The Experts below are selected from a list of 10962 Experts worldwide ranked by ideXlab platform
Timothy J Doherty - One of the best experts on this subject based on the ideXlab platform.
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influence of Needle Electrode depth on de sta motor unit number estimation
Muscle & Nerve, 2014Co-Authors: Colleen T Ives, Timothy J DohertyAbstract:Introduction: To assess a potential source of technique-associated error, we evaluated the influence of Needle Electrode depth on decomposition-enhanced spike-triggered averaging (DE-STA) motor unit number estimation (MUNE) and quantitative motor unit analysis in the upper trapezius (UT). Methods: The DE-STA MUNE protocol was performed at superficial, intermediate, and deep Needle Electrode depths in 18 control subjects. Results: Mean surface-detected motor unit potential amplitudes were significantly smaller for intermediate versus superficial (P < 0.05), deep versus superficial (P < 0.001), and deep versus intermediate (P < 0.05). MUNE was significantly larger for deep versus superficial (P < 0.001), with statistical trends toward larger MUNE values at greater depths for the remaining comparisons. No significant differences were found among Needle Electrode depths for quantitative motor unit potential parameters. Conclusions: These results demonstrate the important influence of Needle Electrode depth on DE-STA MUNE in the UT. Suggestions are made for improved standardization of the protocol. Muscle Nerve 50: 587–592, 2014
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Influence of Needle Electrode depth on DE-STA motor unit number estimation.
Muscle & Nerve, 2014Co-Authors: Colleen T Ives, Timothy J DohertyAbstract:Introduction: To assess a potential source of technique-associated error, we evaluated the influence of Needle Electrode depth on decomposition-enhanced spike-triggered averaging (DE-STA) motor unit number estimation (MUNE) and quantitative motor unit analysis in the upper trapezius (UT). Methods: The DE-STA MUNE protocol was performed at superficial, intermediate, and deep Needle Electrode depths in 18 control subjects. Results: Mean surface-detected motor unit potential amplitudes were significantly smaller for intermediate versus superficial (P
Colleen T Ives - One of the best experts on this subject based on the ideXlab platform.
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influence of Needle Electrode depth on de sta motor unit number estimation
Muscle & Nerve, 2014Co-Authors: Colleen T Ives, Timothy J DohertyAbstract:Introduction: To assess a potential source of technique-associated error, we evaluated the influence of Needle Electrode depth on decomposition-enhanced spike-triggered averaging (DE-STA) motor unit number estimation (MUNE) and quantitative motor unit analysis in the upper trapezius (UT). Methods: The DE-STA MUNE protocol was performed at superficial, intermediate, and deep Needle Electrode depths in 18 control subjects. Results: Mean surface-detected motor unit potential amplitudes were significantly smaller for intermediate versus superficial (P < 0.05), deep versus superficial (P < 0.001), and deep versus intermediate (P < 0.05). MUNE was significantly larger for deep versus superficial (P < 0.001), with statistical trends toward larger MUNE values at greater depths for the remaining comparisons. No significant differences were found among Needle Electrode depths for quantitative motor unit potential parameters. Conclusions: These results demonstrate the important influence of Needle Electrode depth on DE-STA MUNE in the UT. Suggestions are made for improved standardization of the protocol. Muscle Nerve 50: 587–592, 2014
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Influence of Needle Electrode depth on DE-STA motor unit number estimation.
Muscle & Nerve, 2014Co-Authors: Colleen T Ives, Timothy J DohertyAbstract:Introduction: To assess a potential source of technique-associated error, we evaluated the influence of Needle Electrode depth on decomposition-enhanced spike-triggered averaging (DE-STA) motor unit number estimation (MUNE) and quantitative motor unit analysis in the upper trapezius (UT). Methods: The DE-STA MUNE protocol was performed at superficial, intermediate, and deep Needle Electrode depths in 18 control subjects. Results: Mean surface-detected motor unit potential amplitudes were significantly smaller for intermediate versus superficial (P
Michio Matsumura - One of the best experts on this subject based on the ideXlab platform.
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fabrication of pores in a silicon carbide wafer by electrochemical etching with a glassy carbon Needle Electrode
ACS Applied Materials & Interfaces, 2013Co-Authors: Tomohiko Sugita, Kazuki Hiramatsu, Shigeru Ikeda, Michio MatsumuraAbstract:An electrochemical method for making pores in a silicon carbide (SiC) wafer, in which a glassy-carbon (GC) Needle Electrode was used for processing, is described. By bringing the GC Electrode into contact with SiC at its tip end in 20 mol dm–3 HF solution and applying an anodic potential of or higher than 4 V vs Ag/AgCl to it, SiC was etched at the SiC/GC contact area, leading to pore formation in SiC. The diameter of the pore was almost the same as the diameter of the tip of the GC Electrode (about 130 μm). By addition of sulfuric acid to the HF solution, the rate of pore formation was increased. As a result, the depth of pores formed after processing for 5 h at 10 V vs Ag/AgCl was increased from 15.3 μm to about 33 μm by addition of sulfuric acid at a concentration of 3.0 mol dm–3.
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pore formation in a p type silicon wafer using a platinum Needle Electrode with application of square wave potential pulses in hf solution
ACS Applied Materials & Interfaces, 2013Co-Authors: Tomohiko Sugita, Kazuki Hiramatsu, Shigeru Ikeda, Michio MatsumuraAbstract:By bringing an anodically biased Needle Electrode into contact with n-type Si at its tip in a solution containing hydrofluoric acid, Si is etched at the interface with the Needle Electrode and a pore is formed. However, in the case of p-type Si, although pores can be formed, Si is likely to be corroded and covered with a microporous Si layer. This is due to injection of holes from the Needle Electrode into the bulk of p-type Si, which shifts its potential to a level more positive than the potential needed for corrosion and formation of a microporous Si layer. However, by applying square-wave potential pulses to a Pt Needle Electrode, these undesirable changes are prevented because holes injected into the bulk of Si during the period of anodic potential are annihilated with electrons injected into Si during the period of cathodic potential. Even under such conditions, holes supplied to the place near the Si/metal interface are used for etching p-type Si, leading to formation of a pore at the place where the Pt Needle Electrode was in contact.
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Pore formation in a p-type silicon wafer using a platinum Needle Electrode with application of square-wave potential pulses in HF solution.
ACS Applied Materials & Interfaces, 2013Co-Authors: Tomohiko Sugita, Kazuki Hiramatsu, Shigeru Ikeda, Michio MatsumuraAbstract:By bringing an anodically biased Needle Electrode into contact with n-type Si at its tip in a solution containing hydrofluoric acid, Si is etched at the interface with the Needle Electrode and a pore is formed. However, in the case of p-type Si, although pores can be formed, Si is likely to be corroded and covered with a microporous Si layer. This is due to injection of holes from the Needle Electrode into the bulk of p-type Si, which shifts its potential to a level more positive than the potential needed for corrosion and formation of a microporous Si layer. However, by applying square-wave potential pulses to a Pt Needle Electrode, these undesirable changes are prevented because holes injected into the bulk of Si during the period of anodic potential are annihilated with electrons injected into Si during the period of cathodic potential. Even under such conditions, holes supplied to the place near the Si/metal interface are used for etching p-type Si, leading to formation of a pore at the place where th...
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Formation of through-holes in Si wafers by using anodically polarized Needle Electrodes in HF solution.
ACS Applied Materials & Interfaces, 2011Co-Authors: Tomohiko Sugita, Shigeru Ikeda, Chia-lung Lee, Michio MatsumuraAbstract:Electrochemical pore formation in Si using an anodized Needle Electrode was studied. In the electrochemical process, a Pt, Ir or Pd Needle with a diameter of 50–200 μm was brought into contact at its tip with a Si wafer, which was not connected to an external circuit, in HF solution. By applying an anodic potential to the Needle Electrode against a Pt counter Electrode, a pore with a diameter slightly larger than the diameter of the Needle Electrode was formed in both p-type and n-type Si, of which current efficiency was higher for n-type Si. Through-holes were electrochemically formed in p-type and n-type Si wafers at speeds higher than 30 μm min–1 using a sharpened Ir Needle Electrode. A model was proposed to explain the results, in which the pore formation was attributed to successive dissolution of Si atoms near the 3-phase (Si/metal/HF solution) boundary by positive holes injected from the Needle Electrode to the surface of Si.
Takeshi Kawano - One of the best experts on this subject based on the ideXlab platform.
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single 5 μm diameter Needle Electrode block modules for unit recordings in vivo
Scientific Reports, 2016Co-Authors: Hiroto Sawahata, Makoto Ishida, Shota Yamagiwa, A Moriya, T Dong, Yoriko Ando, Rika Numano, Kowa Koida, Takeshi KawanoAbstract:Investigations into mechanisms in various cortical areas can be greatly improved and supported by stable recording of single neuronal activity. In this study, fine silicon wire Electrodes (diameter 3 μm, length 160 μm) are fabricated by vapor–liquid–solid (VLS) growth with the aim of stabilizing recording and reducing the invasiveness on the measurement procedure. The Electrode is fabricated on a modular 1 × 1 mm2 conductive silicon block that can be assembled into a number of different device packages, for example on rigid or flexible printed circuit boards (PCB). After plating with a 5 μm diameter platinum black, the Needle exhibits an electrical impedance of ~100 kΩ at 1 kHz in saline. The in vivo recording capability of the device is demonstrated using mice, and spike signals with peak-to-peak amplitudes of 200−300 μV in the range 0.5−3 kHz are stably detected, including single-unit activities in cortical layer 2/3. In addition, the device packaged with a flexible PCB shows stable unit recordings for 98.5 min (n = 4). Consequently, our modular, low-invasive Needle Electrode block devices present an effective route for single-unit recordings in vivo, as well as demonstrating adaptability in device design for a diverse range of experiments.
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in vivo neuronal action potential recordings via three dimensional microscale Needle Electrode arrays
Scientific Reports, 2015Co-Authors: Akifumi Fujishiro, Hidekazu Kaneko, Takahiro Kawashima, Makoto Ishida, Takeshi KawanoAbstract:In vivo neuronal action potential recordings via three-dimensional microscale Needle-Electrode arrays
Zhiqiang Yang - One of the best experts on this subject based on the ideXlab platform.
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Electrodeposition of chitosan glucose oxidase biocomposite onto pt pb nanoparticles modified stainless steel Needle Electrode for amperometric glucose biosensor
Journal of Materials Science: Materials in Medicine, 2011Co-Authors: Meiqing Guo, Haidong Fang, Rui Wang, Zhiqiang YangAbstract:A glucose biosensor was fabricated by Electrodepositing chitosan (CS)-glucose oxidase(GOD) biocomposite onto the stainless steel Needle Electrode (SSN Electrode) modified by Pt–Pb nanoparticles (Pt–Pb/SSN Electrode). Firstly, Pt–Pb nanoparticles were deposited onto the SSN Electrode and then CS-GOD biocomposite was co-Electrodeposited onto the Pt–Pb/SSN Electrode in a mixed solution containing p-benzoquinone (p-BQ), CS and GOD. The electrochemical results showed that the Pt–Pb nanoparticles can accelerate the electron transfer and improve the effective surface area of the SSN Electrode. As a result, the detection range of the proposed biosensor was from 0.03 to 9 mM with a current sensitivity of 0.4485 μA/mM and a response time of 15 s. The Michaelis constant value was calculated to be 4.9837 mM. The cell test results indicated that the Electrodes have a low cytotoxicity. This work provided a suitable technology for the fabrication of the Needle-type glucose biosensor.
