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Luminescence decay kinetics in relation to the relaxation of the transthylakoid ΔpH from high and low CO 2 adapted cells of Scenedesmus obliquus
Author(s) -
Sundblad Lars-Göran,
Palmqvist Kristin,
Samuelsson Göran
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)81078-x
Subject(s) - luminescence , kinetics , scenedesmus obliquus , quenching (fluorescence) , chemistry , relaxation (psychology) , analytical chemistry (journal) , photochemistry , materials science , biology , optics , algae , physics , fluorescence , botany , chromatography , optoelectronics , quantum mechanics , neuroscience
Luminescence decay kinetics was shown to be polyphasic with two relative maxima observed, when high CO 2 adapted cells of Scenedesmus obliquus were stressed by CO 2 deficiency. Low CO 2 adapted cells exhibited a single maximum. Luminescence from high CO 2 adapted cells under high CO 2 conditions decayed asymptotically without maxima. The magnitude of the transthylakoid ΔpH was shown to be related to the intensity of luminescence in an antiparallel way. The relaxation kinetics of the ‐ΔpH was shown to be complex, with an interval of increasing or maintained ΔpH. A working hypothesis is presented in order to explain polyphasic luminescence decay kinetics in terms of luminescence quenching by the transthylakoid ΔpH.