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Cadmium (Cd) can function as either a nutrient or toxin in the marine environment. This duality has been demonstrated in phytoplankton cultures where Cd has been shown to have toxic effects to cyanobacteria, but acts as a nutrient in the marine diatom Thalassiosira weissflogii by biochemically replacing zinc (Zn). In July of 2005, Cd bioavailability and uptake in the Costa Rica Upwelling Dome in the...
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