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An experimental study of proton and deuteron magnetic resonance of the hydration of collagen as a function of water content, temperature, and the addition of salts has been made. From the temperature dependency of linewidths, correlation times for molecular rotation of water molecules and proton exchange times have been determined. For a water content of 45 g H 2 0 per 100 g collagen the rotational correlation time is 3 X 10-8 sec at 25 "C, with an activation energy of 4.8 kcallmole, and thedoi:10.1063/1.1671547 pmid:5772474 fatcat:7ib26jxlordotijske6lrajh6q