Hi Tsjerk,<br><br>Thanks a lot. <br>Surely I can't modify the force field by my self. It's impossible to me to understand all of things you mentioned. So is it the only way to achieve my purpose? If so, it's so frustrating. I've been trying my best to contact with the author of one of my references. He applied several of Gromos 96 force field (may be he modified these force field too) to a similar enzyme/substrate system, and hope i can get some information from him. Even though, i really eager to get some knowledge from all of gmx-users. Anyway, I'm always grateful for your comment.<br>
<br>Ji<br><div class="gmail_quote">On Thu, Feb 19, 2009 at 5:09 PM, Tsjerk Wassenaar <span dir="ltr"><<a href="mailto:tsjerkw@gmail.com">tsjerkw@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br>
<div class="Ih2E3d"><br>
> I'm not familiar with<br>
</div><div class="Ih2E3d">> i can't tell myself which<br>
</div>> guess i can<br>
<div class="Ih2E3d">> I have no idea whether<br>
<br>
</div>This is the worst possible basis for trying to modify a force field.<br>
First get well acquainted with molecular dynamics and the role and<br>
whereabouts of force fields. Then you can start thinking of using such<br>
knowledge to modify the force field. You will possibly be able to<br>
change a force field, but making it produce sensible results is a<br>
different thing.<br>
<br>
Sorry for not telling you what you want to hear.<br>
<br>
Tsjerk<br>
<br>
--<br>
Tsjerk A. Wassenaar, Ph.D.<br>
Junior UD (post-doc)<br>
Biomolecular NMR, Bijvoet Center<br>
Utrecht University<br>
Padualaan 8<br>
3584 CH Utrecht<br>
The Netherlands<br>
P: +31-30-2539931<br>
F: +31-30-2537623<br>
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