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Photosynthesis Research, 2000
Inhibition of Photosystem II (PS II) activity induced by continuous light or by saturating single turnover flashes was investigated in Ca(2+)-depleted, Mn-depleted and active PS II enriched membrane fragments. While Ca(2+)- and Mn-depleted PS II were more damaged under continuous illumination, active PS II was more susceptible to flash-induced ...
Keren, N. +4 more
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Inhibition of Photosystem II (PS II) activity induced by continuous light or by saturating single turnover flashes was investigated in Ca(2+)-depleted, Mn-depleted and active PS II enriched membrane fragments. While Ca(2+)- and Mn-depleted PS II were more damaged under continuous illumination, active PS II was more susceptible to flash-induced ...
Keren, N. +4 more
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Manganese-dependent carboanhydrase activity of photosystem II proteins
Biochemistry (Moscow), 2009Four sources of carbonic anhydrase (CA) activity in submembrane preparations of photosystem II (PS II) isolated from pea leaves were examined. Three of them belong to the hydrophilic proteins of the oxygen-evolving complex of PS II with molecular mass 33 kDa (protein PsbO), 24 kDa (protein PsbP), and 18 kDa (protein PsbQ).
A V, Shitov +4 more
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Photobiont-dependent humidity threshold for chlorolichen photosystem II activation
Planta, 2019Photobiont type influences the relative humidity threshold at which photosystem II activates in green algal lichens. Water vapor uptake alone can activate photosynthesis in lichens with green algal photobionts. However, the minimum relative humidity needed for activation is insufficiently known.
Nathan H. Phinney +2 more
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Two Redox-Active β-Carotene Molecules in Photosystem II
Biochemistry, 2003Photosystem II (PS II) contains secondary electron-transfer paths involving cytochrome b(559) (Cyt b(559)), chlorophyll (Chl), and beta-carotene (Car) that are active under conditions when oxygen evolution is blocked such as in inhibited samples or at low temperature.
Cara A, Tracewell, Gary W, Brudvig
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Inhibitions of photosystem II activity by proton gradient
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1994Abstract Nigericin stimulates PS II turnover in thylakoids at low but not at high light intensity in a low-frequency regime (6 Hz) at pH 8. When the external pH is decreased, stimulation by the uncoupler is also observed at high light intensity. Neither phosphorylation of LHCII nor unstacking of the thylakoids changes the effect of nigericin at pH 8.
Alexander M. Ehrenheim +2 more
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Structure–activity studies on amides inhibiting photosystem II
J. Chem. Soc., Perkin Trans. 2, 1991A series of N-phenylanilides and N-phenylureas have been synthesised and their ‘in vitro’ photosystem II activity measured in a cell-free system. An attempt was made to correlate ‘in vitro’ data with a novel hydrophobicity parameter πamide(related to the substituent on the phenyl ring) and with the torsion angle θ between the planes of the phenyl and ...
Richard J. Lewis +5 more
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Active Oxygen and Photoinhibition of Photosystem II
1998Plants have machinery that efficiently converts light energy to chemical energy to perform photosynthesis even under illumination with weak light. However, when supply of light energy exceeds consumption of energy by carbon assimilation and subsequent reactions, the efficiency of photosynthesis is reduced (photoinhibition of photosynthesis). Under such
Mitsue Miyao-Tokutomi +3 more
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Photosystem II activity of chloroplast fragments lacking P700
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1971Abstract Chloroplast fragments, prepared with the detergent Triton X-100, had a pigment composition characteristic of Photosystem II. The fragments had chlorophyll a/chlorophyll b ratios of 1.7–1.9 and had no detectable P700, either by photochemical or chemical assay.
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Assay of Photoinhibition of Photosystem II and Protease Activity
2004Under light-stress conditions, the photosystem (PS)II reaction center D1 protein is photo-damaged. The damage to the D1 protein is induced by singlet oxygen molecules and endogenous free radicals generated by the photochemical reactions of PSII. To maintain PSII activity, the oxidatively damaged D1 protein is replaced by a newly synthesized protein ...
Yasusi, Yamamoto +4 more
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