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 MiyakawaEmail author
Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_1591-3


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


Molecular Weight Hydrogen Bond Nucleic Acid Absorption Maximum Bioorganic Chemistry 
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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Ribomic IncTokyoJapan