Results 221 to 230 of about 31,838 (263)
Some of the next articles are maybe not open access.
The nonheme iron in photosystem II
Photosynthesis Research, 2013Photosystem II (PSII), the light-driven water:plastoquinone (PQ) oxidoreductase of oxygenic photosynthesis, contains a nonheme iron (NHI) at its electron acceptor side. The NHI is situated between the two PQs QA and QB that serve as one-electron transmitter and substrate of the reductase part of PSII, respectively. Among the ligands of the NHI is a (bi)
Frank, Müh, Athina, Zouni
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
Photoinhibition of Photosystem II
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 ...
openaire +2 more sources
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
openaire +2 more sources
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
openaire +2 more sources
Mechanisms for photosystems I and II
Current Opinion in Chemical Biology, 2003Using structural information from recently published crystal structures of photosystems I and II, the processes of excitation energy transfer and electron transfer in oxygenic photosynthesis have been studied in great detail by experimental and theoretical methods.
openaire +3 more sources
The lipoproteins of cyanobacterial photosystem II
Journal of Photochemistry and Photobiology B: Biology, 2011Photosystem II (PSII) complexes from cyanobacteria and plants perform water splitting and plastoquinone reduction and yet have a different complement of lumenal extrinsic proteins. Whereas PSII from all organisms has the PsbO extrinsic protein, crystal structures of PSII from cyanobacteria have PsbV and PsbU while green algae and higher plants instead ...
Robert D, Fagerlund, Julian J, Eaton-Rye
openaire +2 more sources
On the dimerization of chlorophyll in photosystem II
Physical Chemistry Chemical Physics, 2011In photosystem II, absorbed light energy is transferred to a reaction centre consisting of chlorophyll units. Release of an electron from the reaction centre is the starting point for the charge separation and electron transport chain in PSII. Crystal structures of the reaction centre have identified two chlorophyll monomers forming a dimer with a ...
openaire +2 more sources
Electron transfer in photosystem II
Photosynthesis Research, 1985The picture presently emerging from studies on the mechanism of photosystem II electron transport is discussed. The reactions involved in excitation trapping, charge separation and stabilization of the charge pair in the reaction center, followed by the reactions with the substrates, plastoquinone reduction and water oxidation, are described ...
openaire +2 more sources