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Tetra, a genus of mites in the family Eriophyidae; Tetra (monkey), a rhesus macaque that was the first successfully birthed primate created via an artificial cloning technique; Tetra (unit), a proposed unit of information by Donald Knuth denoting 32 bits; Mitsubishi TETRA, a concept car first exhibited in 1997
TETRA was specifically designed for use by government agencies, emergency services, (police forces, fire departments, ambulance) for public safety networks, rail transport staff for train radios, transport services and the military. [3] TETRA is the European version of trunked radio, similar to Project 25.
In 1978, Günther Maier prepared tetra-tert-butyl-tetrahedrane. [1]The bulky tert-butyl (t-Bu) substituents envelop the tetrahedrane core.Maier suggested that bonds in the core are prevented from breaking because this would force the substituents closer together (corset effect) resulting in Van der Waals strain.
Modified GRF (1-29) often abbreviated as mod GRF (1-29), originally known as tetrasubstituted GRF (1-29), is a term used to identify a 29 amino acid peptide analogue of growth-hormone-releasing hormone (GHRH), a releasing hormone of growth hormone (GH).
Several tetraquark candidates have been reported by particle physics experiments in the 21st century. The quark contents of these states are almost all q q Q Q, where q represents a light (up, down or strange) quark, Q represents a heavy (charm or bottom) quark, and antiquarks are denoted with an overline.
Marching tetrahedra computes up to nineteen edge intersections per cube, where marching cubes only requires twelve. Only one of these intersections cannot be shared with an adjacent cube (the one on the main diagonal), but sharing on all faces of the cube complicates the algorithm and increases memory requirements considerably.