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Fig. 3.28 Structure and photocycle of the bacteriorhodopsin molecule
Fig. 3.29 Spectra of bacteriorhodopsin conformers
opportunity arises to convert the molecule from the state O(640) to another long-
lived state, Q(380), by selective radiation. Mechanisms of transition between
excited states of the molecule may vary and have different temperature dependen-
cies. At 77 K the photocycle of the natural bacteriorhodopsin gets disrupted, and the
