| bHLH | basic helix-loop-helix |
|---|---|
| bHLH-ZIP | basic helix-loop-helix-leucine zipper |
| HLH | helix-loop-helix; hemophagocytic lymphohistiocytosis |
| HD | Haab-Dimmer [syndrome]; Hajna-Damon [broth]; Hansen disease; hearing distance; heart disease; helix ... |
| HPA | Health Care Practice Act; Health Policy Agenda for the American People; health promotion advocates; ... |
| TFO | triple helix-forming oligonucleotide |
|---|---|
| HLH | B)-helix-loop-helix |
| bHLH | Basic Helix-Loop-Helix |
| bHLH | Basic region helix-loop-helix |
| H-T-H | helix-turn-helix |
| triple helix | The superhelix formed (right-handed) from three individual collagen helices (each being left-handed). (05 Mar 2000) |
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| helix loop helix | <molecular biology> A motif associated with transcription factors, allowing them to recognise and bind to specific DNA sequences. Two _ helices are separated by a loop. Examples: myoblast MyoD1, c myc, Drosophila genes daughterless, hairy, twist, scute, achaete, asense. Not the same as helix turn helix. (18 Nov 1997) |
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| helix-loop-helix motifs | A group of 20-residue peptides characterised by two alpha helices separated by a non-helical segment. These recurring supersecondary structural patterns are found in many sequence-specific DNA-binding proteins. (12 Dec 1998) |
| helix turn helix | <molecular biology> A motif associated with transcription factors, allowing them to bind to and recognise specific DNA sequences. Two amphipathic _ helices are separated by a short sequence with a _ sheet. One helix lies across the major groove of the DNA, while the recognition helix enters the major groove and interacts with specific bases. An example in Drosophila is the homeotic gene fushi tarazu, that binds to the sequence TCAATTAAATGA. Not the same as helix loop helix. (18 Nov 1997) |
| helix-turn-helix motifs | The first DNA-binding protein motif to be recognised. Helix-turn-helix motifs were originally identified in bacterial proteins but have since been found in hundreds of DNA-binding proteins from both eukaryotes and prokaryotes. They are constructed from two alpha helices connected by a short extended chain of amino acids, which constitute the "turn." the two helices are held at a fixed angle, primarily through interactions between the two helices. (12 Dec 1998) |
| Mallory's triple stain | <technique> A method especially suitable for studying connective tissue; sections are stained in acid fuchsin, aniline blue-orange G solution, and phosphotungstic acid; fibrils of collagen are blue, fibroglia, neuroglia, and muscle fibres are red, and fibrils of elastin are pink or yellow. Synonym: Mallory's aniline blue stain, Mallory's triple stain. (05 Mar 2000) |
| Ehrlich's triple stain | <technique> A mixture of indulin, eosin Y, and aurantia. (05 Mar 2000) |
| triple | 1. Consisting of three united; multiplied by three; threefold; as, a triple knot; a triple tie. "By thy triple shape as thou art seen." (Dryden) 2. Three times repeated; treble. See Treble. 3. One of three; third. Triple crown, the crown, or tiara, of the pope. See Tiara. Triple-expansion steam engine, a compound steam engine in which the same steam performs work in three cylinders successively. Triple measure, a measure of tree beats of which first only is accented. <mathematics> Triple ratio, that time in which each measure is divided into three equal parts. Triple valve, in an automatic air brake for railroad cars, the valve under each car, by means of which the brake is controlled by a change of pressure in the air pipe leading from the locomotive. Origin: L. Triplus; tri- (see Tri-) + -plus, as in duplus double: cf. F. Triple. See Double, and cf. Treble. Source: Websters Dictionary (01 Mar 1998) |
| triple bond | A covalent bond resulting from the sharing of three pairs of electrons; e.g., HC≡CH (acetylene). (05 Mar 2000) |
| triple DNA | <molecular biology> A variation of DNA, in which there is a third strand of nucleotides binding to the first two by specific base pairing. (14 Nov 1997) |
| triple phosphate | Magnesium ammonium phosphate, MgNH4PO4, a crude phosphate fertiliser product from phosphate rock and phosphoric acid. Trisodium phosphate, Na3PO4;used to emulsify fats, oil, and grease; an irritant. (05 Mar 2000) |
| triple point | The temperature at which all three phases (i.e., solid, liquid, and gas) are in equilibrium; the triple point of water (273.16 K) is a fundamental fixed point in temperature scales. (05 Mar 2000) |
| triple response | <immunology> The vascular changes in the skin in response to mild mechanical injury, an outward spreading zone of reddening flare) followed rapidly by a weal (swelling) at the site of injury. Redness, heat and swelling, three of the cardinal signs of inflammation, are present. (18 Nov 1997) |
| triple rhythm | A triple cadence to the heart sounds at any heart rate, due to the easy audibility of a third (usually) or fourth heart sound, or at faster rates a summation sound due to coincidence of the third and fourth heart sounds. (05 Mar 2000) |
| triple symptom complex | <syndrome> A multisystem, chronic recurrent disease characterised by ulceration in the mouth and genitalia, iritis, uveitis, arthritis and thrombophlebitis. Often treated with immunosuppressive therapy (corticosteroids, chlorambucil). (27 Sep 1997) |
| triple-tail | <zoology> An edible fish (Lobotes Surinamensis) found in the warmer parts of all the oceans, and common on the southern and middle coasts of the United States. When living it is silvery gray, and becomes brown or blackish when dead. Its dorsal and anal fins are long, and extend back on each side of the tail. It has large silvery scales which are used in the manufacture of fancy work. Synonym:, locally, black perch, grouper, and flasher. Source: Websters Dictionary (01 Mar 1998) |
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