[gmx-users] area by lipid

Mark Abraham mark.abraham at anu.edu.au
Sun Nov 25 04:27:32 CET 2007

> Hi:
> I am working on membrane simulation under lipid (DPPC, from Peter
> Tieleman group site). I equilibrated dppc membrane for 10 ns and when
> i got the area by lipid (x*y/ # lipids) using g_energy, i obtained
> that the area is constant (0.64), there isn't any fluctuaction during
> 10 ns..althougth the volumen isn't constant.
> What's wrong in this simulation?

Did you notice that your box dimensions are not changing in X and Y
directions? Do you understand what semiisotropic pressure coupling does?


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