minnale wrote:
Hi all, this may be trivial question to you. I am unfamiliar with gromacs. My doubt is that in POPC analysis most of the cases concerning about Z-axis why not X and Y. Can you please clear me this doubt.
Thanks in advance for your suggestion.


By convention, we think of bilayers in the x-y plane, with the normal to the bilayer lying along the z-axis. In a practical sense, it is also very convenient to use semiisotropic pressure coupling (applied in the x/y and z dimensions) for membranes.

-Justin



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Justin A. Lemkul
Graduate Research Assistant
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin

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