Hi

I have some questions about the surface tension calculations:

        1. For the formula, \gamma_m=(P_N - P_L) * L_z / 2, is it only 
available for a flat surface, like a lipid bilayer in water ?  For example, the 
surface fluctuation of lipid bilayer often occur in the simulation, sometimes, 
the surface is not flat but bending, in such a case, is the formula still 
available?     What about the vesicle?

        2. In my system, there are a bilayer patch and a NP of ~10nm, they are 
all in water. At the beginning (state 1), NP and the bilayer don't contact each 
other. After some nanoseconds runtime, NP adsorbs on the surface of the bilayer 
(state 2). Finally(state 3), the NP embeds into the inner of the lipid bilayer. 

In this case, how can I measure the changing surface tension during the 
simulation?  Is the formula above available for my system?
In state 1, is that meaning there are four interface in the system? What about 
the case (state 2,3) that the NP contacting the bilayer ?        

I hope I've describe my questions clearly. Any suggestion or recommended 
reference will be appreciated.

Thank you very much.

Sincerely
                                

        Li Yang
[EMAIL PROTECTED]
          2008-07-17
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