Extracts from staghorn sumac (Rhus typhina) fruits were obtained from fresh fruits obtained from June to October in two successive years. Total acidity, pH, and concentrations of malic and succinic acids determined using liquid... more
Extracts from staghorn sumac (Rhus typhina) fruits were obtained from fresh fruits obtained from June to October in two successive years. Total acidity, pH, and concentrations of malic and succinic acids determined using liquid chromatography were measured for each extract. Acidity and acid concentrations reached their maxima in late July, and declined slowly thereafter. Malic and succinic acid concentrations in
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Heterotrophic bacterial uptake and turnover of glycolate were measured in the water column of the New York Bight apex during four seasonal cruises over almost a one-year period between May 1977 and March 1978. Glycolate turnover was most... more
Heterotrophic bacterial uptake and turnover of glycolate were measured in the water column of the New York Bight apex during four seasonal cruises over almost a one-year period between May 1977 and March 1978. Glycolate turnover was most rapid in May and July, when primary productivity and estuarine runoff were high. Extremely rapid glycolate turnover times (<1 h) were detected
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The characteristics of Mn(II) removal from sediment porewater and the potential role of manganese-oxidizing bacteria in this process were examined in sediments from a 335-m deep station in the Laurentian Trough of the St. Lawrence... more
The characteristics of Mn(II) removal from sediment porewater and the potential role of manganese-oxidizing bacteria in this process were examined in sediments from a 335-m deep station in the Laurentian Trough of the St. Lawrence estuary. Manganese-oxidizing ...
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Research Interests: Metallurgy, Bioremediation, Passive Treatment, Polymers, Multidisciplinary, and 17 moreHeavy metals, Poly (lactic acid), Copper, Zinc, Nickel, Constructed Wetland, Analysis of Variance, Time Factors, West Virginia, Sulfate reduction, Lactic Acid, Biological Availability, Hydrogen-Ion Concentration, Calcium Sulfate, Sulfates, Redox Potential, and Waste products
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Preliminary effects of Marcellus shale drilling on Louisiana Waterthrush in West Virginia; Page 1 of 1; Doug Becker and James Sheehan, WV Cooperative Fish and Wildlife Research Unit, West Virginia Univ.,; Morgantown, WV 26506, USA; Petra... more
Preliminary effects of Marcellus shale drilling on Louisiana Waterthrush in West Virginia; Page 1 of 1; Doug Becker and James Sheehan, WV Cooperative Fish and Wildlife Research Unit, West Virginia Univ.,; Morgantown, WV 26506, USA; Petra Bohall Wood, U.S. Geological Survey, WV Cooperative Fish and Wildlife; Research Unit, West Virginia Univ., Morgantown, WV 26506, USA; Harry Edenborn, National Energy Technology; Laboratory, U.S. Department of Energy, Pittsburgh, PA 15236, USA.; Spurred by technological advances and high energy prices, extraction of natural gas from Marcellus shale is; increasing in the Appalachian Region. Because little is known about effects on wildlife populations, we studied; immediate impacts of oil and gas CO&G) extraction on demographics and relative abundance of Louisiana; Waterthrush'CLOWA), a riparian obligate species, to establish a baseline for potential future changes. Annually; in 2008-2010, we conducted point counts, monitored Mayfield nesting success, spotted-mapped territories, and; measured habitat quality using the EPA Rapid Bioassessment protocol for high gradient streams and a LOWA; Habitat Suitability Index CHSI) on a 4,100 ha study area in northern West Virginia. On 11 streams, the stream; length affected by O&G activities was 0-58%. Relative abundance, territory denSity, and nest success varied; annually but were not significantly different across years. Success did not differ between impacted and; unimpacted nests, but territory density had minimal correlation with percent of stream impacted by O&G; activities. Impacted nests had lower HSI values in 2010 and lower EPA indices in 2009. High site fidelity could; mask the immediate impacts of habitat disturbance from drilling as we measured return rates of 57%. All; returning individuals were on the same stream they were banded and 88% were within 250 m of their territory; from the previous year. We also observed a spatial shift in LOWA territories, perhaps in response to drilling; activities. Preliminary results identified few differences at low habitat disturbance levels but highlight the need; for continued monitoring with increasing disturbance.; file:
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Abstract A bench-scale biogenic sulfide and limestone treatment system was used to treat-acidic metal-contaminated water from the Berkeley Pit, an abandoned open-pit copper mine in Butte, Montana. Hydrogen sulfide was generated in a... more
Abstract A bench-scale biogenic sulfide and limestone treatment system was used to treat-acidic metal-contaminated water from the Berkeley Pit, an abandoned open-pit copper mine in Butte, Montana. Hydrogen sulfide was generated in a sulfate reduction bioreactor and ...
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The effect of sequence on copolymer properties is rarely studied despite the precedent from Nature that monomer order can create materials of significant diversity. Poly(lactic-co-glycolic acid) (PLGA), one of the most important... more
The effect of sequence on copolymer properties is rarely studied despite the precedent from Nature that monomer order can create materials of significant diversity. Poly(lactic-co-glycolic acid) (PLGA), one of the most important biodegradable copolymers, is widely used in an unsequenced, random form for both drug delivery microparticles and tissue engineering matrices. Sequenced PLGA copolymers have been synthesized and fabricated into microparticles to study how their hydrolysis rates compare to those of random copolymers. Sequenced PLGA microparticles were found to degrade at slower, and often more constant, rates than random copolymers with the same lactic to glycolic acid ratios as demonstrated by molecular weight decrease, lactic acid release, and thermal property analyses. The impact of copolymer sequence on in vitro release was studied using PLGA microparticles loaded with model agent rhodamine-B. These assays established that copolymer sequence affects the rate of release and that a more gradual burst release can be achieved using sequenced copolymers compared to a random control.
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Research Interests: Microbiology, Carbon, Microbial Ecology, Medical Microbiology, Ecology, and 16 moreCoal Mining, Wetland, Ph, Method, Sediments, Iron, Sulfate reducing Bacteria, Sediment, Soil Microbiology, Gels, Acrylic Resins, Low Temperature, Sulfate reduction, Geologic Sediments, Oxidation-Reduction, and Ferric Compounds
... Keywords alabandite, coal mine drainage, early diagenesis, iron monosulfide, manganese, manganese oxide, redox gel ... open water area developed extensive oating algal mats in the early summer (ca. ... MnCO3) being more likely to form... more
... Keywords alabandite, coal mine drainage, early diagenesis, iron monosulfide, manganese, manganese oxide, redox gel ... open water area developed extensive oating algal mats in the early summer (ca. ... MnCO3) being more likely to form prior to the other carbonate minerals. ...