gate

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Related to Gates: Bill Gates, Logic gates

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 classic literature ?
I got rid of my injured feelings for the time, by kicking them into the brewery wall, and twisting them out of my hair, and then I smoothed my face with my sleeve, and came from behind the gate.
Draw near to them, my brother; creep into their hearts and learn their counsel or teach them yours; so in the end shall Chaka be brought to that gate through which your wives have passed, and where I also am about to tread.
The two warders at the nearest gate tried to close it, but were shot dead in their tracks.
Hector laid hold of a stone that lay just outside the gates and was thick at one end but pointed at the other; two of the best men in a town, as men now are, could hardly raise it from the ground and put it on to a waggon, but Hector lifted it quite easily by himself, for the son of scheming Saturn made it light for him.
Then the big gate swung slowly open, and they all passed through and found themselves in a high arched room, the walls of which glistened with countless emeralds.
She, who had heard this, walked past under the screen of her woollen veil, till, presently looking back, she perceived that the church party had left the gate with her boots and retreated down the hill.
But Mavra Kuzminichna stood at the closed gate for some time with moist eyes, pensively swaying her head and feeling an unexpected flow of motherly tenderness and pity for the unknown young officer.
After considerably parleying he consented to admit them to the city, and a moment later the wheel-like gate rolled back within its niche, and Thuvia and Carthoris entered the city of Lothar.
From the Hump we can see the gate that is called after Miss Mabel Grey, the Fig I promised to tell you about.
Therefore Jellia, hobbling along like an aged woman, was led from the city gates and taken before Glinda.
Lions, parrots, or men, it must be all the same," and he moved steadily forward in the direction of the gate.
When the gates had been once more secured the self-confidence of the savages returned, and as Tarzan walked up the village street toward the chief's hut he was surrounded by a host of curious men, women, and children.