Photosynthesis system

Of the photocatalytic systems and structures composed of a single active material, eventually coupled with redox catalysts and/or metals, only a wide band gap oxide semiconductor, like Pt/Ti02, requiring UV irradiation, showed some photoactivity for water photosplitting. Water splitting with visible light requires the irradiation of multiple band gap photoelectrochemical cells (PEC) or Z-scheme systems (like the photosynthesis system of plants etc.). 

Describe the principles of the use of Rufbpy) as a sensitiser in artificial photosynthesis systems. 

For more details regarding artificial photosynthesis systems, the reader is referred to Section 7.5. 

Figure 12.12 Building blocks of an artificial photosynthesis system for hydrogen production using a chromophore (C), an electron acceptor (A) and a sacrificial donor(D)...

Figure 2. Intensity of photosynthesis (A), transpiration (B) and stomata resistance (C) of Arabidopsis thaliana L. plants exposed to Cd, and Ph ions in hydroponics culture for 22 and 29 days. Measurements were made using IRGA method with Photosynthesis System LICOR 6200, Lincoln, Nebraska. Data are expressed as % of control SE, n=5.

In this chapter, we described some artificial photosynthesis systems that employ porphyrin metal complexes to photoinductively evolve hydrogen. Although further development is required, the photoinduced hydrogen evolution systems described in this chapter will likely be useful in the conversion of solar energy to chemical energy. 

Figure 6. Schematic representation of an artificial photosynthesis system. (Reproduced from reference 1. Copyright 1991 American Chemical Society.)...

AIST Japan has succeeded in using an artificial photosynthesis system to split water into hydrogen and oxygen under visible fight [133]. 

Amao Y. Solar fuel production based on the artificial photosynthesis system. ChemCat-... 

The findings of such peculiar phase patterns attracted considerable attention because they could not explained by the ordinary CIDEP theories (the TM, STo mixing, and ST i mixing). Buckley et al.[22] and Closs et al.[23] independently interpreted the these peculiar patterns in terms of spin-correlated radical pairs. It is noteworthy that ESR signals due to radical pairs were found to be directly observable in solution even at room temperature. Since then, CIDEP due to this spin-correlated mechanism (SCM) has often been obtained not only in micellar solutions but also in other confined systems such as in viscous solutions [24], in linked systems [25], and in bacterial photosynthesis systems [26]. 

Photosynthetic activities were measured using a portable photosynthesis system (LI-6400, LI-COR, Lincoln, NB, USA) according to the manufacturer s instructions. 

PUHs are generally absorbed through the roots of plants and transported via the transpiration system. The mode of action of PUHs seems to be due to the combined effects of the inhibition of photosynthesis and the irreversible injury of the plant photosynthesis system via inhibition of NADPHj. ... 

A cell that is rather closer in design to a natural photosynthesis system uses a dye to absorb the radiation. This type of cell uses titanium dioxide as the semiconductor that separates the charges. The dye is used as a more efficient photon absorber than... 

Main pigments of phototrophic bacteria of the orders Chlorobinea (green bacteria) and Rhodospirillinea (purple bacteria). B. a and b have the actual bacte-riochlorin skeleton while B. c-ehave the chlorin skeleton on which the chlorophylls of higher plants and cyanobacteria are based they are also very similar to chlorophylls in other respects. Elucidation of the detailed spatial constmction of the crystallized bacterial photosynthesis system from membranes of Rhodo-pseudomonas viridis was realized in 1984 by Deisen-hofer, Huber, and Michel by X-ray structural analysis for which they received the Nobel Prize for Chemistry in 1988. ... 

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