▪ Abstract Manganese (IV) oxides produced through microbial activity, ie, biogenic Mn
oxides or Mn biooxides, are believed to be the most abundant and highly reactive Mn oxide …

Mn (II)-oxidizing microbes have an integral role in the biogeochemical cycling of
manganese, iron, nitrogen, carbon, sulfur, and several nutrients and trace metals. There is …

Manganese (Mn) is an abundant element in terrestrial and coastal ecosystems and an
essential micronutrient in the metabolic processes of plants and animals. Mn is generally not …

Modern low-oxygen marine systems exhibit patterns of molybdenum–uranium covariation
that can be linked to specific attributes and processes of the depositional system, including …

Oceanic anoxia---including euxinic settings defined by the presence of water column
hydrogen sulfide (H~ 2~ S)---is minor in the ocean today. Such conditions, however, were …

Enrichments in reactive iron occur under euxinic marine conditions, that is, where dissolved
sulfide is present in the water column. These enrichments result primarily from the export of …

An abrupt transition from oxic to anoxic–sulfidic (euxinic) marine bottom waters occurred in
the Cariaco Basin in response to increasing productivity resulting from the late Pleistocene …

An Inceptisol A-horizon from Hawaii was subjected to a series of reduction-oxidation cycles—
14d cycle length over a 56d duration—across the “soil-Fe”[Fe (OH) 3. Fe2+ (aq), logKo …

Oxygenic photosynthesis is arguably the most important biological innovation in Earth's
history, facilitating the transition to a habitable planet for complex life. Dating the emergence …

Measurements of the N 2 produced by denitrification, a better understanding of non-
canonical pathways for N 2 production such as the anammox reaction, better appreciation of …