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Local field potential

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https://www.readbyqxmd.com/read/28102897/controls-on-methane-occurrences-in-shallow-aquifers-overlying-the-haynesville-shale-gas-field-east-texas
#1
Jean-Philippe Nicot, Toti Larson, Roxana Darvari, Patrick Mickler, Michael Slotten, Jordan Aldridge, Kristine Uhlman, Ruth Costley
Understanding the source of dissolved methane in drinking-water aquifers is critical for assessing potential contributions from hydraulic fracturing in shale plays. Shallow groundwater in the Texas portion of the Haynesville Shale area (13,000 km(2) ) was sampled (70 samples) for methane and other dissolved light alkanes. Most samples were derived from the fresh water bearing Wilcox formations and show little methane except in a localized cluster of 12 water wells (17% of total) in a approximately 30 × 30 km(2) area in Southern Panola County with dissolved methane concentrations less than 10 mg/L...
January 19, 2017: Ground Water
https://www.readbyqxmd.com/read/28102827/a-low-cost-scalable-current-sensing-digital-headstage-for-high-channel-count-%C3%A2%C2%B5ecog
#2
Michael Trumpis, Michele Insanally, Jialin Zou, Ashraf ElSharif, Ali Ghomashchi, N Sertac Artan, Robert Froemke, Jonathan Viventi
OBJECTIVE: High channel count electrode arrays allow for the monitoring of large-scale neural activity at high spatial resolution. Implantable arrays featuring many recording sites require compact, high bandwidth front-end electronics. In the present study, we investigated the use of a small, light weight, and low cost digital current-sensing integrated circuit for acquiring cortical surface signals from a 61-channel micro-electrocorticographic (��ECoG) array. APPROACH: We recorded both acute and chronic ��ECoG signal from rat auditory cortex using our novel digital current-sensing headstage...
January 19, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28102384/predicting-point-defect-equilibria-across-oxide-hetero-interfaces-model-system-of-zro2-cr2o3
#3
Jing Yang, Mostafa Youssef, Bilge Yildiz
We present a multi-scale approach to predict equilibrium defect concentrations across oxide/oxide hetero-interfaces. There are three factors that need to be taken into account simultaneously for computing defect redistribution around the hetero-interfaces: the variation of local bonding environment at the interface as epitomized in defect segregation energies, the band offset at the interface, and the equilibration of the chemical potentials of species and electrons via ionic and electronic drift-diffusion fluxes...
January 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28101853/investigation-on-the-effects-of-the-formation-of-a-silver-flower-like-structure-on-graphene
#4
Rozalina Zakaria, Siti Fatimah Az Zahra Yusoff, Kok Chung Law, Chin Seong Lim, Harith Ahmad
In this report, we experimentally investigate the formation of "flower-like silver structures" on graphene. Using an electrochemical deposition technique with deposition times of 2.5 and 5 min, agglomerations of silver nanoparticles (AgNPs) were deposited on the graphene surfaces, causing the formation of "flower-like structures" on the graphene substrate. Localized surface plasmon resonance (LSPR) was observed in the interaction between the structures and the graphene substrate. The morphology of the samples was observed using a field-emission scanning electron microscope (FESEM) and Raman spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28100654/dissociation-between-sustained-single-neuron-spiking-%C3%AE-rhythmicity-and-transient-%C3%AE-lfp-oscillations-in-primate-motor-cortex
#5
Michael Everett Rule, Carlos E Vargas-Irwin, John P Donoghue, Wilson Truccolo
Determining the relationship between single-neuron spiking and transient (~20 Hz) beta local field potential (β-LFP) oscillations is an important step for understanding the role of these oscillations in motor cortex. We show that while motor cortex firing rates and beta spiking rhythmicity remain sustained during steady-state movement preparation periods, β-LFP oscillations emerge, in contrast, as short transient events. Single-neuron mean firing rates within and outside transient β-LFP events showed no differences, and no consistent correlation was found between the beta oscillations' amplitude and firing rates, as was the case for movement and visual-cue related β-LFP suppression...
January 18, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28099770/cryptic-lineages-of-a-common-alpine-mayfly-show-strong-life-history-divergence
#6
Marie Leys, Irene Keller, Christopher T Robinson, Katja Räsänen
Understanding ecological divergence of morphologically similar but genetically distinct species ̶ previously considered as a single morphospecies ̶ is of key importance in evolutionary ecology and conservation biology. Despite their morphological similarity, cryptic species may have evolved distinct adaptations. If such ecological divergence is unaccounted for, any predictions about their responses to environmental change and biodiversity loss may be biased. We used spatio-temporally replicated field surveys of larval cohort structure and population genetic analyses (using nuclear microsatellite markers) to test for life history divergence between two cryptic lineages of the alpine mayfly Baetis alpinus in the Swiss Alps...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28098561/decoding-of-intended-saccade-direction-in-an-oculomotor-brain-computer-interface
#7
Nan Jia, Scott Brincat, Andrés Salazar-Gómez, Mikhail Panko, Frank Guenther, Earl Miller
OBJECTIVE: To date, invasive brain-computer interface (BCI) research has largely focused on replacing lost limb functions using signals from of hand/arm areas of motor cortex. However, the oculomotor system may be better suited to BCI applications involving rapid serial selection from spatial targets, such as choosing from a set of possible words displayed on a computer screen in an augmentative and alternative communication (AAC) application. Here we aimed to demonstrate the feasibility of a BCI utilizing the oculomotor system...
January 18, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28098304/real-time-monitoring-of-plasmon-induced-dissociative-electron-transfer-to-the-potential-dna-radiosensitizer-8-bromoadenine
#8
R Schürmann, I Bald
The excitation of localized surface plasmons in noble metal nanoparticles (NPs) results in different nanoscale effects such as electric field enhancement, the generation of hot electrons and a temperature increase close to the NP surface. These effects are typically exploited in diverse fields such as surface-enhanced Raman scattering (SERS), NP catalysis and photothermal therapy (PTT). Halogenated nucleobases are applied as radiosensitizers in conventional radiation cancer therapy due to their high reactivity towards secondary electrons...
January 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28095685/amphiphilic-polymer-guided-plasmonic-assemblies-and-their-biomedical-applications
#9
Jibin Song, Gang Niu, Xiaoyuan Chen
Plasmonic nanostructures with unique physical and biological properties have attracted increased attention for potential biomedical applications. Polymers grafted on metal nanoparticle surface can be used as assembly regulating molecules to guide nanoparticles organize into ordered or hierarchical structures in solution, within condensed phases, or at interfaces. In this Topical Review, we will highlight recent efforts on self-assembly of gold nanoparticles coated with polymer brushes. How and what kind of polymer graft can be used to adjust nanoparticle interactions, to dictate interparticle orientation, and to determine assembled nanostructures will be discussed...
January 18, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28094974/monitoring-dopamine-responses-to-potassium-ion-and-nomifensine-by-in-vivo-microdialysis-with-online-liquid-chromatography-at-one-minute-resolution
#10
Khanh Thieu Ngo, Erika L Varner, Adrian Charles Michael, Stephen G Weber
Recently, our laboratory has demonstrated the technical feasibility of monitoring dopamine at one-min temporal resolution with microdialysis and online liquid chromatography. Here, we monitor dopamine in the rat striatum during local delivery of potassium ion and nomifensine in awake-behaving rats. Microdialysis probes were implanted and dopamine was monitored one or four Days later under basal conditions, during 10-min applications of 60 mM or 100 mM K+, and during 15-min applications of 10 µM nomifensine: K+ and nomifensine were delivered locally by adding them to the microdialysis perfusion fluid...
January 17, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28094262/radiotherapy-and-immunotherapy-a-beneficial-liaison
#11
REVIEW
Ralph R Weichselbaum, Hua Liang, Liufu Deng, Yang-Xin Fu
Investigations into the interaction between radiotherapy and the host immune system have uncovered new mechanisms that can potentially be exploited to improve the efficacy of radiotherapy. Radiation promotes the release of danger signals and chemokines that recruit inflammatory cells into the tumour microenvironment, including antigen-presenting cells that activate cytotoxic T-cell function. By contrast, radiation can attract immunosuppressive cells into the tumour microenvironment. In rare circumstances, the antitumour effect of radiotherapy has been observed outside of the radiation field, known as the abscopal effect...
January 17, 2017: Nature Reviews. Clinical Oncology
https://www.readbyqxmd.com/read/28092427/layer-dependence-and-light-tuning-surface-potential-of-2d-mos2-on-various-substrates
#12
Feng Li, Junjie Qi, Minxuan Xu, Jiankun Xiao, Yuliang Xu, Xiankun Zhang, Shuo Liu, Yue Zhang
Here surface potential of chemical vapor deposition (CVD) grown 2D MoS2 with various layers is reported, and the effect of adherent substrate and light illumination on surface potential of monolayer MoS2 are investigated. The surface potential of MoS2 on Si/SiO2 substrate decreases from 4.93 to 4.84 eV with the increase in the number of layer from 1 to 4 or more. Especially, the surface potentials of monolayer MoS2 are strongly dependent on its adherent substrate, which are determined to be 4.55, 4.88, 4.93, 5...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28091700/computed-tomography-localization-of-the-appendix-in-the-pediatric-population-relative-to-the-lumbar-spine
#13
John Davis, Albert T Roh, Matthew B Petterson, Tammy R Kopelman, Samantha L Matz, Daniel G Gridley, Mary J Connell
BACKGROUND: Computed tomography (CT) is commonly used to evaluate suspected acute appendicitis. Although very effective, CT uses ionizing radiation, exposing patients to an increased risk of cancer. OBJECTIVE: This study assessed the potential for decreasing the field of view of the CT (and therefore the dose to the patient) in the evaluation of suspected acute appendicitis in children. MATERIALS AND METHODS: This study was a retrospective review of prospectively collected data from 212 consecutive patients who underwent CT for suspected acute appendicitis...
January 14, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28090417/pattern-of-local-recurrence-and-distant-metastasis-in-breast-cancer-by-molecular-subtype
#14
Xingrao Wu, Ayesha Baig, Goulnar Kasymjanova, Kamran Kafi, Christina Holcroft, Hind Mekouar, Annie Carbonneau, Boris Bahoric, Khalil Sultanem, Thierry Muanza
BACKGROUND AND PURPOSE:  No longer considered a single disease entity, breast cancer is being classified into several distinct molecular subtypes based on gene expression profiling. These subtypes appear to carry prognostic implications and have the potential to be incorporated into treatment decisions. In this study, we evaluated patterns of local recurrence (LR), distant metastasis (DM), and association of survival with molecular subtype in breast cancer patients in the post-adjuvant radiotherapy setting...
December 9, 2016: Curēus
https://www.readbyqxmd.com/read/28088666/vocal-emotion-decoding-in-the-subthalamic-nucleus-an-intracranial-erp-study-in-parkinson-s-disease
#15
Julie Péron, Olivier Renaud, Claire Haegelen, Lucas Tamarit, Valérie Milesi, Jean-François Houvenaghel, Thibaut Dondaine, Marc Vérin, Paul Sauleau, Didier Grandjean
Using intracranial local field potential (LFP) recordings in patients with Parkinson's disease (PD) undergoing deep brain stimulation (DBS), we explored the electrophysiological activity of the subthalamic nucleus (STN) in response to emotional stimuli in the auditory modality. Previous studies focused on the influence of visual stimuli. To this end, we recorded LFPs within the STN in response to angry, happy, and neutral prosodies in 13 patients with PD who had just undergone implantation of DBS electrodes...
January 12, 2017: Brain and Language
https://www.readbyqxmd.com/read/28087359/the-effect-of-nmda-r-antagonism-on-simultaneously-acquired-local-field-potentials-and-tissue-oxygen-levels-in-the-brains-of-freely-moving-rats
#16
John Kealy, Sean Commins, John P Lowry
Non-competitive NMDA receptor antagonists are known to induce psychosis-like symptoms in rodents. Administration of such compounds cause behavioural effects such as memory impairment and hyperlocomotion. Additionally, drugs such as phencyclidine (PCP), ketamine and MK-801 all cause distinctive increases in striatal local field potential (LFP) in the high frequency oscillation (HFO) band in the power spectrum (140-180 Hz). Amperometric sensors provide a means to measure tissue oxygen (tO2; a BOLD-like signal) in the brains of freely-moving rats while simultaneously acquiring LFP using the same electrode...
January 10, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28081366/an-estimation-of-hybrid-quantum-mechanical-molecular-mechanical-qm-mm-polarization-energies-for-small-molecules-using-polarizable-force-field-approaches
#17
Jing Huang, Ye Mei, Gerhard Koenig, Andrew C Simmonett, Frank C Pickard, Qin Wu, Lee-Ping Wang, Alexander D MacKerell, Bernard R Brooks, Yihan Shao
In this work, we report two polarizable molecular mechanics (polMM) force field models for estimating the polarization energy in hybrid quantum mechanical molecular mechanical (QM/MM) calculations. These two models, named the potential of atomic charges (PAC) and potential of atomic dipoles (PAD), are formulated from the ab initio quantum mechanical (QM) response kernels for the prediction of the QM density response to an external molecular mechanical (MM) environment (as described by external point charges)...
January 12, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28081245/sharp-tailed-grouse-nest-survival-and-nest-predator-habitat-use-in-north-dakota-s-bakken-oil-field
#18
Paul C Burr, Aaron C Robinson, Randy T Larsen, Robert A Newman, Susan N Ellis-Felege
Recent advancements in extraction technologies have resulted in rapid increases of gas and oil development across the United States and specifically in western North Dakota. This expansion of energy development has unknown influences on local wildlife populations and the ecological interactions within and among species. Our objectives for this study were to evaluate nest success and nest predator dynamics of sharp-tailed grouse (Tympanuchus phasianellus) in two study sites that represented areas of high and low energy development intensities in North Dakota...
2017: PloS One
https://www.readbyqxmd.com/read/28079980/induction-of-mesenchymal-stem-cell-differentiation-in-the-absence-of-soluble-inducer-for-cutaneous-wound-regeneration-by-a-chitin-nanofibers-based-hydrogel
#19
Kangquan Shou, Yao Huang, Baiwen Qi, Xiang Hu, Zhanjun Ma, Ang Lu, Chao Jian, Lina Zhang, Aixi Yu
Transplantation of bone marrow mesenchymal stem cells (BMSCs) has been considered as a promising strategy for wound healing. However, poor viability of engrafted BMSCs and limited capabilities of differentiation into the desired cell types in wounds often hinder their application. Few studies report the induction of BMSCs differentiation into the skin regeneration related cell types using natural biopolymer, e.g., chitin and its derivative. Here we utilized a chitin nanofibers(CNFs) hydrogel as a directive cue to induce BMSCs differentiation for enhancing cutaneous wound regeneration in the absence of cell-differentiating factors...
January 12, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28079199/structural-influence-of-proteins-upon-adsorption-to-mos2-nanomaterials-comparison-of-mos2-force-field-parameters
#20
Zonglin Gu, Phil De Luna, Zaixing Yang, Ruhong Zhou
Molybdenum disulfide (MoS2) has recently emerged as a promising nanomaterial in a wide range of applications due to its unique and impressive properties. For example, MoS2 has gained attention in the biomedical field because of its ability to act as an antibacterial and anticancer agent. However, the potential influence of this exciting nanomaterial on biomolecules is yet to be extensively studied. Molecular dynamics (MD) simulations are invaluable tools in the examination of protein interactions with nanomaterials such as MoS2...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
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