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 15 of 15 for “"biological physics"”.
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Phenomenological models in biological physics : cell growth and pluripotency maintenance
… challenge in quantitatively modeling a biological system is that the system often involves many components and just as dizzying number of interactions among those components. To further complicate matters, the parameters that characterize those interactions and components, like the rates …
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Biological Physics of Collective Motion: Circular Milling in Symsagittifera roscoffensis and Related Questions of Self-Organisation
Collective motion, a phenomenon resulting from the interactions of many individuals, occurs across the natural world across all length scales, from the flocking of birds to the swirling of Bacillus subtilis bacteria. Understanding these phenomena is critical to understanding how the organism …
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Biophysical Applications of Single Molecule Fluorescence Localization
… a powerful tool for investigating problems in biological physics. However, there are numerous limitations on the types of measurements that can be made with typical instrument designs based on objective-type TIR and wide field CCD imaging. We present several novel applications of single …
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Studies of Protein-Protein and Protein-Water Interactions by Small Angle X-Ray Scattering, Terahertz Spectroscopy, ASMOS, And Computer Simulation
… has been one of the most challenging subjects in biological physics due to its complexity. Energy landscape theory based on statistical mechanics provides a thermodynamic interpretation of the protein folding process. We have been working to answer fundamental questions about protein-protein and …
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Physics of Self-assembly in Complex Matter
… studying complex matter in multiple areas of biological physics. While the complex matter systems in each area differ vastly in scale and function, I use similar computational approaches on each to answer scientific queries about their structure and dynamics. In the first and second sections, …
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Statistical Mechanics of Two-Dimensional Materials; From Biological Membranes to Graphene
… ranging from electronics, energy harvesting, biological systems among others. Due to the 2D nature of these materials, they are known for their unusual flexibility and the ability to sustain large curvature deformations. Further, they undergo noticeable thermal fluctuations at room …
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Stokes flows near boundaries: bacteria, corners, and pumps
… bacteria near boundaries which are ubiquitous in biological systems. A bacterium such as \textit{Escherichia coli} is equipped with a number of rotary motors on its surface. Every motor has a helical flagellum attached to it and by rotating these motors the bacterium can move the fluid. We …
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Theoretical and Experimental Atomic Force Microscopy Investigations of Staphylococcus aureus
Staphylococcus aureus causes many infections that affect the human population. The majority of infections are caused by S. aureus strains that express either serotype 5 or 8 capsular polysaccharides. Atomic force microscopy (AFM) was used to investigate three serotypically different S. aureus …
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Neutron scattering studies of water diffusion near the interface of model cell membranes
… remain some of the most fundamental issues in biological physics today. Single-supported lipid bilayers (SSLBs) provide model systems for investigating their structural and dynamical properties via atomic force microscopy (AFM) and quasielastic neutron scattering (QENS), respectively. QENS …
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Propulsion, navigation and control of biological and artificial microswimmers
… different types of microswimmers, including both biological microorganisms and artificial colloids. Due to the physical constraints imposed by the inertialess hydrodynamics at these small scales, these swimmers rely on multiple locomotion strategies that are unfamiliar from the macroscale. The …
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Complex networks in the climate system
… interest for a broad audience within the physics community and various applied fields, because it is universal in the sense of being valid for any spatially extended dynamical system. It can help to understand the localized flow of dynamical information in any such system by combining …
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Multiscale dynamics in honeybee societies
In this dissertation, I examine the social organization of a model organism, the honeybee, at multiple scales. I begin in Part I at the microbial scale, by studying the relationship between the social caste of individuals and the microbes they harbour in their gastrointestinal tracts. Using 16S …
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Modelling Physical Mechanisms Driving Tissue Self-Organisation in the Early Mammalian Embryo
In the mammalian embryo, between 3.5 and 4.5 days after fertilisation, the cells of the inner cell mass evolve from a uniform aggregate to an ordered structure with two distinct tissue layers - the primitive endoderm and epiblast. It was originally assumed that cells differentiated to form these …
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Transport of active particles in complex environments
Many biological systems are comprised of active particles, that is entities which move by consuming energy from their environment such as flocks of fish, cell tissues or bacterial swarms. The interaction of active particles with each other or complex environments, such as porous media and chemical …
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Activation processes in biology
Many processes in physics and biology can be understand through the framework of escape from a metastable state, including (but not limited to) the rates of chemical reactions, the unfolding of proteins, the nucleation of bubbles, and the condensation of gases. To understand the kinetics of these …