Helix

A helix (pl: helixes or helices) 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 example, a spiral ramp – is called a helicoid. Helices are important in biology, as the DNA molecule is formed as two intertwined helices, and many proteins have helical substructures, known as alpha helices. The word helix comes from the Greek word ἕλιξ, "twisted, curved".

Read more about Helix:  Types, Mathematical Description, Examples

Other articles related to "helix":

S100 Calcium-binding Protein A1 - Conformational Change
... Upon binding calcium, helix 3 of S100A1 (and most other S100 proteins as well) re-orients from being relatively antiparallel to helix 4 to being roughly perpendicular ... change is different from most EF-hands, in that the entering helix, and not the exiting helix, moves ... This conformational change exposes a large hydrophobic pocket between helix 3, 4, and the 'hinge' region of S100A1 that is involved in virtually all calcium-dependent target protein interactions ...
Love Dart - Species Variability - Images - Helicidae
... planospira Eobania vermiculata Helicigona lapicida Helix aperta = Cantareus apertus Helix aspersa = Cantareus aspersus Helix lucorum Helix lutescens Helix pomatia and many other works ...
List Of DC Comics Imprint Publications - Helix
... Helix was short-lived science fiction imprint in the style of Vertigo ... Title Series Issues Dates Notes The Black Lamb #1 - 6 November 1996 – April 1997 Bloody Mary #1 - 4 October 1996 – January 1997 Bloody Mary Lady Liberty #1 - 4 September 1997 – December 1997 BrainBanx #1 - 6 March 1997 – August 1997 Cyberella #1 - 12 September 1996 – August 1997 Dead Corps #1 - 4 September 1998 – December 1998 The Dome Ground Zero #1 1998 Gemini Blood #1 - 9 September 1996 – May 1997 Michael Moorcock's Multiverse #1 - 12 November 1997 – October 1998 Sheva's War #1 - 5 October 1998 – February 1999 Star Crossed #1 - 3 June – August 1997 Time Breakers #1 - 5 January – May 1997 Transmetropolitan #1 - 12 September 1997 – August 1998 Moved to Vertigo Vermillion #1 - 12 October 1996 – September 1997 ...
Stockholm Format - Recommended Features - Notes
... The protein SS letters are taken from DSSP H=alpha-helix, G=3/10-helix, I=p-helix, E=extended strand, B=residue in isolated b-bridge, T=turn, S=bend, C=coil/loo ...