Microbial characterization of thermophilicArchaea isolated from the Guaymas Basin hydrothermal vent |
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| Authors: | Canganella Francesco Jack Jones W |
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| Institution: | (1) Present address: Department of Agrobiology and Agrochemistry, University of Tuscia, Viterbo, Italy;(2) Environmental Research Laboratory, US Environmental Protection Agency, 960 College Station Rd., 30605 Athens, GA, USA;(3) School of Applied Biology, Georgia Institute of Technology, Atlanta, Georgia, USA |
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| Abstract: | Extremely thermophilic bacteria were isolated from sediments collected at the Guaymas Basin hydrothermal vent located in the Gulf of California. One isolate, (FC89) is a hydrogenotrophic methanogen with an optimal growth temperature of 85°C; this isolate appears to be closely related to the previously describedMethanococcus jannaschii. Thermophilic isolates TY and TYS are heterotrophic, sulfur-reducing archaea that differ from other thermophilic heterotrophic strains in physiological and molecular properties. Both heterotrophic isolates fermented carbohydrates and proteinaceous substrates; acetate was the primary product of carbohydrate fermentation, whereas acetate and a mix of organic acids were primary products of proteinaceous substrate fermentation. A detailed microbiological characterization of the isolates and a profile of fermentable substrates and fermentation products are described. |
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