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The preferential uptake of selenite (Se(IV)) over selenate (Se(VI)) by the marine phytoplankters Chaetoceros calcitrans and Chlorella vulgaris was demonstrated. The Se(IV)/Se(VI) ratio in culture medium decreased 3-4 times as the algae grew. The addition of 3.2 nM Se(IV) to the medium was mostly removed by the algae, whereas the higher addition (∼6 nM) of Se(VI) remained constant during algal growth...
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