Fermentation studies with thermophilicArchaea in pure culture and in syntrophy with a thermophilic methanogen |
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Authors: | Canganella Francesco Jones W Jack |
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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: | Two heterotrophic, thermophilic, sulfur-reducing archaea were isolated from the Guaymas Basin hydrothermal vent. The fermentation of proteinaceous and carbohydrate substrates was examined at 85°C for each isolate in the presence and absence of elemental sulfur and in coculture with a thermophilic methanogen. The heterotrophic isolates differed with respect to their requirement for sulfur. Both heterotrophic isolates exhibited a mixed organic acid fermentation from proteinaceous substrates; however, acetate was the sole organic acid produced from carbohydrate fermentation. In coculture fermentations with a thermophilic methanogen, the heterotrophic isolates exhibited enhanced growth and fermentation. Interspecies hydrogen transfer and elemental sulfur-reduction may be important microbial processes in deep-sea hydrothermal vent community metabolism. |
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