NITROGENOUS METABOLISM OF PYRUS MALUS L.: II. THE DISTRIBUTION OF NITROGEN IN THE INSOLUBLE CYTOPLASMIC PROTEINS

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Abstract
The constancy of distribution of N during the 3 physiologically significant periods, viz., the early periods, the period of active maximum growth, and the period of declining metabolism (chlorophyll degeneration), as deduced from the amino acid make-up of the insoluble cytoplasmic leaf proteins, shows that little (if any) qualitative change in the nature of the insoluble leaf proteins has taken place during development. The results indicate that there is a single protein, and not a mixture of several, in the leaves.

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