Abstract
THE preparation of amino-acid copolymer labelled with sulphur-35 by thermal polymerization of hydrolysates of yeast (Torula utilis) incubated with 35SO4 has already been described by us1. The polymerization resulted in at least two different types of copolymers. One part of the preparation was absolutely insoluble in distilled water, while the other part could be dissolved in water. Both fractions showed protein-positive colour reactions and radioactivity.
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References
Krampitz, G., and Knappen, F., Nature, 195, 385 (1962).
Krampitz, G., Polyamino Acids, Polypeptides and Proteins, edit. by Stahmann, Mark A., 55 (Univ. Wisconsin Press, Madison, 1962).
Knappen, F., Landwirtschaftliche Forschung (in the press).
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KNAPPEN, F., KRAMPITZ, G. Distribution of Radioactive Sulphur after Oral Administration to the Rat of a Water-insoluble Fraction of Sulphur-35-labelled Thermal Amino-Acid Copolymer. Nature 197, 289–290 (1963). https://doi.org/10.1038/197289b0
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DOI: https://doi.org/10.1038/197289b0
