An electrophoretic separation medium which is composed of a gel solution and contains a water-soluble polymer.
A gel holder, which is provided with stopper members and thus can hold even soft or slippery gels while maintaining a fixed shape thereof.
A slab type electrophoretic apparatus, which permits automatic detection of the electrophoretic state of a sample, automatic completion of the electrophoresis under optimum conditions without setting measurement conditions, permits continuous measurement of the buffer solution temperature, and permits separation and purificiation of a large quantity of an enzyme or like physiologically active substances.
An electrophoretic gel cutter, which can cut even large size electrophoretic gels very accurately and safely to desired sizes and particularly for soft and readily deformable electrophoretic gels of polyacrylamide or the like without causing damage to the gel.