shift

SYN: change. SEE ALSO: deviation.
- antigenic s. mutation, i.e., sudden change in molecular structure of RNA/DNA in microorganisms, especially viruses, which produces new strains; hosts previously exposed to other strains have little or no acquired immunity to the new strain; antigenic s. is believed to be the explanation for the occurrence of new strains of influenza virus, which occur by recombination or genetic reassortment of 2 different viral strains in a given host, and is associated with large-scale epidemics.
- axis s. SYN: axis deviation.
- chemical s. dependence of the resonance frequency of a nucleus on the chemical binding of the atom or molecule in which it is contained. See chemical s. artifact.
- chloride s. when CO2 enters the blood from the tissues, it passes into the red blood cell and is converted by carbonate dehydratase to bicarbonate (HCO3); HCO3 ion passes out into the plasma while Cl migrates into the red blood cell. Reverse changes occur in the lungs when CO2 is eliminated from the blood. SYN: Hamburger phenomenon.
- Doppler s. the magnitude of the frequency change in hertz when sound and observer are in relative motion away from or toward each other. SEE ALSO: Doppler effect.
- s. to the left 1. a marked increase in the percentage of immature cells in the circulating blood, based on the premise in hematology that the bone marrow with its immature myeloid cells is on the left, while the circulating blood with its mature neutrophils is on the right; SYN: deviation to the left. 2. See maturation index.
- luteoplacental s. the change in site of production of the estrogen and progesterone essential for human pregnancy from the corpus luteum to the placenta; ovariectomy always terminates pregnancy in most mammals because their placentas never produce enough estrogen and progesterone, but, after the sixth week of pregnancy, a human placenta can produce enough of these hormones to prevent abortion despite ovariectomy.
- permanent threshold s. the irreversible hearing loss that results from exposure to intense impulse or continuous sound, as opposed to the reversible temporary threshold s. that also results from such exposure.
- phase s. in nuclear magnetic resonance, the change in phase caused by movement of the spins, which can be used to show fluid flow.
- Purkinje s. SYN: Purkinje phenomenon.
- s. to the right 1. in a differential count of white blood cells in the peripheral blood, the absence of young and immature forms; SYN: deviation to the right. 2. See maturation index.
- temporary threshold s. the reversible hearing loss that results from exposure to intense impulse or continuous sound, as opposed to the irreversible permanent threshold s. that may result from such exposure.
- threshold s. the degree of hearing loss or impairment in terms of a decibel s. from an individual's previous audiogram. After exposure to intense sound, there may be temporary threshold s. with recovery in hours or days or permanent threshold s. (noise-induced hearing loss).

* * *

shift 'shift n a change in place, position, or frequency: as
a) a change in frequency resulting in a change in position of a spectral line or band compare DOPPLER EFFECT
b) a removal or transfer from one thing or place to another see CHLORIDE SHIFT

* * *

(shift) a change, as of position or status.

Medical dictionary. 2011.

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  • Shift — generally means to change (position). Shift may refer to: * Gear shift, to change gears in a car * Shift work, an employment practice * Shift (music), a change of level in music * Shift (magazine), a former Canadian technology and culture… …   Wikipedia

  • Shift — (sh[i^]ft), v. t. [imp. & p. p. {Shifted}; p. pr. & vb. n. {Shifting}.] [OE. shiften, schiften, to divide, change, remove. AS. sciftan to divide; akin to LG. & D. schiften to divide, distinguish, part Icel. skipta to divide, to part, to shift, to …   The Collaborative International Dictionary of English

  • shift — shift; shift·abil·i·ty; shift·able; shift·er; shift·ful; shift·i·ly; shift·i·ness; shift·less; shift·man; make·shift; blue·shift·ed; make·shift·ness; shift·less·ly; shift·less·ness; …   English syllables

  • Shift — Shift, n. [Cf. Icel. skipti. See {Shift}, v. t.] 1. The act of shifting. Specifically: (a) The act of putting one thing in the place of another, or of changing the place of a thing; change; substitution. [1913 Webster] My going to Oxford was not… …   The Collaborative International Dictionary of English

  • Shift — Расположение клавиши Shift Shift  клавиша на клавиатуре компьютера, предназначенная для ввода заглавных букв. При одновременном нажатии клавиши   …   Википедия

  • shift — ► VERB 1) move or change from one position to another. 2) Brit. informal move quickly. 3) (shift oneself) Brit. informal move or rouse oneself. 4) Brit. remove (a stain). 5) informal sell (goods) quickly or in large quantities. 6) …   English terms dictionary

  • shift — [shift] vt. [ME schiften < OE sciftan, to divide, separate < IE * skeib > SHIP] 1. to move or transfer from one person, place, or position to another [to shift the blame] 2. to replace by another or others; change or exchange 3. to… …   English World dictionary

  • Shift — steht für: die Umschalttaste beziehungsweise Hochstelltaste auf Tastaturen Schiften beim Segeln in der Fotografie als Shift Effekt, um Bilder perspektivisch zu entzerren, und Tilt und Shift Objektive, mit denen diese Aufgabe schon bei der… …   Deutsch Wikipedia

  • Shift TV — ist ein webbasierter Dienst, der Internetnutzern seit März 2005 die Möglichkeit bietet, auf einen netzwerkbasierten TV Rekorder, der in einem Rechenzentrum steht, Programme deutscher TV Sender aufzuzeichnen. shift TV wird von der 1997 gegründeten …   Deutsch Wikipedia

  • Shift — Shift, v. i. 1. To divide; to distribute. [Obs.] [1913 Webster] Some this, some that, as that him liketh shift. Chaucer. [1913 Webster] 2. To make a change or changes; to change position; to move; to veer; to substitute one thing for another;… …   The Collaborative International Dictionary of English

  • shift — [n1] switch, fluctuation about face*, alteration, bend, change, changeover, conversion, deflection, deviation, displacement, double, fault, modification, move, passage, permutation, rearrangement, removal, shifting, substitution, tack, transfer,… …   New thesaurus

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