| 翻訳と辞書 |
TEX86
TEX86 is an organic paleothermometer based upon the membrane lipids of mesophilic marine Thaumarchaeota (formerly Marine Group 1 Crenarchaeota).〔Schouten, S., Hopmans, E.C., Schefus, E., and Sinninghe Damste. (2002) Distributional variation in marine crenarchaeotal membrane lipids: a new tool for reconstructing ancient sea water temperatures?. ''Earth and Planetary Science Letters'', 204, 265.〕〔Kim, J.-H., S. Schouten, E. C. Hopmans, B. Donner, J. S. Sinninghe Damsté. (2008) Global sediment core-top calibration of the TEX86 paleothermometer in the ocean. ''Geochimica et Cosmochimica Acta'', 72, 1154.〕
==Basics==
The membrane lipids of Thaumarchaeota are composed of glycerol dialkyl glycerol tetraethers (GDGTs) which contain 0-3 cyclopentane moieties. Thaumarchaeota also synthesise crenarchaeol which contains four cyclopentane moieties and a single cyclohexane moiety and a regio-isomer. The cyclohexane and cyclopentane rings, formed by internal cyclisation of one of the biphytane chains,〔Schouten, S., Hopmans, E. C., and Sinninghe Damsté, J. S., 2013, The organic geochemistry of glycerol dialkyl glycerol tetraether lipids: A review: Organic Geochemistry, v. 54, no. 0, p. 19-61.〕 have a pronounced effect on the thermal transition points of the Thaumarchaeotal cell membrane. Mesocosm studies demonstrate that the degree of cyclisation is generally governed by growth temperature 〔Wuchter, C., Schouten, S., Coolen, M. J. L., and Sinninghe Damsté, J. S., 2004, Temperature-dependent variation in the distribution of tetraether membrane lipids of marine Crenarchaeota: Implications for TEX86 paleothermometry: Paleoceanography, v. 19, no. 4, p. PA4028〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「TEX86」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|