Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Thymine (T)

  • Shin Miyakawa
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1591-3

Definition

Thymine (C5H6N2O2, molecular weight: 126.12) is one of the four nucleic acid bases found in DNA. Thymine has a methyl group (−CH3) at the 5′-position of the pyrimidine ring. In double-stranded DNA, thymine pairs with adenine via Watson-Crick base pairing with two hydrogen bonds. The half-life of thymine in water is 56 years at 100 °C and 20 × 108 years at 0 °C at pH 7. Thymine has a UV absorption maximum at 265 nm and may dimerize when it is irradiated with ultraviolet light.

See Also

Keywords

Molecular Weight Hydrogen Bond Nucleic Acid Absorption Maximum Bioorganic Chemistry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Ribomic IncTokyoJapan