the fluorescence excitation spectrum of complexes formed from the reversible binding of the proximate carcinogen , trans-7,8-dihydroxy-7,8-dihydro-benzo [ a ] pyrene ( bp78d ) to closed-circular , single-stranded , viral m13mp19 dna ( ss m13 dna ) exhibits a red-shift of 5 nm compared to the spectrum of bp78d measured without dna or with native , calf thymus dna .
C0012935
single-stranded
C0012854
dna