A helix (pl: helices), from the Greek word έλικας/έλιξ, is a twisted shape like a spring, screw or a spiral (correctly termed helical) staircase. Helices are important in biology, as DNA is helical and many proteins have helical substructures, known as alpha helices.
Wolfram Research Double helix Alpha helix DNA Octave equivalency Seashell surface A-DNA Helicoid Z-DNA Pitch space Torsion of curves Cylindrical coordinate system Spiral (railway) Differential geometry of curves Jean-Marie Lehn Chirality (mathematics) Circle of fifths Translation (geometry) Euler's formula Spiral Parameter Curvature Screw Spring (device) Cartesian coordinate system Rotation Collagen Dimension Pi Protein Biology Music Greek language Mathematics
