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Prior laboratory studies of Trichodesmium have shown a high iron requirement that is consistent with the biochemical demand for iron in the enzyme nitrogenase. Summer delivery of iron, in the form of Saharan dust, may provide an explanation for Trichodesmium blooms observed in offshore waters of the West Florida shelf over the last 50 yr. During ecology and(More)
This research tested the idea that a cognitive vulnerability to depression can be concealed by thought suppression and revealed when cognitive demands undermine mental control. Depressive, at-risk, and nondepressive participants unscrambled sentences that could from either positive or depressive statements. Half of the participants also received a cognitive(More)
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