508 results on '"Park KT"'
Search Results
252. Additional three new species of Anarsia Meyrick (Lepidoptera, Gelechiidae) from Cambodia and Vietnam.
- Author
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Park KT and Bae YS
- Subjects
- Animal Distribution, Animal Structures, Animals, Body Size, Cambodia, Lepidoptera, Organ Size, Vietnam, Moths
- Abstract
Three new species of the genus Anarsia Zeller (Lepidoptera, Gelechiidae) are described: A. huensis Park, sp. nov. from Vietnam, and A. pursatica Park, sp. nov. and A. degeneralis Park, sp. nov. from Cambodia. Images of adults and genitalia for the new species are illustrated. A check list of the known species from both countries is provided.
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- 2017
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253. Probable secondary transmission of antimicrobial-resistant Escherichia coli between people living with and without pets.
- Author
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Chung YS, Park YK, Park YH, and Park KT
- Subjects
- Animals, Disease Reservoirs, Electrophoresis, Gel, Pulsed-Field veterinary, Escherichia coli genetics, Feces microbiology, Humans, Microbial Sensitivity Tests veterinary, Anti-Bacterial Agents pharmacology, Dogs microbiology, Drug Resistance, Bacterial, Escherichia coli drug effects, Escherichia coli isolation & purification, Pets microbiology
- Abstract
Companion animals are considered as one of the reservoirs of antimicrobial-resistant (AR) bacteria that can be cross-transmitted to humans. However, limited information is available on the possibility of AR bacteria originating from companion animals being transmitted secondarily from owners to non-owners sharing the same space. To address this issue, the present study investigated clonal relatedness among AR E. coli isolated from dog owners and non-owners in the same college classroom or household. Anal samples (n=48) were obtained from 14 owners and 34 non-owners; 31 E. coli isolates were collected (nine from owners and 22 from non-owners). Of 31 E. coli, 20 isolates (64.5%) were resistant to at least one antimicrobial, and 16 isolates (51.6%) were determined as multi-drug resistant E. coli. Six isolates (19.4%) harbored integrase genes (five harbored class I integrase gene and one harbored class 2 integrase gene, respectively). Pulsed-field gel electrophoretic analysis identified three different E. coli clonal sets among isolates, indicating that cross-transmission of AR E. coli can easily occur between owners and non-owners. The findings emphasize a potential risk of spread of AR bacteria originating from pets within human communities, once they are transferred to humans. Further studies are needed to evaluate the exact risk and identify the risk factors of secondarily transmission by investigating larger numbers of isolates from pets, their owners and non-owners in a community.
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- 2017
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254. Optimizing health outcomes in young children waiting for liver transplantation requires more than bridging geographical distances.
- Author
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Park KT and Cox K
- Subjects
- Child, Geography, Humans, Time Factors, Liver Transplantation, Waiting Lists
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- 2017
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255. The Abuse Potential of α-Piperidinopropiophenone (PIPP) and α-Piperidinopentiothiophenone (PIVT), Two New Synthetic Cathinones with Piperidine Ring Substituent.
- Author
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Botanas CJ, Yoon SS, de la Peña JB, Dela Peña IJ, Kim M, Woo T, Seo JW, Jang CG, Park KT, Lee YH, Lee YS, Kim HJ, and Cheong JH
- Abstract
A diversity of synthetic cathinones has flooded the recreational drug marketplace worldwide. This variety is often a response to legal control actions for one specific compound (e.g. methcathinone) which has resulted in the emergence of closely related replacement. Based on recent trends, the nitrogen atom is one of the sites in the cathinone molecule being explored by designer type modifications. In this study, we designed and synthesized two new synthetic cathinones, (1) α-piperidinopropiophenone (PIPP) and (2) α-piperidinopentiothiophenone (PIVT), which have piperidine ring substituent on their nitrogen atom. Thereafter, we evaluated whether these two compounds have an abuse potential through the conditioned place preference (CPP) in mice and self-administration (SA) in rats. We also investigated whether the substances can induce locomotor sensitization in mice following 7 days daily injection and challenge. qRT-PCR analyses were conducted to determine their effects on dopamine-related genes in the striatum. PIPP (10 and 30 mg/kg) induced CPP in mice, but not PIVT. However, both synthetic cathinones were not self-administered by the rats and did not induce locomotor sensitization in mice. qRT-PCR analyses showed that PIPP, but not PIVT, reduced dopamine transporter gene expression in the striatum. These data indicate that PIPP, but not PIVT, has rewarding effects, which may be attributed to its ability to affect dopamine transporter gene expression. Altogether, this study suggests that PIPP may have abuse potential. Careful monitoring of this type of cathinone and related drugs are advocated.
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- 2017
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256. Donor Considerations in Fecal Microbiota Transplantation.
- Author
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Barnes D and Park KT
- Subjects
- Donor Selection trends, Dysbiosis therapy, Enterocolitis, Pseudomembranous microbiology, Enterocolitis, Pseudomembranous therapy, Fecal Microbiota Transplantation trends, Gastrointestinal Microbiome, Humans, Randomized Controlled Trials as Topic, Donor Selection methods, Fecal Microbiota Transplantation methods
- Abstract
Purpose of Review: Tremendous acceleration has been made in understanding the gut microbiota in the past decade and, with it, further understanding of the pathologic role of dysbiosis and the use of fecal microbiota transplantation (FMT) as therapy. FMT has been studied in many disease states including the most common indication of Clostridium difficile infection (CDI), though many questions regarding stool donor selection remain., Recent Findings: Though traditionally, one donor has provided stool for one patient, research is underway to explore many donor selection considerations from the use of pooled donor stool to selection of a high diversity donor. It is well-known that dietary intake shapes the gut microbiota and the potential implications of this on FMT donor selection are being explored. Though further high-quality research is needed, optimizing the fecal microbiota inoculum holds great promise.
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- 2017
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257. Phenotypic and genotypic correlates of daptomycin-resistant methicillin-susceptible Staphylococcus aureus clinical isolates.
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Kang KM, Mishra NN, Park KT, Lee GY, Park YH, Bayer AS, and Yang SJ
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- Aminoacyltransferases genetics, Antimicrobial Cationic Peptides pharmacology, Bacterial Proteins genetics, Cell Wall drug effects, Cell Wall metabolism, Drug Resistance, Bacterial, Gene Expression Regulation, Bacterial, Genotype, Humans, Membrane Fluidity drug effects, Microbial Sensitivity Tests, Phenotype, Polymorphism, Single Nucleotide, Staphylococcus aureus genetics, Staphylococcus aureus isolation & purification, Staphylococcus aureus physiology, Anti-Bacterial Agents pharmacology, Daptomycin pharmacology, Methicillin pharmacology, Staphylococcal Infections microbiology, Staphylococcus aureus drug effects
- Abstract
Daptomycin (DAP) has potent activity in vitro and in vivo against both methicillin-susceptible Staphylococcus aureus (MSSA) and methicillin-resistant S. aureus (MRSA) strains. DAP-resistance (DAP-R) in S. aureus has been mainly observed in MRSA strains, and has been linked to single nucleotide polymorphisms (SNPs) within the mprF gene leading to altered cell membrane (CM) phospholipid (PL) profiles, enhanced positive surface charge, and changes in CM fluidity. The current study was designed to delineate whether these same genotypic and phenotypic perturbations are demonstrated in clinically-derived DAP-R MSSA strains. We used three isogenic DAP-susceptible (DAP-S)/DAP-R strainpairs and compared: (i) presence of mprF SNPs, (ii) temporal expression profiles of the two key determinants (mprF and dltABCD) of net positive surface charge, (iii) increased production of mprF-dependent lysinylated-phosphatidylglycerol (L-PG), (iv) positive surface charge assays, and (v) susceptibility to cationic host defense peptides (HDPs) of neutrophil and platelet origins. Similar to prior data in MRSA, DAP-R (vs DAP-S) MSSA strains exhibited hallmark hot-spot SNPs in mprF, enhanced and dysregulated expression of both mprF and dltA, L-PG overproduction, HDP resistance and enhanced positive surface charge profiles. However, in contrast to most DAP-R MRSA strains, there were no changes in CM fluidity seen. Thus, charge repulsion via mprF-and dlt-mediated enhancement of positive surface charge may be the main mechanism to explain DAP-R in MSSA strains.
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- 2017
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258. The abuse potential of two novel synthetic cathinones with modification on the alpha-carbon position, 2-cyclohexyl-2-(methylamino)-1-phenylethanone (MACHP) and 2-(methylamino)-1-phenyloctan-1-one (MAOP), and their effects on dopaminergic activity.
- Author
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Botanas CJ, Yoon SS, de la Peña JB, Dela Peña IJ, Kim M, Woo T, Seo JW, Jang CG, Park KT, Lee YH, Lee YS, Kim HJ, and Cheong JH
- Subjects
- Animals, Conditioning, Psychological drug effects, Dopamine Plasma Membrane Transport Proteins genetics, Male, Mice, Mice, Inbred ICR, Motor Activity drug effects, Rats, Rats, Sprague-Dawley, Reward, Self Administration, Alkaloids pharmacology, Dopaminergic Neurons drug effects, Substance-Related Disorders
- Abstract
The recreational use of synthetic cathinones has dramatically increased in recent years, which is partly due to easy accessibility and ability of synthetic cathinones to exert rewarding effects similar to cocaine and methamphetamine. Many synthetic cathinones have already been scheduled in several countries; however, novel and diverse synthetic cathinones are emerging at an unprecedented rate, often outpacing regulatory processes. Recently, designer modifications of the basic cathinone molecule are usually performed on the alpha-carbon position. In this study, we designed and synthesized two novel synthetic cathinones with substituents on alpha-carbon position, [1] 2-cyclohexyl-2-(methylamino)-1-phenylethanone (MACHP), and [2] 2-(methylamino)-1-phenyloctan-1-one (MAOP). Then, we evaluated their rewarding and reinforcing effects through the conditioned place preference (CPP) in mice and self-administration (SA) test in rats. Locomotor activity was also assessed in mice during daily MACHP or MAOP treatment for 7days and drug challenge. qRT-PCR analyses were conducted to determine their effects on dopamine-related genes in the striatum. MACHP and MAOP produced CPP at 10 and 30mg/kg. In the SA test, MACHP (1mg/kg/infusion), but not MAOP, was self-administered. Both MACHP and MAOP induced locomotor sensitization in mice. qRT-PCR analyses showed that MACHP and MAOP reduced dopamine transporter gene expression in the striatum. These data indicate that MACHP and MAOP may have rewarding properties, which might be attributed to their ability to affect the dopaminergic activity. These findings may be useful in predicting the abuse potential and hasten the regulation of future cathinone entities with similar modifications., (Copyright © 2017 Elsevier Inc. All rights reserved.)
- Published
- 2017
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259. Sulfatides Primarily Exist in the Substantia Nigra Region of Mouse Brain Tissue.
- Author
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Park KT, Shon JC, Kim JE, Park GH, Choi HJ, and Liu KH
- Subjects
- Animals, Hippocampus metabolism, Hypothalamus metabolism, Male, Mice, Organ Specificity, Principal Component Analysis, Tissue Distribution, Spectrometry, Mass, Electrospray Ionization methods, Substantia Nigra metabolism, Sulfoglycosphingolipids metabolism
- Abstract
Lipid distribution in the brain is important for many biological functions and has been associated with some brain diseases. The aim of this study was to investigate lipid distribution in different regions of brain tissue in mice. To this end, substantia nigra (SN), caudate putamen (CPu), hippocampus (Hip), hypothalamus (Hyp), and cortex (Cx) tissues of mice were analyzed using direct infusion nanoelectrospray-ion trap mass spectrometry and multivariate analyses. The SN, CPu, Hip, Hyp, and Cx groups showed clear differences in lipid distribution using principal component analysis and a partial least-squares discriminant analysis score plot, and lipid levels were significantly different in different brain regions. In particular, sulfatides were mainly distributed in the SN region. Our results could be used to help understand the functions and mechanisms of lipids in various brain diseases.
- Published
- 2017
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260. Mixed Infection of Mycobacterium abscessus subsp. abscessus and Mycobacterium tuberculosis in the Lung.
- Author
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Sohn S, Wang S, Shi H, Park S, Lee S, and Park KT
- Abstract
A mixed infection of Mycobacterium abscessus subsp. abscessus (Mab) and Mycobacterium tuberculosis (MTB) in the lung is an unusual clinical manifestation and has not yet been reported. A 61-year-old woman had been treated for Mab lung disease and concomitant pneumonia, and was diagnosed with pulmonary tuberculosis (PTB). Despite both anti-PTB and anti-Mab therapy, her entire left lung was destroyed and collapsed. She underwent left pneumonectomy and received medical therapy. We were able to successfully treat her mixed infection by pneumonectomy followed by inhaled amikacin therapy. To the best of our knowledge, thus far, this is the first description of a mixed Mab and MTB lung infection.
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- 2017
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261. Correction: Phenotype and Function of CD209+ Bovine Blood Dendritic Cells, Monocyte-Derived-Dendritic Cells and Monocyte-Derived Macrophages.
- Author
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Park KT, Elnaggar MM, Abdellrazeq GS, Bannantine JP, Mack V, Fry LM, and Davis WC
- Abstract
[This corrects the article DOI: 10.1371/journal.pone.0165247.].
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- 2017
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262. Mass Spectrometry-Based Metabolomic and Lipidomic Analyses of the Effects of Dietary Platycodon grandiflorum on Liver and Serum of Obese Mice under a High-Fat Diet.
- Author
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Park HM, Park KT, Park EC, Kim SI, Choi MS, Liu KH, and Lee CH
- Subjects
- Alanine Transaminase blood, Animals, Aspartate Aminotransferases blood, Body Weight, Cholesterol blood, Diet, High-Fat, Discriminant Analysis, Disease Models, Animal, Liver metabolism, Male, Mass Spectrometry, Mice, Mice, Inbred C57BL, Mice, Obese, Obesity drug therapy, Biomarkers blood, Lipid Metabolism, Liver drug effects, Metabolomics, Plant Extracts pharmacology, Platycodon chemistry
- Abstract
We aimed to identify metabolites involved in the anti-obesity effects of Platycodon grandiflorum (PG) in high-fat diet (HFD)-fed mice using mass spectrometry (MS)-based metabolomic techniques. C57BL/6J mice were divided into four groups: normal diet (ND)-fed mice, HFD-fed mice, HFD with 1% PG extract-fed mice (HPGL), and HFD with 5% PG extract-fed mice (HPGH). After 8 weeks, the HFD group gained more weight than the ND group, while dietary 5% PG extract attenuated this change. The partial least squares discriminant analysis (PLS-DA) score plots showed a clear distinction between experimental groups in serum and liver markers. We also identified 10 and 32 metabolites in the serum and liver, respectively, as potential biomarkers that could explain the effect of high-dose PG added to HFD-fed mice, which were strongly involved in amino acid metabolism (glycine, serine, threonine, methionine, glutamate, phenylalanine, ornithine, lysine, and tyrosine), TCA cycle (fumarate and succinate), lipid metabolism (linoleic and oleic acid methyl esters, oleamide, and cholesterol), purine/pyrimidine metabolism (uracil and hypoxanthine), carbohydrate metabolism (maltose), and glycerophospholipid metabolism (phosphatidylcholines, phosphatidylethanolamines, lysophosphatidylcholines, and lysophosphatidylethanolamines). We suggest that further studies on these metabolites could help us gain a better understanding of both HFD-induced obesity and the effects of PG., Competing Interests: The authors have declared no conflict of interest.
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- 2017
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263. A novel synthetic cathinone, 2-(methylamino)-1-(naphthalen-2-yl) propan-1-one (BMAPN), produced rewarding effects and altered striatal dopamine-related gene expression in mice.
- Author
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Botanas CJ, Yoon SS, de la Peña JB, Dela Peña IJ, Kim M, Woo T, Seo JW, Jang CG, Park KT, Lee YH, Lee YS, Kim HJ, and Cheong JH
- Subjects
- Alkaloids chemistry, Animals, Dopamine genetics, Dopamine Agents pharmacology, Dose-Response Relationship, Drug, Locomotion drug effects, Magnetic Resonance Imaging, Male, Methamphetamine pharmacology, Mice, Mice, Inbred ICR, Rats, Rats, Sprague-Dawley, Receptors, Dopamine genetics, Receptors, Dopamine metabolism, Self Administration, Tritium, Tyrosine 3-Monooxygenase genetics, Tyrosine 3-Monooxygenase metabolism, Alkaloids pharmacology, Conditioning, Operant drug effects, Corpus Striatum drug effects, Dopamine metabolism, Reward
- Abstract
The recreational use of synthetic cathinones has grown rapidly which prompted concerns from legal authorities and health care providers. However, in response to legislative regulations, synthesis of novel synthetic cathinones by introducing substituents in cathinone molecule has dramatically increased the diversity of these substances. Based on current trends, the aromatic ring is one of the popular sites in cathinone molecule being explored by designer-type modifications. In this study, we designed and synthesized a novel synthetic cathinone, 2-(methylamino)-1-(naphthalen-2-yl) propan-1-one (BMAPN), which has a naphthalene substituent on the aromatic ring. Thereafter, we determined whether BMAPN has rewarding and reinforcing effects through the conditioned place preference (CPP) test in mice and self-administration (SA) paradigm in rats. Locomotor sensitization was also assessed in mice during daily BMAPN treatment for 7days and drug challenge. Furthermore, we investigated the effects on BMAPN on dopamine-related genes in the striatum of mice using quantitative real-time polymerase chain reaction (qRT-PCR). BMAPN induced CPP at 10 and 30mg/kg and was modestly self-administered at 0.3mg/kg/infusion. Repeated BMAPN (30mg/kg) administration also produced locomotor sensitization. qRT-PCR analyses revealed decreased dopamine transporter and increased dopamine receptor D2 gene expression in the striatum of the BMAPN-treated mice. These data indicate that BMAPN has rewarding and reinforcing properties, which might be due to its effects on dopamine-related genes. The present study suggests that these findings may be useful in predicting abuse potential of future cathinone entities with aromatic ring substitutions., (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Published
- 2017
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264. Premedication Use Before Infliximab Administration: A Cross-sectional Analysis.
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Picoraro J, Winberry G, Siegel CA, El-Matary W, Moses J, Grossman A, and Park KT
- Subjects
- Administration, Intravenous, Adolescent, Adult, Child, Cross-Sectional Studies, Female, Humans, Male, Middle Aged, Surveys and Questionnaires, Young Adult, Gastroenterology statistics & numerical data, Gastrointestinal Agents administration & dosage, Inflammatory Bowel Diseases drug therapy, Infliximab administration & dosage, Practice Patterns, Physicians' statistics & numerical data, Premedication statistics & numerical data
- Abstract
Background: Premedications are commonly given to patients with inflammatory bowel disease before intravenous infliximab administration. We aimed to (1) describe practice variability; and (2) determine clinician rationale for premedicating patients with inflammatory bowel disease before infliximab administration., Methods: We developed a cross-sectional electronic survey after comprehensive literature review to assess practice variability and clinician rationale for premedication use before infliximab. An optional postsurvey quiz assessed clinicians' understanding of the available literature. The survey was distributed through members-only NASPGHAN and Crohn's and Colitis Foundation of America (CCFA) listservs and American Gastroenterological Association (AGA) and American College of Gastroenterology (ACG) web-based discussion boards., Results: Three hundred seventy-nine unique respondents with a 93.3% survey completion rate comprised 331 (87%) and 45 (12%) pediatric and adult gastroenterologists. Among numerous options for premedications, acetaminophen (66%) and diphenhydramine (64%) were most often given before each infliximab infusion. Only 20% did not routinely use premedications. There was heterogeneity of premedication use between gastroenterologists within the same clinical practice. Of 328 (87%) respondents who completed the knowledge assessment quiz, only 18% identified the association of diphenhydramine use with increased reaction., Conclusions: There is high interpractice and intrapractice variability for premedication use before infliximab administration. Clinician rationale for premedicating patients seems to be driven by individual preference or group practice habit. Improved knowledge of the evidence may assist in decreasing overuse of premedications, particularly diphenhydramine., Competing Interests: Potential Conflict of Interests Corey Siegel is a consultant for Abbvie, Amgen, Lilly, Janssen, Sandoz, Pfizer, Prometheus, Takeda, UCB. He has received speaking support from American Regent, Abbvie, Janssen, Pfizer, Takeda. Research support from Abbvie, Janssen, Pfizer, Takeda. Wael El-Matary has received honoraria as a pediatric advisory board member for Janssen and Abbvie, and has received research support from Janssen. Jonathan Moses has served on the speaker’s bureau for Abbvie. KT Park has received research support from AbbVie and Janssen, and supported by National Institutes of Health (DK094868) for this research.
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- 2017
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265. The Effect of Limited English Proficiency on Pediatric Hospital Readmissions.
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Ju M, Luna N, and Park KT
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- Adolescent, Age Factors, Child, Child, Preschool, Cohort Studies, Ethnicity, Female, Health Status Disparities, Humans, Male, Retrospective Studies, Risk Factors, Socioeconomic Factors, Statistics as Topic, United States epidemiology, Communication Barriers, Healthcare Disparities ethnology, Hospitals, Pediatric statistics & numerical data, Medical Overuse prevention & control, Medical Overuse statistics & numerical data, Patient Readmission statistics & numerical data
- Abstract
Background: The relationship between limited English proficiency (LEP) and worse pediatric health outcomes is well documented., Objectives: To determine the relationship between LEP status and pediatric hospital readmissions., Methods: We performed a retrospective cohort analysis of children ≤ 18 years old admitted to a tertiary children's hospital from 2008 to 2014. The main exposure was LEP status. Independent variables included sex, age, race/ethnicity, insurance, median household income, surgical/medical status, severity of illness (SOI), the presence of a complex chronic condition, and length of stay. Primary outcome measures were 7- and 30-day readmission., Results: From 67 473 encounters, 7- and 30-day readmission rates were 3.9% and 8.2%, respectively. LEP patients were more likely to be younger, poorer, and Hispanic; have lower SOI; and government-subsidized insurance. Adjusted odds for 7- or 30-day readmission for LEP versus English-proficient (EP) patients were 1.00 (P = .99) and 0.97 (P = .60), respectively. Hispanic ethnicity (adjusted odds ratio [aOR]: 1.26 [P = .002] and 1.14 [P = .02]), greater SOI (aOR: 1.04 [P < .001] and 1.05 [P < .001]), and the presence of a complex chronic condition (aOR: 2.31 [P < .001] and 3.03 [P < .001]) were associated with increased odds of 7- and 30-day readmission, respectively. White LEP patients had increased odds of 7- and 30-day readmission compared with white EP patients (aOR: 1.46 [P = .006] and 1.32 [P = .007]) and the poorest LEP patients had increased odds of 7- and 30-day readmission compared with the poorest EP patients (aOR: 1.77 [P = .04] and 2.00 [P < .001])., Conclusions: This is the first large study evaluating the relationship between LEP and pediatric hospital readmission. There was no increased risk of readmission in LEP patients compared with EP patients., (Copyright © 2017 by the American Academy of Pediatrics.)
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- 2017
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266. The Nirschl procedure versus arthroscopic extensor carpi radialis brevis débridement for lateral epicondylitis.
- Author
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Kwon BC, Kim JY, and Park KT
- Subjects
- Adult, Aged, Chronic Disease, Female, Humans, Male, Middle Aged, Muscle, Skeletal, Retrospective Studies, Surveys and Questionnaires, Treatment Outcome, Arthroscopy, Debridement, Tennis Elbow surgery
- Abstract
Background: The Nirschl technique and arthroscopic débridement are common surgical procedures for chronic lateral elbow tendinopathy. The purpose of this study was to compare outcomes following the use of these techniques to treat chronic lateral elbow tendinopathy., Methods: We retrospectively reviewed 59 elbows of 55 patients who did not improve after conservative treatment. Twenty-nine elbows of 26 patients were treated with the Nirschl procedure (Nirschl group), and 30 elbows of 29 patients were treated with arthroscopic débridement (arthroscopy group). Outcomes were assessed subjectively with the quick Disabilities of the Arm, Shoulder and Hand questionnaire and the visual analog scale (VAS) for pain in 3 domains (overall pain, pain at rest, and pain during hard work) and objectively with pain-free grip strength., Results: The Nirschl and arthroscopy groups showed significant improvements in subjective and objective outcomes at a mean of 28.5 months and 31 months, respectively (P <.05). No significant between-group differences were found in postoperative outcomes, including quick Disabilities of the Arm, Shoulder and Hand questionnaire scores; pain-free grip strength; and VAS scores for overall pain and pain at rest (P > .05). However, a small but significant difference was found in the postoperative VAS score for pain during hard work (1.6 ± 1.3 for Nirschl group vs 2.2 ± 2.0 for arthroscopy group, P = .042)., Conclusions: Both techniques are comparable and highly effective for treating chronic recalcitrant lateral elbow tendinopathy. Although the Nirschl technique provides slightly superior pain relief during hard work, the effect size is very small and the difference does not appear to be clinically important., (Copyright © 2017 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Elsevier Inc. All rights reserved.)
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- 2017
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267. A novel c.563 T>G, p.L189R lamin A/C mutation in identical twins with dilated cardiomyopathy.
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Lee E, Park KT, Kang J, Park H, Park JJ, Oh IY, and Yoon YE
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- Adult, Cardiomyopathy, Dilated diagnosis, Cardiomyopathy, Dilated therapy, DNA Mutational Analysis, Diseases in Twins diagnosis, Diseases in Twins therapy, Echocardiography, Electrocardiography, Genetic Predisposition to Disease, Humans, Magnetic Resonance Imaging, Male, Phenotype, Cardiomyopathy, Dilated genetics, Diseases in Twins genetics, Lamin Type A genetics, Mutation, Missense, Twins, Monozygotic genetics
- Abstract
Competing Interests: No potential conflict of interest relevant to this article was reported.
- Published
- 2017
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268. Predictive Value of Fecal Calprotectin in Pediatric Graft-Versus-Host Disease.
- Author
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Wadhwani SI, Nakayuenyongsuk W, Shinn L, Chase P, Kharbanda S, Bass D, and Park KT
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- Hematopoietic Stem Cell Transplantation adverse effects, Humans, Intestinal Diseases diagnosis, Intestinal Diseases immunology, Risk Factors, Feces chemistry, Graft vs Host Disease diagnosis, Leukocyte L1 Antigen Complex analysis
- Published
- 2016
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269. Spanish and English Language Symposia to Enhance Activation in Pediatric Inflammatory Bowel Disease.
- Author
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Martin M, Garcia M, Christofferson M, Bensen R, Yeh AM, and Park KT
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- Child, Female, Humans, Male, Parents, Peer Group, Pilot Projects, Registries, Inflammatory Bowel Diseases therapy, Language, Patient Education as Topic methods, Patient Participation methods
- Abstract
Objectives: Patient activation is an important consideration for improved health outcomes in the management of chronic diseases. Limited English proficiency among patients and primary care providers has been shown to be a predictor for worse health across disease states. We aimed to determine the baseline patient activation measure (PAM) among Spanish-speaking (SP) and English-speaking (ES) pediatric patients with IBD and parents, and to describe the feasibility and efficacy of a novel peer-group education symposium designed to enhance patient activation as measured with the PAM., Methods: Two separate half-day educational symposia in either Spanish or English were presented and moderated by 2 native SP physicians. Content for each of the presentations were highly standardized and interactive, designed to address each of the activation domains (self-management, collaboration with a health care provider, maintenance of function and prevention of disease exacerbation, and appropriate access to high-quality care). Descriptive statistics were used to describe changes between pre- and postsymposium PAM trends., Results: Eleven primarily SP and 21 ES families participated in their respective symposium. Paired pre- and post-PAM scores were available from 24 pediatric patients with IBD (8 SP, 16 ES) and 41 parents (15 SP, 26 ES). The mean age for SP and ES patients was 11.6 and 12.0 years, and female sex in 80% and 62%, respectively. Paired pre- and post-PAM scores for all participants (n = 65) were analyzed. PAM scores uniformly increased in all 4 groups after the symposia (SP patients 59.1-70.3, P = 0.05; SP parents 69.8-75.2, P = 0.2; ES patients 59.9-64.0, P = 0.08; ES parents 61.9-69.1, P = 0.002), although only the ES-parents group had sufficient sample size (n = 26) to achieve statistical significance. The overall cohort had an aggregate increase from pre-PAM of 62.9 (SD 14.5) to post-PAM of 69.4 (SD 13.9) (<0.001)., Conclusions: We describe a novel peer-group educational symposium presented in Spanish and English languages to increase patient and parent activation in pediatric patients with IBD and their caregiving parents. The use of PAM to assess levels of activation appears to be feasible and effective in these groups., Competing Interests: Conflict of Interests Authors have no conflict of interest to report.
- Published
- 2016
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270. PKCδ knockout mice are protected from para-methoxymethamphetamine-induced mitochondrial stress and associated neurotoxicity in the striatum of mice.
- Author
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Shin EJ, Dang DK, Tran HQ, Nam Y, Jeong JH, Lee YH, Park KT, Lee YS, Jang CG, Hong JS, Nabeshima T, and Kim HC
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- Animals, Apoptosis drug effects, Corpus Striatum metabolism, Cytosol metabolism, Dopamine metabolism, Membrane Potential, Mitochondrial drug effects, Mice, Knockout, Mitochondria metabolism, Neurotoxicity Syndromes metabolism, Protein Kinase C-delta deficiency, Corpus Striatum drug effects, Methamphetamine pharmacology, Mitochondria drug effects, Protein Kinase C-delta metabolism, Stress, Physiological drug effects
- Abstract
Para-methoxymethamphetamine (PMMA) is a para-ring-substituted amphetamine derivative sold worldwide as an illegal psychotropic drug. Although PMMA use has been reported to lead to severe intoxication and even death, little is known about the mechanism(s) by which PMMA exerts its neurotoxic effects. Here we found that PMMA treatment resulted in phosphorylation of protein kinase Cδ (PKCδ) and subsequent mitochondrial translocation of cleaved PKCδ. PMMA-induced oxidative stress was more pronounced in mitochondria than in the cytosol. Moreover, treatment with PMMA consistently resulted in significant reductions in mitochondrial membrane potential, mitochondrial complex I activity, and mitochondrial Mn superoxide dismutase-immunoreactivity. In contrast, PMMA treatment led to a significant increase in intramitochondrial Ca
2+ level. Treatment with PMMA also significantly increased ionized calcium binding adaptor molecule 1 (Iba-1)-labeled microglial activation and upregulated tumor necrosis factor alpha (TNF-α) gene expression. PKCδ knockout attenuated these mitochondrial effects and dampened the neurotoxic effects of PMMA. Importantly, TNF-α knockout mice were significantly protected from PMMA-induced increases in phospho-PKCδ expression, mitochondrial translocation of cleaved PKCδ, and Iba-1-labeled microgliosis. Both rottlerin, a pharmacological inhibitor of PKCδ, and etanercept, a pharmacological inhibitor of TNF-α, significantly protected against PMMA-mediated induction of apoptosis, as assessed by terminal deoxynucleotidyl transferase dUDP nick end labeling (TUNEL) assays. In addition, PKCδ knockout and TNF-α knockout both resulted in decreased PMMA-mediated induction of dopaminergic loss. Therefore, our results suggest that PKCδ mediates PMMA-induced neurotoxicity by facilitating oxidative stress (mitochondria > cytosol), mitochondrial dysfunction, microglial activation, and pro-apoptotic signaling. Our results also indicate that PMMA-induced PKCδ activation requires the proinflammatory cytokine TNF-α., (Copyright © 2016. Published by Elsevier Ltd.)- Published
- 2016
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271. Complete chloroplast genome of Clematis fusca var. coreana (Ranunculaceae).
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Park KT and Park S
- Subjects
- Base Composition genetics, Chloroplasts genetics, Genes, Plant genetics, Genome Size genetics, Genome, Plant genetics, Phylogeny, RNA, Transfer genetics, Republic of Korea, Sequence Analysis, DNA methods, Clematis genetics, Genome, Chloroplast genetics, Ranunculaceae genetics
- Abstract
The complete chloroplast (cp) genome sequence of Clematis fusca var. coreana, an endemic plant in Korea, was determined. The genome size is 159,609 bp in length, with 38% GC content. A pair of inverted repeats (IRs) of 31,039 bp is separated by a large single copy (LSC) and a small single copy (SSC) of 79,478 bp and 18,053 bp, respectively. The complete cp genome contains 112 unique genes, including 79 coding genes, 4 rRNA genes, and 29 tRNA genes.
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- 2016
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272. Anchoring Bias as a Limiting Factor in High-Value Care: A Case of Fever of Unknown Origin in a Hospitalized Child.
- Author
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Festa N, Park KT, and Schwenk H
- Subjects
- Child, Preschool, Female, Fever of Unknown Origin etiology, Hospitalization, Humans, Clinical Decision-Making, Unnecessary Procedures
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- 2016
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273. Phenotype and Function of CD209+ Bovine Blood Dendritic Cells, Monocyte-Derived-Dendritic Cells and Monocyte-Derived Macrophages.
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Park KT, ElNaggar MM, Abdellrazeq GS, Bannantine JP, Mack V, Fry LM, and Davis WC
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- Animals, Antibodies, Monoclonal immunology, Antigens, CD metabolism, Artiodactyla immunology, Artiodactyla metabolism, Cattle, Cell Adhesion Molecules immunology, Cell Differentiation, Cells, Cultured, Dendritic Cells cytology, Granulocyte-Macrophage Colony-Stimulating Factor pharmacology, Interleukin-4 pharmacology, Lectins, C-Type immunology, Leukocytes, Mononuclear cytology, Leukocytes, Mononuclear metabolism, Macrophages cytology, Male, Monocytes drug effects, Phenotype, Receptors, Cell Surface immunology, Swine, Cell Adhesion Molecules metabolism, Dendritic Cells metabolism, Lectins, C-Type metabolism, Macrophages metabolism, Monocytes cytology, Receptors, Cell Surface metabolism
- Abstract
Phylogenic comparisons of the mononuclear phagocyte system (MPS) of humans and mice demonstrate phenotypic divergence of dendritic cell (DC) subsets that play similar roles in innate and adaptive immunity. Although differing in phenotype, DC can be classified into four groups according to ontogeny and function: conventional DC (cDC1 and cDC2), plasmacytoid DC (pDC), and monocyte derived DC (MoDC). DC of Artiodactyla (pigs and ruminants) can also be sub-classified using this system, allowing direct functional and phenotypic comparison of MoDC and other DC subsets trafficking in blood (bDC). Because of the high volume of blood collections required to study DC, cattle offer the best opportunity to further our understanding of bDC and MoDC function in an outbred large animal species. As reported here, phenotyping DC using a monoclonal antibody (mAb) to CD209 revealed CD209 is expressed on the major myeloid population of DC present in blood and MoDC, providing a phenotypic link between these two subsets. Additionally, the present study demonstrates that CD209 is also expressed on monocyte derived macrophages (MoΦ). Functional analysis revealed each of these populations can take up and process antigens (Ags), present them to CD4 and CD8 T cells, and elicit a T-cell recall response. Thus, bDC, MoDC, and MoΦ pulsed with pathogens or candidate vaccine antigens can be used to study factors that modulate DC-driven T-cell priming and differentiation ex vivo., Competing Interests: The authors have declared that no competing interests exist.
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- 2016
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274. Treatment of CGD-associated Colitis with the IL-23 Blocker Ustekinumab.
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Butte MJ, Park KT, and Lewis DB
- Subjects
- Adolescent, Colitis etiology, Humans, Interleukin-12 antagonists & inhibitors, Interleukin-23 antagonists & inhibitors, Male, Colitis drug therapy, Granulomatous Disease, Chronic complications, Ustekinumab therapeutic use
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- 2016
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275. Genotypic and Phenotypic Characterization of Methicillin-Resistant Staphylococcus aureus Isolated from Bovine Mastitic Milk in Korea.
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Song JW, Yang SJ, Shin S, Seo KS, Park YH, and Park KT
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- Animals, Anti-Bacterial Agents, Cattle, Female, Humans, Mastitis, Bovine, Methicillin, Microbial Sensitivity Tests veterinary, Republic of Korea, Staphylococcal Infections veterinary, Methicillin-Resistant Staphylococcus aureus isolation & purification, Milk microbiology, Staphylococcus aureus isolation & purification
- Abstract
Staphylococcus aureus is a major etiological pathogen for bovine mastitis, foodborne illness, and various clinical infections. Methicillin-resistant S. aureus (MRSA) has been isolated from bovine mastitic milk, and the presence of MRSA in milk is a major public health concern. We investigated the frequency of MRSA isolation from mastitic raw milk in Korea and characterized the patterns of antimicrobial resistance, virulence, and genotypes of the MRSA isolates. A total of 1,222 raw milk samples were collected from 47 dairy farms in Gyeonggi province from 2011 to 2012. Of these samples, 649 were considered mastitic milk based on somatic cell counts of more than 200,000 cells per ml, and 165 S. aureus isolates (from 25.4% of samples) were obtained from these samples. Of these isolates, 23 (13.9%) collected from five farms were confirmed as MRSA by detection of the mecA gene. Disk diffusion and MIC tests for antibiotic resistance revealed that all MRSA isolates were resistant to four or more antimicrobial agents. All MRSA isolates had staphylococcal enterotoxin genes, and two clusters of these genes were identified: seg-sei-sek-sem-sen-seo (20 isolates, 87%) and sed-seg-sei-sej-sem-sen-seo (3 isolates, 13%). Each MRSA-positive farm had only one spa-SCCmec type. Nine MRSA isolates (39.1%) with the t324-IVa genotype, which is related to community-acquired MRSA infection, were isolated from three dairy farms. Additional genotypes of t148-IVa and t002-II were detected and related to human MRSA strains. Most MRSA isolates had distinct pulsed-field gel electrophoresis subtypes, indicating they were not the same clones. Only two isolates collected from the same farm during different years had an identical electrophoresis type, indicating persistence of the clone at this farm. Taken together, these findings may indicate an increased virulence and risk of MRSA strains on dairy farms. Therefore, an efficient surveillance and control program is needed to prevent the transmission of MRSA from animals to humans.
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- 2016
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276. Effect of vaccination with a modified live porcine reproductive and respiratory syndrome virus vaccine on growth performance in fattening pigs under field conditions.
- Author
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Lyoo KS, Choi JY, Hahn TW, Park KT, and Kim HK
- Subjects
- Animals, Female, Swine growth & development, Swine virology, Porcine Reproductive and Respiratory Syndrome prevention & control, Porcine respiratory and reproductive syndrome virus immunology, Vaccines, Live, Unattenuated pharmacology, Viral Vaccines pharmacology
- Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) has caused significant economic losses to the global swine industry. The present study aimed to evaluate the efficacy of a commercial PRRSV modified live virus (MLV) vaccine in conventionally reared growing/finishing pigs. Four barns were designated for groups A, B, C and D in the growing-to-finishing site. All pigs of the A barn were vaccinated with a commercial PRRSV MLV vaccine, whereas pigs of the B, C or D barn as control groups were unvaccinated. Twenty pigs randomly selected and tagged from each barn were serially bled at 0, 20, 40 and 60 day-post-vaccination, and tested for serological response with a commercial enzyme-linked immunosorbent assay kit. Body weights were measured to calculate the average-daily-weight gain (ADG). Serological assays indicated that the seropositivity of the PRRSV-vaccinated group was higher than that of the unvaccinated groups at 40 day-post-vaccination. ADG of group A was significantly higher than that of groups B and C, and the mean weights of groups A, B, C and D were 0.82 ± 0.017, 0.76 ± 0.016, 0.74 ± 0.019 and 0.81 ± 0.018 kg, respectively. In conclusion, the present study reports the serological responses and growth performance parameters by the PRRSV MLV vaccine in growing/finishing pigs under field conditions.
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- 2016
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277. Characterization and use of new monoclonal antibodies to CD11c, CD14, and CD163 to analyze the phenotypic complexity of ruminant monocyte subsets.
- Author
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Elnaggar MM, Abdellrazeq GS, Mack V, Fry LM, Davis WC, and Park KT
- Subjects
- Animals, Antibody Specificity, Cattle, Cross Reactions, Flow Cytometry, Goats, Male, Mice, Sheep, Antibodies, Monoclonal, Murine-Derived immunology, Antigens, CD immunology, Antigens, Differentiation, Myelomonocytic immunology, CD11c Antigen immunology, Lipopolysaccharide Receptors immunology, Monocytes classification, Monocytes immunology, Receptors, Cell Surface immunology, Ruminants blood, Ruminants immunology
- Abstract
The sequencing of the bovine genome and development of mass spectrometry, in conjunction with flow cytometry (FC), have afforded an opportunity to complete the characterization of the specificity of monoclonal antibodies (mAbs), only partially characterized during previous international workshops focused on antibody development for livestock (1991, Leukocyte Antigens in Cattle, Sheep, and Goats; 1993, Leukocyte Antigens of Cattle and Sheep; 1996, Third Workshop on Ruminant Leukocyte Antigens). The objective of this study was to complete the characterization of twelve mAbs incompletely characterized during the workshops that reacted with molecules predominantly expressed on bovine monocytes and use them to provide further information on the phenotypic complexity of monocyte subsets in ruminants. Analysis revealed that the mAbs could be grouped into three clusters that recognize three different molecules: CD11c, CD14, and CD163. Following characterization, comparison of the patterns of expression of CD14 and CD163 with expression of CD16, CD172a, and CD209 revealed the mononuclear cell population is comprised of multiple subsets with differential expression of these molecules. Further analysis revealed the epitopes recognized by mAbs to CD14 and CD163 are conserved on orthologues in sheep and goats. In contrast to CD14 that is also expressed on sheep and goat granulocytes, CD163 is a definitive marker for their monocytes., (Copyright © 2016 Elsevier B.V. All rights reserved.)
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- 2016
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278. Antimicrobial resistance and virulence profiles of Enterococcus spp. isolated from horses in korea.
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Kim DH, Chung YS, Park YK, Yang SJ, Lim SK, Park YH, and Park KT
- Subjects
- Animals, Bacterial Proteins genetics, Biofilms, Cross Infection microbiology, Cross Infection transmission, Drug Resistance, Microbial genetics, Electrophoresis, Gel, Pulsed-Field, Enterococcus enzymology, Enterococcus genetics, Enterococcus faecalis genetics, Feces microbiology, Gelatinases biosynthesis, Gram-Positive Bacterial Infections transmission, Humans, Microbial Sensitivity Tests, Republic of Korea, Virulence genetics, Drug Resistance, Multiple, Bacterial genetics, Enterococcus drug effects, Enterococcus pathogenicity, Horses microbiology
- Abstract
Antimicrobial-resistant (AR) enterococci have emerged as leading nosocomial pathogens. Transmission of AR Enterococci from animals to humans has been demonstrated. However, there is limited information on the transmission of enterococci from horses to humans. To address this issue, we characterized 260 enterococci isolated from horse-associated samples in Korea in 2013 based on their AR profiles and virulence traits. AR profiling revealed an average ratio of AR enterococci of 23.8%. Seven isolates (2.7%) were multidrug-resistant Enterococcus faecalis. Most tetracycline-resistant enterococci harbored either tetM or tetL or both genes; genes conferring resistance to other antimicrobials were detected at low rates. Biofilm formation and gelatinase activity were observed in 51.1% and 47.7% of isolates, respectively; most were E. faecalis harboring the gelE gene. Evidence of transmission of AR enterococci between horses and their environments was provided by pulsed-field gel electrophoresis, and highlights the risk of AR enterococcus transmission to horse riders and handlers through close contact., (Copyright © 2016 Elsevier Ltd. All rights reserved.)
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- 2016
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279. The expression of methiopropamine-induced locomotor sensitization requires dopamine D2, but not D1, receptor activation in the rat.
- Author
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Yoon HS, Cai WT, Lee YH, Park KT, Lee YS, and Kim JH
- Subjects
- Animals, Benzazepines pharmacology, Dose-Response Relationship, Drug, Male, Methamphetamine pharmacology, Motor Activity physiology, Rats, Sprague-Dawley, Salicylamides pharmacology, Central Nervous System Stimulants pharmacology, Dopamine Agents pharmacology, Methamphetamine analogs & derivatives, Motor Activity drug effects, Receptors, Dopamine D1 metabolism, Receptors, Dopamine D2 metabolism, Thiophenes pharmacology
- Abstract
Methiopropamine (MPA) is a structural analog to methamphetamine and is categorized as a novel psychoactive substance that needs to be controlled. However, no study has been performed to determine whether MPA actually develops an addiction-like behavior similar to those arising from other psychomotor stimulants. Thus, we attempted to determine whether MPA produces locomotor sensitization in a manner similar to amphetamine. In the first experiment, rats were pre-exposed to either saline or one of three different doses of MPA (0.2, 1.0, or 5.0mg/kg, IP) with a total of four injections, respectively. After a 2-week withdrawal period, when they were challenged with the same dose of MPA, only the group that was pre-exposed to high dose of MPA (5.0mg/kg) showed sensitized locomotor activity. In the second experiment, all rats were pre-exposed to MPA (5.0mg/kg) only. Interestingly, the expression of MPA-induced locomotor sensitization was inhibited by a pre-injection of a dopamine D2 receptor antagonist, eticlopride (0.05mg/kg, IP), though not by a dopamine D1 receptor antagonist, SCH23390 (0.01mg/kg, IP). These results suggest that repeated injection of MPA in the rat provokes certain neuronal changes involving specific, likely D2, dopamine receptor-mediated pathways that contribute to the expression of MPA-induced locomotor sensitization., (Copyright © 2016 Elsevier B.V. All rights reserved.)
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- 2016
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280. Synthesis of novel flavone derivatives possessing substituted benzamides and their biological evaluation against human cancer cells.
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Yun BH, Lee YH, Park KT, Jung SJ, and Lee YS
- Subjects
- Antineoplastic Agents chemistry, Antineoplastic Agents toxicity, Cell Survival drug effects, Flavanones chemistry, Flavones chemical synthesis, Flavones toxicity, Flavonoids chemistry, Flavonoids toxicity, Hep G2 Cells, Humans, MCF-7 Cells, Neoplasms, Structure-Activity Relationship, Antineoplastic Agents chemical synthesis, Benzamides chemistry, Flavones chemistry
- Abstract
Baicalein is a well-known flavone derivative that possesses diverse biological properties, such as anticancer, antioxidant and anti-inflammatory activities. Numerous baicalein derivatives, including 5,6,7-trimethoxyflavone, have been synthesized with the aim of enhancing its inherent biological activities. In the present work, new flavones, possessing an N-aroylamine-substituent on the B-ring, were synthesized to improve the cytotoxicity of baicalein and 5,6,7-trimethoxyflavone against human cancer cell lines. The majority of the flavones synthesized exhibited greater cytotoxicity than baicalein and 5,6,7-trimethoxyflavone against HepG2 and MCF-7 cells. Among them, compounds 5n, possessing a 3-methoxybenzoylamino group, exhibited great cytotoxic effects on HepG2 (GI50=7.06μM) and MCF-7 (GI50=7.67μM) cells. In contrast, N-aroylamine-substituted 5-hydroxy-6,7-dimethoxyflavone derivatives showed greater cytotoxicity against MCF-7 than HepG2 cells, indicating that the replacement of a 5-methoxy group on the A-ring with a 5-hydroxy group has a marked influence on the cytotoxicity profile., (Copyright © 2016 Elsevier Ltd. All rights reserved.)
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- 2016
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281. Review of Lecithoceridae (Lepidoptera: Gelechioidea) in the Oceanian Region, with description of a new species and a checklist of the family.
- Author
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Park KT, Cho S, and Bae YS
- Subjects
- Animals, Female, Male, Oceania, Species Specificity, Moths anatomy & histology, Moths classification
- Abstract
The Family Lecithoceridae of the Oceanian region, which includes New Guinea (Papua and Papua New Guinea) together with some islands east of Borneo and SW Pacific islands, is reviewed, with a description of Thubana brunalis Park, sp. nov. T. brunalis is the second species of the Torodorinae introduced to the region. Also included a historical review on the taxonomic works on the family in the region, a zoogeographical consideration of the taxa, and a tentative check list of the family, including 158 valid species names. Sphenocrates Meyrick, 1925, syn. nov. is synonymized with Crocanthes Meyrick. New combinations include Pectinimura palpella (Bradley, 1961), comb. nov. and Crocanthes neptis (Diakonoff, 1954), comb. nov.
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- 2016
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282. Pediatric Resident Workload Intensity and Variability.
- Author
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Was A, Blankenburg R, and Park KT
- Subjects
- Internship and Residency statistics & numerical data, Pediatrics, Workload statistics & numerical data
- Abstract
Background: Research on resident workloads has focused primarily on the quantity of hours worked, rather than the content of those hours or the variability among residents. We hypothesize that there are statistically significant variations in resident workloads and better understanding of workload intensity could improve resident education., Methods: The Stanford Children's Health research database was queried for all electronic notes and orders written by pediatric residents from June 2012 to March 2014. The dataset was narrowed to ensure an accurate comparison among residents. A survey was used to determine residents' self-perceived workload intensity. Variability of total notes written and orders entered was analyzed by χ(2) test and a Monte Carlo simulation. Linear regression was used to analyze the correlation between note-writing and order-entry workload intensity., Results: A total of 20 280 notes and 112 214 orders were written by 26 pediatric interns during 6 core rotations between June 2012 and June 2013. Both order-entry and note-writing workload intensity showed highly significant (P < .001) variability among residents. "High workload" residents, defined as the top quartile of total workload intensity, wrote 91% more orders and 19% more notes than "low workload" residents in the bottom quartile. Statistically significant correlation was observed between note-writing and order-entry workload intensity (R(2) = 0.22; P = .02). There was no significant correlation between residents' self-perceived workload intensity and their objective workload., Conclusions: Significant variations in workload exist among pediatric residents. This may contribute to heterogeneous educational opportunities, physician wellness, and quality of patient care., (Copyright © 2016 by the American Academy of Pediatrics.)
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- 2016
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283. Surgical Anatomy of the Longus Colli Muscle and Uncinate Process in the Cervical Spine.
- Author
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Park MS, Moon SH, Kim TH, Oh JK, Kim HJ, Park KT, and Riew KD
- Subjects
- Adult, Aged, Cervical Vertebrae diagnostic imaging, Dissection, Female, Humans, Male, Middle Aged, Neck Muscles diagnostic imaging, Random Allocation, Young Adult, Cervical Vertebrae anatomy & histology, Cervical Vertebrae surgery, Neck Muscles anatomy & histology, Neck Muscles surgery
- Abstract
Purpose: There have been a few previous reports regarding the distances between the medial borders of the longus colli to expose the disc space. However, to our knowledge, there are no reports concerning longus colli dissection to expose the uncinate processes. This study was undertaken to assess the surgical relationship between the longus colli muscle and the uncinate process in the cervical spine., Materials and Methods: This study included 120 Korean patients randomly selected from 333 who had cervical spine MRIs and CTs from January 2003 to October 2013. They consisted of 60 males and 60 females. Each group was subdivided into six groups by age from 20 to 70 years or more. We measured three parameters on MRIs from C3 to T1: left and right longus colli distance and inter-longus colli distance. We also measured three parameters on CT: left and right uncinate distance and inter-uncinate distance., Results: The longus colli distances, uncinate distances, and inter-uncinate distances increased from C3 to T1. The inter-longus colli distances increased from C3 to C7. There was no difference in longus colli distances and uncinate distances between males and females. There was no difference in the six parameters for the different age groups., Conclusion: Although approximate guidelines, we recommend the longus colli be dissected approximately 5 mm at C3-5, 6 mm at C5-6, 7 mm at C6-7, and 8 mm at C7-T1 to expose the uncinate process to its lateral edge.
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- 2016
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284. Anticancer effect of joboksansam, Korean wild ginseng germinated from bird feces.
- Author
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Park JG, Kang WS, Park KT, Park DJ, Aravinthan A, Kim JH, and Cho JY
- Abstract
Background: Joboksansam, Korean bird wild ginseng, is an artificially cultivated wild ginseng germinated from bird feces. Although numerous pharmacologic activities of wild ginsengs have been reported, the beneficial effect of joboksansam in cancer has not been elucidated. In this study, we investigated the in vivo and in vitro anticancer activities of joboksansam powder., Methods: To evaluate the in vivo anticancer activity of joboksansam, we established a xenograft mouse model bearing RMA cell-derived cancer. Direct cytotoxicity induced by joboksansam powder was also investigated in vitro using (3-4-5-dimethylthiazol-2-yl)-2-5-diphenyltetrazolium bromide (MTT) assay. The inhibitory activity of this powder on the activation of cell survival signaling involving Akt and Src was examined with immunoblot analysis., Results: Joboksansam powder displayed strong inhibitory activity against the increased tumor size, increased weight of total body and cancer tissues, and mortality of tumor-bearing mice. Joboksansam powder also suppressed the activation of survival regulatory enzymes Akt and Src, as assessed by phosphorylation levels in the immunoblot analysis of tumor tissues. Interestingly, the viability of RMA cells in vitro was directly decreased by joboksansam treatment., Conclusion: Overall, our results strongly suggest that joboksansam powder has the potential to protect against cancer generation by direct cytotoxic effects on cancer cells resulting from suppression of cell survival signaling.
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- 2016
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285. Isolation and characterization of antimicrobial-resistant Escherichia coli from national horse racetracks and private horse-riding courses in Korea.
- Author
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Chung YS, Song JW, Kim DH, Shin S, Park YK, Yang SJ, Lim SK, Park KT, and Park YH
- Subjects
- Animals, Escherichia coli, Escherichia coli Infections epidemiology, Escherichia coli Infections microbiology, Feces microbiology, Horse Diseases microbiology, Horses, Phylogeny, Prevalence, Republic of Korea epidemiology, Sequence Analysis, DNA veterinary, Anti-Bacterial Agents pharmacology, Drug Resistance, Multiple, Bacterial, Escherichia coli Infections veterinary, Horse Diseases epidemiology
- Abstract
Limited information is available regarding horse-associated antimicrobial resistant (AR) Escherichia (E.) coli. This study was designed to evaluate the frequency and characterize the pattern of AR E. coli from healthy horse-associated samples. A total of 143 E. coli (4.6%) were isolated from 3,078 samples collected from three national racetracks and 14 private horse-riding courses in Korea. Thirty of the E. coli isolates (21%) showed antimicrobial resistance to at least one antimicrobial agent, and four of the AR E. coli (13.3%) were defined as multi-drug resistance. Most of the AR E. coli harbored AR genes corresponding to their antimicrobial resistance phenotypes. Four of the AR E. coli carried class 1 integrase gene (intI1), a gene associated with multi-drug resistance. Pulsed-field gel electrophoretic analysis showed no genetic relatedness among AR E. coli isolated from different facilities; however, cross-transmissions between horses or horses and environments were detected in two facilities. Although cross-transmission of AR E. coli in horses and their environments was generally low, our study suggests a risk of transmission of AR bacteria between horses and humans. Further studies are needed to evaluate the risk of possible transmission of horse-associated AR bacteria to human communities through horse riders and horse-care workers.
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- 2016
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286. Out-of-hospital cardiac arrest patients treated with cardiopulmonary resuscitation using extracorporeal membrane oxygenation: focus on survival rate and neurologic outcome.
- Author
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Lee JJ, Han SJ, Kim HS, Hong KS, Choi HH, Park KT, Seo JY, Lee TH, Kim HC, Kim S, Lee SH, Hwang SM, and Ha SO
- Subjects
- Adult, Aged, Female, Humans, Hypoxia, Brain epidemiology, Hypoxia, Brain etiology, Incidence, Male, Middle Aged, Out-of-Hospital Cardiac Arrest complications, Out-of-Hospital Cardiac Arrest mortality, Republic of Korea epidemiology, Retrospective Studies, Survival Rate trends, Treatment Outcome, Cardiopulmonary Resuscitation methods, Extracorporeal Membrane Oxygenation methods, Hypoxia, Brain prevention & control, Out-of-Hospital Cardiac Arrest therapy
- Abstract
Background: Extracorporeal membrane oxygenation (ECMO) is a useful treatment for refractory out-of-hospital cardiac arrest (OHCA). However, little is known about the predictors of survival and neurologic outcome after ECMO. We analyzed our institution's experience with ECMO for refractory OHCA and evaluated the predictors of survival and neurologic outcome after ECMO., Methods: This was a retrospective review of the medical records of 23 patients who were treated with ECMO due to OHCA that was unresponsive to conventional cardiopulmonary resuscitation, between January 2009 and January 2014., Results: Our ECMO team was activated within 10 min for refractory OHCA, and the 30-day survival rate was 43.5 %. In a multivariate analysis that evaluated independent factors contributing to mortality, urine output ≤ 0.5 mL · kg(-1) · h(-1) (defined as oliguria) during the 24 h after ECMO was statistically significant (OR, 32.271; 95 % CI, 1.379-755.282; p = 0.031). Just after ECMO implantation, 6 of the 9 patients (66.7 %) who had normal findings on brain computed tomography (CT) survived with a cerebral performance category (CPC) of grade 1. However, only 3 of the 11 patients (27 %) who had evidence of hypoxic brain damage on initial brain CT survived (their CPC grade was 4)., Conclusions: Based on our findings, the survival rate can be improved by rapid implantation of ECMO, and oliguria seen during the first 24 h after ECMO may be an independent predictor of mortality. Furthermore, findings on brain CT just after ECMO and subsequent images may represent an important predictor for neurologic outcome after ECMO.
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- 2016
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287. Cost-effectiveness of adalimumab, infliximab or vedolizumab as first-line biological therapy in moderate-to-severe ulcerative colitis.
- Author
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Yokomizo L, Limketkai B, and Park KT
- Abstract
Background: There are no head-to-head randomised controlled trials (RCTs) comparing the effectiveness of biologics in ulcerative colitis (UC). We aimed to assess the cost-effectiveness of adalimumab, infliximab and vedolizumab as first-line agents to induce clinical remission and mucosal healing (MH) in UC., Methods: We constructed a decision tree based on a payer's perspective in the USA to estimate the first year costs of adalimumab, infliximab or vedolizumab to achieve clinical remission and MH in patients with moderate-to-severe UC. Transition probabilities were derived from ACT, ULTRA and GEMINI RCT data. Costs were derived from Medicare reimbursement rates and wholesale drug prices., Results: Assuming a biological-naïve cohort, infliximab 5 mg/kg every 8 weeks was more cost-effective ($99 171 per MH achieved) than adalimumab 40 mg every other week ($316 378 per MH achieved) and vedolizumab every 8 weeks ($301 969 per MH achieved) at 1 year. Non-drug administration cost of infliximab exceeding $1974 per infusion would make adalimumab more cost-effective. First-line UC therapy with vedolizumab would be cost-effective if the drug acquisition price was <$2537 for each 300 mg administration during the 1-year time horizon., Conclusions: If non-drug costs of infliximab administration are not excessive (<$2000), infliximab is the most cost-effective first-line biologic for moderate-to-severe UC. Exceeding this threshold infusion-related cost would make adalimumab the more cost-effective therapy. Considering its drug costs in the USA, vedolizumab appears to be appropriately used as a second-line biologic after antitumour necrosis factor failure.
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- 2016
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288. Infliximab Dosing Strategies and Predicted Trough Exposure in Children With Crohn Disease.
- Author
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Frymoyer A, Piester TL, and Park KT
- Subjects
- Adolescent, Child, Crohn Disease drug therapy, Drug Administration Schedule, Drug Dosage Calculations, Drug Monitoring, Female, Gastrointestinal Agents administration & dosage, Gastrointestinal Agents therapeutic use, Humans, Infliximab administration & dosage, Infliximab therapeutic use, Male, Monte Carlo Method, Randomized Controlled Trials as Topic, Remission Induction, Crohn Disease metabolism, Gastrointestinal Agents pharmacokinetics, Infliximab pharmacokinetics
- Abstract
Objectives: Standard infliximab maintenance dosing of 5 mg/kg every 8 weeks may be inadequate to consistently achieve sufficient drug exposure to minimize loss of response or treatment failure in pediatric Crohn disease (CD). We aimed to determine the predicted infliximab trough concentrations in children with CD during maintenance therapy and the percentage of patients achieving target trough concentration >3 μg/mL., Methods: A Monte Carlo simulation analysis was constructed using a published population pharmacokinetic model based on data from 112 children in the REACH trial. We assessed maintenance dosing strategies of 5, 7.5, and 10 mg/kg at dosing intervals of every 4, 6, and 8 weeks for children that differed by age, weight, albumin level, and concomitant immunomodulator therapy., Results: Based on the index case of a 10-year-old with CD receiving standard infliximab dosing with concomitant immunomodulator therapy, the median (interquartile range) simulated infliximab trough concentration at week 14 was 1.3 (0.5-2.7) μg/mL and 2.4 (1.0-4.8) μg/mL for albumin levels of 3 and 4 g/dL, respectively. Among 1000 simulated children in the model, trough concentration >3 μg/mL at week 14 was achieved 21% and 41% of the time for albumin levels of 3 and 4 g/dL, respectively., Conclusions: Standard infliximab maintenance dosing in children with CD is predicted to frequently result in inadequate exposure, especially when albumin levels are low. Optimized dosing strategies for individual patients are needed to achieve sufficient drug exposure during infliximab maintenance therapy.
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- 2016
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289. Effect of the a circuit training program using obstacles on the walking and balance abilities of stroke patients.
- Author
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Park KT and Kim HJ
- Abstract
[Purpose] The aim of this study was to investigate the impact of a circuit training program on the walking and balance abilities of stroke patients using an up-to-date walking analysis device. [Subjects and Methods] The subjects of this study were 12 adults who were diagnosed with stroke. Evaluation was conducted using the Smart Step test for walking ability; (BBS) for balance ability; and the Timed Up and Go test (TUG) for functional mobility and movement ability. The 12 stroke patients were randomly recruited and divided into two groups; an experimental group which performed circuit training with obstacles, and a control group which performed flat gait training). [Results] Between-group comparison of the change in the 10-m walking speed found a statistically significant difference between the two groups. Between-group comparison of the changes in BBS and TUG found statistically significant differences between the two groups. [Conclusion] The circuit training program using obstacles had a positive effect on the gait and balance abilities of the stroke patients.
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- 2016
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290. Lipidomic platform for structural identification of skin ceramides with α-hydroxyacyl chains.
- Author
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Wu Z, Shon JC, Lee D, Park KT, Park CS, Lee T, Lee HS, and Liu KH
- Subjects
- Epidermis chemistry, Humans, Ceramides analysis, Skin chemistry, Tandem Mass Spectrometry methods
- Abstract
Skin ceramides are sphingolipids consisting of sphingoid bases, which are linked to fatty acids via an amide bond. Typical fatty acid acyl chains are composed of α-hydroxy fatty acid (A), esterified ω-hydroxy fatty acid (EO), non-hydroxy fatty acid (N), and ω-hydroxy fatty acid (O). We recently established a lipidomic platform to identify skin ceramides with non-hydroxyacyl chains using tandem mass spectrometry. We expanded our study to establish a lipidomic platform to identify skin ceramides with α-hydroxyacyl chains. Tandem mass spectrometry analysis of A-type ceramides using chip-based direct infusion nanoelectrospray-mass spectrometry showed the characteristic fragmentation pattern of both acyl and sphingoid units, which can be applied for structural identification of ceramides. Based on the tandem mass spectrometry fragmentation patterns of A-type ceramides, comprehensive fragmentation schemes were proposed. Our results may be useful for identifying A-type ceramides in the stratum corneum of human skin.
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- 2016
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291. PVP-b-PEO block copolymers for stable aqueous and ethanolic graphene dispersions.
- Author
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Perumal S, Park KT, Lee HM, and Cheong IW
- Abstract
The ability to disperse pristine (unfunctionalized) graphene is important for various applications, coating, nanocomposites, and energy related systems. Herein we report that amphiphilic copolymers of poly(4-vinyl pyridine)-block-poly(ethylene oxide) (PVP-b-PEO) are able to disperse graphene with high concentrations about 2.6mg/mL via sonication and centrifugation. Ethanolic and aqueous highly-ordered pyrolytic graphite (HOPG) dispersions with block copolymers were prepared and they were compared with the dispersions stabilized by P-123 Pluronic® (P123) and poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO) synthesized. Transmission electron microscopy, scanning electron microscopy, atomic force microscopy, X-ray diffraction, Raman and UV-visible spectroscopic studies confirmed that PVP-b-PEO block copolymers are better stabilizers for HOPG graphene than P123 and PS-b-PEO. X-ray photoelectron spectroscopy and force-distance (F-d) curve analyses revealed that the nitrogen of vinyl pyridine plays a vital role in better attractive interaction with surface of graphene sheet. Thermogravimetric analysis showed that larger amount of PVP-b-PEO was adsorbed onto graphene with longer poly(4-vinyl pyridine) (PVP) block length and in aqueous medium, respectively, and which was consistent with electrical conductivity decreases. This study presents the dispersion efficiency of graphene using PVP-b-PEO varies substantially depending on the lengths of their hydrophobic (PVP) domains., (Copyright © 2015 Elsevier Inc. All rights reserved.)
- Published
- 2016
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292. Response to strict and liberalized specific carbohydrate diet in pediatric Crohn's disease.
- Author
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Burgis JC, Nguyen K, Park KT, and Cox K
- Subjects
- Adolescent, Adolescent Development, Anti-Bacterial Agents therapeutic use, Child, Child Development, Combined Modality Therapy, Crohn Disease diagnosis, Crohn Disease drug therapy, Crohn Disease metabolism, Dietary Carbohydrates metabolism, Female, Fermentation, Humans, Immunologic Factors therapeutic use, Male, Remission Induction, Retrospective Studies, Time Factors, Treatment Outcome, Weight Gain, Crohn Disease diet therapy, Diet, Carbohydrate-Restricted, Dietary Carbohydrates adverse effects, Patient Compliance
- Abstract
Aim: To investigate the specific carbohydrate diet (SCD) as nutritional therapy for maintenance of remission in pediatric Crohn's disease (CD)., Methods: Retrospective chart review was conducted in 11 pediatric patients with CD who initiated the SCD as therapy at time of diagnosis or flare. Two groups defined as SCD simple (diet alone, antibiotics or 5-ASA) or SCD with immunomodulators (corticosteroids and/or stable thiopurine dosing) were followed for one year and compared on disease characteristics, laboratory values and anthropometrics., Results: The mean age at start of the SCD was 11.8 ± 3.0 years (range 6.6-17.6 years) with five patients starting the SCD within 5 wk of diagnosis. Three patients maintained a strict SCD diet for the study period and the mean time for liberalization was 7.7 ± 4.0 mo (range 1-12) for the remaining patients. In both groups, hematocrit, albumin and ESR values improved while on strict SCD and appeared stable after liberalization (P-value 0.006, 0.002, 0.002 respectively). The majority of children gained in weight and height percentile while on strict SCD, with small loss in weight percentile documented with liberalization., Conclusion: Disease control may be attainable with the SCD in pediatric CD. Further studies are needed to assess adherence, impact on mucosal healing and growth.
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- 2016
- Full Text
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293. The genus Anarsia in Cambodia and the Northern Vietnam (Lepidoptera, Gelechiidae), with descriptions of ten new species and a catalogue of the genus in the Central-East Asia.
- Author
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Bae YS, Shin YM, Na SM, and Park KT
- Subjects
- Animal Distribution, Animal Structures anatomy & histology, Animal Structures growth & development, Animals, Asia, Central, Body Size, Cambodia, Asia, Eastern, Female, Male, Moths anatomy & histology, Moths growth & development, Organ Size, Vietnam, Moths classification
- Abstract
The genus Anarsia Zeller in Vietnam and Cambodia is reviewed, with 19 species including 10 new species: A. deuterodes Park, sp. nov., Anarsia diversiola Park, sp. nov., A. porthmista Park, sp. nov., A. melanodes Park, sp. nov., A. gryphodes Park, sp. nov., A. campestra Park, sp. nov., A. similicampa Park, sp. nov., A. kepensis Park, sp. nov., A. pusillidia Park, sp. nov., and A. houhunlii Park, sp. nov. Nine previously described species, namely A. tricornis Meyrick, A. choana Park, A. isogona Meyrick, A. paraisogona Meyrick, A. incerta Ueda, A. acerata Meyrick, A. didymopa Meyrick, A. phortica Meyrick, and A. patulella (Walker), are reported for the first time from Vietnam or Cambodia. Anarsia magnibimaculata Li & Zheng, 1998 is newly synonymized with A. bimaculata Ponomarenko, 1989. A tentative check list of the genus in the Central and East Asia (including Indochina, China, Russian Far East, Korea, and Japan) is given.
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- 2016
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294. Health Insurance Paid Costs and Drivers of Costs for Patients With Crohn's Disease in the United States.
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Park KT, Colletti RB, Rubin DT, Sharma BK, Thompson A, and Krueger A
- Subjects
- Adolescent, Adult, Aged, Aged, 80 and over, Child, Child, Preschool, Crohn Disease complications, Female, Hospitalization, Humans, Infant, Infant, Newborn, Male, Middle Aged, Tumor Necrosis Factor-alpha antagonists & inhibitors, United States, Young Adult, Crohn Disease drug therapy, Crohn Disease economics, Health Care Costs, Insurance, Health economics
- Abstract
Objectives: The cost of medical care for Crohn's disease (CD) and comorbidities in the era of biologics is unclear. We examined insurance claims data from US health plans to understand this relationship., Methods: Longitudinal CD patient data and reimbursement information from 11 health plans engaged with Accordant Health Services between 2011 and 2013 were analyzed. The analysis considered data for all CD patients and for the patient subgroup ≤20 years and >20 years of age. Descriptive statistics measured the mean health-plan paid costs per patient, the relative cost contribution of anti-tumor necrosis factor (TNF) agents, and health care costs for 31 specific comorbid conditions among CD patients., Results: Overall, there were 5,090 CD patients (57% women) of which 587 CD patients were ≤20 years of age. The mean health-plan paid cost per member per year was $18,637 (s.d. $32,023) for all CD patients, $22,796 (s.d. $ 41,905) for CD patients ≤20 years, and $18,095 (s.d. $30,065) for patients >20 years of age. Twenty-eight percent of CD patients accounted for 80% of total costs. No differences were found in costs based on gender. Increased health-plan paid costs were significantly correlated with the number of comorbid conditions across all ages. Pharmacy utilization costs account for nearly one-half (45.5%) of the total CD-attributable costs, exceeding inpatient care costs. Anti-TNF agents alone comprised nearly one-third (29.5%) of total costs. Aside from anti-TNF costs, other major categories of expense were as follows: inpatient 23.1%, outpatient hospital setting 15.7%, and MD office 8.2%., Conclusions: Total health-care costs in CD exceed previous estimates, with the majority of costs being allocated to a relatively small subgroup of patients. Pharmacy utilization costs, owing to anti-TNF use, result in increasing total health-care costs and currently exceed costs for inpatient care. Pragmatic strategies to encourage gastroenterologists in the best clinical practice of optimizing anti-TNF use-in particular for younger age patients and those with multiple comorbidities-are necessary to reduce avoidable pharmacy utilization and inpatient care costs.
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- 2016
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295. Taxonomic review of the Genus Deltoplastis Meyrick (Lepidoptera: Lecithoceridae) in China and its neibouring countries, with a world catalogue of the genus.
- Author
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Wang Y, Park KT, and Wang S
- Subjects
- Animal Distribution, Animal Structures anatomy & histology, Animal Structures growth & development, Animals, Body Size, China, Female, India, Male, Moths anatomy & histology, Moths growth & development, Organ Size, Thailand, Vietnam, Moths classification
- Abstract
The genus Deltoplastis Meyrick is reviewed from China and its neibouring countries. Fifteen species are recognized, including nine new species: D. angustifoliacea sp. nov., D. conjugata sp. nov., D. dentata sp. nov., D. curviloba sp. nov., D. gyroflexa sp. nov., D. hippocrepica sp. nov., D. mamillata sp. nov., D. acutiprocessa sp. nov., and D. maehongsonensis sp. nov. The male of D. causidica (Meyrick, 1910) and the female of D. prionaspis Gozmány, 1978 are described for the first time. Deltoplastis causidica (Meyrick, 1910) from China and Thailand, D. gypsopeda Meyrick, 1934 from Thailand and India, D. commatopa Meyrick, 1932 from Vietnam and India, D. lobigera Gozmány from India are newly recorded for each country. Photographs of adults and genitalia are provided, along with a key to the species and a world catalogue of Deltoplastis.
- Published
- 2015
- Full Text
- View/download PDF
296. Detection of airborne viruses using electro-aerodynamic deposition and a field-effect transistor.
- Author
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Park KT, Cho DG, Park JW, Hong S, and Hwang J
- Abstract
We report a technique for the detection of aerosolized viruses. Conventional field-effect-transistor (FET)-based techniques use solution-based processes, thus require antibody binding to the detection region of the FET prior to the supply of the analyte. With the method described here, virus-antibody-bound particles are delivered to the FET during detection; therefore, neither a pre-treatment antibody binding step on the FET channel nor washing process for virus-antibody-binding are necessary. Our method is based on the concept that virus-antibody-bound particles are larger than the virus or antibody alone, and thus have larger charge numbers following aerosol charging. When these particles are charged by negative ions and electro-aerodynamically deposited on a substrate, there exists a location on the substrate where neither lone virus nor antibody particles land, and where only virus-antibody-bound particles are deposited. If this location coincides with the channel of the FET, the resulting variation in the current can be used to indicate the existence of a virus. By aerosolizing a mixed solution of the virus and the antibody, only the virus-antibody-bound particles were transported to the swCNT-FET, and the electric current in the swCNT-FET decreased to 30% of that measured with no deposited particles.
- Published
- 2015
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297. Carbon Dioxide Sequestration by Using a Model Carbonic Anhydrase Complex in Tertiary Amine Medium.
- Author
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Sivanesan D, Choi Y, Lee J, Youn MH, Park KT, Grace AN, Kim HJ, and Jeong SK
- Subjects
- Hydrophobic and Hydrophilic Interactions, Models, Molecular, Molecular Conformation, Amines chemistry, Carbon Dioxide chemistry, Carbon Sequestration, Carbonic Anhydrases metabolism
- Abstract
Globally, the elevation of carbon dioxide (CO2 ) levels due to the anthropogenic effect poses a serious threat to the ecosystem. Hence, it is important to control and/or mitigate the level of CO2 in the atmosphere, which necessitates novel tools. Herein, it is proposed to improve CO2 sequestration by using model complexes based on the enzyme carbonic anhydrase (CA) in aqueous tertiary amine medium. The effect of substituents on the model CA model complexes on CO2 absorption and desorption was determined by using a stopped-flow spectrophotometer to follow pH changes through coupling to pH indicator and a continuous stirred-tank reactor (CSTR). The CO2 hydration rate constants were determined under basic conditions and compound 6, which contained a hydrophilic group, showed the highest absorption or hydration levels of CO2 (2.860×10(3) L mol(-1) s(-1) ). In addition, CSTR results for the absorption and desorption of CO2 suggest that simple model CA complexes could be used in post-combustion processing., (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
- Published
- 2015
- Full Text
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298. MinC/MinD copolymers are not required for Min function.
- Author
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Park KT, Du S, and Lutkenhaus J
- Subjects
- Adenosine Triphosphatases metabolism, Bacterial Proteins genetics, Cell Division, Cytoskeletal Proteins chemistry, Cytoskeletal Proteins genetics, Cytoskeletal Proteins metabolism, Escherichia coli genetics, Escherichia coli ultrastructure, Escherichia coli Proteins genetics, Gene Expression Regulation, Bacterial, Membrane Proteins genetics, Membrane Proteins metabolism, Mutation, Protein Multimerization, Bacterial Proteins chemistry, Bacterial Proteins metabolism, Escherichia coli metabolism, Escherichia coli Proteins chemistry, Escherichia coli Proteins metabolism
- Abstract
In Escherichia coli, precise placement of the cytokinetic Z ring at midcell requires the concerted action of the three Min proteins. MinD activates MinC, an inhibitor of FtsZ, at least in part, by recruiting it to the membrane and targeting it to the Z ring, while MinE stimulates the MinD ATPase inducing an oscillation that directs MinC/MinD activity away from midcell. Recently, MinC and MinD were shown to form copolymers of alternating dimers of MinC and MinD, and it was suggested that these copolymers are the active form of MinC/MinD. Here, we use MinD mutants defective in binding MinC to generate heterodimers with wild-type MinD that are unable to form MinC/MinD copolymers. Similarly, MinC mutants defective in binding to MinD were used to generate heterodimers with wild-type MinC that are unable to form copolymers. Such heterodimers are active and in the case of MinC were shown to mediate spatial regulation of the Z ring demonstrating that MinC/MinD copolymer formation is not required. Our results are consistent with a model in which a membrane anchored MinC/MinD complex is targeted to the Z ring through the conserved carboxy tail of FtsZ leading to breakage of FtsZ filaments., (© 2015 John Wiley & Sons Ltd.)
- Published
- 2015
- Full Text
- View/download PDF
299. Characterization and expression of monoclonal antibody-defined molecules on resting and activated bovine αβ, γδ T and NK cells.
- Author
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Park KT, Seo KS, Godwin NA, Van Wie BJ, Gulbahar MY, Park YH, and Davis WC
- Subjects
- Animals, Antibody Specificity, Antigens, CD metabolism, CD4-Positive T-Lymphocytes immunology, CD8-Positive T-Lymphocytes immunology, Cattle, Dipeptidyl Peptidase 4 metabolism, Interleukin-2 Receptor alpha Subunit metabolism, Killer Cells, Natural cytology, Lymphocyte Activation, Receptors, Antigen, T-Cell, alpha-beta metabolism, Receptors, Antigen, T-Cell, gamma-delta metabolism, Receptors, Cell Surface metabolism, Signaling Lymphocytic Activation Molecule Family Member 1, T-Lymphocyte Subsets cytology, Antibodies, Monoclonal immunology, Killer Cells, Natural immunology, T-Lymphocyte Subsets immunology
- Abstract
Monoclonal antibodies (mAbs) specific for leukocyte differentiation molecules (LDMs) were developed during the past few decades to expand reagents for research in ruminants, pigs, and horses. The specificity of some of the mAb-defined molecules was determined through participation in international workshops. Other molecules identified with mAbs during this time, and more recently with mAbs developed after the workshops, have remained partially characterized. Efforts are now underway to characterize the specificity of these mAbs. As reported here, flow cytometry (FC) was used to screen two sets of hybridomas to determine how many of the hybridomas produce mAbs that detect molecules with up-regulated expression on activated lymphocytes or NK cells. Thirty four hybridomas were identified. Comparison of the patterns of reactivity of the mAbs showed some of the mAbs formed clusters that recognize 5 different molecules. FC showed one cluster recognized CD25. Use of mass spectrometry showed 4 clusters recognized orthologues of CD26, CD50, gp96 and signaling lymphocytic activation molecule family member 9 (SLAMF9). Verification and documentation that CD26, CD50, and SLAMF9 were only up-regulated on activated cells was obtained with PBMC from calves vaccinated with a Mycobacterium avium paratuberculosis mutant, Map-relA. CD26 and CD50 were up-regulated on NK cells, CD4 and CD8 T cells and γδ T cells. SLAMF9 was only up-regulated on CD4, CD8, and γδ T cells. gp96 was detected on granulocytes, monocytes and activated NK cells. Detection was attributable to the binding of gp96 to its receptor CD91., Competing Interests: The authors of this manuscript do not have any commercial or other associations that might pose a conflict of interest for information presented in this manuscript., (Copyright © 2015 Elsevier B.V. All rights reserved.)
- Published
- 2015
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300. Characteristics of the perception for unilateral facial nerve palsy.
- Author
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Mun SJ, Park KT, Kim Y, Park JH, and Kim YH
- Subjects
- Adult, Aged, Facial Paralysis physiopathology, Female, Follow-Up Studies, Humans, Male, Middle Aged, Retrospective Studies, Young Adult, Face physiopathology, Facial Expression, Facial Paralysis psychology
- Abstract
Patients with facial nerve palsy (FNP) are actually evaluated by other people rather than doctors or the patients themselves. This study was performed to investigate the characteristics of the perception of unilateral FNP in Korean people. A questionnaire using photographs of four patients with four different grades (House-Brackmann) of FNP was given to two hundred people with no FNP. Subjects of each gender, ranging from 20 to 69 years of age, participated. The questionnaire, showing facial expressions of resting, smiling, whistling, eye closing, and frowning, consisted of questions concerning the identification and the involved side of FNP, the unnatural areas of the face, and the unnaturalness of the facial expressions. The overall identification rate of FNP was 75.0%. The identification rate increased according to the increase in the grade of the patient's FNP (p < .001). The overall detection rate of the involved side was 54.5%, and that rate decreased with increasing subject age (p < .001). The area of the most unnatural facial expression was reported to be the mouth, followed by the eyes and cheeks. The most unnatural facial expression was also reported to be smiling, followed by eye closing and whistling. There was no difference in the identification rate of FNP according to education level. However, the overall detection rate of the involved side was higher in the high-education group (p < .001). The detection rate for the involved side of FNP was lower than the rate of identification of FNP and was significantly low in the middle-aged/elderly and low-education level groups.
- Published
- 2015
- Full Text
- View/download PDF
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