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Results of the Csáky (A) and Arnow (B) tests used to identify hydroxamate-type and catechol-type siderophore activity, respectively, using cell-free culture supernatants of wild-type C. turicensis z3032 harboring pCTU1[P(+)] and its plasmid-cured derivative, 3032.2A [P(−)]. Cell-free culture supernatants of Vibrio vulnificus UNCC913 (C) and catechol (6 μg) were used as positive controls in the Csáky and Arnow tests, respectively.
