Photosynthesis environmental effects

Photopolymerizable coatings relief-image-forming systems, 6,125 Photoreactivity environmental effects, 1, 394 Photoredox properties bipyridyl metal complexes, 2, 90 Photoresist systems, 6,125 Photosensitive materials, 6, 113 Photosynthesis anoxygenic, 6, 589 magnesium and manganese, 6, 588 water decomposition models, 6, 498... 

Jones, RJ. and O. Hoegh-Guldberg. 1999. Effects of cyanide on coral photosynthesis implications for identifying the cause of coral bleaching and for assessing the environmental effects of cyanide fishing. Mar. Ecol. Prog. Ser. 177 83-91. 

Davidson, I. R. (1991). Environmental effects on algal photosynthesis Temperamre. J. Phycol 21, 2-8. 

Lerman,J.C. How to interpret variations in the carbon isotope ratio of plants biologic and environmental effects. In Environmental and Biological Control of Photosynthesis. Mar-celle,R. (ed.), pp. 323-336. The Hague Dr. W. Junk b.v. Publishers 1975 Lerman, J.C., Deleens,E., Nato, A., Moyse,A. Variation in the carbon isotope composition of a plant with Crassulacean Acid Metabolism. Plant Physiol. 53,581-584 (1974)... 

The possible effects of increased atmospheric CO2 on photosynthesis are reviewed by Goud-riaan and Ajtay (1979) and Rosenberg (1981). Increasing CO2 in a controlled environment (i.e., greenhouse) increases the assimilation rate of some plants, however, the anthropogenic fertilization of the atmosphere with CO2 is probably unable to induce much of this effect since most plants in natural ecosystems are growth limited by other environmental factors, notably light, temperature, water, and nutrients. 

Isotopic variation in European human remains is caused by a combination of environmental, biological and cultural factors. For carbon, the main influence is the dominance of C3 photosynthesis in all vegetation types. The factors that can cause deviations from this general trend are the climatic effect,... 

Algae have the ability to directly utilize sunlight and carbon dioxide for photosynthesis. Due to this activity, cyanobacteria may help to solve a global environmental problem, the greenhouse effect, which increasingly threatens mankind at the beginning of the 21st century. 

However, unlike photosynthesis in green plants, the titanium oxide photocatalyst in itself does not allow the use of visible light and can make use of only 3-4% of solar beams that reach the earth. Therefore, to address such enormous tasks, photocatalytic systems which are able to operate effectively and efficiently not only under UV but also under the most environmentally ideal energy source, sunlight, must be established. To this end, it is vital to design and develop unique titanium oxide photocatalysts which can absorb and operate with high efficiency under solar and/or visible light irradiation.3 4 ... 

The response of denitrification to certain environmental factors varies according to how strongly the process is coupled to nitrification. An increase in O2 penetration into sediments can stimulate coupled nitrification-denitrification by enhancing NOj" availability (Rysgaard et al., 1994), but simultaneously depress water column-supported denitrification because of the increased distance that NOj" must diffuse to reach the anaerobic layer (Cornwell et al., 1999). Risgaard-Petersen et al. (1994) reported that a photosynthesis-induced increase in O2 penetration into an estuarine sediment doubled the coupled nitrification-denitrification rate, but reduced the amount of water column-supported denitrification by 50%. Because the contribution of coupled nitrification-denitrification to total denitrification at this site was small (—16%), the net effect of deeper O2 penetration was to reduce... 

Photoelectrochemical (PEC) reduction of CO2 with a p-type semiconductor electrode can be regarded as one of the solar energy conversion technologies and is important from a view-point of the global environmental problems. The reaction proceeds by essentially the same mechanism as photosynthesis and is of much interest as an artificial model for it. A number of studies have been made [1], but the photovoltage or the solar-to-chemical energy conversion efficiency still remains relatively low. We reported [2-4] that a p-Si electrode modified with small metal (Cu, Au and Ag) particles worked as an ideal-type electrode for the PEC reduction of CO2 in aqueous solutions. In the present paper we will report that the electrode of this type is also effective for the PEC reduction of CO2 in non-aqueous solutions which have high CO2 solubility. 

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