A slime mould pigment as indicator of acidity
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.
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.
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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