Wednesday, May 4, 2016

kobe BRYANt LIN Epistemic ADI

Aggregate behavior and system dynamics models can be used effectively to explore an ADI activity centered around osmosis and its role in establishing equilibrium across a semipermeable membrane. Aggregate behavior models can be used with modeling software such as SLNova and agent-based models can be constructed to look at the way a large array of individual particles produces an aggregate behavior for the entire system. System dynamics would also be effective for looking at a stable equilibrium across cell membranes, and how the concentration of solutes provides the mechanism for a feedback loop.

Students using aggregate behavior and system dynamics models can be provided with information on the way a cell membrane is formed. They will first be given an example of a feedback loop in a cell that goes to a stable equilibrium. Additional activites can be centered on asking why a cell needs this equilibrium to function. Students can be provided with a base model but also guided to construct additional models that allow them to adjust the concentrations across a membrane to observe osmosis in action. If time allows, students can also observe feedback loops in general and see what would happen if the equilibrium was unstable (i.e. a negative feedback loop vs. a positive feedback loop).

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