Results 121 to 130 of about 1,487 (149)
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P700 oxidation suppresses the production of reactive oxygen species in photosystem I
Advances in Botanical Research, 2020Riu Furutani +2 more
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Distinct contribution of two cyclic electron transport pathways to P700 oxidation
Plant Physiology, 2022Abstract 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 +2 more
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Heat-induced changes in the efficiency of P700 photo-oxidation in pea chloroplast membranes
Journal of Photochemistry and Photobiology B: Biology, 1990Abstract The influence of short-time heat stress (5 min at 50 °C) on the photo-oxidation of the reaction center pigment of photosystem I (P700) under continuous illumination of pea chloroplasts was studied. It was found that heating leads to a considerable increase in P700 + , measured by the amplitude of the electron spin resonance signal I ...
Alexander G Ivanov, Maya Velitchkova
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Stark signals associated with the reduced and oxidized states of P700 in P700-enriched particles
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1993Abstract Quadratic Stark effect was measured in the red and near infrared spectral regions for Photosystem I particles devoid of most antenna pigments, with the chlorophyll/P700 ratio of 11. Stark spectra of reduced primary electron donor exhibit a strong band at 701 nm, corresponding to a change in permanent dipole moment Δμ = 5–5.3 D.
Stanisław Krawczyk, Isamu Ikegami
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P700 oxidation and energy transfer in normal maize and in carotenoid-deficient mutants
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1970Abstract 1. Particles enriched in System 1 and 2, respectively, were prepared by digitonin fragmentation of chloroplasts from normal maize and from mutants which accumulate lycopene or ζ-carotene instead of the normal carotenoids and which have a reduced chlorophyll content.
A, Faludi-Dániel, J, Amesz, A H, Nagy
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Biochemistry, 2001
Light-induced Fourier transform infrared (FTIR) difference spectroscopy has been used to study the photo-oxidation of the primary electron donor (P700) in PS I particles from Chlamydomonas reinhardtii and Synechocystis sp. PCC 6803. To aid in the interpretation of the spectra, PS I particles from a site-directed mutant of C.
G, Hastings +4 more
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Light-induced Fourier transform infrared (FTIR) difference spectroscopy has been used to study the photo-oxidation of the primary electron donor (P700) in PS I particles from Chlamydomonas reinhardtii and Synechocystis sp. PCC 6803. To aid in the interpretation of the spectra, PS I particles from a site-directed mutant of C.
G, Hastings +4 more
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Calculation of absolute photosystem I absorption cross-sections from P700 photo-oxidation kinetics
Photosynthesis Research, 1991A procedure is described which permits determination of the absolute absorption cross-section of a photosynthetic unit from the kinetics of reaction center photo-oxidation under weak, continuous actinic illumination. The method was first tested on a simple model compound of known absorption cross-section.
Warren R Zipfel, Thomas G Owens
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Spectral Hole Burning in Cyanobacterial Photosystem I with P700 in Oxidized and Neutral States
The Journal of Physical Chemistry B, 2016We explored the rich satellite hole structures emerging as a result of spectral hole burning in cyanobacterial photosystem I (PSI) and demonstrated that hole burning properties of PSI, particularly at high resolution, are strongly affected by the oxidation state of the primary donor P700, as P700+ effectively quenches the excitations of the lowest ...
Nicoleta, Herascu +6 more
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Russian Journal of Plant Physiology, 2010
Absorbance changes ΔA810 were measured in pea (Pisum sativum L., cv. Premium) leaves to track redox transients of chlorophyll P700 during and after irradiation with far red (FR) light under various preillumination conditions in the absence and presence of inhibitors and protonophorous uncoupler of photosynthetic electron transport.
Alexander A Bulychev +2 more
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Absorbance changes ΔA810 were measured in pea (Pisum sativum L., cv. Premium) leaves to track redox transients of chlorophyll P700 during and after irradiation with far red (FR) light under various preillumination conditions in the absence and presence of inhibitors and protonophorous uncoupler of photosynthetic electron transport.
Alexander A Bulychev +2 more
exaly +2 more sources
Stromal Over-reduction by High-light Stress as Measured by Decreases in P700 Oxidation by Far-red Light and its Physiological Relevance [PDF]
Plant and Cell Physiology, 2005 The oxidation level of P700 induced by far-red light (DeltaA(FR)) in briefly dark-treated leaves of some sun plants decreased during the daytime and recovered at night. The dark recovery of decreased DeltaA(FR) proceeded slowly, with a half-time of about 5 h.
Tsuyoshi Endo +2 more
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