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gate

 [gāt]
1. an electronic circuit that passes a pulse only when a signal (the gate pulse) is present at a second input.
2. a mechanism for opening or closing a protein channel in a cell membrane, regulated by a signal such as increased concentration of a neurotransmitter, change in electrical potential, or physical binding of a ligand molecule to the protein to cause a conformational change in the protein molecule.
3. to open and close selectively and function as a gate.

gate

(gāt),
1. To close an ion channel by electrical (for example, membrane potential) or chemical (for example, neurotransmitter) action.
See also: cardiac gating.
2. Action of a special nerve fiber to block the transmission of impulses through a synapse, for example, gating of pain impulses at synapses in the dorsal horns.
See also: cardiac gating.
3. A device that can be switched electronically to control the passage of a signal.
See also: cardiac gating.
4. To use a physiologic signal, such as an ECG, to trigger an event such as an x-ray exposure or to partition continuously collected data.
See also: cardiac gating.
[O.E. geat]

gate

[gāt]
1 n, an electronic circuit that passes a pulse only when a signal (the gate pulse) is present at a second input.
2 n, a mechanism for opening or closing a protein channel in a cell membrane, regulated by a signal such as increased concentration of a neurotransmitter, change in electrical potential, or physical binding of a ligand molecule to the protein to cause a conformational change in the protein molecule.
3 v, to open and close selectively and function as a gate.
Cell biology A structure composed of one or more proteins that regulate passage of ions through channels in the cell membrane; gates may be chemically regulated—by neurotransmitters—or voltage regulated—in response to a threshold level of depolarization
Drug slang A regional term for Spanish heroin
Informatics An electronic circuit that performs an operation when the criteria for a logical relation—e.g., AND, or OR—are fulfilled
Immunology verb To limit the size of cells detected and their fluorescence in flow cytometry to increase the purity of cell population being analysed or sorted
Vox populi A new root form derived from the Watergate scandal which toppled the Nixon administration; -gate has been applied to various scandals. Medically-related -gates include AIDSgate and Bloodgate
References in periodicals archive ?
A private security firm was hired to enforce the policy, which resulted in widespread resentment and some crowd- and traffic-control problems, including groups of angry gate-crashers.
On a tumultuous evening that also featured an emergency landing by a small plane on nearby Victory Boulevard shortly after the fireworks began, Pierce and Los Angeles police had to deal with groups of angry gate-crashers and ``unbelievable'' overflow residential traffic in the campus area because of the new policy, said Los Angeles police Sgt.
However, the party's now over as the guests, lodgers and even the gate-crashers, have all moved on.
Three women claim they were gang raped after their drinks were spiked by gate-crashers at private parties in Merthyr Tydfil, south Wales.
These are parties where the women thought they were safe to mingle - but they were approached by gate-crashers.
SEVENTY gate-crashers trashed a house causing pounds 10,000 worth of damage after a DJ at a nighclub announced that a party was going on.
Rich is the heritage California enjoys from its quarter century of Mexican governance, but tolerance toward illegal aliens - Yankee gate-crashers with names largely forgotten, men like Thomas O.
A BASH thrown by shamed Lottery millionaire Nigel Gardner-Hale was stormed by gate-crashers who passed around drug-spiked water, it was claimed last night.
With a field of 38,500 expected, organizers say gate-crashers threaten the safety and efficiency of the race for the official entrants.
He also employed a team of bouncers to keep out gate-crashers and even banned guests from bringing cameras.
A Family barbecue turned into a bloodbath when gate-crashers burst into the garden and lashed out with a meat cleaver, baseball bat and hammer.