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Depth electrode

L Benedetto, M Rivas, M Pereira, A Ferreira, P Torterolo
Mother rats spend most of their time nursing their litter during the early stages of the postpartum period, only occasionally leaving the nest. The suckling stimulus from the pups elicits the adoption of nursing postures, during which milk ejection occurs, an event associated with the occurrence of non-REM (NREM) sleep in the rat. Despite this evidence, the characteristics of sleep during different nursing postures along the postpartum period remain unknown. The present study aims to describe the sleep pattern of mother rats while nursing, hovering over their pups and when being away from the pups...
September 1, 2017: Archives Italiennes de Biologie
Huayun Li, Huibin Jia, Dongchuan Yu
Using behavioral measures and ERP technique, researchers discovered at least two factors could influence the final perception of depth in Panum's limiting case, which are the vertical disparity gradient and the degree of cue conflict between 2D and 3D shapes. Although certain ERP components have been proved to be sensitive to the different levels of these two factors, some methodological limitations existed in this technique. In this study, we proposed that the omega complexity of EEG signal may serve as an important supplement of the traditional ERP technique...
December 6, 2017: Journal of Neurophysiology
Ambroise Quesne-Turin, Germain Vallverdu, Delphine Flahaut, Joachim Allouche, Laurence Croguennec, Michel Ménétrier, Isabelle Baraille
This paper focuses on the surface reactivity of two spinel samples with different stoichiometries and crystal morphologies, namely Li1+xMn2-xO4 with x = 0.05 and x = 0.10. LiMn2O4 compounds are good candidates as positive electrode of high power lithium-ion batteries for portable devices. The samples were investigated using both experimental and theoretical approaches. On the experimental point of view there were characterized in depth from XRD, SEM and XPS analyses. Then the reactivity was investigated through the adsorption of (SO2) gaseous probes, in controlled conditions, followed by XPS characterization...
December 6, 2017: ACS Applied Materials & Interfaces
Mehmet Soner Gözü, Reyhan Zengin, Nevzat Guneri Gencer
In this study, the performance and implementation of magneto-acousto-electric tomography (MAET) is investigated using a linear phased array (LPA) transducer. The goal of MAET is to image the conductivity distribution in biological bodies. It uses the interaction between ultrasound and a static magnetic field to generate velocity current density distribution inside the body. The resultant voltage due to velocity current density is sensed by surface electrodes attached on the body. In this study, the theory of MAET is reviewed...
December 5, 2017: Physics in Medicine and Biology
Jianing An, Truong-Son Dinh Le, Yi Huang, Zhaoyao Zhan, Yong Li, Lianxi Zheng, Wei Huang, Gengzhi Sun, Young-Jin Kim
Non-contact electronic skin (e-skin), which possesses superior long-range and high-spatial-resolution sensory properties, is becoming indispensable in fulfilling the emulation of human sensation via prosthetics. Here we present an advanced design and fabrication of all-graphene-based highly flexible non-contact e-skins by virtue of femtosecond laser direct writing (FsLDW). The photo-reduced graphene oxide patterns function as the conductive electrodes, while the pristine graphene oxide thin film serves as the sensing layer...
December 5, 2017: ACS Applied Materials & Interfaces
Alon Kosloff, Eran Granot, Zahava Barkay, Fernando Patolsky
The highly-controlled formation of 'radial' silicon/NiSi core-shell nanowire heterostructures has been demonstrated for the first time. Here, we investigated the 'radial' diffusion of nickel atoms into crystalline nanoscale silicon pillar cores, followed by nickel silicide phase formation and the creation of a well-defined shell structures. The described approach is based on a two-step thermal process, which involves metal diffusion at low temperatures in the range of 200-400oC, followed by a thermal curing step at a higher temperature of 400oC...
December 3, 2017: Nano Letters
Hongen Wang, Xu Zhao, Kaili Yin, Yu Li, Lihua Chen, Xiao-Yu Yang, WenJun Zhang, Bao-Lian Su, Guozhong Cao
Vanadium oxides are promising anode materials for lithium ion batteries (LIBs) due to their high capacity, good safety and low cost. However, their practical application has been deferred by the poor rate capability and cycling stability. In this work, we report the designed synthesis of porous V2O3/VO2@carbon heterostructure electrode for high performance LIBs. The synergic effects of porous nanostructures, phase hybridization with self-building electric field at heterointerface, and conductive carbon implantation effectively enhance the electronic/ionic conduction and buffer the volume variation in the composite material...
December 1, 2017: ACS Applied Materials & Interfaces
Carolina G Ferroni, Monica Maranesi, Alessandro Livi, Marco Lanzilotto, Luca Bonini
Intracortical microstimulation (ICMS) is one of the most widely employed techniques for providing causal evidence of the relationship between neuronal activity and specific motor, perceptual, or even cognitive functions. In recent years, several new types of linear multielectrode silicon probes have been developed, allowing researchers to sample neuronal activity at different depths along the same cortical site simultaneously and with high spatial precision. Nevertheless, silicon multielectrode probes have been rarely employed for ICMS studies and, more importantly, it is unknown whether and to what extent they can be used for combined recording and stimulation experiments...
2017: Frontiers in Systems Neuroscience
Enrico Ferrea, Lalitta Suriya-Arunroj, Dirk Hoehl, Uwe Thomas, Alexander Gail
Acute neuronal recordings performed with metal microelectrodes in non-human primates allow investigating the neural substrate of complex cognitive behaviors. Yet, the daily re-insertion and positioning of the electrodes prevents recording from many neurons simultaneously, limiting the suitability of these types of recordings for brain-computer-interface applications or for large-scale population statistical methods on a trial-by-trial basis. In contrast, chronically implanted multi-electrode arrays offer the opportunity to record from many neurons simultaneously, but immovable electrodes prevent optimization of the signal during and after implantation and cause the tissue response to progressively impair the transduced signal quality, thereby limiting the number of different neurons that can be recorded over the lifetime of the implant...
November 29, 2017: Journal of Neurophysiology
Qun Li, Xianfu Wang, Kai Tang, Mengfan Wang, Chao Wang, Chenglin Yan
Cu-based electrocatalysts have seldom been studied for water oxidation because of their inferior activity and poor stability regardless of their low cost and environmentally benign nature. Therefore, exploring an efficient way to improve the activity of Cu-based electrocatalysts is very important for their practical application. Modifying electronic structure of the electrocatalytically active center of electrocatalysts by metal doping to favor the electron transfer between catalyst active sites and electrode is an important approach to optimize hydrogen and oxygen species adsorption energy, thus leading to the enhanced intrinsic electrocatalytic activity...
November 27, 2017: ACS Nano
Richard F Schmidt, Michael J Lang, Christian M Hoelscher, Pascal M Jabbour, Stavropoula I Tjoumakaris, Ashwini D Sharan, Chengyuan Wu
OBJECTIVE: Stereoelectroencephalography (sEEG) requires extensive preoperative planning to optimize placement of electrodes and limit the potential for complications. Flat-detector computed tomography (FD-CT) has previously been used for peri-operative vascular imaging to guide the treatment of vascular lesions. This imaging modality provides a detailed depiction of cerebrovascular and bony cranial anatomy, which can be used to guide intracranial electrode implantation. We have developed a novel method to improve preoperative planning for sEEG electrode implantation and limit the potential for postoperative complications by using FD-CT imaging merged with preoperative magnetic resonance imaging...
November 22, 2017: World Neurosurgery
Seo-Young An, Chang-Hyeon An, Kyu-Yup Lee, Jeong Hun Jang, Yun-Hoon Choung, Sang Heun Lee
OBJECTIVE: To assess the usefulness of cone beam computed tomography (CBCT) for characterizing electrode insertion and evaluate the influence of electrode insertion status on post-cochlear implantation (CI) outcomes. DESIGN: Twenty-six ears with post-CI CBCT scans were included. The devices were MED-EL Flex28 (n = 21) and Nucleus slim straight (n = 5). The parameters including cochlear duct length (CDL), insertion depth angle (IDA), insertion length of electrode (IL), and cochlear coverage (CC) were analyzed and compared with aided pure-tone threshold (PTA) with implant in free field, and open-set sentence score...
November 26, 2017: Acta Oto-laryngologica
Ana González-Suárez, David Herranz, Enrique Berjano, Jose L Rubio-Guivernau, Eduardo Margallo-Balbás
BACKGROUND/OBJECTIVE: Radiofrequency (RF) catheter ablation is a minimally invasive medical procedure used to thermally destroy the focus of cardiac arrhythmias. Novel optical techniques are now being integrated into RF catheters in order to detect the changes in tissue properties. Loss of birefringence due to fiber denaturation at around 70°C is related to changes in accumulated phase retardation and can be measured by polarization-sensitive optical coherence reflectometry (PS-OCR)...
November 23, 2017: Lasers in Surgery and Medicine
Jong Tae Lim, Jaesu Kim, Hyunkoo Lee, Jaehyun Moon, Byoung-Hwa Kwon, Seongdeok Ahn, Nam Sung Cho, Byung-Wook Ahn, Jeong-Ik Lee, Kyuwook Ihm, Seong Chu Lim
With increasing demand for transparent conducting electrode, graphene has attracted considerable attention, owing to its high electrical conductivity, high transmittance, low reflectance, flexibility and tunable work function. Two faces of single layer graphene are indistinguishable in its nature and this idea has not been doubted even in multilayered graphene (MLG) because it is difficult to separately characterize the front (first-born) and rear face (last-born) of MLG by using conventional analysis tools, such as Raman, ultraviolet spectroscopy, scanning probe microscopy, and sheet resistance...
November 21, 2017: ACS Applied Materials & Interfaces
Pratik Rohatgi, Ryan J Jafrani, Nicholas J Brandmeir, Frank G Gilliam, Tiffany L Fisher, Michael D Sather
BACKGROUND: Patients with bitemporal lobe epilepsy are generally not considered for surgical resection. Fortunately, responsive neurostimulation proves another avenue for the management of this challenging disease process. In conjunction with our epileptologist, we consider responsive neurostimulation for patients who have clinical features of temporal lobe epilepsy without clear localization on imaging and stereo-EEG. METHODS: Here we describe our technique for implanting a responsive neurostimulator (NeuroPace, NeuroPace Inc...
November 14, 2017: World Neurosurgery
Dorothea Miller, Patrick Carney, John S Archer, Gregory J Fitt, Graeme D Jackson, Kristian J Bulluss
Bottom of sulcus dysplasias (BOSDs) are localized focal cortical dysplasias (FCDs) centred on the bottom of a sulcus that can be highly epileptogenic, but difficult to delineate intraoperatively. We report on a patient with refractory epilepsy due to a BOSD, successfully resected with the aid of a multimodal surgical approach using neuronavigation based on MRI and PET, intraoperative ultrasound (iUS) and electrocorticography (ECoG) using depth electrodes. The lesion could be visualized on iUS showing an increase in echogenicity at the grey-white matter junction...
November 11, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
Yu-Jiao Zhang, Jin Qu, Shu-Meng Hao, Wei Chang, Qiu-Yu Ji, Zhong-Zhen Yu
Increasing demands for lithium-ion batteries (LIBs) with high energy density and high power density require highly reversible electrochemical reactions to enhance the cyclability and capacities of electrodes. As the reversible formation/decomposition of the solid electrolyte interface (SEI) film during the lithiation/delithiation process of Fe3S4 could bring about a higher capacity than its theoretical value, in the present work, synthesized Fe3S4 nanoparticles are sandwich-wrapped with reduced graphene oxide (RGO) to fabricate highly reversible and long cycling life anode materials for high-performance LIBs...
November 21, 2017: ACS Applied Materials & Interfaces
Kai Zhang, Fang Ren, Xuelong Wang, Enyuan Hu, Yahong Xu, Xiao-Qing Yang, Hong Li, Liquan Chen, Piero Pianetta, Apurva Mehta, Xiqian Yu, Yijin Liu
The in-depth understanding of the minority phases' roles in functional materials, e.g., batteries, is critical for optimizing the system performance and the operational efficiency. Although the visualization of battery electrode under operating conditions has been demonstrated, the development of advanced data-mining approaches is still needed in order to identify minority phases and to understand their functionalities. The present study uses nanoscale X-ray spectromicroscopy to study a functional LiCoO2/Li battery pouch cell...
November 10, 2017: Nano Letters
Hanna Ljung, Arto Nordlund, Maria Strandberg, Johan Bengzon, Kristina Källén
OBJECTIVE: To explore whether patients with refractory mesial temporal lobe epilepsy risk aggravated verbal memory loss from intracranial electroencephalography (EEG) recording with longitudinal hippocampal electrodes in the language-dominant hemisphere. METHODS: A long-term neuropsychological follow-up (mean 61.5 months, range 22-111 months) was performed in 40 patients after ictal registration with left hippocampal depth electrodes (study group, n = 16) or no invasive EEG, only extracranial registration (reference group, n = 24)...
November 3, 2017: Epilepsia
P Mittmann, A Ernst, I Todt
BACKGROUND: Preservation of residual hearing is one of the major goals in modern cochlear implant surgery. Intra-cochlear fluid pressure changes influence residual hearing, and should be kept low before, during and after cochlear implant insertion. METHODS: Experiments were performed in an artificial cochlear model. A pressure sensor was inserted in the apical part. Five insertions were performed on two electrode arrays. Each insertion was divided into three parts, and statistically evaluated in terms of pressure peak frequency and pressure peak amplitude...
November 6, 2017: Journal of Laryngology and Otology
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