pH-dependence of bacteriochlorophyll fluorescence in aqueous extracts of purple bacteria

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 are discussed in connection with those from an earlier study1.