Издательство: | Книга по требованию |
Дата выхода: | июль 2011 |
ISBN: | 978-3-6391-0277-2 |
Объём: | 204 страниц |
Масса: | 331 г |
Размеры(В x Ш x Т), см: | 23 x 16 x 2 |
Bacteria like Escherichia coli and Salmonella Typhimurium use flagella for locomotion. Each flagellum is run by a motor located in the cell body, with a long slender filament of 0.01-0.015mm long and 20nm in diameter attached to this motor. A swimming bacterium has all its filaments helical in shape involving a frequent change of their chirality, pitch and radius. To explain polymorphism, a new coarse-grained continuum rod theory with two molecular switches based on the quaternary structure of the filament is proposed. A phase diagram for filament shapes is calculated and the response of a filament to external moment and force is examined. To study the dynamics of the propagation of polymorphism in the filaments, a toy model with an external tensile shear fluid flow applied to a bistable cantilever 1D rod was modeled on the lines of phase transitions and simulations is performed using finite element techniques. Interesting results like nucleation of high-strain phase leading to either a trapped front separating two phases or uniform high-strain phase at steady state are observed.
Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.