Results 271 to 280 of about 51,482 (311)

Photosystem II activity and triazine resistance in weeds

Canadian Journal of Botany, 1987
The oxygen-evolving properties of broken chloroplasts isolated from biotypes of Chemopodium album and Amaranthus retroflexus that were either sensitive or resistant to s-triazine herbicides were compared. The pattern of oxygen flash yields produced by herbicide-sensitive, dark-adapted chloroplasts of either species was reminiscent of that found with ...
John Sinclair, Philip Macdonald
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Alteration of QB Activity in Photosystem II

1990
The PSII RC complex preparation developed by Ghanotakis and Yocum (1) has 9 subunits and retains native QB activity. The 6 subunit “core” preparations described by Ikeuchi et al. (2) and Ghanotakis et al. (3) have impaired QB activity; highest rates of O2 evolution are seen with Fe(CN)6 3− as a DCMU insensitive electron acceptor. Removal of the 28, 22,
N. Bowlby, J. Petersen, G. T. Babcock, C. F. Yocum   +3 more
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Cu2+ Inhibits Photosystem II Activities but Enhances Photosystem I Quantum Yield of Microcystis aeruginosa

Biological Trace Element Research, 2014
Responses of photosystem I and II activities of Microcystis aeruginosa to various concentrations of Cu(2+) were simultaneously examined using a Dual-PAM-100 fluorometer. Cell growth and contents of chlorophyll a were significantly inhibited by Cu(2+). Photosystem II activity [Y(II)] and electron transport [rETRmax(II)] were significantly altered by Cu ...
Chunnuan, Deng, Xiangliang, Pan, Shuzhi, Wang, Daoyong, Zhang   +3 more
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Cobalt ions inhibit electron-transport activity of Photosystem II without affecting Photosystem I

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1983
Abstract Investigations on photosynthesis have greatly benefited by the use of specific inhibitors that affect a specific site of inhibition on the electron-transport chain. We show here for the first time that cobalt (Co 2+ ) ions can be used specifically to inactivate electron donation to the reaction centre of Photosystem (PS) II without affecting
B.C. Tripathy, B. Bhatia, Prasanna Mohanty   +2 more
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High correlation between thermotolerance and photosystem II activity in tall fescue

Photosynthesis Research, 2014
Heat stress affects a broad spectrum of cellular components and metabolism. The objectives of this study were to investigate the behavior of Photosystem II (PSII) in tall fescue (Festuca arundinacea Schreb) with various thermotolerance capacities and to broaden our comprehension about the relationship between thermotolerance and PSII function.
Ke, Chen, Xiaoyan, Sun, Erick, Amombo, Qing, Zhu, Zhuangjun, Zhao, Liang, Chen, Qingguo, Xu, Jinmin, Fu   +7 more
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Fast Isolation of Highly Active Photosystem II Core Complexes from Spinach

Journal of Integrative Plant Biology, 2010
Abstract Purification of photosystem II (PSII) core complexes is a time‐consuming and low‐efficiency process. In order to isolate pure and active PSII core complexes in large amounts, we have developed a fast method to isolate highly active monomeric and dimeric PSII core complexes from spinach leaves by using sucrose gradient ultracentrifugation.
Zhao-Gai, Wang, Tian-Hua, Xu, Cheng, Liu, Chun-Hong, Yang   +3 more
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Effects of polyaromatic hydrocarbons on photosystem II activity in pea leaves

Plant Physiology and Biochemistry, 2014
The acute effects of three typical polyaromatic hydrocarbons (PAHs): naphthalene (Naph), phenanthrene (Phen) and fluoranthene (Flu) on photochemical activity of photosystem II (PSII) in detached leaves of 3-week-old pea plants were studied. The leaves were exposed in water with PAHs under white light for 0.5-72 h.
Vladimir D, Kreslavski, Anton V, Lankin, Galina K, Vasilyeva, Valery Yu, Luybimov, Galina N, Semenova, Franz-Josef, Schmitt, Thomas, Friedrich, Suleyman I, Allakhverdiev   +7 more
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Carbonic anhydrase activity of different photosystem II preparations

1998
The requirement of the inorganic carbon (IC) for the proper electron transport activity of thylakoids has been notified far ago. The generally accepted view on the site of its action implies an involvement of IC in electron transfer on the acceptor side of Photosystem II [1].
O. V. Moskvin, A. Y. Razguliayeva, T. V. Shutova, M. S. Khristin, B. N. Ivanov, V. V. Klimov   +5 more
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Purification of highly active oxygen-evolving photosystem II from Chlamydomonas reinhardtii

Photosynthesis Research, 1990
A method is described for the isolation and purification of active oxygen-evolving photosystem II (PS II) membranes from the green alga Chlamydomonas reinhardtii. The isolation procedure is a modification of methods evolved for spinach (Berthold et al. 1981).
H, Shim, J, Cao, , Govindjee, P G, Debrunner   +3 more
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Oxygen evolution from hydrogen peroxide in photosystem II: flash-induced catalytic activity of water-oxidizing photosystem II membranes

Biochemistry, 1987
Water-oxidizing photosystem (PS) II membranes treated with hydrogen peroxide in the dark showed backward transition of their S/sub 0/ state to the S/sub -1/ state, as deduced from the pattern of flash-dioxygen yields. In the presence of hydrogen peroxide, they evolved oxygen after the first flash, as reported for thylakoids.
Junichi Mano, Masaaki Takahashi, Kozi Asada   +2 more
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