Activator-Inhibitor. A Model of Biological Pattern Formation
Description
| Title | Activator-Inhibitor. A Model of Biological Pattern Formation |
|---|---|
| Duration | 13 mins 16 secs |
| Collection | IWF Knowledge and Media GmbH |
| Language | |
| Country View on map | |
| Director | |
| Subjects | |
| Terms of Use | more… |
Description
In the development of higher organisms, pattern forming reactions must be involved. In the movie, a yet hypothetical two-component reaction is analysed which is able to generate patterns. Computer simulations made on the basis of two coupled non-linear differential equations show the time course and the regulatory properties of this reaction.Credits
Year of publication: 1985
Segments
?Segment 1
Starts: 0:00
(5:34)
Just as higher organisms develop characteristics which are not in the fertilised egg, so deep valleys are formed by rain which is evenly distributed over the landscape. This is because small variations have an effect which self-amplifies. How this process occurs is shown with graphs, graphics and formulae.
Segment 2
Starts: 5:34
(3:38)
Computer simulations of the patterns that can occur. Initiation of Pattern Fomation by Random Fluctuation. Regeneration with Polarity Reversal. Induction of a Second Activator Maximum. Unspecific Induction by Inhibitor Removal. Oscillator Patterns Generated by a Long-Living Inhibitor.
Segment 3
Starts: 9:12
(4:04)
Chemotactic Orientation of a Cell. Generation of a Gradient in a Two-Dimensional Field. Periodic Patterns in Extended Fields. Formation of Regular Patterns During Growth: Phyllotaxis. Credits.
Explanation of the Zhabotinsky Reaction
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