| repetitive DNA | <molecular biology> Nucleotide sequences in DNA that are present in the genome as numerous copies. Originally identified by the C0t_ value derived from kinetic studies of DNA renaturation. These sequences are not thought to code for polypeptides. One class of repetitive DNA, termed highly repetitive DNA, is found as short sequences, 5-100 nucleotides, repeated thousands of times in a single long stretch. It typically comprises 3-10% of the genomic DNA and is predominantly satellite DNA. Another class, which comprises 25-40% of the DNA and termed moderately repetitive DNA, usually consists of sequences about 150 to 300 nucleotides in length dispersed evenly throughout the genome and includes Alu sequences and transposons. (18 Nov 1997) |
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| repetitive sequences, nucleic acid | Nucleotide sequences present in multiple copies in the genome. They include direct, inverted, tandem, and terminal repeat sequences and the alu family repeat (named for the restriction endonuclease cleavage enzyme alu I). (12 Dec 1998) |
| repkie | <zoology> Any edible sea urchin. Origin: From the native name. Source: Websters Dictionary (01 Mar 1998) |
| replace | 1. To place again; to restore to a former place, position, condition, or the like. "The earl . . . Was replaced in his government." (Bacon) 2. To refund; to repay; to restore; as, to replace a sum of money borrowed. 3. To supply or substitute an equivalent for; as, to replace a lost document. "With Israel, religion replaced morality." (M. Arnold) 4. To take the place of; to supply the want of; to fulfull the end or office of. "This duty of right intention does not replace or supersede the duty of consideration." (Whewell) 5. To put in a new or different place. The propriety of the use of replace instead of displace, supersede, take the place of, as in the third and fourth definitions, is often disputed on account of etymological discrepancy; but the use has been sanctioned by the practice of careful writers. <chemistry> Replaced crystal, a crystal having one or more planes in the place of its edges or angles. Origin: Pref. Re- + place: cf. F. Replacer. Source: Websters Dictionary (01 Mar 1998) |
| replaceable | 1. Capable or admitting of being put back into a place. 2. Admitting of having its place supplied by a like thing or an equivalent; as, the lost book is replaceable. 3. <chemistry> Capable of being replaced (by), or of being exchanged (for); as, the hydrogen of acids is replaceable by metals or by basic radicals. Source: Websters Dictionary (01 Mar 1998) |
| replacement | 1. The act of replacing. 2. <chemistry> The removal of an edge or an angle by one or more planes. Source: Websters Dictionary (01 Mar 1998) |
| replacement bone | A bone that develops in a cartilage environment after the latter is partially or entirely destroyed by calcification and subsequent resorption. Synonym: cartilage bone, replacement bone. (05 Mar 2000) |
| replacement fibrosis | The formation of fibrous tissue that occupies sites where various other cells and tissues have become atrophied, or degenerated and necrotic. (05 Mar 2000) |
| replacement therapy | Therapy designed to compensate for a lack or deficiency arising from inadequate nutrition, from certain dysfunctions (e.g., glandular hyposecretion), or from losses (e.g., haemorrhage); replacement may be physiological or may entail administration of a substitute (e.g., a synthetic oestrogen in place of estradiol). (05 Mar 2000) |
| replacement vector | A cloning vector, such as a bacteriophage, in which some of the DNA of the vector can be replaced with foreign DNA. (09 Oct 1997) |
| replant | To plant again. Source: Websters Dictionary (01 Mar 1998) |
| replantable | That may be planted again. Source: Websters Dictionary (01 Mar 1998) |
| replantation | The act of planting again; a replanting. Source: Websters Dictionary (01 Mar 1998) |
| replenish | 1. To fill again after having been diminished or emptied; to stock anew; hence, to fill completely; to cause to abound. "Multiply and replenish the earth." (Gen. I. 28) "The waters thus With fish replenished, and the air with fowl." (Milton) 2. To finish; to complete; to perfect. "We smothered The most replenished sweet work of nature." (Shak) Origin: OE. Replenissen, OF. Replenir; L. Pref. Re- re- + plenus full. See Full, -ish, and cf. Replete. Source: Websters Dictionary (01 Mar 1998) |
| repletion | 1. The state of being replete; superabundant fullness. "The tree had too much repletion, and was oppressed with its own sap." (Bacon) "Replecioun [overeating] ne made her never sick." (Chaucer) 2. <medicine> Fullness of blood; plethora. Origin: L. Repletio a filling up: cf. F. Repletion. See Replete. Source: Websters Dictionary (01 Mar 1998) |