assigned to four treatment groups with five replicate pens with 10 pigs per pen. A 2 × 2 factorial arrangement of treatments was used to investigate the response of weanling pigs to supplemental bacteriophages (0 and 1.0 g/kg of diet) in contaminated or hygienic environments. Bacteriophages supplementation did not affect average daily gain (ADG), average daily feed intake (ADFI) and gain:feed in phases I and III; however, there was a significant improvement in ADG and gain:feed in phase II. The supplementation of bacteriophages increased the overall gain:feed of pigs. The overall result showed a greater ADG and ADFI in hygienic room. There were reductions in population of both ileal (p < 0.05) and caecal (p < 0.01) Clostridium spp. and ileal coliforms (p < 0.01) with the inclusion of bacteriophages in the diet. Bacteriophages increased ileal Lactobacillus and caecal Bifidobacterium and tended to increase ileal Bifidobacterium (p = 0.08). Contaminated environment decreased ileal Lactobacillus and caecal Bifidobacterium and tended to increase ileal Clostridium (p = 0.08) and coliforms (p = 0.08). Total anaerobic bacteria was tended to decrease (p = 0.06) in contaminated environment. Jejunal villus height increased in pigs received bacteriophages, but they did not affect other morphological items. The interaction between bacteriophages and environment tended to be significant (p = 0.06) for ileal villus height and ileal villus height to crypt depth ratio. The overall faecal score was significantly greater in hygienic environment and bacteriophages groups. The present findings indicate that there is an interactive effect on feed efficiency between bacteriophages and contaminated environment. In addition, bacteriophages improve jejunum morphology, and intestinal microbiota of pigs.
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Affiliation(s)
- A R Hosseindoust
- Department of Animal Resources Science, College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
| | - S H Lee
- Department of Animal Resources Science, College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
| | - J S Kim
- Southern Research and Outreach Center, University of Minnesota, Waseca, MN, USA
| | - Y H Choi
- Department of Animal Resources Science, College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
| | - I K Kwon
- Department of Animal Resources Science, College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
| | - B J Chae
- Department of Animal Resources Science, College of Animal Life Sciences, Kangwon National University, Chuncheon, Korea
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Kim CJ, Choi WS, Jung Y, Kiem S, Seol HY, Woo HJ, Choi YH, Son JS, Kim KH, Kim YS, Kim ES, Park SH, Yoon JH, Choi SM, Lee H, Oh WS, Choi SY, Kim NJ, Choi JP, Park SY, Kim J, Jeong SJ, Lee KS, Jang HC, Rhee JY, Kim BN, Bang JH, Lee JH, Park S, Kim HY, Choi JK, Wi YM, Choi HJ. Surveillance of the Middle East respiratory syndrome (MERS) coronavirus (CoV) infection in healthcare workers after contact with confirmed MERS patients: incidence and risk factors of MERS-CoV seropositivity. Clin Microbiol Infect 2016; 22:880-886. [PMID: 27475739 PMCID: PMC7128923 DOI: 10.1016/j.cmi.2016.07.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Revised: 07/11/2016] [Accepted: 07/16/2016] [Indexed: 01/16/2023]
Abstract
Given the mode of transmission of Middle East respiratory syndrome (MERS), healthcare workers (HCWs) in contact with MERS patients are expected to be at risk of MERS infections. We evaluated the prevalence of MERS coronavirus (CoV) immunoglobulin (Ig) G in HCWs exposed to MERS patients and calculated the incidence of MERS-affected cases in HCWs. We enrolled HCWs from hospitals where confirmed MERS patients had visited. Serum was collected 4 to 6 weeks after the last contact with a confirmed MERS patient. We performed an enzyme-linked immunosorbent assay (ELISA) to screen for the presence of MERS-CoV IgG and an indirect immunofluorescence test (IIFT) to confirm MERS-CoV IgG. We used a questionnaire to collect information regarding the exposure. We calculated the incidence of MERS-affected cases by dividing the sum of PCR-confirmed and serology-confirmed cases by the number of exposed HCWs in participating hospitals. In total, 1169 HCWs in 31 hospitals had contact with 114 MERS patients, and among the HCWs, 15 were PCR-confirmed MERS cases in study hospitals. Serologic analysis was performed for 737 participants. ELISA was positive in five participants and borderline for seven. IIFT was positive for two (0.3%) of these 12 participants. Among the participants who did not use appropriate personal protective equipment (PPE), seropositivity was 0.7% (2/294) compared to 0% (0/443) in cases with appropriate PPE use. The incidence of MERS infection in HCWs was 1.5% (17/1169). The seroprevalence of MERS-CoV IgG among HCWs was higher among participants who did not use appropriate PPE.
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Affiliation(s)
- C-J Kim
- Department of Internal Medicine, Division of Infectious Diseases, Ewha Womans University School of Medicine, South Korea
| | - W S Choi
- Division of Infectious Diseases, Department of Internal Medicine, Korea University College of Medicine, Seoul, South Korea
| | - Y Jung
- Department of Internal Medicine, Konyang University Hospital, South Korea
| | - S Kiem
- Department of Internal Medicine, Inje University Haeundae Paik Hospital, South Korea
| | - H Y Seol
- Department of Internal Medicine, Good GangAn Hospital, South Korea
| | - H J Woo
- Department of Internal Medicine, Hallym University Dongtan Sacred Heart Hospital, South Korea
| | - Y H Choi
- Department of Internal Medicine, Ajou University Hospital, South Korea
| | - J S Son
- Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, South Korea
| | - K-H Kim
- Department of Internal Medicine, Pusan National University Hospital, South Korea
| | - Y-S Kim
- Division of Infectious Diseases, Department of Internal Medicine, Chungnam National University School of Medicine, South Korea
| | - E S Kim
- Department of Internal Medicine, Seoul National University Bundang Hospital, South Korea
| | - S H Park
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Daejeon St. Mary's Hospital, South Korea
| | - J H Yoon
- Department of Internal Medicine, Eulji University Hospital, South Korea
| | - S-M Choi
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Yeouido St. Mary's Hospital, South Korea
| | - H Lee
- Division of Infectious Diseases, Dong-A University Hospital, South Korea
| | - W S Oh
- Department of Internal Medicine, Kangwon National University Hospital, South Korea
| | - S-Y Choi
- Department of Neurology, Dae Cheong Hospital, South Korea
| | - N-J Kim
- Department of Internal Medicine, Seoul National University Hospital, South Korea
| | - J-P Choi
- Department of Internal Medicine, Seoul Medical Center, South Korea
| | - S Y Park
- Department of Internal Medicine, Hallym University Kangdong Sacred Heart Hospital, South Korea
| | - J Kim
- Department of Internal Medicine, Hanyang University Guri Hospital, South Korea
| | - S J Jeong
- Department of Internal Medicine, Gangnam Severance Hospital, South Korea
| | - K S Lee
- Department of Internal Medicine, Myongji Hospital, South Korea
| | - H C Jang
- Department of Internal Medicine, Chonnam National University Hospital, South Korea
| | - J Y Rhee
- Department of Internal Medicine, Dankook University Hospital, South Korea
| | - B-N Kim
- Department of Internal Medicine, Inje University Sanggye Paik Hospital, South Korea
| | - J H Bang
- Department of Internal Medicine, Borame Medical Center, South Korea
| | - J H Lee
- Department of Internal Medicine, Wonkwang University Hospital, South Korea
| | - S Park
- Department of Family Medicine, Seobuk Hospital Seoul Metropolitan Government, South Korea
| | - H Y Kim
- Department of Internal Medicine, Wonju Severance Christian Hospital, South Korea
| | - J K Choi
- Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Bucheon St. Mary's Hospital, South Korea
| | - Y-M Wi
- Department of Internal Medicine, Samsung Changwon Hospital, South Korea
| | - H J Choi
- Department of Internal Medicine, Division of Infectious Diseases, Ewha Womans University School of Medicine, South Korea.
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Kim E, Kim BG, Lim YJ, Jeon YT, Hwang JW, Kim HC, Choi YH, Park HP. A prospective randomised trial comparing insertion success rate and incidence of catheterisation-related complications for subclavian venous catheterisation using a thin-walled introducer needle or a catheter-over-needle technique. Anaesthesia 2016; 71:1030-6. [DOI: 10.1111/anae.13543] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/25/2016] [Indexed: 11/30/2022]
Affiliation(s)
- E. Kim
- Department of Anaesthesiology and Pain Medicine; School of Medicine; Catholic University of Daegu; Daegu Korea
| | - B. G. Kim
- Department of Anaesthesiology and Pain Medicine; Inha University Hospital; Inha University College of Medicine; Incheon Korea
| | - Y. J. Lim
- Department of Anaesthesiology and Pain Medicine; Seoul National University Hospital; Seoul National University College of Medicine; Seoul Korea
| | - Y. T. Jeon
- Seoul National University Bundang Hospital; Seoul National University College of Medicine; Seongnam Korea
| | - J. W. Hwang
- Seoul National University Bundang Hospital; Seoul National University College of Medicine; Seongnam Korea
| | - H. C. Kim
- Department of Anaesthesiology and Pain Medicine; Keimyung University Dongsan Hospital; Keimyung University School of Medicine; Daegu Korea
| | - Y. H. Choi
- Department of Anaesthesiology and Pain Medicine; Seoul National University Hospital; Seoul National University College of Medicine; Seoul Korea
| | - H. P. Park
- Department of Anaesthesiology and Pain Medicine; Seoul National University Hospital; Seoul National University College of Medicine; Seoul Korea
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Choi YH, Yoshimura Y, Kim KJ, Lee K, Kim TW, Ono T, You CY, Jung MH. Field-driven domain wall motion under a bias current in the creep and flow regimes in Pt/[CoSiB/Pt]N nanowires. Sci Rep 2016; 6:23933. [PMID: 27030379 PMCID: PMC4814914 DOI: 10.1038/srep23933] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Accepted: 03/16/2016] [Indexed: 11/09/2022] Open
Abstract
The dynamics of magnetic domain wall (DW) in perpendicular magnetic anisotropy Pt/[CoSiB/Pt]N nanowires was studied by measuring the DW velocity under a magnetic field (H) and an electric current (J) in two extreme regimes of DW creep and flow. Two important findings are addressed. One is that the field-driven DW velocity increases with increasing N in the flow regime, whereas the trend is inverted in the creep regime. The other is that the sign of spin current-induced effective field is gradually reversed with increasing N in both DW creep and flow regimes. To reveal the underlying mechanism of new findings, we performed further experiment and micromagnetic simulation, from which we found that the observed phenomena can be explained by the combined effect of the DW anisotropy, Dzyaloshinskii-Moriya interaction, spin-Hall effect, and spin-transfer torques. Our results shed light on the mechanism of DW dynamics in novel amorphous PMA nanowires, so that this work may open a path to utilize the amorphous PMA in emerging DW-based spintronic devices.
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Affiliation(s)
- Y H Choi
- Department of Physics, Sogang University, Seoul 121-742 Korea
| | - Y Yoshimura
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - K-J Kim
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - K Lee
- Institute of Physics, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
| | - T W Kim
- Department of Advanced Materials Engineering, Sejong University, Seoul 143-747 Korea
| | - T Ono
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - C-Y You
- Department of Physics, Inha University, Incheon 402-751, Korea
| | - M H Jung
- Department of Physics, Sogang University, Seoul 121-742 Korea
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30
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Yang DG, Choi YH, Kim YG, Song JB, Lee HG. Analytical and experimental investigation of electrical characteristics of a metallic insulation GdBCO coil. Rev Sci Instrum 2016; 87:034701. [PMID: 27036797 DOI: 10.1063/1.4942911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 02/12/2016] [Indexed: 06/05/2023]
Abstract
This paper presents results, experimental and analytical, of the electrical characteristics of GdBCO single-pancake coils co-wound with a brass tape as metallic insulation (MI coil). The GdBCO pancakes were subjected to sudden discharge, charge-discharge, and over-current tests. The sudden discharge and charge-discharge test results of the MI coil demonstrated that MI coils can be charged and discharged significantly faster than non-insulated coils that are wound only with GdBCO tape. In over-current tests at 150 A (1.25I(c)), the MI coil exhibited better electrical behavior, i.e., self-protecting features, than its counterpart co-wound with Kapton tape, an insulator. Moreover, the experimental and analytical results are in agreement, validating the use of a concise equivalent parallel-RL circuit model for the MI coil to characterize its electrical behavior. Overall, the MI winding technique is highly promising to help build compact, mechanically robust, and self-protecting magnets composed of REBCO pancake coils. With no organic material in the winding, MI REBCO pancakes will be immune to neutron radiation damage, making the MI winding technique a viable option for fusion reactors, such as for toroidal field, poroidal field magnets, and central solenoid.
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Affiliation(s)
- D G Yang
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - Y H Choi
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - Y G Kim
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - J B Song
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
| | - H G Lee
- Department of Materials Science and Engineering, Korea University, Anam-dong 5 ga, Seongbuk-gu, Seoul 136-713, South Korea
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31
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Jeon KS, Sung JH, Lee MW, Song HY, Shin HY, Park WH, Jang YI, Kang MG, Choi YH, Lee JS, Ko DH, Ryu HY. A Study of Piezoelectric Field Related Strain Difference in GaN-Based Blue Light-Emitting Diodes Grown on Silicon(111) and Sapphire Substrates. J Nanosci Nanotechnol 2016; 16:1798-1801. [PMID: 27433673 DOI: 10.1166/jnn.2016.11939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We investigate the strain difference in InGaN/GaN multiple quantum wells of blue light-emitting diode (LED) structures grown on silicon(1 11) and c-plane sapphire substrates by comparing the strength of piezo-electric fields in MQWs. The piezo-electric fields for two LED samples grown on silicon and sapphire substrates are measured by using the reverse-bias electro-reflectance (ER) spectroscopy. The flat-band voltage is obtained by measuring the applied reverse bias voltage that induces a phase inversion in the ER spectra, which is used to calculate the strength of piezo-electric fields. The piezo-electric field is determined to be 1.36 MV/cm for the LED on silicon substrate and 1.83 MV/cm for the LED on sapphire substrate. The ER measurement results indicate that the strain-induced piezo-electric field is greatly reduced in the LED grown on silicon substrates consistent with previous strain measurement results by micro-Raman spectroscopy and high-resolution transmission electron microscopy.
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Kim KH, Hosseindoust A, Ingale SL, Lee SH, Noh HS, Choi YH, Jeon SM, Kim YH, Chae BJ. Effects of Gestational Housing on Reproductive Performance and Behavior of Sows with Different Backfat Thickness. Asian-Australas J Anim Sci 2016; 29:142-8. [PMID: 26732338 PMCID: PMC4698681 DOI: 10.5713/ajas.14.0973] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Revised: 02/03/2015] [Accepted: 09/01/2015] [Indexed: 11/27/2022]
Abstract
The present study investigated the effects of back-fat thickness at d 107 of gestation and housing types during gestation on reproductive performance and behavior of sows. A total of 64 crossbred sows (Landrace×Yorkshire) in their 3 to 4 parities were allotted to one of four treatments (n = 16) over two consecutive parities. During each parity, sows were assigned to two gestational housing types (stall or group housing) and two level of back-fat thickness (<20 or ≥20) at d 107 of gestation. Gestating sows were transferred from gestational crates to stalls or pens (group housing) 5 weeks before farrowing. All sows were moved to farrowing crates on d 109 of gestation. At weaning, back-fat thickness changes were lesser (p<0.05) in sows having back-fat thickness <20 mm than that of sows with ≥20 mm back-fat thickness at 107 d of gestation. Group housed sows had greater (p<0.05) feed intake and shorter (p<0.05) weaning-to-estrus interval than that of sows in stalls. At weaning, back-fat thickness changes were lesser (p<0.05) in group housed sows than that of sows in stalls. The number of piglets at weaning, growth rate and average daily gain were greater (p<0.05) in group housed sows than that of sows in stalls. During gestation, walking duration was more (p<0.05) in group housed sows. Group housed sows had lesser (p<0.05) farrowing duration and greater (p<0.05) eating time than that of sows in stalls. Result obtained in present study indicated that sows with ≥20 mm back-fat thickness at 107 days had better reproductive performance. Additionally, group housing of sows during last five week of gestation improved the performance and behavior and reproductive efficiency of sows.
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Affiliation(s)
- K H Kim
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - A Hosseindoust
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - S L Ingale
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - S H Lee
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - H S Noh
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - Y H Choi
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - S M Jeon
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - Y H Kim
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
| | - B J Chae
- Department of Animal Resources Development, Swine Science Division, National Institute of Animal Science, RDA, Cheonan, 31000, Korea
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Hinrichs K, Choi YH. 251 FACTORS INFLUENCING THE SUCCESS OF EQUINE INTRACYTOPLASMIC SPERM INJECTION IN A CLINICAL PROGRAM. Reprod Fertil Dev 2016. [DOI: 10.1071/rdv28n2ab251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Intracytoplasmic sperm injection (ICSI) is currently being used clinically in horses, but little information is available on factors affecting its success. We have conducted research trials and evaluated data from our clinical ICSI caseload, currently over 450 cases per year, to provide information in this area. In the following summaries, blastocyst data are reported per injected oocyte; clinical data are from 2013 and 2014. Clinically, when immature follicles were aspirated, the number of follicles aspirated per mare decreased significantly with mare age, from 16.2 at age 12–15 to 8.9 at age 24–25; however, maturation and blastocyst rates of recovered oocytes did not differ significantly. Immature oocytes shipped to the laboratory by referring veterinarians yielded a significantly higher blastocyst rate than that for immature oocytes aspirated at the laboratory (27 v. 21%, respectively). Shipped oocytes recovered from stimulated preovulatory follicles yielded a higher blastocyst rate per oocyte than did shipped immature oocytes (39 v. 27%, respectively), but provided fewer mature oocytes per aspiration (1.0 v. 4.5 for immature). From research data, administration of gentamicin and ampicillin to mares before immature oocyte aspiration did not affect blastocyst rate. Holding the aspirate for ~1.5 h at ambient temperature (26 to 33°C) was associated with a blastocyst rate of 32%; however, holding for 2 h at 32°C yielded only 16% blastocysts v. 23% for control. Blastocysts (18%) were obtained from oocytes recovered in the nonbreeding season (December and January). Holding oocytes at room temperature overnight before maturation did not affect blastocyst rate (25 to 34%), nor did inclusion of zinc in the maturation medium (18 to 31%). Diluting and refreezing semen to increase doses available for ICSI did not affect blastocyst rate (23 to 27%); blastocysts (13%) were also obtained after injection of nonmotile sperm. Significant differences in cleavage and blastocyst rates were identified among stallions. For one stallion, use of density gradient plus swim-up before ICSI increased cleavage (49 v. 18%) and blastocyst rates (11 v. 0%) compared to density gradient alone. Blastocyst production was not affected by the amount of glucose added to a human embryo culture medium (0 or 5 mM added glucose on Days 0–5, then 10 or 20 mM added glucose; 31 to 46% blastocysts). Replacement of 10% FBS in embryo culture medium with a mixture of FBS, human serum replacement, and equine follicular fluid lowered blastocyst rate (15 v. 37% for FBS alone). Clinically, embryos were vitrified or were shipped to embryo transfer centers for transfer. There was no significant difference in ongoing pregnancy rate for embryos from shipped immature v. preovulatory oocytes (54 and 69%). For immature oocytes, embryos developing to blastocyst on Day 10 or 11 had a lower ongoing pregnancy rate after transfer (40 and 0%) than did those developing on Days 7 to 9 (51 to 75%).
This work was supported by the Link Equine Research Endowment Fund, Texas A&M University, and by the Clinical Equine ICSI Program, Texas A&M University.
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Gonçalves AL, Abreu AC, Coqueiro A, Gaspar A, Borges F, Choi YH, Pires JCM, Simões M. Co-cultivation of Synechocystis salina and Pseudokirchneriella subcapitata under varying phosphorus concentrations evidences an allelopathic competition scenario. RSC Adv 2016. [DOI: 10.1039/c6ra07771d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This study suggests growth inhibition ofSynechocystis salinawhen co-cultured withPseudokirchneriella subcapitatathrough the production of an allelochemical – lactic acid.
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Affiliation(s)
- A. L. Gonçalves
- LEPABE
- Departamento de Engenharia Química
- Faculdade de Engenharia
- Universidade do Porto
- 4200-465 Porto
| | - A. C. Abreu
- LEPABE
- Departamento de Engenharia Química
- Faculdade de Engenharia
- Universidade do Porto
- 4200-465 Porto
| | - A. Coqueiro
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- Leiden
- The Netherlands
| | - A. Gaspar
- CIQUP
- Department of Chemistry and Biochemistry
- Faculty of Sciences
- University of Porto
- Porto
| | - F. Borges
- CIQUP
- Department of Chemistry and Biochemistry
- Faculty of Sciences
- University of Porto
- Porto
| | - Y. H. Choi
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- Leiden
- The Netherlands
| | - J. C. M. Pires
- LEPABE
- Departamento de Engenharia Química
- Faculdade de Engenharia
- Universidade do Porto
- 4200-465 Porto
| | - M. Simões
- LEPABE
- Departamento de Engenharia Química
- Faculdade de Engenharia
- Universidade do Porto
- 4200-465 Porto
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Choi YH, Gibbons JR, Canesin HS, Hinrichs K. 220 EFFECT OF ZINC SUPPLEMENTATION DURING IN VITRO MATURATION ON EQUINE BLASTOCYST RATES AFTER INTRACYTOPLASMIC SPERM INJECTION. Reprod Fertil Dev 2016. [DOI: 10.1071/rdv28n2ab220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Use of intracytoplasmic sperm injection (ICSI) in horses has growing clinical and research importance; however, little is known of factors affecting efficacy of this system. Supplementation of zinc during in vitro maturation (IVM) has been shown to increase oocyte glutathione levels, decrease reactive oxygen species, and increase blastocyst rates in vitro in cattle and pigs, but has not been evaluated in the horse. In this study, we examined the effect of zinc supplementation during IVM on rates of maturation and blastocyst formation after ICSI. Oocytes were collected from follicles ≥5 mm in diameter in live mares. Blood serum and follicular fluid from 15- to 30-mm follicles were collected from 3 mares for zinc analysis by flame atomic absorption spectrometry. Oocytes were held overnight at room temperature (Choi et al. 2006 Theriogenology 66, 955–963), and then randomly assigned to IVM in the presence of 1 of 4 concentrations of added zinc (0.0, 0.5, 1.0, and 1.5 μg mL–1), added as ZnSO4·7H2O. The oocytes were cultured for IVM in M199 with Earle’s salts, 5 mU mL–1 FSH, and 10% fetal bovine serum (FBS) for 30 h. The oocytes were then denuded of cumulus and those with a polar body subjected to ICSI with frozen-thawed sperm. Presumptive zygotes were cultured in a commercial human embryo culture medium (LifeGlobal; http://www.lifeglobalgroup.com/), supplemented with 10% FBS, under 6% CO2, 5% O2, and 89% N2 at 38.2°C. On Day 5 (Day 0 = injection day), embryos were evaluated for presumptive cleavage and transferred to medium with 20 mM added glucose. Blastocyst formation was evaluated on Days 7 to 11. Data were analysed by Fisher’s exact test. The mean zinc concentrations in mare serum and follicular fluid were 0.50 and 0.44 μg mL–1, respectively. The mean zinc concentration of the FBS was 2.70 μg mL–1, and that of IVM medium containing 10% FBS were 0.28, 0.80, 1.23, and 1.68 μg mL–1 for the 0.0, 0.5, 1.0, and 1.5 μg mL–1 added-zinc treatments, respectively. The rates of oocyte maturation were not significantly different among treatments (43/61, 70%; 46/70, 66%; 45/71, 63%; and 49/70, 70%, respectively). Neither cleavage rates (81–92%) nor blastocyst rates (12/42, 29%; 9/43, 21%, 8/44, 18%, and 15/48, 31%, respectively) differed significantly among treatments. However, the proportion of blastocysts that developed on Day 7 out of total blastocysts was higher for the combined added-zinc treatments (0.5, 1, and 1.5 μg mL–1) than for the treatment with no added zinc (15/32, 47% v. 1/12, 8%, respectively; P < 0.05). These results indicate that supplementation of zinc to the IVM medium used did not influence equine oocyte maturation or blastocyst development rates but may have improved embryo quality, as reflected in earlier blastocyst development. The more subtle response seen, compared with that reported in other species, may be because the 10% FBS resulted in zinc concentrations in the basal medium (0.28 μg mL–1) only slightly lower than that in equine follicular fluid (0.44 μg mL–1).
This work was supported by the Link Equine Research Endowment Fund, Texas A&M University, and by the Clinical Equine ICSI Program, Texas A&M University.
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Abreu AC, Paulet D, Coqueiro A, Malheiro J, Borges A, Saavedra MJ, Choi YH, Simões M. Antibiotic adjuvants from Buxus sempervirens to promote effective treatment of drug-resistant Staphylococcus aureus biofilms. RSC Adv 2016. [DOI: 10.1039/c6ra21137b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Plants have been long scrutinized in the quest for new antibiotics, but no strong antibiotic molecule was ever found.
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Affiliation(s)
- A. C. Abreu
- LEPABE
- Department of Chemical Engineering
- Faculty of Engineering
- University of Porto
- 4200-465 Porto
| | - D. Paulet
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- Leiden
- The Netherlands
| | - A. Coqueiro
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- Leiden
- The Netherlands
| | - J. Malheiro
- LEPABE
- Department of Chemical Engineering
- Faculty of Engineering
- University of Porto
- 4200-465 Porto
| | - A. Borges
- LEPABE
- Department of Chemical Engineering
- Faculty of Engineering
- University of Porto
- 4200-465 Porto
| | - M. J. Saavedra
- CECAV
- Veterinary and Animal Science Research Center and Veterinary Science Department
- University of Trás-os-Montes and Alto Douro
- 5000-801 Vila Real
- Portugal
| | - Y. H. Choi
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- Leiden
- The Netherlands
| | - M. Simões
- LEPABE
- Department of Chemical Engineering
- Faculty of Engineering
- University of Porto
- 4200-465 Porto
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Canesin HS, Ortiz I, Brom-de-Luna JG, Choi YH, Hinrichs K. 43 MASS VITRIFICATION OF GERMINAL-VESICLE STAGE EQUINE OOCYTES. Reprod Fertil Dev 2016. [DOI: 10.1071/rdv28n2ab43] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Oocyte cryopreservation has the potential to preserve female genetics. In addition, equine oocytes are not readily available in some areas, and vitrification could be used to accumulate oocytes at remote locations to provide material for research. To preserve large numbers of oocytes, a method for rapid vitrification of multiple oocytes is needed. First, we determined whether immature equine oocytes could be held overnight before vitrification, and we tested the use of a mesh+capillary-action media-removal vitrification platform. Oocytes were collected via ultrasound-guided transvaginal follicle aspiration and randomly allotted to either immediate vitrification or overnight holding (24 to 27 h in 40% M199-Earle’s salts, 40% M199-Hanks’ salts, 20% fetal bovine serum, and 0.3 mM pyruvate) then vitrification. Oocytes were vitrified using different times (1 or 4 min) in vitrification solution and first warming solution: 1v1w, 1v4w, 4v1w, and 4v4w. The base solution was MH (80% M199-Hanks’ salts and 20% fetal bovine serum). Cryoprotectant concentration (vol/vol) was increased in 3 steps until reaching 7.5% dimethyl sulfoxide and 7.5% ethylene glycol. The oocytes were then held in vitrification solution (MH with 15% dimethyl sulfoxide, 15% ethylene glycol, and 0.5 M sucrose) for either 1 or 4 min, according to treatment, and 3 to 10 oocytes were transferred to a 75-μm sterile stainless steel mesh. The mesh was placed on sterile paper to absorb excess medium, then plunged in LN. The oocytes were warmed in MH solution with 1.25 M sucrose for either 1 or 4 min, then placed in 0.62 M and 0.31 M sucrose solutions for 5 min each and undetermined time in MH. After warming, oocytes were cultured for maturation (in vitro maturation) in M199-Earle’s salts, 5 mU mL–1 FSH, and 10% fetal bovine serum. After 30 to 36 h, the oocytes were denuded and stained with Hoechst 33258. Data were analysed by Fisher’s exact test. There were no significant differences (P > 0.05) in rates of meiotic resumption among timing treatments (35, 24, 26, and 39% for 1v1w, 1v4w, 4v1w, and 4v4w, respectively), nor between immediately vitrified (17/55, 31%) and overnight held-vitrified groups (18/56, 32%). In the second experiment, all oocytes were held overnight. They were vitrified and warmed using only the 1v1w and 4v4w schedules, then subjected to in vitro maturation, intracytoplasmic sperm injection, and embryo culture. The MII rate of the control group (27/37, 73%) was higher (P < 0.05) than that for 1v1w (12/33, 36%) or 4v4w treatments (10/35, 29%). The cleavage rate for control (25/27, 93%) was higher than that for 1v1w (5/9, 56%) but not than that for 4v4w (6/9, 67%). Blastocyst rates were 19% (5/27), 11% (1/9), and 0% (0/9) for control, 1v1w, and 4v4w, respectively (P > 0.05). These results indicate that blastocysts may be produced from equine immature oocytes vitrified en masse; however, both the maturation and blastocyst production rates were relatively low. Additional studies are required to improve the efficiency of this technique.
This work was supported by the Clinical Equine ICSI Program, Texas A&M University.
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Cho HH, Cheon JE, Kim SK, Choi YH, Kim IO, Kim WS, Lee SM, You SK, Shin SM. Quantitative Assessment of Neovascularization after Indirect Bypass Surgery: Color-Coded Digital Subtraction Angiography in Pediatric Moyamoya Disease. AJNR Am J Neuroradiol 2015; 37:932-8. [PMID: 26680463 DOI: 10.3174/ajnr.a4614] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 09/15/2015] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE For the postoperative follow-up in pediatric patients with Moyamoya disease, it is essential to evaluate the degree of neovascularization status. Our aim was to quantitatively assess the neovascularization status after bypass surgery in pediatric Moyamoya disease by using color-coded digital subtraction angiography. MATERIALS AND METHODS Time-attenuation intensity curves were generated at ROIs corresponding to surgical flap sites from color-coded DSA images of the common carotid artery, internal carotid artery, and external carotid artery angiograms obtained pre- and postoperatively in 32 children with Moyamoya disease. Time-to-peak and area under the curve values were obtained. Postoperative changes in adjusted time-to-peak (ΔTTP) and ratios of adjusted area under the curve changes (ΔAUC ratio) of common carotid artery, ICA, and external carotid artery angiograms were compared across clinical and angiographic outcome groups. To analyze diagnostic performance, we categorized clinical outcomes into favorable and unfavorable groups. RESULTS The ΔTTP at the common carotid artery increased among clinical and angiographic outcomes, in that order, with significant differences (P = .003 and .005, respectively). The ΔAUC ratio at the common carotid artery and external carotid artery also increased, in that order, among clinical and angiographic outcomes with a significant difference (all, P = .000). The ΔAUC ratio of ICA showed no significant difference among clinical and angiographic outcomes (P = .418 and .424, respectively). The ΔTTP for the common carotid artery of >1.27 seconds and the ΔAUC ratio of >33.5% for the common carotid artery and 504% for the external carotid artery are revealed as optimal cutoff values between favorable and unfavorable groups. CONCLUSIONS Postoperative changes in quantitative values obtained with color-coded DSA software showed a significant correlation with outcome scores and can be used as objective parameters for predicting the outcome in pediatric Moyamoya disease, with an additional cutoff value calculated through the receiver operating characteristic curve.
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Affiliation(s)
- H-H Cho
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea
| | - J-E Cheon
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea Department of Radiology (J.-E.C., Y.H.C., I.-O.K., W.S.K.), Seoul National University College of Medicine, Seoul, Korea Institute of Radiation Medicine (J.-E.C., I.-O.K., W.S.K.), Seoul National University Medical Research Center, Seoul, Korea
| | - S-K Kim
- Division of Pediatric Neurosurgery (S.-K.K.), Seoul National University Children's Hospital, Seoul, Korea
| | - Y H Choi
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea Department of Radiology (J.-E.C., Y.H.C., I.-O.K., W.S.K.), Seoul National University College of Medicine, Seoul, Korea
| | - I-O Kim
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea Department of Radiology (J.-E.C., Y.H.C., I.-O.K., W.S.K.), Seoul National University College of Medicine, Seoul, Korea Institute of Radiation Medicine (J.-E.C., I.-O.K., W.S.K.), Seoul National University Medical Research Center, Seoul, Korea
| | - W S Kim
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea Department of Radiology (J.-E.C., Y.H.C., I.-O.K., W.S.K.), Seoul National University College of Medicine, Seoul, Korea Institute of Radiation Medicine (J.-E.C., I.-O.K., W.S.K.), Seoul National University Medical Research Center, Seoul, Korea
| | - S-M Lee
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea
| | - S K You
- From the Department of Radiology (H.-H.C., J.-E.C., Y.H.C., I.-O.K., W.S.K., S.-M.L., S.K.Y.), Seoul National University Hospital, Seoul, Korea
| | - S-M Shin
- Department of Radiology (S.-M.S.), Seoul Metropolitan Government-Seoul National University, Boramae Medical Center, Seoul, Korea
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Kim SS, Lee SY, Park KJ, Park SM, An HJ, Hyun JM, Choi YH. Gluconacetobacter sp. gel_SEA623-2, bacterial cellulose producing bacterium isolated from citrus fruit juice. Saudi J Biol Sci 2015; 24:314-319. [PMID: 28149167 PMCID: PMC5272943 DOI: 10.1016/j.sjbs.2015.09.031] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 09/25/2015] [Accepted: 09/27/2015] [Indexed: 11/24/2022] Open
Abstract
Cellulose producing bacterial strain was isolated from citrus fruit juice fungus. The isolated strain was identified as Gluconacetobacter sp. gel_SEA623-2 based on several morphological characteristics, biochemical tests, and 16S rRNA conducted. Culture conditions for bacterial cellulose production by SEA623-2 were screened in static trays. Conditions were extensively optimized by varying the kind of fruit juice, pH, sugar concentration, and temperature for maximum cellulose production. SEA623-2 has a high productive capacity in citrus processing medium, but not in other fruits. The optimal combination of the media constituents for bacterial cellulose production is as follows: 10% citrus juice, 10% sucrose, 1% acetic acid, and 1% ethanol at 30 °C, pH 3.5. Bacterial cellulose produced by SEA623-2 has soft physical properties, high tensile strength, and high water retention value. The cellulose produced by the selected bacteria is suitable as a cosmetic and medical material.
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Affiliation(s)
- S S Kim
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
| | - S Y Lee
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
| | - K J Park
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
| | - S M Park
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
| | - H J An
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
| | - J M Hyun
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
| | - Y H Choi
- Citrus Research Institute, National Institute of Horticultural & Herbal Science, RDA, Jeju 697-943, Republic of Korea
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Jeon YP, Choi YH, Kim TW. Efficiency Enhancement of Organic Light-Emitting Devices Fabricated Using a 1,4,5,8,9,11-Hexaazatriphenylene Hexacarbonitrile Silver Electrode. J Nanosci Nanotechnol 2015; 15:7791-7794. [PMID: 26726414 DOI: 10.1166/jnn.2015.11190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A 1,4,5,8,9,11-hexaazatriphenylene hexacarbonitrile (HAT-CN)/Ag/HAT-CN transparent electrode for organic light-emitting devices (OLEDs) was investigated. The current density of OLEDs was enhanced with an increase in the Ag layer thickness of a HAT-CN/Ag/HAT-CN anode. While the luminance of the OLEDs with a HAT-CN/Ag/HAT-CN anode slightly decreased with increasing thickness of the upper HAT-CN layer, the current efficiency of the OLEDs with thicknesses for the Ag layer of 20 nm and for the upper HAT-CN layer of 100 nm was almost two times higher than that of OLEDs with an ITO anode. Electroluminescence spectra of the OLEDs with a HAT-CN/Ag/HAT-CN anode were shifted due to the micro-cavity effect in the stacked anode, which was confirmed by the transmittance spectra.
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Choi YH, Kalverkamp S, Autschbach R, Spillner J. Diagnose eines Doege-Potter Syndroms durch rezidivierende Hypogycämien: Ein ungewöhnlicher Fall eines großen solitären fibrösen Tumors mit Literaturübersicht. Zentralbl Chir 2015. [DOI: 10.1055/s-0035-1559912] [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: 10/23/2022]
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Kalverkamp S, Choi YH, Autschbach R, Spillner J. „ ...wenn die thorakoabdominelle Grenze überschritten wird...“: Eine Aerobilie pulmonalen Ursprungs. Zentralbl Chir 2015. [DOI: 10.1055/s-0035-1559935] [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: 10/23/2022]
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Harding-Esch E, Sherrard-Smith E, Dangerfield C, Choi YH, Green N, Jit M, Marshall RD, Mercer C, Nardone A, Howell-Jones R, Johnson OA, Clarkson J, Wolstenholme J, Price CP, Gaydos CA, Sadiq ST, White PJ, Lowndes CM. P08.29 Web-tool to assess the cost-effectiveness of chlamydia point-of-care tests at the local level. Br J Vener Dis 2015. [DOI: 10.1136/sextrans-2015-052270.375] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Jeon KS, Sung JH, Lee MW, Song HY, Lee EA, Kim SO, Choi HJ, Shin HY, Park WH, Jang YI, Kang MG, Choi YH, Lee JS, Ko DH, Ryu HY. Comparison of Strain in GaN-Based Blue Light-Emitting Diode Grown on Silicon(111) and Sapphire Substrates. J Nanosci Nanotechnol 2015; 15:5264-5266. [PMID: 26373120 DOI: 10.1166/jnn.2015.10408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We compare the strain states and device performances of GaN-based blue light-emitting diodes (LEDs) grown on Si(111) and sapphire substrates. The strain characteristics are investigated using micro-Raman spectroscopy and high-resolution transmission electron microscopy. These analyses reveal that GaN layer grown on Si has a residual tensile strain in contrast to a compressive strain for GaN on sapphire, and quantum wells (QWs) on GaN/Si experience reduced lattice mismatch than those of GaN/sapphire. When external quantum efficiencies of LED on sapphire and Si substrates are compared, the LED on Si shows better efficiency droop characteristics and this is attributed to a decrease in piezo-electric field strength in InGaN/GaN layers owing to reduced lattice mismatch.
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Choi YH, Penedo MCT, Daftari P, Velez IC, Hinrichs K. Accuracy of preimplantation genetic diagnosis in equine in vivo-recovered and in vitro-produced blastocysts. Reprod Fertil Dev 2015; 28:RD14419. [PMID: 25775205 DOI: 10.1071/rd14419] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Accepted: 01/19/2015] [Indexed: 02/28/2024] Open
Abstract
Preimplantation genetic diagnosis has great potential in the horse, but information on evaluation of equine embryo biopsy samples is limited. Blastocysts were biopsied using a Piezo drill and methods for whole-genome amplification (WGA) investigated. Results for 33 genetic loci were then compared between biopsy samples from in vitro-produced (IVP) and in vivo-recovered (VIV) blastocysts. Under the experimental conditions described, WGA using the Qiagen Repli-g Midi kit was more accurate than that using the Illustra Genomiphi V2 kit (98.2% vs 25.8%, respectively). Using WGA with the Qiagen kit, three biopsy samples were evaluated from each of eight IVP and 19 VIV blastocysts, some produced using semen from stallions carrying the genetic mutations associated with the diseases hereditary equine regional dermal asthenia (HERDA), hyperkalemic periodic paralysis (HYPP) or polysaccharide storage myopathy 1 (PSSM1). Three of 81 biopsy samples (3.7%) returned 95% overall accuracy in IVP and VIV embryos, and this technique is suitable for use in a clinical setting.
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Rozema E, van Dam AD, Sips HCM, Verpoorte R, Meijer OC, Kooijman S, Choi YH. Extending pharmacological dose-response curves for salsalate with natural deep eutectic solvents. RSC Adv 2015. [DOI: 10.1039/c5ra10196d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Natural deep eutectic solvents (NADES) are recently developed green solvents that are attractive for their great solubilising power and intrinsic lack of toxicity.
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Affiliation(s)
- E. Rozema
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- 2333 BE Leiden
- The Netherlands
| | - A. D. van Dam
- Department of Medicine
- Division of Endocrinology
- Post Zone C7Q. Leiden University Medical Center
- 2300 RC Leiden
- The Netherlands
| | - H. C. M. Sips
- Department of Medicine
- Division of Endocrinology
- Post Zone C7Q. Leiden University Medical Center
- 2300 RC Leiden
- The Netherlands
| | - R. Verpoorte
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- 2333 BE Leiden
- The Netherlands
| | - O. C. Meijer
- Department of Medicine
- Division of Endocrinology
- Post Zone C7Q. Leiden University Medical Center
- 2300 RC Leiden
- The Netherlands
| | - S. Kooijman
- Department of Medicine
- Division of Endocrinology
- Post Zone C7Q. Leiden University Medical Center
- 2300 RC Leiden
- The Netherlands
| | - Y. H. Choi
- Natural Products Laboratory
- Institute of Biology
- Leiden University
- 2333 BE Leiden
- The Netherlands
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Choi YH, Velez IC, Macías-García B, Hinrichs K. 38 EFFECT OF OOCYTE MATURATION DURATION ON BLASTOCYST RATES AFTER EQUINE SOMATIC CELL NUCLEAR TRANSFER. Reprod Fertil Dev 2015. [DOI: 10.1071/rdv27n1ab38] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
In equine cloning, the scarcity of equine oocytes places emphasis on development of the most efficient nuclear transfer (NT) methods possible. In other species, using oocytes matured for the shortest duration needed to reach metaphase II has increased NT efficiency. In the present study, we examined the effect of duration of oocyte maturation at the time of enucleation on equine cloned blastocyst production. Oocytes were collected from live mares by transvaginal ultrasound-guided aspiration of all visible follicles ≥5 mm in diameter. The oocytes were held overnight (16–22 h) at room temperature, matured in vitro, and reconstructed with donor cells as described in our previous study (Choi et al. 2013 Theriogenology 79, 791–796). In Experiment 1, oocytes were divided into 2 groups and matured for 20 or 24 h. After enucleation, oocytes were reconstructed by direct injection of donor cells. Reconstructed oocytes were held for 5 h and then activated by treatment with 5 μM ionomycin for 4 min, then injection with sperm extract, followed by incubation in 2 mM 6-DMAP for 4 h. The activated reconstructed oocytes were cultured in global human embryo culture medium under 5% CO2, 6% O2, and 89% N2 at 38.2°C for 7 to 11 days (20 mM glucose was added at Day 5) and blastocyst rate was recorded. Because a low maturation rate was found at 20 h in Experiment 1, in Experiment 2 oocytes were denuded at 20 h and those that were mature were enucleated and used for NT; those that had not cast out a polar body at 20 h were cultured for an additional 3 h (20 + 3h) and then evaluated for polar body formation and used for NT, which was conducted as in Experiment 1. Data were analysed by Fisher's exact test. In Experiment 1, 203 oocytes were collected in 46 aspiration sessions. The rate of oocyte maturation to metaphase II was significantly lower for oocytes cultured for 20 h (35/116, 30%), than for those cultured for 24 h (47/80, 59%). However, the rate of blastocyst development was significantly higher for oocytes cultured for 20 h (11/27, 41%) than for 24 h (2/38, 5%). In Experiment 2, 89 oocytes were collected in 18 aspiration sessions. After 20 h of maturation culture, 22 oocytes were mature (25%). After an additional 3 h of culture, 21 additional oocytes had matured. There were no significant differences between the two treatments (20 and 20 + 3h) in reconstruction rates (77%, 17/22, and 90%, 19/21, respectively) or blastocyst rates (24%, 4/17, and 32%, 6/19, respectively). These results indicate that duration of in vitro maturation, or the duration of presence of cumulus cells, influences blastocyst development after somatic cell NT in the horse. This appears to be due to a benefit of using oocytes immediately after they reach metaphase II; if this is ensured as in Experiment 2, the duration of maturation itself had no effect.This work was supported by the American Quarter Horse Foundation, the Link Equine Research Endowment Fund, Texas A&M University, and by Ms. Kit Knotts.
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Choi YH, Seo KS. Correlation among bioimpedance analysis, sonographic and circumferential measurement in assessment of breast cancer-related arm lymphedema. Lymphology 2014; 47:123-133. [PMID: 25420305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
New approaches for assessment of lymphedema using ultrasonography (US) have been introduced recently and are reported to be reliable and simple. Ultrasonography provides detailed information about physical properties of the tissue in addition to volume and size. There have been only limited studies comparing bioimpedance analysis (BIA), US, and circumferential measurement (CM), which is considered a standard measurement. The aim of this study was to determine the relationship between US, BIA, and CM. Twenty-eight patients with lymphedema after breast cancer surgery underwent BIA, US, and CM. Impedance, which reflects the amount of extracellular fluid, was measured with 1 kHz frequency in affected and unaffected arms. Circumferences were measured at 10cm proximal and distal to the elbow and a truncated cone method used to calculate estimated volumes for upper arm and forearm. We found that interlimb forearm subcutis thickness differences measured by US were highly correlated with CM measurements and that interlimb upper arm subcutis thickness differences measured by US were moderately correlated with CM measurements and BIA ratios. However, the interlimb ratio of compressibility measured by US showed no or only weak correlation with impedance measurements and circumferential measurements. Our results also show that compressibility measured by US could not be predicted from BIA or CM measurements despite a high degree of concordance among subcutis thickness measured by US, CM, and BIA.
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Merchant AT, Shrestha D, Chaisson C, Choi YH, Hazlett LJ, Zhang J. Association between Serum Antibodies to Oral Microorganisms and Hyperglycemia in Adults. J Dent Res 2014; 93:752-9. [PMID: 24943202 DOI: 10.1177/0022034514538451] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 05/13/2014] [Indexed: 11/15/2022] Open
Abstract
We conducted a cross-sectional analysis to evaluate the relationship between serum antibody titers against 19 selected oral microorganisms and measures of hyperglycemia in a large, nationally representative data set. The study population consisted of 7,848 participants from the National Health and Nutrition Examination Survey III (1988-1994) who were at least 40 yrs old, with complete serum IgG antibody data against 19 oral microorganisms. The 19 antibody titers were grouped into 4 categories via cluster analysis--orange-red, yellow-orange, orange-blue, and red-green--named to reflect predominant antibody titers against microorganisms in Socransky's classification scheme for oral microbes. Linear regression models weighted for complex survey design were used in which fasting blood glucose, fasting insulin, and HbA1c were outcomes and antibody cluster scores were exposures, adjusting for potential confounders. Higher orange-red cluster scores were associated with increased hyperglycemia, while higher orange-blue cluster scores were related with decreased hyperglycemia. A 1-unit-higher orange-red cluster score was associated with 0.46 mg/dL higher fasting blood glucose (p = .0038), and a 1-unit-higher orange-blue cluster score was associated with 0.34% lower HbA1c (p = .0257). Groups of antibody titers against periodontal microorganisms were associated with hyperglycemia independent of known risk factors.
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Affiliation(s)
- A T Merchant
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, USA
| | - D Shrestha
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, USA
| | - C Chaisson
- Undergraduate Program in Public Health, Arnold School of Public Health, University of South Carolina, Columbia, USA
| | - Y H Choi
- Department of Preventive Dentistry, School of Dentistry, Kyungpook National University, South Korea
| | - L J Hazlett
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, USA
| | - J Zhang
- Department of Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, USA
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Choi YH, Bae JH, Kim YK, Kim HY, Kim SK, Cho BH. Clinical outcome of intentional replantation with preoperative orthodontic extrusion: a retrospective study. Int Endod J 2014; 47:1168-76. [DOI: 10.1111/iej.12268] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 02/08/2014] [Indexed: 12/21/2022]
Affiliation(s)
- Y. H. Choi
- Department of Conservative Dentistry; School of Dentistry; Seoul National University; Seoul Korea
- Department of Conservative Dentistry; Section of Dentistry; Seoul National University Bundang Hospital; Seongnam Korea
| | - J. H. Bae
- Department of Conservative Dentistry; Section of Dentistry; Seoul National University Bundang Hospital; Seongnam Korea
| | - Y. K. Kim
- Department of Oral and Maxillofacial Surgery; Section of Dentistry; Seoul National University Bundang Hospital; Seongnam Korea
| | - H. Y. Kim
- Department of Dental Laboratory Science and Engineering; College of Health Science; Graduate School & BK21+ Program in Public Health Science; Korea University; Seoul Korea
- Department of Public Health Science; Graduate School & BK21+ Program in Public Health Science; Korea University; Seoul Korea
| | - S. K. Kim
- Department of Conservative Dentistry; School of Dentistry, Kyungpook National University; Daegu Korea
| | - B. H. Cho
- Department of Conservative Dentistry; School of Dentistry; Seoul National University and Dental Research Institute; Seoul Korea
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