denaturation of the complexes followed at both polynucleotide and drug levels leads to a biphasic melting process for poly ( da-dt ) complexed with ethidium dimer ( t1/2 = 75 degrees c ; 93 degrees c ) but a monophasic one in poly ( da-dt ) : ethidium bromide complex ( t1/2 = 74 degrees c ) .
C0015008
ethidium
C0019873
ethidium bromide