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Cook RR, Fulcher JA, Tobin NH, Li F, Lee D, Woodward C, Javanbakht M, Brookmeyer R, Shoptaw S, Bolan R, Aldrovandi GM, Gorbach PM. Combined effects of HIV and obesity on the gastrointestinal microbiome of young men who have sex with men. HIV Med 2019; 21:365-377. [PMID: 31883184 DOI: 10.1111/hiv.12838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2019] [Indexed: 01/11/2023]
Abstract
OBJECTIVES The prevalence of obesity is rising among people living with HIV, which may synergistically increase inflammation and the risk of associated diseases. Disruption of gut bacterial communities may be one of the key drivers of this inflammation; however, the combined effects of HIV and obesity on the microbiome have not been explored. METHODS This study included 381 men who have sex with men. Thirty-nine were HIV-positive and obese (H+O+), 143 were HIV-positive and nonobese, 64 were HIV-negative and obese, and 135 were HIV-negative and nonobese. Microbiome composition was assessed by targeted sequencing of the V4 region of the 16S ribosomal RNA (rRNA) gene using rectal swab samples. Inverse probability of treatment-weighted marginal structural models were used to investigate differences in microbial composition between groups while controlling for numerous clinical and behavioural confounders. RESULTS Significant variability in microbial composition was explained by the combination of HIV and obesity, over and above each condition alone (R2 for the marginal contribution of the H+/O+ group = 0.008; P = 0.001). H+O+ participants had the highest ratios of Prevotella to Bacteroides, a pro-inflammatory enterotype that has been described in HIV infection and obesity independently. H+O+ participants had lower levels of Bacteroides and Veillonella than all other groups, suggesting a synergistic effect of HIV and obesity on these genera. CONCLUSIONS Our findings support the hypothesis that HIV and obesity act together to disrupt gut microbial communities, which may help explain higher levels of generalized inflammation among people living with both HIV and obesity.
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Waddle A, LeBourgeois M, Kurth S, Harsh J, Lassonde J, Lee D. The association between slow-wave activity (SWA) and processing speed in toddlers. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.1134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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103
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Bang J, Lee H, Choi H, Lee D, Kim Y, Kim DK. Analysis of the relationship between changes in the auditory brainstem response and prognosis in patients with sudden hearing loss. J Laryngol Otol 2019. [PMID: 31791435 DOI: 10.11735/j.issn.1671-170x.2019.12.b016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
OBJECTIVE To analyse how the auditory brainstem response changes in patients with sudden sensorineural hearing loss. METHOD Data were collected via retrospective medical chart review. RESULTS Forty-three patients were included in this study. The mean latency of auditory brainstem response wave 1 was significantly longer for the affected side than for the unaffected side (p = 0.003). The mean latency of auditory brainstem response wave 1 was significantly shorter, and the mean amplitude of auditory brainstem response wave 1 was significantly larger, in the good response group compared to the poor response group. In forward conditional logistic regression analysis, auditory brainstem response wave 1 latency was an independent predictor of a good response (odds ratio = 34.37, 95 per cent confidence interval = 1.56-757.15, p = 0.025). CONCLUSION In patients with sudden sensorineural hearing loss, the latency of wave 1 of the auditory brainstem response was significantly increased and was related to prognosis.
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Liu H, Lee D, McLean K, Leggett D, Hodgkinson P, Fawcett J, Mott R, Stuart K, Pryor D. OC-047: Australian experience of SBRT in early and advanced stage hepatocellular carcinoma. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(20)30436-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Konsur E, Lee D, Pazheri F. M153 A PREGNANT FEMALE WITH A HISTORY OF RUPTURED OVARIAN CYST AND HEREDITARY ANGIOEDEMA TYPE III. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Oh JY, Lee D. Core-shell structured graphene sphere-silver nanowire hybrid filler embedded polydimethylsiloxane nanocomposites for stretchable conductor. NANOTECHNOLOGY 2019; 30:445706. [PMID: 31357184 DOI: 10.1088/1361-6528/ab36a7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Three-dimensional (3D) core-shell structured graphene-silver nanowire (AgNW) hybrid fillers are prepared through facile spray drying and an optical welding process. The spray drying process enables formation of a core-shell structure with AgNWs attached onto the spherical graphene surface by van der Waals force and surface tension during evaporation. AgNW shell is optically welded for enhanced mechanical stability and interfacial resistance reduction. 3D core-shell structured graphene-AgNW hybrid fillers are partially embedded into polydimethylsiloxane (PDMS) to fabricate highly stretchable and conductive nanocomposites. The electrical conductivity of nanocomposites largely increases up to ∼116 S cm-1 and the electrical properties are well maintained under high stretchability of ∼140% strain with 100 stretching cycles despite small amount of AgNW. These enhancements are attributed to the formation of electrically conducting network by excellent dispersion property of spherical graphene core in PDMS matrix and low contact resistance of AgNW shell. We anticipate that 3D core-shell structured graphene-AgNW/PDMS nanocomposites have great potential for application in various stretchable electronic devices.
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Lee D, Erickson A, Dudley AT, Ryu S. Mechanical stimulation of growth plate chondrocytes: Previous approaches and future directions. EXPERIMENTAL MECHANICS 2019; 59:1261-1274. [PMID: 31787777 PMCID: PMC6884322 DOI: 10.1007/s11340-018-0424-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Growth plate cartilage resides near the ends of long bones and is the primary driver of skeletal growth. During growth, both intrinsically and extrinsically generated mechanical stresses act on chondrocytes in the growth plate. Although the role of mechanical stresses in promoting tissue growth and homeostasis has been strongly demonstrated in articular cartilage of the major skeletal joints, effects of stresses on growth plate cartilage and bone growth are not as well established. Here, we review the literature on mechanobiology in growth plate cartilage at macroscopic and microscopic scales, with particular emphasis on comparison of results obtained using different methodological approaches, as well as from whole animal and in vitro experiments. To answer these questions, macroscopic mechanical stimulators have been developed and applied to study mechanobiology of growth plate cartilage and chondrocytes. However, the previous approaches have tested a limited number of stress conditions, and the mechanobiology of a single chondrocyte has not been well studied due to limitations of the macroscopic mechanical stimulators. We explore how microfluidics devices can overcome these limitations and improve current understanding of growth plate chondrocyte mechanobiology. In particular, microfluidic devices can generate multiple stress conditions in a single platform and enable real-time monitoring of metabolism and cellular behavior using optical microscopy. Systematic characterization of the chondrocytes using microfluidics will enhance our understanding of how to use mechanical stresses to control the bone growth and the properties of tissue-engineered growth plate cartilage.
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Aleem E, Montoya J, Lee D, Finch K, Wai D, Dubois C. A laboratory assay for improved prediction of drug responses in acute myeloid leukaemia cells. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz413.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Motoa G, Carrillo-Martin I, Chamorro-Pareja N, Haehn D, Mendez J, Wadei H, Hodge D, Lee D, Bosch W, Gonzalez-Estrada A. A007 IMPACT OF PENICILLIN ALLERGY LABEL IN LIVER TRANSPLANT RECIPIENTS DURING TRANSPLANT HOSPITALIZATION. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zielen S, Kuna P, Aberer W, Lassmann S, Pfaar O, Klimek L, Wade A, Kluehr K, Raab J, Wessiepe D, Lee D, Kramer M, Gunawardena K, Higenbottam T, Heath M, Skinner M, de Kam P. Strong dose response after immunotherapy with PQ grass using conjunctival provocation testing. World Allergy Organ J 2019; 12:100075. [PMID: 31709029 PMCID: PMC6831906 DOI: 10.1016/j.waojou.2019.100075] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 09/19/2019] [Accepted: 09/24/2019] [Indexed: 12/24/2022] Open
Abstract
Background Pollinex Quattro Grass (PQ Grass) is an effective, well-tolerated, short pre-seasonal subcutaneous immunotherapy to treat seasonal allergic rhinoconjunctivitis (SAR) due to grass pollen. In this Phase II study, 4 cumulative doses of PQ Grass and placebo were evaluated to determine its optimal cumulative dose. Methods Patients with grass pollen-induced SAR were randomised to either a cumulative dose of PQ Grass (5100, 14400, 27600 and 35600 SU) or placebo, administered as 6 weekly subcutaneous injections over 31-41 days (EudraCT number 2017-000333-31). Standardized conjunctival provocation tests (CPT) using grass pollen allergen extract were performed at screening, baseline and post-treatment to determine the total symptom score (TSS) assessed approximately 4 weeks after dosing. Three models were pre-defined (Emax, logistic, and linear in log-dose model) to evaluate a dose response relationship. Results In total, 95.5% of the 447 randomized patients received all 6 injections. A highly statistically significant (p < 0.0001), monotonic dose response was observed for all three pre-specified models. All treatment groups showed a statistically significant decrease from baseline in TSS compared to placebo, with the largest decrease observed after 27600 SU (p < 0.0001). The full course of 6 injections was completed by 95.5% of patients. Treatment-emergent adverse events were similar across PQ Grass groups, and mostly mild and transient in nature. Conclusions PQ Grass demonstrated a strong curvilinear dose response in TSS following CPT without compromising its safety profile.
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Key Words
- ADRs, adverse drug reactions
- AE, adverse events
- AIT, allergen immunotherapy
- ANCOVA, analysis of covariance
- ARC, adverse reaction complexes
- Allergen immunotherapy
- Allergoid
- CIA-CPT, Culture – Independent Assessment of the Conjunctival Provocation Test
- CPT, conjunctival provocation test
- Cumulative dose
- Curvilinear dose response
- EAACI, European Academy of Allergy and Clinical Immunology
- EMA, European Medicine Agency
- FAS, Full Analysis Set
- FEV, forced expiratory volume
- FVC, forced vital capacity
- Grass pollen
- HEP, Histamine Equivalent Potency
- LPS, lipopolysaccharide
- MCP-Mod, Multiple Comparison Procedure and Modelling
- MCT, microcrystalline tyrosine
- MPL, Monophosphoryl Lipid A
- MedDRA, Medical Dictionary for Regulatory Activities
- PPS, Per Protocol Set
- SAEs, serious adverse events
- SAF, safety set
- SAR, seasonal allergic rhinoconjunctivitis
- SD, standard deviation
- SU, standardized units
- TEAEs, treatment-emergent adverse events
- TLR, Toll-like receptor
- TSS, Total Symptom Score
- mFAS, Modified Full Analysis Set
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Patel S, Khan A, Sivaswamy A, Ferreira-Legere L, Austin P, Lee D, Ko D, Tu J, Udell J. DERIVATION OF A MODEL THAT ACCURATELY PREDICTS CARDIOVASCULAR FROM NON-CARDIOVASCULAR CAUSE OF DEATH USING ADMINISTRATIVE HEALTH DATA SOURCES. Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Deras I, Du T, Zhao C, Haseley N, Yazdanparast A, Jiang T, Mentzer A, Purdy A, Crain B, Echegaray C, Lee D, Lee J, Silhavy J, O’Brien K, Vijayaraghavan R, Garcia R, Haigis R, Pawlowski T, Dockter J. Clinical and analytical accuracy of a 523 gene panel next-generation sequencing (NGS) assay on formalin-fixed paraffin-embedded (FFPE) solid tumour samples. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz257.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Angaran P, Dorian P, Ha A, Thavendiranathan P, Tsang W, Leong-Poi H, Woo A, Dias B, Wang X, Austin P, Lee D. P2618Association of left ventricular ejection fraction with mortality and hospitalizations. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Although 2-dimensional echocardiography (2DE) is widely used to measure left ventricular ejection fraction (LVEF), the prognostic value of 2DE-derived LVEF has not been clearly demonstrated in a broad range of patients, including those acutely hospitalized as well as ambulatory patients. In particular, the prognostic value of echocardiographic LVEF has not been demonstrated for cardiovascular and heart failure hospitalizations.
Purpose
To determine if greater degrees of LV dysfunction are associated with progressively increasing risks of death or cardiovascular hospitalizations among patients undergoing echocardiography in hospital or outpatient settings.
Methods
We examined quantitative LVEFs from patient-level echocardiographic reports at 3 large hospital laboratories, which were linked to the Canadian Institute for Health Information hospitalization database and to death registries in Ontario, Canada. LVEF was categorized as <25%, 25–35%, 36–45%, or 46–55% (reference). Analyses were performed using cause-specific hazard competing risk models and stratified by: a) outpatient vs. inpatient echocardiogram, and b) if inpatient study, whether the reason for hospitalization was cardiac or noncardiac in nature.
Results
In the echocardiographic cohort of 27,323 patients (median age 68 [IQR: 58–77], 14,828 women [31.7%]), greater reductions in LVEF were associated with higher rates of all-cause mortality, with adjusted hazard ratios (95% CI) of 1.67 (1.57, 1.77) for LVEF <25%, 1.30 (1.24, 1.36) for LVEF 25–35%, and 1.17 (1.11, 1.23) for LVEF 36–45%, compared to LVEF 46–55% (all p<0.001). The cumulative incidence of cardiovascular death was higher as LVEF progressively worsened (Figure). The rate of heart failure hospitalizations was also increased with hazard ratios of 1.71 (1.59, 1.85) for LVEF <25%, 1.39 (1.31, 1.48) for LVEF 25–35%, and 1.21 (1.13, 1.29) for LVEF 36–45%, compared to LVEF 46–55% (all p<0.001). Cardiovascular hospitalizations were also increased with hazard ratios of 1.35 (1.27, 1.42), 1.21 (1.16, 1.27), and 1.13 (1.07, 1.18) for LVEFs <25%, 25–35%, and 36–45%, respectively (all p<0.001). The risk of mortality and hospitalizations increased comparably with greater reductions in LVEF during both inpatient cardiac or noncardiac admissions (p<0.001).
Cumulative incidence of CV death
Conclusions
Quantitative LVEF assessed by 2DE is potent prognostically and was able to stratify the risk of both death and hospitalization outcomes in a wide range of clinical settings. Patients with reduced LVEF measured on inpatient or outpatient echocardiograms, and even in the context of non-cardiac admission, should be considered an at-risk group in whom quality of care metrics could be evaluated in future studies.
Acknowledgement/Funding
Canadian Institutes of Health Research, Heart and Stroke Foundation, and the Ted Rogers Centre for Heart Research
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Lee D, Pascoe R, White P, Jhala P, Foulcher T, Fuller J. Do subsequent injury rates and injury regions differ between concussion and other injury types in the Australian Football League? J Sci Med Sport 2019. [DOI: 10.1016/j.jsams.2019.08.227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lieberman-Cribbin W, Wolf A, Kaufman A, Lee D, Nicastri D, Flores R, Van Gerwen M. P2.16-01 Risk Factors for Short-Term Post-Operative Events Following Lung Cancer Resection. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.1868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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White P, Jhala P, Pascoe R, Lee D, Fuller J. Are Australian Football League players performing poorer after returning to play following a concussion injury? J Sci Med Sport 2019. [DOI: 10.1016/j.jsams.2019.08.230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Drilon A, Rogers E, Zhai D, Deng W, Zhang X, Lee D, Ung J, Whitten J, Zhang H, Liu J, Hu T, Zhuang H, Lu Y, Huang Z, Graber A, Zimmerman Z, Xin R, Cui J, Subbiah V. TPX-0046 is a novel and potent RET/SRC inhibitor for RET-driven cancers. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz244.068] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Piccoli L, Lee D, Stahlman B, Johnson K. 205 Seasonal Variation in Pediatric Behavioral Health Presentations to a Community Emergency Department. Ann Emerg Med 2019. [DOI: 10.1016/j.annemergmed.2019.08.373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Jang J, Park Y, Lee D, Lee H, Lim J, Yoon SA, Lee H, Ahn J, Jeong S, Shin SS, Yoon M. The polyherbal composition Gyeongshingangjeehwan 18 attenuates glucose intolerance and pancreatic steatosis in C57BL/6J mice on a high-fat diet. JOURNAL OF ETHNOPHARMACOLOGY 2019; 240:111943. [PMID: 31075382 DOI: 10.1016/j.jep.2019.111943] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 05/03/2019] [Accepted: 05/06/2019] [Indexed: 06/09/2023]
Abstract
UNLABELLED Ethnopharmacologic relevance: Gyeongshingangjeehwan 18 (GGEx18) is a polyherbal composition derived from Ephedra sinica Stapf (Ephedraceae), Laminaria japonica Aresch (Laminariaceae), and Rheum palmatum L. (Polygonaceae) that is used as an antiobesity drug in Korean clinics. Its constituents are traditionally known to combat obesity, dyslipidemia, and insulin resistance. OBJECTIVE This study was undertaken to investigate the effects of GGEx18 on glucose metabolism and pancreatic steatosis in obese C57BL/6 J mice fed a high-fat diet (HFD) and to examine the related cellular and molecular mechanisms. MATERIALS AND METHODS The mice were grouped and fed for 13 weeks as follows: 1) low-fat diet, 2) HFD, or 3) HFD supplemented with GGEx18 (500 mg/kg/day). Various factors affecting insulin sensitivity and pancreatic function were then assessed via blood analysis, histology, immunohistochemistry, and real-time polymerase chain reaction. RESULTS GGEx18 treatment of obese mice reduced body weight, total fat, and visceral fat mass. GGEx18 inhibited hyperglycemia and hyperinsulinemia and improved glucose and insulin tolerance. GGEx18 also decreased serum leptin levels and concomitantly increased adiponectin levels. Furthermore, GGEx18-treated mice exhibited reduced pancreatic fat accumulation and normalized insulin-secreting β-cell area. GGEx18 increased pancreatic expression of genes promoting fatty acid β-oxidation (i.e., MCAD and VLCAD), whereas expression levels of lipogenesis-related genes (i.e., PPARγ, SREBP-1c, and FAS) declined. DISCUSSION AND CONCLUSION GGEx18 curtailed impaired glucose metabolism and pancreatic steatosis in our mouse model by regulating pancreatic genes that govern lipid metabolism and improving insulin sensitivity. This composition may benefit patients with impaired glucose tolerance, insulin resistance, and pancreatic dysfunction.
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Joo H, Lee D, Jung H, Lim D. Mediation Analysis On The Association Between Statin Use And Fasting Glucose Level. Atherosclerosis 2019. [DOI: 10.1016/j.atherosclerosis.2019.06.378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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121
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Bhandari B, Bian J, Bilton K, Callahan C, Chaves J, Chen H, Cline D, Cooper RL, Danielson D, Danielson J, Dokania N, Elliott S, Fernandes S, Gardiner S, Garvey G, Gehman V, Giuliani F, Glavin S, Gold M, Grant C, Guardincerri E, Haines T, Higuera A, Ji JY, Kadel R, Kamp N, Karlin A, Ketchum W, Koerner LW, Lee D, Lee K, Liu Q, Locke S, Louis WC, Manalaysay A, Maricic J, Martin E, Martinez MJ, Martynenko S, Mauger C, McGrew C, Medina J, Medina PJ, Mills A, Mills G, Mirabal-Martinez J, Olivier A, Pantic E, Philipbar B, Pitcher C, Radeka V, Ramsey J, Rielage K, Rosen M, Sanchez AR, Shin J, Sinnis G, Smy M, Sondheim W, Stancu I, Sterbenz C, Sun Y, Svoboda R, Taylor C, Teymourian A, Thorn C, Tull CE, Tzanov M, Van de Water RG, Walker D, Walsh N, Wang H, Wang Y, Yanagisawa C, Yarritu A, Yoo J. First Measurement of the Total Neutron Cross Section on Argon between 100 and 800 MeV. PHYSICAL REVIEW LETTERS 2019; 123:042502. [PMID: 31491269 DOI: 10.1103/physrevlett.123.042502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 05/23/2019] [Indexed: 06/10/2023]
Abstract
We report the first measurement of the neutron cross section on argon in the energy range of 100-800 MeV. The measurement was obtained with a 4.3-h exposure of the Mini-CAPTAIN detector to the WNR/LANSCE beam at LANL. The total cross section is measured from the attenuation coefficient of the neutron flux as it traverses the liquid argon volume. A set of 2631 candidate interactions is divided in bins of the neutron kinetic energy calculated from time-of-flight measurements. These interactions are reconstructed with custom-made algorithms specifically designed for the data in a time projection chamber the size of the Mini-CAPTAIN detector. The energy averaged cross section is 0.91±0.10(stat)±0.09(syst) b. A comparison of the measured cross section is made to the GEANT4 and FLUKA event generator packages, where the energy averaged cross sections in this range are 0.60 and 0.68 b, respectively.
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Lee D, Kim JK, Skinner CJ. Within-cluster resampling for multilevel models under informative cluster size. Biometrika 2019. [DOI: 10.1093/biomet/asz035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Summary
A within-cluster resampling method is proposed for fitting a multilevel model in the presence of informative cluster size. Our method is based on the idea of removing the information in the cluster sizes by drawing bootstrap samples which contain a fixed number of observations from each cluster. We then estimate the parameters by maximizing an average, over the bootstrap samples, of a suitable composite loglikelihood. The consistency of the proposed estimator is shown and does not require that the correct model for cluster size is specified. We give an estimator of the covariance matrix of the proposed estimator, and a test for the noninformativeness of the cluster sizes. A simulation study shows, as in Neuhaus & McCulloch (2011), that the standard maximum likelihood estimator exhibits little bias for some regression coefficients. However, for those parameters which exhibit nonnegligible bias, the proposed method is successful in correcting for this bias.
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LEE H, An J, Lee D, Park H. MON-145 THE RELATIONSHIP BETWEEN OSTEOPOROSIS AND THE NUTRITIONAL STATUS REPRESENTED BY NORMALIZED PROTEIN CATABOLIC RATE (nPCR) IN HEMODIALYSIS PATIENTS. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Park Y, Li Y, Choi M, Kim J, Lee D. Novel SN-38 double core-shell micelle formulation, SNB-101, enhanced anti-tumor effect and tolerance. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz155.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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LEE H, An J, Lee D, Park H. MON-146 THE RELATIONSHIP BETWEEN THE DIALYSIS ADEQUACY AS ASSESSED BY UREA KINETIC MODELING (Kt/Vurea) AND OSTEOPOROSIS IN HEMODIALYSIS PATIENTS. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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