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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.
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.