This thesis considers the possibility of stochastic resonance (SR) in the following nanoscale systems:
(i) hard-threshold devices; (ii) averaging structures of carbon nanotubes (CNTs); (iii) myoglobin atoms; and finally (iv) tubulin dimers. The description of SR is carried out using Kramers' rate theory in the adiabatic two-state approximation for continuous systems and using Shannon's information theoretic formalism for systems with static nonlinearities. The effective potentials are modelled by asymmetric or symmetric bistable wells in a single reaction co-ordinate. Quantum considerations have not been invoked. Hence, all results are implicitly valid in the high-temperature regime of relevance to industrial applications.
It is established that information transmitted by arrays of identical CNTs is maximized by non-zero noise intensities and that the response of myoglobin and tubulin dimers to ambient molecular forces (as described by the signal-to-noise ratio or SNR) is enhanced by increasing temperature. Sample calculations are shown for solvent fluctuations, ligand interactions and dipole oscillations. These results can be used to explain: (i) the effects of temperature observed in fabrication processes for CNTs;
(ii) the dynamical transition observed in myoglobin and (iii) the 8.085 MHz resonance observed in microtubules.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/1686 |
| Date | 06 1900 |
| Creators | Saha, Aditya |
| Contributors | Tuszynski, Jack A., Morsink, Sharon (Physics), Marchand, Richard (Physics), Hillen, Thomas (Math. and Stat. Sciences), Kouritzin, Michael (Math. and Stat. Science), Mogilner, Alex (External reader, University of California, Davis) |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 2468452 bytes, application/pdf |
| Relation | A. A. Saha and J. A. Tuszynski, Adv. Media and Comm. Research 6, 122-156, (2010), A. A. Saha and J. A. Tuszynski, Jl. Comput. and Theor. Nanoscience, 8, 1-9 (2011), A. A. Saha and J. A. Tuszynski, Jl. Biol. Phys. (to appear), A. A. Saha, T. J. A. Craddock and J. A. Tuszynski, Biosystems (submitted) |
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