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 …

Abstract The Paleoproterozoic (2.5–1.6 Ga) Era is a decisive time in Earth and life history.
The paleobiological record (microfossils, stromatolites, biomarkers and isotopes) illustrates …

Marine planktonic cyanobacteria contributed to the widespread oxygenation of the oceans
towards the end of the Pre-Cambrian and their evolutionary origin represents a key …

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 …

Nitrogen and sulfur are abundant constituents of plant and algal cells that are assimilated at
the lowest oxidation number, as NH 4+ and S 2−, although they can (in the case of sulfur …

Proterozoic sedimentary successions of India are important archives of both the tectonic
history of the Indian subcontinent and the geochemical evolution of Earth surface processes …

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 …

Earth's marine nitrogen cycle has co-evolved with life and redox conditions over geological
time. In this Review, we provide an account of nitrogen cycling in the world's oceans over the …

The sedimentary record of the Paleoproterozoic Aravalli Supergroup in northwest India
provides evidence for a progression from passive margin to active margin and back to …

Fixed nitrogen is an essential nutrient for eukaryotes. As N 2 fixation and assimilation of
nitrate are catalyzed by metalloenzymes, it has been hypothesized that in Mesoproterozoic …