The efficiency of propulsion by a rotating flagellum
AUTOR(ES)
Purcell, Edward M.
FONTE
The National Academy of Sciences of the USA
RESUMO
[At very low Reynolds number, the regime in which fluid dynamics is governed by Stokes equations, a helix that translates along its axis under an external force but without an external torque will necessarily rotate. By the linearity of the Stokes equations, the same helix that is caused to rotate due to an external torque will necessarily translate. This is the physics that underlies the mechanism of flagellar propulsion employed by many microorganisms. Here, I examine the linear relationships between forces and torques and translational and angular velocities of helical objects to understand the nature of flagellar propulsion.]
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=23452Documentos Relacionados
- Efficiency of Glasshouse Pot Experiments Rotating versus Stationary Benches
- Studies of efficiency in a perforated rotating disc contactor using a polymer-polymer aqueous two-phase systems
- Forces generated during actin-based propulsion: A direct measurement by micromanipulation
- Posttranscriptional regulation of Caulobacter flagellin genes by a late flagellum assembly checkpoint.
- Propulsion of African trypanosomes is driven by bihelical waves with alternating chirality separated by kinks