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Oxygen uptake rate in alginate producer (algU+) and nonproducer (algU−) strains of Azotobacter vinelandii under nitrogen‐fixation conditions

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The sigma E (AlgU) in Azotobacter vinelandii has been shown to control the expression of cydR gene, a repressor of genes of the alternative respiratory chain, and alginate has been… Click to show full abstract

The sigma E (AlgU) in Azotobacter vinelandii has been shown to control the expression of cydR gene, a repressor of genes of the alternative respiratory chain, and alginate has been considered a barrier for oxygen diffusion. Therefore, the aim of the present study was to compare the respiratory activity of an alginate nonproducing strain, lacking the sigma factor E (algU−), and polymer‐producing strains (algU+) of A. vinelandii under diazotrophic conditions at different aeration conditions.

Keywords: oxygen uptake; algu; rate alginate; uptake rate; azotobacter vinelandii

Journal Title: Journal of Applied Microbiology
Year Published: 2018

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