A5030052062- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Ruminant Nutrition and Digestive Physiology
- Atmospheric chemistry and aerosols
- Reproductive Physiology in Livestock
- Soil Geostatistics and Mapping
- Pesticide and Herbicide Environmental Studies
- Spectroscopy and Laser Applications
- Pharmaceutical and Antibiotic Environmental Impacts
- Anaerobic Digestion and Biogas Production
- Odor and Emission Control Technologies
- Statistical Methods and Bayesian Inference
- Ionosphere and magnetosphere dynamics
- Rural development and sustainability
- Wastewater Treatment and Nitrogen Removal
- Asphalt Pavement Performance Evaluation
- Landfill Environmental Impact Studies
- Atmospheric aerosols and clouds
- Plant Pathogens and Fungal Diseases
- Soil and Water Nutrient Dynamics
- Animal health and immunology
- 3D Printing in Biomedical Research
- thermodynamics and calorimetric analyses
- Microbial Metabolic Engineering and Bioproduction
- Enzyme Catalysis and Immobilization
University of Washington
2022-2025
Goddard Space Flight Center
2019-2020
University of Maryland, Baltimore County
2019-2020
Zoetis (United States)
2016
W.E. Upjohn Institute for Employment Research
1985-2013
University of Otago
2005
Pfizer (United States)
1992
Agricultural Research Service
1990
Michigan State University
1981-1984
Montana State University
1984
[This corrects the article on p. 1454 in vol. 45.].
Crossbred steers (n = 20; 316 ± 4 kg BW), each fitted with a ruminal cannula, were used to evaluate the effects of acute acidosis (AA) and subacute (SA) on DMI, fermentation, blood chemistry, endocrine profiles. Animals blocked by BW assigned treatments including 1) intraruminal (via cannula) steam-flaked corn (3% BW; AA); 2) dry-rolled wheat:dry-rolled (50:50; 1.5% SA); 3) offering forage-adapted ad libitum access 50% concentrate diet (AA control; AC); 4) diet-adapted (SA SC). Samples fluid...
Abstract Aerobic glucose metabolism by Pseudomonas aeruginosa in steady‐state biofilms at various substrate loading rates and reactor dilution was investigated. Variables monitored were (glucose), biofilm cellular density, extracellular polymeric substance (EPS) suspended EPS concentrations. A mathematical model developed to describe the system compared experimental data. Intrinsic yield rate coefficients included obtained from continuous culture studies of P. . Experimental data well with...
Distributions of many chemical, physical, and microbiological properties soils appear to be lognormal. Several conflicting recommendations exist in the soil science statistical literature on how best estimate population mean, variance, coefficient variation lognormally distributed data. We chose determine with certainty which following three methods is best: (i) method moments (method 1); (ii) maximum likelihood 2); (iii) Finney's 3). assessed efficacy these for estimating lognormal data...
Michaelis-Menten kinetic parameters for H 2 consumption by three methanogenic habitats were determined from progress curve and initial velocity experiments. The influences of mass transfer resistance, endogenous production, growth on apparent parameter estimates also investigated. Kinetic could not be undiluted rumen fluid some digestor sludge gas-phase measurements , since across the gas-liquid interface was rate limiting. However, accurate values obtained once samples diluted. with a long...
The kinetic parameters associated with the microbial dehalogenation of 3-chlorobenzoate, 3,5-dichlorobenzoate, and 4-amino-3,5-dichlorobenzoate were measured in anoxic sediment slurries an enriched methanogenic culture grown on 3-chlorobenzoate. initial substrates exhibited Michaelis-Menten kinetics. apparent K m values for above ranged from 30 to 67 μM. pattern degradation, however, was unusual. enrichment accumulated partially dehalogenated intermediates 72 98% that possible when incubated...
ABSTRACT The objective of this study was to evaluate the role reductive acetogenesis as an alternative H 2 disposal mechanism in rumen. /CO -supported acetogenic ruminal bacteria were enumerated by using a selective inhibitor methanogenesis, 2-bromoethanesulfonic acid (BES). Acetogenic ranged density from 2.5 × 10 5 cells/ml beef cows fed high-forage diet 75 finishing steers high-grain diet. Negligible endogenous activity demonstrated incubations containing contents, NaH 13 CO 3 , and 100%...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe world's largest landfillJoseph M. Suflita, Charles P. Gerba, Robert K. Ham, Anna C. Palmisano, William L. Rathje, and Joseph A. RobinsonCite this: Environ. Sci. Technol. 1992, 26, 8, 1486–1495Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.acs.org/doi/10.1021/es00032a002https://doi.org/10.1021/es00032a002research-articleACS PublicationsRequest reuse...
Abstract The kinetics of cellular reproduction and the rate extent synthesis extracellular polymeric substances (EPS) were investigated for P. aeruginosa growing in glucose‐limited chemostats. μ max K s estimates 0.4 h −1 2 mg glucose C/L, respectively, at 25°C obtained this bacterium. EPS formation was inversely related to growth . had both growth‐ non‐growth‐associated components. growth‐associated polymer coefficient ( k ) 0.3 C/mg C ′) 0.04 C/h. values ′ must be regarded as provisional...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrogen-Butane SystemW. W. Akers, L. Attwell, and J. A. RobinsonCite this: Ind. Eng. Chem. 1954, 46, 12, 2539–2540Publication Date (Print):December 1, 1954Publication History Published online1 May 2002Published inissue 1 December 1954https://pubs.acs.org/doi/10.1021/ie50540a041https://doi.org/10.1021/ie50540a041research-articleACS PublicationsRequest reuse permissionsArticle Views105Altmetric-Citations32LEARN ABOUT THESE METRICSArticle Views are...
Benzoate degradation by an anaerobic, syntrophic bacterium, strain SB, in coculture with Desulfovibrio sp. G-11 reached a threshold value which depended on the amount of acetate added and ranged from about 2.5 to 29.9 (mu)M. Increasing concentrations also uncompetitively inhibited benzoate degradation. The apparent V(infmax) K(infm) for decreased increasing concentration, but capacities (V(infmax)/K(infm)) cell suspensions remained comparable. addition acetate-using bacterium cocultures...
A method of transferring dissolved H2 to a CO2 headspace and then absorbing out the concentrate before gas chromatographic analysis was developed measure low concentrations H2. detection limit 10 pmol ml-1 water achieved. When used ot monitor changes in bovine rumen, 10-fold increase noted 1 h after feeding declined rapidly normal steady-state concentration microM.
Dissolved hydrogen was measured in the bovine rumen using an situ probe coupled to a mercury reduction detector. The can quantitate dissolved from low nM concentrations saturation. In of steers fed every 3 h, basal averaged 1.38 μM ± 0.26, and level remained stable throughout 18–25 h period. contrast, steer once day had concentration 1.40 μM, but not between feedings. For reticulum displayed most dramatic fluctuations after feeding event. Hydrogen spikes (10–20 μM) were detected 2 min feed...
Accurate predictions of carbon and energy cycling rates in the environment depend on sampling frequencies spatial variability associated with biological activities. We examined anaerobic biodegradation at two sites an alluvial sand aquifer polluted by municipal landfill leachate. In situ methane production were measured for almost a year, using wells installed sites. Methane ranged from 0 to 560 μmol · m -2 day -1 one site (A), while range 120,000 was B. The mean standard deviations A 17 57...
Forty-two samples taken from two landfills were monitored for CH(inf4) production and apparent steady-state H(inf2) concentration. The rates of methanogenesis in these ranged below the detection limit to 1,900 (mu)mol kg (dry weight)(sup-1) day(sup-1), median hydrogen concentration was 1.4 (mu)M one landfill 5.2 other. To further investigate relationship between methanogenesis, a subset seven selected on basis their production, concentrations, sample pHs, moisture contents. Samples with...