[Study of the diffusion of water absorbed on proteins by the ESR methods using a new magnetic field impulse gradient program]

Modification of the program of impulse gradient removing anomalous suppression of the echo at small time intervals between gradient impulses is presented. The results are given of measuring the diffusion of water adsorbed on bovine serum albumin. An efficient diffusion coefficient for 20 degrees C is evaluated as 2.4.10(-6) cm2 sec at the activation energy in the temperature range 5 divided by 40 degrees C for 0.42 g H2O/g of protein and 20 divided by 50 degrees C for 0.22 g H2O/g of protein equal to 6.5 kcal/mol.