In most cases, you can treat microorganisms in the same way you would treat chemical species within GoldSim.
The key point to remember is that GoldSim always simulates species in terms of mass, whereas typically you will want to reference microorganisms in terms of the number of cells present. Hence, in order to simulate microorganisms, you will need to define the mass of a single cell, and enter all data in terms of the microorganism mass. You can subsequently use an element to convert results (e.g., concentrations) to be in terms of cells rather than mass
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