contraction

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contraction,

in physics: see expansionexpansion,
in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the
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.

contraction,

in writing: see abbreviationabbreviation,
in writing, arbitrary shortening of a word, usually by cutting off letters from the end, as in U.S. and Gen. (General). Contraction serves the same purpose but is understood strictly to be the shortening of a word by cutting out letters in the middle, the omission
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.

contraction

[kən′trak·shən]
(graphic arts)
A microfilm defect in the form of a compressed image that occurs when the film speed is reduced as the document passes through a rotary microfilmer.
(mathematics)
A function f from a metric space to itself for which there is a constant K that is less than 1 such that, for any two elements in the space, a and b, the distance between f (a) and f (b) is less than K times the distance between a and b.
(mechanics)
The action or process of becoming smaller or pressed together, as a gas on cooling.
(physiology)
Shortening of the fibers of muscle tissue.

contraction

Of concrete, the sum of volume changes occurring as the result of all processes affecting the bulk volume of a mass of concrete.

contraction

1. Physiol any normal shortening or tensing of an organ or part, esp of a muscle, e.g. during childbirth
2. Pathol any abnormal tightening or shrinking of an organ or part

contraction

References in periodicals archive ?
As a component of the electron transport chain, CoQ10 plays a key role in energy production, and is therefore essential for all energy-dependent process, including myocardial contraction. Myocardial concentrations of CoQ10 are significantly lower in patients with congestive heart failure (CHF) than in healthy people, but these levels can be increased by oral administration of CoQ10.
A number of the actions of levosimendan contribute to improved oxygen handling and reduced cardiac work during myocardial contraction. Energy expenditure occurs with excitation-contraction coupling and calcium reuptake within the myocyte.
This could be especially important during exercise at higher heart rates, when the myocardial contraction inhibits coronary artery flow.
Myocardial contraction and relaxation abnormalities readily identified by tissue Doppler are the primary abnormalities.
Autopsy data have shown a tenfold prevalence of myocardial contraction band necrosis in preeclamptic patients if compared with pregnant women that died from other causes [47].