Chapter 9: Photosynthesis Flashcards | Quizlet
Hypothesis: The rate of photosynthesis in the water plant hydrilla will change as the rate of carbon dioxide changes.
Light Harvesting Complexes In Photosynthesis - …
Utilization of CO2 for production of energy-rich carbon compounds using solar light as an energy source has been a very attractive research field because it can solve serious global problems, i.e., energy crisis, depletion of carbon resources, and global warming. Exhaust gases discharged from heavy industries include relatively low concentrations of CO2. As a typical example, exhaust gas from fire power plants includes only 3%–13% CO2 with N2 as the main component; however, most research on photochemical and electrochemical reduction of CO2 have been conducted using pure CO2 to achieve high reaction rates of the active reaction intermediates with CO2. This is problematic because condensation of CO2, achieved by adsorption and desorption processes with amines and MOFs or separation with filters, is a highly energy-consuming process. If low concentrations of CO2 can be directly utilized, a highly promising technology can be developed. To the best of our knowledge, there has been only one report of a visible-light driven photocatalytic reduction system for low concentrations of CO2, of which catalyst was integrated into MOF as CO2 adsorption active sites. Although the MOF system could reduce even 5% concentration of CO2 with about 1.3 times higher efficiency compared to that of the corresponding homogeneous system without MOF, its photocatalysis is not satisfactory because of low durability (TONHCOOH = 33.3) and low selectivity of CO2 reduction (71% with H2 evolution; TONH2 = 14.5). In natural photosynthesis, plants have acquired elaborate systems during the evolutionary process to solve the above-mentioned problem, i.e., the Hatch–Slack cycle for concentration of CO2 and the Calvin cycle for CO2 reductive fixation. A novel photocatalytic system with a different working principle for CO2 condensation is required for the development of artificial photosynthesis research.
We have shown that many of the quantum effects observed in photosynthetic complexes are artefacts of the ultrafast laser excitation and are not relevant for biological function in incoherent sunlight.
Photosynthetic reaction centre - Wikipedia
What next? All of that captured light energy needs to be converted into a different form; that's the whole point of photosynthesis. We aren't quite ready for that, though. The light harvesting complex just collects the light; the nearby reaction center is where the conversion process begins. You can think of the light harvesting complex as an antenna or as a funnel that sends energy to the reaction center, where the process of converting the energy into ATP (and, later, carbohydrates) will begin.
Our results call into question the suggested role of ENAQT in the photosynthetic process of green sulfur bacteria and highlight the subtleties associated with drawing lessons for designing biomimetic light-harvesting complexes.
A photosynthetic reaction centre is a complex of ..
In this Account, we describe our strategy of hybrid photocatalysts using semiconductors as light harvesters with biomimetic complexes as molecular cocatalysts to construct efficient and stable artificial photosynthetic systems. We chose semiconductor nanoparticles as light harvesters because of their broad spectral absorption and relatively robust properties compared with a natural photosynthesis system. Using biomimetic complexes as cocatalysts can significantly facilitate charge separation via fast charge transfer from the semiconductor to the molecular cocatalysts and also catalyze the chemical reactions of solar fuel production. The hybrid photocatalysts supply us with a platform to study the photocatalytic mechanisms of H2/O2 evolution and CO2 reduction at the molecular level and to bridge natural and artificial photosynthesis. We demonstrate the feasibility of the hybrid photocatalyst, biomimetic molecular cocatalysts, and semiconductor light harvester for artificial photosynthesis and therefore provide a promising approach for rational design and construction of highly efficient and stable artificial photosynthetic systems.
Through reading various books and web pages it was made clear that carbon dioxide is definitely one of the raw materials needed for photosynthesis, but I wanted to see whether this is actually true and if carbon dioxide is taken away completely will the plant photosynthesize at all.
a large variety in light-harvesting complexes exist between the ..
Antenna Complexes for Photosynthesis - HyperPhysics …
Photosynthesis mainly takes place in the Palisade Mesophyll cells, which are situated near the top of the leaf....
Light-harvesting complex - Wikipedia
Photosynthesis takes place in only the green parts of plants, which the green part are chlorophyll pigments.
Light-dependent reactions - Wikipedia
Chloroplast: Chloroplast, structure within the cells of plants and green algae that is the site of photosynthesis.
Light-dependent reactions of photosynthesis at the thylakoid ..
Hypothesis:Photosynthesis is a process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose....
Photosynthesis occurs in chloroplasts that contain ..
The occurrence of photosynthesis is very important to us as humans, because it provides us with the oxygen we need to breathe and plants are at the bottom of every food-chain and so without them, I would collapse....
Cytochrome b6f complex - Wikipedia
Solar fuel production through artificial photosynthesis may be a key to generating abundant and clean energy, thus addressing the high energy needs of the world’s expanding population. As the crucial components of photosynthesis, the artificial photosynthetic system should be composed of a light harvester (e.g., semiconductor or molecular dye), a reduction cocatalyst (e.g., hydrogenase mimic, noble metal), and an oxidation cocatalyst (e.g., photosystem II mimic for oxygen evolution from water oxidation). Solar fuel production catalyzed by an artificial photosynthetic system starts from the absorption of sunlight by the light harvester, where charge separation takes place, followed by a charge transfer to the reduction and oxidation cocatalysts, where redox reaction processes occur. One of the most challenging problems is to develop an artificial photosynthetic solar fuel production system that is both highly efficient and stable. The assembly of cocatalysts on the semiconductor (light harvester) not only can facilitate the charge separation, but also can lower the activation energy or overpotential for the reactions. An efficient light harvester loaded with suitable reduction and oxidation cocatalysts is the key for high efficiency of artificial photosynthetic systems.
PHOTOSYNTHETIC REACTION CENTERS - Photobiology
It will be very interesting to see how light will influence the rate of photosynthesis in plants and what will happen if they do not get the required light in order to produce starch .
Phototrophic Bacteria - Wiki - Discover Biotech
I believe this will happen because when the light source is nearer to the plant more of the plants surface area is coming in to contact with the light from the desk lamp therefore more photosynthesis will occur which will mean more oxygen will be produced which will create more bubbles....
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