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High frequency oscillations

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https://www.readbyqxmd.com/read/28522369/electroencephalographic-monitoring-during-sevoflurane-anaesthesia-in-an-amyotrophic-lateral-sclerosis-patient-with-locked-in-state
#1
Kazuko Hayashi, Ryuhei Araki, Akiko Tanaka
Recently, the cognitive abilities of patients with amyotrophic lateral sclerosis (ALS) have been found to be impaired along with the neurodegeneration of motor neurons. Electroencephalography (EEG) of end-stage ALS patients has reportedly shown specific features based on neuronal network modulations, differing from EEG of other patients with cognitive failure and dementia. However, EEG of end-stage ALS patients during anaesthesia has not yet been reported. A 64-year-old male ALS patient with locked-in state (LIS), supported by tracheostomy positive-pressure ventilation (TPPV) and enteral nourishment for 9years, underwent scheduled general anaesthesia for repair of a fractured mandible...
May 15, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28521267/epileptogenic-high-frequency-oscillations-skip-the-motor-area-in-children-with-multilobar-drug-resistant-epilepsy
#2
Yasushi Iimura, Kevin Jones, Kyoko Hattori, Yushi Okazawa, Atsuko Noda, Kana Hoashi, Yutaka Nonoda, Eishi Asano, Tomoyuki Akiyama, Cristina Go, Ayako Ochi, O Carter Snead, Elizabeth J Donner, James T Rutka, James M Drake, Hiroshi Otsubo
OBJECTIVE: Subtotal hemispherectomy involves the resection of multiple lobes in children with drug-resistant epilepsy, skipping the motor area (MA). We determined epileptogenicity using the occurrence rate (OR) of high-frequency oscillations (HFOs) and the modulation index (MI), demonstrating strength of coupling between HFO and slow wave. We hypothesized that epileptogenicity increased over the multiple lobes but skipped the MA. METHODS: We analyzed 23 children (14 subtotal hemispherectomy; 9 multilobar resections)...
March 24, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28510457/spatiotemporal-evolution-of-coherent-elastic-strain-waves-in-a-single-mos2-flake
#3
Alyssa J McKenna, Jeffrey K Eliason, David J Flannigan
We use bright-field imaging in an ultrafast electron microscope to spatiotemporally map the evolution of photoexcited coherent strain waves in a single, micrometer-size flake of MoS2. Following in situ femtosecond photoexcitation, we observe individual wave trains emerge from discrete nanoscale morphological features and propagate in-plane along specific wave vectors at approximately the speed of sound (7 nm/ps). Over the span of several hundred picoseconds, the 50 GHz wave trains (20 ps periods) are observed to undergo phonon-phonon scattering and wave-train interference, resulting in a transition to larger-scale, incoherent structural dynamics...
May 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/28505605/thickness-and-optical-constants-calculation-for-chalcogenide-alkali-metal-se80te8-nacl-12-thin-film
#4
M I Abd-Elrahman, A A Abu-Sehly, Y M Bakier, M M Hafiz
Chalcogenide-alkali metal semiconducting thin films of four different thicknesses of Se80Te8(NaCl)12 are deposited from bulk by thermal evaporation technique. The crystallinity of the film improves with increasing of thickness as indicated by the recorded X-ray diffraction patterns. The transmission and reflection spectra are measured in the wavelength range of the incident photons from 250 to 2500nm. The thickness and optical constants of the films are calculated based on Swanepeol method using the interference patterns appeared in the transmission spectra...
May 9, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28505495/generalized-boussinesq-scriven-surface-fluid-model-with-curvature-dissipation-for-liquid-surfaces-and-membranes
#5
Oscar F Aguilar Gutierrez, Edtson E Herrera Valencia, Alejandro D Rey
Curvature dissipation is relevant in synthetic and biological processes, from fluctuations in semi-flexible polymer solutions, to buckling of liquid columns, tomembrane cell wall functioning. We present a micromechanical model of curvature dissipation relevant to fluid membranes and liquid surfaces based on a parallel surface parameterization and a stress constitutive equation appropriate for anisotropic fluids and fluid membranes.The derived model, aimed at high curvature and high rate of change of curvature in liquid surfaces and membranes, introduces additional viscous modes not included in the widely used 2D Boussinesq-Scriven rheological constitutive equation for surface fluids...
May 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28494995/high-accuracy-detection-of-airway-obstruction-in-asthma-using-machine-learning-algorithms-and-forced-oscillation-measurements
#6
Jorge L M Amaral, Agnaldo J Lopes, Juliana Veiga, Alvaro C D Faria, Pedro L Melo
BACKGROUND AND OBJECTIVES: The main pathologic feature of asthma is episodic airway obstruction. This is usually detected by spirometry and body plethysmography. These tests, however, require a high degree of collaboration and maximal effort on the part of the patient. There is agreement in the literature that there is a demand of research into new technologies to improve non-invasive testing of lung function. The purpose of this study was to develop automatic classifiers to simplify the clinical use and to increase the accuracy of the forced oscillation technique (FOT) in the diagnosis of airway obstruction in patients with asthma...
June 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28487527/development-of-frequency-based-taste-receptors-using-bioinspired-glucose-nanobiosensor
#7
Amin TermehYousefi, Katsumi Tateno, Samira Bagheri, Hirofumi Tanaka
A method to fabricate a bioinspired nanobiosensor using electronic-based artificial taste receptors for glucose diagnosis is presented. Fabricated bioinspired glucose nanobiosensor designated based on an artificial taste bud including an amperometric glucose biosensor and taste bud-inspired circuits. In fact, the design of the taste bud-inspired circuits was inspired by the signal-processing mechanism of taste nerves which involves two layers. The first, known as a type II cell, detects the glucose by glucose oxidase and transduces the current signal obtained for the pulse pattern is conducted to the second layer, called type III cell, to induce synchronisation of the neural spiking activity...
May 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28482580/luteinizing-hormone-releasing-hormone-targeted-superparamagnetic-gold-nanoshells-for-a-combination-therapy-of-hyperthermia-and-controlled-drug-delivery
#8
Faruq Mohammad, Hamad A Al-Lohedan
In this, we developed superparamagnetic iron oxide nanoparticles (SPIONs) to be appropriate for the diagnosis and treatment of cancer cells by means of magnetic resonance imaging (MRI) and magnetically controlled hyperthermia/drug delivery (respectively). For the preparation of composite, we started with SPIONs, followed by its coating with gold to form SPIONs@Au, which further conjugated with luteinizing hormone-releasing hormone (LHRH) protein by making use of the cysteamine (Cyst) space linker and finally loaded with 5-Fluororacil (5-Fu) anticancer drug to form SPIONs@Au-Cyst-LHRH_5-Fu composite...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28472661/chronic-loss-of-ca2-transmission-leads-to-hippocampal-hyperexcitability
#9
Roman Boehringer, Denis Polygalov, Arthur J Y Huang, Steven J Middleton, Vincent Robert, Marie E Wintzer, Rebecca A Piskorowski, Vivien Chevaleyre, Thomas J McHugh
Hippocampal CA2 pyramidal cells project into both the neighboring CA1 and CA3 subfields, leaving them well positioned to influence network physiology and information processing for memory and space. While recent work has suggested unique roles for CA2, including encoding position during immobility and generating ripple oscillations, an interventional examination of the integrative functions of these connections has yet to be reported. Here we demonstrate that CA2 recruits feedforward inhibition in CA3 and that chronic genetically engineered shutdown of CA2-pyramidal-cell synaptic transmission consequently results in increased excitability of the recurrent CA3 network...
May 3, 2017: Neuron
https://www.readbyqxmd.com/read/28471492/oscillating-devices-for-airway-clearance-in-people-with-cystic-fibrosis
#10
REVIEW
Lisa Morrison, Stephanie Innes
BACKGROUND: Chest physiotherapy is widely prescribed to assist the clearance of airway secretions in people with cystic fibrosis. Oscillating devices generate intra- or extra-thoracic oscillations orally or external to the chest wall. Internally they create variable resistances within the airways, generating controlled oscillating positive pressure which mobilises mucus. Extra-thoracic oscillations are generated by forces outside the respiratory system, e.g. high frequency chest wall oscillation...
May 4, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28463818/high-frequency-somatosensory-stimulation-increases-sensori-motor-inhibition-and-leads-to-perceptual-improvement-in-healthy-subjects
#11
Lorenzo Rocchi, Roberto Erro, Elena Antelmi, Alfredo Berardelli, Michele Tinazzi, Rocco Liguori, Kailash Bhatia, John Rothwell
OBJECTIVE: High frequency repetitive somatosensory stimulation (HF-RSS), which is a patterned electric stimulation applied to the skin through surface electrodes, improves two-point discrimination, somatosensory temporal discrimination threshold (STDT) and motor performance in humans. However, the mechanisms which underlie these changes are still unknown. In particular, we hypothesize that refinement of inhibition might be responsible for the improvement in spatial and temporal perception...
June 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28462067/optimizing-qplus-sensor-assemblies-for-simultaneous-scanning-tunneling-and-noncontact-atomic-force-microscopy-operation-based-on-finite-element-method-analysis
#12
Omur E Dagdeviren, Udo D Schwarz
Quartz tuning forks that have a probe tip attached to the end of one of its prongs while the other prong is arrested to a holder ("qPlus" configuration) have gained considerable popularity in recent years for high-resolution atomic force microscopy imaging. The small size of the tuning forks and the complexity of the sensor architecture, however, often impede predictions on how variations in the execution of the individual assembly steps affect the performance of the completed sensor. Extending an earlier study that provided numerical analysis of qPlus-style setups without tips, this work quantifies the influence of tip attachment on the operational characteristics of the sensor...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28458615/gravitational-waves-and-electrodynamics-new-perspectives
#13
Francisco Cabral, Francisco S N Lobo
Given the recent direct measurement of gravitational waves (GWs) by the LIGO-VIRGO collaboration, the coupling between electromagnetic fields and gravity have a special relevance since it opens new perspectives for future GW detectors and also potentially provides information on the physics of highly energetic GW sources. We explore such couplings using the field equations of electrodynamics on (pseudo) Riemann manifolds and apply it to the background of a GW, seen as a linear perturbation of Minkowski geometry...
2017: European Physical Journal. C, Particles and Fields
https://www.readbyqxmd.com/read/28456264/measurement-of-fluctuations-of-electrostatic-force-acting-between-a-dielectric-plate-and-an-electrostatic-drive
#14
D V Koptsov, L G Prokhorov, V P Mitrofanov
A setup for the measurement of the noise associated with the interaction of an electrostatic field produced by an electrostatic drive with a fused silica plate is presented. The fused silica plate is a part of a 63 Hz high-Q torsional oscillator. Its oscillations are measured by an optical interferometric sensor. The measurements are PC-controlled and fully automated. A digital post-processing scheme is described, allowing the calculation of the plate rotation angle fluctuations and the evolution of the charge distribution on the surface of the fused silica plate...
April 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28454820/dynamic-spatiotemporal-variability-of-alpha-bold-relationships-during-the-resting-state-and-task-evoked-responses
#15
S D Mayhew, A P Bagshaw
Accurate characterization of the spatiotemporal relationship between two of the most prominent neuroimaging measures of neuronal activity, the 8-13Hz, occipito-parietal EEG alpha oscillation and the BOLD fMRI signal, must encompass the intrinsically dynamic nature of both alpha power and brain function. Here, during the eyes-open resting state, we use a 16s sliding-window analysis and demonstrate that the mean spatial network of dynamic alpha-BOLD correlations is highly comparable to the static network calculated over six minutes...
April 25, 2017: NeuroImage
https://www.readbyqxmd.com/read/28451631/gaba-b-agonist-baclofen-normalizes-auditory-evoked-neural-oscillations-and-behavioral-deficits-in-the-fmr1-knockout-mouse-model-of-fragile-x-syndrome
#16
D Sinclair, R Featherstone, M Naschek, J Nam, A Du, S Wright, K Pance, O Melnychenko, R Weger, S Akuzawa, M Matsumoto, S J Siegel
Fragile X syndrome is a genetic condition resulting from FMR1 gene mutation that leads to intellectual disability, autism-like symptoms, and sensory hypersensitivity. Arbaclofen, a GABA-B agonist, has shown efficacy in some individuals with FXS but has become unavailable after unsuccessful clinical trials, prompting interest in publicly available, racemic baclofen. The present study investigated whether racemic baclofen can remediate abnormalities of neural circuit function, sensory processing, and behavior in Fmr1 knockout mice, a rodent model of fragile X syndrome...
January 2017: ENeuro
https://www.readbyqxmd.com/read/28447844/frontal-theta-band-oscillations-predict-error-correction-and-posterror-slowing-in-typing
#17
Çığır Kalfaoğlu, Tom Stafford, Elizabeth Milne
Performance errors are associated with robust behavioral and electroencephalography (EEG) effects. However, there is a debate about the nature of the relationship between these effects and implicit versus explicit error awareness. Our aim was to study the relationship between error related electrophysiological effects, such as spectral perturbations in fronto-medial theta band oscillations (FMT), and error awareness in typing. Typing has an advantage as an experimental paradigm in that detected errors are quickly and habitually signaled by the participant using backspace, allowing separation of detected from undetected errors without interruption in behavior...
April 27, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28443836/energy-harvesting-from-aperiodic-low-frequency-motion-using-reverse-electrowetting
#18
Tsung-Hsing Hsu, J A Taylor, T N Krupenkin
Mechanical energy harvesting can provide a promising alternative to electrochemical batteries, which are currently widely utilized to power mobile electronics. In this work we present a theoretical analysis of a recently proposed method of mechanical energy harvesting, which combines a reverse electrowetting phenomenon with the fast self-oscillating process of bubble growth and collapse. We investigate the details of the bubble dynamics and analyze the dependence of the energy generation process on the system parameters...
April 26, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28442631/p53-dynamics-in-response-to-dna-damage-vary-across-cell-lines-and-are-shaped-by-efficiency-of-dna-repair-and-activity-of-the-kinase-atm
#19
Jacob Stewart-Ornstein, Galit Lahav
Cellular systems show a wide range of signaling dynamics. Many of these dynamics are highly stereotyped, such as oscillations at a fixed frequency. However, most studies looking at the role of signaling dynamics focus on one or a few cell lines, leaving the diversity of dynamics across tissues or cell lines a largely unexplored question. We focused on the dynamics of the tumor suppressor protein p53, which regulates cell cycle arrest and apoptosis in response to DNA damage. We established live-cell reporters for 12 cancer cell lines expressing wild-type p53 and quantified p53 dynamics in response to double-strand break-inducing DNA damage...
April 25, 2017: Science Signaling
https://www.readbyqxmd.com/read/28441393/sequence-learning-modulates-neural-responses-and-oscillatory-coupling-in-human-and-monkey-auditory-cortex
#20
Yukiko Kikuchi, Adam Attaheri, Benjamin Wilson, Ariane E Rhone, Kirill V Nourski, Phillip E Gander, Christopher K Kovach, Hiroto Kawasaki, Timothy D Griffiths, Matthew A Howard, Christopher I Petkov
Learning complex ordering relationships between sensory events in a sequence is fundamental for animal perception and human communication. While it is known that rhythmic sensory events can entrain brain oscillations at different frequencies, how learning and prior experience with sequencing relationships affect neocortical oscillations and neuronal responses is poorly understood. We used an implicit sequence learning paradigm (an "artificial grammar") in which humans and monkeys were exposed to sequences of nonsense words with regularities in the ordering relationships between the words...
April 2017: PLoS Biology
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