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Changes in absorbance and fluorescence excitation and emission spectra in the ultraviolet and visible regions of the system containing ethidium bromide (EtBr) and Hoechst-33258 (Ht) were investigated depending on various DNA quantities and the composition of the medium. It is noted that spectral properties of this system are determined by interactions of EtBr and Ht both with nucleic acid and with...
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