Results 251 to 260 of about 4,378,647 (283)

Cytochrome function in the cyclic electron transport pathway of chloroplasts

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1979
Flash excitation of isolated intact chloroplasts promoted absorbance transients corresponding to the electrochromic effect (P-518) and the alpha-bands of cytochrome b6 and cytochrome f. Under conditions supporting coupled cyclic electron flow, the oxidation of cytochrome b6 and the reduction of cytochrome f had relaxation half-times of 15 and 17 ms ...
R E, Slovacek, D, Crowther, G, Hind
openaire   +2 more sources

Distinct contribution of two cyclic electron transport pathways to P700 oxidation

Plant Physiology, 2022
Abstract Cyclic electron transport (CET) around Photosystem I (PSI) acidifies the thylakoid lumen and downregulates electron transport at the cytochrome b6f complex. This photosynthetic control is essential for oxidizing special pair chlorophylls (P700) of PSI for PSI photoprotection.
Qi Zhou, Hiroshi Yamamoto, Toshiharu Shikanai   +2 more
openaire   +2 more sources

Regulation of Photosynthesis by Cyclic Electron Transport Around Photosystem I

Advances in Botanical Research, 2020
Toshiharu Shikanai
exaly   +2 more sources

Ferredoxin-Dependent Cyclic Electron Transport and Photophosphorylation

1987
Several previous reports from this laboratory were concerned with the turnover of P-700 under a regime of repetitive flashes and with the involvement of the observed, kinetically identifiable components in electron transport. Thus, in the presence of ferredoxin and NADP, P-700 is reduced in at least two phases with relaxation times of approx.
Hans J. Rurainski, Sieglinde Borchert, Ralf Heupel   +2 more
openaire   +1 more source

Characteristics of cyclic electron transport in the cyanobacterium Phormidium laminosum

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1993
Abstract Cyclic photophosphorylation and ferredoxin-plastoquinone oxidoreductase (FQR) activity have been measured for the first time in the cyanobacterium Phormidium laminosum. They were found to be insensitive to inhibition by up to 10 μM antimycin, as well as to the similarly acting compound, J820.
Robert S. Manasse, Derek S. Bendall
openaire   +1 more source

Cyclic electron transport in isolated intact chloroplasts. Further studies with antimycin

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1978
Antimycin has been used to study the role of cyclic electron transport in isolated intact chloroplasts maintained under aerobic conditions. At all light intensities, antimycin inhibits CO2 fixation when assay conditions are optimal. When turnover of the Calvin cycle is inhibited, antimycin stimulates bicarbonate-dependent O2 evolution. Energy-dependent
J D, Mills, R E, Slovacek, G, Hind
openaire   +2 more sources

Functional homogeneity of P-700 in cyclic and non-cyclic electron transport reactions in thylakoids

Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1978
The photoinduced turnover of P-700 (the reaction center chlorophyll a of photosystem I) in higher plant thylakoids was examined at room temperature by observation of the kinetics and amplitude of the transmission signal at 700 nm. The concentration of P-700 functional in cyclic and non-cyclic electron transfer reactions was compared.
openaire   +2 more sources

Regulation of Photosynthesis via PSI Cyclic Electron Transport

2008
In higher plants PSI cyclic electron transport consists of PGR5-dependent and NAD(P)H dehydrogenase-dependent pathways. Characterization of the Arabidopsis mutants defective in the pathways indicate that PSI cyclic electron transport is essential for both protecting chloroplasts from photo-oxidative damage and supplying ATP for photosynthesis. Although
Toshiharu Shikanai, Yuki Okegawa
openaire   +1 more source

Evidence for a cyclic PS-II-electron transport in vivo

Plant Science Letters, 1980
Abstract The light-induced absorbance change of the center II P-680 reaction was investigated in autotrophically and photoheterotrophically cultivated Chlamydobotrys stellata . In addition the light-dark A 559 change was followed in order to look for a correlation between the kinetics of the cytochrome b -559 oxidation and the P-680 ...
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Protonic and cationic changes during cyclical cation transport driven by electron transfer

Biochemical and Biophysical Research Communications, 1981
Abstract Complexes I and III in mitochondrial particles mediate the coupling of electron transfer (NADH → Q; QH 2 → ferricytochrome c ) to either cyclical or net transport of K + . Cyclical transport was characterized by a U-shaped profile for the protonic and cationic changes observed during an oxygen pulse. The K + e and H +
D E, Green, H D, Vande Zande
openaire   +2 more sources