Medical Definition of A helix

1. 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)

Lexicographical Neighbors of A Helix

a fortiori
a friend in need is a friend indeed
a gentleman and a scholar
a go-go
a golden key can open any door
a good beginning makes a good ending
a good deal
a good deed is its own reward
a good man is hard to find
a good voice to beg bacon
a granules
a great deal
a haemolysin
a hair's breadth
a helix (current term)
a house divided against itself cannot stand
a house is not a home
a hundred
a hundred and one
a hundred and ten percent
a hundred thousand
a hundred times
a into g
a journey of a thousand miles begins with a single step
a la
a la carte
a la minute
a la mode
a la mode(p)

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