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Photosystem in Biological News

Pliable proteins keep photosynthesis on the light path

...plants have two photosystems that work in tandem: photosystem I and photosystem II. To peer at the inner workings of photosynthesi...le bacteria possess a simplified system similar to photosystem II. The center stage of photosynthesis is the r...

Turning sunlight into liquid fuels

...ater molecules within a complex of proteins called photosystem II, in which manganese-containing enzymes serve as...nganese-based organometallic complexes modeled off photosystem II have shown some promise as photocatalysts for w...obalt oxide nanocrystal clusters are comparable to photosystem II," said Frei. "When you factor in the abundance ...

Plugging in molecular wires

...ike plugs and sockets and can pass electrons on directly and nearly without loss. The new approach taken by the Japanese researchers cleverly connects photosystem I (PSI) from the blue-green algae Thermosynechococcus elongatus with a synthetic apparatus. An important component of the electron transmission sequen...

Mysterious microbe plays important role in ocean ecology

...t it is missing the entire set of genes needed for photosystem II and carbon fixation, essential parts of the mol... nitrogen in the ocean." During photosynthesis, photosystem II generates oxygen by splitting water molecules. ... night, or do it in specialized cells. The lack of photosystem II enables the new microbe to fix nitrogen during ...

Mysterious microbe may play important role in ocean ecology

...t it is missing the entire set of genes needed for photosystem II and carbon fixation, essential parts of the mol... nitrogen in the ocean." During photosynthesis, photosystem II generates oxygen by splitting water molecules. ... night, or do it in specialized cells. The lack of photosystem II enables the new microbe to fix nitrogen during ...

New technique enables assessment of drought performance

...id "We found that plants' viability during increasing water deficit could be measured and quantified by measuring changes to the maximum efficiency of photosystem II (Fv/Fm), and that this was easily measurable by chlorophyll fluorometry." Other methods of assessing plants' performance under water deficit hav...

Future for clean energy lies in 'big bang' of evolution

...nd mechanisms of photosynthesis, in particular the protein complex known as photosystem II, which breaks down the hydrogen atoms of water into their constituent protons and electrons to carry the energy derived from sunlight onto photosystem I, leading to production of carbohydrates and ultimately also the proteins ...

Berkeley researchers identify photosynthetic dimmer switch

...rvesting system consists of two protein complexes, photosystem I and photosystem II. Each complex features antennae made up of chl... triggers the formation of zeaxanthin molecules in photosystem II. These zeaxanthin molecules interact with excit...

Researchers visualize complex pigment mixtures in living cells

...ort-wavelength component originated primarily from photosystem II and was most intense near the periphery of the ...he long-wavelength component that is attributed to photosystem I, because it disappears in mutants lacking this p...akoid rings, with the inner thylakoids enriched in photosystem I. Vermaas said this means that even in a simpl...

Variable light illuminates the distribution of picophytoplankton

...his light also inactivates a key component of the photosynthetic apparatus, photosystem II. This Photoinactivation of photosystem II decreases photosynthesis and can even kill cells, unless they can counte...
Photosystem in Biological Technology

Solar cell directly splits water for hydrogen

...n the next best synthetic catalysts, and comparable to the turnover rate of photosystem II in green plant photosynthesis." photosystem II is the protein complex in plants that oxidizes water and starts the phot...

New Microarray Labeling Kit for Preparing cDNA Probes

...ted by adding the A. thaliana mRNA provided in the probe-labeling kit to the probe-labeling reaction. The amounts of A. thaliana photosystem I chlorophyll a/b-binding protein, rca and rbcL mRNA added to the probe-labeling reaction correspond to mRNA of high, medium, an...
Photosystem in Biological Definition

Photosystem

In the process of photosynthesis , light is absorbed by a photosystem (ancient Greek : phos = light and systema = assembly) to begin an energy-producing reaction. The photosytems are contained within the chloroplasts in the leaves of plants. Two types of photosystems exist: photosyste...

Photosystem

In the process of photosynthesis , light is absorbed by a photosystem (ancient Greek : phos = light and systema = assembly) to begin an energy-producing reaction. The photosytems are contained within the chloroplasts in the leaves of plants. Two types of photosystems exist: photosyste...

Photosynthesis

...s adenosine triphosphate (ATP), the main "energy currency" in cells. In photosystem I, the electrons are returned to the chlorophyll. In photosystem II, they are used to drive the reaction NADP + + H + + 2e − ...

Light-dependent reaction

... strikes a chlorophyll molecule contained within a photosystem (cluster of associated pigment molecules) and exci...he electron originates in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin...t, a photon is absorbed by the chlorophyll core of photosystem II, exciting two electrons which are transferred t...

Light-dependent reaction

... strikes a chlorophyll molecule contained within a photosystem (cluster of associated pigment molecules) and exci...he electron originates in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin...t, a photon is absorbed by the chlorophyll core of photosystem II, exciting two electrons which are transferred t...

Photosynthesis

...s adenosine triphosphate (ATP), the main "energy currency" in cells. In photosystem I, the electrons are returned to the chlorophyll. In photosystem II, they are used to drive the reaction NADP + + H + + 2e − ...
Photosystem in Biological Dictionary

Photosystem

Photosystems are protein complexes involved in photosynthesis. They are found in the thylakoid membranes of plants, algae and cyanobacteria, or in the cytoplasmic membrane of photosynthetic bacteria. A photosystem is an... Photosystem I (PS I) is the second photosystem in the photo...

Photophosphorylation

... energy coupling sites of photophosphorylation . ... Electron transport and photophosphorylation in chloroplasts as a function of the ... I. photosystem II Cyclic Photophosphorylation Catalyzed by p-Phenylenediamine ... Electron transport and photophosphorylation in chloroplasts as a function of ...

Photolysis

...tolysis ... Photolysis . Clickable map of the Light Dependent Reactions ... Photolysis involves a poorly understood proteins associated with photosystem II. ... Photolysis occurs on the lumen side of the thylakoid membrane. ... However, photolysis and noncyclic electron flow do not generate...

Cyclic electron flow

...ectron flow acts in flexible relationship with the water–water cycle to ... Cyclic electron flow is the simplest pathway, but involves only photosystem I ... cyclic electron flow , electrons ejected from P700 reach ferredoxin and flow back ... which molecule undergoes oxidation and red...
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