![]() ![]() The primary processes of photosynthesis involve absorption of photons by light-harvesting complexes (LHs), transfer of excitation energy from LHs to the photosynthetic reaction centers (RCs), and the primary charge separation across the photosynthetic membrane (Sauer, 1975 Knox, 1977 Fleming & van Grondelle, 1994 van Grondelle et al. In spite of these differences, the general principles of energy transduction are the same in anoxygenic and oxygenic photosynthesis (Van Niel, 1931, 1941 Stanier, 1961 Wraight, 1982 Gest, 1993). Some photosynthetic bacteria, such as purple bacteria, carry out anoxygenic photosynthesis that involves oxidation of molecules other than water. Higher plants, algae and cyanobacteria perform oxygenic photosynthesis, which involves reduction of carbon dioxide to carbohydrate and oxidation of water to produce molecular oxygen. Otherwise, it is anoxygenic (Blankenship et al. ![]() When photosynthesis is carried out in the presence of air it is called oxygenic photosynthesis (Ort & Yocum, 1996). Historically, photosynthetic organisms are grouped into two classes. Life as we know it today exists largely because of photosynthesis, the process through which light energy is converted into chemical energy by plants, algae, and photosynthetic bacteria (Priestley, 1772 Barnes, 1893 Wurmser, 1925 Van Niel, 1941 Clayton & Sistrom, 1978 Blankenship et al. 2.4 Bacteriochlorophyll pairs in LH-II and the RC 13Ģ.5 Models of LH-I and the LH-I-RC complex 15ģ.2.2 Mechanisms of excitation transfer 32ģ.2.3 Approximation for long-range transfer 34ģ.3 Rates for transfer processes in the PSU 37ģ.3.1.1 Mechanism of Car→BChl transfer 39
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