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https://www.readbyqxmd.com/read/28796182/fabrication-and-characterization-of-3d-printed-highly-porous-3d-lifepo%C3%A2-electrodes-by-low-temperature-direct-writing-process
#1
Changyong Liu, Xingxing Cheng, Bohan Li, Zhangwei Chen, Shengli Mi, Changshi Lao
LiFePO₄ (LFP) is a promising cathode material for lithium-ion batteries. In this study, low temperature direct writing (LTDW)-based 3D printing was used to fabricate three-dimensional (3D) LFP electrodes for the first time. LFP inks were deposited into a low temperature chamber and solidified to maintain the shape and mechanical integrity of the printed features. The printed LFP electrodes were then freeze-dried to remove the solvents so that highly-porous architectures in the electrodes were obtained. LFP inks capable of freezing at low temperature was developed by adding 1,4 dioxane as a freezing agent...
August 10, 2017: Materials
https://www.readbyqxmd.com/read/28794194/induced-oscillations-in-turtle-cortex-are-coherent-at-the-mesoscale-of-population-activity-but-not-at-the-microscale-of-the-membrane-potential-of-neurons
#2
Mahmood Sayed Hoseini, Jeff Pobst, Nathaniel Caleb Wright, Wesley Clawson, Woodrow Shew, Ralf Wessel
Bursts of oscillatory neural activity have been hypothesized to be a core mechanism by which remote brain regions can communicate. Such hypothesis raises the question to what extent oscillations are coherent across spatially distant neural populations. To address this question, we obtained local field potential (LFP) and membrane potential recordings from the visual cortex of turtle in response to visual stimulation of the retina. The time-frequency analysis of these recordings revealed pronounced bursts of oscillatory neural activity and a large trial-to-trial variability in the spectral and temporal properties of the observed oscillations...
August 9, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28777536/in-situ-multilength-scale-tracking-of-dimensional-and-viscoelastic-changes-in-composite-battery-electrodes
#3
Vadim Dargel, Nicolas Jäckel, Netanel Shpigel, Sergey Sigalov, Mikhael D Levi, Leonid Daikhin, Volker Presser, Doron Aurbach
Intercalation-induced dimensional changes in a composite battery electrode (comprising a polymeric binder) are one of the major factors limiting electrode cycling performance. Since electrode performance is expressed by the quantities averaged over its entire surface area (e.g., capacity retention, Faradaic efficiency, rate capability), significant efforts have been made to develop a methodology allowing its facile mechanical diagnostics at the same areal scale. Herein we introduce such a generic methodology for a highly sensitive in situ monitoring of intrinsic mechanical properties of composite battery electrodes...
August 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28771568/laminar-differences-in-response-to-simple-and-spectro-temporally-complex-sounds-in-the-primary-auditory-cortex-of-ketamine-anesthetized-gerbils
#4
Markus K Schaefer, Manfred Kössl, Julio C Hechavarría
In mammals, acoustic communication plays an important role during social behaviors. Despite their ethological relevance, the mechanisms by which the auditory cortex represents different communication call properties remain elusive. Recent studies have pointed out that communication-sound encoding could be based on discharge patterns of neuronal populations. Following this idea, we investigated whether the activity of local neuronal networks, such as those occurring within individual cortical columns, is sufficient for distinguishing between sounds that differed in their spectro-temporal properties...
2017: PloS One
https://www.readbyqxmd.com/read/28771015/excess-li-ion-storage-on-reconstructed-surfaces-of-nanocrystals-to-boost-battery-performance
#5
Yandong Duan, Bingkai Zhang, Jiaxin Zheng, Jiangtao Hu, Jianguo Wen, Dean J Miller, Pengfei Yan, Tongchao Liu, Hua Guo, Wen Li, Xiaohe Song, Zengqing Zhuo, Chaokun Liu, Hanting Tang, Rui Tan, Zonghai Chen, Yang Ren, Yuan Lin, Wanli Yang, Chongmin Wang, Lin-Wang Wang, Jun Lu, Khalil Amine, Feng Pan
Because of their enhanced kinetic properties, nanocrystallites have received much attention as potential electrode materials for energy storage. However, because of the large specific surface areas of nanocrystallites, they usually suffer from decreased energy density, cycling stability, and effective electrode capacity. In this work, we report a size-dependent excess capacity beyond theoretical value (170 mAh g-1) by introducing extra lithium storage at the reconstructed surface in nanosized LiFePO4 (LFP) cathode materials (186 and 207 mAh g-1 in samples with mean particle sizes of 83-nm and 42-nm, respectively)...
August 3, 2017: Nano Letters
https://www.readbyqxmd.com/read/28758690/rearing-environment-dependent-hippocampal-local-field-potential-differences-in-wildtype-and-inositol-trisphosphate-receptor-type-2-knockout-mice
#6
Mika Tanaka, Xiaowen Wang, Katsuhiko Mikoshiba, Hajime Hirase, Yoshiaki Shinohara
Rearing in an enriched environment (ENR) is known to enhance cognitive and memory abilities in rodents, whereas social isolation (ISO) induces depression-like behaviour. The hippocampus has been documented to undergo morphological and functional changes depending on these rearing environments. For instance, rearing condition during juvenility alters CA1 stratum radiatum gamma oscillation power in rats. In this study, hippocampal CA1 local field potentials (LFP) were recorded from bilateral CA1 in urethane-anesthetized mice that were reared in either ENR or ISO condition...
July 31, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28756201/multiple-mild-traumatic-brain-injury-in-the-rat-produces-persistent-pathological-alterations-in-the-brain
#7
Diane M Brooks, Sarjubhai A Patel, Eric D Wohlgehagen, Erin O Semmens, Alan Pearce, Edmond A Sorich, Thomas F Rau
Multiple mild traumatic brain injury (mmTBI), in certain cases, produces persistent symptoms. However, the molecular mechanisms underlying these symptoms remain unclear. Here, we demonstrate extended pathological changes in the rat brain following mmTBI. Using the lateral fluid percussion (LFP) technique we exposed adult male Wistar rats to a mild TBI (mTBI) once a week for four weeks and compared them to surgical shams. At 90days following the last TBI or sham procedure the animals were cognitively tested in the Morris Water Maze (MWM), euthanized, and the brains removed for immunohistochemistry...
July 27, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28754993/neurometabolic-and-electrophysiological-changes-during-cortical-spreading-depolarization-multimodal-approach-based-on-a-lactate-glucose-dual-microbiosensor-arrays
#8
Cátia F Lourenço, Ana Ledo, Greg A Gerhardt, João Laranjinha, Rui M Barbosa
Spreading depolarization (SD) is a slow propagating wave of strong depolarization of neural cells, implicated in several neuropathological conditions. The breakdown of brain homeostasis promotes significant hemodynamic and metabolic alterations, which impacts on neuronal function. In this work we aimed to develop an innovative multimodal approach, encompassing metabolic, electric and hemodynamic measurements, tailored but not limited to study SD. This was based on a novel dual-biosensor based on microelectrode arrays designed to simultaneously monitor lactate and glucose fluctuations and ongoing neuronal activity with high spatial and temporal resolution...
July 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28725184/sevoflurane-induces-coherent-slow-delta-oscillations-in-rats
#9
Jennifer A Guidera, Norman E Taylor, Justin T Lee, Ksenia Y Vlasov, JunZhu Pei, Emily P Stephen, J Patrick Mayo, Emery N Brown, Ken Solt
Although general anesthetics are routinely administered to surgical patients to induce loss of consciousness, the mechanisms underlying anesthetic-induced unconsciousness are not fully understood. In rats, we characterized changes in the extradural EEG and intracranial local field potentials (LFPs) within the prefrontal cortex (PFC), parietal cortex (PC), and central thalamus (CT) in response to progressively higher doses of the inhaled anesthetic sevoflurane. During induction with a low dose of sevoflurane, beta/low gamma (12-40 Hz) power increased in the frontal EEG and PFC, PC and CT LFPs, and PFC-CT and PFC-PFC LFP beta/low gamma coherence increased...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28719816/sulfate-radical-induced-degradation-of-%C3%AE-2-adrenoceptor-agonists-salbutamol-and-terbutaline-phenoxyl-radical-dependent-mechanisms
#10
Lei Zhou, Mohamad Sleiman, Corinne Ferronato, Jean-Marc Chovelon, Pascal de Sainte-Claire, Claire Richard
The present study investigated the reactivity and oxidation mechanisms of salbutamol (SAL) and terbutaline (TBL), two typical β2-adrenoceptor agonists, towards sulfate radical (SO4(-)) by using photo-activated persulfate (PS). The reaction pathways and mechanisms were proposed based on products identification using high resolution HPLC-ESI-MS, laser flash photolysis (LFP) and molecular orbital calculations. The results indicated that SO4(-) was the dominant reactive species in the UV/PS process. The second-order rate constants of sulfate radical reaction with SAL and TBL were measured as (3...
July 14, 2017: Water Research
https://www.readbyqxmd.com/read/28716962/gamma-oscillations-in-the-rat-ventral-striatum-originate-in-the-piriform-cortex
#11
James E Carmichael, Jimmie M Gmaz, Matthijs A A van der Meer
Local field potentials (LFPs) recorded from the human and rodent ventral striatum (vStr) exhibit prominent, behaviorally relevant gamma-band oscillations. These oscillations are related to local spiking activity and transiently synchronize with anatomically related areas, suggesting a possible role in organizing vStr activity. However, the origin of vStr gamma is unknown. We recorded vStr gamma oscillations across a 1.4mm(2) grid spanned by 64 recording electrodes as male rats rested and foraged for rewards, revealing a highly consistent power gradient originating in the adjacent piriform cortex...
July 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28714538/the-symphony-of-smell-a-role-for-electrical-synapses
#12
Graeme Lowe
Rhythmic electrical activities are ubiquitous in the brain and inextricably tied to neural circuit operations. Macroscopic oscillations in extracellular voltage - the local field potential (LFP) - are commonly observed and span a wide frequency spectrum (∼1.5 - 100 Hz). This article is protected by copyright. All rights reserved.
July 17, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28711622/prolonged-low-level-noise-induced-plasticity-in-the-peripheral-and-central-auditory-system-of-rats
#13
Adam M Sheppard, Guang-Di Chen, Senthilvelan Manohar, Dalian Ding, Bo-Hua Hu, Wei Sun, Jiwei Zhao, Richard Salvi
Prolonged low-level noise exposure alters loudness perception in humans, presumably by decreasing the gain of the central auditory system. Here we test the central gain hypothesis by measuring the acute and chronic physiologic changes at the level of the cochlea and inferior colliculus (IC) after a 75-dB SPL, 10-20-kHz noise exposure for 5weeks. The compound action potential (CAP) and summating potential (SP) were used to assess the functional status of the cochlea and 16 channel electrodes were used to measure the local field potentials (LFP) and multi-unit spike discharge rates (SDR) from the IC immediately after and one-week post-exposure...
July 13, 2017: Neuroscience
https://www.readbyqxmd.com/read/28687506/effects-of-alkaloid-rich-extract-from-mitragyna-speciosa-korth-havil-on-naloxone-precipitated-morphine-withdrawal-symptoms-and-local-field-potential-in-the-nucleus-accumbens-of-mice
#14
Dania Cheaha, Chayaporn Reakkamnuan, Jakkrit Nukitram, Somsmorn Chittrakarn, Pimpimol Phukpattaranont, Niwat Keawpradub, Ekkasit Kumarnsit
ETHNOPHARMACOLOGICAL RELEVANCE: Mitragyna speciosa (Korth.) Havil. (M. speciosa) is among the most well-known plants used in ethnic practice of Southeast Asia. It has gained increasing attention as a plant with potential to substitute morphine in addiction treatment program. However, its action on the central nervous system is controversial. AIM OF THE STUDY: This study investigated the effects of M. speciosa alkaloid extract on naloxone-precipitated morphine withdrawal and neural signaling in the nucleus accumbens (NAc, brain reward center) of mice...
July 5, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28685185/regeneration-of-synapses-in-the-olfactory-pathway-of-locusts-after-antennal-deafferentation
#15
Hannah Wasser, Michael Stern
The olfactory pathway of the locust is capable of fast and precise regeneration on an anatomical level. Following deafferentation of the antenna either of young adult locusts, or of fifth instar nymphs, severed olfactory receptor neurons (ORNs) reinnervate the antennal lobe (AL) and arborize in AL microglomeruli. In the present study we tested whether these regenerated fibers establish functional synapses again. Intracellular recordings from AL projection neurons revealed that the first few odor stimulus evoked postsynaptic responses from regenerated ORNs from day 4-7 post crush on...
July 6, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28661136/insertable-no-co-microsensors-recording-gaseous-vasomodulators-reflecting-differential-neuronal-activation-level-with-respect-to-seizure-focus
#16
Yejin Ha, Youngmi Lee, Minah Suh
Nitric oxide (NO) and carbon monoxide (CO) are important signaling molecules shaping vasomodulation. This paper reports simultaneous in vivo monitoring of NO, CO and dendritic summation of action potential at three different cortical regions: seizure focus and two additional places, vertically and horizontally separated by 1.2 mm from the seizure focus, during epileptic seizure induced by 4-aminopyrindine injection. An amperometric dual microsensor having a high spatiotemporal resolution monitored fast and dynamic changes of NO and CO, and neural changes were recorded with a glass pipette electrode for local field potential (LFP)...
June 29, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28660418/basal-forebrain-activation-enhances-between-trial-reliability-of-low-frequency-local-field-potentials-lfp-and-spiking-activity-in-tree-shrew-primary-visual-cortex-v1
#17
Paolo De Luna, Julia Veit, Gregor Rainer
Brain state has profound effects on neural processing and stimulus encoding in sensory cortices. While the synchronized state is dominated by low-frequency local field potential (LFP) activity, low-frequency LFP power is suppressed in the desynchronized state, where a concurrent enhancement in gamma power is observed. Recently, it has been shown that cortical desynchronization co-occurs with enhanced between-trial reliability of spiking activity in sensory neurons, but it is currently unclear whether this effect is also evident in LFP signals...
June 28, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28658617/reliable-and-elastic-propagation-of-cortical-seizures-in%C3%A2-vivo
#18
Michael Wenzel, Jordan P Hamm, Darcy S Peterka, Rafael Yuste
Mapping the fine-scale neural activity that underlies epilepsy is key to identifying potential control targets of this frequently intractable disease. Yet, the detailed in vivo dynamics of seizure progression in cortical microcircuits remain poorly understood. We combine fast (30-Hz) two-photon calcium imaging with local field potential (LFP) recordings to map, cell by cell, the spread of locally induced (4-AP or picrotoxin) seizures in anesthetized and awake mice. Using single-layer and microprism-assisted multilayer imaging in different cortical areas, we uncover reliable recruitment of local neural populations within and across cortical layers, and we find layer-specific temporal delays, suggesting an initial supra-granular invasion followed by deep-layer recruitment during lateral seizure spread...
June 27, 2017: Cell Reports
https://www.readbyqxmd.com/read/28642341/use-of-intraoperative-local-field-potential-spectral-analysis-to-differentiate-basal-ganglia-structures-in-parkinson-s-disease-patients
#19
Rachel Kolb, Aviva Abosch, Gidon Felsen, John A Thompson
Identification of brain structures traversed during implantation of deep brain-stimulating (DBS) electrodes into the subthalamic nucleus (STN-DBS) for the treatment of Parkinson's disease (PD) frequently relies on subjective correspondence between kinesthetic response and multiunit activity. However, recent work suggests that local field potentials (LFP) could be used as a more robust signal to objectively differentiate subcortical structures. The goal of this study was to analyze the spectral properties of LFP collected during STN-DBS in order to objectively identify commonly traversed brain regions and improve our understanding of aberrant oscillations in the PD-related pathophysiological cortico-basal ganglia network...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28638715/rat-intersubjective-decisions-are-encoded-by-frequency-specific-oscillatory-contexts
#20
Jana Schaich Borg, Sanvesh Srivastava, Lizhen Lin, Joseph Heffner, David Dunson, Kafui Dzirasa, Luis de Lecea
INTRODUCTION: It is unknown how the brain coordinates decisions to withstand personal costs in order to prevent other individuals' distress. Here we test whether local field potential (LFP) oscillations between brain regions create "neural contexts" that select specific brain functions and encode the outcomes of these types of intersubjective decisions. METHODS: Rats participated in an "Intersubjective Avoidance Test" (IAT) that tested rats' willingness to enter an innately aversive chamber to prevent another rat from getting shocked...
June 2017: Brain and Behavior
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