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  1. AU="Dowdell, Katherine S"
  2. AU="Ton That, Viet"
  3. AU="Rodrigo Morales"
  4. AU="Pilla, Kala Bharath"
  5. AU="Micheva, Kristina D"
  6. AU="Smigliani, Ariela"
  7. AU="Griesshaber, Hanna"
  8. AU="Fernandes, Regina"
  9. AU="Wezendonk, Lisanne H T" AU="Wezendonk, Lisanne H T"
  10. AU="The BRIDGES Consortium"
  11. AU="Takaharu Isobe"
  12. AU="O'Donnell, Joan"
  13. AU="Montesinos-Guevara, Camila"
  14. AU="Şükrü Yıldız"
  15. AU="Sarewitz, Daniel" AU="Sarewitz, Daniel"
  16. AU="Reshaeel, Muhammad"
  17. AU="Imbesi, Venerina"
  18. AU=Elpeltagy Marwa
  19. AU="Lobo, Rosario Pintos"
  20. AU="Makulović Stefan"
  21. AU="E.‑K. Kim"
  22. AU="Sijing Wu"
  23. AU="Rus, Mircea"
  24. AU="Yanqin Yang"
  25. AU="von Paris, Philip"
  26. AU=Tanaka K
  27. AU="Olesen, Jes"
  28. AU="Liao, Walter"
  29. AU="Lindfeldt, Isis"
  30. AU="A Bataineh, Ziad"

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  1. Artikel ; Online: Protozoan-Priming and Magnesium Conditioning Enhance

    Cambronne, Eric D / Ayres, Craig / Dowdell, Katherine S / Lawler, Desmond F / Saleh, Navid B / Kirisits, Mary Jo

    Environmental science & technology

    2023  Band 57, Heft 40, Seite(n) 14871–14880

    Abstract: Opportunistic pathogens (OPs) are of concern in drinking water distribution systems because they persist despite disinfectant residuals. While many OPs garner protection from disinfectants via a biofilm lifestyle, ...

    Abstract Opportunistic pathogens (OPs) are of concern in drinking water distribution systems because they persist despite disinfectant residuals. While many OPs garner protection from disinfectants via a biofilm lifestyle,
    Mesh-Begriff(e) Humans ; Legionella pneumophila/genetics ; Magnesium/pharmacology ; Water Microbiology ; Disinfectants/pharmacology ; Amoeba
    Chemische Substanzen chloramine (KW8K411A1P) ; Magnesium (I38ZP9992A) ; Disinfectants
    Sprache Englisch
    Erscheinungsdatum 2023-09-27
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c04013
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Investigating the suitability of online flow cytometry for monitoring full-scale drinking water ozone system disinfection effectiveness.

    Dowdell, Katherine S / Olsen, Kirk / Martinez Paz, Ernesto F / Sun, Aini / Keown, Jeff / Lahr, Rebecca / Steglitz, Brian / Busch, Andrea / LiPuma, John J / Olson, Terese / Raskin, Lutgarde

    Water research

    2024  Band 257, Seite(n) 121702

    Abstract: While online monitoring of physicochemical parameters has widely been incorporated into drinking water treatment systems, online microbial monitoring has lagged behind, resulting in the use of surrogate parameters (disinfectant residual, applied dose, ... ...

    Abstract While online monitoring of physicochemical parameters has widely been incorporated into drinking water treatment systems, online microbial monitoring has lagged behind, resulting in the use of surrogate parameters (disinfectant residual, applied dose, concentration × time, CT) to assess disinfection system performance. Online flow cytometry (online FCM) allows for automated quantification of total and intact microbial cells. This study sought to investigate the feasibility of online FCM for full-scale drinking water ozone disinfection system performance monitoring. A water treatment plant with high lime solids turbidity in the ozone contactor influent was selected to evaluate the online FCM in challenging conditions. Total and intact cell counts were monitored for 40 days and compared to surrogate parameters (ozone residual, ozone dose, and CT) and grab sample assay results for cellular adenosine triphosphate (cATP), heterotrophic plate counts (HPC), impedance flow cytometry, and 16S rRNA gene sequencing. Online FCM provided insight into the dynamics of the full-scale ozone system, including offering early warning of increased contactor effluent cell concentrations, which was not observed using surrogate measures. Positive correlations were observed between online FCM intact cell counts and cATP levels (Kendall's tau=0.40), HPC (Kendall's tau=0.20), and impedance flow cytometry results (Kendall's tau=0.30). Though a strong correlation between log intact cell removal and CT was not observed, 16S rRNA gene sequencing results showed that passage through the ozone contactor significantly changed the microbial community (p < 0.05). Potential causes of the low overall cell inactivation in the contactor and the significant changes in the microbial community after ozonation include regrowth in the later chambers of the contactor and varied ozone resistance of drinking water microorganisms. This study demonstrates the suitability of direct, online microbial analysis for monitoring full-scale disinfection systems.
    Mesh-Begriff(e) Ozone ; Flow Cytometry/methods ; Disinfection/methods ; Drinking Water/microbiology ; Water Purification/methods
    Chemische Substanzen Ozone (66H7ZZK23N) ; Drinking Water
    Sprache Englisch
    Erscheinungsdatum 2024-04-30
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 202613-2
    ISSN 1879-2448 ; 0043-1354
    ISSN (online) 1879-2448
    ISSN 0043-1354
    DOI 10.1016/j.watres.2024.121702
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Z 78/260: Hefte anzeigen
    Z 3381: Hefte anzeigen

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  3. Artikel: Biodegradation and attenuation of MIB and 2,4-D in drinking water biologically active sand and activated carbon filters

    Shimabuku, Kyle K. / Zearley, Thomas L / Dowdell, Katherine S. / Summers, R. Scott

    Environmental science : Water research & technology

    2019  Band 5, Heft 5, Seite(n) 849

    Sprache Englisch
    Dokumenttyp Artikel
    ZDB-ID 2833082-1
    ISSN 2053-1400
    Datenquelle Current Contents Ernährung, Umwelt, Agrar

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    Z 7947: Hefte anzeigen

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  4. Artikel ; Online: Legionella pneumophila occurrence in reduced-occupancy buildings in 11 cities during the COVID-19 pandemic

    Dowdell, Katherine S / Greenwald, Hannah D / Joshi, Sayalee / Grimard-Conea, Marianne / Pitell, Sarah / Song, Yang / Ley, Christian / Kennedy, Lauren C / Vosloo, Solize / Huo, Linxuan / Haig, Sarah-Jane / Hamilton, Kerry A / Nelson, Kara / Pinto, Ameet J / Prevost, Michele / Proctor, Caitlin R / Raskin, Lutgarde / Whelton, Andrew J / Garner, Emily /
    Pieper, Kelsey J / Rhoads, William J.

    medRxiv

    Abstract: In spring 2020, reduced water demand was an unintended consequence of COVID-19 pandemic-related building closures. Concerns arose that contaminants associated with water stagnation, such as ... Legionella pneumophila ... , could become prevalent. To ... ...

    Abstract In spring 2020, reduced water demand was an unintended consequence of COVID-19 pandemic-related building closures. Concerns arose that contaminants associated with water stagnation, such as Legionella pneumophila, could become prevalent. To investigate this potential public health risk, samples from 26 reduced-occupancy buildings across 11 cities in the United States, Canada, and Switzerland were analyzed for L. pneumophila using liquid culture (Legiolert, n=258) and DNA-based methods (qPCR/ddPCR, n=138). L. pneumophila culture-positivity was largely associated with just five buildings, each of which had specific design or operational deficiencies commonly associated with L. pneumophila occurrence. Samples from free chlorine buildings had higher culture-positivity (37%) than chloramine buildings (1%), and 78% of culture-positive samples occurred when the residual was ≤0.1 mg/L Cl2. Although overall sample positivities using culture- and DNA-based methods were equivalent (34% vs. 35%), there was disagreement between the methods in 13% of paired samples. Few buildings reported any water management activities, and L. pneumophila concentrations in flushed samples were occasionally greater than in first-draw samples. This study provides insight into how building plumbing characteristics and management practices contribute to L. pneumophila occurrence during low water use periods and can inform targeted prevention and mitigation efforts.
    Schlagwörter covid19
    Sprache Englisch
    Erscheinungsdatum 2022-06-29
    Verlag Cold Spring Harbor Laboratory Press
    Dokumenttyp Artikel ; Online
    DOI 10.1101/2022.06.28.22277022
    Datenquelle COVID19

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