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• W1978237360 abstract "When dark-adapted spinach chloroplasts are illuminated by an oversaturating laser pulse (total duration less than 150 ns) a double advancement in the S-states (S1 → S3) is observed, as revealed by the relatively high oxygen yield measured after a second flash. The oxygen evolved on the second (Y2) and the third (Y3) flashes of a series has been measured as a function of the energy of a first laser pulse; the half-saturating energy for Y2 is about 7-times higher than that for Y3. This high energy requirement for Y2 shows that double photoreactions occur during the course of the first laser pulse. Experiments with double laser pulses show that for a fraction of the centers, the turnover time is limited by a submicrosecond dark step, which could conceivably be the reduction of photooxidized chlorophyll by a secondary donor. Under the same experimental conditions, Chlorella cells do not undergo double photoreactions upon illumination by a laser pulse. The absence of such efficient double photoreactions has already been reported (Jursinic, P. (1981) Biochim. Biophys. Acta 635, 38–52) using Chlorella or pea chloroplasts. In the presence of a saturating concentration of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (20 μM DCMU), chloroplasts are able to evolve oxygen with a maximum on the second flash. The inhibition is 89% for the second and close to 99% for the third flash. These results indicate that two electron-acceptot sites are accessible during the course of a laser pulse. The probability of charge stabilization for the second photoreaction always remains low in chloroplasts and is close to zero for Chlorella cells." @default.
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• W1978237360 date "1981-11-01" @default.
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• W1978237360 title "Double photoreactions induced by a laser flash as measured by oxygen emission" @default.
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• W1978237360 doi "https://doi.org/10.1016/0005-2728(81)90196-1" @default.
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