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Nelson AO, Schmitz L, Paz-Soldan C, Thome KE, Cote TB, Leuthold N, Scotti F, Austin ME, Hyatt A, Osborne T. Robust Avoidance of Edge-Localized Modes alongside Gradient Formation in the Negative Triangularity Tokamak Edge. Phys Rev Lett 2023; 131:195101. [PMID: 38000408 DOI: 10.1103/physrevlett.131.195101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 08/01/2023] [Accepted: 09/26/2023] [Indexed: 11/26/2023]
Abstract
In a series of high performance diverted discharges on DIII-D, we demonstrate that strong negative triangularity (NT) shaping robustly suppresses all edge-localized mode (ELM) activity over a wide range of plasma conditions: ⟨n⟩=0.1-1.5×10^{20} m^{-3}, P_{aux}=0-15 MW, and |B_{t}|=1-2.2 T, corresponding to P_{loss}/P_{LH08}∼8. The full dataset is consistent with the theoretical prediction that magnetic shear in the NT edge inhibits access to ELMing H-mode regimes; all experimental pressure profiles are found to be at or below the infinite-n ballooning stability limit. Our present dataset also features edge pressure gradients in strong NT that are closer to an H-mode than a typical L-mode plasma, supporting the consideration of NT for reactor design.
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Affiliation(s)
- A O Nelson
- Columbia University, New York, New York 10027, USA
| | - L Schmitz
- University of California-Los Angeles, Los Angeles, California 90095, USA
| | - C Paz-Soldan
- Columbia University, New York, New York 10027, USA
| | - K E Thome
- General Atomics, San Diego, California 92186, USA
| | - T B Cote
- General Atomics, San Diego, California 92186, USA
| | - N Leuthold
- Columbia University, New York, New York 10027, USA
| | - F Scotti
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M E Austin
- The University of Texas at Austin, Austin, Texas 78712, USA
| | - A Hyatt
- General Atomics, San Diego, California 92186, USA
| | - T Osborne
- General Atomics, San Diego, California 92186, USA
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Broadbent H, Osborne T, Mareschal D, Kirkham N. Are two cues always better than one? The role of multiple intra-sensory cues compared to multi-cross-sensory cues in children's incidental category learning. Cognition 2020; 199:104202. [PMID: 32087397 DOI: 10.1016/j.cognition.2020.104202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 01/09/2020] [Accepted: 01/22/2020] [Indexed: 10/25/2022]
Abstract
Simultaneous presentation of multisensory cues has been found to facilitate children's learning to a greater extent than unisensory cues (e.g., Broadbent, White, Mareschal, & Kirkham, 2017). Current research into children's multisensory learning, however, does not address whether these findings are due to having multiple cross-sensory cues that enhance stimuli perception or a matter of having multiple cues, regardless of modality, that are informative to category membership. The current study examined the role of multiple cross-sensory cues (e.g., audio-visual) compared to multiple intra-sensory cues (e.g., two visual cues) on children's incidental category learning. On a computerized incidental category learning task, children aged six to ten years (N = 454) were allocated to either a visual-only (V: unisensory), auditory-only (A: unisensory), audio-visual (AV: multisensory), Visual-Visual (VV: multi-cue) or Auditory-Auditory (AA: multi-cue) condition. In children over eight years of age, the availability of two informative cues, regardless of whether they had been presented across two different modalities or within the same modality, was found to be more beneficial to incidental learning than with unisensory cues. In six-year-olds, however, the presence of multiple auditory cues (AA) did not facilitate learning to the same extent as multiple visual cues (VV) or when cues were presented across two different modalities (AV). The findings suggest that multiple sensory cues presented across or within modalities may have differential effects on children's incidental learning across middle childhood, depending on the sensory domain in which they are presented. Implications for the use of multi-cross-sensory and multiple-intra-sensory cues for children's learning across this age range are discussed.
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Affiliation(s)
- H Broadbent
- Royal Holloway, University of London, United Kingdom of Great Britain and Northern Ireland; Centre for Brain and Cognitive Development, Birkbeck University of London, United Kingdom of Great Britain and Northern Ireland.
| | - T Osborne
- Centre for Brain and Cognitive Development, Birkbeck University of London, United Kingdom of Great Britain and Northern Ireland
| | - D Mareschal
- Centre for Brain and Cognitive Development, Birkbeck University of London, United Kingdom of Great Britain and Northern Ireland
| | - N Kirkham
- Centre for Brain and Cognitive Development, Birkbeck University of London, United Kingdom of Great Britain and Northern Ireland
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Shuttleworth LA, Khan MAM, Osborne T, Collins D, Srivastava M, Reynolds OL. A walk on the wild side: gut bacteria fed to mass-reared larvae of Queensland fruit fly [Bactrocera tryoni (Froggatt)] influence development. BMC Biotechnol 2019; 19:95. [PMID: 31847841 PMCID: PMC6918714 DOI: 10.1186/s12896-019-0579-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
BACKGROUND The Queensland fruit fly, Bactrocera tryoni (Froggatt) (Diptera, Tephritidae) is the most significant insect pest of Australian horticulture. Bactrocera tryoni is controlled using a range of tools including the Sterile Insect Technique (SIT). Mass-rearing and irradiation of pupae in SIT can reduce the fitness and quality of the released sterile insects. Studies have also showed reduced microbial gut diversity in domesticated versus wild tephritids. RESULTS Transmission electron microscopy confirmed the presence of the bacterial isolates in the mid-gut of mass-reared larvae, and plate counts from individual larval guts showed increased numbers of bacteria in supplemented larvae. Several developmental and fitness parameters were tested including larval development time (egg-hatch to pupation), pupal weight, emergence, flight ability, sex-ratio, and time to adult eclosion (egg-hatch to adult eclosion). Enterobacter sp. and Asaia sp. shortened larval development time, while this was delayed by Lactobacillus sp., Leuconostoc sp. and a blend of all four bacteria. The mean time from egg hatch to adult eclosion was significantly reduced by Leuconostoc sp. and the blend for males and females, indicating that the individual bacterium and consortium affect flies differently depending on the life stage (larval or pupal). There was no impact of bacterial supplemented larvae on pupal weight, emergence, flight ability, or sex ratio. CONCLUSIONS Our findings show that bacteria fed to the larval stage of B. tryoni can impart fitness advantages, but the selection of probiotic strains (individual or a consortium) is key, as each have varying effects on the host. Bacteria added to the larval diet particularly Leuconostoc sp. and the blend have the capacity to reduce costs and increase the number of flies produced in mass-rearing facilities by reducing time to adult eclosion by 1.3 and 0.8 mean days for males, and 1.2 and 0.8 mean days for females.
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Affiliation(s)
- Lucas Alexander Shuttleworth
- Biosecurity and Food Safety, New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, 2568 Australia
- Present address: NIAB EMR, Department of Pest and Pathogen Ecology, East Malling, Kent, ME19 6BJ UK
| | - Mohammed Abul Monjur Khan
- Biosecurity and Food Safety, New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, 2568 Australia
- Department of Entomology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, 2202 Bangladesh
| | - Terrence Osborne
- Biosecurity and Food Safety, New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, 2568 Australia
| | - Damian Collins
- Biosecurity and Food Safety, New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, 2568 Australia
| | - Mukesh Srivastava
- Biosecurity and Food Safety, New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, 2568 Australia
| | - Olivia Louise Reynolds
- Biosecurity and Food Safety, New South Wales Department of Primary Industries, Elizabeth Macarthur Agricultural Institute, Menangle, 2568 Australia
- Graham Centre for Agricultural Innovation (an alliance between NSW Department of Primary Industries and Charles Sturt University), Wagga Wagga, New South Wales 2650 Australia
- State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, 350002 China
- Present address: cesar Pty Ltd, Parkville, Victoria 3052 Australia
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Roden C, Barrett J, Glennon E, Osborne T, Whitehouse J, Rashid R, Nash E. WS09-6 Dietary practices in adults with cystic fibrosis taking CFTR modulator therapies. J Cyst Fibros 2019. [DOI: 10.1016/s1569-1993(19)30171-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Broadbent HJ, Osborne T, Rea M, Peng A, Mareschal D, Kirkham NZ. Incidental category learning and cognitive load in a multisensory environment across childhood. Dev Psychol 2018; 54:1020-1028. [PMID: 29309181 PMCID: PMC5961402 DOI: 10.1037/dev0000472] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Multisensory information has been shown to facilitate learning (Bahrick & Lickliter, 2000; Broadbent, White, Mareschal, & Kirkham, 2017; Jordan & Baker, 2011; Shams & Seitz, 2008). However, although research has examined the modulating effect of unisensory and multisensory distractors on multisensory processing, the extent to which a concurrent unisensory or multisensory cognitive load task would interfere with or support multisensory learning remains unclear. This study examined the role of concurrent task modality on incidental category learning in 6- to 10-year-olds. Participants were engaged in a multisensory learning task while also performing either a unisensory (visual or auditory only) or multisensory (audiovisual) concurrent task (CT). We found that engaging in an auditory CT led to poorer performance on incidental category learning compared with an audiovisual or visual CT, across groups. In 6-year-olds, category test performance was at chance in the auditory-only CT condition, suggesting auditory concurrent tasks may interfere with learning in younger children, but the addition of visual information may serve to focus attention. These findings provide novel insight into the use of multisensory concurrent information on incidental learning. Implications for the deployment of multisensory learning tasks within education across development and developmental changes in modality dominance and ability to switch flexibly across modalities are discussed.
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Affiliation(s)
- H J Broadbent
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - T Osborne
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - M Rea
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - A Peng
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - D Mareschal
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - N Z Kirkham
- Centre for Brain and Cognitive Development, Birkbeck, University of London
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Zuo GZ, Hu JS, Maingi R, Yang QX, Sun Z, Huang M, Chen Y, Yuan XL, Meng XC, Xu W, Gentile C, Carpe A, Diallo A, Lunsford R, Mansfield D, Osborne T, Tritz K, Li JG. Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device. Rev Sci Instrum 2017; 88:123506. [PMID: 29289198 DOI: 10.1063/1.4997806] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on design and technology improvements for a flowing liquid lithium (FLiLi) limiter inserted into auxiliary heated discharges in the experimental advanced superconducting tokamak device. In order to enhance Li coverage uniformity and erosion resistance, a new liquid Li distributor with homogenous channels was implemented. In addition, two independent electromagnetic pumps and a new horizontal capillary structure contributed to an improvement in the observed Li flow uniformity (from 30% in the previous FLiLi design to >80% in this FLiLi design). To improve limiter surface erosion resistance, hot isostatic press technology was applied, which improved the thermal contact between thin stainless steel protective layers covering the Cu heat sink. The thickness of the stainless steel layer was increased from 0.1 mm to 0.5 mm, which also helped macroscopic erosion resilience. Despite the high auxiliary heating power up to 4.5 MW, no Li bursts were recorded from FLiLi, underscoring the improved performance of this new design.
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Affiliation(s)
- G Z Zuo
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - J S Hu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - R Maingi
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - Q X Yang
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Z Sun
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - M Huang
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - Y Chen
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - X L Yuan
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - X C Meng
- Department of Applied Physics, Hunan University, Changsha 410082, China
| | - W Xu
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
| | - C Gentile
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - A Carpe
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - A Diallo
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - R Lunsford
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - D Mansfield
- Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
| | - T Osborne
- General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA
| | - K Tritz
- Johns Hopkins University, Baltimore, Maryland 21211, USA
| | - J G Li
- Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
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Glennon E, Roden C, Barrett J, Osborne T, Sunsoa H, Rashid R, Whitehouse J, Nash E. 328 Going the distance – patient opinion on an adult CF centre dietetic and diabetes home visit service. J Cyst Fibros 2017. [DOI: 10.1016/s1569-1993(17)30666-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Reynolds OL, Osborne T, Crisp P, Barchia IM. Specialized Pheromone and Lure Application Technology as an Alternative Male Annihilation Technique to Manage Bactrocera tryoni (Diptera: Tephritidae). J Econ Entomol 2016; 109:1254-1260. [PMID: 27018434 DOI: 10.1093/jee/tow023] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 01/27/2016] [Indexed: 06/05/2023]
Abstract
The results of this study suggest that a novel male annihilation technique (specialized pheromone and lure application technology [SPLAT] incorporating cue-lure [CL] plus spinosad) is as effective as industry standard male annihilation controls, and is worth exploring further to manage Bactrocera tryoni (Froggatt) populations. Three lures were evaluated in a contact and feeding bioassay and a cage attractancy trial: 1) SPLAT-CL + spinosad; 2) SPLAT-CL without spinosad; and 3) wick-CL + malathion. In a field attraction trial, lures (1) and (3) were evaluated with a third treatment, caneite blocks-CL + malathion. Lures were weathered for 0, 1, 2, 4, or 8 wk, with an additional weathering treatment of 12 wk included in the field trial. In the contact and feeding bioassay, lures with SPLAT-CL + spinosad were >97% effective at 48 h for up to 2 wk weathering; however, wicks-CL + malathion killed B. tryoni within 2 h of exposure under all weathering periods. In the cage attractancy trial, SPLAT-CL + spinosad was as effective as, or performed better than, wicks-CL + malathion under all weathering treatments. The field study trap catches were similar for SPLAT-CL + spinosad and blocks-CL + malathion, and both had higher trap catches than wicks-CL + malathion at all weathering periods, except week 12. Overall, SPLAT-CL + spinosad compared favorably with current standard techniques for male annihilation and warrants further research. SPLAT-CL + spinosad may be a reduced-risk alternative for wicks-CL + malathion or blocks-CL + malathion for B. tryoni and other CL-responding fruit flies, such as Bactrocera cucurbitae Coquillett, because it contains a reduced-risk insecticide that poses a lower risk to humans and the environment and does not require labor-intensive handling and placement.
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Evans C, Barrett J, Osborne T, Glennon E, Regan A. 260 Motivational interviewing and dietetics – a fresh approach to adherence issues. J Cyst Fibros 2012. [DOI: 10.1016/s1569-1993(12)60429-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Hong SH, Osborne T, Ren L, Briggs J, Mazcko C, Burkett SS, Khanna C. Protein kinase C regulates ezrin-radixin-moesin phosphorylation in canine osteosarcoma cells. Vet Comp Oncol 2010; 9:207-18. [PMID: 21848623 DOI: 10.1111/j.1476-5829.2010.00249.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The development of metastasis is the most significant cause of death for both canine and human patients with osteosarcoma (OS). Ezrin has been associated with tumour progression and metastasis in human, canine and murine OS. Ezrin activation is dynamically regulated by protein kinase C (PKC) during metastatic progression in human and murine OS. To include the dog in the development of therapeutics that target ezrin biology, we characterized four new canine OS cell lines and confirmed the relationship between PKC and ezrin in these cells. Three of four cell lines formed tumours in mice that were histologically consistent with OS. All cell lines were markedly aneuploid and expressed ezrin and PKC. Finally, both ezrin phosphorylation and cell migration were inhibited using a PKC inhibitor. These data suggest that an association between PKC-mediated activation of ezrin and the metastatic phenotype in canine OS cells.
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Affiliation(s)
- S-H Hong
- Tumor and Metastasis Biology Section, Pediatric Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
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11
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Kim JS, Zhao L, Bogatu IN, In Y, Turnbull A, Osborne T, Maraschek M, Comer K. Soft x-ray virtual diagnostics for tokamak simulations. Rev Sci Instrum 2009; 80:113503. [PMID: 19947727 DOI: 10.1063/1.3245344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The numerical toolset, FAR-TECH Virtual Diagnostic Utility, for generating virtual experimental data based on theoretical models and comparing it with experimental data, has been developed for soft x-ray diagnostics on DIII-D. The virtual (or synthetic) soft x-ray signals for a sample DIII-D discharge are compared with the experimental data. The plasma density and temperature radial profiles needed in the soft x-ray signal modeling are obtained from experimental data, i.e., from Thomson scattering and electron cyclotron emission. The virtual soft x-ray diagnostics for the equilibriums have a good agreement with the experimental data. The virtual diagnostics based on an ideal linear instability also agree reasonably well with the experimental data. The agreements are good enough to justify the methodology presented here for utilizing virtual diagnostics for routine comparison of experimental data. The agreements also motivate further detailed simulations with improved physical models such as the nonideal magnetohydrodynamics contributions (resistivity, viscosity, nonaxisymmetric error fields, etc.) and other nonlinear effects, which can be tested by virtual diagnostics with various stability modeling.
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Affiliation(s)
- J S Kim
- FAR-TECH, Inc., 3550 General Atomics Court, Building 15, Suite 155, San Diego, California 92121, USA
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Harris WG, Fisher MM, Cao X, Osborne T, Ellis L. Magnesium-rich minerals in sediment and suspended particulates of South Florida water bodies: implications for turbidity. J Environ Qual 2007; 36:1670-1677. [PMID: 17940267 DOI: 10.2134/jeq2006.0559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Fine sediments in shallow water bodies such as Lake Okeechobee are prone to resuspension. Predominantly inorganic "mud" sediment that covers approximately 670 km2 of the lake has been recognized as a persistent source of turbidity. The objective of this study was to determine if mineral components of sediments in Lake Okeechobee and water conveyances of the northern Everglades also occur as suspended sediment and hence constitute a potential abiotic contributor to turbidity. Sediment samples were collected from nine stations within the lake and eight locations north of Water Conservation Area 2A in the Everglades. Water samples were also collected at selected locations. The silt and clay mineralogy of sediment and suspended particles was determined using X-ray diffraction, thermogravimetry, scanning-electron microscopy, energy-dispersive X-ray elemental microanalysis, and high-resolution transmission-electron microscopy. Clay fractions of the lake sediment contained the Mg silicate minerals sepiolite and palygorskite, along with smectite, dolomite, calcite, and kaolinite. Sediment silt fractions were dominated by carbonates and/or quartz, with smaller amounts of Ca phosphates and sepiolite. Mineralogy of the mud sediment was similar to that reported for geologic phosphate deposits. This suggests that the mud sediment might have accumulated by stream transport of minerals from these deposits. Suspended solids and mud-sediment mineralogy were similar, except that smectite was more abundant in suspended solids. Everglade samples also contained Mg-rich minerals. The small size, low density, and fibrous or platy nature of the prevalent mud sediment minerals make them an abiotic, hydrodynamically sensitive source of persistent turbidity in a shallow lake. Mitigation efforts focused exclusively on P-induced biogeochemical processes do not address the origin or effects of these minerals. Ecological management issues such as turbidity control, P retention, geologic P input, and suitability of dredging are related to mud-sediment properties and provenance.
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Affiliation(s)
- W G Harris
- Soil and Water Science Dep., University of Florida, Gainesville, FL 32611, USA.
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Petersson-Wolfe CS, Leslie KE, Osborne T, McBride BW, Bagg R, Vessie G, Dick P, Duffield TF. Effect of Monensin Delivery Method on Dry Matter Intake, Body Condition Score, and Metabolic Parameters in Transition Dairy Cows. J Dairy Sci 2007; 90:1870-9. [PMID: 17369228 DOI: 10.3168/jds.2006-402] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
An investigation was conducted to compare the effects of the monensin controlled-release capsule, monensin sodium in feed, and a negative control on feed intake and metabolic parameters in a randomized and blinded clinical trial. A total of 136 Holstein cows and heifers were assigned to a negative control group, administered a monensin controlled-release capsule (CRC) or administered 22 mg/kg of dry matter of monensin sodium in the total mixed ration (premix). Cows were enrolled 3 wk prior to expected calving; at this time monensin treatment began. Cows were located at the Elora Dairy Research Centre (Elora, Ontario, Canada). Blood samples were obtained at enrollment, at 1 wk prior to expected calving date, at calving, and at 1 and 2 wk postpartum. Sera from these samples were analyzed for beta-hydroxybutyrate (BHBA), nonesterified fatty acids, glucose, urea, bilirubin, aspartate aminotransferase activity, insulin, and cortisol. Cows were assigned a body condition score upon enrollment and upon completion of the trial. The dry matter intake was measured for all cows for the entire experimental period (12.0, 11.7, and 11.3 kg/d for control, premix, and CRC groups, respectively). However, no differences in dry matter intake between treatment groups were noted. The interaction of experimental group and sampling time was significant for serum concentration of BHBA and urea. Both monensin delivery methods significantly decreased serum BHBA postpartum. Urea concentrations were increased in the postpartum period compared with the prepartum samples. The CRC group had a significant impact on reducing the loss in body condition over the study period. Serum concentrations of all measured metabolic parameters varied over the peripartum period. Calving season, parity, and body condition score at the start of the study period influenced many of the measured metabolic parameters.
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Affiliation(s)
- C S Petersson-Wolfe
- Department of Population Medicine, University of Guelph, Guelph, Ontario, N1G 2W1.
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Torrelles JB, Ellis D, Osborne T, Hoefer A, Orme IM, Chatterjee D, Brennan PJ, Cooper AM. Characterization of virulence, colony morphotype and the glycopeptidolipid of Mycobacterium avium strain 104. Tuberculosis (Edinb) 2003; 82:293-300. [PMID: 12623272 DOI: 10.1054/tube.2002.0373] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
SETTING Members of the Mycobacterium avium complex (MAC) are responsible for mycobacterial disease in children, the aged and in immunocompromised individuals. The complex consists of different species, serovars and morphologic forms that vary in virulence. One isolate of the MAC is currently being sequenced (MAC 104) and was chosen based on its derivation from an AIDS patient and the fact that it could be genetically manipulated. OBJECTIVE MAC 104 was therefore analyzed for virulence, colony morphotype and expression of the glycopeptidolipid (GPL) responsible for serotying differences and the rough to smooth morphological switch. RESULTS The isolate was found to be virulent in the murine model of low-dose aerosol infection in that it could colonize the lung, proliferate within the tissue and disseminate to other organs. MAC 104 expressed a variety of colony morphotypes, the most prevalent of which were smooth opaque, smooth transparent and rough. All three morphotypes could persist in the lung; however, the transparent and rough morphotypes grew more rapidlyinvivo. The rough morphotype was unusual in that it expressed an atypical form of the GPL usually absent from rough morphotypes. CONCLUSION This characterization complements the genome data and confirms that MAC 104 behaves similarly to other MAC isolates.
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Affiliation(s)
- J B Torrelles
- Mycobacteria Research Laboratories, Department of Microbiology, Colorado State University, Fort Collins, CO 80523, USA
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15
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Osborne T. "I want to go home with the doctor.". Fam Med 2001; 33:661-2. [PMID: 11665902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Affiliation(s)
- T Osborne
- Department of Community and Family Health, Dartmouth Medical School, USA.
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Laferrère B, Fried SK, Osborne T, Pi-Sunyer FX. Effect of one morning meal and a bolus of dexamethasone on 24-hour variation of serum leptin levels in humans. Obes Res 2000; 8:481-6. [PMID: 11068953 PMCID: PMC2840615 DOI: 10.1038/oby.2000.60] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE We have previously shown that morning administration of dexamethasone in combination with food induces a doubling of serum leptin levels starting at 7 hours after dexamethasone administration, with a maximum effect at 10 hours, the latest time point that we have studied. However, dexamethasone given in the absence of food had no effect on serum leptin at 10 hours. The present experiment was undertaken to determine the duration of the effect of dexamethasone on 24-hour serum leptin under fasted and fed conditions in humans. RESEARCH METHODS AND PROCEDURES Six healthy non-obese male volunteers were studied under the following four conditions: 1) dexamethasone (2 mg intravenously, given at 0900 hours) with fasting; 2) dexamethasone with food (1,700 kcal, 55% carbohydrate, 15% protein, and 30% fat, given in one meal 2 hours after dexamethasone administration at 1100 hours); 3) saline with food (same meal); 4) saline with fasting. Serum leptin, glucose, insulin, and cortisol were monitored every 30 minutes for 24 hours. RESULTS 1) Under the fasting condition, dexamethasone increased leptin nocturnal secretion between 2100 and 2400 hours. 2) A single meal (1,700 kcal) at 1100 hours increased nocturnal leptin secretion when compared with the fasting condition. The peak increase of leptin was 123% over baseline between 2100 and 2400 hours, 10 to 14 hours after the meal. 3) In the fed + dexamethasone condition, leptin levels increased from baseline starting 8 hours after dexamethasone injection, reached a maximum increase of 260% between 2100 and 2400 hours, then decreased thereafter, remaining elevated compared to baseline for 16 hours. There was a correlation between 24-hour leptin secretion and insulin secretion after a single morning meal. DISCUSSION A single bolus of dexamethasone, given before a single large meal, produces a delayed (6-hour) but long-lasting increase in serum leptin (over 16 hours). Under fasted conditions, dexamethasone does not increase daytime leptin but does increase leptin during the night.
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Affiliation(s)
- B Laferrère
- Obesity Research Center, St. Luke's/Roosevelt Hospital Center, Columbia University, New York, New York 10025, USA.
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Osborne T, Lacy NL, Potter JF, Crabtree BF. The prevalence, composition, and function of ethics committees in nursing facilities: results of a random, national survey of American Health Care Association members. J Am Med Dir Assoc 2000; 1:51-7. [PMID: 12818031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
OBJECTIVES To determine the prevalence, composition, and function of ethics committees in extended care facilities in the United States. DESIGN Descriptive survey by mail. SETTING A 5% random sample (n = 851) of nursing facility members of the American Health Care Association (n = 17,020). Most of these facilities (75%) are intermediate care facilities; the remainder include a varying number of skilled beds. METHODS An eight-item questionnaire was sent to the randomly selected 851 extended care facilities. The questionnaire inquired about the existence of an ethics committee, plans for formation when applicable, composition of the ethics committee, and its function. Survey data was coded and merged with information on facility characteristics that are part of the American Health Care Association's database. RESULTS Of the responding facilities (n = 394), 34% reported the presence of a functioning ethics committee, with an additional 19% indicating definite plans for ethic committee formation. Forty-three percent expressed no interest in establishing an ethics committee, and 4% reported having had an ethics committee sometime in the past. The greatest proportion of committee time was spent in case review (39%) with lesser amounts of time expended in areas of policy formation (27%) and education (27%). Forty percent of the ethics committees performed two or fewer case reviews per year. Nearly all committees included the following disciplines in the membership: nurses (96%), physicians (95%), and social workers (89%). Facility administrators (77%) and clergy (70%) were frequently represented. Very few facilities reported representation by residents (8%) and Certified Nursing Assistants (2%). The Medical Director served as a committee member on 75% of the ethics committees, and in more than one-half of those instances, he/she was the sole physician on the committee. CONCLUSION Ethics committees are currently active in or there are plans for their development in more than 50% of extended care facilities in the U.S. this represents a very significant increase in prevalence during the last decade. This tendency to form ethics committee's may slow considerably in the future. Ethics committees exhibit considerable variability in structure and function.
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Affiliation(s)
- T Osborne
- Department of Internal Medicine, Section of Geriatrics and Gerontology, University of Nebraska Medical Center, Omaha, USA
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Abstract
This paper is an investigation into the philosophy and the history of the social sciences. Some philosophers of the social sciences have suggested that a key feature of the natural sciences is their capacity to create phenomena, and that the social sciences do not meet this criterion. We suggest, to the contrary, that the social sciences can and do create phenomena, in the sense of new ways of describing and acting that have been used to produce all sorts of effects. Like the natural sciences, the social sciences create their phenomena through the procedures that are established to discover them. But the creation of phenomena is a complex, technically difficult and contested process and its success rare. Historically, this argument is developed through a case-study of the development and evolution of public opinion research in the USA and Britain. We argue that by the 1950s public opinion produced a version of the world that had entered 'into the true'. Special attention is given to technical considerations in the development of public opinion research, especially the genealogy of a particular research technology, that of the representative sample. Whilst we are not concerned with demarcation criteria, we argue that there are some important differences between the social and the natural sciences; that the former have a less concentrated 'spatial mix' and a slower 'tempo of creativity'. None the less, in this particular case, the social sciences have played a key role in the creation of opinioned persons and an opinionated society.
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Affiliation(s)
- T Osborne
- Department of Sociology, University of Bristol
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Abstract
The rod-driven, AII amacrine cells in the mammalian retina maintain homologous gap junctions with one another as well as heterologous gap junctions with on-cone bipolar cells. We used background illumination to study whether changes in the adaptational state of the retina affected the permeabilities of these two sets of gap junctions. To access changes in permeability, we injected single AII amacrine cells with the biotinylated tracer, Neurobiotin, and measured the extent of tracer coupling to neighboring AII cells and neighboring cone bipolar cells. We also measured the center-receptive field size of AII cells to assess concomitant changes in electrical coupling. Our results indicate that in well dark-adapted retinas, AII cells form relatively small networks averaging 20 amacrine cells and covering about 75 microns. The size of these networks matched closely to the size of AII cell on-center receptive fields. However, over most of their operating range, AII cells formed dramatically larger networks, averaging 326 amacrine cells, which corresponded to an increased receptive-field size. As the retina was light adapted beyond the operating range of the AII cells, they uncoupled to form networks comparable in size to those seem in well dark-adapted retinas. Our results, then, indicate that the adaptational state of the retina has a profound effect on the extent of electrical coupling between AII amacrine cells. Although we observed light-induced changes in the number of tracer-coupled cone bipolar cells, these appeared to be an epiphenomenon of changes in homologous coupling between AII amacrine cells. Therefore, in contrast to the robust changes in AII-AII coupling produced by background illumination, our data provided no evidence of a light-induced modulation of coupling between AII cells and on-cone bipolar cells.
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Affiliation(s)
- S A Bloomfield
- Department of Ophthalmology, New York University Medical Center, New York 10016, USA
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Abstract
This paper focuses upon the research investigations of the College of General Practitioners in Britain in the 1950s. Beginning with a discussion of Michel Foucault's concept of 'pastoral power', the paper proceeds to analyse the ways in which the College attempted to set up an epidemiological scrutiny of general practices across Britain; from practice by practice observational studies to the first National Morbidity Study. The paper concludes by arguing that the epidemiological paradigm in general practice was beset by particular internal 'limits', and was replaced increasingly from the 1960s by an emphasis upon psychotherapeutic approaches.
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Affiliation(s)
- T Osborne
- Department of Human Sciences, Brunel University, Uxbridge, Middlesex, England
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Cole DJ, Drummond JC, Ruta TS, Ghazal E, Osborne T. HEMODILUTION AND HYPERTENSION INCREASE CEREBRAL HEMORRHAGE FOLLOWING FOCAL CEREBRAL ISCHEMIA IN RATS. Anesth Analg 1990. [DOI: 10.1213/00000539-199002001-00066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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