Using a RIfS set up made by our laboratory we have investigated the kinetic behavior of bovine serum albumin (BSA), human fibrinogen (FIB) and human IgG adsorbed onto surfaces of hydroxyapatite and polyurethane H50 50. According to the principle of operation of RIfS and the molecular dimensions of three kinds of proteins we introduced a formula to calculate the adsorbed layers of proteins onto hydroxyapatite and polyurethane H50 50. The results show that the adsorbed layers of three kinds of proteins on ...