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SEM images of coll HA composite a, d control - no electric field is applied b, e pulsatory electric field is applied, 0,93 V cm, frequency 1 Hz c, f superposed electric field 0,67 V cm direct electric field and 0,93 V cm and 1Hz pulsatory electric field The mineralization process of collagen gels leads to composite materials with a structure similar to that of spongy bone Fig. 17a, d , without any orientation of the collagen fibers. If a pulsatory electric field is applied the collagen...