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By Nader Hassanzadeh

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Janse,2006 39 Motility Flagellated and other cellular movement           Flagella-mediated motility: Many Gm-ve are characterized by swimming motility mediated by flagellation. g. g. Myxococcus xanthus. Some Gm+ve bacteria including cocci are generally non-motile. BI 3206 Lecture notes 40 Gliding bacteria Morphologies of colonies formed by M . x anthus cells on rich medium after growth for five days     a) b) c) Myxococcus xanthus has two independent motility mechanisms: social motility and adventurous motility.

Gliding motility: Depends upon contact with a solid surface, it moves slowly across surfaces, involves sulfurcontaining lipids. 48 Bacterial motility Speed of movement     How fast do bacterial cells move? 00015 kilometers/hr. This may seems slow but remember their tiny size. Table demonstrates a better comparison. Paustain,2001 49 Flagellum structure  1. 2. 3. Composed of three parts: Filament: Composed of flagellin proteins twisted together in a helical conformation. Hook: Transition between filament and motor.

Chemotaxis). The flagellum's motor is much like that of, say, an electric mixer, but the mixer's is driven by electrons instead of protons. 60 Mechanism of flagellar rotatory motor and locomotion        Flagellum is propeller in action. The energy used to drive the flagellar rotation comes from the proton motive force. As a proton enters the cell through the mot complex, its energy is coupled to movement. In order to achieve a single rotation, 1000 protons must be translocated. The speed of rotation is directly proportional to the proton motive force.

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Bacterial cell structure by Nader Hassanzadeh

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