This article is about the shape. For the shape of deoxyribonucleic acid, see Double helix. For other uses, see Helix (disambiguation).
(l-r) Tension, compression and torsion coil springsA machine screwThe right-handed helix (cos t, sin t, t) for 0 ≤ t ≤ 4π with arrowheads showing direction of increasing t
A helix (/ˈhiːlɪks/; pl. helices) is a shape like the cylindrical part of a coil spring or machine screw. It is a type of smooth space curve with tangent lines at a constant angle to a fixed axis. 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".[1]
A "filled-in" helix – for example, a "spiral" (helical) ramp – is a surface called a helicoid.[2]
^ἕλιξ Archived 2012-10-16 at the Wayback Machine, Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus
A helix (/ˈhiːlɪks/; pl. helices) is a shape like the cylindrical part of a coil spring or machine screw. It is a type of smooth space curve with tangent...
An alpha helix (or α-helix) is a sequence of amino acids in a protein that are twisted into a coil (a helix). The alpha helix is the most common structural...
Hedera helix, the common ivy, European ivy, or just ivy, is a species of flowering plant in the family Araliaceae. It is native to most of Europe and...
In molecular biology, the collagen triple helix or type-2 helix is the main secondary structure of various types of fibrous collagen, including type I...
Helix Studios is an American gay pornographic film studio. Founded in 2002 by Keith Miller and based in Las Vegas, Nevada, it primarily features twink...
Helix pomatia, common names are the Roman snail, Burgundy snail, or escargot, is a species of large, air-breathing stylommatophoran land snail native...
In mechanical engineering, a helix angle is the angle between any helix and an axial line on its right, circular cylinder or cone. Common applications...
Helix School is a public high school in Helix, Oregon, United States. In 2008, 91% of the school's seniors received a high school diploma. Of 11 students...
The Helix Nebula (also known as NGC 7293 or Caldwell 63) is a planetary nebula (PN) located in the constellation Aquarius. Discovered by Karl Ludwig Harding...
In molecular biology, the term double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA. The double helical...
to Perforce Helix, which now supported distributed development and included security features allowing suspicious usage tracking. Helix's security capabilities...
In the fields of geometry and biochemistry, a triple helix (pl.: triple helices) is a set of three congruent geometrical helices with the same axis, differing...
innovation helix framework describes university-industry-government-public-environment interactions within a knowledge economy. In innovation helix framework...
The Helix Bridge, officially The Helix, and previously known as the Double Helix Bridge, is a pedestrian bridge linking Marina Centre with Marina South...
310 helix is a type of secondary structure found in proteins and polypeptides. Of the numerous protein secondary structures present, the 310-helix is the...
The triple helix model of innovation refers to a set of interactions between academia (the university), industry and government, to foster economic and...
Cornu aspersum (syn. Helix aspersa, Cryptomphalus aspersus), known by the common name garden snail, is a species of land snail in the family Helicidae...
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