Letter | Published:

An Amphoteric Substance in the Radula of the Whelk (Buccinum undatum)

Naturevolume 115pages639640 (1925) | Download Citation



THE experiments of J. Loeb (“Proteins and the Theory of Colloidal Behavior”, New York, 1922) have shown that the iso-electric point of amphoteric substances is readily determined by staining them with basic or acidic ions or dyes at known hydrogen-ion concentrations. The method has since been applied for the determination of the iso-electric point of the mycelium of Rhizopus (Robbins, W. J., 1924, Journ. Gen. Physiol., 6, 259) and of bacteria (Steam, E. W., and Stearn, A. E., 1924, Journ. Bacteriol., 9, 463) by staining with dyes.

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  1. The Marine Biological Laboratory, The Hoe, Plymouth

    • C. F. A. PANTIN


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