2.2+Biological+Model+Systems

//**Anticipated length**//: 7 sessions of 50 minutes each

The methods developed in section 2.1 are tested using a biological model -- yeast. Yeast that lives in an “ecosystem” in sourdough starter dough, for example, includes competing and organisms that support growth of other organisms (mutualistic). Yeast in in a natural "ecosystem" can reach and sustain an equilibrium population. Sourdough starter has been reported to "live" and be useful for bread making for as long as 100 years. Yeast that is given ample food and space grows exponential but eventually the will experience population collapse due to the accumulation of waste products (carbon dioxide and ethanol). In this sub-unit, students experiment with yeast and explore the mathematics of yeast population dynamics in a biological model system.


 * Description || Materials || N.C. Essential Standards ||
 * LAB

Simple Populations Dynamics Experimentation . || ||   ||
 * LAB

Population Dynamics in an Ecosystem . || ||   || Summary of population dynamics concepts covered with yeast model. DEMONSTRATION || ||   ||
 * **LECTURE**
 * **BACKGROUND (TEACHER )** || [[file:thesourdoughmicroflorabiodiversityandmetabolicinteractions.pdf]] ||  ||
 * VIDEO:


 * SECRETS OF SOURDOUGH** || media type="youtube" key="y5xOpss4j5E" height="242" width="382" ||  ||
 * VIDEO:


 * SOURDOUGH TIME LAPSE** || media type="youtube" key="UKOOd8z__28" height="232" width="369" align="center" ||  ||
 * **HANDOUT**

SOURDOUGH TIME LAPSE . ||  ||   ||
 * **ACTIVITY**

Populations Dynamics : Predator-Prey simulation
 * .** || [[file:Exploring Population Dynamics - Predator Prey Simulation copy.docx]] ||  ||