Ronald Oremland (Former Employee)
Science and Products
Filter Total Items: 119
Radiotracer studies of bacterial methanogenesis in sediments from the Dead Sea and Solar Lake (Sinai)
No abstract available.
Authors
Mark Marvin-DePasquale, Yoram. Geological Survey (U.S.) Cohen, Ronald S. Oremland, A. Oren
Bacterial methylmercury degradation in Florida Everglades peat sediment
Methylmercury (MeHg) degradation was investigated along an eutrophication gradient in the Florida Everglades by quantifying 14CH4 and 14CO2 production after incubation of anaerobic sediments with [14C]MeHg. Degradation rate constants (k) were consistently ≤0.1 d-1 and decreased with sediment depth. Higher k values were observed when shorter incubation times and lower MeHg amendment levels were use
Authors
M. C. Marvin-DiPasquale, R.S. Oremland
Dimethylsulfoniopropionate as a potential methanogenic substrate in Mono Lake sediments
A high concentration of dimethylsulfoniopropionate (DMSP) was found in the water column (0.1–1.8 µM particulate plus dissolved) of Mono Lake, CA, an alkaline, hypersaline waterbody. The dense Artemia monica population contained high levels of DMSP (1.7–2.5 mmol.g-1 wet weight), presumably as an osmolyte. Death of these brine shrimp caused accumulation of DMSP along the shoreline of the lake, where
Authors
P.T. Visscher, J.R. Guidetti, Charles W. Culbertson, Ronald S. Oremland
Microbial cycling of methyl bromide
Environmental concern about brominated halocarbons like methyl bromide (MeBr) is focused on their potential to destroy stratospheric ozone. Photocatalysis of MeBr and other halocarbons in the stratosphere results in the liberation of reactive CI and Br atoms. Because Br atoms are perhaps as much as 100-fold more efficient at attacking ozone than are CI atoms, bromine’s lower abundance is partly co
Authors
Ronald S. Oremland
Methanolobus taylorii sp nov, a new methylotropic, estuarine methanogen
Previously published phylogenetic studies of 16S rRNA showed that methylotrophic, slightly halophilic, methanogenic strain GS-16T (T = type strain) represents a new species of bacterium. We propose the name Methanolobus taylorii for this species; strain GS-16 is the type strain.
Authors
Ronald S. Oremland, David R. Boone
Biogeochemical transformations of selenium in anoxic environments
No abstract available.
Authors
Ronald S. Oremland
Isolation, growth, and metabolism of an obligately anaerobic, selenate- respiring bacterium, strain SES-3
A gram-negative, strictly anaerobic, motile vibrio was isolated from a selenate-respiring enrichment culture. The isolate, designated strain SES-3, grew by coupling the oxidation of lactate to acetate plus CO2 with the concomitant reduction of selenate to selenite or of nitrate to ammonium. No growth was observed on sulfate or selenite, but cell suspensions readily reduced selenite to elemental se
Authors
Ronald S. Oremland, Jodi S. Blum, Charles W. Culbertson, P.T. Visscher, Laurence G. Miller, P. Dowdle, F.E. Strohmaier
Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California
Above-ambient levels of methane and higher hydrocarbons were detected in the atmosphere of the Mono Basin. These gases emanated from several different sources, including natural gas seeps (thermogenic and biogenic), and methanogenic activity in sediments. Seeps were distributed over nearly 33% of the lake bottom and were also present in the exposed former lakebed. They originated from one or more
Authors
Ronald S. Oremland, Laurence G. Miller, Charles Colbertson, S.W. Robinson, Richard L. Smith, D. R. Lovley, Michael J. Whiticar, G. King, Ronald P. Kiene, Niels Iversen, Melinda Sargent
Meromixis in hypersaline Mono Lake, California. 3. Biogeochemical response to stratification and overturn
Mono Lake is a terminal, saline lake that became ectogenically meromictic in 1982–1983 and remained stratified until November 1988. During this period, the monimolimnion remained anoxic and nearly isothermal, while the upper mixolimnion was well oxygenated and exhibited a seasonal thermal regime. Dissolved sulfide and methane increased in the monimolimnion as a result of diffusive flux from the se
Authors
Laurence G. Miller, R. Jellison, Ronald S. Oremland, Charles W. Culbertson
Importance of methane-oxidizing bacteria in the methane budget as revealed by the use of a specific inhibitor
METHANE is a greenhouse gas whose concentration in the atmosphere is increasing. Much of this methane is derived from the metabolism of methane-generating (methanogenic) bacteria and over the past two decades much has been learned about the ecology of methanogens; specific inhibitors of methanogenesis, such as 2-bromoethanesulphonic acid, have proved useful in this regard. In contrast, although mu
Authors
Ronald S. Oremland, Charles W. Culbertson
Evaluation of methyl fluoride and dimethyl ether as inhibitors of aerobic methane oxidation
Methyl fluoride (MF) and dimethyl ether (DME) were effective inhibitors of aerobic methanotrophy in a variety of soils. MF and DME blocked consumption of CH4 as well as the oxidation of 14CH4 to 14CO2, but neither MF nor DME affected the oxidation of [14C]methanol or [14C]formate to 14CO2. Cooxidation of ethane and propane by methane-oxidizing soils was also inhibited by MF. Nitrification (ammonia
Authors
Ronald S. Oremland, Charles W. Culbertson
Nitrate is a preferred electron acceptor for growth of freshwater selenate-respiring bacteria
An anaerobic, freshwater enrichment grew with either nitrate or selenate as an electron acceptor. With both ions present, nitrate reduction preceded selenate reduction. An isolate from the enrichment grew on either ion, but the presence of nitrate precluded the reduction of selenate. Stock cultures of denitrifiers grew anaerobically on nitrate but not on selenate.
Authors
Nisan A. Steinberg, Jodi Switzer Blum, Lawrence Hochstein, Ronald S. Oremland
Science and Products
Filter Total Items: 119
Radiotracer studies of bacterial methanogenesis in sediments from the Dead Sea and Solar Lake (Sinai)
No abstract available.
Authors
Mark Marvin-DePasquale, Yoram. Geological Survey (U.S.) Cohen, Ronald S. Oremland, A. Oren
Bacterial methylmercury degradation in Florida Everglades peat sediment
Methylmercury (MeHg) degradation was investigated along an eutrophication gradient in the Florida Everglades by quantifying 14CH4 and 14CO2 production after incubation of anaerobic sediments with [14C]MeHg. Degradation rate constants (k) were consistently ≤0.1 d-1 and decreased with sediment depth. Higher k values were observed when shorter incubation times and lower MeHg amendment levels were use
Authors
M. C. Marvin-DiPasquale, R.S. Oremland
Dimethylsulfoniopropionate as a potential methanogenic substrate in Mono Lake sediments
A high concentration of dimethylsulfoniopropionate (DMSP) was found in the water column (0.1–1.8 µM particulate plus dissolved) of Mono Lake, CA, an alkaline, hypersaline waterbody. The dense Artemia monica population contained high levels of DMSP (1.7–2.5 mmol.g-1 wet weight), presumably as an osmolyte. Death of these brine shrimp caused accumulation of DMSP along the shoreline of the lake, where
Authors
P.T. Visscher, J.R. Guidetti, Charles W. Culbertson, Ronald S. Oremland
Microbial cycling of methyl bromide
Environmental concern about brominated halocarbons like methyl bromide (MeBr) is focused on their potential to destroy stratospheric ozone. Photocatalysis of MeBr and other halocarbons in the stratosphere results in the liberation of reactive CI and Br atoms. Because Br atoms are perhaps as much as 100-fold more efficient at attacking ozone than are CI atoms, bromine’s lower abundance is partly co
Authors
Ronald S. Oremland
Methanolobus taylorii sp nov, a new methylotropic, estuarine methanogen
Previously published phylogenetic studies of 16S rRNA showed that methylotrophic, slightly halophilic, methanogenic strain GS-16T (T = type strain) represents a new species of bacterium. We propose the name Methanolobus taylorii for this species; strain GS-16 is the type strain.
Authors
Ronald S. Oremland, David R. Boone
Biogeochemical transformations of selenium in anoxic environments
No abstract available.
Authors
Ronald S. Oremland
Isolation, growth, and metabolism of an obligately anaerobic, selenate- respiring bacterium, strain SES-3
A gram-negative, strictly anaerobic, motile vibrio was isolated from a selenate-respiring enrichment culture. The isolate, designated strain SES-3, grew by coupling the oxidation of lactate to acetate plus CO2 with the concomitant reduction of selenate to selenite or of nitrate to ammonium. No growth was observed on sulfate or selenite, but cell suspensions readily reduced selenite to elemental se
Authors
Ronald S. Oremland, Jodi S. Blum, Charles W. Culbertson, P.T. Visscher, Laurence G. Miller, P. Dowdle, F.E. Strohmaier
Aspects of the biogeochemistry of methane in Mono Lake and the Mono Basin of California
Above-ambient levels of methane and higher hydrocarbons were detected in the atmosphere of the Mono Basin. These gases emanated from several different sources, including natural gas seeps (thermogenic and biogenic), and methanogenic activity in sediments. Seeps were distributed over nearly 33% of the lake bottom and were also present in the exposed former lakebed. They originated from one or more
Authors
Ronald S. Oremland, Laurence G. Miller, Charles Colbertson, S.W. Robinson, Richard L. Smith, D. R. Lovley, Michael J. Whiticar, G. King, Ronald P. Kiene, Niels Iversen, Melinda Sargent
Meromixis in hypersaline Mono Lake, California. 3. Biogeochemical response to stratification and overturn
Mono Lake is a terminal, saline lake that became ectogenically meromictic in 1982–1983 and remained stratified until November 1988. During this period, the monimolimnion remained anoxic and nearly isothermal, while the upper mixolimnion was well oxygenated and exhibited a seasonal thermal regime. Dissolved sulfide and methane increased in the monimolimnion as a result of diffusive flux from the se
Authors
Laurence G. Miller, R. Jellison, Ronald S. Oremland, Charles W. Culbertson
Importance of methane-oxidizing bacteria in the methane budget as revealed by the use of a specific inhibitor
METHANE is a greenhouse gas whose concentration in the atmosphere is increasing. Much of this methane is derived from the metabolism of methane-generating (methanogenic) bacteria and over the past two decades much has been learned about the ecology of methanogens; specific inhibitors of methanogenesis, such as 2-bromoethanesulphonic acid, have proved useful in this regard. In contrast, although mu
Authors
Ronald S. Oremland, Charles W. Culbertson
Evaluation of methyl fluoride and dimethyl ether as inhibitors of aerobic methane oxidation
Methyl fluoride (MF) and dimethyl ether (DME) were effective inhibitors of aerobic methanotrophy in a variety of soils. MF and DME blocked consumption of CH4 as well as the oxidation of 14CH4 to 14CO2, but neither MF nor DME affected the oxidation of [14C]methanol or [14C]formate to 14CO2. Cooxidation of ethane and propane by methane-oxidizing soils was also inhibited by MF. Nitrification (ammonia
Authors
Ronald S. Oremland, Charles W. Culbertson
Nitrate is a preferred electron acceptor for growth of freshwater selenate-respiring bacteria
An anaerobic, freshwater enrichment grew with either nitrate or selenate as an electron acceptor. With both ions present, nitrate reduction preceded selenate reduction. An isolate from the enrichment grew on either ion, but the presence of nitrate precluded the reduction of selenate. Stock cultures of denitrifiers grew anaerobically on nitrate but not on selenate.
Authors
Nisan A. Steinberg, Jodi Switzer Blum, Lawrence Hochstein, Ronald S. Oremland