1. Articles from Wen-Tso Liu

    1-4 of 4
    1. Ugly ducklings—the dark side of plastic materials in contact with potable water

      Ugly ducklings—the dark side of plastic materials in contact with potable water

      Bath toys pose an interesting link between flexible plastic materials, potable water, external microbial and nutrient contamination, and potentially vulnerable end-users. Here, we characterized biofilm communities inside 19 bath toys used under real conditions. In addition, some determinants for biofilm formation were assessed, using six identical bath toys under controlled conditions with either clean water prior to bathing or dirty water after bathing. All examined bath toys revealed notable biofilms on their inner surface, with average total bacterial numbers of 5.5 × 10 6  cells/cm 2 (clean water controls), 9.5 × 10 6  cells/cm 2 (real bath toys ...

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    2. Response of simulated drinking water biofilm mechanical and structural properties to long-term disinfectant exposure

      Response of simulated drinking water biofilm mechanical and structural properties to long-term disinfectant exposure

      Mechanical and structural properties of biofilms influence the accumulation and release of pathogens in drinking water distribution systems (DWDS). Thus, understanding how long-term residual disinfectants exposure affects biofilm mechanical and structural properties is a necessary aspect for pathogen risk assessment and control. In this study, elastic modulus and structure of groundwater biofilms was monitored by atomic force microscopy (AFM) and optical coherence tomography (OCT) during three months of exposure to monochloramine or free chlorine. After the first month of disinfectant exposure, the mean stiffness of monochloramine or free chlorine treated biofilms was 4 to 9 times higher than those before ...

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    3. Role of biofilm roughness and hydrodynamic conditions in Legionella pneumophila adhesion to and detachment from simulated drinking water biofilms

      Role of biofilm roughness and hydrodynamic conditions in Legionella pneumophila adhesion to and detachment from simulated drinking water biofilms

      Biofilms in drinking water distribution systems (DWDS) could exacerbate the persistence and associated risks of pathogenic Legionella pneumophila, thus raising human health concerns. However, mechanisms controlling adhesion and subsequent detachment of L. pneumophila associated with biofilms remain unclear. We determined the connection between L. pneumophila adhesion and subsequent detachment with biofilm physical structure characterization using optical coherence tomography (OCT) imaging technique. Analysis of the OCT images of multi-species biofilms grown under low nutrient condition up to 29 weeks revealed the lack of biofilm deformation even when these biofilms were exposed to flow velocity of 0.7 m/s, typical flow ...

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    4. Roles of ionic strength and biofilm roughness on adhesion kinetics of Escherichia coli onto groundwater biofilm grown on PVC surfaces

      Roles of ionic strength and biofilm roughness on adhesion kinetics of Escherichia coli onto groundwater biofilm grown on PVC surfaces

      Mechanisms of Escherichia coli attachment on biofilms grown on PVC coupons were investigated. Biofilms were grown in CDC reactors using groundwater as feed solution over a period up to 27 weeks. Biofilm physical structure was characterized at the micro- and meso-scales using Scanning Electron Microscopy (SEM) and Optical Coherence Tomography (OCT), respectively. Microbial community diversity was analyzed with Terminal Restricted Fragment Length Polymorphism (T-RFLP). Both physical structure and microbial community diversity of the biofilms were shown to be changing from 2 weeks to 14 weeks, and became relatively stable after 16 weeks. A parallel plate flow chamber coupled with an ...

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    1-4 of 4
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  2. Topics in the News

    1. (2 articles) University of Illinois at Urbana-Champaign
    2. (2 articles) Stephen A. Boppart
    3. (1 articles) Guillermo L. Monroy
    4. (1 articles) Sunnybrook Health Sciences Centre
    5. (1 articles) Harvard University
    6. (1 articles) Kyoto University Graduate School of Medicine
    7. (1 articles) Ryerson University
    8. (1 articles) University of Toronto
    9. (1 articles) Nanjing University of Science and Technology
    10. (1 articles) Joel Ramjist
    11. (1 articles) Akitaka Tsujikawa
    12. (1 articles) Lida P. Hariri
    13. (1 articles) Victor X. D. Yang
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    Roles of ionic strength and biofilm roughness on adhesion kinetics of Escherichia coli onto groundwater biofilm grown on PVC surfaces Role of biofilm roughness and hydrodynamic conditions in Legionella pneumophila adhesion to and detachment from simulated drinking water biofilms Response of simulated drinking water biofilm mechanical and structural properties to long-term disinfectant exposure Ugly ducklings—the dark side of plastic materials in contact with potable water In Vivo and Ex Vivo Microscopy: Moving Toward the Integration of Optical Imaging Technologies Into Pathology Practice Recognition of calcified neoatherosclerosis Spectral domain optical coherence tomography as an adjunctive tool for screening Behçet uveitis Thickness of the Macula, Retinal Nerve Fiber Layer, and Ganglion Cell-inner Plexiform Layer in the Macular Hole: The Repeatability Study of Spectral-domain Optical Coherence Tomography Line-field confocal time-domain optical coherence tomography with dynamic focusing Evaluation of vascular changes in intermediate uveitis and retinal vasculitis using swept-source wide-field optical coherence tomography angiography Evaluation of retinal vasculature before and after treatment of children with obstructive sleep apnea-hypopnea syndrome by optical coherence tomography angiography Optical coherence tomography imaging of melanoma skin cancer