Literaturdatenbank
Literaturdatenbank |
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Mitrus, S. (1999). The calcareous layer eggshell of the turtle emys orbicularis (l.) – ultrastructure and composition. In Proceedings of the 2nd International Symposium on Emys orbicularis Vol. Chelonii 2, (pp. 46–48).Editions SOPTOM.
Added by: Sarina Wunderlich (24 May 2009 21:32:39 UTC) |
| Resource type: Book Article BibTeX citation key: Mitrus1999 View all bibliographic details  |
Categories: General Keywords: Emydidae, Emys, Emys orbicularis, Fortpflanzung = reproduction, Geoemydidae, Mauremys, Mauremys caspica, Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Mitrus Publisher: Editions SOPTOM Collection: Proceedings of the 2nd International Symposium on Emys orbicularis |
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Abstract: The calcareous layer of Emys orbicularis (L.) eggshell was examined by a scanning electron microscope with an energy dispersion spectrometer and by a diffractometer. The layer is composed of well distinguished shell units. Such unit consists of needle-like crystallites radiating outwards from the core. The linear structures of the cores visible on the inner surface appear to be similar to those in the eggshell of Mauremys caspica. Pores are rare. Structures similar to very small and rounded “pores” (depressions) on the outside surface of Testudinidae units eggshell were also found. There are differences in appearance of the inner surface between shell units of hatched eggs and of unfertilised eggs. In the former case there are flat, conical depressions and in the latter their surface is almost flat. This may suggest that the developing embryo derives calcium from the eggshell. The eggshell consists mostly of calcium carbonate in aragonite form. A small part of calcite form was also found. The analysis of dried eggshell showed the presence of about 38% (percent of weight) of calcium, 45% of oxygen, 13% of carbon and S, Na, P, Mg, K, Fe, Zn, Cl, Al, Cu, Si in traces.
Added by: Sarina Wunderlich |