Abstract
Heat capacities of monoclinic horse myoglobin crystals containing different amounts of water have been measured in the temperature range between 8 and 300 K. The samples containing 48.9 and 19.0 mass% of water underwent glass transitions at T g=188 and 216 K, respectively. The heat capacity increased from the rigid lattice value for T < T g to the supercooled liquid value for T > T g with concomitant spontaneous exothermic and endothermic enthalpy relaxation. The glass transition at 188 K shifted to 172 K when the sample was annealed at 230 K. The temperature drift rate due to the relaxation was analyzed to derive relaxation times as a function of the temperature and water content. The Arrhenius parameters of the relaxation time are discussed in relation to the molecular mechanism of the glass transition.
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