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What (who) is G-quadruplex - definition
G-quadruplex
SECONDARY STRUCTURES FORMED IN NUCLEIC ACIDS BY SEQUENCES THAT ARE RICH IN GUANINE
G quadruplex; Quadruple-stranded DNA; G-quadruplexes; Guanine quartet
In molecular biology, G-quadruplex secondary structures (G4) are formed in nucleic acids by sequences that are rich in guanine. They are helical in shape and contain guanine tetrads that can form from one, two or four strands.
Quadruplex videotape
![Ampex VR2000 Amtec, Colortec and Procamp at DC Video, [http://www.dcvideo.com/],](https://commons.wikimedia.org/wiki/Special:FilePath/Ampex-Am-Tech-Color-Tech-Proc-Amp.jpg?width=200 "Ampex VR2000 Amtec, Colortec and Procamp at DC Video, [http://www.dcvideo.com/],")
FIRST PRACTICAL AND COMMERCIALLY SUCCESSFUL ANALOG RECORDING VIDEO TAPE FORMAT
2" quad; 2" Quadruplex; 2" Quad videotape; 2" quad videotape; 2" Quadruplex videotape; 2″ Quad; 2" quadruplex; Quadraplex; 2 inch Quadruplex videotape; 2" Quad; 2'' Quad; Two-inch quad; 2-inch quad; 2-inch Quadruplex videotape; 2-inch quadruplex videotape
2-inch quadruplex videotape (also called 2″ quad video tape or quadraplex) was the first practical and commercially successful analog recording video tape format. It was developed and released for the broadcast television industry in 1956 by Ampex, an American company based in Redwood City, California.
Quadruplex
WIKIMEDIA DISAMBIGUATION PAGE
Quadruplex (disambiguation)
·adj Fourfold; folded or doubled twice.
