docshah
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I am reading from Kaplan notes that Listeria has a tumbling motility. What the heck does Tumbling mean? I mean, it is motile but whats with the tumbling??? :idea:
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| docshah
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Other Bacteria are motile but there is no tumbling involved. What does it mean if Listeria is defined as such? Do we see something specific on the slides?
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| mash
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A motile bacteria propels itself from place to place by rotating its flagella. To move forward, the flagella rotate counterclockwise and the organism "swims". But when flagellar rotation abruptly changes to clockwise, the bacterium "tumbles" in place and seems incapable of going anywhere. Then the bacterium begins swimming again in some new, random direction.
Swimming is more frequent as the bacterium approaches a chemoattractant (food). Tumbling, hence direction change, is more frequent as the bacterium moves away from the chemoattractant. So it is a complex combination of swimming and tumbling that keeps them in areas of higher food concentrations
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| docshah
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Thank you very much!! Such an awesome description!!!
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| Sakaki-
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Don't all motile bacteria "tumble" in search of a chemoattractant? Is it just that Listeria "tumbles" more than the others?
Anyways, motility would be seen on a wet prep from a broth.
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