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- W2063166564 abstract "1.|The effect of temperature on CO2 assimilation and on fluorescence emission at 55–73°C, was investigated to determine thermostability of energy transfer from phycocyanin to chlorophyll in the extreme thermophile Synechococcus lividus (culture OH-68-s, clone H-Xf). 2.|Slopes of the curves of CO2 assimilation with increasing 620 or 690 nm light intensities decline at higher incubation temperatures (70–73°C) but the decline with 620 nm light was greater. The depressed light-dependent slopes and a non-linear rise in CO2 assimilation with 620 nm light imply a degree of thermolability in energy transfer from phycocyanin to chlorophyll. 3.|Phycocyanin fluorescence and phycocyanin-excited chlorophyll fluorescence increased equally with increasing incubation temperatures up to 73°C, indicating that energy flow from phycocyanin to short wave (686 nm) fluorescent chlorophyll of photosystem 2 is not greatly disrupted. 4.|Enchancement expressed as E1 was maximal at 55°C, indicating that electon flow from photosystem 2 was limiting at this suboptimal growth temperature. Enhancement expressed as E2 was maximal at 73°C, indicating that oxidation of the electron transport chain by photosystem 1 was limiting. Analysis of the enhancement data imply that spillover from photosystem 2 to photosystem 1 could occur at 55°C and that either energy flow from phycocyanin to photosystem 1 chlorophyll or photoreaction 1 directly was impaired at 73°C." @default.
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- W2063166564 date "1978-03-01" @default.
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- W2063166564 title "Photosynthetic properties of the extreme thermophile Synechococcus lividus—I. Effect of temperature on fluorescence and enhancement of CO2 assimilation" @default.
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