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

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

Authors:	J. Seckbach I.R. Kaplan

Affiliation:	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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