alpha helix

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alpha helix

[′al·fə ′hē·liks]
(cell and molecular biology)
A spatial configuration of the polypeptide chains of proteins in which the chain assumes a helical form, 0.54 nanometer in pitch, 3.6 amino acids per turn, presenting the appearance of a hollow cylinder with radiating side groups.
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References in periodicals archive ?
There, parallel strands that would normally lie in a flat sheet instead curl into a helix.
The Helix Media Delivery Platform includes encoding, management, delivery and playback along with a Helix Client SDK which simplifies media publishing across platforms.
Physicists in Italy and the United States have demonstrated that the best strategy for packing a string into the least space is to coil it into a helix.