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Pollock C, Pardo F, Imboden M, Bishop DJ. Open loop control theory algorithms for high-speed 3D MEMS optical switches. Opt Express 2020; 28:2010-2019. [PMID: 32121900 DOI: 10.1364/oe.367554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
There is a world-wide push to create the next-generation all-optical transmission and switching technologies for exascale data centers. In this paper we focus on the switching fabrics. Many different types of 2D architectures are being explored including MEMS/waveguides and semiconductor optical amplifiers. However, these tend to suffer from high, path-dependent losses and crosstalk issues. The technologies with the best optical properties demonstrated to date in large fabrics (>100 ports) are 3D MEMS beam steering approaches. These have low average insertion losses and, equally important, a narrow loss distribution. However, 3D MEMS fabrics are generally dismissed from serious consideration for this application because of their slow switching speeds (∼few milliseconds) and high costs ($100/port). In this paper we show how novel feedforward open loop controls can solve both problems by improving MEMS switching speeds by two orders of magnitude and costs by a factor of three. With these improvements in hand, we believe 3D MEMS fabrics can become the technology of choice for data centers.
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2
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Ferreira GA, Felippe LC, Bertuzzi R, Bishop DJ, Ramos IS, De-Oliveira FR, Lima-Silva AE. Does caffeine ingestion before a short-term sprint interval training promote body fat loss? Braz J Med Biol Res 2019; 52:e9169. [PMID: 31826183 PMCID: PMC6903805 DOI: 10.1590/1414-431x20199169] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 10/08/2019] [Indexed: 12/12/2022] Open
Abstract
We investigated the effect of caffeine ingestion combined with a 2-wk sprint interval training (SIT) on training-induced reductions in body adiposity. Twenty physically-active men ingested either 5 mg/kg of cellulose as a placebo (PLA, n=10) or 5 mg/kg of caffeine (CAF, n=10) 60 min before each SIT session (13×30 s sprint/15 s of rest). Body mass and skinfold thickness were measured pre- and post-training. Energy expenditure was measured at rest, during exercise, and 45 min after exercise in the first SIT session. Body fat was similar between PLA and CAF groups at pre-training (P>0.05). However, there was a significant decrease in body fat after training in the CAF group (−5.9±4.2%, P<0.05) but not in PLA (1.5±8.0%, P>0.05). There was no difference in energy expenditure at rest and during exercise between PLA and CAF groups (P>0.05), but the post-exercise energy expenditure was 18.3±21.4% greater in the CAF than in the PLA group (P<0.05). In conclusion, caffeine ingestion before SIT sessions induced a body fat loss that may be associated with higher post-exercise energy expenditure.
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Affiliation(s)
- G A Ferreira
- Grupo de Pesquisa em Ciências dos Esportes, Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Vitória de Santo Antão, PE, Brasil
| | - L C Felippe
- Grupo de Pesquisa em Ciências dos Esportes, Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Vitória de Santo Antão, PE, Brasil
| | - R Bertuzzi
- Grupo de Estudos em Desempenho Aeróbio da USP, Escola de Educação Física e Esporte, Universidade de São Paulo, São Paulo, SP, Brasil
| | - D J Bishop
- Institute for Health and Sport, Victoria University, Melbourne, Australia.,School of Medical and Health Sciences, Edith Cowan University, Perth, Australia
| | - I S Ramos
- Grupo de Pesquisa em Ciências dos Esportes, Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Vitória de Santo Antão, PE, Brasil
| | - F R De-Oliveira
- Núcleo de Estudos do Movimento Humano, Departamento de Educação Física, Universidade Federal de Lavras, Lavras, MG, Brasil
| | - A E Lima-Silva
- Grupo de Pesquisa em Ciências dos Esportes, Centro Acadêmico de Vitória, Universidade Federal de Pernambuco, Vitória de Santo Antão, PE, Brasil.,Grupo de Pesquisa em Performance Humana, Universidade Tecnológica Federal do Paraná, Curitiba, PR, Brasil
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3
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Papadimitriou ID, Eynon N, Yan X, Munson F, Jacques M, Kuang J, Voisin S, North KN, Bishop DJ. A "human knockout" model to investigate the influence of the α-actinin-3 protein on exercise-induced mitochondrial adaptations. Sci Rep 2019; 9:12688. [PMID: 31481717 PMCID: PMC6722100 DOI: 10.1038/s41598-019-49042-y] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 08/06/2019] [Indexed: 11/09/2022] Open
Abstract
Research in α-actinin-3 knockout mice suggests a novel role for α-actinin-3 as a mediator of cell signalling. We took advantage of naturally-occurring human “knockouts” (lacking α-actinin-3 protein) to investigate the consequences of α-actinin-3 deficiency on exercise-induced changes in mitochondrial-related genes and proteins, as well as endurance training adaptations. At baseline, we observed a compensatory increase of α-actinin-2 protein in ACTN3 XX (α-actinin-3 deficient; n = 18) vs ACTN3 RR (expressing α-actinin-3; n = 19) participants but no differences between genotypes for markers of aerobic fitness or mitochondrial content and function. There was a main effect of genotype, without an interaction, for RCAN1-4 protein content (a marker of calcineurin activity). However, there was no effect of genotype on exercise-induced expression of genes associated with mitochondrial biogenesis, nor post-training physiological changes. In contrast to results in mice, loss of α-actinin-3 is not associated with higher baseline endurance-related phenotypes, or greater adaptations to endurance exercise training in humans.
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Affiliation(s)
- I D Papadimitriou
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia.,Department of Physiology, Mahidol University, Bangkok, Thailand
| | - N Eynon
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia.,Murdoch Children's Research Institute, Melbourne, Australia
| | - X Yan
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia
| | - F Munson
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia
| | - M Jacques
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia
| | - J Kuang
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia
| | - S Voisin
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia
| | - K N North
- Murdoch Children's Research Institute, Melbourne, Australia
| | - D J Bishop
- Institute for Health and Sport (iHeS), Victoria University, Melbourne, Australia. .,School of Medical & Health Sciences, Edith Cowan University, Joondalup, Australia.
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Pollock C, Javor J, Stange A, Barrett LK, Bishop DJ. Extreme angle, tip-tilt MEMS micromirror enabling full hemispheric, quasi-static optical coverage. Opt Express 2019; 27:15318-15326. [PMID: 31163729 DOI: 10.1364/oe.27.015318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Accepted: 05/01/2019] [Indexed: 06/09/2023]
Abstract
Beam steering is essential for a variety of optical applications such as communication, LIDAR, and imaging. Microelectromechanical system (MEMS) mirrors are an effective method of achieving modest speeds and angular range at low cost. Typically there are a number of tradeoffs considered when designing a tip-tilt mirror, such as tilt angle and speed. For example, many mirrors are designed to scan at their resonant frequency to achieve large angles. This is effective for a scanning mode; however, this makes the device slow and ineffective as a galvo (quasi-static). Here, we present a magnetic MEMS mirror with extreme quasi-static mechanical tilt angles of ±60° (±120° optical) about two rotation axes. This micromirror enables full hemispheric optical coverage without compromising speed; settling in 4.5 ms using advanced drive techniques. This mirror will enable new applications for MEMS micromirrors previously thought impossible due to their limited angular range and speed.
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Christiansen D, Murphy RM, Bangsbo J, Stathis CG, Bishop DJ. Increased FXYD1 and PGC-1α mRNA after blood flow-restricted running is related to fibre type-specific AMPK signalling and oxidative stress in human muscle. Acta Physiol (Oxf) 2018; 223:e13045. [PMID: 29383885 PMCID: PMC5969286 DOI: 10.1111/apha.13045] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/01/2018] [Accepted: 01/24/2018] [Indexed: 12/24/2022]
Abstract
Aim This study explored the effects of blood flow restriction (BFR) on mRNA responses of PGC‐1α (total, 1α1, and 1α4) and Na+,K+‐ATPase isoforms (NKA; α1‐3, β1‐3, and FXYD1) to an interval running session and determined whether these effects were related to increased oxidative stress, hypoxia, and fibre type‐specific AMPK and CaMKII signalling, in human skeletal muscle. Methods In a randomized, crossover fashion, 8 healthy men (26 ± 5 year and 57.4 ± 6.3 mL kg−1 min−1) completed 3 exercise sessions: without (CON) or with blood flow restriction (BFR), or in systemic hypoxia (HYP, ~3250 m). A muscle sample was collected before (Pre) and after exercise (+0 hour, +3 hours) to quantify mRNA, indicators of oxidative stress (HSP27 protein in type I and II fibres, and catalase and HSP70 mRNA), metabolites, and α‐AMPK Thr172/α‐AMPK, ACC Ser221/ACC, CaMKII Thr287/CaMKII, and PLBSer16/PLB ratios in type I and II fibres. Results Muscle hypoxia (assessed by near‐infrared spectroscopy) was matched between BFR and HYP, which was higher than CON (~90% vs ~70%; P < .05). The mRNA levels of FXYD1 and PGC‐1α isoforms (1α1 and 1α4) increased in BFR only (P < .05) and were associated with increases in indicators of oxidative stress and type I fibre ACC Ser221/ACC ratio, but dissociated from muscle hypoxia, lactate, and CaMKII signalling. Conclusion Blood flow restriction augmented exercise‐induced increases in muscle FXYD1 and PGC‐1α mRNA in men. This effect was related to increased oxidative stress and fibre type‐dependent AMPK signalling, but unrelated to the severity of muscle hypoxia, lactate accumulation, and modulation of fibre type‐specific CaMKII signalling.
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Affiliation(s)
- D. Christiansen
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
| | - R. M. Murphy
- Department of Biochemistry and Genetics; La Trobe Institute for Molecular Science; La Trobe University; Melbourne Vic. Australia
| | - J. Bangsbo
- Department of Nutrition, Exercise and Sports (NEXS); University of Copenhagen; Copenhagen N Denmark
| | - C. G. Stathis
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
| | - D. J. Bishop
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
- School of Medical and Health Sciences; Edith Cowan University; Perth WA Australia
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6
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Silva R, Damasceno M, Cruz R, Silva-Cavalcante MD, Lima-Silva AE, Bishop DJ, Bertuzzi R. Effects of a 4-week high-intensity interval training on pacing during 5-km running trial. ACTA ACUST UNITED AC 2017; 50:e6335. [PMID: 29069224 PMCID: PMC5649866 DOI: 10.1590/1414-431x20176335] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 07/10/2017] [Indexed: 11/22/2022]
Abstract
This study analyzed the influence of a 4-week high-intensity interval training on the pacing strategy adopted by runners during a 5-km running trial. Sixteen male recreational long-distance runners were randomly assigned to a control group (CON, n=8) or a high-intensity interval training group (HIIT, n=8). The HIIT group performed high-intensity interval-training twice per week, while the CON group maintained their regular training program. Before and after the training period, the runners performed an incremental exercise test to exhaustion to measure the onset of blood lactate accumulation, maximal oxygen uptake (VO2max), and peak treadmill speed (PTS). A submaximal constant-speed test to measure the running economy (RE) and a 5-km running trial on an outdoor track to establish pacing strategy and performance were also done. During the 5-km running trial, the rating of perceived exertion (RPE) and time to cover the 5-km trial (T5) were registered. After the training period, there were significant improvements in the HIIT group of ∼7 and 5% for RE (P=0.012) and PTS (P=0.019), respectively. There was no significant difference between the groups for VO2max (P=0.495) or onset of blood lactate accumulation (P=0.101). No difference was found in the parameters measured during the 5-km trial before the training period between HIIT and CON (P>0.05). These findings suggest that 4 weeks of HIIT can improve some traditional physiological variables related to endurance performance (RE and PTS), but it does not alter the perception of effort, pacing strategy, or overall performance during a 5-km running trial.
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Affiliation(s)
- R Silva
- Grupo de Estudos do Desempenho Aeróbio (GEADE-USP), Departamento de Esportes Escola de Educação Física e Esportes, Universidade de São Paulo, São Paulo, Brasil
| | - M Damasceno
- Grupo de Estudos do Desempenho Aeróbio (GEADE-USP), Departamento de Esportes Escola de Educação Física e Esportes, Universidade de São Paulo, São Paulo, Brasil
| | - R Cruz
- Grupo de Estudos do Desempenho Aeróbio (GEADE-USP), Departamento de Esportes Escola de Educação Física e Esportes, Universidade de São Paulo, São Paulo, Brasil
| | - M D Silva-Cavalcante
- Grupo de Estudos do Desempenho Aeróbio (GEADE-USP), Departamento de Esportes Escola de Educação Física e Esportes, Universidade de São Paulo, São Paulo, Brasil.,Grupo de Pesquisa em Ciência do Esporte, Faculdade de Nutrição, Universidade Federal de Pernambuco, Pernambuco, Brasil
| | - A E Lima-Silva
- Grupo de Pesquisa em Ciência do Esporte, Faculdade de Nutrição, Universidade Federal de Pernambuco, Pernambuco, Brasil.,Grupo de Pesquisa em Desempenho Humano, Universidade Tecnológica Federal do Paraná, Paraná, Brasil
| | - D J Bishop
- Institute of Sport, Exercise and Active Living, Victoria University, Melbourne, Victoria, Australia.,School of Medical and Health Sciences, Edith Cowan University, Perth, Australia
| | - R Bertuzzi
- Grupo de Estudos do Desempenho Aeróbio (GEADE-USP), Departamento de Esportes Escola de Educação Física e Esportes, Universidade de São Paulo, São Paulo, Brasil
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7
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Pollock C, Morrison J, Imboden M, Little TDC, Bishop DJ. Beam shaping with tip-tilt varifocal mirror for indoor optical wireless communication. Opt Express 2017; 25:20274-20285. [PMID: 29041710 DOI: 10.1364/oe.25.020274] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 08/03/2017] [Indexed: 06/07/2023]
Abstract
MEMS mirrors are currently used in many applications to steer beams of light. An area of continued research is developing mirrors with varifocal capability that allows the beam to be shaped and focused. In this work, we study the varifocal capability of a 380 μm diameter, thermally actuated MEMS mirror with a ± 40° tip-tilt angle and a radius of curvature between -0.48 mm to 20.5 mm. Light is coupled to the mirror via a single mode optical fiber, similar to an indoor optical wireless communication architecture. The performance of the mirror is characterized with respect to (1) the profile of the reflected beam as the mirror deforms and (2) the mirror's impact when integrated into an optical communication system. We found that the mirror can focus light to a beam with a 0.18° half-angle divergence. Additionally, the ability to change the shape of fiberized light from a wide to narrow beam provides an unmatched level of dynamic control and significantly improves the bit error rate in an optical communication system.
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8
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Affiliation(s)
- O. Girard
- ISSUL; Institute of Sport Sciences; Department of Physiology; Faculty of Biology and Medicine; University of Lausanne; Lausanne Switzerland
| | - F. Brocherie
- ISSUL; Institute of Sport Sciences; Department of Physiology; Faculty of Biology and Medicine; University of Lausanne; Lausanne Switzerland
| | - D. J. Bishop
- Institute of Sport; Exercise and Active Living (ISEAL); College of Sport and Exercise Science; Victoria University; Melbourne Victoria Australia
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9
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Morrison J, Imboden M, Little TDC, Bishop DJ. Electrothermally actuated tip-tilt-piston micromirror with integrated varifocal capability. Opt Express 2015; 23:9555-66. [PMID: 25968784 DOI: 10.1364/oe.23.009555] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
MEMS micromirrors have proven to be very important optical devices with applications ranging from steerable mirrors for switches and cross-connects to spatial light modulators for correcting optical distortions. Usually beam steering and focusing are done with different MEMS devices and tilt angles in excess of 10 degrees are seldom obtained. Here we describe a single MEMS device that combines tip/tilt, piston mode and varifocal capability into a single, low cost device with very large tilt angles. Our device consists of a 400 micron diameter mirror driven with thermal bimorphs. We have demonstrated deflection angles of ± 40 degrees along both axes, a tunable focal length which varies between -0.48 mm to + 20.5 mm and a piston mode range of 300 microns - four separately controllable degrees of freedom in a single device. Potential applications range from smart lighting to optical switches and devices for telecom systems.
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10
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Wyckelsma VL, McKenna MJ, Serpiello FR, Lamboley CR, Aughey RJ, Stepto NK, Bishop DJ, Murphy RM. Single-fiber expression and fiber-specific adaptability to short-term intense exercise training of Na+-K+-ATPase α- and β-isoforms in human skeletal muscle. J Appl Physiol (1985) 2015; 118:699-706. [PMID: 25614596 DOI: 10.1152/japplphysiol.00419.2014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The Na(+)-K(+)-ATPase (NKA) plays a key role in muscle excitability, but little is known in human skeletal muscle about fiber-type-specific differences in NKA isoform expression or adaptability. A vastus lateralis muscle biopsy was taken in 17 healthy young adults to contrast NKA isoform protein relative abundance between type I and IIa fibers. We further investigated muscle fiber-type-specific NKA adaptability in eight of these adults following 4-wk repeated-sprint exercise (RSE) training, comprising three sets of 5 × 4-s sprints, 3 days/wk. Single fibers were separated, and myosin heavy chain (I and IIa) and NKA (α1-3 and β1-3) isoform abundance were determined via Western blotting. All six NKA isoforms were expressed in both type I and IIa fibers. No differences between fiber types were found for α1-, α2-, α3-, β1-, or β3-isoform abundances. The NKA β2-isoform was 27% more abundant in type IIa than type I fibers (P < 0.05), with no other fiber-type-specific trends evident. RSE training increased β1 in type IIa fibers (pretraining 0.70 ± 0.25, posttraining 0.84 ± 0.24 arbitrary units, 42%, P < 0.05). No training effects were found for other NKA isoforms. Thus human skeletal muscle expresses all six NKA isoforms and not in a fiber-type-specific manner; this points to their different functional roles in skeletal muscle cells. Detection of elevated NKA β1 after RSE training demonstrates the sensitivity of the single-fiber Western blotting technique for fiber-type-specific intervention effects.
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Affiliation(s)
- V L Wyckelsma
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - M J McKenna
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - F R Serpiello
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - C R Lamboley
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - R J Aughey
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - N K Stepto
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - D J Bishop
- Institute of Sport, Exercise and Active Living (ISEAL), Victoria University, Melbourne, Victoria, Australia; and
| | - R M Murphy
- Department of Biochemistry, La Trobe University, Melbourne, Victoria, Australia
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11
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Voisin S, Eynon N, Yan X, Bishop DJ. Exercise training and DNA methylation in humans. Acta Physiol (Oxf) 2015; 213:39-59. [PMID: 25345837 DOI: 10.1111/apha.12414] [Citation(s) in RCA: 154] [Impact Index Per Article: 17.1] [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: 04/26/2014] [Revised: 06/14/2014] [Accepted: 10/18/2014] [Indexed: 12/17/2022]
Abstract
The response to exercise training (trainability) has been shown to have a strong heritable component. There is growing evidence suggesting that traits such as trainability do not only depend on the genetic code, but also on epigenetic signals. Epigenetic signals play an important role in the modulation of gene expression, through mechanisms such as DNA methylation and histone modifications. There is an emerging evidence to show that physical activity influences DNA methylation in humans. The present review aims to summarize current knowledge on the link between DNA methylation and physical activity in humans. We have critically reviewed the literature and only papers focused on physical activity and its influence on DNA methylation status were included; a total of 25 papers were selected. We concluded that both acute and chronic exercises significantly impact DNA methylation, in a highly tissue- and gene-specific manner. This review also provides insights into the molecular mechanisms of exercise-induced DNA methylation changes, and recommendations for future research.
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Affiliation(s)
- S. Voisin
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
| | - N. Eynon
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
- Murdoch Childrens Research Institute; Royal Children's Hospital; Melbourne Vic. Australia
| | - X. Yan
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
- Murdoch Childrens Research Institute; Royal Children's Hospital; Melbourne Vic. Australia
| | - D. J. Bishop
- Institute of Sport, Exercise and Active Living (ISEAL); Victoria University; Melbourne Vic. Australia
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12
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Morel B, Clémençon M, Rota S, Millet GY, Bishop DJ, Brosseau O, Rouffet DM, Hautier CA. Contraction velocity influence the magnitude and etiology of neuromuscular fatigue during repeated maximal contractions. Scand J Med Sci Sports 2014; 25:e432-41. [DOI: 10.1111/sms.12358] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/07/2014] [Indexed: 11/28/2022]
Affiliation(s)
- B. Morel
- Center of Research and Innovation on Sport; University of Lyon 1; Villeurbanne France
| | - M. Clémençon
- Center of Research and Innovation on Sport; University of Lyon 1; Villeurbanne France
| | - S. Rota
- Center of Research and Innovation on Sport; University of Lyon 1; Villeurbanne France
| | - G. Y. Millet
- Human Performance Laboratory; University of Calgary; Calgary Alberta Canada
| | - D. J. Bishop
- Institute of Sport, Exercise and Active Living; Victoria University; Melbourne Victoria Australia
| | - O. Brosseau
- Maison des Consultants - Médipôle; Bourgoin-Jailleux France
| | - D. M. Rouffet
- Institute of Sport, Exercise and Active Living; Victoria University; Melbourne Victoria Australia
- Australian Institute of Sport; Belconnen Australian Capital Territory Australia
| | - C. A. Hautier
- Center of Research and Innovation on Sport; University of Lyon 1; Villeurbanne France
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13
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Grove JR, Main LC, Partridge K, Bishop DJ, Russell S, Shepherdson A, Ferguson L. Training distress and performance readiness: laboratory and field validation of a brief self-report measure. Scand J Med Sci Sports 2014; 24:e483-490. [PMID: 24646366 DOI: 10.1111/sms.12214] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/15/2014] [Indexed: 11/28/2022]
Abstract
Three studies were conducted to validate the Training Distress Scale (TDS), a 19-item measure of training-related distress and performance readiness. Study 1 was a randomized, controlled laboratory experiment in which a treatment group undertook daily interval training until a 25% decrement occurred in time-to-fatigue performance. Comparisons with a control group showed that TDS scores increased over time within the treatment group but not in the control group. Study 2 was a randomized, controlled field investigation in which performance capabilities and TDS responses were compared across a high-intensity interval training group and a control group that continued normal training. Running performance decreased significantly in the training group but not in the control group, and scores on the TDS mirrored those changes in performance capabilities. Study 3 examined the relationship between TDS scores obtained over a 2-week period before major swimming competitions and subsequent performance in those competitions. Significantly, better performance was observed for swimmers with low TDS scores compared with those with moderate or high TDS scores. These findings provide both laboratory and field evidence for the validity of the TDS as a measure of short-term training distress and performance readiness.
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Affiliation(s)
- J R Grove
- School of Sport Science, Exercise & Health, The University of Western Australia, Crawley, Western Australia, Australia
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14
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Girard O, Bishop DJ, Racinais S. Hot conditions improve power output during repeated cycling sprints without modifying neuromuscular fatigue characteristics. Eur J Appl Physiol 2012; 113:359-69. [PMID: 22743981 DOI: 10.1007/s00421-012-2444-3] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2012] [Accepted: 06/13/2012] [Indexed: 11/24/2022]
Abstract
This study investigated the effect of hot conditions on repeated sprint cycling performance and post-exercise alterations in isometric knee extension function. Twelve physically active participants performed 10 × 6-s "all-out" sprints on a cycle ergometer (recovery = 30 s), followed 6 min later by 5 × 6-s sprints (recovery = 30 s) in either a neutral (24 °C/30 %rH) or a hot (35 °C/40 %rH) environment. Neuromuscular tests including voluntary and electrically evoked isometric contractions of the knee extensors were performed before and after exercise. Average core temperature during exercise was higher (38.0 ± 0.1 vs. 37.7 ± 0.1 °C, respectively; P < 0.05) in hot versus neutral environments. Peak power output decreased (-17.9 % from sprint 1 to sprint 10 and -17.0 % from sprint 11 to sprint 15; P < 0.001) across repetitions. Average peak power output during the first ten sprints was higher (+3.1 %; P < 0.01) in the hot ambient temperature condition. Maximal strength (-12 %) and rate of force development (-15 to -26 %, 30-200 ms from the onset of contraction) decreased (P < 0.001) during brief contractions after exercise, irrespectively of the ambient temperature. During brief maximal contractions, changes in voluntary activation (~80 %) were not affected by exercise or temperature. Voluntary activation declined (P < 0.01) during the sustained contraction, with these reductions being more pronounced (P < 0.05) after exercise but not affected by the ambient temperature. Resting twitch amplitude declined (P < 0.001) by ~42 %, independently of the ambient temperature. In conclusion, heat exposure has no effect on the pattern and the extent of isometric knee extensor fatigue following repeated cycling sprints in the absence of hyperthermia.
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Affiliation(s)
- Olivier Girard
- Research and Education Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
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Abstract
OBJECTIVES To investigate the effects of different swimming intensities on subsequent cycling and overall triathlon performance. METHODS Nine highly trained, male triathletes completed five separate laboratory sessions comprising one graded exercise test, a swim time trial (STT), and three sprint distance triathlons (TRI). The swimming velocities of the three TRI sessions were 80-85% (S80), 90-95% (S90), and 98-102% (S100) of the STT velocity. Subsequent cycling and running were performed at a perceived maximal intensity. Swimming stroke mechanics were measured during the swim. Plasma lactate concentration and ratings of perceived exertion were recorded at the conclusion of the swim and over the course of subsequent cycling and running. Oxygen consumption was recorded during the cycle. RESULTS The S80 and S90 cycle times were faster than the S100 cycle time (p<0.05). The overall triathlon time of S80 was faster than that of S100 (p<0.05). The S100 swim was characterised by a greater stroke rate than S80 and S90 (p<0.05) and a greater plasma lactate concentration than S80 (p<0.01). CONCLUSION A swimming intensity below that of a time trial effort significantly improves subsequent cycling and overall triathlon performance.
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Affiliation(s)
- P D Peeling
- University of Western Australia, Crawley, WA 6009, Australia.
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Abstract
The Casimir force between uncharged metallic surfaces originates from quantum-mechanical zero-point fluctuations of the electromagnetic field. We demonstrate that this quantum electrodynamical effect has a profound influence on the oscillatory behavior of microstructures when surfaces are in close proximity (< or =100 nm). Frequency shifts, hysteretic behavior, and bistability caused by the Casimir force are observed in the frequency response of a periodically driven micromachined torsional oscillator.
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Affiliation(s)
- H B Chan
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA.
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Abstract
The Casimir force is the attraction between uncharged metallic surfaces as a result of quantum mechanical vacuum fluctuations of the electromagnetic field. We demonstrate the Casimir effect in microelectromechanical systems using a micromachined torsional device. Attraction between a polysilicon plate and a spherical metallic surface results in a torque that rotates the plate about two thin torsional rods. The dependence of the rotation angle on the separation between the surfaces is in agreement with calculations of the Casimir force. Our results show that quantum electrodynamical effects play a significant role in such microelectromechanical systems when the separation between components is in the nanometer range.
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Affiliation(s)
- H B Chan
- Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA
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Eskildsen MR, Abrahamsen AB, López D, Gammel PL, Bishop DJ, Andersen NH, Mortensen K, Canfield PC. Flux line lattice reorientation in the borocarbide superconductors with H parallel a. Phys Rev Lett 2001; 86:320-323. [PMID: 11177821 DOI: 10.1103/physrevlett.86.320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2000] [Indexed: 05/23/2023]
Abstract
Small angle neutron scattering studies of the flux line lattice in LuNi2B2C and ErNi2B2C induced by a field parallel to the a axis reveal a first order flux line lattice reorientation transition. Below the transition the flux line lattice nearest neighbor direction is parallel to the b axis, and above the transition it is parallel to the c axis. This transition cannot be explained using nonlocal corrections to the London model. In addition, the anisotropy of the penetration depth lambda and the coherence length xi change at the transition.
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Paltiel Y, Zeldov E, Myasoedov Y, Rappaport ML, Jung G, Bhattacharya S, Higgins MJ, Xiao ZL, Andrei EY, Gammel PL, Bishop DJ. Instabilities and disorder-driven first-order transition of the vortex lattice. Phys Rev Lett 2000; 85:3712-3715. [PMID: 11030988 DOI: 10.1103/physrevlett.85.3712] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2000] [Indexed: 05/23/2023]
Abstract
Transport studies in a Corbino disk suggest that the Bragg glass phase undergoes a first-order transition into a disordered solid. This transition shows sharp reentrant behavior at low fields. In contrast, in the conventional strip configuration, the phase transition is obscured by the injection of the disordered vortices through the sample edges, which results in the commonly observed vortex instabilities and smearing of the peak effect in NbSe2 crystals. These features are found to be absent in the Corbino geometry in which the circulating vortices do not cross the sample edges.
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Affiliation(s)
- Y Paltiel
- Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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Gammel PL, Barber B, Lopez D, Ramirez AP, Bishop DJ, Bud'ko SL, Canfield PC. Enhanced critical currents of superconducting ErNi2B2C in the ferromagnetically ordered state. Phys Rev Lett 2000; 84:2497-2500. [PMID: 11018919 DOI: 10.1103/physrevlett.84.2497] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/1999] [Indexed: 05/23/2023]
Abstract
We report on transport and magnetization studies of the critical current in single crystal ErNi2B2C for applied fields below 4 kG. Below T approximately 2.5 K superconductivity coexists with weak ferromagnetism. We find that the critical currents are strongly enhanced for all field orientations in this ferromagnetic regime, corresponding to a threefold increase of the pinning force of the flux line lattice. We speculate that this increase is due to strong pair breaking by the ferromagnetism.
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Affiliation(s)
- PL Gammel
- Bell Laboratories, Lucent Technologies, Murray Hill, New Jersey 07974, USA
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Pardo F, de la Cruz F, Gammel PL, Bucher E, Bishop DJ. Observation of smectic and moving-Bragg-glass phases in flowing vortex lattices. Nature 1998. [DOI: 10.1038/24581] [Citation(s) in RCA: 153] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Aksyuk V, Balakirev FF, Boebinger GS, Gammel PL, Haddon RC, Bishop DJ. Micromechanical "Trampoline" magnetometers for use in large pulsed magnetic fields. Science 1998; 280:720-2. [PMID: 9563944 DOI: 10.1126/science.280.5364.720] [Citation(s) in RCA: 18] [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: 11/02/2022]
Abstract
A silicon micromechanical magnetometer was constructed and successfully used in 60-tesla pulsed magnetic fields of less than 100-millisecond duration. The device is small, inexpensive to fabricate, and easy to use. It features a fast mechanical response (up to 50,000 hertz) and extremely high sensitivity yet is relatively robust against electrical and mechanical noise. Quantum oscillations in the magnetization of a 1-microgram sample of an organic superconductor, kappa-[bis(ethylenedithio)tetrathiafulvalene]2Cu(NCS)2, have been observed with this device.
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Affiliation(s)
- V Aksyuk
- V. Aksyuk, P. L. Gammel, R. C. Haddon, D. J. Bishop, Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA. F. F. Balakirev and G. S. Boebinger, Bell Laboratories, Lucent Technologies, Murray Hill, NJ 07974, USA, and
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Eskildsen MR, Harada K, Gammel PL, Abrahamsen AB, Andersen NH, Ernst G, Ramirez AP, Bishop DJ, Mortensen K, Naugle DG, Rathnayaka KDD, Canfield PC. Intertwined symmetry of the magnetic modulation and the flux-line lattice in the superconducting state of TmNi2B2C. Nature 1998. [DOI: 10.1038/30447] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Eskildsen MR, Gammel PL, Isaacs ED, Detlefs C, Mortensen K, Bishop DJ. Compound refractive optics for the imaging and focusing of low-energy neutrons. Nature 1998. [DOI: 10.1038/35333] [Citation(s) in RCA: 95] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tunis SR, Sheinhait IA, Schmid CH, Bishop DJ, Ross SD. Lansoprazole compared with histamine2-receptor antagonists in healing gastric ulcers: a meta-analysis. Clin Ther 1997; 19:743-57. [PMID: 9377618 DOI: 10.1016/s0149-2918(97)80098-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
To compare the gastric ulcer healing rates of lansoprazole with histamine2-receptor antagonists (H2RAs) (ranitidine, famotidine, cimetidine, and roxatidine), a meta-analysis was performed using data from five published and eight unpublished randomized controlled trials. Analyses were performed using (1) both evaluable patients (n = 1527) and all randomized patients (n = 1655) (assuming that patients lost to follow-up were treatment failures); (2) all studies and a subset of studies that received high methodologic quality scores; and (3) fixed-effects, random-effects, and Bayesian statistical models. In all cases, lansoprazole was associated with a significantly higher rate of endoscopic healing at both 4 and 8 weeks compared with the H2RAs. When the most conservative Bayesian statistical model and intent-to-treat analysis were used, lansoprazole was associated with a 33% higher healing rate at 4 weeks (risk ratio = 1.33; 95% confidence interval [CI] = 1.19 to 1.49) and a 12% higher healing rate at 8 weeks (risk ratio = 1.12; 95% CI = 1.06 to 1.19) than were the H2RA agents. Similar results were obtained when the meta-analysis was performed on evaluable rather than all randomized patients and using the three different analytical techniques noted above. Slightly lower, though still highly significant, improvement in ulcer healing rates was obtained when the meta-analysis was performed using a subset of six studies that received high methodologic quality scores. These results support the conclusion that lansoprazole heals ulcers more quickly than do the H2RAs and also achieves higher overall rates of healing. The eradication of Helicobacter pylori associated with gastric ulcers was not assessed in individual studies.
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Affiliation(s)
- S R Tunis
- MetaWorks Inc., New England Medical Center, Boston, Massachusetts, USA
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Caubet JF, Stason WB, Bishop DJ, Ross SD. Sample sizes and withdrawals in clinical trials. Lancet 1996; 348:895. [PMID: 8826835 DOI: 10.1016/s0140-6736(05)64770-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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D'Anna G, Gammel PL, Ramirez AP, Yaron U, Oglesby CS, Bucher E, Bishop DJ. Evidence of surface superconductivity in 2H-NbSe2 single crystals. Phys Rev B Condens Matter 1996; 54:6583-6586. [PMID: 9986676 DOI: 10.1103/physrevb.54.6583] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Duarte A, Bolle CA, Gammel PL, Oglesby CS, Bucher E, Batlogg B, Bishop DJ. Dynamically induced disorder in the vortex lattice of 2H-NbSe2. Phys Rev B Condens Matter 1996; 53:11336-11339. [PMID: 9982746 DOI: 10.1103/physrevb.53.11336] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ramirez AP, Schiffer P, Cheong SW, Chen CH, Bao W, Palstra TT, Gammel PL, Bishop DJ, Zegarski B. Thermodynamic and electron diffraction signatures of charge and spin ordering in La1- xCaxMnO3. Phys Rev Lett 1996; 76:3188-3191. [PMID: 10060897 DOI: 10.1103/physrevlett.76.3188] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Ramirez AP, Gammel PL, Cheong SW, Bishop DJ, Chandra P. Charge modulation in La1.67Sr0.33NiO4: A bulk thermodynamic study. Phys Rev Lett 1996; 76:447-450. [PMID: 10061459 DOI: 10.1103/physrevlett.76.447] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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32
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D'Anna G, Gammel PL, Safar H, Alers GB, Bishop DJ, Giapintzakis J, Ginsberg DM. Vortex-motion-induced voltage noise in YBa2Cu3O7- delta single crystals. Phys Rev Lett 1995; 75:3521-3524. [PMID: 10059607 DOI: 10.1103/physrevlett.75.3521] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Yaron U, Gammel PL, Huse DA, Kleiman RN, Oglesby CS, Bucher E, Batlogg B, Bishop DJ, Mortensen K, Clausen KN, Bolle CA. Yaron et al. reply. Phys Rev Lett 1995; 75:3373. [PMID: 10059568 DOI: 10.1103/physrevlett.75.3373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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López D, Safar H, Gammel PL, Huse DA, Majumdar SN, Schneemeyer LF, Bishop DJ, Nieva G. López et al. reply. Phys Rev Lett 1995; 75:2447. [PMID: 10059308 DOI: 10.1103/physrevlett.75.2447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Safar H, Gammel PL, Huse DA, Alers GB, Bishop DJ, Lee WC, Giapintzakis J, Ginsberg DM. Vortex dynamics below the flux-lattice melting transition in YBa2Cu3O7- delta. Phys Rev B Condens Matter 1995; 52:6211-6214. [PMID: 9981846 DOI: 10.1103/physrevb.52.6211] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Yaron U, Gammel PL, Huse DA, Kleiman RN, Oglesby CS, Bucher E, Batlogg B, Bishop DJ, Mortensen K, Clausen KN. Structural evidence for a two-step process in the depinning of the superconducting flux-line lattice. Nature 1995. [DOI: 10.1038/376753a0] [Citation(s) in RCA: 163] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Durán CA, Gammel PL, Miller RE, Bishop DJ. Observation of magnetic-field penetration via dendritic growth in superconducting niobium films. Phys Rev B Condens Matter 1995; 52:75-78. [PMID: 9979573 DOI: 10.1103/physrevb.52.75] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Durán CA, Gammel PL, Bishop DJ, Rice JP, Ginsberg DM. Role of twin boundaries in the magnetic flux penetration in YBa2Cu3O7- delta. Phys Rev Lett 1995; 74:3712. [PMID: 10058277 DOI: 10.1103/physrevlett.74.3712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Schiffer P, Ramirez AP, Huse DA, Gammel PL, Yaron U, Bishop DJ, Valentino AJ. Frustration induced spin freezing in a site-ordered magnet: Gadolinium gallium garnet. Phys Rev Lett 1995; 74:2379-2382. [PMID: 10057913 DOI: 10.1103/physrevlett.74.2379] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Johnstone RE, Wax MK, Bishop DJ, Chafin JB. Large doses of topical lidocaine during microvascular surgery are not associated with toxic blood concentrations. Anesthesiology 1995; 82:593-6. [PMID: 7856922 DOI: 10.1097/00000542-199502000-00034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- R E Johnstone
- Department of Anesthesiology, West Virginia University, Morgantown 26506
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Yaron U, Gammel PL, Huse DA, Kleiman RN, Oglesby CS, Bucher E, Batlogg B, Bishop DJ, Mortensen K, Clausen K, Bolle CA. Neutron diffraction studies of flowing and pinned magnetic flux lattices in 2H-NbSe2. Phys Rev Lett 1994; 73:2748-2751. [PMID: 10057182 DOI: 10.1103/physrevlett.73.2748] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Safar H, Gammel PL, Huse DA, Majumdar SN, Schneemeyer LF, Bishop DJ, López D, Nieva G. Observation of a nonlocal conductivity in the mixed state of YBa2Cu3O7- delta : Experimental evidence for a vortex line liquid. Phys Rev Lett 1994; 72:1272-1275. [PMID: 10056666 DOI: 10.1103/physrevlett.72.1272] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Durán CA, Gammel PL, Wolfe R, Fratello VJ, Bishop DJ, Kimura T, Kitazawa K, Kishio K. Direct magneto-optical measurements of anisotropic critical currents in (La1-xSrx)2CuO4 single crystals. Phys Rev B Condens Matter 1994; 49:3608-3611. [PMID: 10011236 DOI: 10.1103/physrevb.49.3608] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Gammel PL, Huse DA, Kleiman RN, Batlogg B, Oglesby CS, Bucher E, Bishop DJ, Mason TE, Mortensen K. Small angle neutron scattering study of the magnetic flux-line lattice in single crystal 2H-NbSe2. Phys Rev Lett 1994; 72:278-281. [PMID: 10056104 DOI: 10.1103/physrevlett.72.278] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Bolle CA, Gammel PL, Waszczak JV, Bishop DJ. Observation of tilt induced orientational order in the magnetic flux lattice in 2H-NbSe2. Phys Rev Lett 1993; 71:4039-4042. [PMID: 10055138 DOI: 10.1103/physrevlett.71.4039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Safar H, Gammel PL, Huse DA, Bishop DJ, Lee WC, Giapintzakis J, Ginsberg DM. Experimental evidence for a multicritical point in the magnetic phase diagram for the mixed state of clean untwinned YBa2Cu3O7. Phys Rev Lett 1993; 70:3800-3803. [PMID: 10053965 DOI: 10.1103/physrevlett.70.3800] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Gammel PL, Durán CA, Bishop DJ, Kogan VG, Ledvij M, Simonov AY, Rice JP, Ginsberg DM. Observation of a novel vortex structure driven by magnetic interactions near a sawtooth twin boundary in YBa2Cu3O7- delta. Phys Rev Lett 1992; 69:3808-3811. [PMID: 10046919 DOI: 10.1103/physrevlett.69.3808] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Safar H, Rodriguez E, Gammel PL, Schneemeyer LF, Bishop DJ. Observation of two-dimensional vortices in Bi2Sr2CaCu2Ox. Phys Rev B Condens Matter 1992; 46:14238-14241. [PMID: 10003506 DOI: 10.1103/physrevb.46.14238] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kleiman RN, Broholm C, Aeppli G, Bucher E, Stücheli N, Bishop DJ, Clausen KN, Mortensen K, Pedersen JS, Howard B. Neutron diffraction from the vortex lattice in the heavy-fermion superconductor UPt3. Phys Rev Lett 1992; 69:3120-3123. [PMID: 10046730 DOI: 10.1103/physrevlett.69.3120] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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