RE: [gmx-users] charge density of lipid

2007-09-01 Thread Mu Yuguang \(Dr\)
No, net charge density estimated from experimental data.

Best regards
Yuguang
 
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David van der Spoel
Sent: Saturday, September 01, 2007 4:49 PM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] charge density of lipid

Mu Yuguang (Dr) wrote:
 Dear all,
 
 How to estimate the charge density of a lipid , the reason we want to
do 
 is that we try a model system to mimic the lipid environment.
 
 It seems out of GROMACS discussion range, but I believe many Gromacs 
 users do lipid simulations.
 
do you mean electron density? In that case there are plenty of tools in 
the CCP4 suite of programs.


 Best regards
 
 Yuguang
 
  
 
 


 
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RE: [gmx-users] charge density of lipid

2007-09-01 Thread Mu Yuguang \(Dr\)
I found one see this paper
http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1302891blobtype=p
df
it is defined by sigma_M

Best regards
Yuguang
 
Dr. Yuguang Mu
Assistant Professor
School of Biological Sciences
Nanyang Technological University
60 Nanyang Drive  Singapore 637551 Tel: +65-63162885 Fax: +65-67913856
http://genome.sbs.ntu.edu.sg/Staff/YGMu/index.php
 

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of David van der Spoel
Sent: Saturday, September 01, 2007 4:54 PM
To: Discussion list for GROMACS users
Subject: Re: [gmx-users] charge density of lipid

Mu Yuguang (Dr) wrote:
 No, net charge density estimated from experimental data.
what does it mean, how is it measured?
you can have nuclear charge minus electron density, but this is not very

accurate.



-- 
David van der Spoel, Ph.D.
Molec. Biophys. group, Dept. of Cell  Molec. Biol., Uppsala University.
Box 596, 75124 Uppsala, Sweden. Phone:  +46184714205. Fax: +4618511755.
[EMAIL PROTECTED]   [EMAIL PROTECTED]   http://folding.bmc.uu.se
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