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- W1985351736 abstract "Abstract— Chlorella samples, incubated for varying periods in darkness, were exposed to a series of 20–40 nsec flashes, spaced 15 sec apart, from a Q-switched ruby laser. A stationary Teflon-covered platinum electrode measured the microjet of oxygen produced by each flash. After a dark preincubation exceeding 3 min, at 23°C, little or no oxygen is evolved until the third flash in a sequence. The yields from subsequent flashes increase monotonically until a constant value is reached. If low levels of background light are supplied, or if the interval between series of flashes is decreased, oxygen is evolved on the second or even the first flash. Very similar results were obtained from analogous experiments with tailless 28 μsec flashes from a xenon flashtube. In particular, very little oxygen was evolved from the second flash following a long dark period whatever the spacing between flashes. This means that there are no systematic differences between the effects of saturating 20 nsec and 28 μsec light flashes on the activation processes during the first few flashes following a long dark period. No oscillations of flash yield with successive flashes were observed because of the long interval between flashes. These results are consistent with the idea that the reaction center of Photosystem II must undergo a dark process lasting considerably longer than 28 μsec before it can absorb a second photon." @default.
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- W1985351736 date "1970-06-01" @default.
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- W1985351736 title "ACTIVATION KINETICS OF PHOTOSYNTHETIC OXYGEN EVOLUTION UNDER 20–40 NANOSECOND LASER FLASHES" @default.
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- W1985351736 doi "https://doi.org/10.1111/j.1751-1097.1970.tb06020.x" @default.
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