keyword
MENU ▼
Read by QxMD icon Read
search

Depth electrode

keyword
https://www.readbyqxmd.com/read/28508474/interrogation-of-a-ps1-based-photocathode-by-means-of-scanning-photoelectrochemical-microscopy
#1
Fangyuan Zhao, Nicolas Plumeré, Marc M Nowaczyk, Adrian Ruff, Wolfgang Schuhmann, Felipe Conzuelo
In the development of photosystem-based energy conversion devices, the in-depth understanding of electron transfer processes involved in photocurrent generation and possible charge recombination is essential as a basis for the development of photo-bioelectrochemical architectures with increased efficiency. The evaluation of a bio-photocathode based on photosystem 1 (PS1) integrated within a redox hydrogel by means of scanning photoelectrochemical microscopy (SPECM) is reported. The redox polymer acts as a conducting matrix for the transfer of electrons from the electrode surface to the photo-oxidized P700 centers within PS1, while methyl viologen is used as charge carrier for the collection of electrons at the reduced FB site of PS1...
May 16, 2017: Small
https://www.readbyqxmd.com/read/28502161/formation-and-inhibition-of-metallic-lithium-microstructures-in-lithium-batteries-driven-by-chemical-crossover
#2
Wangda Li, Un-Hyuck Kim, Andrei Dolocan, Yang-Kook Sun, Arumugam Manthiram
The formation of metallic lithium microstructures in the form of dendrites or mosses at the surface of anode electrodes (e.g., lithium metal, graphite, and silicon) leads to rapid capacity fade and poses grave safety risks in rechargeable lithium batteries. We present here a direct, relative quantitative analysis of lithium deposition on graphite anodes in pouch cells under normal operating conditions, paired with a model cathode material, the layered nickel-rich oxide LiNi0.61Co0.12Mn0.27O2, over the course of 3000 charge-discharge cycles...
May 16, 2017: ACS Nano
https://www.readbyqxmd.com/read/28499987/evoked-potentials-in-final-epoch-of-self-initiated-hand-movement-a-study-in-patients-with-depth-electrodes
#3
Miloslav Kukleta, Alena Damborská, Baris Turak, Jacques Louvel
Comparison between the intended and performed motor action can be expected to occur in the final epoch of a voluntary movement. In search for electrophysiological correlates of this mental process the purpose of the current study was to identify intracerebral sites activated in final epoch of self-paced voluntary movement. Intracerebral EEG was recorded from 235 brain regions of 42 epileptic patients who performed self-paced voluntary movement task. Evoked potentials starting at 0 to 243ms after the peak of averaged, rectified electromyogram were identified in 21 regions of 13 subjects...
May 10, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28481552/lio2-cryosynthesis-and-chemical-electrochemical-reactivities
#4
Xinmin Zhang, Limin Guo, Linfeng Gan, Yantao Zhang, Jing Wang, Lee R Johnson, Peter G Bruce, Zhangquan Peng
The reduction of O2 to solid Li2O2, via the intermediates O2(-) and LiO2, is the desired discharge reaction at the positive electrode of the aprotic Li-O2 batteries. In practice, a plethora of byproducts are identified together with Li2O2 and have been assigned to the side reactions between the reduced oxygen species (O2(-), LiO2, and Li2O2) and the battery components (the cathode and electrolyte). Understanding the reactivity of these reduced oxygen species is critical for the development of stable battery components and thus high cycle life...
May 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28477370/quantitative-ionization-chamber-alignment-to-a-water-surface-theory-and-simulation
#5
Jeffrey V Siebers, James D Ververs, Frédéric Tessier
PURPOSE: To examine the response properties of cylindrical cavity ionization chambers (ICs) in the depth-ionization buildup region so as to obtain a robust chamber-signal-based method for definitive water surface identification, hence absolute ionization chamber depth localization. METHOD & MATERIALS: An analytical model with simplistic physics and geometry is developed to explore the theoretical aspects of ionization chamber response near a phantom water surface...
May 5, 2017: Medical Physics
https://www.readbyqxmd.com/read/28463265/optimized-depth-of-field-methodology-using-annular-liquid-crystal-modulator-assisted-by-image-processing
#6
Naama Shukrun, Asi Solodar, Amir Aizen, Isaac August, Iftach Klapp, Yitzhak Yitzhaky, Ibrahim Abdulhalim
An optical-digital tunable depth of field (DOF) methodology is presented. The suggested methodology forms a fused image based on the sharpest similar depth regions from a set of source images taken with different phase masks. Each phase mask contains a different degree of DOF extension and is implemented by using an annular liquid crystal spatial light modulator, which consists of 16-ring electrodes positioned in the pupil plane. A detailed description of the optical setup and characterization of selected pupil phase masks as well as optimization of the binary phase mask for maximal DOF extension is presented...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28452772/electrochemically-assisted-ammonia-recovery-from-wastewater-using-a-floating-electrode
#7
Tim H Muster, Johannes Jermakka
This work presents and explores a novel methodology for the removal and recovery of ammonia from wastewater based upon two mechanisms: electrochemical oxidation and a previously unreported electrochemically-assisted surface transfer mechanism. Recovery of ammonia is enabled by placing a porous cathodic electrode at the wastewater-air interface. In this configuration, the cathode creates local alkalinity and an electric field that draws ammonium ions towards the wastewater-air interface, resulting in near-linear reductions of dissolved ammonium irrespective of concentration...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28441637/subtle-pathological-changes-in-neocortical-temporal-lobe-epilepsy
#8
Juan G Ochoa, Diana Hentgarden, Audrey Paulzak, Melissa Ogden, Richard Pryson, Markus Lamle, Walter G Rusyniak
This was a prospective observational study to correlate the clinical symptoms, electrophysiology, imaging, and surgical pathology of patients with temporal lobe epilepsy (TLE) without hippocampal sclerosis. We selected consecutive patients with TLE and normal MRI undergoing temporal lobe resection between April and September 2015. Clinical features, imaging, and functional data were reviewed. Intracranial monitoring and language mapping were performed when it was required according to our team recommendation...
April 22, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28431363/nanomaterial-based-electrochemical-sensors-for-arsenic-a-review
#9
REVIEW
Sureshkumar Kempahanumakkagari, Akash Deep, Ki-Hyun Kim, Suresh Kumar Kailasa, Hye-On Yoon
The existence of arsenic in the environment poses severe global health threats. Considering its toxicity, the sensing of arsenic is extremely important. Due to the complexity of environmental and biological samples, many of the available detection methods for arsenic have serious limitations on selectivity and sensitivity. To improve sensitivity and selectivity and to circumvent interferences, different electrode systems have been developed based on surface modification with nanomaterials including carbonaceous nanomaterials, metallic nanoparticles (MNPs), metal nanotubes (MNTs), and even enzymes...
September 15, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28424292/loss-and-recovery-of-functional-connectivity-in-cultured-cortical-networks-exposed-to-hypoxia
#10
Joost le Feber, Niels Erkamp, Michel J A M van Putten, Jeannette Hofmeijer
In the core of a brain infarct, loss of neuronal function is followed by neuronal death within minutes. In an area surrounding the core (penumbra), some perfusion remains. Here, neurons initially remain structurally intact, but massive synaptic failure strongly reduces neural activity. Activity in the penumbra may eventually recover or further deteriorate towards massive cell death. Besides activity recovery, return of brain functioning requires restoration of connectivity. However, low activity has been shown to initiate compensatory mechanisms that affect network connectivity...
April 19, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28389718/oscillatory-reactivity-to-effortful-cognitive-processing-in-the-subthalamic-nucleus-and-internal-pallidum-a-depth-electrode-eeg-study
#11
Martina Bočková, Jan Chládek, Pavel Jurák, Josef Halámek, Steven Z Rapcsak, Marek Baláž, Jan Chrastina, Ivan Rektor
This study investigates how complex motor-cognitive activities are processed in the subthalamic nucleus (STN) and internal globus pallidum (GPi), as adverse neuropsychiatric effects may accompany deep brain stimulation (DBS), mainly in Parkinson's disease (PD) and STN-DBS. Dystonia patients with GPi-DBS electrodes (n = 5) and PD subjects (n = 5) with STN-DBS electrodes performed two tasks: (1) copying letters; and (2) writing any letter other than that appearing on the monitor. The cognitive load of the second task was greater than that of the first...
April 7, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28386924/subdural-grid-and-depth-electrode-monitoring-in-pediatric-patients
#12
Jesse Skoch, P David Adelson, Sanjiv Bhatia, Hansel M Greiner, Bertil Rydenhag, Didier Scavarda, Francesco T Mangano
Invasive electroencephalographic monitoring with implantable subdural electrodes and intraparenchymal depth electrodes has become a basic tenet of epilepsy surgery. Improved localization of epileptic foci justifies the secondary procedure and monitoring period in many patients. Informed use of invasive monitoring in conjunction with imaging and functional studies makes epilepsy surgery a smaller, safer, and more effective endeavor. Herein we review the history, indications, implementation, and foreseeable future of grid, strip, and depth electrode use...
April 2017: Epilepsia
https://www.readbyqxmd.com/read/28386920/insular-epilepsy-surgery
#13
Pramote Laoprasert, Jeffrey G Ojemann, Michael H Handler
Since it was originally described nearly 70 years ago, insular epilepsy has been increasingly recognized and may explain failures after apparently well-planned operations. We review the history of awareness of the phenomenon, techniques for its assessment, and its surgical management. Insular epilepsy can mimic features of frontal, parietal, or temporal seizures. It should be considered when a combination of somatosensory, visceral, and motor symptoms is observed early in a seizure. Extraoperative intracranial recordings are required to accurately diagnose insular seizures...
April 2017: Epilepsia
https://www.readbyqxmd.com/read/28377210/similar-patterns-of-neural-activity-predict-memory-function-during-encoding-and-retrieval
#14
James E Kragel, Youssef Ezzyat, Michael R Sperling, Richard Gorniak, Gregory A Worrell, Brent M Berry, Cory Inman, Jui-Jui Lin, Kathryn A Davis, Sandhitsu R Das, Joel M Stein, Barbara C Jobst, Kareem A Zaghloul, Sameer A Sheth, Daniel S Rizzuto, Michael J Kahana
Neural networks that span the medial temporal lobe (MTL), prefrontal cortex, and posterior cortical regions are essential to episodic memory function in humans. Encoding and retrieval are supported by the engagement of both distinct neural pathways across the cortex and common structures within the medial temporal lobes. However, the degree to which memory performance can be determined by neural processing that is common to encoding and retrieval remains to be determined. To identify neural signatures of successful memory function, we administered a delayed free-recall task to 187 neurosurgical patients implanted with subdural or intraparenchymal depth electrodes...
April 2, 2017: NeuroImage
https://www.readbyqxmd.com/read/28374623/retrospective-evaluation-of-a-technique-for-patient-customized-placement-of-precurved-cochlear-implant-electrode-arrays
#15
Jianing Wang, Benoit M Dawant, Robert F Labadie, Jack H Noble
Objective Precurved electrode arrays (EAs) are commonly used in cochlear implants (CIs). Modiolar placement of such arrays has been shown to lead to better hearing outcomes. In this project, we retrospectively evaluated the modiolar positioning of EAs within a large CI imaging database. We aimed to discover the rate at which perimodiolar placement is successfully achieved and to evaluate a new technique we propose to preoperatively plan patient-customized EA insertion depths to improve perimodiolar placement at the time of surgery...
March 1, 2017: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/28372436/three-dimensional-measurement-with-an-electrically-tunable-focused-plenoptic-camera
#16
Yu Lei, Qing Tong, Zhaowei Xin, Dong Wei, Xinyu Zhang, Jing Liao, Haiwei Wang, Changsheng Xie
A liquid crystal microlens array (LCMLA) with an arrayed microhole pattern electrode based on nematic liquid crystal materials using a fabrication method including traditional UV-photolithography and wet etching is presented. Its focusing performance is measured under different voltage signals applied between the electrodes of the LCMLA. The experimental outcome shows that the focal length of the LCMLA can be tuned easily by only changing the root mean square value of the voltage signal applied. The developed LCMLA is further integrated with a main lens and an imaging sensor to construct a LCMLA-based focused plenoptic camera (LCFPC) prototype...
March 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28367628/in-vitro-analysis-of-dna-protein-interactions-in-gene-transcription-using-dnazyme-based-electrochemical-assay
#17
Chao Li, Yaqin Tao, Yi Yang, Yang Xiang, Genxi Li
The interaction between protein and DNA elements controls a variety of functions of genomes. The development of a convenient and cost-effective method for investigating the sequence specificity of DNA-binding proteins represents an important challenge. In response, we have introduced an electrochemical assay in this work for specific and sensitive analysis of interaction between protein and nucleic acid in nucleic extracts, based on the protein-induced distinctive motion behavior of DNA deoxyribozyme (DNAzyme) on an electrode surface...
April 12, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28367568/evaporation-induced-nanoparticle-binder-interaction-in-electrode-film-formation
#18
Zhixiao Liu, David L Wood, Partha P Mukherjee
Processing induced nanoparticle agglomeration and binder distribution affect the electrode microstructure formation and corresponding electrochemical performance in lithium-ion batteries. In the present study, stochastic dynamics computations based on a morphologically detailed mesoscale model are performed to illustrate the microstructural variability of electrode films affected by the evaporation condition (drying temperature) and the binder length (molecular weight). Micropores are observed at the surface of the electrode film when dried at a lower temperature...
April 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28367117/representation-of-glossy-material-surface-in-ventral-superior-temporal-sulcal-area-of-common-marmosets
#19
Naohisa Miyakawa, Taku Banno, Hiroshi Abe, Toshiki Tani, Wataru Suzuki, Noritaka Ichinohe
The common marmoset (Callithrix jacchus) is one of the smallest species of primates, with high visual recognition abilities that allow them to judge the identity and quality of food and objects in their environment. To address the cortical processing of visual information related to material surface features in marmosets, we presented a set of stimuli that have identical three-dimensional shapes (bone, torus or amorphous) but different material appearances (ceramic, glass, fur, leather, metal, stone, wood, or matte) to anesthetized marmoset, and recorded multiunit activities from an area ventral to the superior temporal sulcus (STS) using multi-shanked, and depth resolved multi-electrode array...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28361249/does-trajectory-matter-a-study-looking-into-the-relationship-of-trajectory-with-target-engagement-and-error-accommodation-in-subthalamic-nucleus-deep-brain-stimulation
#20
David Anthony Steel, Surajit Basu
BACKGROUND: Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is now a key treatment choice for advanced Parkinson's disease. The optimum target area within the STN is well established. However, no emphasis on the impact of trajectory exists. The ellipsoid shape of the STN and the off-centre traditional target point mean that variation in the electrode inclination should affect STN engagement. Understanding of this relationship could inform trajectory selection during planning by improving STN engagements and margins for error...
March 30, 2017: Acta Neurochirurgica
keyword
keyword
30338
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"