| gatc | An abbreviation which stands for the four nitrogenous bases that are found in DNA: Guanine, Adenine, Thymine, and Cytosine. (09 Oct 1997) |
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| Gatch | Willis D., U.S. Surgeon, 1878-1961. See: Gatch bed. (05 Mar 2000) |
| Gatch bed | A bed with divided sections for independent elevation of a patient's head and knees. (05 Mar 2000) |
| gate | 1. A way; a path; a road; a street (as in Highgate). "I was going to be an honest man; but the devil has this very day flung first a lawyer, and then a woman, in my gate." (Sir W. Scott) 2. Manner; gait. Origin: Icel. Gata; akin to SW. Gata street, lane, Dan. Gade, Goth. Gatwo, G. Gasse. Cf. Gate a door, Gait. 1. A large door or passageway in the wall of a city, of an inclosed field or place, or of a grand edifice, etc.; also, the movable structure of timber, metal, etc, by which the passage can be closed. 2. An opening for passage in any inclosing wall, fence, or barrier; or the suspended framework which closes or opens a passage. Also, figuratively, a means or way of entrance or of exit. "Knowest thou the way to Dover? Both stile and gate, horse way and footpath." (Shak) "Opening a gate for a long war." (Knolles) 3. A door, valve, or other device, for stopping the passage of water through a dam, lock, pipe, etc. 4. The places which command the entrances or access; hence, place of vantage; power; might. "The gates of hell shall not prevail against it." (Matt. Xvi. 18) 5. In a lock tumbler, the opening for the stump of the bolt to pass through or into. 6. The channel or opening through which metal is poured into the mold; the ingate. The waste piece of metal cast in the opening; a sprue or sullage piece. Alternative forms: geat and git] Gate chamber, a recess in the side wall of a canal lock, which receives the opened gate. Gate channel. See Gate. Gate hook, the hook-formed piece of a gate hinge. Gate money, entrance money for admission to an inclosure. Gate tender, one in charge of a gate, as at a railroad crossing. Gate valva, a stop valve for a pipe, having a sliding gate which affords a straight passageway when open. <anatomy> Gate vein, to enter a college inclosure after the hour to which a student has been restricted. To stand in the gate, or gates, to occupy places or advantage, power, or defense. Origin: OE. Et, eat, giat, gate, door, AS. Geat, gat, gate, door; akin to OS, D, & Icel. Gat opening, hole, and perh. To E. Gate a way, gait, and get, v. Cf. Gate a way in the wall, 3d Get. Source: Websters Dictionary (01 Mar 1998) |
| gate-control hypothesis | A theory to explain the mechanism of pain; small fibre afferent stimuli, particularly pain, entering the substantia gelatinosa can be modulated by large fibre afferent stimuli and descending spinal pathways so that their transmission to ascending spinal pathways is blocked (gated). Synonym: gate-control hypothesis. (05 Mar 2000) |
| gate-control theory | A theory to explain the mechanism of pain; small fibre afferent stimuli, particularly pain, entering the substantia gelatinosa can be modulated by large fibre afferent stimuli and descending spinal pathways so that their transmission to ascending spinal pathways is blocked (gated). Synonym: gate-control hypothesis. (05 Mar 2000) |
| gated blood pool imaging | Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at specific times in the cycle, using an electrocardiographic synchroniser or gating device. Analysis of right ventricular function is difficult with this technique; that is best evaluated by first-pass ventriculography (ventriculography, first-pass). (12 Dec 1998) |
| gated ion channel | <physiology> Transmembrane proteins of excitable cells, that allow a flux of ions to pass only under defined circumstances. Channels may be either voltage gated, such as the sodium channel of neurons or ligand gated such as the acetylcholine receptor of cholinergic synapses. Channels tend to be relatively ion specific and allow fluxes of typically 1000 ions to pass in around 1ms, they are thus much faster at moving ions across a membrane than transport ATPases. (05 May 1997) |
| gated radionuclide angiocardiography | Radionuclide angiocardiography using cardiac gating to combine images from several cardiac cycles to improve the quality of the images of separate phases (e.g., systole and diastole). (05 Mar 2000) |
| gatekeeper | A health professional, typically a physician or nurse, who has the first encounter with a patient and who thus controls the patient's entry into the health care system. (05 Mar 2000) |
| gather | 1. To come together; to collect; to unite; to become assembled; to congregate. "When small humors gather to a gout." (Pope) "Tears from the depth of some divine despair Rise in the heart, and gather to the eyes." (Tennyson) 2. To grow larger by accretion; to increase. "Their snowball did not gather as it went." (Bacon) 3. To concentrate; to come to a head, as a sore, and generate pus; as, a boil has gathered. 4. To collect or bring things together. "Thou knewest that I reap where I sowed not, and gather where I have not strewed." (Matt. Xxv. 26) 1. To bring together; to collect, as a number of separate things, into one place, or into one aggregate body; to assemble; to muster; to congregate. "And Belgium's capital had gathered them Her beauty and her chivalry." (Byron) "When he had gathered all the chief priests and scribes of the people together." (Matt. Ii. 4) 2. To pick out and bring together from among what is of less value; to collect, as a harvest; to harvest; to cull; to pick off; to pluck. "A rose just gathered from the stalk." (Dryden) "Do men gather grapes of thorns, or figs of thistles?" (Matt. Vii. 16) "Gather us from among the heathen." (Ps. Cvi. 47) 3. To accumulate by collecting and saving little by little; to amass; to gain; to heap up. "He that by usury and unjust gain increaseth his substance, he shall gather it for him that will pity the poor." (Prov. Xxviii. 8) "To pay the creditor . . . He must gather up money by degrees." (Locke) 4. To bring closely together the parts or particles of; to contract; to compress; to bring together in folds or plaits, as a garment; also, to draw together, as a piece of cloth by a thread; to pucker; to plait; as, to gather a ruffle. "Gathering his flowing robe, he seemed to stand In act to speak, and graceful stretched his hand." (Pope) 5. To derive, or deduce, as an inference; to collect, as a conclusion, from circumstances that suggest, or arguments that prove; to infer; to conclude. "Let me say no more Gather the sequel by that went before." (Shak) 6. To gain; to win. "He gathers ground upon her in the chase." (Dryden) 7. To bring together, or nearer together, in masonry, as where the width of a fireplace is rapidly diminished to the width of the flue, or the like. 8. To haul in; to take up; as, to gather the slack of a rope. To be gathered to one's people, or to one's fathers to die. To gather breath, to recover normal breathing after being out of breath; to get breath; to rest. To gather one's self together, to collect and dispose one's powers for a great effort, as a beast crouches preparatory to a leap. To gather way, to begin to move; to move with increasing speed. Origin: OE. Gaderen, AS. Gaderian, gadrian, fr. Gador, geador, together, fr. Gaed fellowship; akin to E. Good, D. Gaderen to collect, G. Gatte husband, MHG. Gate, also companion, Goth. Gadiliggs a sister's son. See Good, and cf. Together. Source: Websters Dictionary (01 Mar 1998) |
| gathering | Assembling; collecting; used for gathering or concentrating. Gathering board, a table or board on which signatures are gathered or assembled, to form a book. Gathering coal, a lighted coal left smothered in embers over night, about which kindling wood is gathered in the morning. Gathering hoop, a hoop used by coopers to draw together the ends of barrel staves, to allow the hoops to be slipped over them. Gathering peat. A piece of peat used as a gathering coal, to preserve a fire. In Scotland, a fiery peat which was sent round by the Borderers as an alarm signal, as the fiery cross was by the Highlanders. Source: Websters Dictionary (01 Mar 1998) |
| gating | 1. In a biological membrane, the opening and closing of a channel, believed to be associated with changes in integral membrane proteins. 2. A process in which electrical signals are selected by a gate, which passes such signals only when the gate pulse is present to act as a control signal, or passes only the signals that have certain characteristics. See: gate. (05 Mar 2000) |
| gating current | <physiology> Small currents in the membrane just prior to the increase in ionic permeability, due to the movement of charged particles within the membrane. So called because they open the gates for current flow through ion channels. (20 Mar 1998) |
| gating mechanism | Occurrence of the maximum refractory period among cardiac conducting cells approximately 2 mm proximal to the terminal Purkinje fibres in the ventricular muscle, beyond which the refractory period is shortened through a sequence of Purkinje cells, transitional cells, and muscular cells; gating mechanism may be a cause of ventricular aberration, bidirectional tachycardia, and concealed extrasystoles, a mechanism by which painful impulses may be blocked from entering the spinal cord. Compare: gate-control theory. (05 Mar 2000) |