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Certain blue-green algae (Cyanophyceae) and photosynthetic bacteria (Thior hodaceae, Athiorhodaceae, and Chlorobacteriaceae) are unique in that they fix both STEWART CO2 and N2. This dual capacity is increasingly attracting the interests of physiolo gists and biochemists, so that even workers who thought primarily of isolated chloroplasts some years ago now often include these organisms in their studies. Ecologists are interested in their role in nitrogen-cycling, particularly in eutrophic waters and in nitrogen-poor environments. Morphologists are intrigued by the compartmentalization between carbon-fixing and N2-fixing sites, and agronomists have an interest in these organisms particularly in tropical agriculture. Such wide interests present problems in writing this review. Nevertheless there is a compensating, but in some respects unsatisfactory, feature, in that laboratory data are available for relatively few N2-fixing species. The organism of choice in about 80% of the laboratory studies on N2-fixation by blue-green algae (254, 255) is Anabaena cylindrica, an excellent physiological tool, but of little significance in nature. Data on N2-fixation are available for only a few strains of photosynthetic bacteria and we have had some problems even with these (103). Thus, much infor mation is available on a few organisms and despite the apparent morphological (218) and
Annual Review of Microbiology – Annual Reviews
Published: Oct 1, 1973
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