Ronald Oremland (Former Employee)
Science and Products
Filter Total Items: 120
Big Soda Lake (Nevada). 1. Pelagic bacterial heterotrophy and biomass Big Soda Lake (Nevada). 1. Pelagic bacterial heterotrophy and biomass
Bacterial activities and abundance were measured seasonally in the water column of meromictic Big Soda Lake which is divided into three chemically distinct zones: aerobic mixolimnion, anaerobic mixolimnion, and anaerobic monimolimnion. Bacterial abundance ranged between 5 and 52 x 106 cells ml−1, with highest biomass at the interfaces between these zones: 2–4 mg C liter−1 in the...
Authors
Jon P. Zehr, Ronald W. Harvey, Ronald S. Oremland, James E. Cloern, Leah H. George, Judith L. Lane
Formation of methane and carbon dioxide from dimethylselenide in anoxic sediments and by a methanogenic bacterium Formation of methane and carbon dioxide from dimethylselenide in anoxic sediments and by a methanogenic bacterium
Anaerobic San Francisco Bay salt marsh sediments rapidly metabolized [14C]dimethylselenide (DMSe) to 14CH4 and 14CO2. Addition of selective inhibitors (2-bromoethanesulfonic acid or molybdate) to these sediments indicated that both methanogenic and sulfate-respiring bacteria could degrade DMSe to gaseous products. However, sediments taken from the selenium-contaminated Kesterson Wildlife...
Authors
Ronald S. Oremland, Jon P. Zehr
Metabolism of reduced methylated sulfur compounds in anaerobic sediments and by a pure culture of an estuarine methanogen Metabolism of reduced methylated sulfur compounds in anaerobic sediments and by a pure culture of an estuarine methanogen
Addition of dimethylsulfide (DMS), dimethyldisulfide (DMDS), or methane thiol (MSH) to a diversity of anoxic aquatic sediments (e.g., fresh water, estuarine, alkaline/hypersaline) stimulated methane production. The yield of methane recovered from DMS was often 52 to 63%, although high concentrations of DMS (as well as MSH and DMDS) inhibited methanogenesis in some types of sediments...
Authors
R.P. Kiene, Ronald S. Oremland, Anthony Catena, Laurence G. Miller, D.G. Capone
Measurement of nitrous oxide reductase activity in aquatic sediments Measurement of nitrous oxide reductase activity in aquatic sediments
Denitrification in aquatic sediments was measured by an N2O reductase assay. Sediments consumed small added quantities of N2O over short periods (a few hours). In experiments with sediment slurries, N2O reductase activity was inhibited by O2, C2H2, heat treatment, and by high levels of nitrate (1 mM) or sulfide (10 mM). However, ambient levels of nitrate (
Authors
L.G. Miller, Ronald S. Oremland, S. Paulsen
Aspects of the biogeochemistry of Big Soda Lake, Nevada Aspects of the biogeochemistry of Big Soda Lake, Nevada
No abstract available.
Authors
Ronald S. Oremland, R. L. Smith, Charles W. Culbertson
Isolation of anaerobic oxalate-degrading bacteria from freshwater lake sediments Isolation of anaerobic oxalate-degrading bacteria from freshwater lake sediments
Enrichment cultures that anaerobically degraded oxalate were obtained from lake sediment inocula. From these, 5 pure cultures of anaerobic oxalate-degrading bacteria were isolated and partially characterized. The isolates were Gram-negative, non-sporeforming, non-motile, obligate anaerobes. Oxalate was required for growth and was stoichiometrically converted to formate; 14CO2 was also...
Authors
R. L. Smith, F.E. Strohmaier, Ronald S. Oremland
Science and Products
Filter Total Items: 120
Big Soda Lake (Nevada). 1. Pelagic bacterial heterotrophy and biomass Big Soda Lake (Nevada). 1. Pelagic bacterial heterotrophy and biomass
Bacterial activities and abundance were measured seasonally in the water column of meromictic Big Soda Lake which is divided into three chemically distinct zones: aerobic mixolimnion, anaerobic mixolimnion, and anaerobic monimolimnion. Bacterial abundance ranged between 5 and 52 x 106 cells ml−1, with highest biomass at the interfaces between these zones: 2–4 mg C liter−1 in the...
Authors
Jon P. Zehr, Ronald W. Harvey, Ronald S. Oremland, James E. Cloern, Leah H. George, Judith L. Lane
Formation of methane and carbon dioxide from dimethylselenide in anoxic sediments and by a methanogenic bacterium Formation of methane and carbon dioxide from dimethylselenide in anoxic sediments and by a methanogenic bacterium
Anaerobic San Francisco Bay salt marsh sediments rapidly metabolized [14C]dimethylselenide (DMSe) to 14CH4 and 14CO2. Addition of selective inhibitors (2-bromoethanesulfonic acid or molybdate) to these sediments indicated that both methanogenic and sulfate-respiring bacteria could degrade DMSe to gaseous products. However, sediments taken from the selenium-contaminated Kesterson Wildlife...
Authors
Ronald S. Oremland, Jon P. Zehr
Metabolism of reduced methylated sulfur compounds in anaerobic sediments and by a pure culture of an estuarine methanogen Metabolism of reduced methylated sulfur compounds in anaerobic sediments and by a pure culture of an estuarine methanogen
Addition of dimethylsulfide (DMS), dimethyldisulfide (DMDS), or methane thiol (MSH) to a diversity of anoxic aquatic sediments (e.g., fresh water, estuarine, alkaline/hypersaline) stimulated methane production. The yield of methane recovered from DMS was often 52 to 63%, although high concentrations of DMS (as well as MSH and DMDS) inhibited methanogenesis in some types of sediments...
Authors
R.P. Kiene, Ronald S. Oremland, Anthony Catena, Laurence G. Miller, D.G. Capone
Measurement of nitrous oxide reductase activity in aquatic sediments Measurement of nitrous oxide reductase activity in aquatic sediments
Denitrification in aquatic sediments was measured by an N2O reductase assay. Sediments consumed small added quantities of N2O over short periods (a few hours). In experiments with sediment slurries, N2O reductase activity was inhibited by O2, C2H2, heat treatment, and by high levels of nitrate (1 mM) or sulfide (10 mM). However, ambient levels of nitrate (
Authors
L.G. Miller, Ronald S. Oremland, S. Paulsen
Aspects of the biogeochemistry of Big Soda Lake, Nevada Aspects of the biogeochemistry of Big Soda Lake, Nevada
No abstract available.
Authors
Ronald S. Oremland, R. L. Smith, Charles W. Culbertson
Isolation of anaerobic oxalate-degrading bacteria from freshwater lake sediments Isolation of anaerobic oxalate-degrading bacteria from freshwater lake sediments
Enrichment cultures that anaerobically degraded oxalate were obtained from lake sediment inocula. From these, 5 pure cultures of anaerobic oxalate-degrading bacteria were isolated and partially characterized. The isolates were Gram-negative, non-sporeforming, non-motile, obligate anaerobes. Oxalate was required for growth and was stoichiometrically converted to formate; 14CO2 was also...
Authors
R. L. Smith, F.E. Strohmaier, Ronald S. Oremland