title: Direct 23Na NMR observation of mixed cations residing inside a G-quadruplex channel.
abstract: We report direct (23)Na NMR observation for the presence of mixed cations (Na(+)/K(+), Na(+)/Rb(+), Na(+)/Sr(2+)) inside the G-quadruplex channel formed by the self-association of guanosine 5'-monophosphate at pH 8.
authors.affiliation: Department of Chemistry, Queen's University, 90 Bader Lane, Kingston, Ontario, Canada.
authors.forename: Ramsey
authors.initials: R
authors.lastname: Ida
authors.forename: Irene C M
authors.initials: IC
authors.lastname: Kwan
authors.forename: Gang
authors.initials: G
authors.lastname: Wu