Summary As a first step in identifying the agents responsible for the mobilization of ferric iron by an aqueous extract of pine needles, the extract is divided into three fractions, an amino‐acid fraction, an organic‐acid fraction, and a neutral fraction. The principal constituents of the amino‐acid and organic‐acid fractions are then identified and their contents determined by means of paper and column chromatography.
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Muir et al. (1964) studied this question.
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