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The Evolution of Light-Harvesting Antennas-- B.R.
This book provides a comprehensive treatment of all aspects of photosynthetic light-harvesting antennas, from the biophysical mechanisms of light absorption and energy transfer to the structure, biosynthesis and regulation of antenna systems in whole organisms.
The model that emerges is that of some 300 chlorophyll molecules and 40 or so and other acting as a light harvesting antenna surrounding one chlorophyll a molecule that is a part of an action center. A photon is absorbed by one of the pigment molecules and transfers that energy by successive events to neighboring molecules until it reaches the action center where the energy is used to transfer an energetic electron to an electron acceptor.
Light harvesting complex - photosynthesis - YouTube
Plants, algae and photosynthetic bacteria, havedeveloped efficient systems to harvest the light of the sun and usethis energy to drive the metabolic reactions required for life, suchas the reduction of carbon dioxide to sugar.
The capture of light energy for is enhanced by networks of in the arranged in aggregates on the thylakoids. These aggregates are called antennae complexes. Evidence for this kind of picture came from research by Robert Emerson and William Arnold in 1932 when they measured the oxygen released in response to extremely bright flashes of light. They found that some 2500 molecules of was required to produce one molecule of oxygen, and that a minimum of eight photons of light must be absorbed in the process.
Light-harvesting complex - an overview | ScienceDirect …
A photosystem comprises a reaction center surrounded by light-harvesting or antenna complexes that contain chlorophyll, carotenoids, and other photosynthetic pigments, as well as the associated proteins.
The main function of the light-harvesting complexes is to gatherlight energy and to transfer this energy to the reaction centers forthe photo-induced redox processes.Much of the knowledge about the Carotenoid LHC's was originallyderived from studies on purple photosynthetic bacteria that reside atgreat depth below the waters surface.
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Carotenoids in Light Harvesting Complexes
Scientists have long been trying to emulate the way in which plants harvest energy from the sun through photosynthesis. Plants are able to absorb photons from even weak sunlight using light antennae made from chlorophyll molecules in their leaves. This absorbed energy is then transferred to reaction centers wherein the plants create the sugars they use as food. So far, artificial systems built to replicate this super-efficient natural process have been limited to a single reaction center with a few light absorbers, and have been unable to absorb enough energy from light sources with low photon levels such as sunlight.
Dynamics of Light Harvesting in Photosynthesis
Now, Osamu Ishitani at the Tokyo Institute of Technology, along with researchers from Toyota Central R&D Labs, Inc., has created an efficient, artificial light-harvesting system based on the natural two-step process of photosynthesis. The new system uses man-made 'leaves' as light absorbers, which relay energy through a metal complex to feed a final energy acceptor.
Light-harvesting: Mimicking photosynthesis with man …
The meeting will be chaired by (Structure & Regulation in Photosynthesis Lab, Leiden University), and will bring together international photosynthesis biochemistry, biophysics and structural/molecular biology experts for open scientific discussion on emerging questions and hypotheses. The meeting covers 6 themes varying from Quantum Biology of Light Harvesting to Evolutionary Aspects and Light Adaptation and will address the role of flexible light harvesting in adjusting photosynthesis to fluctuating environmental conditions.
Photosynthetic Light Harvesting ..
The researchers created a device with 440 'leaves' using tubes made from so-called periodic mesoporous organosilica (PMO) and light-absorbing biphenyl (Bp). The PMO-Bp complexes were linked to five connected rhenium metal sticks, which transferred the light energy harvested by PMO-Bp directly to a central ruthenium sphere. In this way, the photons from the light source were concentrated very efficiently, first through the rhenium sticks and then into the ruthenium reaction center, with little loss of energy en-route.
Light-Harvesting Antennas in Photosynthesis (Advances …
The Light Harvesting Satellite Meeting is a satellite meeting of the , held in Maastricht, The Netherlands, and focuses on natural photosynthetic light harvesting.
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