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The New Year is a busy time for pharmacies and peddlers of all health-related products. In the oceans, marine organisms rely on nutrients, too, but the source of their vitamins is sometimes mysterious...
Axenic cultures of the N2-fixing marine cyanobacteriumCrocosphaera watsoniiexhibit very high B12excretion rates (up to 40 times higher per cell), compared to the smaller non–N2-fixing strain of marine...
Within McMurdo Sound’s annual sea ice, assimilation and concentrations of vitamin B12 (cobalamin), microbial community productivity, and biomass were examined among three 100-m2 quadrats where light...
Primary production in the Ross Sea, one of the most productive areas in the Southern Ocean, has previously been shown to be seasonally limited by iron. In two of three bottle incubation experiments co...

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