Kinetics of sulfate and hydrogen uptake by the thermophilic sulfate-reducing bacteria Thermodesulfobacterium sp. strain JSP and Thermodesulfovibrio sp. strain R1Ha3

Article Abstract:

The half-saturation constants (Km), maximum uptake rates and threshold concentrations for sulfate and hydrogen were measured for two sulfate-reducing bacteria (SRB) strains in an incubation system without headspace. The SRB strains were obtained from microbial mat samples collected from a hot spring in Hveragerdi, Iceland. Strain JSP was isolated from a microbial mat at 75 degrees C while strain R1Ha3 was collected at 55 degrees C. Results indicate that the Km value for the thermophilic SRB strain is similar to constants described for mesophilic SRB isolated from low-sulfate environments.

Physiological aspects, Bacteria, Thermophilic, Sulfur bacteria, Thermophiles

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Influence of pH and temperature on enumeration of cellulose- and hemicellulose-degrading thermophilic anaerobes in neutral and alkaline Icelandic hot springs

Article Abstract:

Chemical and physical factors that affect the growth of native organisms in laboratory culture media are examined by performing ecological studies on biomat samples from Icelandic hot springs. The abundance of xylan-degrading and cellulose-using thermophilic anaerobes as a function of temperature and pH in the hot spring environment was also determined. The most probable number technique is used for enumeration of bacteria in the samples, with media at many different temperatures (37 to 90 degrees centigrade) and two ph values (7 and 9).

Growth, Anaerobic bacteria

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Interspecies electron transfer during propionate and butyrate degradation in mesophilic, granular sludge

Article Abstract:

A study of interspecies formate and hydrogen transfer during anaerobic oxidation of butyrate and propionate hydrogen, formate or hydrogen- and formate shows that electron transfer takes place through interspecies hydrogen transfer and interspecies formate transfer is not necessary for interspecies electron transfer during propionate and butyrate degradation. Oxidation of propionates and butyrate occurs if acetate and hydrogen are reduced at low concentrations.

Analysis, Oxidation-reduction reaction, Oxidation-reduction reactions, Sludge, Propionates

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