Triple helix

Encyclopedia

In geometry

, a

with the same axis, differing by a translation along the axis. Structures in the form of a triple helix include:

Geometry

Geometry arose as the field of knowledge dealing with spatial relationships. Geometry was one of the two fields of pre-modern mathematics, the other being the study of numbers ....

, a

**triple helix**(plural*triple helices*) is a set of three congruent geometrical helicesHelix

A helix is a type of smooth space curve, i.e. a curve in three-dimensional space. It has the property that the tangent line at any point makes a constant angle with a fixed line called the axis. Examples of helixes are coil springs and the handrails of spiral staircases. A "filled-in" helix – for...

with the same axis, differing by a translation along the axis. Structures in the form of a triple helix include:

- collagen helixCollagen helixIn collagen, the collagen helix, or type-2 helix, is a major shape in secondary structure. It consists of a triple helix made of the repetitious amino acid sequence glycine - X - Y, where X and Y are frequently proline or hydroxyproline....
- peptide nucleic acid (some types, not all)
- triple-stranded DNATriple-stranded DNAA triple-stranded DNA is a structure of DNA in which three oligonucleotides wind around each other and form a triple helix. In this structure, one strand binds to a B-form DNA double helix through Hoogsteen or reversed Hoogsteen hydrogen bonds....