Lecture3 Bacterial Chemotaxis

Lecture3 Bacterial Chemotaxis - Bacteria and Viruses...

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Microbs Bacteria and Viruses Microbs Microbs Some bacteria, such as E. coli, have several flagella per cell (4–10 typically). These can rotate in two ways : Counter-clockwise rotation aligns the flagella into a single rotating bundle, causing the bacterium to swim in a straight line. Clockwise rotation breaks the flagella bundle apart such that each flagellum points in a different direction, causing the bacterium to tumble in place. The directions of rotation are given for an observer outside the cell looking down the flagella toward the cell. Microbs Chemotaxis videos http://www.metacafe.com/watch/318022/chemotaxis/ http://tw.youtube.com/watch?v=Ql7i_TLUurM Microbs A response of motile cells or organisms in which the direction of movement is affected by the gradient of a diffusible substance. Differs from chemokinesis in that the gradient alters probability of motion in one direction only, rather than rate or frequency of random motion . Chemotaxis
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This note was uploaded on 03/12/2012 for the course BIOL 0126 taught by Professor Wux. during the Winter '11 term at HKU.

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Lecture3 Bacterial Chemotaxis - Bacteria and Viruses...

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