The value of mathematical modelling to school biotechnology is discussed to show how student's understanding of a non#x2010;trivial problem can be enhanced by mathematics. The problem reported here concerns the use of immobilized cell technology, with specific application to the detoxification of wastewaters. A mathematical model of an immobolization column is developed in four stages using no mathematics beyond GCSE level. We begin with some simple deductions about the beads used to immobilize cells and go on from inferences about the structural details of the column to construct a dynamic matrix model for the whole system. The usefulness of this modelling procedure is discussed and related to the value of such models in helping students to appreciate the temporal relations in the system.
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