Growth,photosynthesis, nitrogen fixation and carbohydrate production by a unicellular cyanobacterium,Synechococcus sp. (Cyanophyta) |
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Authors: | Edward J. Phlips Carolyn Zeman Phyllis Hansen |
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Affiliation: | 1. Department of Fisheries and Aquaculture, University of Florida, 7922 NW 71st Street, Gainesville, Florida, 32606, U.S.A.
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Abstract: | A polymer-producing strain of unicellular cyanobacteria, Synechococcus sp., was isolated from a coastal lagoon in Florida. This strain, designated BG0011, excreted a highly viscous polysaccharide. Maximum observed growth rates for BG0011 were 2.5 div. day-2. BG0011 also exhibited nitrogen fixation (nitrogenase) activity under aerobic conditions and grew at near maximum rates in medium lacking reduced nitrogen. Growth and carbohydrate production were enhanced by carbon dioxide enrichment. Rheological study of the extracellular polysaccharide revealed a viscosity versus shear rate curve similar in shape to that of xanthan gum. Maximum observed rate of carbohydrate production was 1 g dry weight liter-1 month-1. |
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Keywords: | cyanobacterium Synechococcus carbohydrate nitrogen fixation polymer |
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