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From reaction centres (RC) of Rhodobacter sphaeroides R-26 two LM preparations with 0.90 Fe 2+ /RC (LM) and 0.10 Fe 2+ /RC (LM/dFe) were prepared. Reconstitution of LM/dFe with the H-subunit and subsequently with Zn 2+ yielded LMH/dFe and LMH/dFe+Zn preparations, respectively. In these four samples the decay of the primary radical pair P + I - ...
Isolated RC's from Rps. viridis were reversibly depleted of both UQ (Q B ) and MK (Q A ). The photochemical activity was eliminated and restored upon the depletion and reconstitution of the Q A . Four methods for depleting Q A from the RC's were studied and their results were compared. The best way allowed us for the first time to prepare Q A -depleted RC's...
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