Abstract
The purple membrane of Halobacterium halobium acts as a light-driven proton pump [ 11. It contains a single protein to which a retinal is bound via a protonated Schiff-base [2,3]. This protein-retinal complex, bacteriorhodopsin (BR), undergoes a reaction cycle involving several intermediates after light absorption. The photocycle can be described by the following scheme showing the time sequence of intermediates of BR in the purple membrane as defined in [4], the numbers giving their approximate wavelength maxima [4-61:
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