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Showing 1 to 20 of 68 for “"Psii"”.
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Effect of Ozone on CO2 Assimilation and PSII Function in Plants with Contrasting Pollutant Sensitivities
… field conditions) on net CO2 assimilation and PSII function in plants with different sensitivities to ozone. Two species of plants, tobacco (Nicotiana tabacum L.) and black cherry (Prunus serotina) were studied. Gas exchange analysis and chlorophyll fluorometry were utilized to characterize …
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Heterogeneity of photosystem II as it occurs in domain specific regions of the thylakoid membrane of spinach (spinacia oleracia L.)
… partitioning. The significance of PSlla and PSII~ centres have been described extensively in the literature. Previous work has characterized two types of PSII centres which are proposed to exist in different regions of the thylakoid membrane. a-centres are suggested to aggregate in stacked …
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Action of Allelochemicals on Algal Growth and Photosystem Ii Efficiency
… on unicellular algal growth and photosystem II (PSII) efficiency. Chlorella pyrenoidosa Chick and Selenastrum capricornutum Printz were the bioassay species. Fourteen of the 15 allelochemicals investigated resulted in a significant decrease in C. pyrenoidosa growth; 7 caused more than 10% …
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Proteomics Assisted Discovery Of Novel Proteins In Assembly And Regulation Of Photosystem II
… environmental conditions. Photosystem II: PSII) is a large membrane protein complex that performs the water oxidation reactions of the photosynthetic electron transport chain in cyanobacteria, algae, and plants. Subsequently, we also performed an accurate mass tag: AMT) high-sensitivity …
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Towards reverse engineering of Photosystem II: Synergistic Computational and Experimental Approaches
ABSTRACT Photosystem II (PSII) of oxygenic photosynthesis has the unique ability to photochemically oxidize water, extracting electrons from water to result in the evolution of oxygen gas while depositing these electrons to the rest of the photosynthetic machinery which in turn reduces CO2 to …
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Variability of phytoplankton production rates in the Atlantic Ocean as observed using the Fast Repetition Rate Fluorometer
… the functional absorption cross section (σ<sub>PSII</sub>) and the quantum yield of photochemistry (F<sub>v</sub>/F<sub>m</sub> which relate to the rate at which photosystem II (PSII) saturates with light and the proportion of functional PSII reaction centres, respectively. Changes in both …
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Use of Protein Crosslinking and Tandem Mass Spectrometry to Study the PsbO, PsbP and PsbQ Extrinsic Proteins of Higher Plant Photosystem II
Photosystem II (PSII) is a light-driven, water plastoquinone oxidoreductase present in all oxygenic photosynthetic organisms. The oxygen evolution process is catalyzed by the Mn4CaO5 cluster and an ensemble of intrinsic and extrinsic proteins which are associated with the photosystem. This metal …
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Photoelectrochemical tandem cells with enzymes wired to hierarchically-structured electrodes for solar fuel synthesis
… light absorption by photosystem (PS) I and II. PSII, the first photosynthetic enzyme, is capable of photocatalytic water oxidation, a bottleneck reaction in artificial photosynthesis. The study of PSII in protein film photoelectrochemical (PF-PEC) platforms sheds light into its biological …
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Automated PAM Fluorometry as a Tool to Evaluate the Photosynthetic Response of Undaria pinnatifida to Experimental Warming
… efficiency of U. pinnatifida’s photosystem II (PSII). Inspection of the multi-day time series of alpha revealed a significant decline in PSII efficiency under constant temperature, suggesting that the experimental setup was unable to maintain stable PSII performance. Therefore, the second …
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Computational Insights Into The Oxygen Evolving Complex Of Photosystem ΙΙ
… Oxygen Evolving Complex (OEC) of Photosystem II (PSII) is a unique Mn4O5Ca2+ cluster that catalyzes the photoactivated water splitting reaction. The OEC is a model system for bio-inspired artificial systems to use solar energy to pull electrons from water to produce fuel. The OEC goes through a …
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An Investigation of Plant Hypersensitive Response and Photosynthesis Inhibition on a Genomic and Physiological Scale
… of plants treated with photosystem II (PSII) inhibiting herbicides, atrazine and bentazon, (2) examining protein expression of the PSII reaction center subunit D1 in leaves infected with the bacterial pathogen Pseudomonas syringae, (3) analyzing the effect of the PSII inhibiting …
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Experimental and theoretical studies of the photosystem II reaction center: Implications for bicarbonate binding and function
… in bicarbonate binding in the photosystem II (PSII) reaction center, arginines 257 and 269 of the D1 polypeptide (D1-R257 and D1-R269) near the putative bicarbonate binding sites, the non-heme iron and the Q$\sb{\rm B}$ binding niche, were mutated in a unicellular green alga Chlamydomonas …
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Influences of elevated atmospheric CO₂ and water stress on photosynthesis and fluorescence of loblolly pine, red maple, and sweetgum
… acclimation. Photochemical efficiency of PSII declined with water stress in loblolly pine. Red maple and sweetgum showed no relationship between photochemical efficiency of PSII and simulated drought. Growth in elevated C0₂ did not influence this response in loblolly pine, but sweetgum …
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Effect of O3 fumigation on photosynthesis and growth of quinoa and its interaction with drought and elevated CO2
… photochemical efficiency, active photosystem II (PSII) reaction centres per leaf cross section and increase in non-photochemical dissipation. Drought-induced plants had higher fluorescence intensity at the J-phase compared to the well-watered plants, indicating a decrease in the electron transport …
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Computational Analysis of the Proton Transfer to the Secondary Quinone of Type II Photosynthetic Reaction Centers.
… RC, nämlich des pflanzlichen Photosystem II RC (PSII RC) und dessen evolutionären Vorfahren, dem bakteriellen RC (bRC), sind in zwei (pseudo)-symmetrischen Zweigen angeordnet, dem A- und dem B-Zweig. In Typ II RC Proteinen werden die Elektronen entlang des A-Zweiges auf QB übertragen, während der …
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Light energy management in peach: utilization, photoprotection , photodamage and recovery. Maximizing light absorption in orchard is not always the best solution
… consuming recovery system. Since the damaged PSII is quickly repaired with energy expense, it would be interesting to investigate how much PSII recovery costs to plant productivity. This PhD. dissertation purposes to improve the knowledge about the several strategies accomplished for managing …
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Functional analysis of plastid-encoded genes
… The ycf9 gene product was exclusively located in PSII core complexes. This localization was based on the isolation of protein complexes released from thylakoids by controlled, partial lysis, followed by sucrose density gradient centrifugation or 2D gel electrophoresis. This finding revised data of …
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High Light and Low Temperature Effect on D1 Synthesis and Turnover in the Chilling Sensitive Plant Lycopersicun Esculentum
… synthesis of D1, a component of photosystem II (PSII) reaction center which is known to be damaged by high light. The decrease in D1 synthesis was not due to changes in the steady state level of psbA, D1 message. An increase in psbA mRNA association with ribosomes along with pausing during …
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Biologically inspired materials for electro-responsive coatings and the photo-oxidation of water
… oxidation was developed using photosystem II (PSII) as a model. Proteins form the structural scaffold for PSII, assembling dye molecules as well as the metal-oxo catalytic center; furthermore, peptides play an active role in shuttling charge throughout PSIL. The D1 peptide in PSII is an …
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Multiple Herbicide Resistance in Waterhemp
… also resistant to atrazine, a photosystem II (PSII)-inhibiting herbicide. A waterhemp line selected for multiple herbicide resistance, designated R biotype, was compared in all experiments to a herbicide-susceptible (S) biotype in order to characterize resistance to ALS, PSII, and PPO …
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