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- W2104320887 abstract "Na + -dependent strains of Azotobacter chroococcum were observed to have very low reactivities with the H 2 O 2 spot test for catalase. The cell extract of the representative Na + -dependent strain 184 contained a catalase specific activity that was 10-to 600-fold lower than those found in Na + -independent strains of A. chroococcum. Peroxidase and superoxide dismutase activities existed in all strains, although only certain Na + -dependent strains contained a peroxidase reactive with p -phenylenediamine. The activities of catalase and peroxidase in the Na + -dependent strain 184 were dependent on iron availability, which helped to explain the iron-dependent growth characteristic of this strain. The activities of these enzymes were not increased by subjecting the cells to increased aeration, nitrogen-fixing conditions, or paraquat. Strain 184 was found to be very sensitive to H 2 O 2 or paraquat, even under iron-sufficient conditions, and was difficult to recover quantitatively on solid plating media. Strain 184 was more susceptible to H 2 O 2 when grown under low-aeration, nitrogen-fixing conditions than when it was grown in the presence of NH 4 + . Low population densities of strain 184 grew in nitrogen-free medium under microaerophilic conditions, while more dense populations were able to fix nitrogen under aerobic conditions. Therefore, these bacteria appeared to be aeroadaptive, microaerophilic, nitrogen-fixing bacteria." @default.
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- W2104320887 date "1988-08-01" @default.
- W2104320887 modified "2023-09-27" @default.
- W2104320887 title "Sodium-Dependent Azotobacter chroococcum Strains Are Aeroadaptive, Microaerophilic, Nitrogen-Fixing Bacteria" @default.
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- W2104320887 doi "https://doi.org/10.1128/aem.54.8.2123-2128.1988" @default.
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