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Showing 1 to 20 of 24 for “"Photosystem I"”.
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Generation of photocurrent from Photosystem I biomolecular complexes
Photosynthetic proteins are used in organic devices to generate photocurrent. A setup consisting of a monochromator and lock-in amplifiers is used to measure the photocurrent along with an HP4156 analyzer. Atomic force microscopy images are also taken including those taken with a voltage-biased …
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The Structure and Function of Chlorophyll-Proteins in Photosystem I and The Light Harvesting Complex of Photosystem Ii
… Two of these membrane-bound complexes, Photosystem I (PS I) and Photosystem II (PS II), consist in part of chlorophyll proteins. The chlorophyll-protein function to absorb incident light energy and to transfer absorbed energy to photochemical reaction centers where charge separation …
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Investigation of the Physiology of Hydrogen Production in the Green Alga Chlamydomonas reinhardtii Using Spectral-Selective Photosystem I Light
… and the development of a spectral-selective photosystem I activating/photosystem II deactivating light (PSI-light) method provides a promising platform for commercial hydrogen production systems. The PSI-light method allows electrons to pass through the photosynthetic electron transport chain …
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Photosynthetic electron transport in cyanobacteria
… carry out photosynthetic electron transfer, photosystem II, the cytochrome bf complex and photosystem I. To elucidate photosynthetic electron transport in oxygenic photosynthesis site-directed mutagenesis and biophysical techniques were employed in cyanobacteria which have the advantage over …
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Role of Bicarbonate and of Manganese in Photosystem Ii Reactions of Photosynthesis
… examines some of the reactions associated with Photosystem II. On the reducing side of Photosystem II, the role of bicarbonate ion on electron transport from Photosystem II to Photosystem I was established and on the oxidizing side studies were carried out to examine the involvement of manganese …
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Photoprotection and chloroplast regulation in the green algae Chlamydomonas reinhardtii
… the expression of the chloroplast encoded photosystem I subunit, psaA, using a forward genetic screen. In chapter 2 I show that the qE mutant, npq4lhcsr1, displays decreased growth under a sinusoidal light regime mimicking natural oscillations in irradiance. This reduction in growth rate …
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Characterization of the composition and activity of the photosynthetic apparatus in chloroplasts
… components were determined: active and inactive photosystem II, photosystem I, cytochrome b/f, high-potential cytochrome b-559, the rate of uncoupled electron transport, and the ratio of chlorophyll a to b. In leaves the amounts of the photosynthetic components per leaf area, the fresh weight per …
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Characterization of cytochromes and plastocyanin in the cyanobacterium Synechocystis sp. PCC 6803
… transport between the cytochrome bf complex and photosystem I in the unicellular cyanobacterium Synechocystis 6803. Two soluble proteins, the heme-protein cytochrome c553 and the copper protein plastocyanin, were isolated from this species and specific antibodies were raised to each protein. …
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ΑΛΛΗΛΕΠΙΔΡΑΣΕΙΣ ΙΟΝΤΩΝ ΚΑΙ ΠΡΟΣΑΝΑΤΟΛΙΣΜΕΝΩΝ ΘΥΛΑΚΟΕΙΔΩΝ ΚΥΑΝΟΒΑΚΤΗΡΙΩΝ
… CAPABLE OF COUPLED ELECTRON TRANSPORT TO POST-PHOTOSYSTEM I, ELECTRON ACCEPTORS. THE IONIC CONTROL OF PHOTOELECTRON TRANSPORT OPERATES VIA PROCESSES SUCH AS SCREENING AND NEUTRALIZATION OF THE STATIC NEGATIVE ELECTRIC CHARGE AT THE CYTOPLASMIC SURFACE OF THE THYLAKOIDS, AS WELL AS VIA …
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Iron and Prochlorococcus/
… bonds that connect iron atoms to components of photosystem I, the most efficient light-harvesting complex in nature. Yet, we know little of how iron influences microbial diversity and distribution in the open ocean. In this study, we assess the influence of iron on the ecology of the numerically …
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Photovoltaic devices using photosynthetic protein complexes
… R. sphaeroides. The other protein being used is Photosystem I (PSI), a much larger complex, which is isolated from spinach chloroplasts. Electronic integration of devices is achieved by depositing organic semiconducting protective layer over a self-assembled monolayer of photosynthetic reaction …
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Gepulste Elektronenspinresonanz an Radikalpaaren der Photosynthese: Nachweis von photochemisch induzierten Kernkohärenzen
… am <br>sekundären Radikalpaar berichtet, das im Photosystem I als kurzlebiges <br>Intermediat auftritt. Hauptziel der Untersuchungen war der experimentelle <br>Nachweis photochemisch induzierter Kernkohärenzen. <br>Im ausgewählten EPR-Experiment startet ein Laserimpuls die photosynthetische …
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Comparison of two measures of PSI electron transport in winter rye
The number of P700 (the reaction centre of Photosystem I) converted to P700+, in winter rye, was determined by measuring the absorbance change at 820nm . It was found, with a single turnover flash, that thylakoids isolated from cold grown plants have a 50% greater number of P700 oxidized than …
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Zeitaufgelöste EPR-Untersuchungen zur Struktur und Dynamik von Radikalpaar-Intermediaten in photosynthetischen Reaktionszentren und Modellsystemen
… das sekundäre Radikalpaar P700+A1- im Photosystem I des Cyanobakteriums Synechococcus lividus, sowie die sequentiellen Radikalpaare des photosynthetischen Modellsystems ZCPINI. <br>Schwerpunkt der Untersuchungen zum sekundären Radikalpaar P865+QA- des photosynthetischen …
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Field trials to phenotype transgenic tobacco plants with improved RuBP regeneration
… of electrons from the cytochrome b6f complex to photosystem I. These plants were tested in field conditions as single, double (bifunctional FBPase/SBPase + cytochrome c6) and triple (bifunctional FBPase/SBPase + cytochrome c6 + H-protein) gene manipulations. To determine if the transgenic plants …
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Strategies for the selection, identification and improvement of microalgae strains for enhanced biofuel production
… molecular markers including the 18S rDNA, photosystem I P700 chlorophyll a apoprotein A2, and the internal transcribed spacer genes were used. In addition, in order to improve microalgae strains for biofuel production a stable plastome transformation method to genetically improve feedstock …
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Identification of a Low Molecular Weight Protein Tyrosine Phosphatase and Its Potential Physiological Substrates in Synechocystis sp. PCC 6803
… peptide-mass fingerprinting analysis, as PsaD (photosystem I subunit II) and CpcD (phycocyanin rod linker protein). In addition, several phosphotyrosine proteins were detected from the soluble and membrane fractions of Synechocystis sp. PCC 6803 cell extracts by in vitro substrate trapping as …
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Interactions of paraquat and nitrodiphenylether herbicides with the chloroplast photosynthetic electron transport in the activation of toxic oxygen species
… the site of inhibition. Rabbit sera inhibited photosystem I (PSI) Hill reactions, but did not inhibit a photosystem II (PSI II) Hill reaction indicating that inhibition is on the reducing side of PSI. It would be expected that a H₂O → Ferredoxin (Fd)/NADP Hill reaction should also be blocked. …
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Iron and Prochlorococcus
… bonds that connect iron atoms to components of photosystem I, the most efficient light-harvesting complex in nature. Yet, we know little of how iron influences microbial diversity and distribution in the open ocean. In this study, we assess the influence of iron on the ecology of the numerically …
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