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Electron transport and photophosphorylation by Photosystem I in vivo in plants and cyanobacteria
Under high light intensities where CO2 can limit photosynthesis, the proton gradient established by coupled cyclic electron transport can prevent over-reduction of the electron transport system by increasing thermal de-excitation in Photosystem II (Weis and Berry 1987). Expand
Photoacoustic measurements in vivo of energy storage by cyclic electron flow in algae and higher plants.
The capacity for energy storage by PSI-cyclic electron flow alone was found to be small in comparison to that of linear and cyclic electron flows combined but may be significant, nonetheless, under conditions when photosystem II is damaged, particularly in cyanobacteria. Expand
Characterization of damage to photosystems I and II in a cyanobacterium lacking detectable iron superoxide dismutase activity.
Even though the sodB mutant was more sensitive to damage by active oxygen than wild-type cells, both strains were equally sensitive to the photoinhibition of photosystem II caused by exposure to strong light. Expand
Chloroplast iron-sulfur cluster protein maturation requires the essential cysteine desulfurase CpNifS
Findings indicate that CpNifS is necessary for the maturation of all plastidic Fe-S proteins and, thus, essential for plant growth. Expand
Photoinhibition and light-induced cyclic electron transport in ndhB(-) and psaE(-) mutants of Synechocystis sp. PCC 6803.
It is concluded that photoinhibitory light induces sufficient PSI-driven cyclic electron transport in both the ndhB(-) and psaE(-) mutants to fulfill any role that cyclic electrons transport plays in protection against photoinhibition. Expand
Photoacoustic Analysis Indicates That Chloroplast Movement Does Not Alter Liquid-Phase CO2 Diffusion in Leaves of Alocasia brisbanensis12
Resistance for CO2 estimated from oxygen permeability was in good agreement with published values, validating photoacoustics as another way of assessing internal resistances to CO2 diffusion to reduce CO2 limitation of photosynthesis. Expand
The photoacoustic (PA)? technique is becoming an increasingly popular method in photosynthesis research. The PA effect, which is the production of sound by modulated light, was first described byExpand
The effects of photooxidative stress on photosystem I measured in vivo in Chlamydomonas
The effect of chloroamphenicol suggests a role for chloroplast-encoded proteins in protecting photosystem I against photooxidative damage caused by methyl viologen. Expand
Changes in the cyanobacterial photosynthetic apparatus during acclimation to macronutrient deprivation
In the modified photosynthetic apparatus of nutrient-deprived cells, a much larger fraction of the photosynthesis activity is driven by Photosystem I than in nutrient-replete cells. Expand
Acclimation of the Photosynthetic Apparatus to Growth Irradiance in a Mutant Strain of Synechococcus Lacking Iron Superoxide Dismutase
An altered acclimation to growth irradiance in the sodB mutant is suggested in which the stoichiometry between PSI and PSII is adjusted to compensate for the loss of PSI efficiency occurring under high growth irradiances. Expand