| 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) |
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| 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) |
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| helix |
A spiral, staircase-like structure.
Ãâó: www.pub.ac.za/resources/glossary.html
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| helix |
a winding shape, similar to a spiral; the DNA molecule has a double ?helix shape, which is two helixes twisted around each other.
Ãâó: school.discovery.com/curriculumcenter/genetics/glo...
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| helix |
This is a screw-shaped spiral.
Ãâó: www.satellite-tv-hq.com/telecom-glossary-h.htm
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| helix |
A helix is formed by a polypeptide chain with repeating phi and psi angles. Its geometry is defined by the number of residues per turn, and the rise per residue. In principle the polypeptide chain can form right and left handed helices with a range of pitches.
Ãâó: xray.bmc.uu.se/~kenth/bioinfo/glossary.html
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| helix |
helical: something spiral in form, such as a gastropod shell.
Ãâó: www.sedgwickmuseum.org/education/glossary.html
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