helical knot

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• North Carolina-class battleship — North Carolina steaming on 3 June 1946. By this time, many of the light anti aircraft weapons (Bofors 40 mm and Oerlikon 20 mm) mounted during the war had been removed, while more modern radars had been mounted on her forefunnel and mainmast …   Wikipedia

• Möbius strip — This article is about the mathematical object. For musical group, see Mobius Band (band). A Möbius strip made with a piece of paper and tape. If an ant were to crawl along the length of this strip, it would return to its starting point having… …   Wikipedia

• Protein domain — Pyruvate kinase, a protein from three domains (PDB 1pkn) A protein domain is a part of protein sequence and structure that can evolve, function, and exist independently of the rest of the protein chain. Each domain forms a compact three… …   Wikipedia

• Messier 87 — Virgo A The Messier 87 galaxy. Observation data Epoch J2000 Constellation Virgo Right ascension …   Wikipedia

• Nucleic acid secondary structure — The secondary structure of a nucleic acid molecule refers to the basepairing interactions within a single molecule or set of interacting molecules, and can be represented as a list of bases which are paired in a nucleic acid molecule.[1] The… …   Wikipedia

• Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …   Wikipedia

• Prusik-Knoten — Prusikknoten Typ Klemmknoten Anwendung zuziehende Schlinge Ashley Nr # 1763 …   Deutsch Wikipedia

• Prusikschlinge — Prusikknoten Typ Klemmknoten Anwendung zuziehende Schlinge Ashley Nr # 1763 …   Deutsch Wikipedia

• tangle — A small irregular knot. neurofibrillary t. intraneuronal accumulations of helical filaments that assume twisted contorted patterns; found in cells of the hippocampus and cerebral cortex in individuals with Alzheimer disease. * * * tan·gle taŋ gəl …   Medical dictionary

• Magnetohydrodynamics — For the academic journal, see Magnetohydrodynamics (journal). Magnetohydrodynamics (MHD) (magneto fluid dynamics or hydromagnetics) is an academic discipline which studies the dynamics of electrically conducting fluids. Examples of such fluids… …   Wikipedia

• Narwhal — This article is about the species of whale. For the class of submarine, see Narwhal class submarine. Narwhal [1] …   Wikipedia