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abetalipoproteinaemia

Overview page. Subjects: Medicine and Health — Chemistry.

An autosomal recessive defect (acanthocytosis, Bassen–Kornweig syndrome) in which there is total absence of apolipoprotein B (a component of LDL, VLDL, and chylomicrons) caused by a defect...

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ablation

Overview page. Subjects: Medicine and Health — Chemistry.

The removal or excision of a piece of tissue, usually by surgery. Surface ablation of the skin may be carried out by chemicals or laser.

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abnormal

Overview page. Subjects: Psychology — Medicine and Health.

Departing from what is usual or what is the rule or norm (1, 2). [From Latin ab from  +  norma a rule  +  -alis of or relating to]

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abortus

Overview page. Subjects: Medicine and Health — Genetics and Genomics.

A dead fetus born prematurely, whether the abortion was artificially induced or spontaneous. Over 20% of human spontaneous abortions show chromosomal abnormalities. See Chronology, 1965,...

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abreaction

Overview page. Subjects: Psychology — Medicine and Health.

(ab-ree-ak-shŏn)

the release of strong emotion commonly associated with a buried memory. Abreaction may be induced as a treatment for conversion disorder, anxiety state, and other...

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abscissa

Overview page. Subjects: Public Health and Epidemiology — Chemistry.

The horizontal or X axis of a graph; the vertical or Y axis is the ordinate, and the two axes are the Cartesian coordinates.

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absolute error

Overview page. Subjects: Psychology — Sports and Exercise Medicine.

In psychophysics, the difference between the judged value of a stimulus and its true value, ignoring the direction of the difference. Compare relative error. [Alluding to the mathematical...

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absolute refractory period

Overview page. Subjects: Sports and Exercise Medicine — Psychology.

A refractory period (2), lasting up to 2 milliseconds after the onset of an action potential, during which no stimulus (5) can initiate another nerve impulse in the neuron. Compare relative...

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abstinence syndrome

Overview page. Subjects: Sports and Exercise Medicine — Psychology.

A pattern of signs and symptoms associated with withdrawal in a drug-dependent person who is suddenly deprived of a regular supply of the drug and is forced to practise abstinence (1).

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abzyme

Overview page. Subjects: Medicine and Health — Science and Mathematics.

Catalytic antibodies. A class of monoclonal antibodies that bind to and stabilize molecules in the transition state through which they must pass to form products. See enzyme.

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