fast channel

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a passage, cut, or groove through which something can pass or flow across a solid structure.
calcium channel (calcium-sodium channel) a slow voltage-gated channel very permeable to calcium ions and slightly permeable to sodium ions, existing in three subtypes designated L, M, and N and located throughout the body; calcium channels are the main cause of action potentials in certain smooth muscles, and the N channels regulate neurotransmitter release.
fast channel a protein channel, such as a sodium channel, that becomes activated relatively quickly; a fast voltage-gated channel has a much lower activation potential than does the slow type. See also slow channel.
ligand-gated channel a protein channel that opens in response to the binding of a molecule (the ligand) to the protein, which causes a conformational change in the protein molecule. See also voltage-gated channel.
potassium channel a slow voltage-gated channel selective for the passage of potassium ions, found on the surface of a wide variety of cells, including nerve, muscle, and secretory cells; its functions include regulation of cell membrane excitability, regulation of repetitive low frequency firing in some neurons, and recovery of the nerve fiber membrane at the end of the action potential.
protein channel a watery pathway through the interstices of a protein molecule by which ions and small molecules can cross a membrane into or out of a cell by diffusion; protein channels play a vital role in depolarization and repolarization of nerve and muscle fibers, and may have physical characteristics such as shape or diameter that particularly attract certain ions.
slow channel a protein channel such as the calcium channel that is slow to become activated; a slow voltage-gated channel has a much higher activation potential than does the fast type. See also fast channel.
sodium channel a type of fast channel selective for the passage of sodium ions. Voltage-gated sodium channels are the main causes of depolarization and repolarization of nerve membranes during the action potential. In cardiac cells they produce phase 0 of the action potential.
voltage-gated channel a protein channel that can be opened or closed in response to changes in the electric potential across a cell membrane. See also ligand-gated channel.
water channel a channel in a cell membrane that permits passage of water molecules; chemical substances such as vasopressin cause the opening of new channels and increase permeability.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
References in periodicals archive ?
Rahbar, "IFCS: an intelligent fast channel switching in IPTV over PON based on human behavior prediction," Multimedia Tools and Applications, vol.
According to the Delay Bound theorem, the delay [] (v) and [d.sub.slow] (v) of the aggregated flow through the fast channel and the slow channel at time v are bounded by
Rak, Video streaming system including a fast channel change mechanism, 2011.
Altunbasak, "A Semi-Distributed Fast Channel Change Framework for IPTV Networks," IEEE, 978-1-45770638-7/11, 2011.
These include an interactive middleware system with fast channel change technology, PPV, VOD, time shift TV karaoke, e-learning, PVR or nPVR capabilities for the system to offer to their customers.
Initially Aspiro will provide new clients for iPhone and Android, supporting streaming over mobile or WiFi networks and allowing Telenor users to watch TV on their smartphone with Aspiro TV's functionality for fast channel switching and automatic bandwidth adaption.
And with fast channel change and picture-in-picture browse, you can channel surf between Tennis Channel and other channels without the delay experienced on other digital TV services.