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elongation

elongation, in astronomy, the angular distance between two points in the sky as measured from a third point. The elongation of a planet is usually measured as the angular distance from the sun to the planet as measured from the earth. When a planet lies on the line drawn from the earth to the sun, its elongation is 0° and is said to be in conjunction. When a planet's elongation is 90°, it is in quadrature. When its elongation is 180°, it is in opposition. Elongation is measured east (eastern quadrature) or west (western quadrature) from the sun. The superior planets can have elongations between 0° and 180°; the elongations of the inferior planets are limited by their proximity to the sun. The greatest elongation of Mercury is 28°, and of Venus, 47°.

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elongation

elongation (in protein synthesis) The phase in which amino acids are linked together by sequentially formed peptide bonds to form a polypeptide chain (see translation). Elongation factors are proteins that – by binding to a tRNA–amino-acid complex – enable the correct positioning of this complex on the ribosome, so that translation can proceed.

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"elongation." A Dictionary of Biology. . Encyclopedia.com. 27 Jul. 2017 <http://www.encyclopedia.com>.

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"elongation." A Dictionary of Biology. . Retrieved July 27, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/elongation