Abstract
• The pH-dependence of the bacteriochlorophyll fluorescence in acqueous extracts from Chromatium strain D, Rhodopseudomonas spheroides, and Rhodospirillum rubrum stain 4 was studied.
• This dependence varied for the various species.
• Within the same species no different fluorescence responses to pH changes were observed for the various bacteriochlorophyll types.
• The results
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