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Quarterly Journal of Microscopical Science, Vol s3-100, 529-538, Copyright © 1959 by Company of Biologists

The Possible Calcification Mechanisms in some Reptilian Egg-shells

K. SIMKISS 1 and C. TYLER 1

1 Department of Physiological Chemistry, The University, Reading; Dept. of Zoology, Queen Mary College [University of London), Mile End Road, London, E. 1

Studies have been made of the organic matrix of certain reptilian egg-shells. The interaction between egg-shell-matrix and various metal ions has been considered by noting the effect of these ions on the staining of the matrix by toluidine blue. A comparison of the results with those for the hen indicates that the chelating mechanism in the Chelonia is similar to that in the hen, but that that in the Crocodilia is different. It is suggested that in the Crocodilia the acid mucopolysaccharide of the matrix is embedded in, but not combined with, the protein and that its chelating mechanism is carboxylate group to carboxylate group, while in the hen and Chelonia, the acid mucopolysaccharide is combined with the protein and that its chelating mechanism is carboxylate group to amino group.






© The Company of Biologists Ltd 1959