charge neutralization in DNA

From: Mahadevan Seetharaman <>
Date: Tue 18 Feb 2003 13:08:55 -0600 (CST)


I have two positively charged N-groups in my DNA 10-mer (duplex). When I
do "addions unit Na+ 0", only 16 sodium ions are added (understandable,
since the net charge is -16, 18 phosphates and two N+). I think the system
should have 18 Na+ ions and 2 Cl- ions instead of 16 Na+ ions. If I want
to add 18 Na+ ions and 2 Cl- ions to this system, how would I do it, apart
from doing it manually.

Thanx in advance for your responses,
Received on Tue Feb 18 2003 - 11:08:55 PST
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