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- W2189085756 abstract "To avoid any misunderstanding, it is worth noting here the definite distinction between flagellum (prokaryotic) and cilium (eukaryotic). The two structures only have in common the fact that they are thin mobile protrusions with a precise and stable organization, and also a definite position in the cell (unlike, for example, the pseudopods of eukaryotic cells which may change, be reabsorbed and sent out again in different positions). Apart from these common characteristics, the two structures differ in every particular aspect. The flagellum is much thinner and extracellular, as at the level of the plasma membrane it only has its basal body, whereas the cilium is intracellular, and is therefore covered by the plasma membrane for the whole of its extended portion (Fig. 4.1). Furthermore, the former is passive and only rotates at its base, whereas the latter bends laterally along its full length or part of it and is immobile at its base; the former exploits the inflow of hydrogen ions41(or sodium ions in rare cases42) as its source of energy for motion at the level of its rotary motor, whereas the latter exploits energy delivered by ATP hydrolysis, according to the usual scheme: that energy produces bending at the point at which it is delivered. In addition, the constituent proteins differ completely: they are flagellin, virtually alone, for the extended portion of the flagellum, i.e. its filament, whereas the cilium has many proteins, a few of which give rise to a contractile system (Section 11.1). All these differences also imply radically different morphogenesis." @default.
- W2189085756 created "2016-06-24" @default.
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- W2189085756 date "2000-01-01" @default.
- W2189085756 modified "2023-09-25" @default.
- W2189085756 title "Prokaryotes: The Flagellum" @default.
- W2189085756 doi "https://doi.org/10.1007/978-3-0348-8668-0_4" @default.
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