Claudia Frey

This study measures nitrogen and oxygen isotope effects during nitrate reduction in vitro and in natural lake water consortia, finding variations in isotope ratios linked to enzyme types and environmental factors.

The paper identifies non-canonical nitrous oxide production pathways in a lake through isotope analysis and incubation experiments, showing bacterial denitrification as dominant with contributions from chemo- and fungal denitrification.

The paper examines nitrogen dynamics in coastal waters with varying redox conditions, finding that long-term euxinia reduces ammonium removal by inhibiting nitrification.