• Publications
  • Influence
UV-B radiation-induced donor- and acceptor-side modifications of photosystem II in the cyanobacterium Synechocystis sp. PCC 6803.
We studied the effect of UV-B radiation (280-320 nm) on the donor- and acceptor-side components of photosystem II in the cyanobacterium Synechocystis sp. PCC 6803 by measuring the relaxation ofExpand
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Quenching of the system II chlorophyll fluorescence by the plastoquinone pool.
Abstract If 3-(3,4-dichlorophenyl)-1,1-dimethylurea is added to dark adapted chloroplasts, the maximum fluorescence F stat when Q is completely reduced, is lower than the maximum fluorescence reachedExpand
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Influence of DCMU and ferricyanide on photodamage in photosystem II.
The effect of strong illumination of thylakoid membranes was studied under a range of conditions. Under anaerobic conditions, the relatively small quenching of the maximum fluorescence (Fmax) isExpand
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Kinetics of photoacclimation in response to a shift to high light of the red alga Rhodella violacea adapted to low irradiance.
The unicellular rhodophyte Rhodella violacea can adapt to a wide range of irradiances. To create a light stress, cells acclimated to low light were transferred to higher irradiance and the kineticsExpand
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UV-B radiation induced exchange of the D1 reaction centre subunits produced from the psbA2 and psbA3 genes in the Cyanobacterium synechocystis sp. PCC 6803.
UV-B irradiation of Synechocystis 6803 cells inhibits photosystem II activity, which can be restored via de novo synthesis of the D1 (and D2) reaction center subunits. Recently we have shown that ofExpand
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Photosystem II fluorescence quenching in the cyanobacterium Synechocystis PCC 6803: involvement of two different mechanisms.
The structural changes associated to non-photochemical quenching in cyanobacteria is still a matter of discussion. The role of phycobilisome and/or photosystem mobility in this mechanism is a pointExpand
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Midpoint potential of signal II (slow) in Tris-washed photosystem-II particles
In Tris-washed Photosystem-II particles we are able to induce an EPR signal in the dark by addition of an iridium salt (K2IrCl6). This signal is attributed to signal IIs (slow) (D+) and the redoxExpand
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State transitions or delta pH-dependent quenching of photosystem II fluorescence in red algae.
Fluorescence changes attributed to state transitions have been shown to exist in phycobilisome-containing organisms. Contradictory conclusions have been derived from studies about the mechanism ofExpand
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Induced New Mutation of D1 Serine-268 in Soybean Photosynthetic Cell Cultures Produced Atrazine Resistance, Increased Stability of S2QB - and S3QB - States, and Increased Sensitivity to Light Stress
We have isolated several herbicide-resistant cell lines from photosynthetic cell suspensions of soybean (Glycine max) that possessed different levels of herbicide resistance, photosystem II activity,Expand
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New results on the properties of photosystem II centers blocked by 3-(3,4-dichlorophenyl)-1,1-dimethylurea in their different photoactive states.
  • A. Etienne
  • Chemistry, Medicine
  • Biochimica et biophysica acta
  • 22 February 1974
We have studied the 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) action on the different S states by oxygen, fluorescence and luminescence measurements. We show that no oxygen is evolved during aExpand
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