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- W2058552664 abstract "Acidification of chloroplasts in the dark causes a decrease in the ability of ferrocyanide to reduce the oxidized cytochrome, which is reversible upon raising the pH. This effect is inhibited if 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) is added to the medium before acidification. DCMU inhibition of the loss of ferrocyanide reduction at pH 5.0 occurs at low DCMU concentrations, half-inhibition requiring 1 DCMU:400 chlorophyll molecules under conditions where half-inhibition of oxygen evolution requires the addition of 1 DCMU: 100 chlorophylls. Potentiometric titration shows that the midpoint potential of “high potential” cytochrome b-559 is +395 mV at pH 7.8, +335 mV at pH 5.0, and in the presence of DCMU +380 mV at pH 5.O. The ability of low concentrations of DCMU to exert a specific effect on a property associated with “high potential” cytochrome b-559 implies that this cytochrome, which is known to be in close structural proximity to the reduction center of photosystem II, is a principle site of action of DCMU." @default.
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- W2058552664 title "On the specific site of action of 3-(3,4-dichlorophenyl)-1,1-dimethylurea in chloroplasts: Inhibition of a dark acid-induced decrease in midpoint potential of cytochrome b-559" @default.
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- W2058552664 doi "https://doi.org/10.1016/0003-9861(76)90195-8" @default.
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