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. Author manuscript; available in PMC: 2010 Oct 27.

Published in final edited form as: J Inorg Biochem. 2007 Jun 12;101(10):1394–1399. doi: 10.1016/j.jinorgbio.2007.05.016

Fig. 4 — Electrochemical reduction of ferrous verdoheme-rHO-1 complex under anaerobic conditions. (A) Absorption spectra of the verdoheme-rHO-1 complex (0.1 mM) during the electrochemical-optical titration at 25 °C were recorded. The experimental conditions and procedures are described in the EXPERIMENTAL section. Applied potentials were: +0.22 (rest potential,), −0.40 ( -.-.-.- ), −0.45 ( …….. ), −0.50 (- - - -), -0.55 ( -…-…- ), and -0.60 V () vs NHE. (B) The Nernst plot obtained from the absorbance change at 688 nm of the ferrous verdoheme-rHO-1 complex.

Inline graphic — Electrochemical reduction of ferrous verdoheme-rHO-1 complex under anaerobic conditions. (A) Absorption spectra of the verdoheme-rHO-1 complex (0.1 mM) during the electrochemical-optical titration at 25 °C were recorded. The experimental conditions and procedures are described in the EXPERIMENTAL section. Applied potentials were: +0.22 (rest potential,), −0.40 ( -.-.-.- ), −0.45 ( …….. ), −0.50 (- - - -), -0.55 ( -…-…- ), and -0.60 V () vs NHE. (B) The Nernst plot obtained from the absorbance change at 688 nm of the ferrous verdoheme-rHO-1 complex.