Grinding a vee tool

Munday, S

doi:10.1088/0950-7671/8/9/407

Cited by 1 publication

(2 citation statements)

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“…The effect of the PS 1 acceptor methylviologen (Em, = -440 mV) in algae, reported by Munday and Govindjee (1969), supports the hypothesis of a PS 1 block during the 1$,-4~ rise, and suggests that this block is due to a lack of endogenous acceptor at this stage. As shown in Fig.…”

Section: The 41-4p-4~ Wavesupporting

confidence: 73%

“…One may speculate that the lack of PS 1 acceptor occurs only after a few turnovers of PS 1. This initial exhaustion of a small pool of PS 1 acceptor in the dark-adapted state might explain the 'dip' (transient minimum immediately after +I) observed in conditions where A is likely to be more or less reduced in the dark-adapted state (anaerobiosis: Munday and Govindjee, 1969;Schreiber et al, 1972; or incubation of whole algae with dithionite: Schreiber et al, 1972). Munday and Govindjee provided data supporting an interpretation of the dip as involving oxidation of Q by PS 1".…”

Section: The 41-4p-4~ Wavementioning

confidence: 99%

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Fluorescence Induction in Algae and Chloroplasts

Lavergne

1974

Photochem & Photobiology

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Abstract—The first phases of the fluorescence transient elicited by illumination of dark‐adapted algae or isolated chloroplasts (biphasic rise φ***v ‐ φI ‐ P) have previously been shown to be controlled by two quenchers: Q, the primary acceptor of Photosystem 2 interacting with the secondary acceptor pool A; and R, a non‐photochemical quencher which goes into a non‐quenching state as A is reduced. The dependence of the kinetics of φ decay after illumination upon the redox state of A was studied. It is suggested that some of the centres are in a disconnected state, where electron transfer between Q and A is hindered, the amount of such centres being correlated to the reduction state of A. The implications of this hypothesis on the problem of the variation of the Q‐A‘equilibrium constant’ under different experimental conditions, and on Murata's ‘weak light effect’ are discussed. The effect of 3‐(3,4 dichlorophenyl)‐1,1 dimethylurea (DCMU) on R is shown to depend upon the redox state of A. A DCMU‐induced shift of the midpoint potential of R may account for this dependence. Evidence is given suggesting that the transient reduction of A which occurs in algae during the φI‐φP rise is controlled by an induction process on the acceptor side of Photosystem 1.

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Section: The 41-4p-4~ Wavesupporting

confidence: 73%

Section: The 41-4p-4~ Wavementioning

confidence: 99%