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In vivo electron flow in the unicellular cyanobacterium Synechococcus sp. PCC 7002 was studied by pulsed, time- resolved photoacoustics (PTRPA). Using 1-μs, 2 μJ or 1013 hνcm-2 pulses at 695 nm, we observed large (42 ± 2%) Photosystem I (PS I) cyclic energy storage (ES) in the period of 2 to 12 ms after excitation with wild type (WT) intact cells. This cyclic ES was insensitive to flash interval from...
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