| alternating tremor | A form of hyperkinesia characterised by regular, symmetrical, to-and-fro movements (at about 4 per second) that are produced by patterned, alternating contraction of muscles and their antagonists. (05 Mar 2000) |
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| alternation | 1. The reciprocal succession of things in time or place; the act of following and being followed by turns; alternate succession, performance, or occurrence; as, the alternation of day and night, cold and heat, summer and winter, hope and fear. 2. <mathematics> Permutation. 3. The response of the congregation speaking alternately with the minister. Alternation of generation. See Generation. Origin: L. Alternatio: cf. F. Alternation. Source: Websters Dictionary (01 Mar 1998) |
| alternation of generations | The occurrence in one life history of two or more different forms differently produced, usually an alternation of a sexual with an asexual form. (09 Oct 1997) |
| alternative | Available in place of something else. (18 Nov 1997) |
| alternative hypothesis | In Neyman-Pearson testing of a hypothesis, the hypothesis or family of hypotheses about the numerical value of a parameter if and only if the null hypothesis is rejected as untenable. (05 Mar 2000) |
| alternative inheritance | Galton's term for an assumed form in which all the characters are derived from one parent. (05 Mar 2000) |
| alternative medicine | A catch-all phrase for a long list of treatments or medicinal systems including traditional systems such as Chinese or Ayurvedic medicine, homeopathy, various herbals and other miscellaneous treatments that have not been accepted by the mainstream, or Western, medical establishment. Alternative medicine is also referred to as complementary medicine (see). The designation alternative medicine is not equivalent to holistic medicine, which is a more narrow term. See: Holistic Medicine. (09 Oct 1997) |
| alternative mRNA splicing | Splicing different exons in or out of messenger RNA to form different mRNA transcripts. (09 Oct 1997) |
| alternative oxidase | <enzyme> The terminal oxidase in alternative pathway respiration, as seen in plants like sauromatum guttatum (voodoo lily); amino acid sequence for tobacco alternative oxidase (aox1) in first source Registry number: EC 1.- Synonym: aox1 gene product, aox2 gene product, aox3 gene product (26 Jun 1999) |
| alternative oxidase pathway | Pathway of mitochondrial electron transport in higher plants, particularly in fruits and seeds, that does not involve cytochrome oxidase and thus is resistant to cyanide. (18 Nov 1997) |
| alternative pathway | See: complement activation. (18 Nov 1997) |
| alternative splicing | A process whereby multiple protein isoforms are generated from a single gene. Alternative splicing involves the splicing together of nonconsecutive exons during the processing of some, but not all, transcripts of the gene. Thus a particular exon may be connected to any one of several alternative exons to form messenger RNA. The alternative forms produce proteins in which one part is common while the other part is different. (12 Dec 1998) |
| alternative therapy | A term given to nonconventional therapy usually given by persons who do not have a medical qualification. (16 Dec 1997) |
| alternative tremor | A coarse, low frequency (3-8 Hz) pathologic tremor produced by alternating contraction of muscles and their antagonists; seen with Parkinson disease and kinetic predominant action tremor. (05 Mar 2000) |
| alternator | Mechanical apparatus with movable transparent racks to which a large number of radiographs can be attached, to enable selection and viewing in front of a stationary bank of lights. Origin: L. Alterno, to do by turns, fr. Alter, either of two (05 Mar 2000) |
| alternator |
an old term for an electric generator that produces alternating current (especially in automobiles)
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| Alternaria |
(Al
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| alternariosis |
(al
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| alternating |
(al
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| alternation of the heart |
alternating variation in the intensity of the heartbeat or pulse over successive cardiac cycles of regular rhythm. Called also mechanical alternans. Cf. electrical alternans.
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| altern | in an alternating sequence or position |
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| altern | occurring by turns |
| altern | (electricity) of a current that reverses direction at regular intervals |
| altern | an electric current that reverses direction sinusoidally |
| altern | successive change from one thing or state to another and back again |
| altern | being regularly exchangeable |
| altern | the alternation of two or more different forms in the life cycle of a plant or animal |
| altern | an alternative action |
| altern | necessitating a choice between mutually exclusive possibilities |
| altern | pertaining to unconventional choices |
| altern | allowing a choice |
| altern | a method of childbirth that avoids intrusive high-tech medicine in favor of more natural and homely settings |