Well-known species include Helix pomatia (Roman snail, Burgundy snail, or edible snail) and Helix lucorum (Turkish snail). Like most land snails, Helix species are hermaphroditic, and like other helicids, a courting pair will impale each other with hormone-rich love darts prior to exchanging sperm. Members of the genus first appeared during the Oligocene. They are the type genus of the family Helicidae, and are among the first animal genera described by Carl Linnaeus. I prefer a Quad helix, which is kind of spring loaded and the parent doesn't have to do anything.Ī helix is a three-dimensional spiral, like the shape of a spring or the railing on a spiral staircase.Įach twist of the helix is a mere 70 billionths of a meter in length and approximately 10 in diameter.Ī third subunit, H, without active groups and located on the membrane inner surface, is anchored to the membrane by a protein helix.Helix is a genus of large, air-breathing land snails native to Europe and the Mediterranean region. – 'Zippers' are conceptually at work in the DNA double helix, which is "unzipped" for replication and transcription In that case the far end of the helix was the Ice Age, and we are now moving towards the center of the helix in which case everything warms up.ĬNN Poll: Skepticism on global warming heating up? The Nobel Prize in Physiology or Medicine 1978 - Presentation Speech The double helix is then untwisted and forms two single strands which can be duplicated with the help of the enzyme DNA polymerase.Īt these locations the DNA- helix is severed: the pages of the book are separated. noun type genus of the family HelicidaeĮven the double helix is a sort of spell-checker, for editorial enzymes can compare one DNA base with its opposite and undamaged number to check that it fits.
#Helix definition series#
/dna_helix-645381867-58a0b2cf5f9b58819cf7becd.jpg "helix definition")
noun anatomy The incurved rim of the external ear.įrom WordNet 3.0 Copyright 2006 by Princeton University.
noun architecture A small volute under the abacus of a Corinthian capital.noun mathematics A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant the three-dimensional curve seen in a screw or a spiral staircase.noun (Zoöl.) A genus of land snails, including a large number of species.įrom Wiktionary, Creative Commons Attribution/Share-Alike License.noun (Anat.) The incurved margin or rim of the external ear.noun (Arch.) A caulicule or little volute under the abacus of the Corinthian capital.It is distinguished from the spiral, all the convolutions of which are in the plane. The common helix is the curve formed by the thread of the ordinary screw. noun (Geom.) A nonplane curve whose tangents are all equally inclined to a given plane.noun In conchology, the representative genus of Helicidæ and Helicinæ.įrom the GNU version of the Collaborative International Dictionary of English.noun In anatomy: The prominent curved fold which forms most of the rim or margin of the outer ear.noun In electricity, a coil of wire, as that surrounding the core of an electromagnet.noun In architecture, any spiral, particularly a small volute or twist under the abacus of the Corinthian capital also, a volute of the Ionic capital.noun A spiral line, as of wire in a coil a winding, or something that is spiral a circumvolution specifically, in geometry, the curve assumed by a right line drawn on a plane when that plane is wrapped round a cylindrical surface of any kind, especially a right cylinder, as the curve of a screw-thread also, a curve on any developable surface which becomes a right “line when the surface is developed into a plane, as a conical helix.intransitive verb To move along a helical course spiral.intransitive verb To have the shape of a helix.intransitive verb To move or position (something) into the shape of a helix.noun Architecture A volute on a Corinthian or Ionic capital.
#Helix definition skin#
noun Anatomy The folded rim of skin and cartilage around most of the outer ear.noun Mathematics A three-dimensional curve that lies on a cylinder or cone, so that its angle to a plane perpendicular to the axis is constant.
From The American Heritage® Dictionary of the English Language, 5th Edition.
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