Figure 6.

EPR spectra of ^•NO addition to ADO in the absence (A) and presence (B and C) of cysteamine. ^•NO was released by 0 (black), 0.1 (gray), 0.5 (light gray), and 2.5 (red) equiv of ^•NO releasing agent (1 equiv of agent produces approximately 1.5 equiv of ^•NO). A, in the absence of substrate, changes occur in the low-field (high-spin) region with increasing ^•NO. Spectra were taken at 10 K with 50 mW microwave power. B, in the presence of substrate, changes occur in both high- and low-spin regions with increasing ^•NO. Spectra were taken at 10 K, 1 mW. C, in the presence of substrate, changes occur in the g = 2 region with increasing ^•NO. Spectra were taken at 50 K with 0.05 mW microwave power.