While not common in an industrial bioprocess, there are systems in which growth rate can be
limited by more than one nutrient. For example, a waste treatment unit could have feed rich in
carbohydrates and low in nitrogen and later be faced with feed low in carbohydrates and rich in
nitrogen. The nutrient in lowest proportion would change, and there may be transitions during
which more than one is below a concentration that would give no rate limitation. We can also
envision a process operated intentionally at low concentration of nitrogenous nutrients to
restrict growth and at low sugar concentration to favor a particular pathway.
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