| HPA | Health Care Practice Act; Health Policy Agenda for the American People; health promotion advocates; ... |
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| HPH | Helix pomatia hemocyanin |
| helix (snails) | A genus of chiefly eurasian and african land snails including the principal edible snails as well as several pests of cultivated plants. (12 Dec 1998) |
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| smaller muscle of helix | <anatomy> A band of oblique fibres covering the crus of the helix of the auricle. Synonym: musculus helicis minor, smaller muscle of helix. (05 Mar 2000) |
| spine of helix | An anteriorly directed spine at the extremity of the crus of the helix of the auricle. Synonym: spina helicis, apophysis helicis. (05 Mar 2000) |
| DNA helix | The helical structure assumed by two strands of deoxyribonucleic acid, held together throughout their length by hydrogen bonds between bases on opposite strands, referred to as Watson-Crick base pairing. See: base pair. Synonym: DNA helix, double helix, twin helix. (05 Mar 2000) |
| double helix | <molecular biology> Conformation or shape that two linear strands of DNA assume when bonded together and become twisted into a helix. (10 Nov 1998) |
| triple helix | The superhelix formed (right-handed) from three individual collagen helices (each being left-handed). (05 Mar 2000) |
| twin helix | The helical structure assumed by two strands of deoxyribonucleic acid, held together throughout their length by hydrogen bonds between bases on opposite strands, referred to as Watson-Crick base pairing. See: base pair. Synonym: DNA helix, double helix, twin helix. (05 Mar 2000) |
| 3.613 helix | The helical (commonly right-handed) form present in many proteins, deduced by Pauling and Corey from X-ray diffraction studies of proteins such as alpha-keratin; the helix is stabilised by hydrogen bonds between, e.g., ==C==O and HN== groups (symbolised by the centre dot in ==CO-HN==) of different eupeptide bonds. In a true a helix, there are 3.6 amino acid residues per turn of the helix. Synonym: 3.613 helix, Pauling-Corey helix. Collagen helix, an extended left-handed helix resulting from the high levels of glycine, l-proline, and l-hydroxyproline present in the collagens. There are 3.3 amino acids per turn of the helix. Three of those left-handed helices form a triple superhelix that is right-handed. (05 Mar 2000) |
| large muscle of helix | <anatomy> A narrow band of muscular fibres on the anterior border of the helix of the auricle arising from the spine and inserted at the point where the helix becomes transverse. Synonym: musculus helicis major, large muscle of helix. (05 Mar 2000) |
| fossa of helix | 1. The longitudinal furrow between the helix and the antihelix of the auricle. Synonym: fossa of helix, scaphoid fossa. 2. Obsolete term for scaphoid fossa. Origin: L. Fr. G. Skaphe, skiff (05 Mar 2000) |
| limb of helix | A transverse ridge continuing backward from the helix of the auricle, dividing the concha into an upper portion (cymba) and a lower portion (cavity of concha). Synonym: crus helicis, crista helicis, limb of helix. (05 Mar 2000) |
| artery of the pancreatic tail | Origin, splenic artery near the left gastroepiploic; distribution, the tail of the pancreas; anastomoses, with other pancreatic arteries. Synonym: arteria caudae pancreatis, caudal pancreatic artery. (05 Mar 2000) |
| boat-tail | <zoology> A large grackle or blackbird (Quiscalus major), found in the Southern United States. Source: Websters Dictionary (01 Mar 1998) |
| rat-tail | 1. <veterinary> An excrescence growing from the pastern to the middle of the shank of a horse. 2. <zoology> The California chimaera. See Chimaera. Any fish of the genus Macrurus. See Grenadier. Source: Websters Dictionary (01 Mar 1998) |
| mare's-tail | 1. A long streaky cloud, spreading out like a horse's tail, and believed to indicate rain; a cirrus cloud. See Cloud. "Mackerel sky and mare's-tails Make tall ships carry low sails." (Old Rhyme) 2. <botany> An aquatic plant of the genus Hippuris (H.vulgaris), having narrow leaves in whorls. Source: Websters Dictionary (01 Mar 1998) |