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来源:武汉光电国家研究中心     作者:    发布时间:2017年01月05日    浏览:

Entropy and enthalpy for triggering cutaneous erythema


Steven L. Jacques

Wellman Laboratories, Massachusetts General Hospital, Boston, MA, USA

Joseph T. Walsh

Wellman Laboratories, Massachusetts General Hospital, Boston, MA, USA

Harvard Medical School-M.I.T., Cambridge, MA, USA


The molar entropy (ΔS) and molar enthalpy (ΔH) for the denaturation event that triggers cutaneous erythema was determined to be ΔS = 190 J/(mole K) and ΔH = 146.9 × 103 J/mole. The experiment involved placing heated water against the skin of the forearm, for a range of temperatures and exposure times. Exposing the skin to 45°C for 22 s was at the threshold for producing erythema, which was similar to the threshold for a slight degree of pain.

Keywords: Skin; erythema; thermal; entropy; enthalpy




Read More: http://www.worldscientific.com/doi/abs/10.1142/S1793545815500261