Lecture 6 - BME 418 Quantitative Cell Biology Alan J Hunt...

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BME 418, Quantitative Cell Biology Alan J. Hunt Lecture #6: Momentum and Reynolds #, Introduction to Eukaryotic Cells, intracellular organelles. Before we leave the prokaryotes and begin discussion of eukaryotes, we'll touch on one more issue concerning bacterial motility: the effect of momentum. It's very informative to consider how far a bacterium will coast after it stops swimming.
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BME 418, Quantitative Cell Biology Alan J. Hunt A bacterium coasts for a distance much shorter than the diameter of a hydrogen atom! So, for a bacterium, it's as if acceleration and momentum do not exist. For practical purposes it immediately moves full speed upon beating it's flagella, and immediately comes to a stop when beating stops. What about other small objects? Is there some generalized way to decide the importance of momentum? Yes, the Reynold's number: Reynold's # η ρ vL = L is the size (radius for a sphere) ρ is the specific gravity (density for practical purposes). For a bacterium Reynold # 10 -5 For a fish 10 5 Another ramification of high Reynolds #: there may be turbulence. In this case Stokes' would not apply. Discuss springs and waves at low R.
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BME 418, Quantitative Cell Biology Alan J. Hunt Now we turn from the prokaryotes to a group of organisms that appeared more recently on the planet, somewhere around 1.5 billion year ago from fossil records. The eukaryotes
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This note was uploaded on 09/06/2008 for the course BIOMEDE 418 taught by Professor Hunt during the Winter '08 term at University of Michigan.

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Lecture 6 - BME 418 Quantitative Cell Biology Alan J Hunt...

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