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Appl Environ Microbiol. 1990 February; 56(2): 560-562
Copyright © 1990, American Society for Microbiology. All Rights Reserved.

Kinetics of Sulfur Oxidation at Suboptimal Temperatures

Lasse Ahonen and Olli H. Tuovinen^*

¹ Department of Microbiology, University of Helsinki, SF-00710 Helsinki, Finland, and Department of Microbiology, The Ohio State University, 484 W. 12th Avenue, Columbus, Ohio 43210-1292²

ABSTRACT

Chemolithoautotrophic bacteria were enriched from mine water at incubation temperatures ranging from 4 to 46°C, using elemental sulfur as a substrate in acid mineral salts media. Thiobacillus-type bacteria were successfully enriched for at all test temperatures except 46°C. Changes in pH (–dpH/dt) were used to estimate the rate constants for the enrichment cultures. The rate constants yielded a linear Arrhenius plot, an activation energy of 65 kJ/mol, and a temperature coefficient (Q₁₀) of 2.1 for the 4 to 37°C temperature interval.

^* Corresponding author.

Present address: Geological Survey of Finland, SF-02150 Espoo, Finland.