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Siachos N, Neary JM, Smith RF, Oikonomou G. Automated dairy cattle lameness detection utilizing the power of artificial intelligence; current status quo and future research opportunities. Vet J 2024; 304:106091. [PMID: 38431128 DOI: 10.1016/j.tvjl.2024.106091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 02/25/2024] [Accepted: 02/27/2024] [Indexed: 03/05/2024]
Abstract
Lameness represents a major welfare and health problem for the dairy industry across all farming systems. Visual mobility scoring, although very useful, is labour-intensive and physically demanding, especially in large dairies, often leading to inconsistencies and inadequate uptake of the practice. Technological and computational advancements of artificial intelligence (AI) have led to the development of numerous automated solutions for livestock monitoring. The objective of this study was to review the automated systems using AI algorithms for lameness detection developed to-date. These systems rely on gait analysis using accelerometers, weighing platforms, acoustic analysis, radar sensors and computer vision technology. The lameness features of interest, the AI techniques used to process the data as well as the ground truth of lameness selected in each case are described. Measures of accuracy regarding correct classification of cows as lame or non-lame varied with most systems being able to classify cows with adequate reliability. Most studies used visual mobility scoring as the ground truth for comparison with only a few studies using the presence of specific foot pathologies. Given the capabilities of AI, and the benefits of early treatment of lameness, longitudinal studies to identify gait abnormalities using automated scores related to the early developmental stages of different foot pathologies are required. Farm-specific optimal thresholds for early intervention should then be identified to ameliorate cow health and welfare but also minimise unnecessary inspections.
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Affiliation(s)
- Nektarios Siachos
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, CH64 7TE, UK.
| | - Joseph M Neary
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, CH64 7TE, UK
| | - Robert F Smith
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, CH64 7TE, UK
| | - Georgios Oikonomou
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, CH64 7TE, UK
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Siachos N, Lennox M, Anagnostopoulos A, Griffiths BE, Neary JM, Smith RF, Oikonomou G. Development and validation of a fully automated 2-dimensional imaging system generating body condition scores for dairy cows using machine learning. J Dairy Sci 2024; 107:2499-2511. [PMID: 37977440 DOI: 10.3168/jds.2023-23894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 10/30/2023] [Indexed: 11/19/2023]
Abstract
Monitoring body condition score (BCS) is a useful management tool to estimate the energy reserves of an individual cow or a group of cows. The aim of this study was to develop and evaluate the performance of a fully automated 2-dimensional imaging system using a machine learning algorithm to generate real-time BCS for dairy cows. Two separate datasets were used for training and testing. The training dataset included 34,150 manual BCS (MAN_BCS) assigned by 5 experienced veterinarians during 35 visits at 7 dairy farms. Ordinal regression methods and deep learning architecture were used when developing the algorithm. Subsequently, the testing dataset was used to evaluate the developed BCS prediction algorithm on 4 of the participating farms. An experienced human assessor (HA1) visited these farms and performed 8 whole-milking-herd BCS sessions. Each farm was visited twice, allowing for 30 d (±2 d) to pass between visits. The MAN_BCS assigned by HA1 were considered the ground truth data. At the end of the validation study, MAN_BCS were merged with the stored automated BCS (AI_BCS), resulting in a testing dataset of 9,657 single BCS. A total of 3,817 cows in the testing dataset were scored twice 30 d (±2 d) apart, and the change in their BCS (ΔBCS) was calculated. A subset of cows at one farm were scored twice on consecutive days to evaluate the within-observer agreement of both the human assessor and the system. The manual BCS of 2 more assessors (HA2 and HA3) were used to assess the interobserver agreement between humans. Finally, we also collected ultrasound measurements of backfat thickness (BFT) from 111 randomly selected cows with available MAN_BCS and AI_BCS. Using the testing dataset, intra- and interobserver agreement for single BCS and ΔBCS were estimated by calculating the simple percentage agreement (PA) at 3 error levels and the weighted kappa (κw) for the exact agreement. A Bland-Altman plot was constructed to visualize the systematic and proportional bias. The association between MAN_BCS and AI_BCS and the BFT was assessed with Passing-Bablok regressions. The system had an almost perfect repeatability with a κw of 0.99. The agreement between MAN_BCS and AI_BCS was substantial, with an overall κw of 0.69. The overall PA at the exact, ± 0.25-unit, and ± 0.50-unit BCS error range between MAN_BCS and AI_BCS was 44.4%, 84.6%, and 94.8%, respectively, and greater than the PA obtained between HA1 and HA3. The Bland-Altman plot revealed a minimal systematic bias of -0.09 with a proportional bias at the extreme scores. Furthermore, despite the low κw of 0.20, the overall PA at the exact and ± 0.25-unit of BCS error range between MAN_BCS and AI_BCS regarding the ΔBCS was 45.7 and 88.2%, respectively. A strong linear relationship was observed between BFT and AI_BCS (ρ = 0.75), although weaker than that between BFT and MAN_BCS (ρ = 0.91). The system was able to predict single BCS and ΔBCS with satisfactory accuracy, comparable to that obtained between trained human scorers.
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Affiliation(s)
- N Siachos
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, CH64 7TE, United Kingdom
| | - M Lennox
- CattleEye Ltd., The Innovation Centre, Queens Road, Belfast BT3 9DT, United Kingdom
| | - A Anagnostopoulos
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, CH64 7TE, United Kingdom
| | - B E Griffiths
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, CH64 7TE, United Kingdom
| | - J M Neary
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, CH64 7TE, United Kingdom
| | - R F Smith
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, CH64 7TE, United Kingdom
| | - G Oikonomou
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, CH64 7TE, United Kingdom.
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Ryder J, Smith RF, Neary JM. Postpartum longissimus dorsi muscle loss, but not back fat, is associated with resumption of postpartum ovarian activity in dairy cattle. J Dairy Sci 2023; 106:8087-8097. [PMID: 37562647 DOI: 10.3168/jds.2023-23253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 05/01/2023] [Indexed: 08/12/2023]
Abstract
The objectives of this observational cohort study were to assess the effect of body condition score change, back fat depth change, and muscle diameter change on the time to commencement of luteal activity and first estrus in commercial pedigree Holstein cows. A total of 140 of 200 commercial pedigree Holstein cows were enrolled in one dairy herd in Somerset, UK, over 52 wk in 2021 to 2022. The herd used 4 automatic milking machines with in-line progesterone measurement capability to determine commencement of luteal activity and time to first estrus. Cows were followed until at least 60 d postpartum, and milk progesterone was measured daily starting from 10 DIM. Body condition scoring and ultrasound measurements of back fat depth and longissimus dorsi muscle diameter were performed on cows twice, within 7 d of both calving and 60 DIM. Other explanatory variables assessed included parity, 60-d and 305-d milk yield, and subclinical ketosis (β-hydroxybutryate ≥1.2 mmol/L). Occurrence of clinical disease <60 DIM was forced into all models as a binary variable. Data were analyzed using multivariable Cox proportionate survival analyses. Muscle loss was associated with commencement of luteal activity and time to first estrus. A reduction in muscle diameter by 1.5 to 5 mm was associated with the shortest time to the start of luteal activity and first estrus. A reduction in muscle diameter >8 mm was associated with the longest times to luteal activity and first estrus. In addition to being affected by muscle loss, commencement of luteal activity was delayed by subclinical ketosis, clinical disease, and failure to gain body condition to 60 DIM. Cows that had a BCS loss of 0.25 or more between calving and 60 DIM were at least 52 ± 22% less likely to have commenced luteal activity compared with those that gained BCS. Interestingly, cows that had no change in body condition score commenced luteal activity later than those that gained body condition score. Muscle loss was associated with time to first estrus irrespective of clinical disease status. Cows that lost >8 mm of muscle diameter showed estrus behavior later than cows that lost 1.5 to 5 mm. In conclusion, our findings indicate that extensive muscle loss postpartum was associated with a delayed start to luteal activity and first estrus, irrespective of body condition change, clinical disease, and subclinical ketosis. Marginal muscle loss and a gain in body condition, however, were associated with an earlier start to luteal activity and first estrus.
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Affiliation(s)
- J Ryder
- Garston Veterinary Group, Garston House, Portway, Frome, BA11 1PZ, UK
| | - R F Smith
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Neston, CH64 7TE, UK
| | - J M Neary
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Neston, CH64 7TE, UK.
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Anagnostopoulos A, Griffiths BE, Siachos N, Neary J, Smith RF, Oikonomou G. Initial validation of an intelligent video surveillance system for automatic detection of dairy cattle lameness. Front Vet Sci 2023; 10:1111057. [PMID: 37383350 PMCID: PMC10299827 DOI: 10.3389/fvets.2023.1111057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 05/25/2023] [Indexed: 06/30/2023] Open
Abstract
Introduction Lameness is a major welfare challenge facing the dairy industry worldwide. Monitoring herd lameness prevalence, and early detection and therapeutic intervention are important aspects of lameness control in dairy herds. The objective of this study was to evaluate the performance of a commercially available video surveillance system for automatic detection of dairy cattle lameness (CattleEye Ltd). Methods This was achieved by first measuring mobility score agreement between CattleEye and two veterinarians (Assessor 1 and Assessor 2), and second, by investigating the ability of the CattleEye system to detect cows with potentially painful foot lesions. We analysed 6,040 mobility scores collected from three dairy farms. Inter-rate agreement was estimated by calculating percentage agreement (PA), Cohen's kappa (κ) and Gwet's agreement coefficient (AC). Data regarding the presence of foot lesions were also available for a subset of this dataset. The ability of the system to predict the presence of potentially painful foot lesions was tested against that of Assessor 1 by calculating measures of accuracy, using lesion records during the foot trimming sessions as reference. Results In general, inter-rater agreement between CattleEye and either human assessor was strong and similar to that between the human assessors, with PA and AC being consistently above 80% and 0.80, respectively. Kappa agreement between CattleEye and the human scorers was in line with previous studies (investigating agreement between human assessors) and within the fair to moderate agreement range. The system was more sensitive than Assessor 1 in identifying cows with potentially painful lesions, with 0.52 sensitivity and 0.81 specificity compared to the Assessor's 0.29 and 0.89 respectively. Discussion This pilot study showed that the CattleEye system achieved scores comparable to that of two experienced veterinarians and was more sensitive than a trained veterinarian in detecting painful foot lesions.
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Gong X, Polsin DN, Paul R, Henderson BJ, Eggert JH, Coppari F, Smith RF, Rygg JR, Collins GW. X-Ray Diffraction of Ramp-Compressed Silicon to 390 GPa. Phys Rev Lett 2023; 130:076101. [PMID: 36867795 DOI: 10.1103/physrevlett.130.076101] [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: 06/10/2022] [Revised: 11/15/2022] [Accepted: 01/19/2023] [Indexed: 06/18/2023]
Abstract
Silicon (Si) exhibits a rich collection of phase transitions under ambient-temperature isothermal and shock compression. This report describes in situ diffraction measurements of ramp-compressed Si between 40 and 389 GPa. Angle-dispersive x-ray scattering reveals that Si assumes an hexagonal close-packed (hcp) structure between 40 and 93 GPa and, at higher pressure, a face-centered cubic structure that persists to at least 389 GPa, the highest pressure for which the crystal structure of Si has been investigated. The range of hcp stability extends to higher pressures and temperatures than predicted by theory.
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Affiliation(s)
- X Gong
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627-0132, USA
| | - D N Polsin
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627-0132, USA
| | - R Paul
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627-0132, USA
| | - B J Henderson
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627-0171, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94550-9234, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94550-9234, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94550-9234, USA
| | - J R Rygg
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627-0132, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627-0171, USA
| | - G W Collins
- University of Rochester Laboratory for Laser Energetics, Rochester, New York 14623-1299, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627-0132, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627-0171, USA
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Neary JM, Bedford C, Smith RF. End‐of‐life decision‐making of dairy cattle and calves: A survey of British farmers and veterinary surgeons. Vet Rec Open 2022; 9:e51. [DOI: 10.1002/vro2.51] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 09/29/2022] [Accepted: 11/02/2022] [Indexed: 11/27/2022] Open
Affiliation(s)
- Joseph M. Neary
- Department of Livestock and One Health Institute of Infection, Veterinary and Ecological Sciences Leahurst Campus, University of Liverpool Neston UK
| | - Cherry Bedford
- Department of Livestock and One Health Institute of Infection, Veterinary and Ecological Sciences Leahurst Campus, University of Liverpool Neston UK
| | - Robert F. Smith
- Department of Livestock and One Health Institute of Infection, Veterinary and Ecological Sciences Leahurst Campus, University of Liverpool Neston UK
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Kim D, Smith RF, Ocampo IK, Coppari F, Marshall MC, Ginnane MK, Wicks JK, Tracy SJ, Millot M, Lazicki A, Rygg JR, Eggert JH, Duffy TS. Structure and density of silicon carbide to 1.5 TPa and implications for extrasolar planets. Nat Commun 2022; 13:2260. [PMID: 35477934 PMCID: PMC9046200 DOI: 10.1038/s41467-022-29762-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 03/16/2022] [Indexed: 11/10/2022] Open
Abstract
There has been considerable recent interest in the high-pressure behavior of silicon carbide, a potential major constituent of carbon-rich exoplanets. In this work, the atomic-level structure of SiC was determined through in situ X-ray diffraction under laser-driven ramp compression up to 1.5 TPa; stresses more than seven times greater than previous static and shock data. Here we show that the B1-type structure persists over this stress range and we have constrained its equation of state (EOS). Using this data we have determined the first experimentally based mass-radius curves for a hypothetical pure SiC planet. Interior structure models are constructed for planets consisting of a SiC-rich mantle and iron-rich core. Carbide planets are found to be ~10% less dense than corresponding terrestrial planets.
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Affiliation(s)
- D Kim
- Department of Geosciences, Princeton University, Princeton, NJ, USA.
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - I K Ocampo
- Department of Geosciences, Princeton University, Princeton, NJ, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - M C Marshall
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - M K Ginnane
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J K Wicks
- Department of Earth & Planetary Sciences, Johns Hopkins University, Baltimore, MD, USA
| | - S J Tracy
- Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, USA
| | - M Millot
- Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - A Lazicki
- Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - J R Rygg
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - T S Duffy
- Department of Geosciences, Princeton University, Princeton, NJ, USA
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Rieck L, Carson C, Hawley RJ, Heller M, Paul M, Scoggins M, Zimmerman M, Smith RF. Phase II MS4 challenges: moving toward effective stormwater management for small municipalities. Urban Ecosyst 2021. [DOI: 10.1007/s11252-021-01179-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AbstractFederal regulations for municipal separate storm sewer systems (MS4s) in the United States have been in place since 1990 as part of the Nation Pollutant Discharge Elimination System (NPDES), aiming to reduce sediment and pollutant loads originating from urban areas. However, small-municipality (Phase II) MS4s frequently grapple with several challenges, resulting in a lack of stakeholder buy-in and actionable stormwater management plans. We identify five common challenges concerning MS4 requirements based on literature review, professional experience, and feedback solicited from stakeholders, municipal managers, and fellow professionals and offer real-world examples of efficient, effective MS4 frameworks and/or solutions. The five challenges are summarized as beliefs that: (1) agricultural land use is the largest pollutant contributor and the root cause of pollution problems; (2) stormwater management only benefits downstream communities; (3) large, expensive projects are required to comply with regulations; (4) maintenance, monitoring, and inspection of best management practices (BMPs) is overwhelmingly complex and expensive; and (5) a lack of direct funding makes complying with regulations an impossible task. These challenges are universal in nature for Phase II MS4 permittees and can create real barriers for effective stormwater management. However, we found many examples of methods or techniques to effectively address these five specific challenges, making them well-suited and important for discussion. BMPs can create tangible improvements for surrounding communities (e.g., reduced streambank erosion and flooding), and improved understanding of the structure and options within the MS4 program will help small municipalities make informed choices about management plans.
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Marshall MC, Millot M, Fratanduono DE, Sterbentz DM, Myint PC, Belof JL, Kim YJ, Coppari F, Ali SJ, Eggert JH, Smith RF, McNaney JM. Metastability of Liquid Water Freezing into Ice VII under Dynamic Compression. Phys Rev Lett 2021; 127:135701. [PMID: 34623849 DOI: 10.1103/physrevlett.127.135701] [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: 03/05/2021] [Revised: 07/23/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
The ubiquitous nature and unusual properties of water have motivated many studies on its metastability under temperature- or pressure-induced phase transformations. Here, nanosecond compression by a high-power laser is used to create the nonequilibrium conditions where liquid water persists well into the stable region of ice VII. Through our experiments, as well as a complementary theoretical-computational analysis based on classical nucleation theory, we report that the metastability limit of liquid water under nearly isentropic compression from ambient conditions is at least 8 GPa, higher than the 7 GPa previously reported for lower loading rates.
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Affiliation(s)
- M C Marshall
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Laboratory for Laser Energetics, Rochester, New York 14623, USA
| | - M Millot
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D M Sterbentz
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
- Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616, USA
| | - P C Myint
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J L Belof
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Y-J Kim
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S J Ali
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J M McNaney
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Kraus RG, Coppari F, Fratanduono DE, Smith RF, Lazicki A, Wehrenberg C, Eggert JH, Rygg JR, Collins GW. Melting of Tantalum at Multimegabar Pressures on the Nanosecond Timescale. Phys Rev Lett 2021; 126:255701. [PMID: 34241515 DOI: 10.1103/physrevlett.126.255701] [Citation(s) in RCA: 2] [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] [Received: 02/12/2021] [Accepted: 05/05/2021] [Indexed: 06/13/2023]
Abstract
Tantalum was once thought to be the canonical bcc metal, but is now predicted to transition to the Pnma phase at the high pressures and temperatures expected along the principal Hugoniot. Furthermore, there remains a significant discrepancy between a number of static diamond anvil cell experiments and gas gun experiments in the measured melt temperatures at high pressures. Our in situ x-ray diffraction experiments on shock compressed tantalum show that it does not transition to the Pnma phase or other candidate phases at high pressure. We observe incipient melting at approximately 254±15 GPa and complete melting by 317±10 GPa. These transition pressures from the nanosecond experiments presented here are consistent with what can be inferred from microsecond gas gun sound velocity measurements. Furthermore, the observation of a coexistence region on the Hugoniot implies the lack of significant kinetically controlled deviation from equilibrium behavior. Consequently, we find that kinetics of phase transitions cannot be used to explain the discrepancy between static and dynamic measurements of the tantalum melt curve. Using available high pressure thermodynamic data for tantalum and our measurements of the incipient and complete melting transition pressures, we are able to infer a melting temperature 8070_{-750}^{+1250} K at 254±15 GPa, which is consistent with ambient and a recent static high pressure melt curve measurement.
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Affiliation(s)
- R G Kraus
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F Coppari
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D E Fratanduono
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R F Smith
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Lazicki
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Wehrenberg
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J H Eggert
- Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J R Rygg
- Laboratory for Laser Energetics, and Departments of Mechanical Engineering and Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
| | - G W Collins
- Laboratory for Laser Energetics, and Departments of Mechanical Engineering and Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
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Barden M, Smith RF, Higgins HM. The interpretation of serial Johne's disease milk antibody results is affected by test characteristics, pattern of test results and parallel bovine tuberculosis testing. Prev Vet Med 2020; 183:105134. [PMID: 32912605 DOI: 10.1016/j.prevetmed.2020.105134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 08/11/2020] [Accepted: 08/27/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND In the UK, quarterly Johne's disease milk antibody ELISAs (JD-mELISAs) are commonly used to classify animals which are likely to be infectious, termed "red cows". "Red cows" are classified following two positive results from the previous four tests (e.g. + - - +). All cattle are also regularly screened for bovine tuberculosis using intradermal avian and bovine tuberculin, and it is advised to maintain a 60 day interval between a tuberculosis test and JD-mELISA. AIMS To evaluate the impact of bovine tuberculosis testing on JD-mELISAs, and to quantify the impact of test specificity and "red cow" classification test pattern on the probability of infection. METHODS Four years of individual cow milk records with JD-mELISA results were collated from 735 dairy farms and matched to tuberculosis testing records. A two-level multivariable logistic regression model quantified the effect of tuberculosis testing on JD-mELISA result. The specificity and age-dependent sensitivity of a single JD-mELISA were estimated and used to calculate likelihood ratios following each test. Using Bayes' theorem, the posterior probability of infection with Johne's disease was calculated for different specificities, ages of cow, and patterns of test results. RESULTS There were increased odds of a positive JD-mELISA if it was ≤30 days (OR: 2.1) or 31-60 days (OR: 1.2) after a tuberculosis test, compared to >90 days. A larger avian skin reaction at the tuberculosis test was also associated with increased odds of a positive JD-mELISA. The proportion of cows which tested exclusively negative after their first positive JD-mELISA was higher if that JD-mELISA was ≤30 days after a tuberculosis test compared to >90 days. The posterior probability of infection reduced substantially when the test specificity was slightly reduced. In "red cows" classified following two consecutive positive tests, if the test specificity was reduced to 0.95, then the posterior probability of infection was only >95 % if the prior probability was >13 %. If the "red cow" classification was due to two non-consecutive positive tests (+ - - +), the posterior probability of infection was only >95 % if the prior probability was >43 %. CONCLUSIONS Testing for Johne's disease within 60 days of a tuberculosis test is associated with a higher chance of a positive JD-mELISA and this may reflect a reduction in the ELISA specificity. Relatively small reductions in JD-mELISA specificity can markedly reduce the posterior probability of infection which also depends on the pattern of test results which classifies "red cows".
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Affiliation(s)
- M Barden
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, United Kingdom.
| | - R F Smith
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, United Kingdom
| | - H M Higgins
- Department of Livestock and One Health, Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, United Kingdom
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12
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Rygg JR, Smith RF, Lazicki AE, Braun DG, Fratanduono DE, Kraus RG, McNaney JM, Swift DC, Wehrenberg CE, Coppari F, Ahmed MF, Barrios MA, Blobaum KJM, Collins GW, Cook AL, Di Nicola P, Dzenitis EG, Gonzales S, Heidl BF, Hohenberger M, House A, Izumi N, Kalantar DH, Khan SF, Kohut TR, Kumar C, Masters ND, Polsin DN, Regan SP, Smith CA, Vignes RM, Wall MA, Ward J, Wark JS, Zobrist TL, Arsenlis A, Eggert JH. X-ray diffraction at the National Ignition Facility. Rev Sci Instrum 2020; 91:043902. [PMID: 32357733 DOI: 10.1063/1.5129698] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/20/2020] [Indexed: 06/11/2023]
Abstract
We report details of an experimental platform implemented at the National Ignition Facility to obtain in situ powder diffraction data from solids dynamically compressed to extreme pressures. Thin samples are sandwiched between tamper layers and ramp compressed using a gradual increase in the drive-laser irradiance. Pressure history in the sample is determined using high-precision velocimetry measurements. Up to two independently timed pulses of x rays are produced at or near the time of peak pressure by laser illumination of thin metal foils. The quasi-monochromatic x-ray pulses have a mean wavelength selectable between 0.6 Å and 1.9 Å depending on the foil material. The diffracted signal is recorded on image plates with a typical 2θ x-ray scattering angle uncertainty of about 0.2° and resolution of about 1°. Analytic expressions are reported for systematic corrections to 2θ due to finite pinhole size and sample offset. A new variant of a nonlinear background subtraction algorithm is described, which has been used to observe diffraction lines at signal-to-background ratios as low as a few percent. Variations in system response over the detector area are compensated in order to obtain accurate line intensities; this system response calculation includes a new analytic approximation for image-plate sensitivity as a function of photon energy and incident angle. This experimental platform has been used up to 2 TPa (20 Mbar) to determine the crystal structure, measure the density, and evaluate the strain-induced texturing of a variety of compressed samples spanning periods 2-7 on the periodic table.
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Affiliation(s)
- J R Rygg
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A E Lazicki
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D G Braun
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R G Kraus
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J M McNaney
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D C Swift
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - C E Wehrenberg
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M F Ahmed
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M A Barrios
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - K J M Blobaum
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - G W Collins
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A L Cook
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - P Di Nicola
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - E G Dzenitis
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - S Gonzales
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - B F Heidl
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M Hohenberger
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A House
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - N Izumi
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D H Kalantar
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - S F Khan
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - T R Kohut
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - C Kumar
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - N D Masters
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - D N Polsin
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - S P Regan
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA
| | - C A Smith
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R M Vignes
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M A Wall
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J Ward
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J S Wark
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - T L Zobrist
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A Arsenlis
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
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13
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Jiang S, Lazicki AE, Hansen SB, Sterne PA, Grabowski P, Shepherd R, Scott HA, Smith RF, Eggert JH, Ping Y. Measurements of pressure-induced Kβ line shifts in ramp compressed cobalt up to 8 Mbar. Phys Rev E 2020; 101:023204. [PMID: 32168658 DOI: 10.1103/physreve.101.023204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 12/17/2019] [Indexed: 11/07/2022]
Abstract
We report measurements of K-shell fluorescence lines induced by fast electrons in ramp-compressed Co targets. The fluorescence emission was stimulated by fast electrons generated through short-pulse laser-solid interaction with an Al target layer. Compression up to 2.1× solid density was achieved while maintaining temperatures well below the Fermi energy, effectively removing the thermal effects from consideration. We observed small but unambiguous redshifts in the Kβ fluorescence line relative to unshifted Cu Kα. Redshifts up to 2.6 eV were found to increase with compression and to be consistent with predictions from self-consistent models based on density-functional theory.
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Affiliation(s)
- S Jiang
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A E Lazicki
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S B Hansen
- Sandia National Laboratory, Albuquerque, New Mexico 87185, USA
| | - P A Sterne
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P Grabowski
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Shepherd
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - H A Scott
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - Y Ping
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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14
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Fratanduono DE, Smith RF, Ali SJ, Braun DG, Fernandez-Pañella A, Zhang S, Kraus RG, Coppari F, McNaney JM, Marshall MC, Kirch LE, Swift DC, Millot M, Wicks JK, Eggert JH. Probing the Solid Phase of Noble Metal Copper at Terapascal Conditions. Phys Rev Lett 2020; 124:015701. [PMID: 31976690 DOI: 10.1103/physrevlett.124.015701] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 07/22/2019] [Indexed: 06/10/2023]
Abstract
Ramp compression along a low-temperature adiabat offers a unique avenue to explore the physical properties of materials at the highest densities of their solid form, a region inaccessible by single shock compression. Using the National Ignition Facility and OMEGA laser facilities, copper samples were ramp compressed to peak pressures of 2.30 TPa and densities of nearly 30 g/cc, providing fundamental information regarding the compressibility and phase of copper at pressures more than 5 times greater than previously explored. Through x-ray diffraction measurements, we find that the ambient face-centered-cubic structure is preserved up to 1.15 TPa. The ramp compression equation-of-state measurements shows that there are no discontinuities in sound velocities up to 2.30 TPa, suggesting this phase is likely stable up to the peak pressures measured, as predicted by first-principal calculations. The high precision of these quasiabsolute measurements enables us to provide essential benchmarks for advanced computational studies on the behavior of dense monoatomic materials under extreme conditions that constitute a stringent test for solid-state quantum theory. We find that both density-functional theory and the stabilized jellium model, which assumes that the ionic structure can be replaced by an ionic charge distribution by constant positive-charge background, reproduces our data well. Further, our data could serve to establish new international secondary scales of pressure in the terapascal range that is becoming experimentally accessible with advanced static and dynamic compression techniques.
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Affiliation(s)
- D E Fratanduono
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S J Ali
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D G Braun
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | | | - S Zhang
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R G Kraus
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J M McNaney
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M C Marshall
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - L E Kirch
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D C Swift
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Millot
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J K Wicks
- Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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15
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Heighway PG, Sliwa M, McGonegle D, Wehrenberg C, Bolme CA, Eggert J, Higginbotham A, Lazicki A, Lee HJ, Nagler B, Park HS, Rudd RE, Smith RF, Suggit MJ, Swift D, Tavella F, Remington BA, Wark JS. Nonisentropic Release of a Shocked Solid. Phys Rev Lett 2019; 123:245501. [PMID: 31922830 DOI: 10.1103/physrevlett.123.245501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Revised: 09/09/2019] [Indexed: 06/10/2023]
Abstract
We present molecular dynamics simulations of shock and release in micron-scale tantalum crystals that exhibit postbreakout temperatures far exceeding those expected under the standard assumption of isentropic release. We show via an energy-budget analysis that this is due to plastic-work heating from material strength that largely counters thermoelastic cooling. The simulations are corroborated by experiments where the release temperatures of laser-shocked tantalum foils are deduced from their thermal strains via in situ x-ray diffraction and are found to be close to those behind the shock.
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Affiliation(s)
- P G Heighway
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - M Sliwa
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - D McGonegle
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - C Wehrenberg
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - C A Bolme
- Los Alamos National Laboratory, Bikini Atoll Road, SM-30, Los Alamos, New Mexico 87545, USA
| | - J Eggert
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - A Higginbotham
- York Plasma Institute, University of York, Heslington, York YO10 5DD, United Kingdom
| | - A Lazicki
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - H J Lee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - B Nagler
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - H-S Park
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - R E Rudd
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - M J Suggit
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
| | - D Swift
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - F Tavella
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550, USA
| | - J S Wark
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
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16
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Cheney KN, Roy AH, Smith RF, Dewalt RE. Effects of Stream Temperature and Substrate Type on Emergence Patterns of Plecoptera and Trichoptera From Northeastern United States Headwater Streams. Environ Entomol 2019; 48:1349-1359. [PMID: 31554010 DOI: 10.1093/ee/nvz106] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Indexed: 06/10/2023]
Abstract
The timing and spatial distribution of aquatic insect emergence is linked to the abiotic and biotic environment in streams. Studies of aquatic insect emergence are needed to generate baseline data to identify potential shifts in phenology and habitat-related emergence with global change. The purpose of this study was to 1) compare the timing of Plecoptera (stonefly) species emergence between two streams with different thermal regimes and 2) characterize the distribution of emerging Plecoptera and Trichoptera (caddisflies) from wood, rock, gravel, and sand substrates in five forested, headwater streams. Emergence timing and duration varied among Plecoptera species, with Ostrocerca albidipennis (Walker) (Plecoptera: Nemouridae) emerging only in May and four species in the genus Leuctra (Plecoptera: Leuctridae) collectively emerging throughout the summer (May to September). We observed earlier emergence of Amphinemura nigritta (Provancher) (Plecoptera: Nemouridae) and a longer total emergence period for Leuctra ferruginea (Walker) (Plecoptera: Leuctridae) in the stream with ~1.5°C warmer temperatures, which suggested that some insects may experience phenological shifts in streams with subtle differences in temperature. The abundance of plecopteran and trichopteran taxa emerging from wood was generally greater than for gravel or sand, and sand was the least preferred emergence substrate. The results suggest that human actions that decrease large wood and increase fine sedimentation may decrease habitat quality for many insect larvae and limit preferred emergence substrates.
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Affiliation(s)
- Kristin N Cheney
- U.S. Geological Survey, Massachusetts Cooperative Fish and Wildlife Research Unit, Department of Environmental Conservation, University of Massachusetts, Amherst, MA
| | - Allison H Roy
- U.S. Geological Survey, Massachusetts Cooperative Fish and Wildlife Research Unit, Department of Environmental Conservation, University of Massachusetts, Amherst, MA
| | - Robert F Smith
- U.S. Geological Survey, Massachusetts Cooperative Fish and Wildlife Research Unit, Department of Environmental Conservation, University of Massachusetts, Amherst, MA
- Lycoming College Clean Water Institute, Department of Biology, Lycoming College, Williamsport, PA
| | - R Edward Dewalt
- University of Illinois, Prairie Research Institute, Illinois Natural History Survey, Champaign, IL
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17
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Coppari F, Smith RF, Thorn DB, Rygg JR, Liedahl DA, Kraus RG, Lazicki A, Millot M, Eggert JH. Optimized x-ray sources for x-ray diffraction measurements at the Omega Laser Facility. Rev Sci Instrum 2019; 90:125113. [PMID: 31893795 DOI: 10.1063/1.5111878] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Accepted: 11/20/2019] [Indexed: 06/10/2023]
Abstract
The use of x-ray diffraction (XRD) measurements in laser-driven dynamic compression experiments at high-power laser facilities is becoming increasingly common. Diffraction allows one to probe in situ the transformations occurring at the atomic level at extreme conditions of pressure, temperature, and time scale. In these measurements, the x-ray source is generated by irradiation of a solid foil. Under certain laser drive conditions, quasimonochromatic He-α radiation is generated. Careful analysis of the x-ray source plasma spectra reveals that this radiation is not a single line emission and that monochromaticity is highly dependent on the laser irradiance. In this work, we analyze how the spectra emitted by laser-irradiated copper, germanium, and iron foils at the Omega Laser vary depending on different laser drive conditions and discuss the implications for XRD experiments.
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Affiliation(s)
- F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D B Thorn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J R Rygg
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D A Liedahl
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R G Kraus
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A Lazicki
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M Millot
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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18
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Sánchez-Molano E, Bay V, Smith RF, Oikonomou G, Banos G. Quantitative Trait Loci Mapping for Lameness Associated Phenotypes in Holstein-Friesian Dairy Cattle. Front Genet 2019; 10:926. [PMID: 31636655 PMCID: PMC6787292 DOI: 10.3389/fgene.2019.00926] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 09/05/2019] [Indexed: 01/08/2023] Open
Abstract
Lameness represents a significant challenge for the dairy cattle industry, resulting in economic losses and reduced animal health and welfare. The existence of underlying genomic variation for lameness associated traits has the potential to improve selection strategies by using genomic markers. Therefore, the aim of this study was to identify genomic regions and potential candidate genes associated with lameness traits. Lameness related lesions and digital cushion thickness were studied using records collected by our research team, farm records, and a combination of both. Genome-wide analyses were performed to identify significant genomic effects, and a combination of single SNP association analysis and regional heritability mapping was used to identify associated genomic regions. Significant genomic effects were identified for several lameness related traits: Two genomic regions were identified on chromosome 3 associated with digital dermatitis and interdigital hyperplasia, one genomic region on chromosome 23 associated with interdigital hyperplasia, and one genomic region on chromosome 2 associated with sole haemorrhage. Candidate genes in those regions are mainly related to immune response and fibroblast proliferation. Quantitative trait loci (QTL) identified in this study could enlighten the understanding of lameness pathogenesis, providing an opportunity to improve health and welfare in dairy cattle with the addition of these regions into selection programs.
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Affiliation(s)
- Enrique Sánchez-Molano
- The Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Edinburgh, United Kingdom
| | - Veysel Bay
- Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom.,Bandirma Sheep Research Institute, The Ministry of Agriculture and Forestry, Balikesir, Turkey
| | - Robert F Smith
- Institute of Veterinary Science, University of Liverpool, Leahurst Campus, Liverpool, United Kingdom
| | - Georgios Oikonomou
- Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom.,Institute of Veterinary Science, University of Liverpool, Leahurst Campus, Liverpool, United Kingdom
| | - Georgios Banos
- The Roslin Institute and R(D)SVS, University of Edinburgh, Easter Bush, Edinburgh, United Kingdom.,The Roslin Institute Building, Scotland's Rural College, Easter Bush, Edinburgh, United Kingdom
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19
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Briggs R, Coppari F, Gorman MG, Smith RF, Tracy SJ, Coleman AL, Fernandez-Pañella A, Millot M, Eggert JH, Fratanduono DE. Measurement of Body-Centered Cubic Gold and Melting under Shock Compression. Phys Rev Lett 2019; 123:045701. [PMID: 31491279 DOI: 10.1103/physrevlett.123.045701] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Indexed: 06/10/2023]
Abstract
We combined laser shock compression with in situ x-ray diffraction to probe the crystallographic state of gold (Au) on its principal shock Hugoniot. Au has long been recognized as an important calibration standard in diamond anvil cell experiments due to the stability of its face-centered cubic (fcc) structure to extremely high pressures (P >600 GPa at 300 K). This is in contrast to density functional theory and first principles calculations of the high-pressure phases of Au that predict a variety of fcc-like structures with different stacking arrangements at intermediate pressures. In this Letter, we probe high-pressure and high-temperature conditions on the shock Hugoniot and observe fcc Au at 169 GPa and the first evidence of body-centered cubic (bcc) Au at 223 GPa. Upon further compression, the bcc phase is observed in coexistence with liquid scattering as the Hugoniot crosses the Au melt curve before 322 GPa. The results suggest a triple point on the Au phase diagram that lies very close to the principal shock Hugoniot near ∼220 GPa.
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Affiliation(s)
- R Briggs
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | - M G Gorman
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | - S J Tracy
- Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20015, USA
| | - A L Coleman
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | | | - M Millot
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, Livermore, California 94500, USA
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20
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Coleman AL, Gorman MG, Briggs R, McWilliams RS, McGonegle D, Bolme CA, Gleason AE, Fratanduono DE, Smith RF, Galtier E, Lee HJ, Nagler B, Granados E, Collins GW, Eggert JH, Wark JS, McMahon MI. Identification of Phase Transitions and Metastability in Dynamically Compressed Antimony Using Ultrafast X-Ray Diffraction. Phys Rev Lett 2019; 122:255704. [PMID: 31347883 DOI: 10.1103/physrevlett.122.255704] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Indexed: 06/10/2023]
Abstract
Ultrafast x-ray diffraction at the LCLS x-ray free electron laser has been used to resolve the structural behavior of antimony under shock compression to 59 GPa. Antimony is seen to transform to the incommensurate, host-guest phase Sb-II at ∼11 GPa, which forms on nanosecond timescales with ordered guest-atom chains. The high-pressure bcc phase Sb-III is observed above ∼15 GPa, some 8 GPa lower than in static compression studies, and mixed Sb-III/liquid diffraction are obtained between 38 and 59 GPa. An additional phase which does not exist under static compression, Sb-I^{'}, is also observed between 8 and 12 GPa, beyond the normal stability field of Sb-I, and resembles Sb-I with a resolved Peierls distortion. The incommensurate Sb-II high-pressure phase can be recovered metastably on release to ambient pressure, where it is stable for more than 10 ns.
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Affiliation(s)
- A L Coleman
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94500, USA
| | - M G Gorman
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94500, USA
| | - R Briggs
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94500, USA
| | - R S McWilliams
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - D McGonegle
- Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - C A Bolme
- Shock and Detonation Physics, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
| | - A E Gleason
- Shock and Detonation Physics, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
- Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94500, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94500, USA
| | - E Galtier
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - H J Lee
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - B Nagler
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - E Granados
- Linac Coherent Light Source (LCLS), SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - G W Collins
- Department of Mechanical of Engineering, University of Rochester, 235 Hopeman Building, P.O. Box 270132, Rochester, New York 12647, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94500, USA
| | - J S Wark
- Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - M I McMahon
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
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21
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Gorman MG, Coleman AL, Briggs R, McWilliams RS, McGonegle D, Bolme CA, Gleason AE, Galtier E, Lee HJ, Granados E, Śliwa M, Sanloup C, Rothman S, Fratanduono DE, Smith RF, Collins GW, Eggert JH, Wark JS, McMahon MI. Femtosecond diffraction studies of solid and liquid phase changes in shock-compressed bismuth. Sci Rep 2018; 8:16927. [PMID: 30446720 PMCID: PMC6240068 DOI: 10.1038/s41598-018-35260-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 10/28/2018] [Indexed: 11/09/2022] Open
Abstract
Bismuth has long been a prototypical system for investigating phase transformations and melting at high pressure. Despite decades of experimental study, however, the lattice-level response of Bi to rapid (shock) compression and the relationship between structures occurring dynamically and those observed during slow (static) compression, are still not clearly understood. We have determined the structural response of shock-compressed Bi to 68 GPa using femtosecond X-ray diffraction, thereby revealing the phase transition sequence and equation-of-state in unprecedented detail for the first time. We show that shocked-Bi exhibits a marked departure from equilibrium behavior - the incommensurate Bi-III phase is not observed, but rather a new metastable phase, and the Bi-V phase is formed at significantly lower pressures compared to static compression studies. We also directly measure structural changes in a shocked liquid for the first time. These observations reveal new behaviour in the solid and liquid phases of a shocked material and give important insights into the validity of comparing static and dynamic datasets.
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Affiliation(s)
- M G Gorman
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, EH9 3FD, UK.
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94500, USA.
| | - A L Coleman
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, EH9 3FD, UK
| | - R Briggs
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, EH9 3FD, UK
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94500, USA
| | - R S McWilliams
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, EH9 3FD, UK
| | - D McGonegle
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
| | - C A Bolme
- Shock and Detonation Physics, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico, 87545, USA
| | - A E Gleason
- Shock and Detonation Physics, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico, 87545, USA
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California, 94025, USA
| | - E Galtier
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - H J Lee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - E Granados
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - M Śliwa
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
| | - C Sanloup
- Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, F-75005, Paris, France
| | - S Rothman
- Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, United Kingdom
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94500, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94500, USA
| | - G W Collins
- Departments of Mechanical Engineering, Physics and Astronomy, and Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14627, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA, 94500, USA
| | - J S Wark
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
| | - M I McMahon
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh, EH9 3FD, UK
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22
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Smith RF. Questioning the Benefits of Private Vehicle Transportation vs Emergency Medical Services Transportation. JAMA Surg 2018. [DOI: 10.1001/jamasurg.2018.0096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Affiliation(s)
- Robert F. Smith
- Former Division of Prehospital Care and Prevention, Department of Trauma, John H. Stroger Jr Hospital of Cook County, Chicago, Illinois
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23
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Polsin DN, Fratanduono DE, Rygg JR, Lazicki A, Smith RF, Eggert JH, Gregor MC, Henderson BH, Delettrez JA, Kraus RG, Celliers PM, Coppari F, Swift DC, McCoy CA, Seagle CT, Davis JP, Burns SJ, Collins GW, Boehly TR. Erratum: Measurement of Body-Centered-Cubic Aluminum at 475 GPa [Phys. Rev. Lett. 119, 175702 (2017)]. Phys Rev Lett 2018; 120:029902. [PMID: 29376685 DOI: 10.1103/physrevlett.120.029902] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Indexed: 06/07/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.119.175702.
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Polsin DN, Fratanduono DE, Rygg JR, Lazicki A, Smith RF, Eggert JH, Gregor MC, Henderson BH, Delettrez JA, Kraus RG, Celliers PM, Coppari F, Swift DC, McCoy CA, Seagle CT, Davis JP, Burns SJ, Collins GW, Boehly TR. Measurement of Body-Centered-Cubic Aluminum at 475 GPa. Phys Rev Lett 2017; 119:175702. [PMID: 29219452 DOI: 10.1103/physrevlett.119.175702] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Indexed: 06/07/2023]
Abstract
Nanosecond in situ x-ray diffraction and simultaneous velocimetry measurements were used to determine the crystal structure and pressure, respectively, of ramp-compressed aluminum at stress states between 111 and 475 GPa. The solid-solid Al phase transformations, fcc-hcp and hcp-bcc, are observed at 216±9 and 321±12 GPa, respectively, with the bcc phase persisting to 475 GPa. The high-pressure crystallographic texture of the hcp and bcc phases suggests close-packed or nearly close-packed lattice planes remain parallel through both transformations.
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Affiliation(s)
- D N Polsin
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J R Rygg
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA
| | - A Lazicki
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - M C Gregor
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B H Henderson
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
| | - J A Delettrez
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
| | - R G Kraus
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - P M Celliers
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - F Coppari
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D C Swift
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C A McCoy
- Sandia National Laboratories, PO Box 5800, Albuquerque, New Mexico 87185-1189, USA
| | - C T Seagle
- Sandia National Laboratories, PO Box 5800, Albuquerque, New Mexico 87185-1189, USA
| | - J-P Davis
- Sandia National Laboratories, PO Box 5800, Albuquerque, New Mexico 87185-1189, USA
| | - S J Burns
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA
| | - G W Collins
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
- Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA
- Department of Mechanical Engineering, University of Rochester, Rochester, New York 14627, USA
| | - T R Boehly
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA
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25
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Spaulding DK, McWilliams RS, Jeanloz R, Eggert JH, Celliers PM, Hicks DG, Collins GW, Smith RF. Erratum: Evidence for a Phase Transition in Silicate Melt at Extreme Pressure and Temperature Conditions [Phys. Rev. Lett. 108, 065701 (2012)]. Phys Rev Lett 2017; 119:139903. [PMID: 29341693 DOI: 10.1103/physrevlett.119.139903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Indexed: 06/07/2023]
Abstract
This corrects the article DOI: 10.1103/PhysRevLett.108.065701.
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Fergani C, Routly JE, Jones DN, Pickavance LC, Smith RF, Dobson H. KNDy neurone activation prior to the LH surge of the ewe is disrupted by LPS. Reproduction 2017. [PMID: 28630099 DOI: 10.1530/rep-17-0191] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In the ewe, steroid hormones act on the hypothalamic arcuate nucleus (ARC) to initiate the GnRH/LH surge. Within the ARC, steroid signal transduction may be mediated by estrogen receptive dopamine-, β-endorphin- or neuropeptide Y (NPY)-expressing cells, as well as those co-localising kisspeptin, neurokinin B (NKB) and dynorphin (termed KNDy). We investigated the time during the follicular phase when these cells become activated (i.e., co-localise c-Fos) relative to the timing of the LH surge onset and may therefore be involved in the surge generating mechanism. Furthermore, we aimed to elucidate whether these activation patterns are altered after lipopolysaccharide (LPS) administration, which is known to inhibit the LH surge. Follicular phases of ewes were synchronised by progesterone withdrawal and blood samples were collected every 2 h. Hypothalamic tissue was retrieved at various times during the follicular phase with or without the administration of LPS (100 ng/kg). The percentage of activated dopamine cells decreased before the onset of sexual behaviour, whereas activation of β-endorphin decreased and NPY activation tended to increase during the LH surge. These patterns were not disturbed by LPS administration. Maximal co-expression of c-Fos in dynorphin immunoreactive neurons was observed earlier during the follicular phase, compared to kisspeptin and NKB, which were maximally activated during the surge. This indicates a distinct role for ARC dynorphin in the LH surge generation mechanism. Acute LPS decreased the percentage of activated dynorphin and kisspeptin immunoreactive cells. Thus, in the ovary-intact ewe, KNDy neurones are activated prior to the LH surge onset and this pattern is inhibited by the administration of LPS.
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Affiliation(s)
- C Fergani
- School of Veterinary Science, University of Liverpool, Liverpool, UK
| | - J E Routly
- School of Veterinary Science, University of Liverpool, Liverpool, UK
| | - D N Jones
- School of Veterinary Science, University of Liverpool, Liverpool, UK
| | - L C Pickavance
- School of Veterinary Science, University of Liverpool, Liverpool, UK
| | - R F Smith
- School of Veterinary Science, University of Liverpool, Liverpool, UK
| | - H Dobson
- School of Veterinary Science, University of Liverpool, Liverpool, UK
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27
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Ehlinger DG, Burke JC, McDonald CG, Smith RF, Bergstrom HC. Nicotine-induced and D1-receptor-dependent dendritic remodeling in a subset of dorsolateral striatum medium spiny neurons. Neuroscience 2017; 356:242-254. [PMID: 28576726 DOI: 10.1016/j.neuroscience.2017.05.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 05/11/2017] [Accepted: 05/22/2017] [Indexed: 01/25/2023]
Abstract
Nicotine is one of the most addictive substances known, targeting multiple memory systems, including the ventral and dorsal striatum. One form of neuroplasticity commonly associated with nicotine is dendrite remodeling. Nicotine-induced dendritic remodeling of ventral striatal medium spiny neurons (MSNs) is well-documented. Whether MSN dendrites in the dorsal striatum undergo a similar pattern of nicotine-induced structural remodeling is unknown. A morphometric analysis of Golgi-stained MSNs in rat revealed a natural asymmetry in dendritic morphology across the mediolateral axis, with larger, more complex MSNs found in the dorsolateral striatum (DLS). Chronic nicotine produced a lasting (at least 21day) expansion in the dendritic complexity of MSNs in the DLS, but not dorsomedial striatum (DMS). Given prior evidence that MSN subtypes can be distinguished based on dendritic morphology, MSNs were segregated into morphological subpopulations based on the number of primary dendrites. Analysis of these subpopulations revealed that DLS MSNs with more primary dendrites were selectively remodeled by chronic nicotine exposure and remodeling was specific to the distal-most portions of the dendritic arbor. Co-administration of the dopamine D1 receptor (D1R) antagonist SCH23390 completely reversed the selective effects of nicotine on DLS MSN dendrite morphology, supporting a causal role for dopamine signaling at D1 receptors in nicotine-induced dendrite restructuring. Considering the functional importance of the DLS in shaping and expressing habitual behavior, these data support a model in which nicotine induces persistent and selective changes in the circuit connectivity of the DLS that may promote and sustain addiction-related behavior.
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Affiliation(s)
- Daniel G Ehlinger
- Department of Anesthesiology, Perioperative and Pain Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
| | - Julian C Burke
- Department of Psychology, George Mason University, Fairfax, VA, USA
| | - Craig G McDonald
- Department of Psychology, George Mason University, Fairfax, VA, USA
| | - Robert F Smith
- Department of Psychology, George Mason University, Fairfax, VA, USA
| | - Hadley C Bergstrom
- Department of Psychological Science, Program in Neuroscience and Behavior, Vassar College, Poughkeepsie, NY, USA.
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28
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Briggs R, Gorman MG, Coleman AL, McWilliams RS, McBride EE, McGonegle D, Wark JS, Peacock L, Rothman S, Macleod SG, Bolme CA, Gleason AE, Collins GW, Eggert JH, Fratanduono DE, Smith RF, Galtier E, Granados E, Lee HJ, Nagler B, Nam I, Xing Z, McMahon MI. Ultrafast X-Ray Diffraction Studies of the Phase Transitions and Equation of State of Scandium Shock Compressed to 82 GPa. Phys Rev Lett 2017; 118:025501. [PMID: 28128621 DOI: 10.1103/physrevlett.118.025501] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Indexed: 06/06/2023]
Abstract
Using x-ray diffraction at the Linac Coherent Light Source x-ray free-electron laser, we have determined simultaneously and self-consistently the phase transitions and equation of state (EOS) of the lightest transition metal, scandium, under shock compression. On compression scandium undergoes a structural phase transition between 32 and 35 GPa to the same bcc structure seen at high temperatures at ambient pressures, and then a further transition at 46 GPa to the incommensurate host-guest polymorph found above 21 GPa in static compression at room temperature. Shock melting of the host-guest phase is observed between 53 and 72 GPa with the disappearance of Bragg scattering and the growth of a broad asymmetric diffraction peak from the high-density liquid.
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Affiliation(s)
- R Briggs
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom
| | - M G Gorman
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom
| | - A L Coleman
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom
| | - R S McWilliams
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom
| | - E E McBride
- European XFEL, Albert-Einstein-Ring 19, D-22761 Hamburg, Germany
| | - D McGonegle
- Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - J S Wark
- Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, Oxford OX1 3PU, United Kingdom
| | - L Peacock
- Atomic Weapons Establishment, Aldermaston, Reading RG7 4PR, United Kingdom
| | - S Rothman
- Atomic Weapons Establishment, Aldermaston, Reading RG7 4PR, United Kingdom
| | - S G Macleod
- Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, United Kingdom and Institute of Shock Physics, Imperial College London, SW7 2AZ, United Kingdom
| | - C A Bolme
- Shock and Detonation Physics, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
| | - A E Gleason
- Shock and Detonation Physics, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA
| | - G W Collins
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - E Galtier
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - E Granados
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - H J Lee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - B Nagler
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - I Nam
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - Z Xing
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - M I McMahon
- SUPA, School of Physics and Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ, United Kingdom and Research Complex at Harwell, Didcot, Oxon OX11 0FA, United Kingdom
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29
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Coyne LA, Latham SM, Williams NJ, Dawson S, Donald IJ, Pearson RB, Smith RF, Pinchbeck GL. Understanding the culture of antimicrobial prescribing in agriculture: a qualitative study of UK pig veterinary surgeons. J Antimicrob Chemother 2016; 71:3300-3312. [PMID: 27516473 PMCID: PMC5079303 DOI: 10.1093/jac/dkw300] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 06/18/2016] [Accepted: 06/24/2016] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVES The use of antimicrobials in food-producing animals has been linked with the emergence of antimicrobial resistance in bacterial populations, with consequences for animal and public health. This study explored the underpinning drivers, motivators and reasoning behind prescribing decisions made by veterinary surgeons working in the UK pig industry. METHODS A qualitative interview study was conducted with 21 veterinary surgeons purposively selected from all UK pig veterinary surgeons. Thematic analysis was used to analyse transcripts. RESULTS Ensuring optimum pig health and welfare was described as a driver for antimicrobial use by many veterinary surgeons and was considered a professional and moral obligation. Veterinary surgeons also exhibited a strong sense of social responsibility over the need to ensure that antimicrobial use was responsible. A close relationship between management practices, health and economics was evident, with improvements in management commonly identified as being potential routes to reduce antimicrobial usage; however, these were not always considered economically viable. The relationship with clients was identified as being a source of professional stress for practitioners due to pressure from farmers requesting antimicrobial prescriptions, and concern over poor compliance of antimicrobial administration by some farmers. CONCLUSIONS The drivers behind prescribing decisions by veterinary surgeons were complex and diverse. A combination of education, improving communication between veterinary surgeons and farmers, and changes in regulations, in farm management and in consumer/retailer demands may all be needed to ensure that antimicrobial prescribing is optimal and to achieve significant reductions in use.
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Affiliation(s)
- L A Coyne
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - S M Latham
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - N J Williams
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - S Dawson
- School of Veterinary Science, Faculty of Health and Life Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - I J Donald
- Institute of Psychology, Health & Society, University of Liverpool, Bedford Street South, Liverpool L69 7ZA, UK
| | - R B Pearson
- The George Pig Practice, High Street, Malmesbury, Wiltshire SN16 9AU, UK
| | - R F Smith
- School of Veterinary Science, Faculty of Health and Life Sciences, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - G L Pinchbeck
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
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Rutherford AJ, Oikonomou G, Smith RF. The effect of subclinical ketosis on activity at estrus and reproductive performance in dairy cattle. J Dairy Sci 2016; 99:4808-4815. [DOI: 10.3168/jds.2015-10154] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 02/08/2016] [Indexed: 11/19/2022]
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31
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Vignes RM, Ahmed MF, Eggert JH, Fisher AC, Kalantar DH, Masters ND, Smith CA, Smith RF. TARDIS-C: A target diagnostic for measuring material structure at high pressure. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/717/1/012115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ferry JJ, Smith RF, Denney N, Walsh CP, McCauley L, Qian J, Ma H, Horiuchi KY, Howitz KT. Development and Use of Assay Conditions Suited to Screening for and Profiling of SET-Domain-Targeted Inhibitors of the MLL/SET1 Family of Lysine Methyltransferases. Assay Drug Dev Technol 2016; 13:221-34. [PMID: 26065558 DOI: 10.1089/adt.2015.646] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Methylation of histone H3 lysine-4 (H3K4) is an important, regulatory, epigenetic post-translational modification associated with actively transcribed genes. In humans, the principal mediators of this modification are part of the MLL/SET1 family of methyltransferases, which comprises six members, MLLs1-4 and SET1A/SET1B. Aberrations in the structure, expression, and regulation of these enzymes are implicated in various disease states, making them important potential targets for drug discovery, particularly for oncology indications. The MLL/SET1 family members are most enzymatically active when part of a "core complex," the catalytic SET-domain-containing subunits bound to a subcomplex consisting of the proteins WDR5, RbBP5, Ash2L and a homodimer of DPY-30 (WRAD2). The necessity of MLL/SET1 members to bind WRAD2 for full activity is the basis of a particular drug development strategy, which seeks to disrupt the interaction between the MLL/SET1 subunits and WDR5. This strategy is not without its theoretical and practical drawbacks, some of which relate to the ease with which complexes of Escherichia coli-expressed MLL/SET1 and WRAD2 fall apart. As an alternative strategy, we explore ways to stabilize the complex, focusing on the use of an excess of WRAD2 to drive the binding equilibria toward complex formation while maintaining low concentrations of the catalytic subunits. The purpose of this approach is to seek inhibitors that bind the SET domain, an approach proven successful with the related, but inherently more stable, enhancer of zeste homolog 2 (EZH2) complex.
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Affiliation(s)
- Joseph J Ferry
- 1 Department of Biochemistry, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Robert F Smith
- 2 Department of Protein Sciences, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Natalie Denney
- 2 Department of Protein Sciences, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Colin P Walsh
- 2 Department of Protein Sciences, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Lauren McCauley
- 2 Department of Protein Sciences, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Jie Qian
- 3 Department of Cell Biology, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Haiching Ma
- 2 Department of Protein Sciences, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Kurumi Y Horiuchi
- 1 Department of Biochemistry, Reaction Biology Corporation , Malvern, Pennsylvania
| | - Konrad T Howitz
- 2 Department of Protein Sciences, Reaction Biology Corporation , Malvern, Pennsylvania
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33
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Spadafora E, Leslie AW, Culler LE, Smith RF, Staver KW, Lamp WO. Macroinvertebrate community convergence between natural, rehabilitated, and created wetlands. Restor Ecol 2016. [DOI: 10.1111/rec.12352] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elanor Spadafora
- Department of Entomology University of Maryland 4112 Plant Sciences Bldg. College Park MD 20742 U.S.A
| | - Alan W. Leslie
- Department of Entomology University of Maryland 4112 Plant Sciences Bldg. College Park MD 20742 U.S.A
| | - Lauren E. Culler
- Institute of Arctic Studies Dartmouth College 6214 Haldeman Center Hanover NH 03755 U.S.A
| | - Robert F. Smith
- Massachusetts Cooperative Fish and Wildlife Research Unit & Department of Environmental Conservation University of Massachusetts Amherst MA 01003‐9285 U.S.A
| | - Kenneth W. Staver
- Wye Research and Education Center University of Maryland PO Box 169 Queenstown MD 21658 U.S.A
| | - William O. Lamp
- Department of Entomology University of Maryland 4112 Plant Sciences Bldg. College Park MD 20742 U.S.A
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Gorman MG, Briggs R, McBride EE, Higginbotham A, Arnold B, Eggert JH, Fratanduono DE, Galtier E, Lazicki AE, Lee HJ, Liermann HP, Nagler B, Rothkirch A, Smith RF, Swift DC, Collins GW, Wark JS, McMahon MI. Direct Observation of Melting in Shock-Compressed Bismuth With Femtosecond X-ray Diffraction. Phys Rev Lett 2015; 115:095701. [PMID: 26371663 DOI: 10.1103/physrevlett.115.095701] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Indexed: 06/05/2023]
Abstract
The melting of bismuth in response to shock compression has been studied using in situ femtosecond x-ray diffraction at an x-ray free electron laser. Both solid-solid and solid-liquid phase transitions are documented using changes in discrete diffraction peaks and the emergence of broad, liquid scattering upon release from shock pressures up to 14 GPa. The transformation from the solid state to the liquid is found to occur in less than 3 ns, very much faster than previously believed. These results are the first quantitative measurements of a liquid material obtained on shock release using x-ray diffraction, and provide an upper limit for the time scale of melting of bismuth under shock loading.
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Affiliation(s)
- M G Gorman
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, UK
| | - R Briggs
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, UK
| | - E E McBride
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, UK
- DESY Photon Science, Notkestr. 85, D-22607 Hamburg, Germany
| | - A Higginbotham
- Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, Oxford OX1 3PU, UK
| | - B Arnold
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - D E Fratanduono
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - E Galtier
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A E Lazicki
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - H J Lee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - H P Liermann
- DESY Photon Science, Notkestr. 85, D-22607 Hamburg, Germany
| | - B Nagler
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A Rothkirch
- DESY Photon Science, Notkestr. 85, D-22607 Hamburg, Germany
| | - R F Smith
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - D C Swift
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - G W Collins
- Lawrence Livermore National Laboratory, 6000 East Avenue, Livermore, California 94500, USA
| | - J S Wark
- Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, Oxford OX1 3PU, UK
| | - M I McMahon
- SUPA, School of Physics & Astronomy, and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, UK
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35
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Smith RF, McDonald CG, Bergstrom HC, Ehlinger DG, Brielmaier JM. Adolescent nicotine induces persisting changes in development of neural connectivity. Neurosci Biobehav Rev 2015; 55:432-43. [PMID: 26048001 DOI: 10.1016/j.neubiorev.2015.05.019] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 05/28/2015] [Accepted: 05/29/2015] [Indexed: 01/16/2023]
Abstract
Adolescent nicotine induces persisting changes in development of neural connectivity. A large number of brain changes occur during adolescence as the CNS matures. These changes suggest that the adolescent brain may still be susceptible to developmental alterations by substances which impact its growth. Here we review recent studies on adolescent nicotine which show that the adolescent brain is differentially sensitive to nicotine-induced alterations in dendritic elaboration, in several brain areas associated with processing reinforcement and emotion, specifically including nucleus accumbens, medial prefrontal cortex, basolateral amygdala, bed nucleus of the stria terminalis, and dentate gyrus. Both sensitivity to nicotine, and specific areas responding to nicotine, differ between adolescent and adult rats, and dendritic changes in response to adolescent nicotine persist into adulthood. Areas sensitive to, and not sensitive to, structural remodeling induced by adolescent nicotine suggest that the remodeling generally corresponds to the extended amygdala. Evidence suggests that dendritic remodeling is accompanied by persisting changes in synaptic connectivity. Modeling, electrophysiological, neurochemical, and behavioral data are consistent with the implication of our anatomical studies showing that adolescent nicotine induces persisting changes in neural connectivity. Emerging data thus suggest that early adolescence is a period when nicotine consumption, presumably mediated by nicotine-elicited changes in patterns of synaptic activity, can sculpt late brain development, with consequent effects on synaptic interconnection patterns and behavior regulation. Adolescent nicotine may induce a more addiction-prone phenotype, and the structures altered by nicotine also subserve some emotional and cognitive functions, which may also be altered. We suggest that dendritic elaboration and associated changes are mediated by activity-dependent synaptogenesis, acting in part through D1DR receptors, in a network activated by nicotine. The adolescent nicotine effects reviewed here suggest that modification of late CNS development constitutes a hazard of adolescent nicotine use.
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Affiliation(s)
- Robert F Smith
- Department of Psychology, George Mason University, MSN 3F5, Fairfax, VA 22030, USA.
| | - Craig G McDonald
- Department of Psychology, George Mason University, MSN 3F5, Fairfax, VA 22030, USA
| | - Hadley C Bergstrom
- Laboratory of Behavioral and Genomic Neuroscience, National Institute on Alcohol Abuse and Alcoholism, National Institutes of Health, 3625 Fishers Lane Room 2N09, Rockville, MD 20814, USA
| | - Daniel G Ehlinger
- Boston Children's Hospital, Department of Anesthesiology, Perioperative, and Pain Medicine, 300 Longwood Ave., Boston, MA 02115, USA
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36
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Smith LN, Bachus SE, McDonald CG, Smith RF. Role of the D3 dopamine receptor in nicotine sensitization. Behav Brain Res 2015; 289:92-104. [PMID: 25907750 DOI: 10.1016/j.bbr.2015.04.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [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: 12/08/2014] [Revised: 04/06/2015] [Accepted: 04/13/2015] [Indexed: 11/29/2022]
Abstract
Adolescent cigarette use is associated with reduced quitting success and continued smoking in adulthood. Interestingly, polymorphisms of the dopamine D3 receptor (DRD3) gene have been associated with smoking behavior, and the receptor is expressed in an age- and brain region-dependent manner that suggests relevance to addiction. Here, we investigate the possible role of dopamine-related receptors, including DRD3 and an intriguing splice variant known as D3nf, in nicotine-induced sensitization. In adolescent and adult male rats, we examined (1) alterations occurring in dopamine receptor-related mRNAs (DRD1, DRD2, DRD3 and D3nf) at two time points during a sensitizing regimen of nicotine and (2) whether DRD3 antagonism either during the initial treatment (induction) or at a later challenge exposure (expression) is able to block nicotine sensitization. Nicotine-induced changes were seen for DRD3 and D3nf mRNAs in the nucleus accumbens shell early in repeated exposure in both age groups. DRD3 antagonism only blocked the induction of sensitization in adolescents and did not block the expression of sensitization in either age group. Adolescents and adults showed opposite DRD1 mRNA responses to nicotine treatment, while no age- and nicotine-related changes in DRD2 mRNA were observed. These data reveal important age-dependent regulation of DRD1- and DRD3-related mRNAs during the course of nicotine exposure. Furthermore, they highlight a requirement for DRD3 signaling in the development of adolescent nicotine sensitization, suggesting it may represent an appropriate target in the prevention of nicotine dependence initiated at this age.
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Affiliation(s)
- Laura N Smith
- George Mason University, Department of Psychology, MSN 3F5, 4400 University Drive, Fairfax, VA 22030, USA.
| | - Susan E Bachus
- George Mason University, Department of Psychology, MSN 3F5, 4400 University Drive, Fairfax, VA 22030, USA
| | - Craig G McDonald
- George Mason University, Department of Psychology, MSN 3F5, 4400 University Drive, Fairfax, VA 22030, USA
| | - Robert F Smith
- George Mason University, Department of Psychology, MSN 3F5, 4400 University Drive, Fairfax, VA 22030, USA
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37
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Singh SB, Kaelin DE, Wu J, Miesel L, Tan CM, Black T, Nargund R, Meinke PT, Olsen DB, Lagrutta A, Lu J, Patel S, Rickert KW, Smith RF, Soisson S, Sherer E, Joyce LA, Wei C, Peng X, Wang X, Fukuda H, Kishii R, Takei M, Takano H, Shibasaki M, Yajima M, Nishimura A, Shibata T, Fukuda Y. Tricyclic 1,5-naphthyridinone oxabicyclooctane-linked novel bacterial topoisomerase inhibitors as broad-spectrum antibacterial agents-SAR of left-hand-side moiety (Part-2). Bioorg Med Chem Lett 2015; 25:1831-5. [PMID: 25851938 DOI: 10.1016/j.bmcl.2015.03.044] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 12/25/2022]
Abstract
Novel bacterial topoisomerase inhibitors (NBTIs) represent a new class of broad-spectrum antibacterial agents targeting bacterial Gyrase A and ParC and have potential utility in combating antibiotic resistance. A series of novel oxabicyclooctane-linked NBTIs with new tricyclic-1,5-naphthyridinone left hand side moieties have been described. Compounds with a (R)-hydroxy-1,5-naphthyridinone moiety (7) showed potent antibacterial activity (e.g., Staphylococcus aureus MIC 0.25 μg/mL), acceptable Gram-positive and Gram-negative spectrum with rapidly bactericidal activity. The compound 7 showed intravenous and oral efficacy (ED50) at 3.2 and 27 mg/kg doses, respectively, in a murine model of bacteremia. Most importantly they showed significant attenuation of functional hERG activity (IC50 >170 μM). In general, lower logD attenuated hERG activity but also reduced Gram-negative activity. The co-crystal structure of a hydroxy-tricyclic NBTI bound to a DNA-gyrase complex exhibited a binding mode that show enantiomeric preference for R isomer and explains the activity and SAR. The discovery, synthesis, SAR and X-ray crystal structure of the left-hand-side tricyclic 1,5-naphthyridinone based oxabicyclooctane linked NBTIs are described.
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Affiliation(s)
- Sheo B Singh
- Merck Research Laboratories, Kenilworth, NJ 07033, United States.
| | - David E Kaelin
- Merck Research Laboratories, Kenilworth, NJ 07033, United States
| | - Jin Wu
- Merck Research Laboratories, Kenilworth, NJ 07033, United States
| | - Lynn Miesel
- Merck Research Laboratories, Kenilworth, NJ 07033, United States
| | | | - Todd Black
- Merck Research Laboratories, Kenilworth, NJ 07033, United States
| | - Ravi Nargund
- Merck Research Laboratories, Kenilworth, NJ 07033, United States
| | - Peter T Meinke
- Merck Research Laboratories, Rahway 07065, United States
| | - David B Olsen
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Armando Lagrutta
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Jun Lu
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Sangita Patel
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Keith W Rickert
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Robert F Smith
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Stephen Soisson
- Merck Research Laboratories, West Point, PA 19486, United States
| | - Edward Sherer
- Merck Research Laboratories, Rahway 07065, United States
| | - Leo A Joyce
- Merck Research Laboratories, Rahway 07065, United States
| | | | - Xuanjia Peng
- WuXi AppTec, Shanghai, People's Republic of China
| | - Xiu Wang
- WuXi AppTec, Shanghai, People's Republic of China
| | - Hideyuki Fukuda
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Ryuta Kishii
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Masaya Takei
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Hisashi Takano
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Mitsuhito Shibasaki
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Masanobu Yajima
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Akinori Nishimura
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Takeshi Shibata
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Yasumichi Fukuda
- Kyorin Pharmaceutical Co., Ltd, 2399-1, Nogi, Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan.
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38
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Harrison S, Poslusney MS, Mulhearn JJ, Zhao Z, Kett N, Schubert JW, Melamed JY, Allison TJ, Patel SB, Sanders JM, Sharma S, Smith RF, Hall DL, Robinson RG, Sachs NA, Hutson PH, Wolkenberg SE, Barrow JC. Synthesis and Evaluation of Heterocyclic Catechol Mimics as Inhibitors of Catechol-O-methyltransferase (COMT). ACS Med Chem Lett 2015; 6:318-23. [PMID: 25815153 PMCID: PMC4360154 DOI: 10.1021/ml500502d] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 12/05/2014] [Accepted: 01/16/2015] [Indexed: 11/28/2022] Open
Abstract
3-Hydroxy-4-pyridinones and 5-hydroxy-4-pyrimidinones were identified as inhibitors of catechol-O-methyltransferase (COMT) in a high-throughput screen. These heterocyclic catechol mimics exhibit potent inhibition of the enzyme and an improved toxicity profile versus the marketed nitrocatechol inhibitors tolcapone and entacapone. Optimization of the series was aided by X-ray cocrystal structures of the novel inhibitors in complex with COMT and cofactors SAM and Mg(2+). The crystal structures suggest a mechanism of inhibition for these heterocyclic inhibitors distinct from previously disclosed COMT inhibitors.
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Affiliation(s)
- Scott
T. Harrison
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Michael S. Poslusney
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - James J. Mulhearn
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Zhijian Zhao
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Nathan
R. Kett
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Jeffrey W. Schubert
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Jeffrey Y. Melamed
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Timothy J. Allison
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Sangita B. Patel
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - John M. Sanders
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Sujata Sharma
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Robert F. Smith
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Dawn L. Hall
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Ronald G. Robinson
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Nancy A. Sachs
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Pete H. Hutson
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - Scott E. Wolkenberg
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
| | - James C. Barrow
- Department
of Medicinal Chemistry, Global Structural Biology, Chemical Modeling and Informatics, and Department of
Neuroscience Research, Merck Research Laboratories, Sumneytown Pike, West Point, Pennsylvania 19486, United States
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39
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Smith KC, Ehlinger DG, Smith RF. Adolescent nicotine alters dendritic morphology in the bed nucleus of the stria terminalis. Neurosci Lett 2015; 590:111-5. [DOI: 10.1016/j.neulet.2015.01.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/21/2015] [Accepted: 01/22/2015] [Indexed: 01/10/2023]
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40
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Fergani C, Routly JE, Jones DN, Pickavance LC, Smith RF, Dobson H. Activation of cells containing estrogen receptor alpha or somatostatin in the medial preoptic area, arcuate nucleus, and ventromedial nucleus of intact ewes during the follicular phase, and alteration after lipopolysaccharide. Biol Reprod 2014; 91:141. [PMID: 25320149 DOI: 10.1095/biolreprod.114.122408] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
Cells in the medial preoptic area (mPOA), arcuate nucleus (ARC), and ventromedial nucleus (VMN) that possess estrogen receptor alpha (ER alpha) mediate estradiol feedback to regulate endocrine and behavioral events during the estrous cycle. A percentage of ER alpha cells located in the ARC and VMN express somatostatin (SST) and are activated in response to estradiol. The aims of the present study were to investigate the location of c-Fos, a marker for activation, in cells containing ER alpha or SST at various times during the follicular phase and to determine whether lipopolysaccharide (LPS) administration, which leads to disruption of the luteinizing hormone (LH) surge, is accompanied by altered ER alpha and/or SST activation patterns. Follicular phases were synchronized with progesterone vaginal pessaries, and control animals were killed at 0, 16, 31, and 40 h (n = 4-6/group) after progesterone withdrawal (PW [time 0]). At 28 h, other animals received LPS (100 ng/kg) and were subsequently killed at 31 h or 40 h (n = 5/group). Hypothalamic sections were immunostained for c-Fos and ER alpha or SST. LH surges occurred only in control ewes with onset at 36.7 ± 1.3 h after PW; these animals had a marked increase in the percentage of ER alpha cells that colocalized c-Fos (%ER alpha/c-Fos) in the ARC and mPOA from 31 h after PW and throughout the LH surge. In the VMN, %ER alpha/c-Fos was higher in animals that expressed sexual behavior than in those that did not. SST cell activation in the ARC and VMN was greater during the LH surge than in other stages in the follicular phase. At 31 or 40 h after PW (i.e., 3 or 12 h after treatment, respectively), LPS decreased %ER alpha/c-Fos in the ARC and the mPOA, but there was no change in the VMN compared to that in controls. The %SST/c-Fos increased in the VMN at 31 h after PW (i.e., 3 h after LPS) with no change in the ARC compared to controls. These results indicate that there is a distinct temporal pattern of ER alpha cell activation in the hypothalamus during the follicular phase, which begins in the ARC and mPOA at least 6-7 h before the LH surge onset and extends to the VMN after the onset of sexual behavior and LH surge. Furthermore, during the surge, some of these ER alpha-activated cells may be SST-secreting cells. This pattern is markedly altered by LPS administered during the late follicular phase, indicating that the disruptive effects of this stressor are mediated by suppressing ER alpha cell activation at the level of the mPOA and ARC and enhancing SST cell activation in the VMN, leading to the attenuation of the LH surge.
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Affiliation(s)
- Chrysanthi Fergani
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Wirral, United Kingdom
| | - Jean E Routly
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Wirral, United Kingdom
| | - David N Jones
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Wirral, United Kingdom
| | - Lucy C Pickavance
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Wirral, United Kingdom
| | - Robert F Smith
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Wirral, United Kingdom
| | - Hilary Dobson
- School of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, Wirral, United Kingdom
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41
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Coyne LA, Pinchbeck GL, Williams NJ, Smith RF, Dawson S, Pearson RB, Latham SM. Understanding antimicrobial use and prescribing behaviours by pig veterinary surgeons and farmers: a qualitative study. Vet Rec 2014; 175:593. [PMID: 25200432 DOI: 10.1136/vr.102686] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Increasing awareness of bacterial antimicrobial resistance in human beings and veterinary medicine has raised concerns over the issue of overprescribing and the indiscriminate use of antimicrobials. Their use in food-producing animals is under scrutiny due to the perceived risk from the zoonotic transfer of resistant pathogens from animals to human beings. This study used focus groups to explore the drivers and motivators behind antimicrobial use and prescribing by veterinary surgeons and farmers in the pig industry in the UK. Studies of two veterinary and four farmer focus groups were undertaken, each with between three and six participants, in three geographically distinct regions of low, moderate and high pig density in England. Thematic analysis of the focus group transcriptions revealed convergent themes, both within and across, the veterinary and farmer focus groups. Veterinary opinion was such that 'external pressures', such as pressure from clients, legislation and public perception, were considered to strongly influence prescribing behaviour, whereas, farmers considered issues surrounding farming systems and management to be greater drivers towards antimicrobial use. Acquiring such in-depth insight into the antimicrobial prescribing behaviours in veterinary medicine provides more detailed understanding of prescribing practice and will aid the development of interventions to promote the responsible use of antimicrobials.
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Affiliation(s)
- L A Coyne
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - G L Pinchbeck
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - N J Williams
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - R F Smith
- Faculty of Health and Life Sciences, School of Veterinary Science, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - S Dawson
- Faculty of Health and Life Sciences, School of Veterinary Science, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
| | - R B Pearson
- The George Pig Practice, High Street, Malmesbury, Wiltshire SN16 9AU, UK
| | - S M Latham
- Department of Epidemiology and Population Health, Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Chester High Road, Neston CH64 7TE, UK
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42
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Smith RF, Eggert JH, Jeanloz R, Duffy TS, Braun DG, Patterson JR, Rudd RE, Biener J, Lazicki AE, Hamza AV, Wang J, Braun T, Benedict LX, Celliers PM, Collins GW. Ramp compression of diamond to five terapascals. Nature 2014. [PMID: 25030170 DOI: 10.1038/nature13526.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The recent discovery of more than a thousand planets outside our Solar System, together with the significant push to achieve inertially confined fusion in the laboratory, has prompted a renewed interest in how dense matter behaves at millions to billions of atmospheres of pressure. The theoretical description of such electron-degenerate matter has matured since the early quantum statistical model of Thomas and Fermi, and now suggests that new complexities can emerge at pressures where core electrons (not only valence electrons) influence the structure and bonding of matter. Recent developments in shock-free dynamic (ramp) compression now allow laboratory access to this dense matter regime. Here we describe ramp-compression measurements for diamond, achieving 3.7-fold compression at a peak pressure of 5 terapascals (equivalent to 50 million atmospheres). These equation-of-state data can now be compared to first-principles density functional calculations and theories long used to describe matter present in the interiors of giant planets, in stars, and in inertial-confinement fusion experiments. Our data also provide new constraints on mass-radius relationships for carbon-rich planets.
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Affiliation(s)
- R F Smith
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - J H Eggert
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - R Jeanloz
- Department of Earth and Planetary Science, Department of Astronomy and Miller Institute for Basic Research in Science, University of California, Berkeley, California 94720, USA
| | - T S Duffy
- Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
| | - D G Braun
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - J R Patterson
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - R E Rudd
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - J Biener
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - A E Lazicki
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - A V Hamza
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - J Wang
- Department of Earth and Planetary Science, Department of Astronomy and Miller Institute for Basic Research in Science, University of California, Berkeley, California 94720, USA
| | - T Braun
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - L X Benedict
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - P M Celliers
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
| | - G W Collins
- Lawrence Livermore National Laboratory, PO Box 808, Livermore, California 94550, USA
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Erskine DJ, Smith RF, Bolme CA, Ali SJ, Celliers PM, Collins GW. Holographic and time-resolving ability of pulse-pair two-dimensional velocity interferometry. Rev Sci Instrum 2014; 85:063115. [PMID: 24985807 DOI: 10.1063/1.4884880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Previous velocity interferometers used at research laboratories for shock physics experiments measured target motion at a point or many points on a line on the target. Recently, a two-dimensional (2d) version (2d-velocity interferometer system for any reflector) has been demonstrated using a pair of ultrashort (3 ps) pulses for illumination, separated by 268 ps. We have discovered new abilities for this instrument, by treating the complex output image as a hologram. For data taken in an out of focus configuration, we can Fourier process to bring narrow features such as cracks into sharp focus, which are otherwise completely blurred. This solves a practical problem when using high numerical aperture optics having narrow depth of field to observe moving surface features such as cracks. Furthermore, theory predicts that the target appearance (position and reflectivity) at two separate moments in time are recorded by the main and conjugate images of the same hologram, and are partially separable during analysis for narrow features. Hence, for the cracks we bring into refocus, we can make a two-frame movie with a subnanosecond frame period. Longer and shorter frame periods are possible with different interferometer delays. Since the megapixel optical detectors we use have superior spatial resolution over electronic beam based framing cameras, this technology could be of great use in studying microscopic three-dimensional-behavior of targets at ultrafast times scales. Demonstrations on shocked silicon are shown.
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Affiliation(s)
- David J Erskine
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - R F Smith
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - C A Bolme
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - S J Ali
- Department of Chemistry, University of California, Berkeley, California 94720, USA
| | - P M Celliers
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - G W Collins
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
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Singh SB, Kaelin DE, Wu J, Miesel L, Tan CM, Meinke PT, Olsen D, Lagrutta A, Bradley P, Lu J, Patel S, Rickert KW, Smith RF, Soisson S, Wei C, Fukuda H, Kishii R, Takei M, Fukuda Y. Oxabicyclooctane-linked novel bacterial topoisomerase inhibitors as broad spectrum antibacterial agents. ACS Med Chem Lett 2014; 5:609-14. [PMID: 24900889 DOI: 10.1021/ml500069w] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 03/12/2014] [Indexed: 01/18/2023] Open
Abstract
Bacterial resistance is eroding the clinical utility of existing antibiotics necessitating the discovery of new agents. Bacterial type II topoisomerase is a clinically validated, highly effective, and proven drug target. This target is amenable to inhibition by diverse classes of inhibitors with alternative and distinct binding sites to quinolone antibiotics, thus enabling the development of agents that lack cross-resistance to quinolones. Described here are novel bacterial topoisomerase inhibitors (NBTIs), which are a new class of gyrase and topo IV inhibitors and consist of three distinct structural moieties. The substitution of the linker moiety led to discovery of potent broad-spectrum NBTIs with reduced off-target activity (hERG IC50 > 18 μM) and improved physical properties. AM8191 is bactericidal and selectively inhibits DNA synthesis and Staphylococcus aureus gyrase (IC50 = 1.02 μM) and topo IV (IC50 = 10.4 μM). AM8191 showed parenteral and oral efficacy (ED50) at less than 2.5 mg/kg doses in a S. aureus murine infection model. A cocrystal structure of AM8191 bound to S. aureus DNA-gyrase showed binding interactions similar to that reported for GSK299423, displaying a key contact of Asp83 with the basic amine at position-7 of the linker.
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Affiliation(s)
- Sheo B. Singh
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - David E. Kaelin
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Jin Wu
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Lynn Miesel
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Christopher M. Tan
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Peter T. Meinke
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - David Olsen
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | - Armando Lagrutta
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | - Prudence Bradley
- Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Jun Lu
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | - Sangita Patel
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | - Keith W. Rickert
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | - Robert F. Smith
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | - Stephen Soisson
- Merck Research Laboratories, West Point, Pennsylvania 19486, United States
| | | | - Hideyuki Fukuda
- Kyorin Pharmaceutical Co., Ltd., 2399-1, Nogi,
Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Ryuta Kishii
- Kyorin Pharmaceutical Co., Ltd., 2399-1, Nogi,
Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Masaya Takei
- Kyorin Pharmaceutical Co., Ltd., 2399-1, Nogi,
Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
| | - Yasumichi Fukuda
- Kyorin Pharmaceutical Co., Ltd., 2399-1, Nogi,
Nogi-machi, Shimotsuga-gun, Tochigi 329-0114, Japan
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Fergani C, Routly JE, Jones DN, Pickavance LC, Smith RF, Dobson H. Kisspeptin, c-Fos and CRFR type 2 co-expression in the hypothalamus after insulin-induced hypoglycaemia. Reprod Domest Anim 2014; 49:433-40. [PMID: 24716653 DOI: 10.1111/rda.12293] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2013] [Accepted: 01/21/2014] [Indexed: 11/27/2022]
Abstract
Normal reproductive function is dependent upon availability of glucose and insulin-induced hypoglycaemia is a metabolic stressor known to disrupt the ovine oestrous cycle. We have recently shown that IIH has the ability to delay the LH surge of intact ewes. In the present study, we examined brain tissue to determine: (i) which hypothalamic regions are activated with respect to IIH and (ii) the effect of IIH on kisspeptin cell activation and CRFR type 2 immunoreactivity, all of which may be involved in disruptive mechanisms. Follicular phases were synchronized with progesterone vaginal pessaries and at 28 h after progesterone withdrawal (PW), animals received saline (n = 6) or insulin (4 IU/kg; n = 5) and were subsequently killed at 31 h after PW (i.e., 3 h after insulin administration). Peripheral hormone concentrations were evaluated, and hypothalamic sections were immunostained for either kisspeptin and c-Fos (a marker of neuronal activation) or CRFR type 2. Within 3 h of treatment, cortisol concentrations had increased whereas plasma oestradiol concentrations decreased in peripheral plasma (p < 0.05 for both). In the arcuate nucleus (ARC), insulin-treated ewes had an increased expression of c-Fos. Furthermore, the percentage of kisspeptin cells co-expressing c-Fos increased in the ARC (from 11 to 51%; p < 0.05), but there was no change in the medial pre-optic area (mPOA; 14 vs 19%). CRFR type 2 expression in the lower part of the ARC and the median eminence was not altered by insulin treatment. Thus, disruption of the LH surge after IIH in the follicular phase is not associated with decreased kisspeptin cell activation or an increase in CRFR type 2 in the ARC but may involve other cell types located in the ARC nucleus which are activated in response to IIH.
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Affiliation(s)
- C Fergani
- School of Veterinary Science, University of Liverpool, Neston, UK
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Falco AM, McDonald CG, Smith RF. Anxiety status affects nicotine- and baclofen-induced locomotor activity, anxiety, and single-trial conditioned place preference in male adolescent rats. Dev Psychobiol 2014; 56:1352-64. [PMID: 24719177 DOI: 10.1002/dev.21217] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [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: 06/24/2013] [Accepted: 03/18/2014] [Indexed: 11/07/2022]
Abstract
Adolescents have an increased vulnerability to nicotine and anxiety may play a role in the development of nicotine abuse. One possible treatment for anxiety disorders and substance abuse is the GABAB agonist, baclofen. The aim of the present study was to determine the effect of anxiety-like behavior on single-trial nicotine conditioned place preference in adolescent rats, and to assess the action of baclofen. Baclofen was shown to have effects on locomotor and anxiety-like behavior in rats divided into high-anxiety and low-anxiety groups. Baclofen decreased locomotor behavior in high-anxiety rats. Baclofen alone failed to produce differences in anxiety-like behavior, but nicotine and baclofen + nicotine administration were anxiolytic. High- and low-anxiety groups also showed differences in single-trial nicotine-induced place preference. Only high-anxiety rats formed place preference to nicotine, while rats in the low-anxiety group formed no conditioned place preference. These results suggest that among adolescents, high-anxiety individuals are more likely to show preference for nicotine than low-anxiety individuals.
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Affiliation(s)
- Adriana M Falco
- Department of Psychology, George Mason University, MSN 3F5, Fairfax, VA, 22030
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MacFarlane JA, Grove-White DH, Royal MD, Smith RF. Use of plasma samples to assess passive transfer in calves using refractometry: comparison with serum and clinical cut-off point. Vet Rec 2014; 174:303. [PMID: 24570407 DOI: 10.1136/vr.102228] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- J A MacFarlane
- School of Veterinary Sciences, University of Bristol, Langford, Bristol, Somerset BS40 5DU, UK
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Falco AM, McDonald CG, Bachus SE, Smith RF. Developmental alterations in locomotor and anxiety-like behavior as a function of D1 and D2 mRNA expression. Behav Brain Res 2013; 260:25-33. [PMID: 24239691 DOI: 10.1016/j.bbr.2013.11.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 10/30/2013] [Accepted: 11/06/2013] [Indexed: 12/27/2022]
Abstract
The majority of smokers start smoking in adolescence, beginning a potentially lifelong struggle with nicotine use and abuse. In rodent models of the effects of nicotine, the drug has been shown to elicit both locomotor and anxiety-like behavioral effects. Research suggests that these behavioral effects may be due in part to dopamine (DA) receptors D1 and D2 in the mesolimbic system, specifically the nucleus accumbens (NAc). We examined early adolescent (P28), late adolescent (P45), and adult (P80) male Long-Evans rats in the elevated plus maze (EPM) under normal conditions and the open field (OF) post-nicotine in order to test locomotor and anxiety-like behavior. These behavioral findings were then correlated with expression of DA D1 and D2 mRNA levels as determined via in situ hybridization. Nicotine-induced locomotor behavior was found to be significantly different between age groups. After a single injection of nicotine, early adolescents exhibited increases in locomotor behavior, whereas both late adolescents and adults responded with decreases in locomotor behavior. In addition, it was found that among, early adolescents, open arm and center time in the EPM were negatively correlated with D2 mRNA expression. In contrast, among adults, distance traveled in the center and center time in the OF were negatively correlated with D2 mRNA expression. This study suggests that DA D2 receptors play a role in anxiety-like behavior and that the relationship between observed anxiety-like behaviors and D2 receptor expression changes through the lifespan.
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Affiliation(s)
- A M Falco
- Department of Psychology, George Mason University, United States.
| | - C G McDonald
- Department of Psychology, George Mason University, MSN 3F5, Fairfax, VA 22030, United States.
| | - S E Bachus
- Department of Psychology, George Mason University, MSN 3F5, Fairfax, VA 22030, United States.
| | - R F Smith
- Department of Psychology, George Mason University, MSN 3F5, Fairfax, VA 22030, United States.
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50
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King SG, Dobson H, Royal MD, Christley RM, Murray RD, Routly JE, Smith RF, Mann GE. Identification of inadequate maternal progesterone concentrations in nulliparous dairy heifers and treatment with human chorionic gonadotrophin. Vet Rec 2013; 173:450. [PMID: 24128945 DOI: 10.1136/vr.101330] [Citation(s) in RCA: 3] [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] [Indexed: 11/04/2022]
Abstract
Plasma progesterone concentrations were estimated for 381 nulliparous dairy heifers from eight farms on days 4-6 after insemination. Heifers were synchronised using two treatments of prostaglandin F2α (PGF2α) 11 days apart. Alternate heifers were treated with 1500 IU human chorionic gonadotrophin (hCG) at the time of sampling, and the pregnancy status assessed ~35 days after insemination. Heifers with no corpus luteum (CL; n-30) at the second PGF2α had lower progesterone concentrations (P<0.001) and pregnancy rates (PR; P=0.001) compared with heifers with CL (n=351, defined as cyclic). The risk of no CL increased in heifers <15 months of age (OR=7.5, P<0.001) and with body condition score <2.5 (OR=4.5, P=0.001). Those with no CL were removed from further analysis. The 20 per cent cyclic control heifers with progesterone concentrations ≤2 ng/ml on days 4-6 had lower PRs compared with those with higher concentrations (42 per cent vs 64 per cent, OR=0.3, P=0.01). There was no overall effect of hCG on PR compared with controls (51 per cent vs 60 per cent, P=0.10). However, heifers with high progesterone on days 4-6 (>2 ng/ml) had a lower PR after treatment (51 per cent vs 64 per cent, OR=0.6, P=0.02). Heifers inseminated with sexed (n=18) compared with conventional (n=333) semen had a decreased PR (33 per cent vs 57 per cent, OR=0.2, P=0.01). This study demonstrates that higher plasma progesterone concentrations as early as days 4-6 after insemination have a positive effect on first insemination PR, but there was no beneficial effect of hCG treatment on these days in dairy heifers.
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Affiliation(s)
- S G King
- Lambert, Leonard & May, Old Woodhouses, Broughall, Whitchurch, Shropshire SY13 4AQ, UK
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