Acetylene reduction and hydrogen metabolism by a cyanobacterial/sulfate‐reducing bacterial mat ecosystem
| Autor: | Geoffrey D. Smith, Ronald M. Lynch, Graham W. Skyring |
|---|---|
| Rok vydání: | 1988 |
| Předmět: |
Cyanobacteria
education.field_of_study biology Population Nitrogenase chemistry.chemical_element Metabolism biology.organism_classification Microbiology Sulfur chemistry.chemical_compound chemistry Environmental chemistry Botany Earth and Planetary Sciences (miscellaneous) Nitrogen fixation Environmental Chemistry Sulfate education Bacteria General Environmental Science |
| Zdroj: | Geomicrobiology Journal. 6:25-31 |
| ISSN: | 1521-0529 0149-0451 |
| Popis: | We report a study of nitrogenase activity (acetylene reduction) and hydrogen gas metabolism in intact smooth cyanobacterial mats from Hamelin Pool, Shark Bay, Western Australia. The predominant cyanobacterial population in these mats is Microcoleus chthonoplastes. The mats had a significant capacity for nitrogen fixation, predominantly attributable to the photosyn‐thetic component. By physical and chemical perturbation we revealed an active hydrogen metabolism within the mats. Most of the H2 formation was attributed to fermentative processes, whereas hydrogen was consumed in light‐dependent, together with oxygen‐ and sulfate‐dependent respiratory processes. It was concluded that H2 formed by fermentative bacteria in the dark drives a significant proportion of sulfate reduction in the mats, but there was little H2 transfer from the cyanobacteria to the sulfate‐reducing bacteria. Thus photosynthetically produced H2 gas is unlikely to significantly alter the previously measured carbon: sulfur ratio ... |
| Databáze: | OpenAIRE |
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