“…21 This role is worth of consideration, as it has recently been shown that light enhances the biosynthesis of bacterioruberin in halobacteria. 48 In this context we observed that a prolonged incubation of claret membrane at 277 K resulted in specific oxidization of bacterioruberin, which was accompanied by a significant morphological change of claret membrane; i.e., a tubular membrane formed (unpublished data). (It was previously observed by Okumura et al that oxidation of bacterioruberin in the claret membrane of Halorubrum sp.…”