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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 NEC One Global Channel Program helps us maintain close cooperation across our regions, ensuring we're providing our partners with the communication and support they need to serve their customers."
For more information about the Telseon Channel Program or to become a partner, call the Channel Sales Information Line at 866/773-3344 or e-mail channelsales@telseon.com.
"After successfully educating the partners in the west, we started to extend the Total Value Channel Program in few of our tier II cities," said Shibu Paul, National Sales Manager - India at Array Networks.
The Channel Marketer's Toolbox series is designed to deliver best practices and technology insights for building comprehensive channel programs and providing partners the necessary tools to increase their sales and effectiveness.
According to the company, its Channel Program also conveniently centralises its online resources, which are now accessible through Single Sign-On (SSO) on the ARRIS channel web page.
With its new security-focused channel program, Hexis is working with partners throughout Europe, the Middle East, Africa and the Asia-Pacific region to provide enterprise customers with access to the HawkEye family of products and services, including HawkEye AP and HawkEye G.
The survey asks VARs to rate their partners in seven categories, including support and service offering, channel friendliness, channel programs, product features, product reliability, product innovation, and adequate VAR Margin.
Avayas efforts to improve its channel program fall into three key areas: simplification, speed of commerce, skills development all designed to enable partners to succeed as businesses transition to Cloud solutions, engage in digital transformation and look to the advantages of new and emerging technologies such as artificial intelligence, machine learning and blockchain.
"In the past 12 months, Huawei has more than doubled its channel partners in the US, and Hula, Aspire and Nitech are great additions to our growing channel program," said Jun Xu, Vice President of Technical Solutions & Marketing at Huawei Enterprise USA.
Revolution or RevoluKIOn is more than just a marketing campaign, said Jorge Daz, Kio partner and channel program assistant director.
Voted by the magazine's VAR subscribers, winners were awarded for top performance in categories such as service/support, channel friendliness, channel program and product innovation.