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The heat capacity of lipid membranes in finite reservoirs and the relation to the frequency dependence | | Lars D. Mosgaard
; Andrew D. Jackson
; Thomas Heimburg
; | | Date: |
17 May 2013 | | Abstract: | Membranes are two-dimensional structures embedded in a three-dimensional heat
reservoir. At constant temperature, the heat capacity is proportional to the
enthalpy fluctuations. However, when the membrane is embedded in a finite
aqueous reservoir, the enthalpy and temperature fluctuations of the reservoir
are intimately coupled to the enthalpy fluctuations of the membrane. Employing
Monte Carlo simulations, we show that membranes embedded in water reservoirs of
various sizes display different enthalpy fluctuations and fluctuation time
scales. In particular, larger water reservoirs result in a larger enthalpy
fluctuations of the membrane and in slower fluctuation time scales (relaxation
times). In periodic processes such as sound propagation in membranes, the
membrane has only a finite time available to exchange heat with the medium. A
larger frequency therefore reduces the accessible volume of the reservoir. We
discuss the relevance of these considerations for the frequency dependence of
the compressibility and the heat capacity, the velocity of sound in membranes,
and the natural timescale of some dynamic processes such as the propagation of
electromechanical pulses during the action potential of nerves. | | Source: | arXiv, 1305.4105 | | Services: | Forum | Review | PDF | Favorites | |
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