Difference between revisions of "Chemotactic Patterns without Chemotaxis"

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(New page: Entry: Chia Wei Hsu, AP 225, Fall 2010 M.P. Brenner, Chemotactic Patterns without Chemotaxis, Proc. Natl. Acad. Sci, '''107''', 11653–11654 (2010).)
 
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M.P. Brenner, Chemotactic Patterns without Chemotaxis, Proc. Natl. Acad. Sci, '''107''', 11653–11654 (2010).
 
M.P. Brenner, Chemotactic Patterns without Chemotaxis, Proc. Natl. Acad. Sci, '''107''', 11653–11654 (2010).
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== Summary ==
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This commentary addresses the study by Cates et al (ref 1) where an effective model is used to describe the pattern formation in chemotaxis. In particular, the effective model ignores the details of the chemotactic mechanisms but focuses on averaged effect, thus greatly reducing the complexity of the modeling. Brenner uses this study as an example to show the promise of using effective models to understand biological systems.
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== Pattern Formation in Chemotaxis ==
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Chemotaxis is the phenomenon where bacteria and other organisms direct their motion based on the environment. For example, bacteria can swim up the food concentration gradient to get to a region with more food, or swim down the poison concentration gradient to avoid poisoning.
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<!--The fundamental idea is that bacteria perform biased random walks, in which “runs,” periods in which the bacteria swim straight with constant velocity <math>v</math>, are interrupted by “tumbles,” in which the bacteria turn randomly. By measuring a time-weighted average of chemo-attractant binding to their receptors, bacteria such as E. coli can modulate changes in the frequencies of run and tumble and hence control ascent of a gradient.-->
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The chemotaxis phenomenon results in pattern formation. Is has been found that (ref 2) when chemotactic bacteria swim through a small tube of rich medium, the bacteria form a dense band that moves at constant velocity.
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== Effective Model ==
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== Connection to Soft Matter ==
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== References ==
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[1] Cates ME, Marenduzzo D, Pagonabarraga I, and Tailleur J, "Arrested phase separation in reproducing bacteria: A generic route to pattern formation," Proc Natl Acad Sci USA '''107''', 11715–11720 (2010).
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[2] Adler J, "Chemotaxis in bacteria," Science '''153''', 708–716 (1966).

Revision as of 19:35, 3 October 2010

Entry: Chia Wei Hsu, AP 225, Fall 2010

M.P. Brenner, Chemotactic Patterns without Chemotaxis, Proc. Natl. Acad. Sci, 107, 11653–11654 (2010).

Summary

This commentary addresses the study by Cates et al (ref 1) where an effective model is used to describe the pattern formation in chemotaxis. In particular, the effective model ignores the details of the chemotactic mechanisms but focuses on averaged effect, thus greatly reducing the complexity of the modeling. Brenner uses this study as an example to show the promise of using effective models to understand biological systems.


Pattern Formation in Chemotaxis

Chemotaxis is the phenomenon where bacteria and other organisms direct their motion based on the environment. For example, bacteria can swim up the food concentration gradient to get to a region with more food, or swim down the poison concentration gradient to avoid poisoning.

The chemotaxis phenomenon results in pattern formation. Is has been found that (ref 2) when chemotactic bacteria swim through a small tube of rich medium, the bacteria form a dense band that moves at constant velocity.

Effective Model

Connection to Soft Matter

References

[1] Cates ME, Marenduzzo D, Pagonabarraga I, and Tailleur J, "Arrested phase separation in reproducing bacteria: A generic route to pattern formation," Proc Natl Acad Sci USA 107, 11715–11720 (2010).

[2] Adler J, "Chemotaxis in bacteria," Science 153, 708–716 (1966).