Abstract
As is well known, antirachitic substances arise through irradiation with ultra-violet light. It might be presumed, therefore, that green plants, which are constantly exposed to the light of the sun, would become rich sources of the antirachitic vitamin. However, green plants, or parts thereof, have hitherto been found to be poor in the above-mentioned vitamin. This may, perhaps, be ascribed to the fact that the plant material has been prepared in an unsuitable manner prior to examination. It may also be, however, that the irradiation with sunlight has not been so intense as would have been supposed. As the summer of 1933 in southern Norway was unusually rich in sunny days (sunny days recorded in Oslo: May 25, June 28, July 30 and August 30) we considered it of interest to examine whether green plants this summer would show a larger vitamin D content than is usually the case.
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References
Poulsson and Løvenskiold, Biochem. J., 22, No. 1; 1928.
Kon, S. K., and Booth, R. G., Biochem. J., 27, 1189, 1302; 1933.
Zucker and Barnett, Proc. Soc. Exp. Biol. Med., 20, 375; 1922–23.
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RYGH, O. Occurrence of Antirachitic Vitamin in Green Plants. Nature 133, 255 (1934). https://doi.org/10.1038/133255a0
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DOI: https://doi.org/10.1038/133255a0
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