The hydroxyl radical (OH) is the central oxidant of the lower atmosphere. OH is highly variable in space and time, but current observation-based methods cannot resolve local and regional OH gradients.

2016 was an eventful year for Africa and for the world, with important implications for U.S.-Africa relations. From continuing democratic consolidation and deepening trade ties in many countries to ...

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6. In Amendment No. 2, IEX proposed changes to its Form 1 to, among other things, redesign its outbound routing functionality to direct routable orders first to the IEX routing logic instead of ...