the kinetics of the hydrogen-deuterium exchange reactions of deoxyguanosine ( dg ) , deoxycytidine ( dc ) , double-helical poly [ d ( g-c ) ] x poly [ d ( g-c ] , and double-helical poly ( dg ) x poly ( dc ) have been examined at 20 degrees c , ph 7.0 , and in low-salt ( 0.15 m nacl ) medium by stopped-flow ultraviolet spectrophotometry , in the spectral region of 260 to 320 nm .
C0020275
hydrogen
C0011744
deuterium