We are highly interested in topics related to Microbial Ecology of pelagic and benthic marine as well as freshwater aquifer communities. Our research employs cutting-edge techniques (e.g. stable-isotope probing, Omics, Nanometer-scale Secondary Ion Mass Spectrometry) to identify microbial key-players within diverse microbial communities, to determine microbial activities and its limiting and stimulating factors, to unravel metabolic pathways, and to shed light on the fate of pollutants in the environment.