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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

(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.
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]
References in periodicals archive ?
The event educated Forcepoint's channel partners about innovative digital transformation strategies in cybersecurity and the opportunities to grow.
Avaya is also leveraging its market-leading, open standards-based communications platforms to encourage and empower channel partners to provide holistic solutions to their customers.
Since establishing the Fiber Forward Partner Program, Calix has helped Channel Partners meet the evolving needs of their respective markets, said Jean-Francois Rousseau, international channel sales director at Calix.
Connexion Corporate Communications s.a.,a Belgium business-to- business multilingual communications agency and prominent integrator of Web content management software in Europe, independently developed the multilingual content management module and is making the module available to all Hot Banana channel partners and clients.
Each year Captiva identifies its customers and channel partners for their innovative use and endorsement of Captiva's solutions.
We are seeing an incredible level of interest in the SunBox product from consumers and potential channel partners. Providing a simple, efficient solar system to builders, developers and channel partners that is permit-ready is clearly something the market has been seeking and we are excited to be at the forefront of this market opportunity.
The event, held under the theme 'Be Story Ready', celebrated the achievements of channel partners in the kingdom in the last year with a lavish award ceremony with over 150 key Canon channel partner attendees, it added.
“Being recognized as a Top Channel Partner for Aruba Networks is a great accomplishment for Comm Solutions,” said CEO Paul Black.
Karnataka, July 2 -- eScan, one of the leading Anti-Virus and Content Security Solution providers, has announced attractive offers for its channel partners. These lucrative offers are valid on new purchases within the period of June 01, 2014 till September 30, 2014.
We'll act as the voice for channel partners in talking to Microsoft while also reporting on Microsoft strategy." Publisher Henry Allain said that vendors and partners "have been screaming" for a focused channel title.
Additionally, companies must be able to obtain detailed information on individual channel partner activity and performance.
IPCs global channel partner program was launched three years ago.