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Local field potential

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https://www.readbyqxmd.com/read/28645218/wide-awake-anesthesia-in-the-in-office-procedure-room-lessons-learned
#1
Robert E Van Demark, Hillary A Becker, Matthew C Anderson, Vanessa J S Smith
BACKGROUND: Wide-awake local anesthesia and no tourniquet (WALANT) has become more popular in hand surgery. Without a tourniquet, there is no need for preoperative testing or sedation. The use of lidocaine with epinephrine has allowed a larger variety of cases to be done safely in an outpatient setting instead of the hospital. "Minor field sterility," which uses fewer drapes and tools to accomplish the same procedures, is a concept that is also gaining recognition. METHODS: Investigation of hand surgeons performing a majority of cases using WALANT and minor field sterility was the beginning of seeing its potential at our institution...
June 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28644676/is-a-trineutron-resonance-lower-in-energy-than-a-tetraneutron-resonance
#2
S Gandolfi, H-W Hammer, P Klos, J E Lynn, A Schwenk
We present quantum Monte Carlo calculations of few-neutron systems confined in external potentials based on local chiral interactions at next-to-next-to-leading order in chiral effective field theory. The energy and radial densities for these systems are calculated in different external Woods-Saxon potentials. We assume that their extrapolation to zero external-potential depth provides a quantitative estimate of three- and four-neutron resonances. The validity of this assumption is demonstrated by benchmarking with an exact diagonalization in the two-body case...
June 9, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28642341/use-of-intraoperative-local-field-potential-spectral-analysis-to-differentiate-basal-ganglia-structures-in-parkinson-s-disease-patients
#3
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/28640819/the-importance-of-data-quality-for-generating-reliable-distribution-models-for-rare-elusive-and-cryptic-species
#4
Keith B Aubry, Catherine M Raley, Kevin S McKelvey
The availability of spatially referenced environmental data and species occurrence records in online databases enable practitioners to easily generate species distribution models (SDMs) for a broad array of taxa. Such databases often include occurrence records of unknown reliability, yet little information is available on the influence of data quality on SDMs generated for rare, elusive, and cryptic species that are prone to misidentification in the field. We investigated this question for the fisher (Pekania pennanti), a forest carnivore of conservation concern in the Pacific States that is often confused with the more common Pacific marten (Martes caurina)...
2017: PloS One
https://www.readbyqxmd.com/read/28640508/intraglomerular-gap-junctions-enhance-interglomerular-synchrony-in-a-sparsely-connected-olfactory-bulb-network
#5
Frederic Pouille, Thomas S McTavish, Lawrence E Hunter, Diego Restrepo, Nathan E Schoppa
A dominant feature of the olfactory bulb response to odour is fast synchronized oscillations at beta (15-40 Hz) or gamma (40-90 Hz) frequencies, thought to be involved in integration of olfactory signals. Mechanistically, the bulb presents an interesting case study for understanding how beta/gamma oscillations arise. Fast oscillatory synchrony in the activity of output mitral cells (MCs) appears to result from interactions with GABAergic granule cells (GCs), yet the incidence of MC-GC connections is very low, around 4%...
June 22, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28639871/an-innovative-streaming-video-system-with-a-point-of-view-head-camera-transmission-of-surgeries-to-smartphones-and-tablets-an-educational-utility
#6
Rafael Oliveira Chaves, Pedro Armando Valente de Oliveira, Luciano Chaves Rocha, Joacy Pedro Franco David, Sanmari Costa Ferreira, Alex de Assis Santos Dos Santos, Rômulo Müller Dos Santos Melo, Edson Yuzur Yasojima, Marcus Vinicius Henriques Brito
PURPOSE: In order to engage medical students and residents from public health centers to utilize the telemedicine features of surgery on their own smartphones and tablets as an educational tool, an innovative streaming system was developed with the purpose of streaming live footage from open surgeries to smartphones and tablets, allowing the visualization of the surgical field from the surgeon's perspective. The current study aims to describe the results of an evaluation on level 1 of Kirkpatrick's Model for Evaluation of the streaming system usage during gynecological surgeries, based on the perception of medical students and gynecology residents...
June 1, 2017: Surgical Innovation
https://www.readbyqxmd.com/read/28639263/subthalamic-beta-dynamics-mirror-parkinsonian-bradykinesia-months-after-neurostimulator-implantation
#7
Leon Amadeus Steiner, Wolf-Julian Neumann, Franziska Staub-Bartelt, Damian M Herz, Huiling Tan, Alek Pogosyan, Andrea A Kuhn, Peter Brown
BACKGROUND: Exaggerated oscillatory activity in the beta frequency band in the subthalamic nucleus has been suggested to be related to bradykinesia in Parkinson's disease (PD). However, studies seeking correlations between such activity in the local field potential and motor performance have been limited to the immediate postoperative period, which may be confounded by a stun effect that leads to the temporary alleviation of PD deficits. METHODS: Local field potentials were recorded simultaneously with motor performance in PD patients several months after neurostimulator implantation...
June 22, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28638879/traditional-knowledge-of-medicinal-plants-in-tribes-of-tripura-in-northeast-india
#8
Maria Debbarma, Nazir A Pala, Munesh Kumar, Rainer W Bussmann
BACKGROUND: The present study was carried out in Mandwi area and its outskirts of Tripura district of tribal areas Autonomous district council to document the available ethno-medicinal plants and their traditional application among Mandwi tribes. METHODOLOGY: Field explorations were carried out during the months of March-June 2013. The ethno-medicinal survey was conducted particularly with Tripuri tribe in Mandai area, with the help of local medicine men, locally known as bhoidho (Tripuri)...
2017: African Journal of Traditional, Complementary, and Alternative Medicines: AJTCAM
https://www.readbyqxmd.com/read/28638715/rat-intersubjective-decisions-are-encoded-by-frequency-specific-oscillatory-contexts
#9
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
https://www.readbyqxmd.com/read/28638436/in-vivo-label-free-mapping-of-the-effect-of-a-photosystem-ii-inhibiting-herbicide-in-plants-using-chlorophyll-fluorescence-lifetime
#10
Elizabeth Noble, Sunil Kumar, Frederik G Görlitz, Chris Stain, Chris Dunsby, Paul M W French
BACKGROUND: In order to better understand and improve the mode of action of agrochemicals, it is useful to be able to visualize their uptake and distribution in vivo, non-invasively and, ideally, in the field. Here we explore the potential of plant autofluorescence (specifically chlorophyll fluorescence) to provide a readout of herbicide action across the scales utilising multiphoton-excited fluorescence lifetime imaging, wide-field single-photon excited fluorescence lifetime imaging and single point fluorescence lifetime measurements via a fibre-optic probe...
2017: Plant Methods
https://www.readbyqxmd.com/read/28638364/impact-of-neuronal-membrane-damage-on-the-local-field-potential-in-a-large-scale-simulation-of-cerebral-cortex
#11
David L Boothe, Alfred B Yu, Pawel Kudela, William S Anderson, Jean M Vettel, Piotr J Franaszczuk
Within multiscale brain dynamics, the structure-function relationship between cellular changes at a lower scale and coordinated oscillations at a higher scale is not well understood. This relationship may be particularly relevant for understanding functional impairments after a mild traumatic brain injury (mTBI) when current neuroimaging methods do not reveal morphological changes to the brain common in moderate to severe TBI such as diffuse axonal injury or gray matter lesions. Here, we created a physiology-based model of cerebral cortex using a publicly released modeling framework (GEneral NEural SImulation System) to explore the possibility that performance deficits characteristic of blast-induced mTBI may reflect dysfunctional, local network activity influenced by microscale neuronal damage at the cellular level...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28634378/compact-acceleration-of-energetic-neutral-atoms-using-high-intensity-laser-solid-interaction
#12
Malay Dalui, T Madhu Trivikram, James Colgan, John Pasley, M Krishnamurthy
Recent advances in high-intensity laser-produced plasmas have demonstrated their potential as compact charge particle accelerators. Unlike conventional accelerators, transient quasi-static charge separation acceleration fields in laser produced plasmas are highly localized and orders of magnitude larger. Manipulating these ion accelerators, to convert the fast ions to neutral atoms with little change in momentum, transform these to a bright source of MeV atoms. The emittance of the neutral atom beam would be similar to that expected for an ion beam...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28630880/prominent-lateral-spread-of-imaged-evoked-activity-beyond-cortical-columns-in-barrel-cortex-provides-foundation-for-coding-whisker-identity
#13
Nathan S Jacobs, Ron D Frostig
The posterior medial barrel subfield (PMBSF) of a rat primary somatosensory cortex exquisitely demonstrates topography and columnar organization, defining features of sensory cortices in the mammalian brain. Optical imaging and neuronal recordings in rat PMBSF demonstrate how evoked cortical activity following single whisker stimulation also rapidly spreads laterally into surrounding cortices, disregarding columnar and modality boundaries. The current study quantifies the spatial prominence of such lateral activity spreads by demonstrating that functional connectivity between laterally spaced cortical locations is actually stronger than between vertically spaced cortical locations...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28630662/sex-differences-in-endogenous-cortical-network-activity-spontaneously-recurring-up-down-states
#14
Charalambos Sigalas, Eleni Konsolaki, Irini Skaliora
BACKGROUND: Several molecular and cellular processes in the vertebrate brain exhibit differences between males and females, leading to sexual dimorphism in the formation of neural circuits and brain organization. While studies on large-scale brain networks provide ample evidence for both structural and functional sex differences, smaller-scale local networks have remained largely unexplored. In the current study, we investigate sexual dimorphism in cortical dynamics by means of spontaneous Up/Down states, a type of network activity that is exhibited during slow-wave sleep, quiet wakefulness, and anesthesia and is thought to represent the default activity of the cortex...
2017: Biology of Sex Differences
https://www.readbyqxmd.com/read/28628782/incorporation-of-a-health-economic-modelling-tool-into-public-health-commissioning-evidence-use-in-a-politicised-context
#15
Tom Sanders, Amy Grove, Sarah Salway, Susan Hampshaw, Elizabeth Goyder
This paper explores how commissioners working in an English local government authority (LA) viewed a health economic decision tool for planning services in relation to diabetes. We conducted 15 interviews and 2 focus groups between July 2015 and February 2016, with commissioners (including public health managers, data analysts and council members). Two overlapping themes were identified explaining the obstacles and enablers of using such a tool in commissioning: a) evidence cultures, and b) system interdependency...
June 12, 2017: Social Science & Medicine
https://www.readbyqxmd.com/read/28628614/lamphimerus-a-novel-lamp-assay-for-detecting-amphimerus-sp-dna-in-human-stool-samples
#16
William Cevallos, Pedro Fernández-Soto, Manuel Calvopiña, Cristina Fontecha-Cuenca, Hiromu Sugiyama, Megumi Sato, Julio López Abán, Belén Vicente, Antonio Muro
BACKGROUND: Amphimeriasis is a fish-borne disease caused by the liver fluke Amphimerus spp. that has recently been reported as endemic in the tropical Pacific side of Ecuador with a high prevalence in humans and domestic animals. The diagnosis is based on the stool examination to identify parasite eggs, but it lacks sensitivity. Additionally, the morphology of the eggs may be confounded with other liver and intestinal flukes. No immunological or molecular methods have been developed to date...
June 19, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28628123/electrochemical-strain-microscopy-probes-morphology-induced-variations-in-ion-uptake-and-performance-in-organic-electrochemical%C3%A2-transistors
#17
R Giridharagopal, L Q Flagg, J S Harrison, M E Ziffer, J Onorato, C K Luscombe, D S Ginger
Ionic transport phenomena in organic semiconductor materials underpin emerging technologies ranging from bioelectronics to energy storage. The performance of these systems is affected by an interplay of film morphology, ionic transport and electronic transport that is unique to organic semiconductors yet poorly understood. Using in situ electrochemical strain microscopy (ESM), we demonstrate that we can directly probe local variations in ion transport in polymer devices by measuring subnanometre volumetric expansion due to ion uptake following electrochemical oxidation of the semiconductor...
June 19, 2017: Nature Materials
https://www.readbyqxmd.com/read/28627750/emergent-low-symmetry-phases-and-large-property-enhancements-in-ferroelectric-knbo3-bulk-crystals
#18
Tom T A Lummen, J Leung, Amit Kumar, X Wu, Y Ren, Brian K VanLeeuwen, Ryan C Haislmaier, Martin Holt, Keji Lai, Sergei V Kalinin, Venkatraman Gopalan
The design of new or enhanced functionality in materials is traditionally viewed as requiring the discovery of new chemical compositions through synthesis. Large property enhancements may however also be hidden within already well-known materials, when their structural symmetry is deviated from equilibrium through a small local strain or field. Here, the discovery of enhanced material properties associated with a new metastable phase of monoclinic symmetry within bulk KNbO3 is reported. This phase is found to coexist with the nominal orthorhombic phase at room temperature, and is both induced by and stabilized with local strains generated by a network of ferroelectric domain walls...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28622437/detection-of-halitosis-in-breath-between-the-past-present-and-future
#19
Morad K Nakhleh, Marceau Quatredeniers, Hossam Haick
In order to develop a new generation of diagnostics for halitosis, replacing the subjective organoleptic assessment, a series of exhaled breath analyzers has been developed and assessed. All three devices rely on the assessment of exhaled Volatile Sulfuric Compounds (VSCs), which are mainly generated in and emitted from the oral cavity, contributing to the malodor. Portable, on-site and easy to use, these devices have potential for non-invasive diagnosis of halitosis. However, global assessment of exhaled VSCs alone has two main drawbacks: (1) the absence of VCSs does not rule out halitosis; (2) non-sulfuric volatile compounds that could be biomarkers of systemic diseases, found in up to 15% of halitosis cases, are neglected...
June 16, 2017: Oral Diseases
https://www.readbyqxmd.com/read/28621398/ab-initio-prediction-of-stable-confomeric-polymorphs-of-benzocaine-molecule-a-local-anaesthatic-molecule
#20
Pallipurath Nidhin, David Stephen, Selvaraj Arun Paul
An ab initio methodology to predict the crystal structures of thermodynamically stable polymorphs of benzocaine within the least energy region of energy landscape by analyzing the local minima from the initial gas phase optimization initiated through the flexible torsion using MP2/6-31G(d,p) method. The global search for the hypothetical dense packing for the structures within the energy penalty region of the local minima have revealed the possible stable conformers under a repulsion alone potential field. The generated hypothetical dense packings from the global search were selected for lattice minimization using the repulsion - dispersion potential field to authenticate the stability...
June 2017: Acta Chimica Slovenica
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