Nitrogen is an essential nutrient for all life on Earth and it acts as a major control on
biological productivity in the modern ocean. Accurate reconstructions of the evolution of life …

BACKGROUND Marine ecosystems are composed of a diverse array of life forms, the
majority of which are unicellular—archaea, bacteria, and eukaryotes. The power of these …

Uncovers the Key Role Microbes Play in the Transformation of Oxidizable and Reducible
MineralsMany areas of geomicrobial processes are receiving serious attention from …

Nitrogen isotopes are an important tool for evaluating past biogeochemical cycling from the
paleoceanographic record. However, bulk sedimentary nitrogen isotope ratios, which can be …

The emergence and diversification of early animals is commonly thought to have coincided
with atmosphere and ocean oxygenation across the terminal Neoproterozoic and early …

The Cenomanian‐Turonian oceanic anoxic event (OAE2) is characterized by large
perturbations in the oxygen and sulfur cycles of the ocean, potentially resulting from …

Nitrogen isotope compositions in sedimentary rocks (d 15 N sed) are routinely used for
reconstructing Cenozoic N-biogeochemical cycling and are also being increasingly applied …

Biological nitrogen fixation constitutes the main input of fixed nitrogen to Earth's ecosystems,
and its isotope effect is a key parameter in isotope-based interpretations of the N cycle. The …

The late Ediacaran to early Cambrian interval witnessed extraordinary radiations of
metazoan life. The role of the physical environment in this biological revolution, such as …

The end of the Neoproterozoic Era (1000 to 541 Ma) is widely believed to have seen the
transition from a dominantly anoxic to an oxygenated deep ocean. This purported redox …