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  1. AU="Dunn, Fiona B"
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  1. Article ; Online: Correction to "Sunlight Photolysis of Extracellular and Intracellular Antibiotic Resistance Genes

    Dunn, Fiona B / Silverman, Andrea I

    Environmental science & technology

    2023  Volume 57, Issue 24, Page(s) 9118

    Language English
    Publishing date 2023-06-05
    Publishing country United States
    Document type Published Erratum
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.3c03877
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Sunlight photolysis of SARS-CoV-2 N1 gene target in the water environment: considerations for the environmental surveillance of wastewater-impacted surface waters.

    Dunn, Fiona B / Silverman, Andrea I

    Journal of water and health

    2023  Volume 21, Issue 9, Page(s) 1228–1241

    Abstract: Wastewater surveillance of SARS-CoV-2 has been used around the world to supplement clinical testing data for situational awareness of COVID-19 disease trends. Many regions of the world lack centralized wastewater collection and treatment infrastructure, ... ...

    Abstract Wastewater surveillance of SARS-CoV-2 has been used around the world to supplement clinical testing data for situational awareness of COVID-19 disease trends. Many regions of the world lack centralized wastewater collection and treatment infrastructure, which presents additional considerations for wastewater surveillance of SARS-CoV-2, including environmental decay of the RT-qPCR gene targets used for quantification of SARS-CoV-2 virions. Given the role of sunlight in the environmental decay of RNA, we evaluated sunlight photolysis kinetics of the N1 gene target in heat-inactivated SARS-CoV-2 with a solar simulator under laboratory conditions. Insignificant photolysis of the N1 target was observed in a photosensitizer-free matrix. Conversely, significant decay of the N1 target was observed in wastewater at a shallow depth (<1 cm). Given that sunlight irradiance is affected by several environmental factors, first-order decay rate models were used to evaluate the effect of water column depth, time of the year, and latitude on decay kinetics. Decay rate constants were found to decrease significantly with greater depth of the well-mixed water column, at high latitudes, and in the winter. Therefore, sunlight-mediated decay of the N1 gene target is likely to be minimal, and is unlikely to confound results from wastewater-based epidemiology programs utilizing wastewater-impacted surface waters.
    MeSH term(s) Humans ; SARS-CoV-2/genetics ; Wastewater-Based Epidemiological Monitoring ; Wastewater ; COVID-19 ; Photolysis ; Sunlight ; Environmental Monitoring ; Water
    Chemical Substances Wastewater ; Water (059QF0KO0R)
    Language English
    Publishing date 2023-09-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2123845-5
    ISSN 1996-7829 ; 1477-8920
    ISSN (online) 1996-7829
    ISSN 1477-8920
    DOI 10.2166/wh.2023.091
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Sunlight Photolysis of Extracellular and Intracellular Antibiotic Resistance Genes

    Dunn, Fiona B / Silverman, Andrea I

    Environmental science & technology

    2021  

    Abstract: Antibiotic resistance genes (ARGs; the genetic material in bacteria that encode for resistance to antibiotics) have been found in the aquatic environment, raising concerns of an environmental transmission route. In an effort to contribute to models ... ...

    Abstract Antibiotic resistance genes (ARGs; the genetic material in bacteria that encode for resistance to antibiotics) have been found in the aquatic environment, raising concerns of an environmental transmission route. In an effort to contribute to models predicting the fate of ARGs in the environment-to design control measures, predict health risks, inform ARG surveillance activities, and prioritize policy interventions-and given the importance of sunlight in damaging DNA, we evaluated the sunlight photolysis kinetics of antibiotic-resistant bacteria (ARB) and ARGs under laboratory conditions, focusing on
    Language English
    Publishing date 2021-08-04
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5851
    ISSN (online) 1520-5851
    DOI 10.1021/acs.est.1c00732
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Sunlight Photolysis of Extracellular and Intracellular Antibiotic Resistance Genes tetA and sul2 in Photosensitizer-Free Water

    Dunn, Fiona B. / Silverman, Andrea I.

    Environmental science & technology. 2021 Aug. 04, v. 55, no. 16

    2021  

    Abstract: Antibiotic resistance genes (ARGs; the genetic material in bacteria that encode for resistance to antibiotics) have been found in the aquatic environment, raising concerns of an environmental transmission route. In an effort to contribute to models ... ...

    Abstract Antibiotic resistance genes (ARGs; the genetic material in bacteria that encode for resistance to antibiotics) have been found in the aquatic environment, raising concerns of an environmental transmission route. In an effort to contribute to models predicting the fate of ARGs in the environment—to design control measures, predict health risks, inform ARG surveillance activities, and prioritize policy interventions—and given the importance of sunlight in damaging DNA, we evaluated the sunlight photolysis kinetics of antibiotic-resistant bacteria (ARB) and ARGs under laboratory conditions, focusing on Escherichia coli SMS-3-5 and its ARGs tetA and sul2. Experiments were conducted in the absence of photosensitizers, and ARG decay rates were quantified by quantitative polymerase chain reaction (qPCR) with short and long amplicon targets. Long amplicon qPCR targets quantified greater photolysis rate constants, due to greater ARG coverage. After a lag phase, intracellular ARG had faster decay rates than extracellular ARG, likely due to the contribution of intracellular indirect photolysis processes. Furthermore, all ARG decay rates were significantly slower than those of E. coli. Decay rate constants and quantum yields are presented as foundational work in the development of models to describe the persistence of ARGs in sunlit, environmental waters.
    Keywords DNA ; Escherichia coli ; antibiotic resistance ; aquatic environment ; environmental science ; issues and policy ; monitoring ; photolysis ; quantitative polymerase chain reaction ; solar radiation ; technology
    Language English
    Dates of publication 2021-0804
    Size p. 11019-11028.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1520-5851
    DOI 10.1021/acs.est.1c00732
    Database NAL-Catalogue (AGRICOLA)

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    Order via subito

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    Inter-library loan at ZB MED

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  5. Article: Chemical dissolution of oilfield strontium sulfate (SrSO4) scale by chelating agents

    Coll de Pasquali, Daniela / Horai, Edward / Real, Md Isreq / Castro, Stephanie / Dunn, Fiona B / Gunawan, Goldie / Azam, Hossain M / Wilson, Jessica M

    Applied geochemistry. 2019 July, v. 106

    2019  

    Abstract: This paper investigates the chemical dissolution of strontium sulfate (SrSO4) scale, a minimally studied and common oilfield scale, in the presence of two types of chelating agents: ethylenediametetetraacetic acid (EDTA) and diethylenetriaminepentaacetic ...

    Abstract This paper investigates the chemical dissolution of strontium sulfate (SrSO4) scale, a minimally studied and common oilfield scale, in the presence of two types of chelating agents: ethylenediametetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA). Formation of SrSO4 significantly decreases the well production and costs millions of dollars per year by seriously damaging the drilling and production equipment. Mineral scales can be chemically treated by addition of chelating agents to complex the metal. Chemical methods are cheaper and are easily applicable to exotic scales which are not easily accessible at high temperature and high pressure wells. In this work, the effects of chelate concentrations (12.50 mM–50.00 mM), temperatures (40 °C–80 °C), and pH (8 and 12) were investigated to determine optimal dissolution conditions. 24 h batch experiments conducted at pH 12 showed that increasing temperature from 40 °C to 80 °C results in an increase of overall SrSO4 dissolution, but the effect is more noticeable for EDTA than DTPA. The maximum dissolution is observed when the solution is slightly supersaturated with respect to EDTA or DTPA (Sr:EDTA or Sr:DTPA of 1:1.1 and 1:1.18). Kinetic experiments conducted at pH 12 showed that dissolution rate increases with increasing temperature and chelate concentrations for both EDTA and DTPA. Dissolution rates were lower at pH 8 than pH 12, suggesting optimal dissolution occurs at higher pH. Activation energies of 13.5–10.8 kcal/mol for 15 mM and 25 mM EDTA as well as 7.4–6.5 kcal/mol for 15 mM and 25 mM DTPA indicate SrSO4 dissolution as a surface controlled process. Thus, these results have provided the foundation for in-situ SrSO4 dissolution or dissolution of other common or exotic mineral scales.
    Keywords EDTA (chelating agent) ; activation energy ; chelating agents ; drilling ; equipment ; oil fields ; pH ; strontium sulfate ; temperature ; wells
    Language English
    Dates of publication 2019-07
    Size p. 134-141.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 1499242-5
    ISSN 0883-2927
    ISSN 0883-2927
    DOI 10.1016/j.apgeochem.2019.05.004
    Database NAL-Catalogue (AGRICOLA)

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