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. 1969 Feb;97(2):756–760. doi: 10.1128/jb.97.2.756-760.1969

Cytochrome and Ubiquinone Patterns During Growth of Azotobacter vinelandii

Christopher J Knowles a,1, Eric R Redfearn a,2
PMCID: PMC249756  PMID: 5773028

Abstract

After synthesis during the early log phase, the concentrations of ubiquinone and cytochromes did not vary during the growth cycle of Azotobacter vinelandii, when grown with either high or low aeration on nitrogen-free or urea-containing media. The level of aeration had no effect on the concentrations of the electron carriers synthesized, but affected the growth rate. On urea-containing medium, the concentration of cytochrome a2 was low, but it was synthesized at a linear rate when the bacteria were transferred to nitrogen-free medium. A. vinelandii was shown to utilize sufficient medium urea to account for all of the cell nitrogen. Growth on urea-containing medium with an oxygen atmosphere resulted in low growth yields, and cytochromes c4 + c5 were not synthesized; the concentrations of ubiquinone and cytochromes b1, a1, and a2 were only 12 to 18% of the values for growth on nitrogen-free medium with high aeration.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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