Figure 13.

Photographs of 1.5% nondenaturing agarose gels showing photocleavage of 38 μM bp pUC19 plasmid DNA in the presence and absence of 5 μM N¹-(anthracen-9-ylmethyl)ethane-1,2-diaminium dichloride 2 and 50 to 400 mM of: (A) NaCl, (B) KCl, (C) CsCl, and (D) NH₄Cl (10 mM sodium phosphate buffer pH 7.0). The reactions in Lanes 1 to 11 were irradiated for 60 min in a ventilated Rayonet photochemical reactor fitted with 8 RPR-3500 Å, 24 W lamps. (Panels A and B also appear in Figure 2 of this manuscript.) Highlighted in red are the first reactions in each series in which there is a statically significant salt-induced photocleavage enhancement relative to the no-salt control reactions in Lane 2.