Congratulations to Natalia Ksenofontova, a Researcher at the Laboratory of Soil Carbon and Microbial Ecology, on the successful defense of her PhD thesis titled «Diversity and Ecological Functions of Metabolically Active Prokaryotic Communities in Soils Contaminated with Oil and Polycyclic Aromatic Hydrocarbons». The defense took place on December 13, 2022, at a meeting of the Dissertation Council of Lomonosov Moscow State University.