Find the gradient of the function 
Definitions:
Biological pH
A measure of the hydrogen ion concentration within biological systems, critical for maintaining life's biochemical processes.
Aqueous Solution
A solution in which the solvent is water.
Electrophoresis
A laboratory technique used to separate macromolecules like DNA or protein based on their size and charge.
Cathode
The electrode in a battery or electrolytic cell where reduction occurs; it attracts cations.
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