Acetogenesis from CO(sub.2) in an anoxic marine sediment
Article Abstract:
Sediments from Cape Lookout Bight, NC, were measured for hydrogen and acetate concentrations in a one-month incubation experiment. Incorporation of (super.14)CO(sub.2) into (super.14)C-acetate and (super.14)CN(sub.4) were measured. Pore-water concentration and radiotracer measurements give evidence for occurrence of aceotogenesis from carbon dioxide in anoxic marine sediments that are usually dominated by methanogenesis and sulfate reduction. Control by acetogenic bacteria is likely reflected in maintenance of elevated, constant, hydrogen concentrations right after sulfate depletion. Probably acetogenic bacteria were the main consumers of hydrogen in that period.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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Production and release of bacterial capsular material and its subsequent utilization by marine bacterioplankton
Article Abstract:
Radiolabeled organic carbon was used to study uptake and release of dissolved organic carbon (DOC) by marine bacterioplankton. The evidence indicates that the capsular material of bacterioplankton is constantly being renewed by release of material into the surrounding water. On uptake, about 55% of the radiolabeled organic carbon was found in intracellular material and 45% in capsular material. P-limited and balanced nutrient conditions were compared, but no significant difference was observed. The bacterial-derived DOC appears to be fairly resistant to bacterial degradation.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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Photochemical transformations of surface and deep marine dissolved organic matter: effects on bacterial growth
Article Abstract:
Bacterial production was reduced by 75% after exposure of surface-water dissolved organic matter (DOM) to sunlight, while an increase of 40% occurred in bacterial production after deep-water DOM was exposed to sunlight. Water samples were collected from eight depths ranging from 15 to 1,000 m in the Gulf of Mexico. Phototransformations appear to be critical in DOM cycling in the ocean.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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