A helix is a shape like a corkscrew or spiral staircase. 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". A "filled-in" helix – for exam… TīmeklisAus einer latinisierten Kombinationsform des griechischen helix (Genitiv helikos) "Spirale" (siehe helix) + pteron "Flügel" (vom PIE-Stammwort *pet- "eilen, fliegen"). Die Idee war, Auftrieb von spiralförmigen Tragflächen zu gewinnen, was jedoch nicht funktionierte. Das Wort wurde von Jules Verne und den Wright-Brüdern verwendet …
Hedera helix CLIMBERS - University of Michigan
Tīmeklis物种 释义 Utricularia helix: 花序单生或2至多个一起或相继出现,通常(至少上部,从侧面看方向向右)螺旋状缠绕 ( Inflorescence solitary or usually 2 or more arising … Tīmeklis2024. gada 24. janv. · The α-helix is a testament to the success of chemical model building. The dimensions and intra-chain H-bonding of this common secondary … stewart clipmaster 510a
helix Etymologie, Herkunft und Bedeutung von helix von …
Tīmeklishelixometer: [noun] a tubular instrument in which an electric light and a prism and lens system enable visual examination of a small-arms bore (as in criminal investigation). TīmeklisAncient Greek (grc) helix. Latin (lat) A kind of ivy. A kind of willow. A whorl, a small ornament on the capital of Corynthian columns. helix. English (eng) (anatomy) The incurved rim of the external ear.. (architecture) A small volute under the abacus of a Corinthian capital.. (mathematics) A curve on the surface of a cylinder or cone such ... Tīmeklishyperbola: [noun] a plane curve generated by a point so moving that the difference of the distances from two fixed points is a constant : a curve formed by the intersection of a double right circular cone with a plane that cuts both halves of the cone. stewart clan tartan plaid