, Volume 23, Issue 1, pp 175–179

A slime mould pigment as indicator of acidity

  • William Seifriz
  • Marie Zetzmann


  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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Copyright information

© Verlag von Gebrüder Borntraeger 1935

Authors and Affiliations

  • William Seifriz
  • Marie Zetzmann

There are no affiliations available

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