Results 311 to 320 of about 90,453 (337)
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Carotenoid Oxidation in Photosystem II
Biochemistry, 1999The oxidation of carotenoid upon illumination at low temperature has been studied in Mn-depleted photosystem II (PSII) using EPR and electronic absorption spectroscopy. Illumination of PSII at 20 K results in carotenoid cation radical (Car+*) formation in essentially all of the centers.
J, Hanley +4 more
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Photoinhibition of Photosystem II
International Review of Cell and Molecular Biology, 2013Photoinhibition of Photosystem II (PSII) is the light-induced loss of PSII electron-transfer activity. Although photoinhibition has been studied for a long time, there is no consensus about its mechanism. On one hand, production of singlet oxygen ((1)O(2)) by PSII has promoted models in which this reactive oxygen species (ROS) is considered to act as ...
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Trypsin inhibition of Photosystem II
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1971Abstract 1. Brief incubation of chloroplasts with trypsin accelerated (by uncoupling) while longer incubation inhibited the Hill reaction with 2,6-dichlorophenolindophenol (DCIP). When an uncoupler (NH 4 Cl or methylamine · HCl) was present, or when the reaction was light-limited, even brief incubation with trypsin inhibited the reaction.
B R, Selman, T T, Bannister
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Current perceptions of Photosystem II
Photosynthesis Research, 1990In the last few years our knowledge of the structure and function of Photosystem II in oxygen-evolving organisms has increased significantly. The biochemical isolation and characterization of essential protein components and the comparative analysis from purple photosynthetic bacteria (Deisenhofer, Epp, Miki, Huber and Michel (1984) J Mol Biol 180: 385-
O, Hansson, T, Wydrzynski
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Heterogeneity in chloroplast photosystem II
Photosynthesis Research, 1986Photosystem-two (PSII) in the chloroplasts of higher plants and green algae is not homogeneous. A review of PSII heterogeneity is presented and a model is proposed which is consistent with much of the data presented in the literature. It is proposed that the non-quinone electron acceptor of PSII is preferentially associated with the sub-population of ...
M T, Black, T H, Brearley, P, Horton
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Carotenoid Photooxidation in Photosystem II
Archives of Biochemistry and Biophysics, 2001Carotenoids are known to function as light-harvesting pigments and they play important roles in photoprotection in both plant and bacterial photosynthesis. These functions are also important for carotenoids in photosystem II. In addition, beta-carotene recently has been found to function as a redox intermediate in an alternate pathway of electron ...
C A, Tracewell +4 more
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1996
Two main topics are addressed in this chapter:’ static heterogeneities’ of PS II, as they appear in standard dark-adapted material, and ‘dynamic heterogeneities’ possibly involved in the non-photochemical quenching processes that modulate the steady-state yield of PS II.
Jérôme Lavergne, Jean-Marie Briantais
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Two main topics are addressed in this chapter:’ static heterogeneities’ of PS II, as they appear in standard dark-adapted material, and ‘dynamic heterogeneities’ possibly involved in the non-photochemical quenching processes that modulate the steady-state yield of PS II.
Jérôme Lavergne, Jean-Marie Briantais
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Inactive photosystem II centers: A resolution of discrepencies in photosystem II quantitation
Photosynthesis Research, 1990The abundance of photosystem II in chloroplast thylakoid membranes has been a contentious issue because different techniques give quite different estimates of photosystem II titer. This discrepancy led in turn to disagreements regarding the stoichiometry of photosystem II to photosystem I in these membranes.
D R, Ort, J, Whitmarsh
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Copper in photosystem II: association with LHC II
Photosynthesis Research, 1987Photosystem II particles from spinach and barley contained 2.5 and 4.2 Cu per 300 chlorophylls respectively. This Cu was resistant to removal by EDTA. A large percentage of the PSII Cu in both plants is associated with the light-harvesting chlorophyll a/b protein, LHCII; 46% in barley and 76% in spinach.
P R, Sibbald, B R, Green
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Organization of Plant Photosystem II and Photosystem I Supercomplexes
2018In nature, plants are continuously exposed to varying environmental conditions. They have developed a wide range of adaptive mechanisms, which ensure their survival and maintenance of stable photosynthetic performance. Photosynthesis is delicately regulated at the level of the thylakoid membrane of chloroplasts and the regulatory mechanisms include a ...
Kouril, Roman +4 more
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