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Depth electrode

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https://www.readbyqxmd.com/read/29034573/memory-encoding-related-anterior-hippocampal-potentials-are-modulated-by-deep-brain-stimulation-of-the-entorhinal-area
#1
Niels Hansen, Leila Chaieb, Marlene Derner, Kevin G Hampel, Christian E Elger, Rainer Surges, Bernhard Staresina, Nikolai Axmacher, Juergen Fell
BACKGROUND: Deep brain stimulation (DBS) of the human entorhinal area using 50 Hz pulses has revealed conflicting results regarding memory performance. Moreover, its impact on memory-related hippocampal potentials has not yet been investigated. METHODS: We recorded data from seven epilepsy patients implanted with depth electrodes in the entorhinal cortex, hippocampus, amygdala and parahippocampal cortex. Entorhinal DBS (bipolar, biphasic 50 Hz pulses, on- and off-cycles of 15 s) was applied with low amplitude (0...
October 16, 2017: Hippocampus
https://www.readbyqxmd.com/read/29028955/gamma-band-oscillations-preferential-for-nociception-can-be-recorded-in-the-human-insula
#2
Giulia Liberati, Anne Klöcker, Maxime Algoet, Dounia Mulders, Marta Maia Safronova, Susana Ferrao Santos, José-Géraldo Ribeiro Vaz, Christian Raftopoulos, André Mouraux
Transient nociceptive stimuli elicit robust phase-locked local field potentials (LFPs) in the human insula. However, these responses are not preferential for nociception, as they are also elicited by transient non-nociceptive vibrotactile, auditory, and visual stimuli. Here, we investigated whether another feature of insular activity, namely gamma-band oscillations (GBOs), is preferentially observed in response to nociceptive stimuli. Although nociception-evoked GBOs have never been explored in the insula, previous scalp electroencephalography and magnetoencephalography studies suggest that nociceptive stimuli elicit GBOs in other areas such as the primary somatosensory and prefrontal cortices, and that this activity could be closely related to pain perception...
September 25, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29026979/hpaec-pad-for-oligosaccharide-analysis-novel-insights-into-analyte-sensitivity-and-response-stability
#3
Matthias Mechelke, Jonathan Herlet, J Philipp Benz, Wolfgang H Schwarz, Vladimir V Zverlov, Wolfgang Liebl, Petra Kornberger
The rising importance of accurately detecting oligosaccharides in biomass hydrolyzates or as ingredients in food, such as in beverages and infant milk products, demands for the availability of tools to sensitively analyze the broad range of available oligosaccharides. Over the last decades, HPAEC-PAD has been developed into one of the major technologies for this task and represents a popular alternative to state-of-the-art LC-MS oligosaccharide analysis. This work presents the first comprehensive study which gives an overview of the separation of 38 analytes as well as enzymatic hydrolyzates of six different polysaccharides focusing on oligosaccharides...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28992760/-cochlear-view-plain-radiograph-a-simple-reliable-positioning-method
#4
Stephanie Elyse Ambrose, Norman Wendell Todd
INTRODUCTION: The plain 'cochlear view' radiograph for checking cochlear implant electrode coiling and depth of insertion is strongly influenced by positioning. The best accuracy and inter-observer agreement are achieved with the X-ray beam passing through the axis of the modiolus, which is perpendicular to the plane of the basal turn of the cochlea. The basal turn of the cochlea generally is 45 from the head's sagittal plane. OBJECTIVE: To describe a simple reliable technique of patient positioning to maximize the accuracy of postoperative radiographs in the evaluation of cochlear electrode insertion...
October 10, 2017: Cochlear Implants International
https://www.readbyqxmd.com/read/28989738/pragmatic-analysis-of-the-electric-submerged-arc-furnace-continuum
#5
K Karalis, N Karkalos, G S E Antipas, A Xenidis
A transient mathematical model was developed for the description of fluid flow, heat transfer and electromagnetic phenomena involved in the production of ferronickel in electric arc furnaces. The key operating variables considered were the thermal and electrical conductivity of the slag and the shape, immersion depth and applied electric potential of the electrodes. It was established that the principal stimuli of the velocities in the slag bath were the electric potential and immersion depth of the electrodes and the thermal and electrical conductivities of the slag...
September 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28982098/the-relationship-of-electrophysiologic-subthalamic-nucleus-length-as-a-predictor-of-outcomes-in-deep-brain-stimulation-for-parkinson-disease
#6
Mahesh B Shenai, Daxa M Patel, Andrew Romeo, J Dylan Whisenhunt, Harrison C Walker, Stephanie Guthrie, Barton L Guthrie
BACKGROUND: Intraoperative measurement of subthalamic nucleus (STN) width through microelectrode recording (MER) is a common proxy for optimal electrode location during deep brain stimulation (DBS) surgery for Parkinson disease. We assessed whether the MER-determined STN width is a predictor of postoperative Unified Parkinson Disease Rating Scale (UPDRS) improvement. METHODS: Records were reviewed for patients who underwent single-sided STN DBS placement for Parkinson disease between 2005 and 2010 at the UAB Medical Center...
October 6, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28972731/enhancing-the-ion-transport-in-limn1-5ni0-5o4-by-altering-the-particle-wulff-shape-via-anisotropic-surface-segregation
#7
Jiajia Huang, Haodong Liu, Naixie Zhou, Ke An, Ying Shirley Meng, Jian Luo
Spontaneous and anisotropic surface segregation of W cations in LiMn1.5Ni0.5O4 particles can alter the Wulff shape and improve surface stability, thereby significantly improving the electrochemical performance. An Auger electron nanoprobe was employed to identify the anisotropic surface segregation, whereby W cations prefer to segregate to {110} surface facets to decrease its relative surface energy according to Gibbs adsorption theory and subsequently increase its surface area according to Wulff theory. Consequently, the rate performance is improved (e...
October 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28961938/implantation-of-depth-electrodes-in-children-using-varioguide%C3%A2-frameless-navigation-system-technical-note
#8
Marcelo Budke, Josue M Avecillas-Chasin, Francisco Villarejo
BACKGROUND: Electrode placement in epilepsy surgery seeks to locate the sites of ictal onset and early propagation. An invasive diagnostic procedure, stereoelectroencephalography (SEEG) is usually implemented with frame-based methods that can be especially problematic in young children. OBJECTIVE: To evaluate the feasibility and accuracy of a new technique for frameless SEEG in children using the VarioGuide® system (Brainlab AG, München, Germany). METHODS: A frameless stereotactic navigation system was used to implant depth electrodes with percutaneous drilling and bolt insertion in pediatric patients with medically refractory epilepsy...
September 9, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28960962/synchrotron-x-ray-analytical-techniques-for-studying-materials-electrochemistry-in-rechargeable-batteries
#9
Feng Lin, Yijin Liu, Xiqian Yu, Lei Cheng, Andrej Singer, Oleg G Shpyrko, Huolin L Xin, Nobumichi Tamura, Chixia Tian, Tsu-Chien Weng, Xiao-Qing Yang, Ying Shirley Meng, Dennis Nordlund, Wanli Yang, Marca M Doeff
Rechargeable battery technologies have ignited major breakthroughs in contemporary society, including but not limited to revolutions in transportation, electronics, and grid energy storage. The remarkable development of rechargeable batteries is largely attributed to in-depth efforts to improve battery electrode and electrolyte materials. There are, however, still intimidating challenges of lower cost, longer cycle and calendar life, higher energy density, and better safety for large scale energy storage and vehicular applications...
September 29, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28951181/clinical-accuracy-of-customized-stereotactic-fixtures-for-stereo-eeg
#10
Hong Yu, Constantin Pistol, Ronald Franklin, Andrei Barborica
BACKGROUND: Stereo-EEG is a diagnostic methodology involving 3D exploration of brain structures using depth electrodes for locating epileptogenic foci in patients with drug-resistant epilepsy. A variety of frame-based, frameless, and robotic stereotactic systems have been designed for the accurate placement of depth electrodes. OBJECTIVES: Using the FHC microTargeting™ platform as a model, we introduce a fully customized design that has all the constructive elements positioned by a computer algorithm, according to the planned trajectories, anchoring points, and anatomical constraints...
September 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28946181/localization-of-musicogenic-epilepsy-to-heschl-s-gyrus-and-superior-temporal-plane-case-report
#11
Yasunori Nagahama, Christopher K Kovach, Michael Ciliberto, Charuta Joshi, Ariane E Rhone, Adam Vesole, Phillip E Gander, Kirill V Nourski, Hiroyuki Oya, Matthew A Howard, Hiroto Kawasaki, Brian J Dlouhy
Musicogenic epilepsy (ME) is an extremely rare form of the disorder that is provoked by listening to or playing music, and it has been localized to the temporal lobe. The number of reported cases of ME in which intracranial electroencephalography (iEEG) has been used for seizure focus localization is extremely small, especially with coverage of the superior temporal plane (STP) and specifically, Heschl's gyrus (HG). The authors describe the case of a 17-year-old boy with a history of medically intractable ME who underwent iEEG monitoring that involved significant frontotemporal coverage as well as coverage of the STP with an HG depth electrode anteriorly and a planum temporale depth electrode posteriorly...
September 15, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28946179/bone-flap-elevation-for-intracranial-eeg-monitoring-technical-note
#12
Yasunori Nagahama, Brian J Dlouhy, Daichi Nakagawa, Janina Kamm, David Hasan, Matthew A Howard, Hiroto Kawasaki
Intracranial electroencephalography (iEEG) provides invaluable information in determining seizure focus and spread due to its high spatial and temporal resolution, which are not afforded by noninvasive studies. Electrodes of various types (e.g., grid, strip, and depth electrodes) and configurations are often used for optimum coverage of suspected areas of seizure onset and propagation. Given the fixed intracranial volume and added mass effect from placement of cortical electrodes, brain edema and postoperative deficits can occur...
September 15, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28945072/oled-luminaires-device-arrays-with-99-6-geometric-fill-factor-structured-by-femtosecond-laser-ablation
#13
Joshua Fragoso García, Stefan Höfle, Min Zhang, Julian Dlugosch, Torsten Friedrich, Susanne Wagner, Alexander Colsmann
The plethora of design opportunities renders organic light emitting diodes (OLEDs) ideal luminaires for general lighting applications. Progressing from lab-scale device concepts to large-area applications calls for smart device designs that are scalable and, at the same time, unsusceptible to resistive losses within the electrodes. By employing direct pulsed femtosecond laser structuring, we fabricate OLED luminaires comprising monolithically interconnected OLED arrays. We determine the laser ablation thresholds and the optimized process parameters for all functional layers...
September 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28935942/oxygen-evolution-reaction-dynamics-monitored-by-an-individual-nanosheet-based-electronic-circuit
#14
Peiyao Wang, Mengyu Yan, Jiashen Meng, Gengping Jiang, Longbing Qu, Xuelei Pan, Jefferson Zhe Liu, Liqiang Mai
The oxygen evolution reaction involves complex interplay among electrolyte, solid catalyst, and gas-phase and liquid-phase reactants and products. Monitoring catalysis interfaces between catalyst and electrolyte can provide valuable insights into catalytic ability. But it is a challenging task due to the additive solid supports in traditional measurement. Here we design a nanodevice platform and combine on-chip electrochemical impedance spectroscopy measurement, temporary I-V measurement of an individual nanosheet, and molecular dynamic calculations to provide a direct way for nanoscale catalytic diagnosis...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28934795/comparisons-of-lesion-volumes-and-shapes-produced-by-a-radiofrequency-system-with-a-cooled-a-protruding-or-a-monopolar-probe
#15
David L Cedeno, Alejandro Vallejo, Courtney A Kelley, Dana M Tilley, Nitesh Kumar
BACKGROUND: Radiofrequency (RF) ablation for denervation has been utilized for decades in chronic pain management. This relies on the proper targeting of the affected nerve which may be obtained by creating an ablation lesion with a shape and volume that optimizes targeting. Various systems designed to improve lesion size are available. These include cooling the active tip (cooled-RF) and protruding the RF electrode outside the active tip (PERF). OBJECTIVES: This study compares lesion volumes of 3 commercially available RF systems: cooled-RF, "V" shaped active cannula and protruding electrode (18 g and 20 g), and monopolar RF (MRF; 16 g, 18 g, and 20 g)...
September 2017: Pain Physician
https://www.readbyqxmd.com/read/28933353/technical-solutions-for-simultaneous-meg-and-seeg-recordings-towards-routine-clinical-use
#16
J M Badier, A S Dubarry, M Gavaret, S Chen, A S Trébuchon, P Marquis, J Régis, F Bartolomei, C G Bénar, R Carron
OBJECTIVE: The simultaneous recording of intracerebral EEG (stereotaxic EEG, SEEG) and magnetoencephalography (MEG) is a promising strategy that provides both local and global views on brain pathological activity. Yet, acquiring simultaneous signals poses difficult technical issues that hamper their use in clinical routine. Our objective was thus to develop a set of solutions for recording a high number of SEEG channels while preserving signal quality. APPROACH: We recorded data in a patient with drug resistant epilepsy during presurgical evaluation...
September 21, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28924008/primary-generators-of-visually-evoked-field-potentials-recorded-in-the-macaque-auditory-cortex
#17
Yoshinao Kajikawa, John F Smiley, Charles E Schroeder
Prior studies have reported "local" field potential (LFP) responses to faces in the macaque auditory cortex and have suggested that such face-LFPs may be substrates of audiovisual integration. However, while field potentials (FPs) may reflect the synaptic currents of neurons near the recording electrode, due to the use of a distant reference electrode, they often reflect those of synaptic activity occurring in distant sites as well. Thus, FP recordings within a given brain region (e.g., auditory cortex) may be "contaminated" by activity generated elsewhere in the brain...
September 18, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28898173/utility-of-stereoelectroencephalography-in-children-with-dysembryoplastic-neuroepithelial-tumor-and-cortical-malformation
#18
Jun T Park, Guadalupe Fernandez Baca Vaca, Jennifer Avery, Jonathan P Miller
BACKGROUND: Uncontrolled seizures in children can contribute to irreversible cognitive impairment and developmental delay, in addition to placing them at risk for sudden unexplained death in epileptic patients (SUDEP). Since its introduction at Saint Ann Hospital in Paris in the 1960s, stereoelectroencephalography (SEEG) is increasingly being utilized at epilepsy centers in the United States as an invasive tool to help localize the seizure focus in drug-resistant focal epilepsy. INDICATIONS: Children with symptomatic epilepsy, commonly due to cortical dysplasia and dysembryoplastic neuroepithelial tumor (DNET), may benefit from SEEG investigation...
2017: Neurodiagnostic Journal
https://www.readbyqxmd.com/read/28894813/the-importance-of-electrode-location-in-cochlear-implantation
#19
REVIEW
Brendan P O'Connell, Jacob B Hunter, George B Wanna
OBJECTIVES: As indications for cochlear implantation have expanded to include patients with more residual hearing, increasing emphasis has been placed on minimally traumatic electrode insertion. Histopathologic evaluation remains the gold standard for evaluation of cochlear trauma, but advances in imaging techniques have allowed clinicians to determine scalar electrode location in vivo. This review will examine the relationship between scalar location of electrode arrays and audiologic outcomes...
December 2016: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28894243/high-capacitance-hybrid-supercapacitor-based-on-multi-colored-fluorescent-carbon-dots
#20
Rukan Genc, Melis Ozge Alas, Ersan Harputlu, Sergej Repp, Nora Kremer, Mike Castellano, Suleyman Gokhan Colak, Kasim Ocakoglu, Emre Erdem
Multi-colored, water soluble fluorescent carbon nanodots (C-Dots) with quantum yield changing from 4.6 to 18.3% were synthesized in multi-gram using dated cola beverage through a simple thermal synthesis method and implemented as conductive and ion donating supercapacitor component. Various properties of C-Dots, including size, crystal structure, morphology and surface properties along with their Raman and electron paramagnetic resonance spectra were analyzed and compared by means of their fluorescence and electronic properties...
September 11, 2017: Scientific Reports
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