Results 221 to 230 of about 75,367 (254)

Dissection of respiratory and cyclic electron transport in Synechocystis sp. PCC 6803

Journal of Plant Research, 2022
Cyclic electron transport (CET) is an attractive hypothesis for regulating photosynthetic electron transport and producing the additional ATP in oxygenic phototrophs. The concept of CET has been established in the last decades, and it is proposed to function in the progenitor of oxygenic photosynthesis, cyanobacteria.
Shoko Kusama, Chikahiro Miyake, Shuji Nakanishi, Ginga Shimakawa   +3 more
openaire   +2 more sources

In vivo temperature dependence of cyclic and pseudocyclic electron transport in barley

Planta, 2001
The effect of temperature on the rate of electron transfer through photosystems I and II (PSI and PSII) was investigated in leaves of barley (Hordeum vulgare L.). Measurements of PSI and PSII photochemistry were made in 21% O2 and in 2% O2, to limit electron transport to O2 in the Mehler reaction.
Clarke, Joanne E., Johnson, Giles N.; id_orcid 0000-0003-1536-5582   +1 more
openaire   +3 more sources

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

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

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

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 ...
openaire   +1 more source

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

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

Role of cyclic electron transport in photosynthesis as measured by the photoinduced turnover of P700 in vivo

Biochemistry, 1976
The light-induced turnover of P700 was measured spectrophotometrically in a wide variety of algae and some photosynthetic mutants. Analysis of the postillumination recovery of P700+ revealed that the apparent first-order rate constant for reduction via the cyclic pathway was much lower that that via the noncyclic pathway.
P C, Maxwell, J, Biggins
openaire   +2 more sources