Results 261 to 270 of about 47,143 (306)
The Evolution and Evolvability of Photosystem II [PDF]
Annual Review of Plant Biology, 2023 Photosystem II is the water-oxidizing and O2-evolving enzyme of photosynthesis. How and when this remarkable enzyme arose are fundamental questions in the history of life that have remained difficult to answer. Here, recent advances in our understanding of the origin and evolution of photosystem II are reviewed and discussed in detail.
Joko P Trinugroho +2 more
exaly +5 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
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
openaire +4 more sources
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
openaire +2 more sources
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