Abstract: A golf club (10) is configured to dissipate kinetic energy during the impact when striking the golf ball, thereby to reduce the quantum of kinetic energy transferred from the golf club (10) to the ball and reducing the distance that the ball travels. The reduction in ball travel encourages the player to use more concentric muscle action at the moment of impact and thus to have better control over the impact. The golf club (10) includes a shaft (18) and a head (14) and the head (14) comprises a support structure (22) that is connected to the shaft (18), and an impact absorbent structure (16) that defines a face (46) of the golf club (10). The impact absorbent structure (16) includes a cushion (48), disposed between the face (46) and the support structure (22) and the cushion (48) is made of a shear thickening material.

Abstract: Hepatic fibrosis or necrosis is diagnosed in vivo by administering a complex of a polymer having calcium-chelating phosphonate groups with radionuclide ions and comparing the degree of retention of the polymer in the diseased liver with that of normal patients. The preferred complex is of Tc-99m polyethyleneiminomethyl phosphonate.