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Keeping equal the initial power drawn (0.27 W l -1 ) in shake flasks and in a stirred fermentor did not reproduce the behaviour of alginate production by Azotobacter vinelandii. A lower mean molecular weight (1.1x10 6 Da) of the polymer was obtained in the bioreactor as compared to that obtained in shake flasks (1.9x10 6 Da). The reasons for this can reside in the fact...
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