Low-temperature specific heat of a globular protein: human serum albumin
B. I. VerkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovYu. P. Blagoı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovA. M. GurevichPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. N. EropkinPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
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The specific heat of a globular protein—human serum albumin with a water content of 6−10 wt. %—is measured in the temperature range 1.8−25 K. Below 4 K the specific heat is described by the sum of a cubic term and a linear term with respect to the temperature; the linear contribution to the specific heat is dominant below 1 K. This type of function C(T) corresponds to the glassy protein model proposed by Gol’danskii et al. A singularity of the specific heat is observed in the temperature interval 2.6−4.1 K. The presence of several specific-heat maxima can be attributed to structural changes taking place in the protein globule.
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