Nikola Zlatkov Kolev; Department of Molecular Biology, defends his doctoral thesis Regulatory Mechanisms Involved in Pathoadaptation of ExPEC, Extraintestinal Pathogenic Escherichia coli. Faculty opponent: Eliora Ron, Professor, President of IUMS, School of Molecular Cell Biology & Biotechnology, Faculty of Life Sciences, Tel Aviv University, Israel. Principal supervisor: Professor Bernt Eric Uhlin.