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 13 of 13 for “"Swimming Bacteria"”.
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Motility of Swimming Bacteria Hydrodynamics and Statistics
… field of biophysics, specifically the study of swimming bacteria. Swimming microorganisms can be modeled as active particles moving at low Reynolds number (Re ≪ 1) and subject to different sources of noise. The term “active” means that they are self-propelled, while Re ≪ 1 implies that their …
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Active cellular flows: biological networks, cytoplasmic streaming and swimming bacteria
… fluid flows outside cells and focuses on bacterial locomotion. We begin by examining the fluid dynamics of rotating helical filaments, an archetypal low-Re propulsion strategy. In a classical 1976 paper, Lighthill calculated the ‘optimal’ resistance coefficients in a local resistive-force …
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Investigation of viscosity effects on bacteria collective motion using particle image velocimetry
Swimming bacteria are known to display collective motion resulting from their flagella propulsion. Various models of such collective behavior have been proposed, and different motion patterns are also well-documented. However, no previous research has investigated how contrasts in fluid viscosity …
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Two Examples of Ratchet Processes in Microfluidics
… to ratchet effects, electrophoresis, and swimming cells, topics directly related to the following chapters. The second chapter of this thesis studies the separation of charged spherical particles in various microfluidic devices. My work shows how to manipulate those particles with modified …
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An individual-based GPU simulation framework for collective bacterial dynamics in swarms and biofilms
… observations and measurements of complex bacterial communities at single-cell resolution are now possible. Guided by these rich experimental data sets, we develop minimal individual-based models to uncover the governing forces driving the dynamics in microbial systems. Our model …
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An Experimentally-validated Agent-based Model to Study the Emergent Behavior of Bacterial Communities
Swimming bacteria are ubiquitous in aqueous environments ranging from oceans to fluidic environments within a living host. Furthermore, engineered bacteria are being increasingly utilized for a host of applications including environmental bioremediation, biosensing, and for the treatment of …
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Self-organisation of confined active matter
… thesis analyses the self-organisation of dense bacterial suspensions in three different microchambers: flattened drops, racetracks and lattices of cavities. Suspensions of swimming bacteria are well-known to spontaneously form macroscopic quasi-turbulent patterns such as jets and swirls. …
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The impact of a single nucleotide polymorphism in fusA1 on biofilm formation and virulence in Pseudomonas aeruginosa
… which is characterised by highly virulent, “free-swimming” bacteria, or as a chronic infection associated with the formation of surface-adhered bacterial communities known as biofilms. The labyrinth of interconnecting signalling networks has meant that the regulatory mechanisms behind biofilm …
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Generalized Navier-Stokes equations for active turbulence
… experiments show that active fluids stirred by swimming bacteria or ATPpowered microtubule networks can exhibit complex flow dynamics and emergent pattern scale selection. Here, I will investigate a simplified phenomenological approach to 'active turbulence', a chaotic non-equilibrium …
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Bacteria in shear flow
Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent flow in rivers, streams, lakes, and oceans, as well as anthropogenic …
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Bacterial motility and growth in open and confined environments
… of a solid-liquid or liquid-air interface, bacteria can choose between a planktonic and a sessile lifestyle. Depending on environmental conditions, cells swimming in close proximity to the interface can irreversibly attach to the surface and grow into three-dimensional aggregates where the …
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Active filaments and hydrodynamic interactions in microscale propulsion
… delivery. Two important questions regarding the swimming of microorganisms and microrobots are: (i) how do they propel themselves? and, (ii) how do they interact with their environment? The work presented in this dissertation represents original research regarding both of these questions and it …
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Investigation into the surface modification of Ti-6Al-4V to facilitate antimicrobial ionic silver integration for use in implantable orthopaedic devices
… struggles to attach, creating an opportunity for bacterial adhesion. The “race for the surface” is the term given for the competition between living tissue and bacteria to colonise the implant surface. If bacterial adhesion occurs at a higher rate than tissue adhesion, the chance of infection …