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Constant-pressure molecular-dynamics simulations of phospholipid membranes inthe fluid phase reveal strong correlations between equilibrium fluctuations ofvolume and energy on the nanosecond time-scale. The existence of strongvolume-energy correlations was previously deduced indirectly by Heimburg fromexperiments focusing on the phase transition between the fluid and the orderedgel phases. The correlations, which are reported here for three differentmembranes (DMPC, DMPS-Na, and DMPSH), have volume-energy correlationcoefficients ranging from 0.81 to 0.89. The DMPC membrane was studied at twotemperatures showing that the correlation coefficient increases as the phasetransition is approached.

Volume-energy correlations in the slow degrees of freedom of computer-simulated phospholipid membranes