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Mechanisms of Timing and Control

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Published on Jul 16, 2011

025 - Mechanisms of Timing and Control

Paul Andersen explains how organisms regulate timing and control. Phototropism and Photoperiodism allow plants to respond to light throughout the day and year. Circadian rhythms are used in all organisms (including animals) as an internal clock. Bacteria use quorum sensing to communicate the number of bacteria present.

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All of the images are licensed under creative commons and public domain licensing:
"File:3G6O.pdb.jpg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:3G6....
"File:Arabidopsis Thaliana.jpg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Ara....
"File:Bahrain b747sp-21 a9c-Hmh Arp.jpg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Bah....
"File:Biological Clock Human.svg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Bio....
"File:Circadian Rhythm Labeled.jpg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Cir....
"File:Indol-3-Ylacetic Acid.svg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Ind....
"File:Phototropism.jpg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Pho....
"File:Phytochrome Absorbtion.png." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Phy....
"File:Weihnachtsstern - Groß.jpg." Wikipedia, the Free Encyclopedia. Accessed November 24, 2013. http://en.wikipedia.org/wiki/File:Wei....
"Pictures of International Date Line." Ookaboo: Free Pictures of Everything on Earth. Accessed November 24, 2013. http://ookaboo.com/o/pictures/topic/5....
UpstateNYer. English: Common Dandelion, a Weed; This Specimen Found in Upstate New York, May 6, 2009. Own work. http://commons.wikimedia.org/wiki/Fil....
Vaccaro, Alberto. Jet Lag, January 9, 2008. http://www.flickr.com/photos/gin_fizz....

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