How to make a negatively charged surface

From: Shahid Qamar (qamar13_at_hotmail.com)
Date: Mon Nov 08 2004 - 14:25:30 CST

Hi,
I want to creat a surface covered with negatively charged molecules like
COO- . then I want to have single stranded DNA immobalized on this surface.
Any one knows any script or any idea how I can make it .
Thanks for your help.

Shahid

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