Microbiological study of the anaerobic corrosion of iron Dissertation zurErlangung des Grades einesDoktors der Naturwissenschaften- Dr. rer. nat.-dem Fachbereich Biologie/Chemie derUniversität Bremen vorgelegt vonDinh Thuy Hangaus HanoiBremen 2003Die Untersuchungen zur vorliegenden Doktorarbeit wurden am Max Planck Institut fürMarine Mikrobiologie in Bremen gurchgeführt.1. Gutachter: Prof. Dr. Friedrich Widdel, Universität Bremen2. Gutachter: Prof. Dr. Heribert Cypionka, Universität OldenburgTag des Promotionskolloquiums: 27. Juni 2003 To my parentsTable of contentAbbreviations1SummaryPart I. Biocorrosion of iron: an overview of the literature andresults of the present study4A Overview of the literature1. Introductory remarks on economic significance and principalreactions during corrosion 42. Aerobic microbial corrosion 63. Anaerobic microbial corrosion 73.1 Anaerobic corrosion by sulfate-reducing bacteria (SRB) 73.1.1 Physiology and phylogeny of SRB 83.1.2 Hydrogenases in SRB 103.1.3 Mechanism of corrosion mediated by SRB 123.2 Corrosion by anaerobic microorganisms other than SRB 173.2.1 Corrosion by methanogenic archaea 173.2.2 Corrosion by Fe(III)-reducing bacteria 183.2.3y nitrate-reducing bacteria 194. Goals of the present work 19B Results of the present study1. Anaerobic corrosion by sulfate-reducing bacteria (SRB) 221.1 Enrichment of SRB with metallic iron (Fe) as the only sourceof electrons 221.