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Journal articles on the topic 'Depolarization wave propagation'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Ben-Shimol, Y., N. Blaunstein, and M. Sergeev. "DEPOLARIZATION EFFECTS OF RADIO WAVE PROPAGATION IN VARIOUS LAND BUILT–UP ENVIRONMENTS." Informatsionno-upravliaiushchie sistemy (Information and Control Systems) 74, no. 1 (2015): 68–76. http://dx.doi.org/10.15217/issn1684-8853.2015.1.68.

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2

Momose-Sato, Yoko, Naohisa Miyakawa, Hiraku Mochida, Shinichi Sasaki, and Katsushige Sato. "Optical Analysis of Depolarization Waves in the Embryonic Brain: A Dual Network of Gap Junctions and Chemical Synapses." Journal of Neurophysiology 89, no. 1 (2003): 600–614. http://dx.doi.org/10.1152/jn.00337.2002.

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Correlated neuronal activity plays a fundamental role in the development of the CNS. Using a multiple-site optical recording technique with a voltage-sensitive dye, we previously described a novel type of depolarization wave that was evoked by cranial or spinal nerve stimulation and spread widely over the whole brain region in the chick embryo. We have now investigated developmental expression and neuronal network mechanisms of this depolarization wave by applying direct stimulation to the brain stem or upper cervical cord of E5–E11 embryos, which elicited wave activity similar to that evoked

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3

Santos, Edgar, Renán Sánchez-Porras, Oliver W. Sakowitz, Jens P. Dreier, and Markus A. Dahlem. "Heterogeneous propagation of spreading depolarizations in the lissencephalic and gyrencephalic brain." Journal of Cerebral Blood Flow & Metabolism 37, no. 7 (2017): 2639–43. http://dx.doi.org/10.1177/0271678x16689801.

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In the recently published article, “Heterogeneous incidence and propagation of spreading depolarizations,” it is shown, in vivo and in vitro, how KCl-induced spreading depolarizations in mouse and rat brains can be highly variable, and that they are not limited, as once thought, to a concentric, isotropic, or homogenous depolarization wave in space or in time. The reported results serve as a link between the different species, and this paper contributes to changing the way in which SD expansion is viewed in the lissencephalic brain. Here, we discuss their results with our previous observations

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Bayguinov, Orline, Sean M. Ward, James L. Kenyon, and Kenton M. Sanders. "Voltage-gated Ca2+ currents are necessary for slow-wave propagation in the canine gastric antrum." American Journal of Physiology-Cell Physiology 293, no. 5 (2007): C1645—C1659. http://dx.doi.org/10.1152/ajpcell.00165.2007.

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Electrical slow waves determine the timing and force of peristaltic contractions in the stomach. Slow waves originate from a dominant pacemaker in the orad corpus and propagate actively around and down the stomach to the pylorus. The mechanism of slow-wave propagation is controversial. We tested whether Ca2+ entry via a voltage-dependent, dihydropyridine-resistant Ca2+ conductance is necessary for active propagation in canine gastric antral muscles. Muscle strips cut parallel to the circular muscle were studied with intracellular electrophysiological techniques using a partitioned-chamber appa

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Smith, T. K., J. B. Reed, and K. M. Sanders. "Effects of membrane potential on electrical slow waves of canine proximal colon." American Journal of Physiology-Cell Physiology 255, no. 6 (1988): C828—C834. http://dx.doi.org/10.1152/ajpcell.1988.255.6.c828.

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The effects of membrane potential on the waveforms and propagation of slow waves were tested using circular muscles of the canine colon. Studies were conducted with intracellular recording techniques on cross-sectional strips of canine proximal colon. Circular muscle cells near the submucosa generated slow waves that decayed in amplitude as they spread through the circular layer. The membrane potentials of cells were less negative as a function of distance from the submucosal border. Cells near the submucosa were depolarized with elevated external K+ and electrical pulses using the partitioned

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Tryba, Andrew K., Edward M. Merricks, Somin Lee, et al. "Role of paroxysmal depolarization in focal seizure activity." Journal of Neurophysiology 122, no. 5 (2019): 1861–73. http://dx.doi.org/10.1152/jn.00392.2019.

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We analyze the role of inhibition in sustaining focal epileptic seizure activity. We review ongoing seizure activity at the mesoscopic scale that can be observed with microelectrode arrays as well as at the macroscale of standard clinical EEG. We provide clinical, experimental, and modeling data to support the hypothesis that paroxysmal depolarization (PD) is a critical component of the ictal machinery. We present dual-patch recordings in cortical cultures showing reduced synaptic transmission associated with presynaptic occurrence of PD, and we find that the PD threshold is cell size related.

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Seppey, Dominique, Roger Sauser, Michèle Koenigsberger, Jean-Louis Bény, and Jean-Jacques Meister. "Intercellular calcium waves are associated with the propagation of vasomotion along arterial strips." American Journal of Physiology-Heart and Circulatory Physiology 298, no. 2 (2010): H488—H496. http://dx.doi.org/10.1152/ajpheart.00281.2009.

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Vasomotion consists of cyclic arterial diameter variations induced by synchronous contractions and relaxations of smooth muscle cells. However, the arteries do not contract simultaneously on macroscopic distances, and a propagation of the contraction can be observed. In the present study, our aim was to investigate this propagation. We stimulated endothelium-denuded rat mesenteric arterial strips with phenylephrine (PE) to obtain vasomotion and observed that the contraction waves are linked to intercellular calcium waves. A velocity of ∼100 μm/s was measured for the two kinds of waves. To inve

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Blackwell, K. T. "Calcium Waves and Closure of Potassium Channels in Response to GABA Stimulation in Hermissenda Type B Photoreceptors." Journal of Neurophysiology 87, no. 2 (2002): 776–92. http://dx.doi.org/10.1152/jn.00867.2000.

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Classical conditioning of Hermissenda crassicornisrequires the paired presentation of a conditioned stimulus (light) and an unconditioned stimulus (turbulence). Light stimulation of photoreceptors leads to production of diacylglycerol, an activator of protein kinase C, and inositol triphosphate (IP3), which releases calcium from intracellular stores. Turbulence causes hair cells to release GABA onto the terminal branches of the type B photoreceptor. One prior study has shown that GABA stimulation produces a wave of calcium that propagates from the terminal branches to the soma and raises the p

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9

Senseman, David M., and Kay A. Robbins. "High-Speed VSD Imaging of Visually Evoked Cortical Waves: Decomposition Into Intra- and Intercortical Wave Motions." Journal of Neurophysiology 87, no. 3 (2002): 1499–514. http://dx.doi.org/10.1152/jn.00475.2001.

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In the pond turtle, Pseudemys scripta elegans, visually evoked cortical waves propagate at different velocities within the primary visual area compared with waves that pass into the secondary visual area. In an effort to separate intra- and intercortical wave motions, movies of visually evoked cortical waves recorded by high-speed voltage-sensitive dye (VSD) imaging were subjected to Karhunen-Loéve (KL) decomposition. This procedure decomposes the VSD movies into a series of basis images that capture different spatial patterns of coherent activity. Most of the energy of the compound wave motio

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Aiba, Isamu, Andrew P. Carlson, Christian T. Sheline, and C. William Shuttleworth. "Synaptic release and extracellular actions of Zn2+ limit propagation of spreading depression and related events in vitro and in vivo." Journal of Neurophysiology 107, no. 3 (2012): 1032–41. http://dx.doi.org/10.1152/jn.00453.2011.

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Cortical spreading depression (CSD) is a consequence of a slowly propagating wave of neuronal and glial depolarization (spreading depolarization; SD). Massive release of glutamate contributes to SD propagation, and it was recently shown that Zn2+ is also released from synaptic vesicles during SD. The present study examined consequences of extracellular Zn2+ accumulation on the propagation of SD. SD mechanisms were studied first in murine brain slices, using focal KCl applications as stimuli and making electrical and optical recordings in hippocampal area CA1. Elevating extracellular Zn2+ conce

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11

Momose-Sato, Yoko, Yoshiko Honda, Hiroshi Sasaki, and Katsushige Sato. "Optical Imaging of Large-Scale Correlated Wave Activity in the Developing Rat CNS." Journal of Neurophysiology 94, no. 2 (2005): 1606–22. http://dx.doi.org/10.1152/jn.00044.2005.

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Correlated neuronal activity plays a fundamental role in the development of the nervous system. Using a multiple-site optical recording technique with a fast voltage-sensitive dye, we previously reported a novel form of correlated activity in the chick embryo, which showed wide propagation throughout the CNS. In this study, we report that similar wave activity is generated in the embryonic rat CNS. Electrical stimulation applied to the cervical cord evoked wave activity that traveled over a wide region of the CNS including the medulla, pons, midbrain, diencephalon, and spinal cord. Small signa

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12

Hoffmann, Ulrike, Inna Sukhotinsky, Katharina Eikermann-Haerter, and Cenk Ayata. "Glucose Modulation of Spreading Depression Susceptibility." Journal of Cerebral Blood Flow & Metabolism 33, no. 2 (2012): 191–95. http://dx.doi.org/10.1038/jcbfm.2012.132.

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Spreading depression of Leão is an intense spreading depolarization (SD) wave associated with massive transmembrane ionic, water, and neurotransmitter shifts. Spreading depolarization underlies migraine aura, and occurs in brain injury, making it a potential therapeutic target. While susceptibility to SD can be modulated pharmacologically, much less is known about modulation by systemic physiological factors, such as the glycemic state. In this study, we systematically examined modulation of SD susceptibility by blood glucose in anesthetized rats under full physiological monitoring. Hyperglyce

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13

Barclay, Bryce M., Eric J. Kostelich, and Alex Mahalov. "Vectorial EM Propagation Governed by the 3D Stochastic Maxwell Vector Wave Equation in Stratified Layers." Atmosphere 14, no. 9 (2023): 1451. http://dx.doi.org/10.3390/atmos14091451.

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The modeling and processing of vectorial electromagnetic (EM) waves in inhomogeneous media are important problems in physics and engineering, and new methods need to be developed to incorporate novel vector sensor technology. Vectorial phenomena of EM waves in stratified atmospheric layers can be incorporated into governing equations by retaining the gradient of the refractive index when deriving the Maxwell Vector Wave Equation (MVWE) from Maxwell’s equations. The MVWE, as opposed to the scalar wave, Helmholtz, and paraxial equations, couples the EM field components in inhomogeneous media and

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14

Kwaku, Kevin F., and Stephen M. Dillon. "Shock-Induced Depolarization of Refractory Myocardium Prevents Wave-Front Propagation in Defibrillation." Circulation Research 79, no. 5 (1996): 957–73. http://dx.doi.org/10.1161/01.res.79.5.957.

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15

Jiang, Dong Dong, Jin Mei Du, Yan Gu, and Yu Jun Feng. "Electrical Behavior of PSZT Ferroelectric Ceramic under Shock Wave Compression." Key Engineering Materials 368-372 (February 2008): 21–23. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.21.

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Electric power of hundreds of kilowatts can be produced in a few microseconds by sudden release of bound charge on the surface of ferroelectric ceramic through shock wave compression. In order to understand the depolarization process, knowledge of the discharge behavior of ferroelectric ceramic under shock wave compression is essential. Gas-gun facility has been used to investigate the shock-induced depolarization kinetics of tin-modified lead zirconate titanate ferroelectric ceramic. Experiments were conducted in the normal mode in which the shock propagation vector was perpendicular to the r

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16

Smirnova, S. L., O. V. Suslonova, and I. M. Roshchevskaya. "Non-invasive detection of arrhythmogenic foci of atria by using the cardioelectric field on the surface of the body during experimental pulmonary hypertension." Jounal of arrhythmology 27, no. 1 (2020): 63–69. http://dx.doi.org/10.35336/va-2020-1-63-69.

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Aim. The potential distribution of the cardioelectric field on the body surface during the initial atrial activity and the sequence of depolarization of the atrial subepicardium in rats with experimentally induced pulmonary hypertension were compared. This work is devoted to non-invasive detection of arrhythmogenic foci of atria by using the cardioelectric field on the body surface during experimental pulmonary hypertension.Materials and methods. The method of cardioelectrochronotopography has been used to study the electric field of the heart on the body surface and the sequence of propagatio

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17

Jasiūnienė, Elena, Egidijus Žukauskas, and Rymantas Kažys. "Numerical Investigation of Propagation of Ultrasonic Waves in the Waveguides with Mode Conversion." Key Engineering Materials 543 (March 2013): 219–22. http://dx.doi.org/10.4028/www.scientific.net/kem.543.219.

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Ultrasonic investigation techniques are widely used in materials characterisation and non-destructive testing applications. In special cases of applications, such as investigation of properties of melted polymers, metals and hot liquids, measurements must be performed in a wide temperature range. However conventional piezoelectric transducers cannot withstand higher temperatures than the Curie temperature. Therefore in order to protect conventional ultrasonic transducers from influence of a high temperature and to avoid depolarization, measurements must be performed using special waveguides wi

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18

Lopez, J. R., R. A. Ghanbari, and A. Terzic. "A KATP channel opener protects cardiomyocytes from Ca2+ waves: a laser confocal microscopy study." American Journal of Physiology-Heart and Circulatory Physiology 270, no. 4 (1996): H1384—H1389. http://dx.doi.org/10.1152/ajpheart.1996.270.4.h1384.

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Laser confocal microscopy was used to visualize intracellular spatiotemporal Ca2+ patterns in single guinea pig ventricular myocytes loaded with the Ca2+ indicator, fluo 3-acetoxymethyl ester (fluo 3-AM), and exposed to moderately elevated extracellular K+ to induce partial membrane depolarization. Analysis of K(+)-induced intracellular Ca2+ elevation revealed three distinct paradigms: 1) diffuse, nonoscillatory Ca2+ elevation across the myocyte; 2) localized Ca2+ elevation in anatomically restricted areas (Ca2+ sparks); and 3) regenerative frontal propagations of Ca2+ that traversed the lengt

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19

Boitier, Eric, Ruth Rea, and Michael R. Duchen. "Mitochondria Exert a Negative Feedback on the Propagation of Intracellular Ca2+ Waves in Rat Cortical Astrocytes." Journal of Cell Biology 145, no. 4 (1999): 795–808. http://dx.doi.org/10.1083/jcb.145.4.795.

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We have used digital fluorescence imaging techniques to explore the interplay between mitochondrial Ca2+ uptake and physiological Ca2+ signaling in rat cortical astrocytes. A rise in cytosolic Ca2+ ([Ca2+]cyt), resulting from mobilization of ER Ca2+ stores was followed by a rise in mitochondrial Ca2+ ([Ca2+]m, monitored using rhod-2). Whereas [Ca2+]cyt recovered within ∼1 min, the time to recovery for [Ca2+]m was ∼30 min. Dissipating the mitochondrial membrane potential (Δψm, using the mitochondrial uncoupler carbonyl cyanide p-trifluoromethoxy-phenyl-hydrazone [FCCP] with oligomycin) prevente

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20

Csurgai-Horváth, László, Bernard Adjei-Frimpong, Carlo Riva, and Lorenzo Luini. "Radio Wave Satellite Propagation in Ka/Q Band." Periodica Polytechnica Electrical Engineering and Computer Science 62, no. 2 (2018): 38–46. http://dx.doi.org/10.3311/ppee.11065.

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In 2013 the European Space Agency, in cooperation with Inmarsat, launched the Alphasat communication satellite hosting four Technology Demonstration Payloads (TDPs). One of them is the Aldo Paraboni payload, supported by the Italian Space Agency (ASI) and executed by ESA in the framework of the Advanced Research in Telecommunications Systems (ARTES) 8 Telecom program. In addition to the Communication experiment, it includes the Alphasat Scientific Experiment transmitting coherent beacon signals at Ka-band (19.701 GHz) and Q-band (39.402 GHz). The satellite supports a Europe-wide experiment to

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Binder, Nadine Felizitas, Chaim Glück, William Middleham, et al. "Vascular Response to Spreading Depolarization Predicts Stroke Outcome." Stroke 53, no. 4 (2022): 1386–95. http://dx.doi.org/10.1161/strokeaha.121.038085.

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Background: Cortical spreading depolarization (CSD) is a massive neuro-glial depolarization wave, which propagates across the cerebral cortex. In stroke, CSD is a necessary and ubiquitous mechanism for the development of neuronal lesions that initiates in the ischemic core and propagates through the penumbra extending the tissue injury. Although CSD propagation induces dramatic changes in cerebral blood flow, the vascular responses in different ischemic regions and their consequences on reperfusion and recovery remain to be defined. Methods: Ischemia was performed using the thrombin model of s

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Kusters, J. M. A. M., W. P. M. van Meerwijk, D. L. Ypey, A. P. R. Theuvenet, and C. C. A. M. Gielen. "Fast calcium wave propagation mediated by electrically conducted excitation and boosted by CICR." American Journal of Physiology-Cell Physiology 294, no. 4 (2008): C917—C930. http://dx.doi.org/10.1152/ajpcell.00181.2007.

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We have investigated synchronization and propagation of calcium oscillations, mediated by gap junctional excitation transmission. For that purpose we used an experimentally based model of normal rat kidney (NRK) cells, electrically coupled in a one-dimensional configuration (linear strand). Fibroblasts such as NRK cells can form an excitable syncytium and generate spontaneous inositol 1,4,5-trisphosphate (IP3)-mediated intracellular calcium waves, which may spread over a monolayer culture in a coordinated fashion. An intracellular calcium oscillation in a pacemaker cell causes a membrane depol

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Williams, D. A., L. M. Delbridge, S. H. Cody, P. J. Harris, and T. O. Morgan. "Spontaneous and propagated calcium release in isolated cardiac myocytes viewed by confocal microscopy." American Journal of Physiology-Cell Physiology 262, no. 3 (1992): C731—C742. http://dx.doi.org/10.1152/ajpcell.1992.262.3.c731.

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Laser scanning confocal microscopy of the Ca(2+)-sensitive fluorophore fluo-3 has been used to investigate spontaneous and propagated calcium release at high temporal and spatial resolution in enzymatically dispersed rat cardiomyocytes. Waves of fluorescence which propagated throughout the cytosol were evident in spontaneously contracting cardiac cells containing fluo-3, but not in cells containing Ca(2+)-insensitive fluorophores [2',7'-bis (carboxyethyl)-5,6-carboxyfluorescein, SNARF-1, rhodamine-123, or tetramethylrhodamine-labeled dextran]. These waves represent localized areas of elevated

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Zhou, Ning, Ravi L. Rungta, Aqsa Malik, Huili Han, Dong Chuan Wu, and Brian A. MacVicar. "Regenerative Glutamate Release by Presynaptic NMDA Receptors Contributes to Spreading Depression." Journal of Cerebral Blood Flow & Metabolism 33, no. 10 (2013): 1582–94. http://dx.doi.org/10.1038/jcbfm.2013.113.

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Spreading depression (SD) is a slowly propagating neuronal depolarization that underlies certain neurologic conditions. The wave-like pattern of its propagation suggests that SD arises from an unusual form of neuronal communication. We used enzyme-based glutamate electrodes to show that during SD induced by transiently raising extracellular K+ concentrations ([K+]o) in rat brain slices, there was a rapid increase in the extracellular glutamate concentration that required vesicular exocytosis but unlike fast synaptic transmission, still occurred when voltage-gated sodium and calcium channels (V

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Yudina, Lyubov, Alyona Popova, Yuriy Zolin, Ekaterina Sukhova, and Vladimir Sukhov. "Local Action of Increased Pressure Induces Hyperpolarization Electrical Signals and Influences Photosynthetic Light Reactions in Wheat Plants." Plants 12, no. 13 (2023): 2570. http://dx.doi.org/10.3390/plants12132570.

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Long-distance electrical signals caused by the local action of stressors influence numerous physiological processes in plants including photosynthesis and increase their tolerance to the action of adverse factors. Depolarization electrical signals were mainly investigated; however, we earlier showed that hyperpolarization electrical signals (HESs) can be caused by moderate stressors (e.g., local moderate heating) and induce photosynthetic inactivation. We hypothesized that HESs are related to stressor-induced increases in the hydrostatic pressure in the zone of action of the stressor and follo

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Joshi, I., and R. D. Andrew. "Imaging Anoxic Depolarization During Ischemia-Like Conditions in the Mouse Hemi-Brain Slice." Journal of Neurophysiology 85, no. 1 (2001): 414–24. http://dx.doi.org/10.1152/jn.2001.85.1.414.

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Focal ischemia evokes a sudden loss of membrane potential in neurons and glia of the ischemic core termed the anoxic depolarization (AD). In metabolically compromised regions with partial blood flow, peri-infarct depolarizations (PIDs) further drain energy reserves, promoting acute and delayed neuronal damage. Visualizing and quantifying the AD and PIDs and their acute deleterious effects are difficult in the intact animal. In the present study, we imaged intrinsic optical signals to measure changes in light transmittance in the mouse coronal hemi-brain slice during AD generation. The AD was i

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27

Lin, Joyce W., Libet Garber, Yue Rosa Qi, Marvin G. Chang, Joshua Cysyk, and Leslie Tung. "Region of slowed conduction acts as core for spiral wave reentry in cardiac cell monolayers." American Journal of Physiology-Heart and Circulatory Physiology 294, no. 1 (2008): H58—H65. http://dx.doi.org/10.1152/ajpheart.00631.2007.

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Pathophysiological heterogeneity in cardiac tissue is related to the occurrence of arrhythmias. Of importance are regions of slowed conduction, which have been implicated in the formation of conduction block and reentry. Experimentally, it has been a challenge to produce local heterogeneity in a manner that is both reversible and well controlled. Consequently, we developed a dual-zone superfusion chamber that can dynamically create a small (5 mm) central island of heterogeneity in cultured cardiac cell monolayers. Three different conditions were studied to explore the effect of regionally slow

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Smirnova, Mariia P., Tatiana M. Medvedeva, Irina V. Pavlova, and Lyudmila V. Vinogradova. "Region-Specific Vulnerability of the Amygdala to Injury-Induced Spreading Depolarization." Biomedicines 10, no. 9 (2022): 2183. http://dx.doi.org/10.3390/biomedicines10092183.

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Spreading depolarization (SD), a self-propagated wave of transient depolarization, regularly occurs in the cortex after acute brain insults and is now referred as an important diagnostic and therapeutic target in patients with acute brain injury. Here, we show that the amygdala, the limbic structure responsible for post-injury neuropsychological symptoms, exhibits strong regional heterogeneity in vulnerability to SD with high susceptibility of its basolateral (BLA) region and resilience of its centromedial (CMA) region to triggering SD by acute focal damage. The BLA micro-injury elicited SD tw

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Baspinar, Emre, Martina Simonti, Hadi Srour, Mathieu Desroches, Daniele Avitabile, and Massimo Mantegazza. "GABAergic neurons can facilitate the propagation of cortical spreading depolarization: experiments in mouse neocortical slices and a novel neural field computational model." PLOS Computational Biology 21, no. 6 (2025): e1013099. https://doi.org/10.1371/journal.pcbi.1013099.

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Cortical spreading depolarization (CSD) is a wave of depolarization with local onset and extended propagation implicated in several pathological conditions. Its mechanisms have been extensively investigated, including our recent studies showing with experimental and computational approaches that the hyperactivity of GABAergic neurons’ can initiate migraine-related CSD because of spiking-generated extracellular potassium (K+) build-up. However, less is known about the role played by GABAergic neurons in CSD propagation. Here we studied mechanisms of CSD propagation, focusing on the role of GABA

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Ma, Q., and A. Ishimaru. "Propagation and depolarization of an arbitrarily polarized wave obliquely incident on a slab of random medium." IEEE Transactions on Antennas and Propagation 39, no. 11 (1991): 1626–32. http://dx.doi.org/10.1109/8.102778.

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Xu, Weifeng, Brian S. Wolff, and Jian-young Wu. "Low-intensity electric fields induce two distinct response components in neocortical neuronal populations." Journal of Neurophysiology 112, no. 10 (2014): 2446–56. http://dx.doi.org/10.1152/jn.00740.2013.

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Low-intensity alternating electric fields applied to the scalp are capable of modulating cortical activity and brain functions, but the underlying mechanisms remain largely unknown. Here, we report two distinct components of voltage-sensitive dye signals induced by low-intensity, alternating electric fields in rodent cortical slices: a “passive component,” which corresponds to membrane potential changes directly induced by the electric field; and an “active component,” which is a widespread depolarization that is dependent on excitatory synaptic transmission. The passive component is stationar

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Aitken, P. G., G. C. Tombaugh, D. A. Turner, and G. G. Somjen. "Similar Propagation of SD and Hypoxic SD-Like Depolarization in Rat Hippocampus Recorded Optically and Electrically." Journal of Neurophysiology 80, no. 3 (1998): 1514–21. http://dx.doi.org/10.1152/jn.1998.80.3.1514.

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Aitken, P. G., G. C. Tombaugh, D. A. Turner, and G. G. Somjen. Similar propagation of SD and hypoxic SD-like depolarization in rat hippocampus recorded optically and electrically. J. Neurophysiol. 80: 1514–1521, 1998. Neuron membrane changes and ion redistribution during normoxic spreading depression (SD) induced, for example, by potassium injection, closely resemble those that occur during hypoxic SD-like depolarization (HSD) induced by oxygen withdrawal, but the degree to which the two phenomena are related is controversial. We used extracellular electrical recording and imaging of intrinsic

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Terasaka, D., A. Bortoff, and L. F. Sillin. "Postprandial changes in intestinal slow-wave propagation reflect a decrease in cell coupling." American Journal of Physiology-Gastrointestinal and Liver Physiology 257, no. 3 (1989): G463—G469. http://dx.doi.org/10.1152/ajpgi.1989.257.3.g463.

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The purpose of these studies was to determine the effects of feeding on jejunal slow-wave propagation velocity (SWPV). Nine cats were instrumented with six pairs of electrodes implanted 4 cm apart on the jejunum. Electrical activity was recorded at the end of an 18-h fast after which each animal was fed 60 g of canned cat food. Recordings were continued during feeding and for several hours thereafter. This procedure was repeated at least twice for each cat. Average SWPV (cm/s) decreased from a fasting level of 2.28 +/- 0.20 (mean of means +/- SE) to 1.93 +/- 0.16 at 10-20 min, 1.51 +/- 0.11 at

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Bardakjian, B. L., and E. J. Vigmond. "Effects of the propagation velocity of a surface depolarization wave on the extracellular potential of an excitable cell." IEEE Transactions on Biomedical Engineering 41, no. 5 (1994): 432–39. http://dx.doi.org/10.1109/10.293217.

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35

Amzica, Florin, and Dag Neckelmann. "Membrane Capacitance of Cortical Neurons and Glia During Sleep Oscillations and Spike-Wave Seizures." Journal of Neurophysiology 82, no. 5 (1999): 2731–46. http://dx.doi.org/10.1152/jn.1999.82.5.2731.

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Dual intracellular recordings in vivo were used to disclose relationships between cortical neurons and glia during spontaneous slow (<1 Hz) sleep oscillations and spike-wave (SW) seizures in cat. Glial cells displayed a slow membrane potential oscillation (<1 Hz), in close synchrony with cortical neurons. In glia, each cycle of this oscillation was made of a round depolarizing potential of 1.5–3 mV. The depolarizing slope corresponded to a steady depolarization and sustained synaptic activity in neurons (duration, 0.5–0.8 s). The repolarization of the glial membrane (duration, 0.5–0.8 s)

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Bringi and Zrnic. "Polarization Weather Radar Development from 1970–1995: Personal Reflections." Atmosphere 10, no. 11 (2019): 714. http://dx.doi.org/10.3390/atmos10110714.

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The modern era of polarimetric radar begins with radiowave propagation research starting in the early 1970s with applications to measurement and modeling of wave attenuation in rain and depolarization due to ice particles along satellite–earth links. While there is a rich history of radar in meteorology after World War II, the impetus provided by radiowave propagation requirements led to high-quality antennas and feeds. Our journey starts by describing the key institutions and personnel responsible for development of weather radar polarimetry. The early period was dominated by circularly polar

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Zheng, Haifeng, Kyung Sik Park, Sang Don Koh, and Kenton M. Sanders. "Expression and function of a T-type Ca2+ conductance in interstitial cells of Cajal of the murine small intestine." American Journal of Physiology-Cell Physiology 306, no. 7 (2014): C705—C713. http://dx.doi.org/10.1152/ajpcell.00390.2013.

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Interstitial cells of Cajal (ICC) generate slow waves in gastrointestinal (GI) muscles. Previous studies have suggested that slow wave generation and propagation depends on a voltage-dependent Ca2+ entry mechanism with the signature of a T-type Ca2+ conductance. We studied voltage-dependent inward currents in isolated ICC. ICC displayed two phases of inward current upon depolarization: a low voltage-activated inward current and a high voltage-activated current. The latter was of smaller current density and blocked by nicardipine. Ni2+ (30 μM) or mibefradil (1 μM) blocked the low voltage-activa

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Toda, S., S. Kawahara, and Y. Kirino. "Image analysis of olfactory responses in the procerebrum of the terrestrial slug Limax marginatus." Journal of Experimental Biology 203, no. 19 (2000): 2895–905. http://dx.doi.org/10.1242/jeb.203.19.2895.

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Neural oscillations have been found to occur in the olfactory centers of some vertebrates and invertebrates, including the procerebrum of the terrestrial slug Limax marginatus. Using optical recording with the potential-sensitive dye di-4-ANEPPS, we analyzed the spatiotemporal pattern of procerebral neural activities in response to odorants applied to an in vitro brain-superior tentacle preparation. The odor of rat chow, on which the slugs were normally fed, increased the frequency of the oscillation. Garlic odor, which induced aversive behavior in the slug, caused a transient increase in osci

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Alvarez, J. M., M. A. Vaughan, C. A. Hostetler, W. H. Hunt, and D. M. Winker. "Calibration Technique for Polarization-Sensitive Lidars." Journal of Atmospheric and Oceanic Technology 23, no. 5 (2006): 683–99. http://dx.doi.org/10.1175/jtech1872.1.

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Abstract Polarization-sensitive lidars have proven to be highly effective in discriminating between spherical and nonspherical particles in the atmosphere. These lidars use a linearly polarized laser and are equipped with a receiver that can separately measure the components of the return signal polarized parallel and perpendicular to the outgoing beam. In this work a technique for calibrating polarization-sensitive lidars is described that was originally developed at NASA's Langley Research Center (LaRC) and has been used continually over the past 15 yr. The procedure uses a rotatable half-wa

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Woo, Sun-Hee, Seon-Hwa Hwang, Joon-Chul Kim, and Martin Morad. "Enhancement of Ca2+Current Does Not Regulate the Speed of Depolarization-induced Ca2+Propagation Wave in Rat Atrial Myocytes." Biomolecules and Therapeutics 15, no. 4 (2007): 212–17. http://dx.doi.org/10.4062/biomolther.2007.15.4.212.

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XU, TINGTING, PENGCHENG LI, SHANGBIN CHEN, and WEIHUA LUO. "TWO-DIMENSIONAL VISUALIZATION OF THE PROPAGATION SPEED OF CORTICAL SPREADING DEPRESSION IN RAT CORTEX." Journal of Innovative Optical Health Sciences 03, no. 01 (2010): 75–80. http://dx.doi.org/10.1142/s1793545810000873.

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Cortical spreading depression (CSD), which is a significant pathological phenomenon that correlates with migraines and cerebral ischemia, has been characterized by a wave of depolarization among neuronal cells and propagates across the cortex at a rate of 2–5 mm/min. Although the propagation pattern of CSD was well-investigated using high-resolution optical imaging technique, the variation of propagation speed of CSD across different regions of cortex was not well-concerned, partially because of the lack of ideal approach to visualize two-dimensional distribution of propagation speed of CSD ov

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Fujita, Shuji, Hideo Maeno, and Kenichi Matsuoka. "Radio-wave depolarization and scattering within ice sheets: a matrix-based model to link radar and ice-core measurements and its application." Journal of Glaciology 52, no. 178 (2006): 407–24. http://dx.doi.org/10.3189/172756506781828548.

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AbstractCrystal-orientation fabric (COF) has a large influence on ice-sheet flow. Earlier radar studies have shown that COF-based birefringence occurs within ice sheets. Radio-wave scattering in polar ice results from changing physical properties of permittivity and conductivity that arise from differing values of density, acidity and COF. We present an improved mathematical model that can handle all these phenomena together. We use this matrix-based model to study the two-way propagation of depolarized radio waves that scatter at both isotropic and anisotropic boundaries. Based on numerical s

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SUN, XIAOLI, PENGCHENG LI, WEIHUA LUO, BIYING GONG, and QINGMING LUO. "ACCURATELY DETERMINING PROPAGATION VELOCITY OF CORTICAL SPREADING DEPRESSION IN RATS BY OPTICAL INTRINSIC SIGNAL IMAGING." Journal of Innovative Optical Health Sciences 03, no. 02 (2010): 103–8. http://dx.doi.org/10.1142/s1793545810000915.

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Cortical spreading depression (CSD) is a wave of neuronal and glial depolarization that propagates across the cortex at a rate of 2–5 mm/min accompanied by reversible electroencephalogram (EEG) suppression, a negative shift of direct current (DC) potential, and change of optical intrinsic signals (OIS). Propagation velocity of CSD is an important parameter used to study this phenomenon. It is commonly determined in an electrophysiological way that measures the time required for a CSD wave to pass along two electrodes. Since the electrophysiology technique fails to reveal the spreading pattern

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Djemai, Mohammed, Michael Cupelli, Mohamed Boutjdir, and Mohamed Chahine. "Optical Mapping of Cardiomyocytes in Monolayer Derived from Induced Pluripotent Stem Cells." Cells 12, no. 17 (2023): 2168. http://dx.doi.org/10.3390/cells12172168.

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Optical mapping is a powerful imaging technique widely adopted to measure membrane potential changes and intracellular Ca2+ variations in excitable tissues using voltage-sensitive dyes and Ca2+ indicators, respectively. This powerful tool has rapidly become indispensable in the field of cardiac electrophysiology for studying depolarization wave propagation, estimating the conduction velocity of electrical impulses, and measuring Ca2+ dynamics in cardiac cells and tissues. In addition, mapping these electrophysiological parameters is important for understanding cardiac arrhythmia mechanisms. In

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Nagel, Claudia, Nicolas Pilia, Laura Unger, and Olaf Dössel. "Performance of Different Atrial Conduction Velocity Estimation Algorithms Improves with Knowledge about the Depolarization Pattern." Current Directions in Biomedical Engineering 5, no. 1 (2019): 101–4. http://dx.doi.org/10.1515/cdbme-2019-0026.

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AbstractQuantifying the atrial conduction velocity (CV) reveals important information for targeting critical arrhythmia sites that initiate and sustain abnormal electrical pathways, e.g. during atrial flutter. The knowledge about the local CV distribution on the atrial surface thus enhances clinical catheter ablation procedures by localizing pathological propagation paths to be eliminated during the intervention. Several algorithms have been proposed for estimating the CV. All of them are solely based on the local activation times calculated from electroanatomical mapping data. They deliver fa

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Autio, Joonas A., Artem Shatillo, Rashid Giniatullin, and Olli H. Gröhn. "Parenchymal Spin-Lock fMRI Signals Associated with Cortical Spreading Depression." Journal of Cerebral Blood Flow & Metabolism 34, no. 5 (2014): 768–75. http://dx.doi.org/10.1038/jcbfm.2014.16.

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We found novel types of parenchymal functional magnetic resonance imaging (fMRI) signals in the rat brain during large increases in metabolism. Cortical spreading depression (CSD), a self-propagating wave of cellular activation, is associated with several pathologic conditions such as migraine and stroke. It was used as a paradigm to evoke transient neuronal depolarization leading to enhanced energy consumption. Activation of CSD was investigated using spin-lock (SL), diffusion, blood oxygenation level-dependent and cerebral blood volume fMRI techniques. Our results show that the SL-fMRI signa

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Bian, Nannan, Yi Yuan, Yingwei Li, Mengyang Liu, and Xiaoli Li. "Low-Intensity Pulsed Ultrasound Stimulation Inhibits Cortical Spreading Depression." Cerebral Cortex 31, no. 8 (2021): 3872–80. http://dx.doi.org/10.1093/cercor/bhab055.

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Abstract Cortical spreading depression (CSD), which is closely correlated with migraine aura, cerebral ischemia, seizure, and brain injury, is a spreading wave of neuronal and glial depolarization. The purpose of this study is to investigate whether low-intensity pulsed ultrasound stimulation (PUS) inhibits CSD by modulating neural activity and hemodynamics. Behavioral test, intrinsic signal optical imaging and western blot analysis were used for evaluating the inhibition effect of PUS on CSD in rat. We found that: 1) 30 min of PUS can significantly improve motor activity of rat with CSD. 2) B

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Botta, Federica, Matteo Calafà, Pasquale C. Africa, Christian Vergara, and Paola F. Antonietti. "High-order discontinuous Galerkin methods for the monodomain and bidomain models." Mathematics in Engineering 6, no. 6 (2024): 726–41. https://doi.org/10.3934/mine.2024028.

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<p>This work aims at presenting a discontinuous Galerkin (DG) formulation employing a spectral basis for two important models employed in cardiac electrophysiology, namely the monodomain and bidomain models. The use of DG methods is motivated by the characteristic of the mathematical solution of such equations which often corresponds to a highly steep wavefront. Hence, the built-in flexibility of discontinuous methods in developing adaptive approaches, combined with the high-order accuracy, can well represent the underlying physics. The choice of a semi-implicit time integration allows f

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Yussuff, Abayomi Isiaka, and Nor Hisham Haji Khamis. "Rain Attenuation Prediction Model for Lagos at Millimeter Wave Bands." Journal of Atmospheric and Oceanic Technology 31, no. 3 (2014): 639–46. http://dx.doi.org/10.1175/jtech-d-13-00024.1.

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Abstract Lagos, Nigeria (6.35°N, 3.2°E), is a coastal station in the rain forest area of southwestern Nigeria with an altitude of 38 m. Since most communication now takes place above the X band because of congestion of lower bands, it was necessary to look into ways of maximizing X-band usage. There are inadequate data for use in rain propagation studies at microwave frequencies, and even less so at millimeter wave bands where most of the signal depolarization and fading has been discovered to exist. The proposed model is a modification of the International Telecommunication Union–Radio Commun

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Momose-Sato, Yoko, Tomoharu Nakamori, and Katsushige Sato. "Spontaneous depolarization wave in the mouse embryo: origin and large-scale propagation over the CNS identified with voltage-sensitive dye imaging." European Journal of Neuroscience 35, no. 8 (2012): 1230–41. http://dx.doi.org/10.1111/j.1460-9568.2012.07997.x.

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