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- W2051880610 abstract "A simple and rapid procedure for preparing thylakoid membranes that are active in photosynthetic electron transport from diverse phytoplankton species is described. The method requires disruption of algal cells with glass beads, exposure to mild hypotonic stress, and subsequent enrichment of the thylakoid membranes by differential centrifugation. Isolated thylakoid membranes were assayed for photosynthetic electron transport activity by measuring rates of oxygen consumption and oxygen production, using a variety of electron donors and acceptors. In the dinoflagellate Gonyaulax polyedra Stein, a relatively broad pH optimum between 7.0 and 8.0 was determined for the whole chain electron transport from water to methyl viologen. The preparation maintained maximum activity for 45 min following the preparation. The assay for photosystem I activity in G. polyedra, determined as electron flow from ascorbate/2,6-dichlorophenolindophenol to methyl viologen, had a somewhat narrower pH optimum around 8.0. Rates of whole chain photosynthetic electron transport on a per cell and on a per chlorophyll a basis were shown to decrease dramatically with cell age in batch cultures of G. polyedra. Using the procedures optimized for G. polyedra, reproducible rates of electron transport on a per cell chlorophyll a basis were also measured in cultures of the dinoflagellate Glenodinium sp., the diatom Nitzschia closterium (Ehrenberg 1839) Wm. Smith 1853 and the chrysophyte Monochrysis lutheri Droop {= Pavlova lutheri (Droop) Green}. Other electron transport assays applied to G. polyedra, and that resulted in comparable rates to those found in other algal groups, include the photosystem II assay from water to diaminodurene/ferricyanide and the photosystem I assay from durohydroquinone to methyl viologen." @default.
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- W2051880610 date "2004-10-29" @default.
- W2051880610 modified "2023-09-24" @default.
- W2051880610 title "PHOTOSYNTHETIC ELECTRON TRANSPORT IN CELL-FREE EXTRACTS OF DIVERSE PHYTOPLANKTON1,2" @default.
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- W2051880610 doi "https://doi.org/10.1111/j.0022-3646.1985.00453.x" @default.
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