the kinetics of the hydrogen-deuterium exchange reactions of double-helical poly [ d ( a-t ) ] x poly [ d ( a-t ) ] , poly ( da ) x poly ( dt ) , and constituent nucleosides ( deoxyadenosine and thymidine ) have been examined at various temperatures by stopped-flow ultraviolet spectrophotometry , in the spectral region 240-300 nm .
C0020275
hydrogen
C0011744
deuterium