Scott D. Wankel

TL;DR: For example, the World Health Organization and U.S. Environmental Protection Agency have set a limit of 10 mg L nitrate (as N) for drinking water because nitrate poses a health risk, especially for children, who can contract methemoglobinemia (blue-baby syndrome) as mentioned in this paper.

TL;DR: The results suggest that large areas of the landscape potentially receive atmospheric NO(y) deposition inputs in excess of what one would infer from existing monitoring data alone, and spatial patterns in delta15N values are a valuable complement to existing tools for assessing relationships between NO3- deposition, regional emission inventories, and for evaluating progress toward NO(x) reduction goals.

TL;DR: It is proposed that the ability to use hydrogen as an energy source is widespread in hydrothermal vent symbioses, particularly at sites where hydrogen is abundant.

TL;DR: In this paper, the authors explore the reactivity of biogenic Mn oxides formed by a common marine bacterium (Roseobacter sp AzwK-3b), which has been previously shown to oxidize Mn(II) via the production of extracellular superoxide, resulting in the formation of highly reactive colloidal birnessite with hexagonal symmetry.

TL;DR: Sulfidization was a dominant pathway in iron reduction despite low sulfate concentrations and regardless of iron oxide substrate, indicating that sulfur (re)cycling is a dominant force in iron cycling even in low-sulfate systems and in a manner difficult to predict using the classical thermodynamic ladder.