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38 results on '"Sassoubre, Lauren M."'

6. Performance of viruses and bacteriophages for fecal source determination in a multi-laboratory, comparative study

Author

Harwood, Valerie J., Boehm, Alexandria B., Sassoubre, Lauren M., Vijayavel, Kannappan, Stewart, Jill R., Fong, Theng-Theng, Caprais, Marie-Paule, Converse, Reagan R., Diston, David, Ebdon, James, Fuhrman, Jed A., Gourmelon, Michele, Gentry-Shields, Jennifer, Griffith, John F., Kashian, Donna R., Noble, Rachel T., Taylor, Huw, and Wicki, Melanie

Published
2013
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8. SARS-CoV-2 RNA in Wastewater Settled Solids Is Associated with COVID-19 Cases in a Large Urban Sewershed

Author

Graham, Katherine E., primary, Loeb, Stephanie K., additional, Wolfe, Marlene K., additional, Catoe, David, additional, Sinnott-Armstrong, Nasa, additional, Kim, Sooyeol, additional, Yamahara, Kevan M., additional, Sassoubre, Lauren M., additional, Mendoza Grijalva, Lorelay M., additional, Roldan-Hernandez, Laura, additional, Langenfeld, Kathryn, additional, Wigginton, Krista R., additional, and Boehm, Alexandria B., additional

Published
2020
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9. SARS-CoV-2 in wastewater settled solids is associated with COVID-19 cases in a large urban sewershed

Author

Graham, Katherine E., primary, Loeb, Stephanie K., additional, Wolfe, Marlene K., additional, Catoe, David, additional, Sinnott-Armstrong, Nasa, additional, Kim, Sooyeol, additional, Yamahara, Kevan M., additional, Sassoubre, Lauren M., additional, Mendoza, Lorelay M., additional, Roldan-Hernandez, Laura, additional, Li, Linlin, additional, Wigginton, Krista R., additional, and Boehm, Alexandria B., additional

Published
2020
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10. Trends in Antimicrobial Resistance Genes in Manure Blend Pits and Long-Term Storage Across Dairy Farms with Comparisons to Antimicrobial Usage and Residual Concentrations

Author

Hurst, Jerod J., primary, Oliver, Jason P., additional, Schueler, Jenna, additional, Gooch, Curt, additional, Lansing, Stephanie, additional, Crossette, Emily, additional, Wigginton, Krista, additional, Raskin, Lutgarde, additional, Aga, Diana S., additional, and Sassoubre, Lauren M., additional

Published
2019
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15. Sunlight-mediated inactivation of health-relevant microorganisms in water: a review of mechanisms and modeling approaches

Author

Nelson, Kara L., primary, Boehm, Alexandria B., additional, Davies-Colley, Robert J., additional, Dodd, Michael C., additional, Kohn, Tamar, additional, Linden, Karl. G., additional, Liu, Yuanyuan, additional, Maraccini, Peter A., additional, McNeill, Kristopher, additional, Mitch, William A., additional, Nguyen, Thanh H., additional, Parker, Kimberly M., additional, Rodriguez, Roberto A., additional, Sassoubre, Lauren M., additional, Silverman, Andrea I., additional, Wigginton, Krista R., additional, and Zepp, Richard G., additional

Published
2018
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37. Sources and fate of Salmonellaand fecal indicator bacteria in an urban creek.

Author

Sassoubre, Lauren M., Walters, Sarah P., Russell, Todd L., and Boehm, Alexandria B.

Abstract

This research aimed to understand the sources and fate of Salmonellaand fecal bacteria in urban surface waters. An urban creek (San Pedro Creek, California, USA) that had unusually high levels of Salmonellaand fecal bacteria relative to other nearby waterbodies was chosen as a model field site. State of the art microbiological methods were used in concert with modeling to investigate Salmonellaand fecal bacteria sources, and determine field-relevant dark inactivation and photoinactivation rates. Three along-creek surveys that spanned reaches adjacent to both urban and forested land covers were conducted to measure Salmonella, enterococci, Escherichia coli, and horse- and human-specific Bacteroidales. Salmonellawere detected adjacent to and downstream of urban land cover, but not adjacent to forested land cover. No human or horse-specific Bacteroidalesfecal markers were detected implicating other urban animal sources of bacteria. Two locations along the creek where Salmonellawas consistently detected were sampled hourly for 25 hours and a mass-balance model was applied to determine field-relevant light and dark inactivation rates for Salmonella, enterococci, and E. coli. Sunlight inactivation did not appear to be important in modulating concentrations of Salmonella, but was important in modulating both enterococci and E. coliconcentrations. Dark inactivation was important for all three organisms. This is the first study to quantitatively examine the fate of Salmonellawithin an urban surface water. Although the work is carried out at a single site, the methodologies are extendable to source tracking in other waterbodies. Additionally, the rate constants determined through the modeling will be useful for modeling these organisms in other surface waters, and represent useful benchmarks for comparison to laboratory-derived inactivation rates. [ABSTRACT FROM AUTHOR]

Published
2011
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38. Sunlight-mediated inactivation of health-relevant microorganisms in water: a review of mechanisms and modeling approaches

Author

Nelson, Kara L., Boehm, Alexandria B., Davies-Colley, Robert J., Dodd, Michael C., Kohn, Tamar, Linden, Karl G., Liu, Yuanyuan, Maraccini, Peter A., McNeill, Kristopher, Mitch, William A., Nguyen, Thanh H., Parker, Kimberly M., Rodriguez, Roberto A., Sassoubre, Lauren M., Silverman, Andrea I., Wigginton, Krista R., and Zepp, Richard G.

Subjects
integumentary system, 13. Climate action, food and beverages, 6. Clean water
Abstract

Health-relevant microorganisms present in natural surface waters and engineered treatment systems that are exposed to sunlight can be inactivated by a complex set of interacting mechanisms. The net impact of sunlight depends on the solar spectral irradiance, the susceptibility of the specific microorganism to each mechanism, and the water quality; inactivation rates can vary by orders of magnitude depending on the organism and environmental conditions. Natural organic matter (NOM) has a large influence, as it can attenuate radiation and thus decrease inactivation by endogenous mechanisms. Simultaneously NOM sensitizes the formation of reactive intermediates that can damage microorganisms via exogenous mechanisms. To accurately predict inactivation and design engineered systems that enhance solar inactivation, it is necessary to model these processes, although some details are not yet sufficiently well understood. In this critical review, we summarize the photo-physics, -chemistry, and -biology that underpin sunlight-mediated inactivation, as well as the targets of damage and cellular responses to sunlight exposure. Viruses that are not susceptible to exogenous inactivation are only inactivated if UVB wavelengths (280–320 nm) are present, such as in very clear, open waters or in containers that are transparent to UVB. Bacteria are susceptible to slightly longer wavelengths. Some viruses and bacteria (especially Gram-positive) are susceptible to exogenous inactivation, which can be initiated by visible as well as UV wavelengths. We review approaches to model sunlight-mediated inactivation and illustrate how the environmental conditions can dramatically shift the inactivation rate of organisms. The implications of this mechanistic understanding of solar inactivation are discussed for a range of applications, including recreational water quality, natural treatment systems, solar disinfection of drinking water (SODIS), and enhanced inactivation via the use of sensitizers and photocatalysts. Finally, priorities for future research are identified that will further our understanding of the key role that sunlight disinfection plays in natural systems and the potential to enhance this process in engineered systems., Environmental Science: Processes & Impacts, 20 (8), ISSN:2050-7887, ISSN:2050-7895

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