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An energy‐dependent, transient peak in the minute range decay of luminescence, present in CO 2 ‐accumulating cells of Scenedesmus obliquus
Author(s) -
Sundblad L.-G.,
Palmqvist K.,
Samuelsson G.
Publication year - 1986
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(86)81226-1
Subject(s) - scenedesmus obliquus , luminescence , scenedesmus , kinetics , chemistry , biophysics , excitation , transient (computer programming) , photosynthesis , algae , botany , biochemistry , physics , biology , optoelectronics , quantum mechanics , computer science , operating system
Photosynthetic O 2 evolution in the green alga, Scenedesmus obliquus , was shown to be more sensitive to the uncoupler FCCP when assayed in a low C i medium than in a high C i medium, indicating the action of an energy‐dependent mechanism for C i uptake. Low C i adapted algae exhibited characteristic luminescence decay kinetics with a transient peak 20–60 s after excitation. This peak was abolished by addition of FCCP and HCO − 3 . The effect caused by HCO − 3 was partially reversed by methyl viologen. In view of the results obtained, a model is presented in order to discuss the origin of the transient luminescence peak.