Growth pattern and 13C12C isotope fractionation of Cyanidium caldarium and hot spring algal mats期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Growth pattern and 13C12C isotope fractionation of Cyanidium caldarium and hot spring algal mats

Authors:	J Seckbach IR Kaplan

Institution:	1. Department of Organic Chemistry, The Hebrew University, Jerusalem Israel;2. Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Calif. U.S.A.;3. Department of Geology, University of California, Los Angeles, Calif. U.S.A.

Abstract:	A study was undertaken with the thermophilic green alga Cyanidium caldarium which grows optimally at low pH and high concentrations of CO₂. Carbon-isotope fractionation was not found to be a simple linear function of temperature. Maximum enrichment of ¹²C in cellular material occurred under optimum growth conditions (at approximately pH 2 and at temperatures between 40–50°C in a CO₂ atmosphere). A maximum measured fractionation of ?24‰ may account for low values ( $δ^{13} C < ?30‰_{PDB}$ ) in Precambrian kerogen presumably derived from algal mats.

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