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 20 of 797 for “"Biofilm"”.
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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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Biofilm Formation by Moraxella Catarrhalis
This is the first detailed study of biofilm formation in vitro by the Gram-negative bacterial pathogen Moraxella catarrhalis. Growth of M. catarrhalis in a continuous-culture biofilm system resulted in little detectable change in outer membrane protein production compared to broth-grown M. …
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Biofilm formation on metal surfaces
The development of biofilms on mild and stainless steel surfaces in pure and mixed batch cultures of the bacterial species Pseudomonas fluorescens and Desulfovibrio desulfuricans and the role of these biofilms in corrosion of steel has been investigated. Early events leading to the formation of …
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Removal of Biofilm through Controlled Cavitation
… with cavitation bubbles to remove the bacterial biofilm.</p> <p>This thesis includes the various experiments done with respect to removal rate for varying parameters (i.e. depth, sonication time, etc). Discussion is presented as to advantages and possible limitations.</p> <p>The advantages of …
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Biofilm Removal Using Bubbles and Sound
Bacteria in biofilms adhere well to surfaces and are quite difficult to remove. Oral plaque is one example of a biofilm. Many researchers have studied ways to remove plaque and bacteria from surfaces. It has been found that the passage of a bubble across a surface to which bacteria has adhered can …
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Exoelectrogenic biofilm growth in shearing flows
Microbial biofouling occurs when a biofilm adheres to materials involved in liquid transport causing economic loss through corrosion and drag losses on ship hulls, and in oil and food distribution. Microorganisms interacting with surfaces under these open channel flows contend with high shear rates …
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Mathematical Models of Biofilm in Various Environments
Microbial biofilms are defined as clusters of microbial cells living in self-produced extracellular polymeric substances (EPS), which always attached to various kinds of surfaces. In this thesis, we studied several mathematical models of biofilm in the human body and marble environment. Some …
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Experimental evolution of Burkholderia cenocepacia biofilm populations
<p>Many biofilm populations are known for their exceptional biodiversity but the relative contributions of the forces that could promote this diversity are poorly understood. This uncertainty pervades in the well-established communities found on many natural surfaces and in long-term, chronic …
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Denitrification Under Salinity Stress in Biofilm Reactors
… process’ performance under salinity inhibition, biofilm reactors could represent an elegant strategy, but a systematic analysis focusing on the reactor system under salinity stress is needed for their optimisation. Moreover, since the electron donors available for the process may vary, the …
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Biofilm Removal with Acoustic Cavitation and Lavage
<p>Bacterial biofilm colonies attached to orthopedic implants, and surrounding tissues resist to antibiotic treatments, prolong hospitalization, increase mortality, and usually require the removal and replacement of the entire joint. Through acoustic cavitation, it could be possible to remove the …
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Mathematical Modelling of Mechanisms for Biofilm Expansion
Biofilms are multi-cellular communities of microorganisms attached to surfaces. It has been estimated that about 99% of all bacteria exist in biofilm. Thus to understand the critical role bacteria play in natural and man-made ecosystems, requires a better knowledge of these multi-cellular …
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Biofilm formation and virulence of Streptococcus pneumoniae
… of distinct virulence phenotypes. Formation of biofilms is an important step in pneumococcal pathogenesis, as they serve as reservoirs of infection and organisms within biofilms are resistant to antimicrobials and host immune defences. The aim of this work was to extend our understanding of the …
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Shigella Boydii 18: Characterization and Biofilm Formation
… cells. Shigella boydii may be forming a biofilm on the surface of the parsley, which may explain why produce wash is effective against S. boydii planktonic cells, but ineffective against S. boydii on parsley. Scanning electron micrographs and environmental scanning electron micrographs …
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Modeling for anaerobic fixed-bed biofilm reactors
Biofilm models, developed by previous researchers, were incorporated with an equilibrium model to study the physical and chemical aspects of the anaerobic fixed-bed biofilm reactors. In order to investigate the mechanism of equilibrium in an anaerobic biofilm reactor, a non-equilibrium model was …
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Computational Modeling of Planktonic and Biofilm Metabolism
… ubiquitously able to live in both planktonic and biofilm states, which can be applied to dissolve the energy and environmental issues (e.g., producing biofuels and purifying waste water), but can also lead to serious public health problems. To better harness microorganisms, plenty of studies have …
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Nitrification of Landfill Leachate by Biofilm Columns
… landfill leachate using trickling filter biofilm technology was studied in four laboratory scale reactors filled with four different types of packing media. The different packing media were examined to see which media is the most efficient at supporting ammonia removal biofilms. The …
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Biodegradation, surface rugosities and biofilm coverage of biopolymers
… and P(HB-co-HV) attracted a higher coverage of biofilm than the slower degrading polymers PHO, PDLL and PDLLG for both the in vitro and in vivo experiments. The non-degradable polymers (EC and polystyrene) attracted no biofilm. In vitro and in vivo experiments demonstrated a positive correlation …
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Effects of Surface Topography on Bacterial Biofilm Formation
<p>Biofilms are multicellular structures with bacterial cells attached to a surface and embedded in an extracellular matrix. With high-level resistance to antimicrobial agents, biofilms are the cause of chronic infections associated with implanted medical devices such as breast implants, orthopedic …
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Effects of substrate stiffness on bacterial biofilm formation
<p>Biofilms are communities of microbial cells attached on surfaces and embedded in a self-produced extracellular matrix comprised of polysaccharides, DNA, and proteins. Biofilms of pathogenic bacteria cause serious chronic infections due to high tolerance to antibiotics and host immune systems …
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