This is because marine and terrestrial shell-forming molluscs have adapted to significantly different environments that would fundamentally affect both the process of shell formation, and the stability of the secreted composite biomineral; e.g. the abundance and biological availability of calcium, environmental pH, temperature, UV radiation, humidity and so on.
This study investigated the chemical composition, the organization and the in vitro osteoconductive potential of the terrestrial gastropod shell (Helix pomatia) on CAL72 and human osteoblast-like cells.
Victorians filled their cabinets with such curiosities birds, mammals, marine and terrestrial snail shells, and butterflies and painted tropical flowers and grew them in their hothouses.
In some cases, shell and terrestrial material from the same depth are available.
The rocks and fossils suggest alternating open-sea (the limestone and shales with marine shells) and terrestrial conditions (the coal).
a) Radiocarbon ages of terrestrial samples and mollusc shells from a sediment core from Kilen, Limfjorden, Denmark.
In this work we analysed the most frequent terrestrial and marine mollusk shells from the Usiminas shellmound, on Cabo Frio Island.
Indirubin and its analogs can be found in certain terrestrial plants and sea shells.
We test this here by attaching a plastic extension to the shells of terrestrial hermit crabs and assessing their ability to manoeuvre in confined spaces.
We model the liquid outer core of a terrestrial planet as a spherical shell (with inner and outer radii of r icb and r cmb, respectively) containing a viscous, incompressible, and electrically conducting fluid.
The semi-translucent exterior shell reintroduces the terrestrial concept of interior-to-exterior gradients, challenging common assumptions that extraterrestrial habitats require visually impenetrable barriers which divorce the interior from the surrounding terrain.
