channel

(redirected from Water Channel)
Also found in: Dictionary, Thesaurus, Financial, Encyclopedia, Wikipedia.

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 ?
Orientation parameters at different ciistanees from skin surface to water channel surface.
In addition, unlike a wind tunnel in which the air blows past a stationary model, the water channel allows the model to move against a quiet background.
Local people and relatives started search for Zakir Ahmed whose body with signs of torture was found today from a water channel.
Many villagers who watched the incident from their homes on either side of the water channel rushed to recover them but to no avail.
In another incident two teenage boys 15 years old Gohar Rehman and 16 years old Raza went to Ghazi water channel on their bicycles and could not come back homes, their bicycles were found near the Ghazi water channel and it was feared that both have drowned in the water.
TAXILA -- Two brothers drowned to death in a water channel in Nartoppa village, in the limits of the Hazro police station, on Sunday.
Holding placards inscribed with slogans about initiatives for the growers, the farmers said that particular water channel had been in shabby condition for a long due to negligence of Irrigation department as its concerned staff was derelict in their duty to carry out its maintenance or repair work on regular basis.
Engel also has come up with a new technique whereby the cored water channel is sealed after water evacuation, using some of the overflow material initially cored out by the water.
The flow patterns in a mold water channel (and the cooling rates associated with them) can be defined by the Reynolds number (Re).