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Regulation of the production of the two siderophores by iron. (A and C) Influence of FeSO4 (A) and 8-hydroxyquinoline (C) on the absorption spectra of filtered supernatants of 24-h MKB cultures of Pseudomonas sp. HYS. (B) Effects of FeSO4 on the production of pyoverdine (■) and NFS (□). (D) Effects of 8-hydroxyquinoline on the production of pyoverdine (■) and NFS (□). The error bars indicate standard deviations.
