Results 201 to 210 of about 48,813 (224)
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Oscillation and noise determine signal transduction in shark multimodal sensory cells
Nature, 1994Oscillating membrane potentials that generate rhythmic impulse patterns are considered to be of particular significance for neuronal information processing. In contrast, noise is usually seen as a disturbance which limits the accuracy of information transfer.
Hans A. Braun +5 more
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Calcium signalling in non-excitable cells: Notes on oscillations and store refilling
Cell Calcium, 1989Technical advances in studying cellular calcium concentrations, and discoveries about many aspects of signal transduction have transformed this field of biology since this Journal was launched a decade ago. At that time monitoring of the key variable, cytoplasmic free Ca2+ concentration [Ca2+]i, was possible with aequorin or arsenazo ill mainly in ...
T.J. Hallam, Timothy J. Rink
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Adenylate cyclase activity oscillations as signals for cell aggregation in Dictyostelium discoideum
Nature, 1977As well as acting as a chemotactic factor1 cyclic AMP stimulates cells of Dictyostelium discoideum to differentiate after the end of growth into aggregation-competent cells. These differentiation signals have a temporal pattern : pulses are efficient signals, whereas continuous administration of cyclic AMP may even have an adverse effect2,3.
G. Gerisch, W. Roos, C. Scheidegger
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Small signal cell stability with focus on inter-cell oscillations in the web-of-cells framework
2017 IEEE 58th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON), 2017The paper aims at describing observables used in small signal stability assessment based on Energy-Sorted Prony's method focusing at area and inter-area level of the power system. Presented research studies are based on a new way of power system operation, namely Web-of-cell concept, devised within FP7 IRP ELECTRA.
Artjoms Obushevs, Michal Kosmecki
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Journal of Cellular Physiology, 2021
AbstractA persistent basal tone in the internal anal sphincter (IAS) is essential for keeping the anal canal closed and fecal continence; its inhibition via the rectoanal inhibitory reflex (RAIR) is required for successful defecation. However, cellular signals underlying the IAS basal tone remain enigmatic.
Lawrence M. Lifshitz +8 more
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AbstractA persistent basal tone in the internal anal sphincter (IAS) is essential for keeping the anal canal closed and fecal continence; its inhibition via the rectoanal inhibitory reflex (RAIR) is required for successful defecation. However, cellular signals underlying the IAS basal tone remain enigmatic.
Lawrence M. Lifshitz +8 more
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Experientia, 1992
We investigate how the introduction of cells oscillating periodically affects the behaviour of a suspension of Dictyostelium discoideum amoebae undergoing chaotic oscillations of cyclic AMP. The analysis of a model indicates that a tiny proportion of periodic cells suffices to transform chaos into periodic oscillations in such suspensions.
Li, Yue-Xian +4 more
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We investigate how the introduction of cells oscillating periodically affects the behaviour of a suspension of Dictyostelium discoideum amoebae undergoing chaotic oscillations of cyclic AMP. The analysis of a model indicates that a tiny proportion of periodic cells suffices to transform chaos into periodic oscillations in such suspensions.
Li, Yue-Xian +4 more
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The European Physical Journal B, 2010
This paper investigates the effect of integration of intracellular and extracellular signals on collective dynamics based on a multicellular system with cell-to-cell communication. Using a mathematical model of genetic repressilators coupled to quorum sensing, we show that the changes in parameters of a certain kind of cis-regulatory input function ...
Zhanjiang Yuan +4 more
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This paper investigates the effect of integration of intracellular and extracellular signals on collective dynamics based on a multicellular system with cell-to-cell communication. Using a mathematical model of genetic repressilators coupled to quorum sensing, we show that the changes in parameters of a certain kind of cis-regulatory input function ...
Zhanjiang Yuan +4 more
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On the effect of circadian oscillations on biochemical cell signaling by NF−κB
Journal of Theoretical Biology, 2013We report the results of a numerical investigation of a mathematical model for NF-κB oscillations, described by a set of ordinary nonlinear differential equations, when perturbed by a circadian oscillation. The main result is that a circadian rhythm, even when it represents a weak perturbation, enhances the signaling capabilities of NF-κB oscillations.
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Neuron, 1991
Intercellular Ca2+ signaling in primary cultures of glial cells was investigated with digital fluorescence video imaging. Mechanical stimulation of a single cell induced a wave of increased [Ca2+]i that was communicated to surrounding cells. This was followed by asynchronous Ca2+ oscillations in some cells.
Jean E. Merrill +3 more
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Intercellular Ca2+ signaling in primary cultures of glial cells was investigated with digital fluorescence video imaging. Mechanical stimulation of a single cell induced a wave of increased [Ca2+]i that was communicated to surrounding cells. This was followed by asynchronous Ca2+ oscillations in some cells.
Jean E. Merrill +3 more
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Role of mitochondria in Ca2+ oscillations and shape of Ca2+ signals in pancreatic acinar cells
Biochemical Pharmacology, 2002We studied the role of mitochondria in Ca(2+) signals in fura-2 loaded exocrine pancreatic acinar cells. Mitochondrial depolarization in response to carbonylcyanide-p-tryfluoromethoxyphenyl hydrazone or rotenone (assessed by confocal microscopy using rhodamine-123) induced a partial but statistically significant reduction in the decay of Ca(2+) signals
Pedro J. Camello +3 more
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