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 Post subject: The oxidative stress imposed by the increased flow of electr
PostPosted: Tue Jan 30, 2018 12:27 am 
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Joined: Wed Jul 31, 2013 1:53 am
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The oxidative stress imposed by the increased flow of electrons to fixation
Further enhanced by the impairment and reduced activity of Rubisco at elevated temperatures. Furthermore, at elevated temperatures the affinity of Rubisco for oxygen is increased relative to its affinity for CO2 resulting increased photorespiration and overwhelming production of deleterious Adriamycin Topoisomerase inhibitor ROS that impair the D1 repair activity. Short-term exposure to elevated temperatures results in reversible effects on the photosynthetic activity. However, prolonged exposure to temperatures above the physiological range causes a strong imbalance in the rates of PSIIRC impairment and repair, resulting in the collapse of the photosynthetic machinery and death of the photoautotrophic organism. Therefore, photosynthetic organisms have had BU 4061T Proteasome inhibitor to develop strategies to sustain their growth in extremely hot, intermediate, and extremely cold habitats. Despite this overall plasticity, the individual strains maintain activity over a narrow range of temperatures, typically 65–10uC around their physiological optimum. Hence, prolonged global warming is expected to strongly diminish the PSII activity in mesophilic organisms, resulting in reduced biomass production, unstable ecosystems worldwide, as was already observed in oceanic coral populations, and in disruption of renewable energy and food resources.


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