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A study on the effect of two of the main factors affecting energy flux in N 2 -fixing cyanobacteria, i.e. light intensity and availability of combined nitrogen, on the synthesis of soluble exopolysaccharides was carried out with three strains of the genus Nostoc (PCC 7413, PCC 7936, and PCC 8113) presenting different capsular polysaccharidic morphologies and released polysaccharide productions...
A two-stage culture system was established for the production of astaxanthin from Haematococcus pluvialis. In a first stage green vegetative cells were produced in semicontinuous cultures maintained with daily renewal rates between 10 and 40%. The steady-state cell density decreased with increasing renewal rates. Highest cell productivity, 64×10 6 cells l −1 day −1 was obtained...
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