oxygen positions around a DNA

From: Ioana Cozmuta <ioana/at/nas.nasa.gov>
Subject: oxygen positions around a DNA
Date: Fri, 23 Jan 2004 13:44:33 -0800 (PST)

 Hi ccl users,
 Could anyone point me to some references that discuss what are the
 optimal position of oxygen molecules around a DNA strand?
 Thank you,
 Ioana