Abstract
1. With the use of radioactive iron it was found that the marine diatom Asterionella japonica utilized only particulate and/or colloidal iron as a growth nutrient, whereas ionically complexed ferric ion as the citrate, ascorbate, or artificial humate was not available for uptake.2. A minimal content of iron per cell needed for further division was established as 10 x 10-8 micromoles per liter. The ratio of the minimal iron to the minimal phosphate agrees substantially with the iron-to-phosphate ratio in natural plankton samples.
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