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Elongation: The distance of a planet from the Sun, as viewed from Earth. The maximum elongation for the inferior planets is 28° for Mercury, and 48° for Venus. Mercury can therefore only form a conjunct . . . View Full Definition

Region Of Elongation: The area in the tip of a plant root where cells grow by elongating, thereby increasing the length of the root.

Zone Of Elongation: Area in plant roots where recently produced cells grow and elongate prior to differentiation.

Foliation: The planar or layered characteristics of metamorphic rocks that are evidence of the pressures and/or temperatures to which the rock was exposed. These can be structural such as cleavage, tex . . . View Full Definition

Nasal Spine: A median, sharp process formed by the forward elongation of the maxillae at the lower margin of the anterior aperture of the nose. Used to support a maxillary subperiosteal implant.

Polymerase Chain Reaction (PCR): A method of amplifying or copying DNA fragments that is faster than cloning. The fragments are combined with DNA polymerase, nucleotides, and other components to form a mixture in which the . . . View Full Definition

Gibberellins: A group of hormones that stimulate cell division and elongation in plants. Gibberellic acid (GA), the first of this class to be discovered, causes bolting (extreme elongation) of stems. GA i . . . View Full Definition

Translation: The synthesis of protein on a template of messenger RNA; consists of three steps: initiation, elongation, and termination. Making of a polypeptide sequence by translating the genetic code of . . . View Full Definition

Elastic Limit: The greatest stress the material can withstand without permanent elongation when all load has been removed from the specimen. Any strains developed up to the elastic limit are both small and . . . View Full Definition