Through the microscope, we observe the E. coli bacterial flagellum. The bacterial flagellum is what propels E. coli bacteria through its microscopic world. It consists of about 40 individual protein parts including a stator, rotor, drive-shaft, U-joint, and propeller. It's a microscopic outboard motor! The individual parts come into focus when magnified 50,000 times (using electron micrographs). And even though these microscopic outboard motors run at an incredible 100,000 rpm, they can stop on a microscopic dime. It takes only a quarter turn for them to stop, shift directions and start spinning 100,000 rpm in the opposite direction! The flagellar motor has two gears (forward and reverse), is water-cooled, and is hardwired into a signal transduction (sensory mechanism) so that it receives feedback from its environment.
2007-07-19
13:16:23
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14 answers
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asked by
J Jacob
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