EFFECT OF HYDROGEN LIMITATION AND TEMPERATURE ON THE FRACTIONATION OF SULFUR ISOTOPES BY A DEEP-SEA HYDROTHERMAL VENT SULFATE-REDUCING BACTERIUM
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dc.contributor.author | Hoek J. | |
dc.contributor.author | Reysenbach A.L. | |
dc.contributor.author | Habicht K.S. | |
dc.contributor.author | Canfield D.E. | |
dc.date.accessioned | 2024-04-20T09:00:48Z | |
dc.date.available | 2024-04-20T09:00:48Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=12091593 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2006, 70, 23 SPEC. ISS., 5831-5841 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/43730 | |
dc.description.abstract | The fractionation of sulfur isotopes by the thermophilic chemolithoautotrophic Thermodesulfatator indicus was explored during sulfate reduction under excess and reduced hydrogen supply, and the full temperature range of growth (40-80 °C). Fractionation of sulfur isotopes measured under reduced H2 conditions in a fed-batch culture revealed high fractionations (24-37?) compared to fractionations produced under excess H2 supply (1-6?). Higher fractionations correlated with lower sulfate reduction rates. Such high fractionations have never been reported for growth on H2. For temperature-dependant fractionation experiments cell-specific rates of sulfate reduction increased with increasing temperatures to 70 °C after which sulfate-reduction rates rapidly decreased. Fractionations were relatively high at 40 °C and decreased with increasing temperature from 40-60 °C. Above 60 °C, fractionation trends switched and increased again with increasing temperatures. These temperature-dependant fractionation trends have not previously been reported for growth on H2 and are not predicted by a generally accepted fractionation model for sulfate reduction, where fractionations are controlled as a function of temperature, by the balance of the exchange of sulfate across the cell membrane, and enzymatic reduction rates of sulfate. Our results are reproduced with a model where fractionation is controlled by differences in the temperature response of enzyme reaction rates and the exchange of sulfate in and out of the cell. | |
dc.subject | ENZYME ACTIVITY | |
dc.subject | HYDROGEN SULFIDE | |
dc.subject | HYDROTHERMAL VENT | |
dc.subject | ISOTOPIC FRACTIONATION | |
dc.subject | REDUCTION | |
dc.subject | SULFATE-REDUCING BACTERIUM | |
dc.subject | SULFUR ISOTOPE | |
dc.subject | TEMPERATURE EFFECT | |
dc.subject | THERMOPHILIC BACTERIUM | |
dc.subject | BACTERIA (MICROORGANISMS) | |
dc.subject | THERMODESULFATATOR INDICUS | |
dc.title | EFFECT OF HYDROGEN LIMITATION AND TEMPERATURE ON THE FRACTIONATION OF SULFUR ISOTOPES BY A DEEP-SEA HYDROTHERMAL VENT SULFATE-REDUCING BACTERIUM | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2006.07.031 |
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