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channel

 [chan´el]
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.

chan·nel

(chan'ĕl),
A furrow, gutter, or groovelike passageway.
See also: canal.
[L. canalis]

channel

/chan·nel/ (chan´ĕl) that through which anything flows; a cut or groove.
gated channel  a protein channel that opens and closes in response to signals, such as binding of a ligand (ligand-gated c.) or changes in the electric potential across the cell membrane (voltage-gated c.) .
potassium channel  a voltage-gated protein channel selective for the passage of potassium ions.
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.
sodium channel  a voltage-gated protein channel selective for the passage of sodium ions.

channel

(chăn′əl)
n.
1. A furrow, tube, or other groovelike passageway through which something flows.
2. An aqueous pathway through a protein molecule in a cell membrane that modulates the electrical potential across the membrane by controlling the passage of small inorganic ions into and out of the cell.

channel

Etymology: L, canalis, pipe
1 a passageway or groove that conveys fluid, such as the central channels that connect the arterioles with the venules.
2 membrane-bound globular proteins that allow diffusion of specific ions and molecules across a cell membrane.
enlarge picture
Membrane channel
Drug slang A regional street term for a vein into which a drug is injected
Paranormal See Channeler, Energy channel
Physiology A multiprotein transmembrane complex—ionophore—with an amphipathic pore, which is hydrophobic on either side of the membrane and hydrophilic inside

channel 

A concept relating to the evidence that information about a particular feature of an image is transmitted and processed in the visual pathway approximately independently of information about other domains. The evidence was obtained from various experiments: matching, threshold elevation, after-effect, etc. Examples: the three channels of colour vision theory; the spatial frequency channels. See waterfall after-effect.

chan·nel

(chan'ĕl)
A furrow, gutter, or groovelike passageway.
[L. canalis]

channel,

n a definite furrow, groove, or tubelike passage.
channel, vascular,
n a blood or lymph vessel through which inflammatory infiltrate and periodontitis proceed from a localized superficial area to involve the deeper structures of the periodontium.

channel

in biophysical terms these are the 'pores' in semipermeable membranes through which specific physicochemical units, e.g. cations, calcium ions, can pass; the rate of passage of some channels may be much slower than others, hence there is an expansive nomenclature, e.g. slow calcium channel, fast calcium channel.
References in periodicals archive ?
Recognized as best-practice on an industry-wide basis, the Hitachi TrueNorth Channel Partner Program has offered rich incentives, tools, and resources and has been instrumental in increasing partner profitability and driving Hitachi Data Systems revenue since its launch in 2004.
The addition of the Channel Partner Program to the existing PostX Technology Alliance and Market Alliance Programs enhances the company's vision and market presence.
The Meru Channel Partner Program will take effect immediately.
We are thrilled that our Channel Partner Program has attracted so many quality partners and resellers," said Joshua Block, Vice President of North American Operations, Cyberoam.
The Channel Partner Program will be managed out of the European headquarters in London, UK.
Our North American channel includes approximately 4,500 resellers who will now have access to sell and market Verso's NetSpective, NetAuditor and TeleMate solutions within the framework and benefits of the newly launched Channel Partner Program," he added.
SecurePipe's Channel Partner Program provides Value Added Resellers, Interconnects, System Integrators, and Consultants with a unique opportunity to offer customers a powerful email security solution.
CRN magazine recognizes the most influential channel executives who consistently create, promote and execute effective channel partner programs and strategies.
The eBridge Connections Channel Partner Program has been designed to generate mutual business growth and long-term success.
EMEDIX Reimbursement solutions is making it probable for reputable vendors in the healthcare IT market to extend their margin by including next-generation revenue cycle management solutions to their current product offerings through the recently introduced Channel Partner Program.
Concerto Software (NASDAQ:CRTO), a proven provider of customer interaction management (CIM) solutions, recently announced the launch of its enhanced Channel Partner Program.
19, 2015 /PRNewswire/ -- EMEDIX Reimbursement Solutions, a leading provider of healthcare billing and claims management software solutions has announced the launch of a dynamic Channel Partner Program.