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Safar K, Vandewouw MM, Sato J, Devasagayam J, Hill RM, Rea M, Brookes MJ, Taylor MJ. Using optically pumped magnetometers to replicate task-related responses in next generation magnetoencephalography. Sci Rep 2024; 14:6513. [PMID: 38499615 PMCID: PMC10948796 DOI: 10.1038/s41598-024-56878-6] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2023] [Accepted: 03/12/2024] [Indexed: 03/20/2024] Open
Abstract
Optically pumped magnetometers (OPMs) offer a new wearable means to measure magnetoencephalography (MEG) signals, with many advantages compared to conventional systems. However, OPMs are an emerging technology, thus characterizing and replicating MEG recordings is essential. Using OPM-MEG and SQUID-MEG, this study investigated evoked responses, oscillatory power, and functional connectivity during emotion processing in 20 adults, to establish replicability across the two technologies. Five participants with dental fixtures were included to assess the validity of OPM-MEG recordings in those with irremovable metal. Replicable task-related evoked responses were observed in both modalities. Similar patterns of oscillatory power to faces were observed in both systems. Increased connectivity was found in SQUID-versus OPM-MEG in an occipital and parietal anchored network. Notably, high quality OPM-MEG data were retained in participants with metallic fixtures, from whom no useable data were collected using conventional MEG.
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Affiliation(s)
- Kristina Safar
- Department of Diagnostic Imaging, Hospital for Sick Children, 555 University Avenue, Toronto, ON, M5G 1X8, Canada.
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada.
| | - Marlee M Vandewouw
- Department of Diagnostic Imaging, Hospital for Sick Children, 555 University Avenue, Toronto, ON, M5G 1X8, Canada
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada
- Autism Research Centre, Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, Canada
- Institute of Biomedical Engineering, University of Toronto, Toronto, Canada
| | - Julie Sato
- Department of Diagnostic Imaging, Hospital for Sick Children, 555 University Avenue, Toronto, ON, M5G 1X8, Canada
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada
| | - Jasen Devasagayam
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Castlebridge Office Village, Kirtley Drive, Nottingham, UK
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Castlebridge Office Village, Kirtley Drive, Nottingham, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Castlebridge Office Village, Kirtley Drive, Nottingham, UK
| | - Margot J Taylor
- Department of Diagnostic Imaging, Hospital for Sick Children, 555 University Avenue, Toronto, ON, M5G 1X8, Canada
- Program in Neurosciences and Mental Health, Hospital for Sick Children, Toronto, Canada
- Department of Medical Imaging, University of Toronto, Toronto, Canada
- Department of Psychology, University of Toronto, Toronto, Canada
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Schofield H, Hill RM, Feys O, Holmes N, Osborne J, Doyle C, Bobela D, Corvilian P, Wens V, Rier L, Bowtell R, Ferez M, Mullinger KJ, Coleman S, Rhodes N, Rea M, Tanner Z, Boto E, de Tiège X, Shah V, Brookes MJ. A Novel, Robust, and Portable Platform for Magnetoencephalography using Optically Pumped Magnetometers. bioRxiv 2024:2024.03.06.583313. [PMID: 38558964 PMCID: PMC10979878 DOI: 10.1101/2024.03.06.583313] [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] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
Magnetoencephalography (MEG) measures brain function via assessment of magnetic fields generated by neural currents. Conventional MEG uses superconducting sensors, which place significant limitations on performance, practicality, and deployment; however, the field has been revolutionised in recent years by the introduction of optically-pumped-magnetometers (OPMs). OPMs enable measurement of the MEG signal without cryogenics, and consequently the conception of 'OPM-MEG' systems which ostensibly allow increased sensitivity and resolution, lifespan compliance, free subject movement, and lower cost. However, OPM-MEG remains in its infancy with limitations on both sensor and system design. Here, we report a new OPM-MEG design with miniaturised and integrated electronic control, a high level of portability, and improved sensor dynamic range (arguably the biggest limitation of existing instrumentation). We show that this system produces equivalent measures when compared to an established instrument; specifically, when measuring task-induced beta-band, gamma-band and evoked neuro-electrical responses, source localisations from the two systems were highly comparable and temporal correlation was >0.7 at the individual level and >0.9 for groups. Using an electromagnetic phantom, we demonstrate improved dynamic range by running the system in background fields up to 8 nT. We show that the system is effective in gathering data during free movement (including a sitting-to-standing paradigm) and that it is compatible with simultaneous electroencephalography (EEG - the clinical standard). Finally, we demonstrate portability by moving the system between two laboratories. Overall, our new system is shown to be a significant step forward for OPM-MEG technology and offers an attractive platform for next generation functional medical imaging.
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Affiliation(s)
- Holly Schofield
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
| | - Ryan M. Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
| | - Odile Feys
- Université libre de Bruxelles, ULB Neuroscience Institute, Laboratoire de neuroanatomie et neuroimagerie translationelles, Brussels, Belgium
- Université libre de Bruxelles, Hôpital Universitaire de Bruxelles, Hôpital Erasme, Department of neurology, Brussels, Belgium
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
| | - James Osborne
- QuSpin Inc. 331 South 104 Street, Suite 130, Louisville, Colorado, 80027, USA
| | - Cody Doyle
- QuSpin Inc. 331 South 104 Street, Suite 130, Louisville, Colorado, 80027, USA
| | - David Bobela
- QuSpin Inc. 331 South 104 Street, Suite 130, Louisville, Colorado, 80027, USA
| | - Pierre Corvilian
- Université libre de Bruxelles, ULB Neuroscience Institute, Laboratoire de neuroanatomie et neuroimagerie translationelles, Brussels, Belgium
| | - Vincent Wens
- Université libre de Bruxelles, ULB Neuroscience Institute, Laboratoire de neuroanatomie et neuroimagerie translationelles, Brussels, Belgium
- Université libre de Bruxelles, Hôpital Universitaire de Bruxelles, Hôpital Erasme, Department of translational neuroimaging, Brussels, Belgium
| | - Lukas Rier
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Maxime Ferez
- Université libre de Bruxelles, ULB Neuroscience Institute, Laboratoire de neuroanatomie et neuroimagerie translationelles, Brussels, Belgium
| | - Karen J. Mullinger
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Centre for Human Brain Health, School of Psychology, University of Birmingham, UK
| | - Sebastian Coleman
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Natalie Rhodes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Molly Rea
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
| | - Zoe Tanner
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
| | - Xavier de Tiège
- Université libre de Bruxelles, ULB Neuroscience Institute, Laboratoire de neuroanatomie et neuroimagerie translationelles, Brussels, Belgium
- Université libre de Bruxelles, Hôpital Universitaire de Bruxelles, Hôpital Erasme, Department of translational neuroimaging, Brussels, Belgium
| | - Vishal Shah
- QuSpin Inc. 331 South 104 Street, Suite 130, Louisville, Colorado, 80027, USA
| | - Matthew J. Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Cerca Magnetics Limited, 2 Castlebridge Office Village, Kirtley Drive, Nottingham, NG7 1LD, Nottingham, UK
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Holmes N, Rea M, Hill RM, Leggett J, Edwards LJ, Hobson PJ, Boto E, Tierney TM, Rier L, Rivero GR, Shah V, Osborne J, Fromhold TM, Glover P, Brookes MJ, Bowtell R. Enabling ambulatory movement in wearable magnetoencephalography with matrix coil active magnetic shielding. Neuroimage 2023; 274:120157. [PMID: 37149237 PMCID: PMC10465235 DOI: 10.1016/j.neuroimage.2023.120157] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 04/13/2023] [Accepted: 05/03/2023] [Indexed: 05/08/2023] Open
Abstract
The ability to collect high-quality neuroimaging data during ambulatory participant movement would enable a wealth of neuroscientific paradigms. Wearable magnetoencephalography (MEG) based on optically pumped magnetometers (OPMs) has the potential to allow participant movement during a scan. However, the strict zero magnetic field requirement of OPMs means that systems must be operated inside a magnetically shielded room (MSR) and also require active shielding using electromagnetic coils to cancel residual fields and field changes (due to external sources and sensor movements) that would otherwise prevent accurate neuronal source reconstructions. Existing active shielding systems only compensate fields over small, fixed regions and do not allow ambulatory movement. Here we describe the matrix coil, a new type of active shielding system for OPM-MEG which is formed from 48 square unit coils arranged on two planes which can compensate magnetic fields in regions that can be flexibly placed between the planes. Through the integration of optical tracking with OPM data acquisition, field changes induced by participant movement are cancelled with low latency (25 ms). High-quality MEG source data were collected despite the presence of large (65 cm translations and 270° rotations) ambulatory participant movements.
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Affiliation(s)
- Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK; Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK.
| | - Molly Rea
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK; Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK; Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Lucy J Edwards
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Peter J Hobson
- School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Elena Boto
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK; Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Tim M Tierney
- Wellcome Centre for Human Neuroimaging, UCL Queen Square Institute of Neurology, University College London, London WC1N 3AR, UK
| | - Lukas Rier
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Gonzalo Reina Rivero
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK; Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
| | - Vishal Shah
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, CO 80027, USA
| | - James Osborne
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, CO 80027, USA
| | - T Mark Fromhold
- School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Paul Glover
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK; Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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4
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Holmes N, Rea M, Hill RM, Boto E, Leggett J, Edwards LJ, Rhodes N, Shah V, Osborne J, Fromhold TM, Glover P, Montague PR, Brookes MJ, Bowtell R. Naturalistic Hyperscanning with Wearable Magnetoencephalography. Sensors (Basel) 2023; 23:5454. [PMID: 37420622 DOI: 10.3390/s23125454] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 05/31/2023] [Accepted: 06/06/2023] [Indexed: 07/09/2023]
Abstract
The evolution of human cognitive function is reliant on complex social interactions which form the behavioural foundation of who we are. These social capacities are subject to dramatic change in disease and injury; yet their supporting neural substrates remain poorly understood. Hyperscanning employs functional neuroimaging to simultaneously assess brain activity in two individuals and offers the best means to understand the neural basis of social interaction. However, present technologies are limited, either by poor performance (low spatial/temporal precision) or an unnatural scanning environment (claustrophobic scanners, with interactions via video). Here, we describe hyperscanning using wearable magnetoencephalography (MEG) based on optically pumped magnetometers (OPMs). We demonstrate our approach by simultaneously measuring brain activity in two subjects undertaking two separate tasks-an interactive touching task and a ball game. Despite large and unpredictable subject motion, sensorimotor brain activity was delineated clearly, and the correlation of the envelope of neuronal oscillations between the two subjects was demonstrated. Our results show that unlike existing modalities, OPM-MEG combines high-fidelity data acquisition and a naturalistic setting and thus presents significant potential to investigate neural correlates of social interaction.
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Affiliation(s)
- Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
| | - Molly Rea
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
| | - Elena Boto
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Lucy J Edwards
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Natalie Rhodes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Vishal Shah
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, CO 80027, USA
| | - James Osborne
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, CO 80027, USA
| | - T Mark Fromhold
- School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - Paul Glover
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - P Read Montague
- Fralin Biomedical Research Institute, Department of Physics, Virginia Tech, Roanoke, VA 24016, USA
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
- Cerca Magnetics Limited, Unit 2 Castlebridge Office Village, Kirtley Drive, Nottingham NG7 1LD, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
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Rhodes N, Rea M, Boto E, Rier L, Shah V, Hill RM, Osborne J, Doyle C, Holmes N, Coleman SC, Mullinger K, Bowtell R, Brookes MJ. Measurement of Frontal Midline Theta Oscillations using OPM-MEG. Neuroimage 2023; 271:120024. [PMID: 36918138 PMCID: PMC10465234 DOI: 10.1016/j.neuroimage.2023.120024] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 02/10/2023] [Accepted: 03/11/2023] [Indexed: 03/14/2023] Open
Abstract
Optically pumped magnetometers (OPMs) are an emerging lightweight and compact sensor that can measure magnetic fields generated by the human brain. OPMs enable construction of wearable magnetoencephalography (MEG) systems, which offer advantages over conventional instrumentation. However, when trying to measure signals at low frequency, higher levels of inherent sensor noise, magnetic interference and movement artefact introduce a significant challenge. Accurate characterisation of low frequency brain signals is important for neuroscientific, clinical, and paediatric MEG applications and consequently, demonstrating the viability of OPMs in this area is critical. Here, we undertake measurement of theta band (4-8 Hz) neural oscillations and contrast a newly developed 174 channel triaxial wearable OPM-MEG system with conventional (cryogenic-MEG) instrumentation. Our results show that visual steady state responses at 4 Hz, 6 Hz and 8 Hz can be recorded using OPM-MEG with a signal-to-noise ratio (SNR) that is not significantly different to conventional MEG. Moreover, we measure frontal midline theta oscillations during a 2-back working memory task, again demonstrating comparable SNR for both systems. We show that individual differences in both the amplitude and spatial signature of induced frontal-midline theta responses are maintained across systems. Finally, we show that our OPM-MEG results could not have been achieved without a triaxial sensor array, or the use of postprocessing techniques. Our results demonstrate the viability of OPMs for characterising theta oscillations and add weight to the argument that OPMs can replace cryogenic sensors as the fundamental building block of MEG systems.
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Affiliation(s)
- Natalie Rhodes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Elena Boto
- Cerca Magnetics Ltd. 2, Castlebridge Office Village, Kirtley Dr, Nottingham NG7 1LD; Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Lukas Rier
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Vishal Shah
- QuSpin Inc. 331 South 104th Street, Suite 130, Louisville, Colorado, 80027, USA
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK; Cerca Magnetics Ltd. 2, Castlebridge Office Village, Kirtley Dr, Nottingham NG7 1LD
| | - James Osborne
- QuSpin Inc. 331 South 104th Street, Suite 130, Louisville, Colorado, 80027, USA
| | - Cody Doyle
- QuSpin Inc. 331 South 104th Street, Suite 130, Louisville, Colorado, 80027, USA
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK; Cerca Magnetics Ltd. 2, Castlebridge Office Village, Kirtley Dr, Nottingham NG7 1LD
| | - Sebastian C Coleman
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Karen Mullinger
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK; Centre for Human Brain Health, School of Psychology, University of Birmingham, Birmingham, B15 2TT, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK; Cerca Magnetics Ltd. 2, Castlebridge Office Village, Kirtley Dr, Nottingham NG7 1LD.
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6
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Schofield H, Boto E, Shah V, Hill RM, Osborne J, Rea M, Doyle C, Holmes N, Bowtell R, Woolger D, Brookes MJ. Quantum enabled functional neuroimaging: the why and how of magnetoencephalography using optically pumped magnetometers. Contemp Phys 2023; 63:161-179. [PMID: 38463461 PMCID: PMC10923587 DOI: 10.1080/00107514.2023.2182950] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 02/06/2023] [Indexed: 03/12/2024]
Abstract
Non-invasive imaging has transformed neuroscientific discovery and clinical practice, providing a non-invasive window into the human brain. However, whilst techniques like MRI generate ever more precise images of brain structure, in many cases, it's the function within neural networks that underlies disease. Here, we review the potential for quantum-enabled magnetic field sensors to shed light on such activity. Specifically, we describe how optically pumped magnetometers (OPMs) enable magnetoencephalographic (MEG) recordings with higher accuracy and improved practicality compared to the current state-of-the-art. The paper is split into two parts: first, we describe the work to date on OPM-MEG, detailing why this novel biomagnetic imaging technique is proving disruptive. Second, we explain how fundamental physics, including quantum mechanics and electromagnetism, underpins this developing technology. We conclude with a look to the future, outlining the potential for OPM-MEG to initiate a step change in the understanding and management of brain health.
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Affiliation(s)
- Holly Schofield
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Nottingham, UK
| | - Elena Boto
- Cerca Magnetics Limited, Nottingham, UK
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | | | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Nottingham, UK
| | | | - Molly Rea
- Cerca Magnetics Limited, Nottingham, UK
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | | | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Nottingham, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | | | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
- Cerca Magnetics Limited, Nottingham, UK
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7
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Rea M, Boto E, Holmes N, Hill R, Osborne J, Rhodes N, Leggett J, Rier L, Bowtell R, Shah V, Brookes MJ. A 90-channel triaxial magnetoencephalography system using optically pumped magnetometers. Ann N Y Acad Sci 2022; 1517:107-124. [PMID: 36065147 PMCID: PMC9826099 DOI: 10.1111/nyas.14890] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [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] [Indexed: 01/11/2023]
Abstract
Magnetoencephalography (MEG) measures the small magnetic fields generated by current flow in neural networks, providing a noninvasive metric of brain function. MEG is well established as a powerful neuroscientific and clinical tool. However, current instrumentation is hampered by cumbersome cryogenic field-sensing technologies. In contrast, MEG using optically pumped magnetometers (OPM-MEG) employs small, lightweight, noncryogenic sensors that provide data with higher sensitivity and spatial resolution, a natural scanning environment (including participant movement), and adaptability to any age. However, OPM-MEG is new and the optimum way to design a system is unknown. Here, we construct a novel, 90-channel triaxial OPM-MEG system and use it to map motor function during a naturalistic handwriting task. Results show that high-precision magnetic field control reduced background fields to ∼200 pT, enabling free participant movement. Our triaxial array offered twice the total measured signal and better interference rejection compared to a conventional (single-axis) design. We mapped neural oscillatory activity to the sensorimotor network, demonstrating significant differences in motor network activity and connectivity for left-handed versus right-handed handwriting. Repeatability across scans showed that we can map electrophysiological activity with an accuracy ∼4 mm. Overall, our study introduces a novel triaxial OPM-MEG design and confirms its potential for high-performance functional neuroimaging.
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Affiliation(s)
- Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | - Ryan Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | | | - Natalie Rhodes
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | - Lukas Rier
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
| | | | - Matthew J. Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and AstronomyUniversity of NottinghamNottinghamUK
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8
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Holmes N, Rea M, Chalmers J, Leggett J, Edwards LJ, Nell P, Pink S, Patel P, Wood J, Murby N, Woolger D, Dawson E, Mariani C, Tierney TM, Mellor S, O'Neill GC, Boto E, Hill RM, Shah V, Osborne J, Pardington R, Fierlinger P, Barnes GR, Glover P, Brookes MJ, Bowtell R. A lightweight magnetically shielded room with active shielding. Sci Rep 2022; 12:13561. [PMID: 35945239 PMCID: PMC9363499 DOI: 10.1038/s41598-022-17346-1] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Accepted: 07/25/2022] [Indexed: 11/09/2022] Open
Abstract
Magnetically shielded rooms (MSRs) use multiple layers of materials such as MuMetal to screen external magnetic fields that would otherwise interfere with high precision magnetic field measurements such as magnetoencephalography (MEG). Optically pumped magnetometers (OPMs) have enabled the development of wearable MEG systems which have the potential to provide a motion tolerant functional brain imaging system with high spatiotemporal resolution. Despite significant promise, OPMs impose stringent magnetic shielding requirements, operating around a zero magnetic field resonance within a dynamic range of ± 5 nT. MSRs developed for OPM-MEG must therefore effectively shield external sources and provide a low remnant magnetic field inside the enclosure. Existing MSRs optimised for OPM-MEG are expensive, heavy, and difficult to site. Electromagnetic coils are used to further cancel the remnant field inside the MSR enabling participant movements during OPM-MEG, but present coil systems are challenging to engineer and occupy space in the MSR limiting participant movements and negatively impacting patient experience. Here we present a lightweight MSR design (30% reduction in weight and 40-60% reduction in external dimensions compared to a standard OPM-optimised MSR) which takes significant steps towards addressing these barriers. We also designed a 'window coil' active shielding system, featuring a series of simple rectangular coils placed directly onto the walls of the MSR. By mapping the remnant magnetic field inside the MSR, and the magnetic field produced by the coils, we can identify optimal coil currents and cancel the remnant magnetic field over the central cubic metre to just |B|= 670 ± 160 pT. These advances reduce the cost, installation time and siting restrictions of MSRs which will be essential for the widespread deployment of OPM-MEG.
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Affiliation(s)
- Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - James Chalmers
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Lucy J Edwards
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Paul Nell
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Stephen Pink
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Prashant Patel
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Jack Wood
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Nick Murby
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - David Woolger
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Eliot Dawson
- Cerca Magnetics Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Christopher Mariani
- Cerca Magnetics Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Tim M Tierney
- Wellcome Centre for Human Neuroimaging, UCL Institute of Neurology, London, WC1N 3AR, UK
| | - Stephanie Mellor
- Wellcome Centre for Human Neuroimaging, UCL Institute of Neurology, London, WC1N 3AR, UK
| | - George C O'Neill
- Wellcome Centre for Human Neuroimaging, UCL Institute of Neurology, London, WC1N 3AR, UK
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Vishal Shah
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, CO, 80027, USA
| | - James Osborne
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, CO, 80027, USA
| | | | - Peter Fierlinger
- Department of Physics, Technical University Munich, 85748, Garching, Germany
| | - Gareth R Barnes
- Wellcome Centre for Human Neuroimaging, UCL Institute of Neurology, London, WC1N 3AR, UK
| | - Paul Glover
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Brookes MJ, Leggett J, Rea M, Hill RM, Holmes N, Boto E, Bowtell R. Magnetoencephalography with optically pumped magnetometers (OPM-MEG): the next generation of functional neuroimaging. Trends Neurosci 2022; 45:621-634. [PMID: 35779970 PMCID: PMC10465236 DOI: 10.1016/j.tins.2022.05.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 05/06/2022] [Accepted: 05/24/2022] [Indexed: 10/17/2022]
Abstract
Magnetoencephalography (MEG) measures human brain function via assessment of the magnetic fields generated by electrical activity in neurons. Despite providing high-quality spatiotemporal maps of electrophysiological activity, current MEG instrumentation is limited by cumbersome field sensing technologies, resulting in major barriers to utility. Here, we review a new generation of MEG technology that is beginning to lift many of these barriers. By exploiting quantum sensors, known as optically pumped magnetometers (OPMs), 'OPM-MEG' has the potential to dramatically outperform the current state of the art, promising enhanced data quality (better sensitivity and spatial resolution), adaptability to any head size/shape (from babies to adults), motion robustness (participants can move freely during scanning), and a less complex imaging platform (without reliance on cryogenics). We discuss the current state of this emerging technique and describe its far-reaching implications for neuroscience.
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Affiliation(s)
- Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Ronan NJ, Einarsson GG, Deane J, Fouhy F, Rea M, Hill C, Shanahan F, Elborn JS, Ross RP, McCarthy M, Murphy DM, Eustace JA, Mm T, Stanton C, Plant BJ. Modulation, microbiota and inflammation in the adult CF gut: A prospective study. J Cyst Fibros 2022; 21:837-843. [PMID: 35764510 DOI: 10.1016/j.jcf.2022.06.002] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 06/03/2022] [Accepted: 06/04/2022] [Indexed: 02/05/2023]
Abstract
BACKGROUND Cystic Fibrosis (CF) has prominent gastrointestinal and pancreatic manifestations. The aim of this study was to determine the effect of Cystic fibrosis transmembrane conductance regulator (CFTR) modulation on, gastrointestinal inflammation, pancreatic function and gut microbiota composition in people with cystic fibrosis (CF) and the G551D-CFTR mutation. METHODS Fourteen adult patients with the G551D-CFTR mutation were assessed clinically at baseline and for up to 1 year after treatment with ivacaftor. The change in gut inflammatory markers (calprotectin and lactoferrin), exocrine pancreatic status and gut microbiota composition and structure were assessed in stool samples. RESULTS There was no significant change in faecal calprotectin nor lactoferrin in patients with treatment while all patients remained severely pancreatic insufficient. There was no significant change in gut microbiota diversity and richness following treatment. CONCLUSION There was no significant change in gut inflammation after partial restoration of CFTR function with ivacaftor, suggesting that excess gut inflammation in CF is multi-factorial in aetiology. In this adult cohort, exocrine pancreatic function was irreversibly lost. Longer term follow-up may reveal more dynamic changes in the gut microbiota and possible restoration of CFTR function.
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Affiliation(s)
- N J Ronan
- Cork Adult CF Centre, Cork University Hospital, Wilton, Cork; HRB Clinical research facility, University College Cork
| | - G G Einarsson
- Halo Research Group, Queen's University Belfast, Belfast, UK; Wellcome-Wolfson Institute for Experimental Medicine. School of Medicine, Dentistry and Biomedical Sciences Queen's University Belfast, Belfast, UK
| | - J Deane
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland; APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland
| | - F Fouhy
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland; APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland
| | - M Rea
- Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland; APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland
| | - C Hill
- APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland
| | - F Shanahan
- APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland
| | - J S Elborn
- Halo Research Group, Queen's University Belfast, Belfast, UK; Wellcome-Wolfson Institute for Experimental Medicine. School of Medicine, Dentistry and Biomedical Sciences Queen's University Belfast, Belfast, UK
| | - R P Ross
- APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland
| | - M McCarthy
- Cork Adult CF Centre, Cork University Hospital, Wilton, Cork
| | - D M Murphy
- Cork Adult CF Centre, Cork University Hospital, Wilton, Cork
| | - J A Eustace
- HRB Clinical research facility, University College Cork
| | - Tunney Mm
- Halo Research Group, Queen's University Belfast, Belfast, UK; School of Pharmacy, Queen's University Belfast, Belfast, UK; HRB Clinical research facility, University College Cork
| | - C Stanton
- Wellcome-Wolfson Institute for Experimental Medicine. School of Medicine, Dentistry and Biomedical Sciences Queen's University Belfast, Belfast, UK; Teagasc Food Research Centre, Moorepark, Fermoy, Cork, Ireland
| | - B J Plant
- Cork Adult CF Centre, Cork University Hospital, Wilton, Cork; HRB Clinical research facility, University College Cork; APC Microbiome Ireland, University College Cork, NUI, Cork, Ireland.
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11
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Wittevrongel B, Holmes N, Boto E, Hill R, Rea M, Libert A, Khachatryan E, Van Hulle MM, Bowtell R, Brookes MJ. Practical real-time MEG-based neural interfacing with optically pumped magnetometers. BMC Biol 2021; 19:158. [PMID: 34376215 PMCID: PMC8356471 DOI: 10.1186/s12915-021-01073-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [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: 10/29/2020] [Accepted: 04/25/2021] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Brain-computer interfaces decode intentions directly from the human brain with the aim to restore lost functionality, control external devices or augment daily experiences. To combine optimal performance with wide applicability, high-quality brain signals should be captured non-invasively. Magnetoencephalography (MEG) is a potent candidate but currently requires costly and confining recording hardware. The recently developed optically pumped magnetometers (OPMs) promise to overcome this limitation, but are currently untested in the context of neural interfacing. RESULTS In this work, we show that OPM-MEG allows robust single-trial analysis which we exploited in a real-time 'mind-spelling' application yielding an average accuracy of 97.7%. CONCLUSIONS This shows that OPM-MEG can be used to exploit neuro-magnetic brain responses in a practical and flexible manner, and opens up new avenues for a wide range of new neural interface applications in the future.
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Affiliation(s)
- Benjamin Wittevrongel
- Laboratory for Neuro- and Psychophysiology, Department of Neurosciences, KU Leuven, Leuven, Belgium. .,Leuven Institute for Artificial Intelligence (Leuven.AI), Leuven, Belgium. .,Leuven Brain Institute (LBI), Leuven, Belgium.
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | - Ryan Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | - Arno Libert
- Laboratory for Neuro- and Psychophysiology, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Leuven Brain Institute (LBI), Leuven, Belgium
| | - Elvira Khachatryan
- Laboratory for Neuro- and Psychophysiology, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Leuven Brain Institute (LBI), Leuven, Belgium
| | - Marc M Van Hulle
- Laboratory for Neuro- and Psychophysiology, Department of Neurosciences, KU Leuven, Leuven, Belgium.,Leuven Institute for Artificial Intelligence (Leuven.AI), Leuven, Belgium.,Leuven Brain Institute (LBI), Leuven, Belgium
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, UK
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12
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Rea M, Holmes N, Hill RM, Boto E, Leggett J, Edwards LJ, Woolger D, Dawson E, Shah V, Osborne J, Bowtell R, Brookes MJ. Precision magnetic field modelling and control for wearable magnetoencephalography. Neuroimage 2021; 241:118401. [PMID: 34273527 PMCID: PMC9248349 DOI: 10.1016/j.neuroimage.2021.118401] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [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: 12/04/2020] [Revised: 06/30/2021] [Accepted: 07/13/2021] [Indexed: 11/27/2022] Open
Abstract
Optically-pumped magnetometers (OPMs) are highly sensitive, compact magnetic field sensors, which offer a viable alternative to cryogenic sensors (superconducting quantum interference devices – SQUIDs) for magnetoencephalography (MEG). With the promise of a wearable system that offers lifespan compliance, enables movement during scanning, and provides higher quality data, OPMs could drive a step change in MEG instrumentation. However, this potential can only be realised if background magnetic fields are appropriately controlled, via a combination of optimised passive magnetic screening (i.e. enclosing the system in layers of high-permeability materials), and electromagnetic coils to further null the remnant magnetic field. In this work, we show that even in an OPM-optimised passive shield with extremely low (<2 nT) remnant magnetic field, head movement generates significant artefacts in MEG data that manifest as low-frequency interference. To counter this effect we introduce a magnetic field mapping technique, in which the participant moves their head to sample the background magnetic field using a wearable sensor array; resulting data are compared to a model to derive coefficients representing three uniform magnetic field components and five magnetic field gradient components inside the passive shield. We show that this technique accurately reconstructs the magnitude of known magnetic fields. Moreover, by feeding the obtained coefficients into a bi-planar electromagnetic coil system, we were able to reduce the uniform magnetic field experienced by the array from a magnitude of 1.3 ± 0.3 nT to 0.29 ± 0.07 nT. Most importantly, we show that this field compensation generates a five-fold reduction in motion artefact at 0–2 Hz, in a visual steady-state evoked response experiment using 6 Hz stimulation. We suggest that this technique could be used in future OPM-MEG experiments to improve the quality of data, especially in paradigms seeking to measure low-frequency oscillations, or in experiments where head movement is encouraged.
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Affiliation(s)
- Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Lucy J Edwards
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - David Woolger
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Eliot Dawson
- Magnetic Shields Limited, Headcorn Road, Staplehurst, Tonbridge, Kent, TN12 0DS, UK
| | - Vishal Shah
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, 80027, Colorado, USA
| | - James Osborne
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, 80027, Colorado, USA
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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13
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Boto E, Hill RM, Rea M, Holmes N, Seedat ZA, Leggett J, Shah V, Osborne J, Bowtell R, Brookes MJ. Measuring functional connectivity with wearable MEG. Neuroimage 2021; 230:117815. [PMID: 33524584 PMCID: PMC8216250 DOI: 10.1016/j.neuroimage.2021.117815] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [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: 09/23/2020] [Revised: 12/11/2020] [Accepted: 01/24/2021] [Indexed: 12/26/2022] Open
Abstract
Optically-pumped magnetometers (OPMs) offer the potential for a step change in magnetoencephalography (MEG) enabling wearable systems that provide improved data quality, accommodate any subject group, allow data capture during movement and potentially reduce cost. However, OPM-MEG is a nascent technology and, to realise its potential, it must be shown to facilitate key neuroscientific measurements, such as the characterisation of brain networks. Networks, and the connectivities that underlie them, have become a core area of neuroscientific investigation, and their importance is underscored by many demonstrations of their disruption in brain disorders. Consequently, a demonstration of network measurements using OPM-MEG would be a significant step forward. Here, we aimed to show that a wearable 50-channel OPM-MEG system enables characterisation of the electrophysiological connectome. To this end, we measured connectivity in the resting state and during a visuo-motor task, using both OPM-MEG and a state-of-the-art 275-channel cryogenic MEG device. Our results show that resting-state connectome matrices from OPM and cryogenic systems exhibit a high degree of similarity, with correlation values >70%. In addition, in task data, similar differences in connectivity between individuals (scanned multiple times) were observed in cryogenic and OPM-MEG data, again demonstrating the fidelity of the OPM-MEG device. This is the first demonstration of network connectivity measured using OPM-MEG, and results add weight to the argument that OPMs will ultimately supersede cryogenic sensors for MEG measurement.
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Affiliation(s)
- Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Zelekha A Seedat
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Vishal Shah
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, 80027, CO, USA
| | - James Osborne
- QuSpin Inc., 331 South 104th Street, Suite 130, Louisville, 80027, CO, USA
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
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14
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Hill RM, Boto E, Rea M, Holmes N, Leggett J, Coles LA, Papastavrou M, Everton SK, Hunt BAE, Sims D, Osborne J, Shah V, Bowtell R, Brookes MJ. Multi-channel whole-head OPM-MEG: Helmet design and a comparison with a conventional system. Neuroimage 2020; 219:116995. [PMID: 32480036 PMCID: PMC8274815 DOI: 10.1016/j.neuroimage.2020.116995] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 05/20/2020] [Accepted: 05/23/2020] [Indexed: 12/18/2022] Open
Abstract
Magnetoencephalography (MEG) is a powerful technique for functional
neuroimaging, offering a non-invasive window on brain electrophysiology. MEG
systems have traditionally been based on cryogenic sensors which detect the
small extracranial magnetic fields generated by synchronised current in neuronal
assemblies, however, such systems have fundamental limitations. In recent years,
non-cryogenic quantum-enabled sensors, called optically-pumped magnetometers
(OPMs), in combination with novel techniques for accurate background magnetic
field control, have promised to lift those restrictions offering an adaptable,
motion-robust MEG system, with improved data quality, at reduced cost. However,
OPM-MEG remains a nascent technology, and whilst viable systems exist, most
employ small numbers of sensors sited above targeted brain regions. Here,
building on previous work, we construct a wearable OPM-MEG system with
‘whole-head’ coverage based upon commercially available OPMs, and
test its capabilities to measure alpha, beta and gamma oscillations. We design
two methods for OPM mounting; a flexible (EEG-like) cap and rigid
(additively-manufactured) helmet. Whilst both designs allow for high quality
data to be collected, we argue that the rigid helmet offers a more robust option
with significant advantages for reconstruction of field data into 3D images of
changes in neuronal current. Using repeat measurements in two participants, we
show signal detection for our device to be highly robust. Moreover, via
application of source-space modelling, we show that, despite having 5 times
fewer sensors, our system exhibits comparable performance to an established
cryogenic MEG device. While significant challenges still remain, these
developments provide further evidence that OPM-MEG is likely to facilitate a
step change for functional neuroimaging.
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Affiliation(s)
- Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK.
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Laurence A Coles
- Added Scientific Limited, No 4, The Isaac Newton Centre, Nottingham Science Park, Nottingham, NG72RH, UK
| | - Manolis Papastavrou
- Added Scientific Limited, No 4, The Isaac Newton Centre, Nottingham Science Park, Nottingham, NG72RH, UK
| | - Sarah K Everton
- Added Scientific Limited, No 4, The Isaac Newton Centre, Nottingham Science Park, Nottingham, NG72RH, UK
| | - Benjamin A E Hunt
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Dominic Sims
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - James Osborne
- QuSpin Inc. 331 South 104th Street, Suite 130, Louisville, CO, 80027, USA
| | - Vishal Shah
- QuSpin Inc. 331 South 104th Street, Suite 130, Louisville, CO, 80027, USA
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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16
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Roberts G, Holmes N, Alexander N, Boto E, Leggett J, Hill RM, Shah V, Rea M, Vaughan R, Maguire EA, Kessler K, Beebe S, Fromhold M, Barnes GR, Bowtell R, Brookes MJ. Towards OPM-MEG in a virtual reality environment. Neuroimage 2019; 199:408-417. [PMID: 31173906 PMCID: PMC8276767 DOI: 10.1016/j.neuroimage.2019.06.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [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: 02/19/2019] [Revised: 04/12/2019] [Accepted: 06/03/2019] [Indexed: 01/08/2023] Open
Abstract
Virtual reality (VR) provides an immersive environment in which a participant can experience a feeling of presence in a virtual world. Such environments generate strong emotional and physical responses and have been used for wide-ranging applications. The ability to collect functional neuroimaging data whilst a participant is immersed in VR would represent a step change for experimental paradigms; unfortunately, traditional brain imaging requires participants to remain still, limiting the scope of naturalistic interaction within VR. Recently however, a new type of magnetoencephalography (MEG) device has been developed, that employs scalp-mounted optically-pumped magnetometers (OPMs) to measure brain electrophysiology. Lightweight OPMs, coupled with precise control of the background magnetic field, enables participant movement during data acquisition. Here, we exploit this technology to acquire MEG data whilst a participant uses a virtual reality head-mounted display (VRHMD). We show that, despite increased magnetic interference from the VRHMD, we were able to measure modulation of alpha-band oscillations, and the visual evoked field. Moreover, in a VR experiment in which a participant had to move their head to look around a virtual wall and view a visual stimulus, we showed that the measured MEG signals map spatially in accordance with the known organisation of primary visual cortex. This technique could transform the type of neuroscientific experiment that can be undertaken using functional neuroimaging.
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Affiliation(s)
- Gillian Roberts
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Niall Holmes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Nicholas Alexander
- Aston Laboratory for Immersive Virtual Environments, School of Life and Health Sciences, Aston University, Birmingham, BE4 7ET, United Kingdom
| | - Elena Boto
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - James Leggett
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Ryan M Hill
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Vishal Shah
- QuSpin Inc. 331 S 104th St, Louisville, CO, 80027, USA
| | - Molly Rea
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Richard Vaughan
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Eleanor A Maguire
- Wellcome Centre for Human Neuroimaging, UCL Queen Square Institute of Neurology, University College London, 12 Queen Square, London, WC1N 3AR, United Kingdom
| | - Klaus Kessler
- Aston Laboratory for Immersive Virtual Environments, School of Life and Health Sciences, Aston University, Birmingham, BE4 7ET, United Kingdom; Aston Brain Centre, School of Life and Health Sciences, Aston University, Birmingham, BE4 7ET, United Kingdom
| | - Shaun Beebe
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Mark Fromhold
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Gareth R Barnes
- Wellcome Centre for Human Neuroimaging, UCL Queen Square Institute of Neurology, University College London, 12 Queen Square, London, WC1N 3AR, United Kingdom
| | - Richard Bowtell
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Matthew J Brookes
- Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
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Broadbent HJ, Osborne T, Rea M, Peng A, Mareschal D, Kirkham NZ. Incidental category learning and cognitive load in a multisensory environment across childhood. Dev Psychol 2018; 54:1020-1028. [PMID: 29309181 PMCID: PMC5961402 DOI: 10.1037/dev0000472] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Multisensory information has been shown to facilitate learning (Bahrick & Lickliter, 2000; Broadbent, White, Mareschal, & Kirkham, 2017; Jordan & Baker, 2011; Shams & Seitz, 2008). However, although research has examined the modulating effect of unisensory and multisensory distractors on multisensory processing, the extent to which a concurrent unisensory or multisensory cognitive load task would interfere with or support multisensory learning remains unclear. This study examined the role of concurrent task modality on incidental category learning in 6- to 10-year-olds. Participants were engaged in a multisensory learning task while also performing either a unisensory (visual or auditory only) or multisensory (audiovisual) concurrent task (CT). We found that engaging in an auditory CT led to poorer performance on incidental category learning compared with an audiovisual or visual CT, across groups. In 6-year-olds, category test performance was at chance in the auditory-only CT condition, suggesting auditory concurrent tasks may interfere with learning in younger children, but the addition of visual information may serve to focus attention. These findings provide novel insight into the use of multisensory concurrent information on incidental learning. Implications for the deployment of multisensory learning tasks within education across development and developmental changes in modality dominance and ability to switch flexibly across modalities are discussed.
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Affiliation(s)
- H J Broadbent
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - T Osborne
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - M Rea
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - A Peng
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - D Mareschal
- Centre for Brain and Cognitive Development, Birkbeck, University of London
| | - N Z Kirkham
- Centre for Brain and Cognitive Development, Birkbeck, University of London
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18
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Baron C, Charreaux F, Rea M, Morel A, Quinton H. 131 RETROSPECTIVE DATA ANALYSIS OF HOLSTEIN HEIFER GROWTH IN EMBRYO PRODUCTION CENTERS. Reprod Fertil Dev 2016. [DOI: 10.1071/rdv28n2ab131] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The reduction of the generation gap has become of main interest in the race for the genetic improvement of cattle and in reducing the environmental impact of dairy farms. Sexual precocity of high genetic merit heifers is therefore essential, as it allows the development of their potential as soon as possible thanks to embryo collection. Many factors influence the sexual precocity and embryos production of bovine females. A major effect of the calves’ growth rate has often been observed on puberty precocity in experimental trials. This study was carried out on data recorded from January 2010 to May 2015 on 617 Holstein heifers housed in 2 centers of embryos production with similar breeding conditions in France. The purpose was to find optimal breeding values of Holstein heifers for embryo production in these centers. The heifers entered at the centers between 4 to 15 months old (after a quarantine of 30 days) to produce in vivo embryos during 2 to 4 collections before to come back pregnant to their breeder owner. The first treatment of superovulation was programmed when a first heat was observed visually or via an activity sensor (Heatime R) or when a corpus luteum had been detected (ultrasound scans). The studied variables were the date of the first flushing as a precocity indicator and the collection results for the production of embryos (numbers of total and viable embryos). In this population, the average age at entry was 8.5 ± 2.3 months old (minimum = 3.4; maximum = 15.0), the average age at the first collection 14.3 ± 1.2 months (minimum = 11.0; maximum = 19.0), the average daily gain (ADG) between 0 and 12 months was 792 ± 86 g day–1 (minimum = 492; maximum = 1027), the average number of total structures by collection 9.3 ± 6.1, the mean number of viable embryos 5.5 ± 3.8. Data analysis by multivariate ANOVA test showed an effect on age at first collection for the center (P = 0.009), age at entry (P < 0.001), and ADG between 0 and 12 months (P < 0.001). Heifers with ADG between 0 and 12 months of <650 g day–1 had a delay of 70 days for the first collection compared to those with an ADG of >900 g day–1. The ADG between 0 and 12 months had also the strongest negative correlation found with the age at first collection (r = 0.52). Similarly, ADG between 0 and 6 months of the 40 heifers entered in the centers before the age of 6 months was significant for age at the first collection (P = 0.0001), whereas ADG between 6 and 12 months was not. Regarding the production of embryos, only the weight at the first collection tended (P = 0.07) to have an effect on the total number of collected structures: 10.1 ± 6.5 for heifers that weighted more than 420 kg v. 7.3 ± 4.0 for those that weighted less than 340 kg. No effect on the percentage of grade 1 or 2 embryos could be observed. In conclusion, this study conducted in production conditions confirmed the observations made in experimental trials and refined the recommendations and practices of the two centers to reduce the age at first embryo flushing.
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Sherring C, Bushell T, Rea M, Beca J, Hogan C, Tai J, Moore M. Paediatric nasal high flow therapy—Just a lot of hot air? Aust Crit Care 2013. [DOI: 10.1016/j.aucc.2013.02.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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20
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Cevenni E, Celani L, Rea J, Numminen A, Virras O, Broczek K, Sikora E, Franceschi C, Rea M. Do nonagenarian siblings provide mutual support? Insights from the EU GeHA project. Eur Geriatr Med 2012. [DOI: 10.1016/j.eurger.2012.07.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Coluzzi S, Giona F, De Nicolò MC, Amendola A, Arista MC, Neri A, Rea M, Chirletti P, Foà R, Girelli G. Response of AIHA to high dose intravenous immunoglobulins in a patient with ovarian teratoma. Eur J Clin Invest 2009; 39:531-2. [PMID: 19490062 DOI: 10.1111/j.1365-2362.2009.02134.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 11/28/2022]
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22
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Sanges M, Valente G, Rea M, Della Gatta R, De Franchis G, Sollazzo R, D'Arienzo A. Probiotics in spondyloarthropathy associated with ulcerative colitis: a pilot study. Eur Rev Med Pharmacol Sci 2009; 13:233-234. [PMID: 19673175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
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23
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Abstract
The magnetic fields present in the magnetic resonance (MR) environment impose severe constraints on any mechatronic device present in its midst, requiring alternative actuators, sensors, and materials to those conventionally used in traditional system engineering. In addition the spatial constraints of closed-bore scanners require a physical separation between the radiologist and the imaged region of the patient. This configuration produces a loss of the sense of touch from the target anatomy for the clinician, which often provides useful information. To recover the force feedback from the tissue, an MR-compatible haptic unit, designed to be integrated with a five-degrees-of-freedom mechatronic system for MR-guided prostate biopsy, has been developed which incorporates position control and force feedback to the operator. The haptic unit is designed to be located inside the scanner isocentre with the master console in the control room. MR compatibility of the device has been demonstrated, showing a negligible degradation of the signal-to-noise ratio and virtually no geometric distortion. By combining information from the position encoder and force sensor, tissue stiffness measurement along the needle trajectory is demonstrated in a lamb liver to aid diagnosis of suspected cancerous tissue.
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Affiliation(s)
- Z T H Tse
- Mechatronics in Medicine Laboratory, Department of Mechanical Engineering, Imperial College London, London, UK
| | - H Elhawary
- Mechatronics in Medicine Laboratory, Department of Mechanical Engineering, Imperial College London, London, UK
| | - M Rea
- Mechatronics in Medicine Laboratory, Department of Mechanical Engineering, Imperial College London, London, UK
| | - I Young
- Mechatronics in Medicine Laboratory, Department of Mechanical Engineering, Imperial College London, London, UK
| | - B L Davis
- Mechatronics in Medicine Laboratory, Department of Mechanical Engineering, Imperial College London, London, UK
| | - M Lamperth
- Mechatronics in Medicine Laboratory, Department of Mechanical Engineering, Imperial College London, London, UK
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Elhawary H, Zivanovic A, Tse ZTH, Rea M, Davies BL, Young I, Bydder G, Payley M, Lamperth MU. A magnetic-resonance-compatible limb-positioning device to facilitate magic angle experiments in vivo. Proc Inst Mech Eng H 2008; 222:751-60. [PMID: 18756692 DOI: 10.1243/09544119jeim361] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Owing to their highly ordered structure, tendons and cartilage appear with low signal intensity when imaged using magnetic resonance imaging (MRI) scanners. A significant increase in signal can be observed when these structures are oriented at 55 degrees (termed the magic angle) with respect to the static field B0. There is a clear clinical importance in exploiting this effect as part of the diagnosis of injury. Experimental studies of this phenomenon have been made harder by the practical difficulties associated with tissue positioning and orientation in the confined environment of closed-bore scanners. An MRI-compatible mechatronic system has been developed, which is capable of positioning a number of limbs to a desired orientation inside the scanner, to be used as a diagnostic and research tool. It is actuated with a novel pneumatic motor consisting of a heavily geared-down air turbine, presenting high torques and good accuracy. The system is shown to be magnetic resonance compatible and the results of preliminary trials using the device to image the Achilles tendon of human volunteers at different orientations are presented. An increase of four fold to thirteen fold in signal intensity can be observed at the magic angle.
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Affiliation(s)
- H Elhawary
- Department of Mechanical Engineering, Imperial College London, London, UK
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Nocera E, Bozzelli L, Rea M, Cuniato V, Di Martino M, Natale R. EPIDEMIOLOGIA DELLE PARASSITOSI INTESTINALI IN UNA POPOLAZIONE DI IMMIGRATI EXTRA COMUNITARI. Microbiol Med 2005. [DOI: 10.4081/mm.2005.3562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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26
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Laviola G, Adriani W, Rea M, Aloe L, Alleva E. Social withdrawal, neophobia, and stereotyped behavior in developing rats exposed to neonatal asphyxia. Psychopharmacology (Berl) 2004; 175:196-205. [PMID: 14985924 DOI: 10.1007/s00213-004-1800-3] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2003] [Accepted: 01/01/2004] [Indexed: 11/28/2022]
Abstract
Perinatal asphyxia is a concern for public health and may promote subtle neuropsychiatric disorders. Anoxic insults to neonatal rats cause long-lasting neurobehavioral deficits. In the present study, we focussed on changes in emotional behaviors as a consequence of neonatal asphyxia in Wistar rats. Newborn pups (24 h after birth) underwent a single 30-min exposure to a 100% N2 atmosphere (or air). The offspring was tested for a) locomotor and exploratory activity with or without a d-amphetamine challenge (0, 1, or 2 mg/kg) on postnatal day (pnd) 15; b) social interactions and novelty seeking during adolescence; c) levels of the brain-derived neurotrophic factor (BDNF). In the open-field test (pnd 15), N2-exposed pups injected with the high (2 mg/kg) amphetamine dose exhibited reduced levels of locomotor hyperactivity, and a more marked involvement in stereotyped behaviors. Individual differences emerged in the locomotor response to the novelty-seeking test: two subgroups of rats (separated on the basis of the median value) showed either arousal/attraction or avoidance/inhibition in response to free-choice novelty. The N2-exposed group showed a more marked novelty-induced avoidance and inhibition. Time devoted to allogrooming and play-soliciting behaviors was reduced, whereas object exploration was increased. Levels of BDNF were reduced in the striatum of N2-exposed rats, suggesting poorer synaptic performance of dopamine pathways. In conclusion, these findings suggest an increased risk of developing social withdrawal, neophobia and behavioral stereotypies (common symptoms found in schizophrenia and autism) as a consequence of neonatal asphyxia in preterm humans.
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Affiliation(s)
- G Laviola
- Section of Behavioral Pathophysiology, Lab Fisiopatologia OS, Dipartimento Biologia Cellulare e Neuroscienze, Istituto Superiore di Sanita', viale Regina Elena 299, 00161 Roma, Italy.
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27
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Enjolras N, Plantier JL, Rodriguez MH, Rea M, Attali O, Vinciguerra C, Negrier C. Two novel mutations in EGF-like domains of human factor IX dramatically impair intracellular processing and secretion. J Thromb Haemost 2004; 2:1143-54. [PMID: 15219198 DOI: 10.1111/j.1538-7836.2004.00756.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We investigated the mechanisms responsible for severe factor IX (FIX) deficiency in two cross-reacting material (CRM)-negative hemophilia B patients with a mutation in the first and second epidermal growth factor (EGF) domains of FIX (C71Y and C109Y, respectively). We have determined the kinetics of mutant FIX biosynthesis and secretion in comparison with wild-type FIX (FIXwt). In transfected cells, FIXwt was retrieved as two intracellular molecular forms, rapidly secreted into the culture medium. One appeared to be correctly N-glycosylated, and corresponded to a form trafficking between the endoplasmic reticulum (ER) and Golgi apparatus. The other corresponded to the mature form, ready to be secreted, exhibiting correct N-glycosylation and sialylation. In contrast, the two mutants, FIXC71Y and FIXC109Y, were not secreted from the cells and did not accumulate intracellularly. Relative to FIXwt, they were retained longer in the ER and were only N-glycosylated. In addition, the intracellular concentration of the FIX mutants increased when ALLN, an inhibitor of cysteine proteases and of the proteasome degradation pathway, was added to the culture medium. Both the FIX mutants and FIXwt were associated in the ER with the 78-kDa glucose-regulated protein (GRP78/BiP) and calreticulin (CRT), though the amount of CRT associated with the two mutants was twice as strong as with FIXwt. These results strongly suggest that chaperone and lectin molecules act in concert to ensure both proper folding of FIXwt and the retention of mutant molecules.
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Affiliation(s)
- N Enjolras
- Laboratoire d'Hémobiologie EA 1508, Faculté de Médecine RTH Laennec, Lyon, France.
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28
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Cuniato V, Bellitti F, D’Isanto R, Di Martino M, Nocera E, Bozzelli L, Rea M, Stornaiuolo G, Precone D, Gaeta G. INFEZIONE CRONICA DA VIRUS EPATITICI E DA HIV IN UNA POPOLAZIONE DI IMMIGRATI IN CAMPANIA. Microbiol Med 2003. [DOI: 10.4081/mm.2003.4360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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29
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Morley-Fletcher S, Rea M, Adriani W, Laviola G. [Impact of socio-environmental factors on physiological processes of brain damage recovery: contribution of animal models]. Ann Ist Super Sanita 2002; 37:567-72. [PMID: 12046227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
This review presents the experimental approaches more widely used in animal models to investigate possible strategies aimed to stimulate plasticity in the nervous system and possibly to increase spontaneous recovery from functional/neurological diseases such as neonatal anoxia. Methods used in laboratory rodents are briefly described. Attention is focused on possible enrichments of the social and physical environment during the development.
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Affiliation(s)
- S Morley-Fletcher
- Laboratorio di Fisiopatologia di Organo e di Sistema, Istituto Superiore di Sanità, Roma
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30
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Pagliarini A, Rubini R, Rea M, Campese M. Crown fractures: effectiveness of current enamel-dentin adhesives in reattachment of fractured fragments. Quintessence Int 2000; 31:133-6. [PMID: 11203915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
OBJECTIVE The introduction of the current enamel-dentin adhesives has simplified the reattachment of fractured dentinal fragments. The objective of this study was to determine the strength needed to detach coronal fragments reattached with the most recent adhesives. METHOD AND MATERIALS A complete coronal fracture was caused on the incisal one third of 40 noncarious maxillary and mandibular lateral and central incisors. Each fractured coronal fragment was reattached to its tooth with the enamel-dentin adhesive Scotchbond MP, All-Bond 2, Dentastic, or One-Step (10 specimens each). RESULTS There was no statistically significant difference between 2 similar fourth-generation adhesives that use orthophosphoric acid as etchant (Dentastic and All-Bond 2) and a fourth-generation adhesive that uses maleic acid as etchant (Scotchbond MP). The values obtained with the fifth-generation adhesive (One-Step) were significantly inferior to those obtained with the other 3 enamel-dentin adhesives. CONCLUSION In the reattachment of fractured tooth fragments, fourth-generation adhesives can guarantee a bonding force stronger than fifth-generation adhesives.
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Affiliation(s)
- A Pagliarini
- Odontological Clinic, University of Ferrara, corso Giovecca, 203, 44100, Ferrara, Italy.
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31
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Lubin B, Van Whitlock R, Rea M, Petren S. Response manipulation on the Multiple Affect Adjective Check List-Revised. Assessment 1998; 5:101-13. [PMID: 9626386 DOI: 10.1177/107319119800500201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The scoring pattern of the Multiple Affect Adjective Check List-Revised (MAACL-R) under both "simulate good" and "simulate bad" conditions and under two instructional sets, either "simulate" (Sample 1) or "simulate with caution" (Sample 2), was studied in an experiment in which the MAACL-R state form was administered to two groups of college students, each consisting of 160 participants. Each participant was tested twice with both a baseline "actual" trial and either a "simulate bad" or "simulate good" trial with the "actual" and experimental "simulate" trials counterbalanced. Participants in Sample 2, but not Sample 1, received instructions to be "cautious so as not to be detected." As expected, the scoring pattern of the MAACL-R was susceptible to response manipulation in the predicted directions. However, instructions to "simulate with caution" did not produce significantly different scores than did instructions to "simulate" alone. In the second study, Receiver Operating Characteristics (ROC) was used to determine the utility of each MAACL-R scale to detect response simulation. For both "simulate bad" and "simulate good," the PA and PASS scales showed the highest correct classification rates. However, detection of simulating bad was more accurate than determination of simulating good.
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Affiliation(s)
- B Lubin
- University of Missouri-Kansas City, USA
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32
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Weisman AG, Okazaki S, Gregory J, Goldstien MJ, Tompson MC, Rea M, Miklowitz DJ. Evaluating therapist competency and adherence to behavioral family management with bipolar patients. Fam Process 1998; 37:107-121. [PMID: 9589285 DOI: 10.1111/j.1545-5300.1998.00107.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The present study assessed fidelity to the behavioral family management (BFM) model for treating bipolar disorder patients and their families. The BFM Therapist Competency/Adherence Scale (BFM-TCAS) was developed to evaluate clinicians' competency and adherence to BFM, as outlined by Miklowitz' (1989) BFM Manual for use with bipolar patients. Therapist competency and treatment adherence was also evaluated with regard to two family characteristics: overall level of family difficulty and family expressed emotion (EE) status. The BFM-TCAS was used to code 78 videotaped sessions of 26 families with a bipolar member, selected from a larger treatment study of bipolar disorder patients. The findings suggest that, overall, clinicians adhered closely to the BFM manual. Specific areas in which there was high competency and treatment adherence were (a) skill in conveying factual information about bipolar illness, (b) establishment of a therapeutic environment, and (c) ability to take command of therapy sessions. The one area in which there was less competency and relatively weak adherence to the manual was the use of between-session homework assignments to assist families in mastering the BFM exercises. Results of this study also suggest that, for the most part, therapist competency and adherence ratings were not related to overall level of difficulty or to family EE status.
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Affiliation(s)
- A G Weisman
- Department of Psychology, University of Massachusetts-Boston 02125-3393, USA.
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Schlundt DG, Rea M, Hodge M, Flannery ME, Kline S, Meek J, Kinzer C, Pichert JW. Assessing and overcoming situational obstacles to dietary adherence in adolescents with IDDM. J Adolesc Health 1996; 19:282-8. [PMID: 8897106 DOI: 10.1016/1054-139x(95)00197-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
PURPOSE To develop and evaluate a tool for assessing selected aspects of dietary adherence in adolescents with diabetes mellitus (IDDM). METHODS The Situational Obstacles to Dietary Adherence Questionnaire (SODA) is a 30-item inventory that yields a total self-efficacy score and scales that measure cognitive and behavioral coping strategies. Alternative forms of the SODA were administered at the beginning and end of a summer camp for youngsters with IDDM in order to obtain evidence for its reliability and validity, and to evaluate the impact of an educational intervention. The program consisted of two 50-minute small group sessions intended to help adolescents with IDDM improve their ability to cope with challenging dietary situations. Using the method of anchored instruction, the campers first viewed a video about a teenager with diabetes who faces common situations that make diabetes self-management difficult. Group problem-solving sessions led by a registered dietitian were used to help campers learn more effective ways to solve dietary problems. RESULTS AND CONCLUSIONS Results suggested that the SODA has reasonable reliability and validity. In addition, anchored instruction improved dietary self-efficacy and changed young adolescents' estimates of how often they would use selected cognitive and behavioral strategies to solve dietary problems.
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Affiliation(s)
- D G Schlundt
- Vanderbilt University, School of Medicine, Diabetes Research and Training Center, Nashville, Tennessee 37212, USA
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35
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Pagliarini A, Rubini R, Rea M, Campese C, Grandini R. Effectiveness of the current enamel-dentinal adhesives: a new methodology for its evaluation. Quintessence Int 1996; 27:265-70. [PMID: 8941845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Two Class II boxes of standardized dimensions were prepared in each of 10 extracted third molar teeth. The dentinal adhesives Syntac, Gluma 2000, Scotchbond MP, and All-bond 2 were applied to five boxes each. All the boxes were restored with the same photopolymerizing resin composite. The microleakage of each restoration was measured in the permeability cell. The physiologic solution able to seep between the walls of the cavity and resin composite was measured and the flux of the liquid over time was calculated. All-Bond 2 was the only adhesive found, in some specimens, to make the dentin completely impermeable and to form an extremely precise seal between the resin complete material and the underlying dentinal surface. The flux values for all four adhesives were significantly different; Syntac allowed the greatest amount of microleakage. However, these in vitro results should not be considered absolute values.
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Affiliation(s)
- A Pagliarini
- Department of Conservative Dentistry, University of Ferrara, School of Dentistry, Italy
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36
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Rea M, Arca R, Baccaro A, Carlini E, D'Emilia N, Bosco R, Venturi N, Sansoni B. [Gallstone ileus]. MINERVA CHIR 1993; 48:841-6. [PMID: 8247296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Gallstone ileus is a rare condition whose diagnosis may be difficult. From January 1976 to December 1991 4 cases of gallstone ileus were treated in our hospital, representing 1% of all patients admitted with mechanical bowel obstruction during that period. Three patients were treated by enterolithotomy alone to remove the impacted stone. In one patient intestinal resection of the bowel tract was associated followed by end to end anastomosis. One patient died (33%) seven days after surgery for cardiopulmonary failure. In one patient the obstruction resolved with the passage of a stone per rectum. The Authors conclude that enterolithotomy alone should be the standard procedure for gallstone ileus. The repair of cholecyst-enteric fistula should be done later only if there are continuing or recurrent symptoms.
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Affiliation(s)
- M Rea
- Ospedale Umberto I di Frosinone, Reparto di Chirurgia Generale
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Chopin A, Malcolm S, Jarvis G, Asperger H, Beckers HJ, Bertona AM, Cominazzini C, Carini S, Lodi R, Hahn G, Heeschen W, Jans JA, Jervis DI, Lanier JM, O'Connor F, Rea M, Rossi J, Seligmann R, Tesone S, Waes G, Mocquot G, Pivnick H. ICMSF Methods Studies. XV. Comparison of Four Media and Methods for Enumerating Staphylococcus aureus in Powdered Milk. J Food Prot 1985; 48:21-27. [PMID: 30934501 DOI: 10.4315/0362-028x-48.1.21] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Four media were examined for their usefulness in enumerating Staphylococcus aureus inoculated (a) into milk that was then dried or (b) directly into dried milk powder. In all, seven strains of S. aureus were inoculated individually into each preparation and were enumerated after two periods of storage (18 to 19 d and 60 to 61 d). Fourteen laboratories from twelve countries participated in the comparison which found that direct plating on agar medium in 14-cm petri dishes may be as useful as enrichment followed by streaking. Plating on Baird-Parker medium or on Hauschild pork plasma fibrinogen medium and a MPN method using Giolitti and Cantoni's broth with Tween 80 were equally sensitive for enumerating S. aureus in dried milk powder. The use of Hauschild medium may eliminate the need for supplementary tests to confirm colonies as S. aureus , but in some cases was found to fail in some laboratories. Giolitti and Cantoni's broth without Tween 80 generally was less useful than the three other media for enumerating S. aureus . S. aureus inoculated into milk that was then dried survived longer than when inoculated into dried milk.
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Affiliation(s)
- A Chopin
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - S Malcolm
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - G Jarvis
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - H Asperger
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - H J Beckers
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - A M Bertona
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - C Cominazzini
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - S Carini
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - R Lodi
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - G Hahn
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - W Heeschen
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - J A Jans
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - D I Jervis
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - J M Lanier
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - F O'Connor
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - M Rea
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - J Rossi
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - R Seligmann
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - S Tesone
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - G Waes
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - G Mocquot
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
| | - H Pivnick
- Institut National de la Recherche Agronomique, 35042 Rennes, France; Health Protection Branch, Ottawa, Canada; Veterinärmedizinische Universität, Wien, Austria; Rijks Instituut voor de Volksgezondheid, Bilthoven, The Netherlands; Laboratorio Provinciale d'Igiene e Profilassi, Novara, Italy; Università degli Studi di Milano, Milano, Italy; Institut für Milchforschung, Kiel, Germany; Stichting Centraal Orgaan, Zuivelcontrole, Leusden, The Netherlands; St. Ivel Technical Centre, Bradford-on-Avon, Wilts, United Kingdon; Food and Drug Administration, Minneapolis, Minnesota; Moorepark Research Centre, Fermoy, County Cork, Ireland; Istituto di Microbiologia, Lattiero-casearia, Università di Perugia, Italy; Ministry of Health, Haifa, Israel; CITIL-INTI, Buenos Aires, Argentina; and Rijkszuivelstation, Melle, Belgium
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Balcavage WX, Baxter-Gabbard KL, Ko M, Rea M, Padgett F, Levine AS. Mitochondrial alterations associated with avian reticuloendotheliosis virus (strain T) pathogenicity. Biochem Biophys Res Commun 1972; 48:605-11. [PMID: 5047690 DOI: 10.1016/0006-291x(72)90391-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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