esides, G. M., Angew. Chem. hit. Ed. Engl., 1979, .18, 377.392. 105. "Preparation and Magnetic Filtration of Polyacrylamide Gel Beads Containing a Ferrofluid and Covalently Immobilized Proteins", Adalsteinsson, 0., Lamotte, A., Baddour, R. F., Colton, C. K., Pollak, A. and Whitesides, G. M., J. Mot. Cat,