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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Biochim Biophys Acta. 2008 May 16;1777(7-8):684–688. doi: 10.1016/j.bbabio.2008.05.005

Fig. 1.

Fig. 1

Absorption spectra (A) and action spectra (B) of xanthorhodopsin. In A: spectrum 1, xanthorhodopsin; spectrum 2, after hydrolysis of the retinal Schiff base with hydroxylamine; spectrum 3, after borohydride reduction of the retinal Schiff base. Hydroxylamine releases the retinal and that decreases the resolution of the vibronic bands of the carotenoid, while borohydride leaves the reduced retinal in its binding site and does not significantly alter the carotenoid spectrum. In B: spectra 1 and 2, action spectra for photoinhibition of respiration by S. ruber and Archaebacterium sp. (Halorubrum sp.) cells, respectively. After [13, 22, 25].