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Yueyue Si is a Postdoctoral Research Fellow in the Marine Biogeochemistry group at the University of Southampton. Her research focuses on biogeochemistry, particularly in microbial nitrogen cycling and the dynamics of natural sinks for climate gases such as nitrous oxide (N2O). She employs stable isotopes and geochemical measurements to explore microbial nitrogen cycling in subsurface serpentinizing systems, specifically within the Samail Ophiolite in Oman. Yueyue aims to characterize sources of nitrogen and understand the transformation processes that support organisms likely related to the emergence of early life on Earth. Her work also investigates the biological fixation of N2O in freshwater environments, examining temperature dependencies and the relationships with canonical N2 fixation processes. Currently, she is involved in a project funded by the Natural Environment Research Council (NERC) which focuses on nitrogen cycling in subsurface serpentinizing systems as an analogue for early life on Earth.