Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"biofilm structure"”.
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Dynamics of Biofilm Structure
… is associated with a developmental state of the biofilm. By following the fingerprints of images over time, we visualize the dynamic developmental history of the biofilm.
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Influence of Indole and Mixed Culture Growth on Pseudomonas Aeruginosa Biofilm Structure
… multitudes of aggregates within surface-attached biofilm communities. The discovery of this sessile lifestyle has had a resounding effect on the scientific community and the approach toward studying anti-microbial resistance (AMR). Past studies showed that quorum sensing (QS) mutants of …
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Headwater Stream Biofilm Structure and Function at High Resolution Spatial-temporal Scales.
… the stability and resilience of benthic biofilms, in particular their ability to discriminate nutrient pressures between catchments, even in dynamic streams. Investigation of how diatom community attributes (diversity and chlorophyll-a) varied in relation to one another was explored …
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The effects of low-level pharmaceuticals on stream biofilm structure and function across a land-use gradient in streams of the Huron River watershed
… have not been fully explored. We used stream biofilms to assess ecosystem responses to PPCPs. Biofilms were cultivated in streams draining areas of different land use and then exposed to triclosan, diphenhydramine, and sulfamethoxazole-trimethoprim treatments. We found evidence that low levels …
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Role of Extracellular Polymeric Substances (EPS) on Biofilm Disinfection in a Model Drinking Water Distribution System
Biofilms are undesirable but ubiquitous in drinking water systems. This study investigated the role of extracellular polymeric substances (EPS) in the biofilm life cycle, including planktonic cells, attached biofilm, detached biofilm clusters and redistributed biofilm, in a model distribution …
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Design of a microfluidic device for the analysis of biofilm behavior in a microbial fuel cell
… microbial fuel cell. A model was developed for biofilm behavior incorporating shear and pore pressure as mechanisms for biofilm loss. The model agrees with experimental observations on fluid flow through biofilms, biofilm structure, and other biofilm loss events.
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The role of biofilms in Legionella pneumophila transmission in drinking water distribution system
Biofilms in drinking water distribution systems (DWDS) or premise plumbing systems could facilitate the persistence and transmission of pathogenic Legionella pneumophila (L. pneumophila), thus raise human health concerns. L. pneumophila cells can accumulate in biofilms, be protected from …
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The impact of abiotic and biogenic mn oxide coatings on contaminant mobility, bioavailability, and attenuation
… on montmorillonite were studied for formation, structure, stability, and surface properties. Coatings dominated the clay surface characteristics where the surface charge behaved similar to that of the discrete oxide and the local structure was consistent with the pure oxide phase. Furthermore, …
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Particle tracking for understanding the properties and dynamics of bacterial biofilms
Bacterial biofilms consist of surface adherent bacteria that surround themselves with a polymer matrix which provides environmental protection and antibiotic resistance. Biofilms can grow on most implanted medical devices, on heart valves, and in the lungs of patients with cystic fibrosis, …
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Characterization and control of biofilm and biofluid microstructure and rheology
… cells can sometimes form and thrive within biofilms, a community of cells embedded in a self-produced extracellular polysaccharide (EPS) matrix. The EPS gives biofilms three-dimensional structures, protecting cells in biofilms by making them more resistant to chemical and physical attack. It …
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Photodynamically Activated Multifunctional Chitosan Nanoparticles to Disinfect and Improve Structural Stability of Dentin
… is the ability of bacteria to persist as biofilms within the anatomical complexities of the root canal system. In addition, the alterations in the ultrastructure of dentin tissue results in compromised structural integrity of root dentin leading to higher risk of fracture in root-filled …
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Consequences of redox-active phenazines on the physiology of the opportunistic pathogen Pseudomonas aeruginosa
… in numerous physiological changes, including biofilm development. Phenazines have been proposed to aid catabolism of P. aeruginosa under conditions like those found in biofilms-rich in nutrients but low in suitable respiratory oxidants, e.g., oxygen and nitrate-and phenazines are known to …
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An investigation of biosurfactant-mediated disruption and biological activity in mature biofilms formed on plastic surfaces by LPS mutants of Salmonella enterica serovar Typhimurium
… a major foodborne pathogen. Its ability to form biofilms (a community of microorganisms) contributes to contamination in the food industry and clinical environments, posing challenges for disinfection and increasing the risk of spread. Biosurfactants, compounds produced by microorganisms, can …
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The Role of the Extracellular Matrix components of Salmonella enterica serovar Typhimurium Biofilms in Biofilm Formation and Architecture via in vitro analysis
Biofilms are aggregates of bacterial cells enclosed within a self-generated extracellular matrix, forming a three-dimensional structure that allows the bacteria cells to firmly attach to both living and non-living surfaces. The extracellular matrix of Salmonella enterica serovar Typhimurium (STm) …
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HIDDEN IN THE COAT: GEOMICROBIOLOGICAL INVESTIGATIONS OF ROCK ART ECOSYSTEMS AND CHALLENGES FOR THEIR SUSTAINABLE PRESERVATION
… color of rock art surfaces. We visualized the biofilm structure and extracted genomic material on rock art samples with different colored coatings from Ethiopia, then identified bacterial communities by amplifying and sequencing the 16S rRNA gene. Bacteria with mineralization potentials that …
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Dental caries prophylaxis with photosensitizers (experimental, laboratory and clinical studies) // Профилактика на зъбния кариес с фотосенсибилизатори (експериментални, лабораторни и клинични изследвания)
… human population. Diseases related to microbial biofilms are one of the most prevalent bacterial diseases in humans. The process of destruction of hard dental tissues due to dental caries is part of these conditions of disturbed ecological balance. The role of Mutans Streptococci (MS) and …
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Antibiofilm properties of selected Lactobacillus species and their mechanism of action against Listeria monocytogenes
… by the fact that L. monocytogenes forms biofilms, one very powerful virulence mechanism, that adhere to processing surfaces. The shortfall of commonly used antibiotics and sanitizers as treatment against L. monocytogenes biofilms due to antimicrobial resistance leads to a major safety …