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Showing 1 to 20 of 33 for “"die off"”.

  1. Cheatgrass die-off in the Great Basin: A comparison of remote sensing detection methods and identification of environments favorable to die-off

    Brehm, Joseph R.2019

    … An improved understanding of cheatgrass die-off, or stand emergence failure, could lead to additional means of control for this widespread invasive. The majority of published research has focused on identifying the cause of die-off, on demonstrating its potential for contributing to …

    unr Repository record

  2. Estimating Bacterial Loadings to Surface Waters from Agricultural Watersheds

    Panhorst, Kimberly A.Virginia Tech2002

    … models are needed that describe bacterial die-off and transport processes under field conditions. Before these bacterial models can be developed, more field-derived information is needed regarding bacterial survival and transport. The objectives of this research were to evaluate bacterial …

    vt Repository record

  3. Selection of Pathogen Surrogates and Fresh Produce Safety: Implications for Public Health and Irrigation Water Quality Policy

    Givan, Ethan

    … were above detection levels for 22 days. Die-off rates were calculated for all isolates, with the QC strain having the greatest rate of die-off in the first experiment (k = -4.52) and the second greatest in the second experiment (-2.82) while the pathogens and selected surrogates had …

    wku-diss Repository record

  4. ASSESSING DROUGHT-INDUCED CHANGE IN A PI\xd1ON-JUNIPER WOODLAND WITH LANDSAT: A MULTIPLE ENDMEMBER SPECTRAL MIXTURE ANALYSIS APPROACH

    Brewer, William

    … piñon show greater vulnerability to die-off than juniper. Widespread piñon die-off occurred during 2002-2004 from extreme drought in northern New Mexico with minimal juniper die-off. This study quantified the differential piñon and juniper mortality during the 2010-2013 …

    unm Repository record

  5. Effect of Anaerobic Soil Disinfestation on Salmonella Concentration Using Different Soil Amendments

    Marik, Claire MargaretVirginia Tech2020

    … The study aimed to compare Salmonella die-off following inoculation in ASD and non-ASD processed soil and compare Salmonella die-off in amended and non-amended soils following ASD. Two independent experiments were arranged in randomized complete block designs (four replications per …

    vt Repository record

  6. Evaluating Risks and Mitigation Measures for Foodborne Pathogens on Harvest Bags

    Ayuk Etaka, Cyril NsomVirginia Tech2024

    … d across all surfaces and exhibited a triphasic die-off pattern. Similarly, L. monocytogenes and Salmonella exhibited die-off in phases with an initial rapid die-off followed by more gradual die-off rates up to 21 d. Canvas materials also promoted better L. monocytogenes and Salmonella survival …

    vt Repository record

  7. Water Quality Modeling in Kranji Catchment

    Granger, Erika CMassachusetts Institute of Technology2010

    … most important of these values is the bacterial die-off rate. This rate must be accurate for the model to provide accurate predictions of bacterial loadings. In order to obtain a value for the bacterial die-off rate, an attenuation study was conducted. The results of this study were not typical. …

    mit Repository record

  8. Trophic ecology of an introduced, land-locked alewife (Alosa pseudoharengus) population and assessment of alewife impact on resident sportfish and crustacean zooplankton communities in Claytor Lake, Virginia

    Kohler, Christopher C.Virginia Polytechnic Institute and State University1980

    … of age 0 sportfish resident in that habitat. Dietary overlaps (Levins' equation) between adult alewife and young-of-year sportfishes indicated that competitive interactions may occur on a time/site-specific basis. Alewife were demonstrated to be highly size-selective planktivores, preferring …

    vt Repository record

  9. Survival and condition of riverine freshwater mussels (Unionidae) confined in cages suspended in ponds

    Burress, Jonathan W.Virginia Tech1995

    … (x=79%) after 7 months, but a nearly complete die-off of captive mussels occurred during hot weather in July, 1994. Survival of six mussel species at the Marion state Fish Hatchery was low for both the sleeve and unrestricted holding methods, 35% and 8%, respectively, after 14 months. It is …

    vt Repository record

  10. Aerobic digestion of waste activated sludge from biological nutrient removal activated sludge systems

    Mebrahtu, Michael KidaneDepartment of Civil Engineering2007

    … (NDBEPR) WAS based on the individual biomass die-off rates of phosphorus accumulating organisms (PAOs) and ordinary heterotrophic organisms (OHOs), and (5) evaluate the ASM-2 simulation results with steady state aerobic batch digestion model.

    cape-town Repository record

  11. A Combined Field And Laboratory Investigation Into The Transport Of Fecal Indicator Microorganisms Through A Shallow Drinking Water Aquifer In Bangladesh

    Feighery, John E.2013

    … attachment modes incorporating bacterial die-off was developed. Where the two-population phenomenon was observed, one population typically was highly irreversible while the other was reversible with a smaller irreversible attachment rate. When applied to transport in the field, this model …

    columbia-diss Repository record

  12. No One Wants To Be A Parasitologist: The Shrinking Field of America's Least Favorite Animals

    Richter, HannahMassachusetts Institute of Technology2024

    … creatures it encompasses are vastly understudied. An increasing volume of research shows that parasites play important ecological functions, from keeping animal populations in check to stabilizing food chains to driving evolution and biodiversity. While parasites can cause horrible human …

    mit Repository record

  13. Fate of Salmonella and Listeria monocytogenes in different frozen produce commodities

    Osorio Barahona, Monica SofiaVirginia Tech2025

    Outbreaks have been associated with the consumption of frozen produce, and produce that was purchased fresh and then frozen at home. Consumers may expose produce to repeated freezing and thawing, at different temperatures and times. This study aims to (i) model the survival of Salmonella and …

    vt Repository record

  14. Fate and Transport of Pathogen Indicators from Pasturelands

    Soupir, Michelle LynnVirginia Tech2007

    … and then applying this method to analyze runoff samples collected from small box plots and large transport plots. The box plot experiments examined the partitioning of pathogen indicators in runoff from three different soil types while the transport plot experiments examined partitioning at …

    vt Repository record

  15. Transport of copiotrophic bacteria in oligotrophic coarse soils: a Monte Carlo analysis

    Peterson, Thomas Charles, author, Ward, Robert C., advisor, Warner, James W., committee member, Hunt, H. William, committee member, Doxtader, Kenneth G., committee memberColorado State University. Libraries1987

    … zone located in the soil below each system. Studies have shown that 0.6 to 1.2 m of unsaturated soil below an on-site system drainfield is sufficient to remove most bacteria and viruses in most environments. Little is known of the transport of pathogenic, copiotrophic bacteria in coarse-grained …

    colostate Repository record

  16. Reproduction and early life history of a landlocked population of alewife (Alosa pseudoharencus) in Claytor Lake, Virginia

    Nigro, Anthony A.Virginia Polytechnic Institute and State University1980

    … for food and space following an alewife die-off in winter 1977-1978. Rapid growth of young-of-the-year alewives allowed the earliest spawned cohorts to become morphologically unavailable as prey to age 0 and age I sportfish by mid-July. However, the extended alewife spawning season …

    vt Repository record

  17. Carbon and Nitrogen Dynamics in High Intensity Minimal Exchange Shrimp (<i>Litopenaeus vannamei</i>) Raceways

    Francis, John Henry2018

    … abundance (BA). The first growout had a complete die-off. The carbon and nitrogen budgets for the second and third growouts showed overall that the major input was feed and the major output was shrimp at harvest. The plastic media did not show any statistically significant effect on water quality …

    usm Repository record

  18. Analysis of the efficacy of a constructed wetland in treating human fecal contamination

    Kondepudi, Kathyayani ShobhnaMassachusetts Institute of Technology2012

    … pollutants to improve the quality of surface runoff. The Alexandra Canal constructed wetland in Singapore is a system of four wetlands, each having different retention times, where water flows in series from a sedimentation bay to a surface flow wetland, thereafter passing through a floating …

    mit Repository record

  19. To Shift or Not To Shift: Maximizing the Efficiency of a Wireless Sensor Network Using Multiple Sinks

    Boler, Chabli2016

    … maximal capacity as the sensor nodes start to die off because of energy depletion, interference from nearby objects, or some type of mechanical failure. By adding multiple sink nodes, we will be able switch between the various sink nodes and choose the sink node that will yield the optimal …

    usm Repository record

  20. Comparison of Wild-Domestic Sheep Interaction Policies in Bighorn Disease Outbreak Locations in the Continental U.S., 1990-2010

    Howard, Tristan

    … efficacy. Locations examined and their bighorn die-off dates include: the Tobin Range, NV (1991); Aldrich Mountain, OR (1991); the Highland/Pioneer Mountains, MT (1994-1995); the Tarryall/Kenosha Mountains, CO (1997-2000); the Hays Canyon Range, NV (2007); and Bonner/West Riverside, MT (2010). …

    montana-tech Repository record

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