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A slime mould pigment as indicator of acidity


  1. 1.

    The yellow pigment of the slime-mouldPhysarum polycephalum is an acid-alkaline indicator with a color range from deep red orange to bright yellow green, and a corresponding pH range from 1 to above 8.

  2. 2.

    Within the slime-mould the pigment serves as an acid-alkaline indicator and shows the plasmodium to undergo changes ranging from pH 8 when fruiting to pH 1.6 (possibly 1.2) when a sclerotium is formed.

  3. 3.

    The suggestion is made that the yellow pigment of slime-moulds belongs to the group of respiratory ferments known as flavones, lyochromes, or flavins.

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  1. Bertho, A., Biological oxidations and reductions. Ann. Rev. Biochem.3, 23, 1934.

    Google Scholar 

  2. Ellinger, P. andW. Koschara, The lyochromes. Nature133, 553, 1934.

    Google Scholar 

  3. Everest, A. E., The anthocyan pigments. Science Progress9, 597, 1914–15.

    Google Scholar 

  4. Haas, P. and T. G.Hill, The Chemistry of Plant Products. London 1921.

  5. Howard, F. L., Laboratory cultivation of myxomycete plasmodia. Amer. J. Bot.18, 624, 1931.

    Google Scholar 

  6. Macbride, T. H. and G. W.Martin, Myxomycetes. New York 1934.

  7. Seifriz, W., The Effects of Acids and Alkalies on the Viscous and Structural Properties of Protoplasm. Physics 6 (in press) 1935.

  8. - and M.Russell, The fruiting of myxomycetes. Amer. J. Bot.22 (in press), 1935.

  9. Smith, E. P., The calibration of flower colour indicators. Protoplasma18, 112, 1933.

    Google Scholar 

  10. Svedberg, T. andI. B. Eriksson, Das Molekulargewicht des neuen Oxydations-fermentes. Naturwiss.21, 330, 1933.

    Google Scholar 

  11. Warburg, O. andW. Christian, Über ein neues Oxydationsferment und sein Absorptionsspektrum. Biochem. Z.254, 438, 1932.

    Google Scholar 

  12. — —, Über das gelbe Oxydationsferment. Biochem. Z.257, 492, 1933.

    Google Scholar 

  13. Willstätter, R. et al., Untersuchungen über die Kornblume. Liebigs Ann. Chem.401, 189, 1913;408, 1, 15, 42, 61, 83, 110, 122, 136, 147, 1915.

    Google Scholar 

  14. —, Synthese des Pelargonidins und Cyanidins. Ber. d. deutsch. chem. Gesellsch.57, 1938, 1924.

    Google Scholar 

  15. Zopf, W., Vorkommen von Fettfarbstoffen bei Pilzthieren. Flora72, 353, 1889.

    Google Scholar 

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Additional information

Part of this investigation was supported by a grant from the National Research council of Wasington, for which the authors are greatful. They are also thankful to Dr. F. L.Howard for supplyingthe original culture.

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Seifriz, W., Zetzmann, M. A slime mould pigment as indicator of acidity. Protoplasma 23, 175–179 (1935).

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  • Plasmodium
  • Flavone
  • Flavin
  • Yellow Pigment
  • Yellow Green