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1?��mol (h��)?m?2?s?1) and is able to exploit higher irradiances and a much greater range of irradiances (see Appendix: >50% maximum ETR from 80 to 910?��mol (h��)?m?2?s?1). It is worth noting, however, that rhodopseudomonad was killed by high irradiance. Oxygenic cyanobacteria and algae exhibiting photoinhibition are usually killed by high irradiances or severely photobleached [7, 14]. Many oxygenic algae are able to thrive under high irradiances although lengthy photoadaptation might be required for example Chlorella sp. and Dunaliella, but some other algae such as Phaeodactylum do not seem to be able to adjust well to living under high irradiances [12-14]. This does not seem to be the case in Afifella and Rhodopseudomonas. Rhodopseudomonads are also highly motile and will swim to avoid unfavorable light conditions in suspension and in mats [29, 32, 71]. http://www.selleckchem.com/products/sch772984.html Afifella cells in culture bottles conspicuously swim away from a light source. Attempting to obtain useful productivity from a pond of Afifella is impractical because of its very low irradiance optimum, but a Rhodopseudomonas palustris pondage is a much more practicable proposition (Figs.?7-11 and Table?2). The light saturation characteristics of Rhodopseudomonas have important consequences for photosynthesis by rhodopseudomonad cells in a pondage. Figure?8 shows ETR of Rhodopseudomonas (calculated on a per unit volume basis) in a pond from 0 to 30?cm depth calculated using Eq.?(4a) (see Appendix) with the sun directly overhead (��2343?��mol (h��)?m?2?s?1, 350�C700?nm). Photosynthesis is negligible at the surface, but becomes significant at a depth of 2?cm. http://www.selleckchem.com/products/dabrafenib-gsk2118436.html The optimum depth is at 8.08?��?0.33?cm. Integrating photosynthesis over the depth of the pond shows that a 30-cm-deep pond of Rhodopseudomonas would be capable of an ETR of about 335?��mol (e?)?m?2?s?1. This is impressive as it represents a light capture and utilization value of about 15% of incident 350�C700?nm irradiance. There is almost nothing to gain from a pond of greater depth because it would increase the http://www.selleck.cn/products/z-vad-fmk.html burden of metabolizing cells with negligible access to light. The depth of the pond could be decreased to 20?cm and there would only be a loss of 5.5% in photosynthesis, but would decrease the biomass of the system by 33%. A similar analysis of production in an Afifella pondage gives much more disappointing results. Afifella saturates at very low irradiances (