... peptide synthetases: theemerging view from bacterial genomics. Nat Prod Rep24, 1073–1109.32 Umezawa H, Aoyagi T, Ogawa K, Obata T, Iinuma H,Naganawa H, Hamada M & Takeuchi T (1985) For- oxymithine, ... Marburg, GermanyIntroductionBacterial growth is strongly influenced by the availabil-ity of iron as an essential trace element employed as a cofactor [1]. The fact that the bioavailability of ... growth, 5 lCi of l-orni-thine (Hartmann Analytic, Braunschweig, Germany) wasadded. The supernatants were extracted with XAD16 resinafter an additional 2 days of growth. The dried eluate wasdissolved...